drivers/android/binder.c

   1 /* binder.c
   2  *
   3  * Android IPC Subsystem
   4  *
   5  * Copyright (C) 2007-2008 Google, Inc.
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  19
  20 #include <asm/cacheflush.h>
  21 #include <linux/fdtable.h>
  22 #include <linux/file.h>
  23 #include <linux/freezer.h>
  24 #include <linux/fs.h>
  25 #include <linux/list.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/mm.h>
  28 #include <linux/module.h>
  29 #include <linux/mutex.h>
  30 #include <linux/nsproxy.h>
  31 #include <linux/poll.h>
  32 #include <linux/debugfs.h>
  33 #include <linux/rbtree.h>
  34 #include <linux/sched.h>
  35 #include <linux/seq_file.h>
  36 #include <linux/uaccess.h>
  37 #include <linux/vmalloc.h>
  38 #include <linux/slab.h>
  39 #include <linux/pid_namespace.h>
  40 #include <linux/security.h>
  41
  42 #ifdef CONFIG_ANDROID_BINDER_IPC_32BIT
  43 #define BINDER_IPC_32BIT 1
  44 #endif
  45
  46 #include <uapi/linux/android/binder.h>
  47 #include "binder_trace.h"
  48
  49 static DEFINE_MUTEX(binder_main_lock);
  50 static DEFINE_MUTEX(binder_deferred_lock);
  51 static DEFINE_MUTEX(binder_mmap_lock);
  52
  53 static HLIST_HEAD(binder_devices);
  54 static HLIST_HEAD(binder_procs);
  55 static HLIST_HEAD(binder_deferred_list);
  56 static HLIST_HEAD(binder_dead_nodes);
  57
  58 static struct dentry *binder_debugfs_dir_entry_root;
  59 static struct dentry *binder_debugfs_dir_entry_proc;
  60 static int binder_last_id;
  61 static struct workqueue_struct *binder_deferred_workqueue;
  62
  63 #define BINDER_DEBUG_ENTRY(name) \
  64 static int binder_##name##_open(struct inode *inode, struct file *file) \
  65 { \
  66         return single_open(file, binder_##name##_show, inode->i_private); \
  67 } \
  68 \
  69 static const struct file_operations binder_##name##_fops = { \
  70         .owner = THIS_MODULE, \
  71         .open = binder_##name##_open, \
  72         .read = seq_read, \
  73         .llseek = seq_lseek, \
  74         .release = single_release, \
  75 }
  76
  77 static int binder_proc_show(struct seq_file *m, void *unused);
  78 BINDER_DEBUG_ENTRY(proc);
  79
  80 /* This is only defined in include/asm-arm/sizes.h */
  81 #ifndef SZ_1K
  82 #define SZ_1K                               0x400
  83 #endif
  84
  85 #ifndef SZ_4M
  86 #define SZ_4M                               0x400000
  87 #endif
  88
  89 #define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
  90
  91 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
  92
  93 enum {
  94         BINDER_DEBUG_USER_ERROR             = 1U << 0,
  95         BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
  96         BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
  97         BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
  98         BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
  99         BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
 100         BINDER_DEBUG_READ_WRITE             = 1U << 6,
 101         BINDER_DEBUG_USER_REFS              = 1U << 7,
 102         BINDER_DEBUG_THREADS                = 1U << 8,
 103         BINDER_DEBUG_TRANSACTION            = 1U << 9,
 104         BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
 105         BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
 106         BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
 107         BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
 108         BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
 109         BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
 110 };
 111 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
 112         BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
 113 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO);
 114
 115 static bool binder_debug_no_lock;
 116 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO);
 117
 118 static char *binder_devices_param = CONFIG_ANDROID_BINDER_DEVICES;
 119 module_param_named(devices, binder_devices_param, charp, S_IRUGO);
 120
 121 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
 122 static int binder_stop_on_user_error;
 123
 124 static int binder_set_stop_on_user_error(const char *val,
 125                                          struct kernel_param *kp)
 126 {
 127         int ret;
 128
 129         ret = param_set_int(val, kp);
 130         if (binder_stop_on_user_error < 2)
 131                 wake_up(&binder_user_error_wait);
 132         return ret;
 133 }
 134 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
 135         param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
 136
 137 #define binder_debug(mask, x...) \
 138         do { \
 139                 if (binder_debug_mask & mask) \
 140                         pr_info(x); \
 141         } while (0)
 142
 143 #define binder_user_error(x...) \
 144         do { \
 145                 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) \
 146                         pr_info(x); \
 147                 if (binder_stop_on_user_error) \
 148                         binder_stop_on_user_error = 2; \
 149         } while (0)
 150
 151 #define to_flat_binder_object(hdr) \
 152         container_of(hdr, struct flat_binder_object, hdr)
 153
 154 #define to_binder_fd_object(hdr) container_of(hdr, struct binder_fd_object, hdr)
 155
 156 #define to_binder_buffer_object(hdr) \
 157         container_of(hdr, struct binder_buffer_object, hdr)
 158
 159 #define to_binder_fd_array_object(hdr) \
 160         container_of(hdr, struct binder_fd_array_object, hdr)
 161
 162 enum binder_stat_types {
 163         BINDER_STAT_PROC,
 164         BINDER_STAT_THREAD,
 165         BINDER_STAT_NODE,
 166         BINDER_STAT_REF,
 167         BINDER_STAT_DEATH,
 168         BINDER_STAT_TRANSACTION,
 169         BINDER_STAT_TRANSACTION_COMPLETE,
 170         BINDER_STAT_COUNT
 171 };
 172
 173 struct binder_stats {
 174         int br[_IOC_NR(BR_FAILED_REPLY) + 1];
 175         int bc[_IOC_NR(BC_REPLY_SG) + 1];
 176         int obj_created[BINDER_STAT_COUNT];
 177         int obj_deleted[BINDER_STAT_COUNT];
 178 };
 179
 180 static struct binder_stats binder_stats;
 181
 182 static inline void binder_stats_deleted(enum binder_stat_types type)
 183 {
 184         binder_stats.obj_deleted[type]++;
 185 }
 186
 187 static inline void binder_stats_created(enum binder_stat_types type)
 188 {
 189         binder_stats.obj_created[type]++;
 190 }
 191
 192 struct binder_transaction_log_entry {
 193         int debug_id;
 194         int call_type;
 195         int from_proc;
 196         int from_thread;
 197         int target_handle;
 198         int to_proc;
 199         int to_thread;
 200         int to_node;
 201         int data_size;
 202         int offsets_size;
 203         const char *context_name;
 204 };
 205 struct binder_transaction_log {
 206         int next;
 207         int full;
 208         struct binder_transaction_log_entry entry[32];
 209 };
 210 static struct binder_transaction_log binder_transaction_log;
 211 static struct binder_transaction_log binder_transaction_log_failed;
 212
 213 static struct binder_transaction_log_entry *binder_transaction_log_add(
 214         struct binder_transaction_log *log)
 215 {
 216         struct binder_transaction_log_entry *e;
 217
 218         e = &log->entry[log->next];
 219         memset(e, 0, sizeof(*e));
 220         log->next++;
 221         if (log->next == ARRAY_SIZE(log->entry)) {
 222                 log->next = 0;
 223                 log->full = 1;
 224         }
 225         return e;
 226 }
 227
 228 struct binder_context {
 229         struct binder_node *binder_context_mgr_node;
 230         kuid_t binder_context_mgr_uid;
 231         const char *name;
 232 };
 233
 234 struct binder_device {
 235         struct hlist_node hlist;
 236         struct miscdevice miscdev;
 237         struct binder_context context;
 238 };
 239
 240 struct binder_work {
 241         struct list_head entry;
 242         enum {
 243                 BINDER_WORK_TRANSACTION = 1,
 244                 BINDER_WORK_TRANSACTION_COMPLETE,
 245                 BINDER_WORK_NODE,
 246                 BINDER_WORK_DEAD_BINDER,
 247                 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
 248                 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
 249         } type;
 250 };
 251
 252 struct binder_node {
 253         int debug_id;
 254         struct binder_work work;
 255         union {
 256                 struct rb_node rb_node;
 257                 struct hlist_node dead_node;
 258         };
 259         struct binder_proc *proc;
 260         struct hlist_head refs;
 261         int internal_strong_refs;
 262         int local_weak_refs;
 263         int local_strong_refs;
 264         binder_uintptr_t ptr;
 265         binder_uintptr_t cookie;
 266         unsigned has_strong_ref:1;
 267         unsigned pending_strong_ref:1;
 268         unsigned has_weak_ref:1;
 269         unsigned pending_weak_ref:1;
 270         unsigned has_async_transaction:1;
 271         unsigned accept_fds:1;
 272         unsigned min_priority:8;
 273         struct list_head async_todo;
 274 };
 275
 276 struct binder_ref_death {
 277         struct binder_work work;
 278         binder_uintptr_t cookie;
 279 };
 280
 281 struct binder_ref {
 282         /* Lookups needed: */
 283         /*   node + proc => ref (transaction) */
 284         /*   desc + proc => ref (transaction, inc/dec ref) */
 285         /*   node => refs + procs (proc exit) */
 286         int debug_id;
 287         struct rb_node rb_node_desc;
 288         struct rb_node rb_node_node;
 289         struct hlist_node node_entry;
 290         struct binder_proc *proc;
 291         struct binder_node *node;
 292         uint32_t desc;
 293         int strong;
 294         int weak;
 295         struct binder_ref_death *death;
 296 };
 297
 298 struct binder_buffer {
 299         struct list_head entry; /* free and allocated entries by address */
 300         struct rb_node rb_node; /* free entry by size or allocated entry */
 301                                 /* by address */
 302         unsigned free:1;
 303         unsigned allow_user_free:1;
 304         unsigned async_transaction:1;
 305         unsigned debug_id:29;
 306
 307         struct binder_transaction *transaction;
 308
 309         struct binder_node *target_node;
 310         size_t data_size;
 311         size_t offsets_size;
 312         size_t extra_buffers_size;
 313         uint8_t data[0];
 314 };
 315
 316 enum binder_deferred_state {
 317         BINDER_DEFERRED_PUT_FILES    = 0x01,
 318         BINDER_DEFERRED_FLUSH        = 0x02,
 319         BINDER_DEFERRED_RELEASE      = 0x04,
 320 };
 321
 322 struct binder_proc {
 323         struct hlist_node proc_node;
 324         struct rb_root threads;
 325         struct rb_root nodes;
 326         struct rb_root refs_by_desc;
 327         struct rb_root refs_by_node;
 328         int pid;
 329         struct vm_area_struct *vma;
 330         struct mm_struct *vma_vm_mm;
 331         struct task_struct *tsk;
 332         struct files_struct *files;
 333         struct hlist_node deferred_work_node;
 334         int deferred_work;
 335         void *buffer;
 336         ptrdiff_t user_buffer_offset;
 337
 338         struct list_head buffers;
 339         struct rb_root free_buffers;
 340         struct rb_root allocated_buffers;
 341         size_t free_async_space;
 342
 343         struct page **pages;
 344         size_t buffer_size;
 345         uint32_t buffer_free;
 346         struct list_head todo;
 347         wait_queue_head_t wait;
 348         struct binder_stats stats;
 349         struct list_head delivered_death;
 350         int max_threads;
 351         int requested_threads;
 352         int requested_threads_started;
 353         int ready_threads;
 354         long default_priority;
 355         struct dentry *debugfs_entry;
 356         struct binder_context *context;
 357 };
 358
 359 enum {
 360         BINDER_LOOPER_STATE_REGISTERED  = 0x01,
 361         BINDER_LOOPER_STATE_ENTERED     = 0x02,
 362         BINDER_LOOPER_STATE_EXITED      = 0x04,
 363         BINDER_LOOPER_STATE_INVALID     = 0x08,
 364         BINDER_LOOPER_STATE_WAITING     = 0x10,
 365         BINDER_LOOPER_STATE_NEED_RETURN = 0x20
 366 };
 367
 368 struct binder_thread {
 369         struct binder_proc *proc;
 370         struct rb_node rb_node;
 371         int pid;
 372         int looper;
 373         struct binder_transaction *transaction_stack;
 374         struct list_head todo;
 375         uint32_t return_error; /* Write failed, return error code in read buf */
 376         uint32_t return_error2; /* Write failed, return error code in read */
 377                 /* buffer. Used when sending a reply to a dead process that */
 378                 /* we are also waiting on */
 379         wait_queue_head_t wait;
 380         struct binder_stats stats;
 381 };
 382
 383 struct binder_transaction {
 384         int debug_id;
 385         struct binder_work work;
 386         struct binder_thread *from;
 387         struct binder_transaction *from_parent;
 388         struct binder_proc *to_proc;
 389         struct binder_thread *to_thread;
 390         struct binder_transaction *to_parent;
 391         unsigned need_reply:1;
 392         /* unsigned is_dead:1; */       /* not used at the moment */
 393
 394         struct binder_buffer *buffer;
 395         unsigned int    code;
 396         unsigned int    flags;
 397         long    priority;
 398         long    saved_priority;
 399         kuid_t  sender_euid;
 400 };
 401
 402 static void
 403 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer);
 404
 405 static int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
 406 {
 407         struct files_struct *files = proc->files;
 408         unsigned long rlim_cur;
 409         unsigned long irqs;
 410
 411         if (files == NULL)
 412                 return -ESRCH;
 413
 414         if (!lock_task_sighand(proc->tsk, &irqs))
 415                 return -EMFILE;
 416
 417         rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE);
 418         unlock_task_sighand(proc->tsk, &irqs);
 419
 420         return __alloc_fd(files, 0, rlim_cur, flags);
 421 }
 422
 423 /*
 424  * copied from fd_install
 425  */
 426 static void task_fd_install(
 427         struct binder_proc *proc, unsigned int fd, struct file *file)
 428 {
 429         if (proc->files)
 430                 __fd_install(proc->files, fd, file);
 431 }
 432
 433 /*
 434  * copied from sys_close
 435  */
 436 static long task_close_fd(struct binder_proc *proc, unsigned int fd)
 437 {
 438         int retval;
 439
 440         if (proc->files == NULL)
 441                 return -ESRCH;
 442
 443         retval = __close_fd(proc->files, fd);
 444         /* can't restart close syscall because file table entry was cleared */
 445         if (unlikely(retval == -ERESTARTSYS ||
 446                      retval == -ERESTARTNOINTR ||
 447                      retval == -ERESTARTNOHAND ||
 448                      retval == -ERESTART_RESTARTBLOCK))
 449                 retval = -EINTR;
 450
 451         return retval;
 452 }
 453
 454 static inline void binder_lock(const char *tag)
 455 {
 456         trace_binder_lock(tag);
 457         mutex_lock(&binder_main_lock);
 458         trace_binder_locked(tag);
 459 }
 460
 461 static inline void binder_unlock(const char *tag)
 462 {
 463         trace_binder_unlock(tag);
 464         mutex_unlock(&binder_main_lock);
 465 }
 466
 467 static void binder_set_nice(long nice)
 468 {
 469         long min_nice;
 470
 471         if (can_nice(current, nice)) {
 472                 set_user_nice(current, nice);
 473                 return;
 474         }
 475         min_nice = rlimit_to_nice(current->signal->rlim[RLIMIT_NICE].rlim_cur);
 476         binder_debug(BINDER_DEBUG_PRIORITY_CAP,
 477                      "%d: nice value %ld not allowed use %ld instead\n",
 478                       current->pid, nice, min_nice);
 479         set_user_nice(current, min_nice);
 480         if (min_nice <= MAX_NICE)
 481                 return;
 482         binder_user_error("%d RLIMIT_NICE not set\n", current->pid);
 483 }
 484
 485 static size_t binder_buffer_size(struct binder_proc *proc,
 486                                  struct binder_buffer *buffer)
 487 {
 488         if (list_is_last(&buffer->entry, &proc->buffers))
 489                 return proc->buffer + proc->buffer_size - (void *)buffer->data;
 490         return (size_t)list_entry(buffer->entry.next,
 491                           struct binder_buffer, entry) - (size_t)buffer->data;
 492 }
 493
 494 static void binder_insert_free_buffer(struct binder_proc *proc,
 495                                       struct binder_buffer *new_buffer)
 496 {
 497         struct rb_node **p = &proc->free_buffers.rb_node;
 498         struct rb_node *parent = NULL;
 499         struct binder_buffer *buffer;
 500         size_t buffer_size;
 501         size_t new_buffer_size;
 502
 503         BUG_ON(!new_buffer->free);
 504
 505         new_buffer_size = binder_buffer_size(proc, new_buffer);
 506
 507         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 508                      "%d: add free buffer, size %zd, at %p\n",
 509                       proc->pid, new_buffer_size, new_buffer);
 510
 511         while (*p) {
 512                 parent = *p;
 513                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 514                 BUG_ON(!buffer->free);
 515
 516                 buffer_size = binder_buffer_size(proc, buffer);
 517
 518                 if (new_buffer_size < buffer_size)
 519                         p = &parent->rb_left;
 520                 else
 521                         p = &parent->rb_right;
 522         }
 523         rb_link_node(&new_buffer->rb_node, parent, p);
 524         rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
 525 }
 526
 527 static void binder_insert_allocated_buffer(struct binder_proc *proc,
 528                                            struct binder_buffer *new_buffer)
 529 {
 530         struct rb_node **p = &proc->allocated_buffers.rb_node;
 531         struct rb_node *parent = NULL;
 532         struct binder_buffer *buffer;
 533
 534         BUG_ON(new_buffer->free);
 535
 536         while (*p) {
 537                 parent = *p;
 538                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
 539                 BUG_ON(buffer->free);
 540
 541                 if (new_buffer < buffer)
 542                         p = &parent->rb_left;
 543                 else if (new_buffer > buffer)
 544                         p = &parent->rb_right;
 545                 else
 546                         BUG();
 547         }
 548         rb_link_node(&new_buffer->rb_node, parent, p);
 549         rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
 550 }
 551
 552 static struct binder_buffer *binder_buffer_lookup(struct binder_proc *proc,
 553                                                   uintptr_t user_ptr)
 554 {
 555         struct rb_node *n = proc->allocated_buffers.rb_node;
 556         struct binder_buffer *buffer;
 557         struct binder_buffer *kern_ptr;
 558
 559         kern_ptr = (struct binder_buffer *)(user_ptr - proc->user_buffer_offset
 560                 - offsetof(struct binder_buffer, data));
 561
 562         while (n) {
 563                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 564                 BUG_ON(buffer->free);
 565
 566                 if (kern_ptr < buffer)
 567                         n = n->rb_left;
 568                 else if (kern_ptr > buffer)
 569                         n = n->rb_right;
 570                 else
 571                         return buffer;
 572         }
 573         return NULL;
 574 }
 575
 576 static int binder_update_page_range(struct binder_proc *proc, int allocate,
 577                                     void *start, void *end,
 578                                     struct vm_area_struct *vma)
 579 {
 580         void *page_addr;
 581         unsigned long user_page_addr;
 582         struct page **page;
 583         struct mm_struct *mm;
 584
 585         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 586                      "%d: %s pages %p-%p\n", proc->pid,
 587                      allocate ? "allocate" : "free", start, end);
 588
 589         if (end <= start)
 590                 return 0;
 591
 592         trace_binder_update_page_range(proc, allocate, start, end);
 593
 594         if (vma)
 595                 mm = NULL;
 596         else
 597                 mm = get_task_mm(proc->tsk);
 598
 599         if (mm) {
 600                 down_write(&mm->mmap_sem);
 601                 vma = proc->vma;
 602                 if (vma && mm != proc->vma_vm_mm) {
 603                         pr_err("%d: vma mm and task mm mismatch\n",
 604                                 proc->pid);
 605                         vma = NULL;
 606                 }
 607         }
 608
 609         if (allocate == 0)
 610                 goto free_range;
 611
 612         if (vma == NULL) {
 613                 pr_err("%d: binder_alloc_buf failed to map pages in userspace, no vma\n",
 614                         proc->pid);
 615                 goto err_no_vma;
 616         }
 617
 618         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
 619                 int ret;
 620
 621                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 622
 623                 BUG_ON(*page);
 624                 *page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
 625                 if (*page == NULL) {
 626                         pr_err("%d: binder_alloc_buf failed for page at %p\n",
 627                                 proc->pid, page_addr);
 628                         goto err_alloc_page_failed;
 629                 }
 630                 ret = map_kernel_range_noflush((unsigned long)page_addr,
 631                                         PAGE_SIZE, PAGE_KERNEL, page);
 632                 flush_cache_vmap((unsigned long)page_addr,
 633                                 (unsigned long)page_addr + PAGE_SIZE);
 634                 if (ret != 1) {
 635                         pr_err("%d: binder_alloc_buf failed to map page at %p in kernel\n",
 636                                proc->pid, page_addr);
 637                         goto err_map_kernel_failed;
 638                 }
 639                 user_page_addr =
 640                         (uintptr_t)page_addr + proc->user_buffer_offset;
 641                 ret = vm_insert_page(vma, user_page_addr, page[0]);
 642                 if (ret) {
 643                         pr_err("%d: binder_alloc_buf failed to map page at %lx in userspace\n",
 644                                proc->pid, user_page_addr);
 645                         goto err_vm_insert_page_failed;
 646                 }
 647                 /* vm_insert_page does not seem to increment the refcount */
 648         }
 649         if (mm) {
 650                 up_write(&mm->mmap_sem);
 651                 mmput(mm);
 652         }
 653         return 0;
 654
 655 free_range:
 656         for (page_addr = end - PAGE_SIZE; page_addr >= start;
 657              page_addr -= PAGE_SIZE) {
 658                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 659                 if (vma)
 660                         zap_page_range(vma, (uintptr_t)page_addr +
 661                                 proc->user_buffer_offset, PAGE_SIZE, NULL);
 662 err_vm_insert_page_failed:
 663                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 664 err_map_kernel_failed:
 665                 __free_page(*page);
 666                 *page = NULL;
 667 err_alloc_page_failed:
 668                 ;
 669         }
 670 err_no_vma:
 671         if (mm) {
 672                 up_write(&mm->mmap_sem);
 673                 mmput(mm);
 674         }
 675         return -ENOMEM;
 676 }
 677
 678 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
 679                                               size_t data_size,
 680                                               size_t offsets_size,
 681                                               size_t extra_buffers_size,
 682                                               int is_async)
 683 {
 684         struct rb_node *n = proc->free_buffers.rb_node;
 685         struct binder_buffer *buffer;
 686         size_t buffer_size;
 687         struct rb_node *best_fit = NULL;
 688         void *has_page_addr;
 689         void *end_page_addr;
 690         size_t size, data_offsets_size;
 691
 692         if (proc->vma == NULL) {
 693                 pr_err("%d: binder_alloc_buf, no vma\n",
 694                        proc->pid);
 695                 return NULL;
 696         }
 697
 698         data_offsets_size = ALIGN(data_size, sizeof(void *)) +
 699                 ALIGN(offsets_size, sizeof(void *));
 700
 701         if (data_offsets_size < data_size || data_offsets_size < offsets_size) {
 702                 binder_user_error("%d: got transaction with invalid size %zd-%zd\n",
 703                                 proc->pid, data_size, offsets_size);
 704                 return NULL;
 705         }
 706         size = data_offsets_size + ALIGN(extra_buffers_size, sizeof(void *));
 707         if (size < data_offsets_size || size < extra_buffers_size) {
 708                 binder_user_error("%d: got transaction with invalid extra_buffers_size %zd\n",
 709                                   proc->pid, extra_buffers_size);
 710                 return NULL;
 711         }
 712         if (is_async &&
 713             proc->free_async_space < size + sizeof(struct binder_buffer)) {
 714                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 715                              "%d: binder_alloc_buf size %zd failed, no async space left\n",
 716                               proc->pid, size);
 717                 return NULL;
 718         }
 719
 720         while (n) {
 721                 buffer = rb_entry(n, struct binder_buffer, rb_node);
 722                 BUG_ON(!buffer->free);
 723                 buffer_size = binder_buffer_size(proc, buffer);
 724
 725                 if (size < buffer_size) {
 726                         best_fit = n;
 727                         n = n->rb_left;
 728                 } else if (size > buffer_size)
 729                         n = n->rb_right;
 730                 else {
 731                         best_fit = n;
 732                         break;
 733                 }
 734         }
 735         if (best_fit == NULL) {
 736                 pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
 737                         proc->pid, size);
 738                 return NULL;
 739         }
 740         if (n == NULL) {
 741                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
 742                 buffer_size = binder_buffer_size(proc, buffer);
 743         }
 744
 745         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 746                      "%d: binder_alloc_buf size %zd got buffer %p size %zd\n",
 747                       proc->pid, size, buffer, buffer_size);
 748
 749         has_page_addr =
 750                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK);
 751         if (n == NULL) {
 752                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
 753                         buffer_size = size; /* no room for other buffers */
 754                 else
 755                         buffer_size = size + sizeof(struct binder_buffer);
 756         }
 757         end_page_addr =
 758                 (void *)PAGE_ALIGN((uintptr_t)buffer->data + buffer_size);
 759         if (end_page_addr > has_page_addr)
 760                 end_page_addr = has_page_addr;
 761         if (binder_update_page_range(proc, 1,
 762             (void *)PAGE_ALIGN((uintptr_t)buffer->data), end_page_addr, NULL))
 763                 return NULL;
 764
 765         rb_erase(best_fit, &proc->free_buffers);
 766         buffer->free = 0;
 767         binder_insert_allocated_buffer(proc, buffer);
 768         if (buffer_size != size) {
 769                 struct binder_buffer *new_buffer = (void *)buffer->data + size;
 770
 771                 list_add(&new_buffer->entry, &buffer->entry);
 772                 new_buffer->free = 1;
 773                 binder_insert_free_buffer(proc, new_buffer);
 774         }
 775         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 776                      "%d: binder_alloc_buf size %zd got %p\n",
 777                       proc->pid, size, buffer);
 778         buffer->data_size = data_size;
 779         buffer->offsets_size = offsets_size;
 780         buffer->extra_buffers_size = extra_buffers_size;
 781         buffer->async_transaction = is_async;
 782         if (is_async) {
 783                 proc->free_async_space -= size + sizeof(struct binder_buffer);
 784                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 785                              "%d: binder_alloc_buf size %zd async free %zd\n",
 786                               proc->pid, size, proc->free_async_space);
 787         }
 788
 789         return buffer;
 790 }
 791
 792 static void *buffer_start_page(struct binder_buffer *buffer)
 793 {
 794         return (void *)((uintptr_t)buffer & PAGE_MASK);
 795 }
 796
 797 static void *buffer_end_page(struct binder_buffer *buffer)
 798 {
 799         return (void *)(((uintptr_t)(buffer + 1) - 1) & PAGE_MASK);
 800 }
 801
 802 static void binder_delete_free_buffer(struct binder_proc *proc,
 803                                       struct binder_buffer *buffer)
 804 {
 805         struct binder_buffer *prev, *next = NULL;
 806         int free_page_end = 1;
 807         int free_page_start = 1;
 808
 809         BUG_ON(proc->buffers.next == &buffer->entry);
 810         prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
 811         BUG_ON(!prev->free);
 812         if (buffer_end_page(prev) == buffer_start_page(buffer)) {
 813                 free_page_start = 0;
 814                 if (buffer_end_page(prev) == buffer_end_page(buffer))
 815                         free_page_end = 0;
 816                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 817                              "%d: merge free, buffer %p share page with %p\n",
 818                               proc->pid, buffer, prev);
 819         }
 820
 821         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 822                 next = list_entry(buffer->entry.next,
 823                                   struct binder_buffer, entry);
 824                 if (buffer_start_page(next) == buffer_end_page(buffer)) {
 825                         free_page_end = 0;
 826                         if (buffer_start_page(next) ==
 827                             buffer_start_page(buffer))
 828                                 free_page_start = 0;
 829                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 830                                      "%d: merge free, buffer %p share page with %p\n",
 831                                       proc->pid, buffer, prev);
 832                 }
 833         }
 834         list_del(&buffer->entry);
 835         if (free_page_start || free_page_end) {
 836                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 837                              "%d: merge free, buffer %p do not share page%s%s with %p or %p\n",
 838                              proc->pid, buffer, free_page_start ? "" : " end",
 839                              free_page_end ? "" : " start", prev, next);
 840                 binder_update_page_range(proc, 0, free_page_start ?
 841                         buffer_start_page(buffer) : buffer_end_page(buffer),
 842                         (free_page_end ? buffer_end_page(buffer) :
 843                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
 844         }
 845 }
 846
 847 static void binder_free_buf(struct binder_proc *proc,
 848                             struct binder_buffer *buffer)
 849 {
 850         size_t size, buffer_size;
 851
 852         buffer_size = binder_buffer_size(proc, buffer);
 853
 854         size = ALIGN(buffer->data_size, sizeof(void *)) +
 855                 ALIGN(buffer->offsets_size, sizeof(void *)) +
 856                 ALIGN(buffer->extra_buffers_size, sizeof(void *));
 857
 858         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
 859                      "%d: binder_free_buf %p size %zd buffer_size %zd\n",
 860                       proc->pid, buffer, size, buffer_size);
 861
 862         BUG_ON(buffer->free);
 863         BUG_ON(size > buffer_size);
 864         BUG_ON(buffer->transaction != NULL);
 865         BUG_ON((void *)buffer < proc->buffer);
 866         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 867
 868         if (buffer->async_transaction) {
 869                 proc->free_async_space += size + sizeof(struct binder_buffer);
 870
 871                 binder_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
 872                              "%d: binder_free_buf size %zd async free %zd\n",
 873                               proc->pid, size, proc->free_async_space);
 874         }
 875
 876         binder_update_page_range(proc, 0,
 877                 (void *)PAGE_ALIGN((uintptr_t)buffer->data),
 878                 (void *)(((uintptr_t)buffer->data + buffer_size) & PAGE_MASK),
 879                 NULL);
 880         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
 881         buffer->free = 1;
 882         if (!list_is_last(&buffer->entry, &proc->buffers)) {
 883                 struct binder_buffer *next = list_entry(buffer->entry.next,
 884                                                 struct binder_buffer, entry);
 885
 886                 if (next->free) {
 887                         rb_erase(&next->rb_node, &proc->free_buffers);
 888                         binder_delete_free_buffer(proc, next);
 889                 }
 890         }
 891         if (proc->buffers.next != &buffer->entry) {
 892                 struct binder_buffer *prev = list_entry(buffer->entry.prev,
 893                                                 struct binder_buffer, entry);
 894
 895                 if (prev->free) {
 896                         binder_delete_free_buffer(proc, buffer);
 897                         rb_erase(&prev->rb_node, &proc->free_buffers);
 898                         buffer = prev;
 899                 }
 900         }
 901         binder_insert_free_buffer(proc, buffer);
 902 }
 903
 904 static struct binder_node *binder_get_node(struct binder_proc *proc,
 905                                            binder_uintptr_t ptr)
 906 {
 907         struct rb_node *n = proc->nodes.rb_node;
 908         struct binder_node *node;
 909
 910         while (n) {
 911                 node = rb_entry(n, struct binder_node, rb_node);
 912
 913                 if (ptr < node->ptr)
 914                         n = n->rb_left;
 915                 else if (ptr > node->ptr)
 916                         n = n->rb_right;
 917                 else
 918                         return node;
 919         }
 920         return NULL;
 921 }
 922
 923 static struct binder_node *binder_new_node(struct binder_proc *proc,
 924                                            binder_uintptr_t ptr,
 925                                            binder_uintptr_t cookie)
 926 {
 927         struct rb_node **p = &proc->nodes.rb_node;
 928         struct rb_node *parent = NULL;
 929         struct binder_node *node;
 930
 931         while (*p) {
 932                 parent = *p;
 933                 node = rb_entry(parent, struct binder_node, rb_node);
 934
 935                 if (ptr < node->ptr)
 936                         p = &(*p)->rb_left;
 937                 else if (ptr > node->ptr)
 938                         p = &(*p)->rb_right;
 939                 else
 940                         return NULL;
 941         }
 942
 943         node = kzalloc(sizeof(*node), GFP_KERNEL);
 944         if (node == NULL)
 945                 return NULL;
 946         binder_stats_created(BINDER_STAT_NODE);
 947         rb_link_node(&node->rb_node, parent, p);
 948         rb_insert_color(&node->rb_node, &proc->nodes);
 949         node->debug_id = ++binder_last_id;
 950         node->proc = proc;
 951         node->ptr = ptr;
 952         node->cookie = cookie;
 953         node->work.type = BINDER_WORK_NODE;
 954         INIT_LIST_HEAD(&node->work.entry);
 955         INIT_LIST_HEAD(&node->async_todo);
 956         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
 957                      "%d:%d node %d u%016llx c%016llx created\n",
 958                      proc->pid, current->pid, node->debug_id,
 959                      (u64)node->ptr, (u64)node->cookie);
 960         return node;
 961 }
 962
 963 static int binder_inc_node(struct binder_node *node, int strong, int internal,
 964                            struct list_head *target_list)
 965 {
 966         if (strong) {
 967                 if (internal) {
 968                         if (target_list == NULL &&
 969                             node->internal_strong_refs == 0 &&
 970                             !(node->proc &&
 971                               node == node->proc->context->
 972                                       binder_context_mgr_node &&
 973                               node->has_strong_ref)) {
 974                                 pr_err("invalid inc strong node for %d\n",
 975                                         node->debug_id);
 976                                 return -EINVAL;
 977                         }
 978                         node->internal_strong_refs++;
 979                 } else
 980                         node->local_strong_refs++;
 981                 if (!node->has_strong_ref && target_list) {
 982                         list_del_init(&node->work.entry);
 983                         list_add_tail(&node->work.entry, target_list);
 984                 }
 985         } else {
 986                 if (!internal)
 987                         node->local_weak_refs++;
 988                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
 989                         if (target_list == NULL) {
 990                                 pr_err("invalid inc weak node for %d\n",
 991                                         node->debug_id);
 992                                 return -EINVAL;
 993                         }
 994                         list_add_tail(&node->work.entry, target_list);
 995                 }
 996         }
 997         return 0;
 998 }
 999
1000 static int binder_dec_node(struct binder_node *node, int strong, int internal)
1001 {
1002         if (strong) {
1003                 if (internal)
1004                         node->internal_strong_refs--;
1005                 else
1006                         node->local_strong_refs--;
1007                 if (node->local_strong_refs || node->internal_strong_refs)
1008                         return 0;
1009         } else {
1010                 if (!internal)
1011                         node->local_weak_refs--;
1012                 if (node->local_weak_refs || !hlist_empty(&node->refs))
1013                         return 0;
1014         }
1015         if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
1016                 if (list_empty(&node->work.entry)) {
1017                         list_add_tail(&node->work.entry, &node->proc->todo);
1018                         wake_up_interruptible(&node->proc->wait);
1019                 }
1020         } else {
1021                 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
1022                     !node->local_weak_refs) {
1023                         list_del_init(&node->work.entry);
1024                         if (node->proc) {
1025                                 rb_erase(&node->rb_node, &node->proc->nodes);
1026                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1027                                              "refless node %d deleted\n",
1028                                              node->debug_id);
1029                         } else {
1030                                 hlist_del(&node->dead_node);
1031                                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1032                                              "dead node %d deleted\n",
1033                                              node->debug_id);
1034                         }
1035                         kfree(node);
1036                         binder_stats_deleted(BINDER_STAT_NODE);
1037                 }
1038         }
1039
1040         return 0;
1041 }
1042
1043
1044 static struct binder_ref *binder_get_ref(struct binder_proc *proc,
1045                                          u32 desc, bool need_strong_ref)
1046 {
1047         struct rb_node *n = proc->refs_by_desc.rb_node;
1048         struct binder_ref *ref;
1049
1050         while (n) {
1051                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1052
1053                 if (desc < ref->desc) {
1054                         n = n->rb_left;
1055                 } else if (desc > ref->desc) {
1056                         n = n->rb_right;
1057                 } else if (need_strong_ref && !ref->strong) {
1058                         binder_user_error("tried to use weak ref as strong ref\n");
1059                         return NULL;
1060                 } else {
1061                         return ref;
1062                 }
1063         }
1064         return NULL;
1065 }
1066
1067 static struct binder_ref *binder_get_ref_for_node(struct binder_proc *proc,
1068                                                   struct binder_node *node)
1069 {
1070         struct rb_node *n;
1071         struct rb_node **p = &proc->refs_by_node.rb_node;
1072         struct rb_node *parent = NULL;
1073         struct binder_ref *ref, *new_ref;
1074         struct binder_context *context = proc->context;
1075
1076         while (*p) {
1077                 parent = *p;
1078                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
1079
1080                 if (node < ref->node)
1081                         p = &(*p)->rb_left;
1082                 else if (node > ref->node)
1083                         p = &(*p)->rb_right;
1084                 else
1085                         return ref;
1086         }
1087         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
1088         if (new_ref == NULL)
1089                 return NULL;
1090         binder_stats_created(BINDER_STAT_REF);
1091         new_ref->debug_id = ++binder_last_id;
1092         new_ref->proc = proc;
1093         new_ref->node = node;
1094         rb_link_node(&new_ref->rb_node_node, parent, p);
1095         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
1096
1097         new_ref->desc = (node == context->binder_context_mgr_node) ? 0 : 1;
1098         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
1099                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
1100                 if (ref->desc > new_ref->desc)
1101                         break;
1102                 new_ref->desc = ref->desc + 1;
1103         }
1104
1105         p = &proc->refs_by_desc.rb_node;
1106         while (*p) {
1107                 parent = *p;
1108                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
1109
1110                 if (new_ref->desc < ref->desc)
1111                         p = &(*p)->rb_left;
1112                 else if (new_ref->desc > ref->desc)
1113                         p = &(*p)->rb_right;
1114                 else
1115                         BUG();
1116         }
1117         rb_link_node(&new_ref->rb_node_desc, parent, p);
1118         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
1119         if (node) {
1120                 hlist_add_head(&new_ref->node_entry, &node->refs);
1121
1122                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1123                              "%d new ref %d desc %d for node %d\n",
1124                               proc->pid, new_ref->debug_id, new_ref->desc,
1125                               node->debug_id);
1126         } else {
1127                 binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1128                              "%d new ref %d desc %d for dead node\n",
1129                               proc->pid, new_ref->debug_id, new_ref->desc);
1130         }
1131         return new_ref;
1132 }
1133
1134 static void binder_delete_ref(struct binder_ref *ref)
1135 {
1136         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
1137                      "%d delete ref %d desc %d for node %d\n",
1138                       ref->proc->pid, ref->debug_id, ref->desc,
1139                       ref->node->debug_id);
1140
1141         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
1142         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
1143         if (ref->strong)
1144                 binder_dec_node(ref->node, 1, 1);
1145         hlist_del(&ref->node_entry);
1146         binder_dec_node(ref->node, 0, 1);
1147         if (ref->death) {
1148                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1149                              "%d delete ref %d desc %d has death notification\n",
1150                               ref->proc->pid, ref->debug_id, ref->desc);
1151                 list_del(&ref->death->work.entry);
1152                 kfree(ref->death);
1153                 binder_stats_deleted(BINDER_STAT_DEATH);
1154         }
1155         kfree(ref);
1156         binder_stats_deleted(BINDER_STAT_REF);
1157 }
1158
1159 static int binder_inc_ref(struct binder_ref *ref, int strong,
1160                           struct list_head *target_list)
1161 {
1162         int ret;
1163
1164         if (strong) {
1165                 if (ref->strong == 0) {
1166                         ret = binder_inc_node(ref->node, 1, 1, target_list);
1167                         if (ret)
1168                                 return ret;
1169                 }
1170                 ref->strong++;
1171         } else {
1172                 if (ref->weak == 0) {
1173                         ret = binder_inc_node(ref->node, 0, 1, target_list);
1174                         if (ret)
1175                                 return ret;
1176                 }
1177                 ref->weak++;
1178         }
1179         return 0;
1180 }
1181
1182
1183 static int binder_dec_ref(struct binder_ref *ref, int strong)
1184 {
1185         if (strong) {
1186                 if (ref->strong == 0) {
1187                         binder_user_error("%d invalid dec strong, ref %d desc %d s %d w %d\n",
1188                                           ref->proc->pid, ref->debug_id,
1189                                           ref->desc, ref->strong, ref->weak);
1190                         return -EINVAL;
1191                 }
1192                 ref->strong--;
1193                 if (ref->strong == 0) {
1194                         int ret;
1195
1196                         ret = binder_dec_node(ref->node, strong, 1);
1197                         if (ret)
1198                                 return ret;
1199                 }
1200         } else {
1201                 if (ref->weak == 0) {
1202                         binder_user_error("%d invalid dec weak, ref %d desc %d s %d w %d\n",
1203                                           ref->proc->pid, ref->debug_id,
1204                                           ref->desc, ref->strong, ref->weak);
1205                         return -EINVAL;
1206                 }
1207                 ref->weak--;
1208         }
1209         if (ref->strong == 0 && ref->weak == 0)
1210                 binder_delete_ref(ref);
1211         return 0;
1212 }
1213
1214 static void binder_pop_transaction(struct binder_thread *target_thread,
1215                                    struct binder_transaction *t)
1216 {
1217         if (target_thread) {
1218                 BUG_ON(target_thread->transaction_stack != t);
1219                 BUG_ON(target_thread->transaction_stack->from != target_thread);
1220                 target_thread->transaction_stack =
1221                         target_thread->transaction_stack->from_parent;
1222                 t->from = NULL;
1223         }
1224         t->need_reply = 0;
1225         if (t->buffer)
1226                 t->buffer->transaction = NULL;
1227         kfree(t);
1228         binder_stats_deleted(BINDER_STAT_TRANSACTION);
1229 }
1230
1231 static void binder_send_failed_reply(struct binder_transaction *t,
1232                                      uint32_t error_code)
1233 {
1234         struct binder_thread *target_thread;
1235         struct binder_transaction *next;
1236
1237         BUG_ON(t->flags & TF_ONE_WAY);
1238         while (1) {
1239                 target_thread = t->from;
1240                 if (target_thread) {
1241                         if (target_thread->return_error != BR_OK &&
1242                            target_thread->return_error2 == BR_OK) {
1243                                 target_thread->return_error2 =
1244                                         target_thread->return_error;
1245                                 target_thread->return_error = BR_OK;
1246                         }
1247                         if (target_thread->return_error == BR_OK) {
1248                                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1249                                              "send failed reply for transaction %d to %d:%d\n",
1250                                               t->debug_id,
1251                                               target_thread->proc->pid,
1252                                               target_thread->pid);
1253
1254                                 binder_pop_transaction(target_thread, t);
1255                                 target_thread->return_error = error_code;
1256                                 wake_up_interruptible(&target_thread->wait);
1257                         } else {
1258                                 pr_err("reply failed, target thread, %d:%d, has error code %d already\n",
1259                                         target_thread->proc->pid,
1260                                         target_thread->pid,
1261                                         target_thread->return_error);
1262                         }
1263                         return;
1264                 }
1265                 next = t->from_parent;
1266
1267                 binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
1268                              "send failed reply for transaction %d, target dead\n",
1269                              t->debug_id);
1270
1271                 binder_pop_transaction(target_thread, t);
1272                 if (next == NULL) {
1273                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
1274                                      "reply failed, no target thread at root\n");
1275                         return;
1276                 }
1277                 t = next;
1278                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
1279                              "reply failed, no target thread -- retry %d\n",
1280                               t->debug_id);
1281         }
1282 }
1283
1284 /**
1285  * binder_validate_object() - checks for a valid metadata object in a buffer.
1286  * @buffer:     binder_buffer that we're parsing.
1287  * @offset:     offset in the buffer at which to validate an object.
1288  *
1289  * Return:      If there's a valid metadata object at @offset in @buffer, the
1290  *              size of that object. Otherwise, it returns zero.
1291  */
1292 static size_t binder_validate_object(struct binder_buffer *buffer, u64 offset)
1293 {
1294         /* Check if we can read a header first */
1295         struct binder_object_header *hdr;
1296         size_t object_size = 0;
1297
1298         if (offset > buffer->data_size - sizeof(*hdr) ||
1299             buffer->data_size < sizeof(*hdr) ||
1300             !IS_ALIGNED(offset, sizeof(u32)))
1301                 return 0;
1302
1303         /* Ok, now see if we can read a complete object. */
1304         hdr = (struct binder_object_header *)(buffer->data + offset);
1305         switch (hdr->type) {
1306         case BINDER_TYPE_BINDER:
1307         case BINDER_TYPE_WEAK_BINDER:
1308         case BINDER_TYPE_HANDLE:
1309         case BINDER_TYPE_WEAK_HANDLE:
1310                 object_size = sizeof(struct flat_binder_object);
1311                 break;
1312         case BINDER_TYPE_FD:
1313                 object_size = sizeof(struct binder_fd_object);
1314                 break;
1315         case BINDER_TYPE_PTR:
1316                 object_size = sizeof(struct binder_buffer_object);
1317                 break;
1318         case BINDER_TYPE_FDA:
1319                 object_size = sizeof(struct binder_fd_array_object);
1320                 break;
1321         default:
1322                 return 0;
1323         }
1324         if (offset <= buffer->data_size - object_size &&
1325             buffer->data_size >= object_size)
1326                 return object_size;
1327         else
1328                 return 0;
1329 }
1330
1331 /**
1332  * binder_validate_ptr() - validates binder_buffer_object in a binder_buffer.
1333  * @b:          binder_buffer containing the object
1334  * @index:      index in offset array at which the binder_buffer_object is
1335  *              located
1336  * @start:      points to the start of the offset array
1337  * @num_valid:  the number of valid offsets in the offset array
1338  *
1339  * Return:      If @index is within the valid range of the offset array
1340  *              described by @start and @num_valid, and if there's a valid
1341  *              binder_buffer_object at the offset found in index @index
1342  *              of the offset array, that object is returned. Otherwise,
1343  *              %NULL is returned.
1344  *              Note that the offset found in index @index itself is not
1345  *              verified; this function assumes that @num_valid elements
1346  *              from @start were previously verified to have valid offsets.
1347  */
1348 static struct binder_buffer_object *binder_validate_ptr(struct binder_buffer *b,
1349                                                         binder_size_t index,
1350                                                         binder_size_t *start,
1351                                                         binder_size_t num_valid)
1352 {
1353         struct binder_buffer_object *buffer_obj;
1354         binder_size_t *offp;
1355
1356         if (index >= num_valid)
1357                 return NULL;
1358
1359         offp = start + index;
1360         buffer_obj = (struct binder_buffer_object *)(b->data + *offp);
1361         if (buffer_obj->hdr.type != BINDER_TYPE_PTR)
1362                 return NULL;
1363
1364         return buffer_obj;
1365 }
1366
1367 /**
1368  * binder_validate_fixup() - validates pointer/fd fixups happen in order.
1369  * @b:                  transaction buffer
1370  * @objects_start       start of objects buffer
1371  * @buffer:             binder_buffer_object in which to fix up
1372  * @offset:             start offset in @buffer to fix up
1373  * @last_obj:           last binder_buffer_object that we fixed up in
1374  * @last_min_offset:    minimum fixup offset in @last_obj
1375  *
1376  * Return:              %true if a fixup in buffer @buffer at offset @offset is
1377  *                      allowed.
1378  *
1379  * For safety reasons, we only allow fixups inside a buffer to happen
1380  * at increasing offsets; additionally, we only allow fixup on the last
1381  * buffer object that was verified, or one of its parents.
1382  *
1383  * Example of what is allowed:
1384  *
1385  * A
1386  *   B (parent = A, offset = 0)
1387  *   C (parent = A, offset = 16)
1388  *     D (parent = C, offset = 0)
1389  *   E (parent = A, offset = 32) // min_offset is 16 (C.parent_offset)
1390  *
1391  * Examples of what is not allowed:
1392  *
1393  * Decreasing offsets within the same parent:
1394  * A
1395  *   C (parent = A, offset = 16)
1396  *   B (parent = A, offset = 0) // decreasing offset within A
1397  *
1398  * Referring to a parent that wasn't the last object or any of its parents:
1399  * A
1400  *   B (parent = A, offset = 0)
1401  *   C (parent = A, offset = 0)
1402  *   C (parent = A, offset = 16)
1403  *     D (parent = B, offset = 0) // B is not A or any of A's parents
1404  */
1405 static bool binder_validate_fixup(struct binder_buffer *b,
1406                                   binder_size_t *objects_start,
1407                                   struct binder_buffer_object *buffer,
1408                                   binder_size_t fixup_offset,
1409                                   struct binder_buffer_object *last_obj,
1410                                   binder_size_t last_min_offset)
1411 {
1412         if (!last_obj) {
1413                 /* Nothing to fix up in */
1414                 return false;
1415         }
1416
1417         while (last_obj != buffer) {
1418                 /*
1419                  * Safe to retrieve the parent of last_obj, since it
1420                  * was already previously verified by the driver.
1421                  */
1422                 if ((last_obj->flags & BINDER_BUFFER_FLAG_HAS_PARENT) == 0)
1423                         return false;
1424                 last_min_offset = last_obj->parent_offset + sizeof(uintptr_t);
1425                 last_obj = (struct binder_buffer_object *)
1426                         (b->data + *(objects_start + last_obj->parent));
1427         }
1428         return (fixup_offset >= last_min_offset);
1429 }
1430
1431 static void binder_transaction_buffer_release(struct binder_proc *proc,
1432                                               struct binder_buffer *buffer,
1433                                               binder_size_t *failed_at)
1434 {
1435         binder_size_t *offp, *off_start, *off_end;
1436         int debug_id = buffer->debug_id;
1437
1438         binder_debug(BINDER_DEBUG_TRANSACTION,
1439                      "%d buffer release %d, size %zd-%zd, failed at %p\n",
1440                      proc->pid, buffer->debug_id,
1441                      buffer->data_size, buffer->offsets_size, failed_at);
1442
1443         if (buffer->target_node)
1444                 binder_dec_node(buffer->target_node, 1, 0);
1445
1446         off_start = (binder_size_t *)(buffer->data +
1447                                       ALIGN(buffer->data_size, sizeof(void *)));
1448         if (failed_at)
1449                 off_end = failed_at;
1450         else
1451                 off_end = (void *)off_start + buffer->offsets_size;
1452         for (offp = off_start; offp < off_end; offp++) {
1453                 struct binder_object_header *hdr;
1454                 size_t object_size = binder_validate_object(buffer, *offp);
1455
1456                 if (object_size == 0) {
1457                         pr_err("transaction release %d bad object at offset %lld, size %zd\n",
1458                                debug_id, (u64)*offp, buffer->data_size);
1459                         continue;
1460                 }
1461                 hdr = (struct binder_object_header *)(buffer->data + *offp);
1462                 switch (hdr->type) {
1463                 case BINDER_TYPE_BINDER:
1464                 case BINDER_TYPE_WEAK_BINDER: {
1465                         struct flat_binder_object *fp;
1466                         struct binder_node *node;
1467
1468                         fp = to_flat_binder_object(hdr);
1469                         node = binder_get_node(proc, fp->binder);
1470                         if (node == NULL) {
1471                                 pr_err("transaction release %d bad node %016llx\n",
1472                                        debug_id, (u64)fp->binder);
1473                                 break;
1474                         }
1475                         binder_debug(BINDER_DEBUG_TRANSACTION,
1476                                      "        node %d u%016llx\n",
1477                                      node->debug_id, (u64)node->ptr);
1478                         binder_dec_node(node, hdr->type == BINDER_TYPE_BINDER,
1479                                         0);
1480                 } break;
1481                 case BINDER_TYPE_HANDLE:
1482                 case BINDER_TYPE_WEAK_HANDLE: {
1483                         struct flat_binder_object *fp;
1484                         struct binder_ref *ref;
1485
1486                         fp = to_flat_binder_object(hdr);
1487                         ref = binder_get_ref(proc, fp->handle,
1488                                              hdr->type == BINDER_TYPE_HANDLE);
1489
1490                         if (ref == NULL) {
1491                                 pr_err("transaction release %d bad handle %d\n",
1492                                  debug_id, fp->handle);
1493                                 break;
1494                         }
1495                         binder_debug(BINDER_DEBUG_TRANSACTION,
1496                                      "        ref %d desc %d (node %d)\n",
1497                                      ref->debug_id, ref->desc, ref->node->debug_id);
1498                         binder_dec_ref(ref, hdr->type == BINDER_TYPE_HANDLE);
1499                 } break;
1500
1501                 case BINDER_TYPE_FD: {
1502                         struct binder_fd_object *fp = to_binder_fd_object(hdr);
1503
1504                         binder_debug(BINDER_DEBUG_TRANSACTION,
1505                                      "        fd %d\n", fp->fd);
1506                         if (failed_at)
1507                                 task_close_fd(proc, fp->fd);
1508                 } break;
1509                 case BINDER_TYPE_PTR:
1510                         /*
1511                          * Nothing to do here, this will get cleaned up when the
1512                          * transaction buffer gets freed
1513                          */
1514                         break;
1515                 case BINDER_TYPE_FDA: {
1516                         struct binder_fd_array_object *fda;
1517                         struct binder_buffer_object *parent;
1518                         uintptr_t parent_buffer;
1519                         u32 *fd_array;
1520                         size_t fd_index;
1521                         binder_size_t fd_buf_size;
1522
1523                         fda = to_binder_fd_array_object(hdr);
1524                         parent = binder_validate_ptr(buffer, fda->parent,
1525                                                      off_start,
1526                                                      offp - off_start);
1527                         if (!parent) {
1528                                 pr_err("transaction release %d bad parent offset",
1529                                        debug_id);
1530                                 continue;
1531                         }
1532                         /*
1533                          * Since the parent was already fixed up, convert it
1534                          * back to kernel address space to access it
1535                          */
1536                         parent_buffer = parent->buffer -
1537                                 proc->user_buffer_offset;
1538
1539                         fd_buf_size = sizeof(u32) * fda->num_fds;
1540                         if (fda->num_fds >= SIZE_MAX / sizeof(u32)) {
1541                                 pr_err("transaction release %d invalid number of fds (%lld)\n",
1542                                        debug_id, (u64)fda->num_fds);
1543                                 continue;
1544                         }
1545                         if (fd_buf_size > parent->length ||
1546                             fda->parent_offset > parent->length - fd_buf_size) {
1547                                 /* No space for all file descriptors here. */
1548                                 pr_err("transaction release %d not enough space for %lld fds in buffer\n",
1549                                        debug_id, (u64)fda->num_fds);
1550                                 continue;
1551                         }
1552                         fd_array = (u32 *)(parent_buffer + fda->parent_offset);
1553                         for (fd_index = 0; fd_index < fda->num_fds; fd_index++)
1554                                 task_close_fd(proc, fd_array[fd_index]);
1555                 } break;
1556                 default:
1557                         pr_err("transaction release %d bad object type %x\n",
1558                                 debug_id, hdr->type);
1559                         break;
1560                 }
1561         }
1562 }
1563
1564 static int binder_translate_binder(struct flat_binder_object *fp,
1565                                    struct binder_transaction *t,
1566                                    struct binder_thread *thread)
1567 {
1568         struct binder_node *node;
1569         struct binder_ref *ref;
1570         struct binder_proc *proc = thread->proc;
1571         struct binder_proc *target_proc = t->to_proc;
1572
1573         node = binder_get_node(proc, fp->binder);
1574         if (!node) {
1575                 node = binder_new_node(proc, fp->binder, fp->cookie);
1576                 if (!node)
1577                         return -ENOMEM;
1578
1579                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
1580                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
1581         }
1582         if (fp->cookie != node->cookie) {
1583                 binder_user_error("%d:%d sending u%016llx node %d, cookie mismatch %016llx != %016llx\n",
1584                                   proc->pid, thread->pid, (u64)fp->binder,
1585                                   node->debug_id, (u64)fp->cookie,
1586                                   (u64)node->cookie);
1587                 return -EINVAL;
1588         }
1589         if (security_binder_transfer_binder(proc->tsk, target_proc->tsk))
1590                 return -EPERM;
1591
1592         ref = binder_get_ref_for_node(target_proc, node);
1593         if (!ref)
1594                 return -EINVAL;
1595
1596         if (fp->hdr.type == BINDER_TYPE_BINDER)
1597                 fp->hdr.type = BINDER_TYPE_HANDLE;
1598         else
1599                 fp->hdr.type = BINDER_TYPE_WEAK_HANDLE;
1600         fp->binder = 0;
1601         fp->handle = ref->desc;
1602         fp->cookie = 0;
1603         binder_inc_ref(ref, fp->hdr.type == BINDER_TYPE_HANDLE, &thread->todo);
1604
1605         trace_binder_transaction_node_to_ref(t, node, ref);
1606         binder_debug(BINDER_DEBUG_TRANSACTION,
1607                      "        node %d u%016llx -> ref %d desc %d\n",
1608                      node->debug_id, (u64)node->ptr,
1609                      ref->debug_id, ref->desc);
1610
1611         return 0;
1612 }
1613
1614 static int binder_translate_handle(struct flat_binder_object *fp,
1615                                    struct binder_transaction *t,
1616                                    struct binder_thread *thread)
1617 {
1618         struct binder_ref *ref;
1619         struct binder_proc *proc = thread->proc;
1620         struct binder_proc *target_proc = t->to_proc;
1621
1622         ref = binder_get_ref(proc, fp->handle,
1623                              fp->hdr.type == BINDER_TYPE_HANDLE);
1624         if (!ref) {
1625                 binder_user_error("%d:%d got transaction with invalid handle, %d\n",
1626                                   proc->pid, thread->pid, fp->handle);
1627                 return -EINVAL;
1628         }
1629         if (security_binder_transfer_binder(proc->tsk, target_proc->tsk))
1630                 return -EPERM;
1631
1632         if (ref->node->proc == target_proc) {
1633                 if (fp->hdr.type == BINDER_TYPE_HANDLE)
1634                         fp->hdr.type = BINDER_TYPE_BINDER;
1635                 else
1636                         fp->hdr.type = BINDER_TYPE_WEAK_BINDER;
1637                 fp->binder = ref->node->ptr;
1638                 fp->cookie = ref->node->cookie;
1639                 binder_inc_node(ref->node, fp->hdr.type == BINDER_TYPE_BINDER,
1640                                 0, NULL);
1641                 trace_binder_transaction_ref_to_node(t, ref);
1642                 binder_debug(BINDER_DEBUG_TRANSACTION,
1643                              "        ref %d desc %d -> node %d u%016llx\n",
1644                              ref->debug_id, ref->desc, ref->node->debug_id,
1645                              (u64)ref->node->ptr);
1646         } else {
1647                 struct binder_ref *new_ref;
1648
1649                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
1650                 if (!new_ref)
1651                         return -EINVAL;
1652
1653                 fp->binder = 0;
1654                 fp->handle = new_ref->desc;
1655                 fp->cookie = 0;
1656                 binder_inc_ref(new_ref, fp->hdr.type == BINDER_TYPE_HANDLE,
1657                                NULL);
1658                 trace_binder_transaction_ref_to_ref(t, ref, new_ref);
1659                 binder_debug(BINDER_DEBUG_TRANSACTION,
1660                              "        ref %d desc %d -> ref %d desc %d (node %d)\n",
1661                              ref->debug_id, ref->desc, new_ref->debug_id,
1662                              new_ref->desc, ref->node->debug_id);
1663         }
1664         return 0;
1665 }
1666
1667 static int binder_translate_fd(int fd,
1668                                struct binder_transaction *t,
1669                                struct binder_thread *thread,
1670                                struct binder_transaction *in_reply_to)
1671 {
1672         struct binder_proc *proc = thread->proc;
1673         struct binder_proc *target_proc = t->to_proc;
1674         int target_fd;
1675         struct file *file;
1676         int ret;
1677         bool target_allows_fd;
1678
1679         if (in_reply_to)
1680                 target_allows_fd = !!(in_reply_to->flags & TF_ACCEPT_FDS);
1681         else
1682                 target_allows_fd = t->buffer->target_node->accept_fds;
1683         if (!target_allows_fd) {
1684                 binder_user_error("%d:%d got %s with fd, %d, but target does not allow fds\n",
1685                                   proc->pid, thread->pid,
1686                                   in_reply_to ? "reply" : "transaction",
1687                                   fd);
1688                 ret = -EPERM;
1689                 goto err_fd_not_accepted;
1690         }
1691
1692         file = fget(fd);
1693         if (!file) {
1694                 binder_user_error("%d:%d got transaction with invalid fd, %d\n",
1695                                   proc->pid, thread->pid, fd);
1696                 ret = -EBADF;
1697                 goto err_fget;
1698         }
1699         ret = security_binder_transfer_file(proc->tsk, target_proc->tsk, file);
1700         if (ret < 0) {
1701                 ret = -EPERM;
1702                 goto err_security;
1703         }
1704
1705         target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC);
1706         if (target_fd < 0) {
1707                 ret = -ENOMEM;
1708                 goto err_get_unused_fd;
1709         }
1710         task_fd_install(target_proc, target_fd, file);
1711         trace_binder_transaction_fd(t, fd, target_fd);
1712         binder_debug(BINDER_DEBUG_TRANSACTION, "        fd %d -> %d\n",
1713                      fd, target_fd);
1714
1715         return target_fd;
1716
1717 err_get_unused_fd:
1718 err_security:
1719         fput(file);
1720 err_fget:
1721 err_fd_not_accepted:
1722         return ret;
1723 }
1724
1725 static int binder_translate_fd_array(struct binder_fd_array_object *fda,
1726                                      struct binder_buffer_object *parent,
1727                                      struct binder_transaction *t,
1728                                      struct binder_thread *thread,
1729                                      struct binder_transaction *in_reply_to)
1730 {
1731         binder_size_t fdi, fd_buf_size, num_installed_fds;
1732         int target_fd;
1733         uintptr_t parent_buffer;
1734         u32 *fd_array;
1735         struct binder_proc *proc = thread->proc;
1736         struct binder_proc *target_proc = t->to_proc;
1737
1738         fd_buf_size = sizeof(u32) * fda->num_fds;
1739         if (fda->num_fds >= SIZE_MAX / sizeof(u32)) {
1740                 binder_user_error("%d:%d got transaction with invalid number of fds (%lld)\n",
1741                                   proc->pid, thread->pid, (u64)fda->num_fds);
1742                 return -EINVAL;
1743         }
1744         if (fd_buf_size > parent->length ||
1745             fda->parent_offset > parent->length - fd_buf_size) {
1746                 /* No space for all file descriptors here. */
1747                 binder_user_error("%d:%d not enough space to store %lld fds in buffer\n",
1748                                   proc->pid, thread->pid, (u64)fda->num_fds);
1749                 return -EINVAL;
1750         }
1751         /*
1752          * Since the parent was already fixed up, convert it
1753          * back to the kernel address space to access it
1754          */
1755         parent_buffer = parent->buffer - target_proc->user_buffer_offset;
1756         fd_array = (u32 *)(parent_buffer + fda->parent_offset);
1757         if (!IS_ALIGNED((unsigned long)fd_array, sizeof(u32))) {
1758                 binder_user_error("%d:%d parent offset not aligned correctly.\n",
1759                                   proc->pid, thread->pid);
1760                 return -EINVAL;
1761         }
1762         for (fdi = 0; fdi < fda->num_fds; fdi++) {
1763                 target_fd = binder_translate_fd(fd_array[fdi], t, thread,
1764                                                 in_reply_to);
1765                 if (target_fd < 0)
1766                         goto err_translate_fd_failed;
1767                 fd_array[fdi] = target_fd;
1768         }
1769         return 0;
1770
1771 err_translate_fd_failed:
1772         /*
1773          * Failed to allocate fd or security error, free fds
1774          * installed so far.
1775          */
1776         num_installed_fds = fdi;
1777         for (fdi = 0; fdi < num_installed_fds; fdi++)
1778                 task_close_fd(target_proc, fd_array[fdi]);
1779         return target_fd;
1780 }
1781
1782 static int binder_fixup_parent(struct binder_transaction *t,
1783                                struct binder_thread *thread,
1784                                struct binder_buffer_object *bp,
1785                                binder_size_t *off_start,
1786                                binder_size_t num_valid,
1787                                struct binder_buffer_object *last_fixup_obj,
1788                                binder_size_t last_fixup_min_off)
1789 {
1790         struct binder_buffer_object *parent;
1791         u8 *parent_buffer;
1792         struct binder_buffer *b = t->buffer;
1793         struct binder_proc *proc = thread->proc;
1794         struct binder_proc *target_proc = t->to_proc;
1795
1796         if (!(bp->flags & BINDER_BUFFER_FLAG_HAS_PARENT))
1797                 return 0;
1798
1799         parent = binder_validate_ptr(b, bp->parent, off_start, num_valid);
1800         if (!parent) {
1801                 binder_user_error("%d:%d got transaction with invalid parent offset or type\n",
1802                                   proc->pid, thread->pid);
1803                 return -EINVAL;
1804         }
1805
1806         if (!binder_validate_fixup(b, off_start,
1807                                    parent, bp->parent_offset,
1808                                    last_fixup_obj,
1809                                    last_fixup_min_off)) {
1810                 binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n",
1811                                   proc->pid, thread->pid);
1812                 return -EINVAL;
1813         }
1814
1815         if (parent->length < sizeof(binder_uintptr_t) ||
1816             bp->parent_offset > parent->length - sizeof(binder_uintptr_t)) {
1817                 /* No space for a pointer here! */
1818                 binder_user_error("%d:%d got transaction with invalid parent offset\n",
1819                                   proc->pid, thread->pid);
1820                 return -EINVAL;
1821         }
1822         parent_buffer = (u8 *)(parent->buffer -
1823                                target_proc->user_buffer_offset);
1824         *(binder_uintptr_t *)(parent_buffer + bp->parent_offset) = bp->buffer;
1825
1826         return 0;
1827 }
1828
1829 static void binder_transaction(struct binder_proc *proc,
1830                                struct binder_thread *thread,
1831                                struct binder_transaction_data *tr, int reply,
1832                                binder_size_t extra_buffers_size)
1833 {
1834         int ret;
1835         struct binder_transaction *t;
1836         struct binder_work *tcomplete;
1837         binder_size_t *offp, *off_end, *off_start;
1838         binder_size_t off_min;
1839         u8 *sg_bufp, *sg_buf_end;
1840         struct binder_proc *target_proc;
1841         struct binder_thread *target_thread = NULL;
1842         struct binder_node *target_node = NULL;
1843         struct list_head *target_list;
1844         wait_queue_head_t *target_wait;
1845         struct binder_transaction *in_reply_to = NULL;
1846         struct binder_transaction_log_entry *e;
1847         uint32_t return_error;
1848         struct binder_buffer_object *last_fixup_obj = NULL;
1849         binder_size_t last_fixup_min_off = 0;
1850         struct binder_context *context = proc->context;
1851
1852         e = binder_transaction_log_add(&binder_transaction_log);
1853         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
1854         e->from_proc = proc->pid;
1855         e->from_thread = thread->pid;
1856         e->target_handle = tr->target.handle;
1857         e->data_size = tr->data_size;
1858         e->offsets_size = tr->offsets_size;
1859         e->context_name = proc->context->name;
1860
1861         if (reply) {
1862                 in_reply_to = thread->transaction_stack;
1863                 if (in_reply_to == NULL) {
1864                         binder_user_error("%d:%d got reply transaction with no transaction stack\n",
1865                                           proc->pid, thread->pid);
1866                         return_error = BR_FAILED_REPLY;
1867                         goto err_empty_call_stack;
1868                 }
1869                 binder_set_nice(in_reply_to->saved_priority);
1870                 if (in_reply_to->to_thread != thread) {
1871                         binder_user_error("%d:%d got reply transaction with bad transaction stack, transaction %d has target %d:%d\n",
1872                                 proc->pid, thread->pid, in_reply_to->debug_id,
1873                                 in_reply_to->to_proc ?
1874                                 in_reply_to->to_proc->pid : 0,
1875                                 in_reply_to->to_thread ?
1876                                 in_reply_to->to_thread->pid : 0);
1877                         return_error = BR_FAILED_REPLY;
1878                         in_reply_to = NULL;
1879                         goto err_bad_call_stack;
1880                 }
1881                 thread->transaction_stack = in_reply_to->to_parent;
1882                 target_thread = in_reply_to->from;
1883                 if (target_thread == NULL) {
1884                         return_error = BR_DEAD_REPLY;
1885                         goto err_dead_binder;
1886                 }
1887                 if (target_thread->transaction_stack != in_reply_to) {
1888                         binder_user_error("%d:%d got reply transaction with bad target transaction stack %d, expected %d\n",
1889                                 proc->pid, thread->pid,
1890                                 target_thread->transaction_stack ?
1891                                 target_thread->transaction_stack->debug_id : 0,
1892                                 in_reply_to->debug_id);
1893                         return_error = BR_FAILED_REPLY;
1894                         in_reply_to = NULL;
1895                         target_thread = NULL;
1896                         goto err_dead_binder;
1897                 }
1898                 target_proc = target_thread->proc;
1899         } else {
1900                 if (tr->target.handle) {
1901                         struct binder_ref *ref;
1902
1903                         ref = binder_get_ref(proc, tr->target.handle, true);
1904                         if (ref == NULL) {
1905                                 binder_user_error("%d:%d got transaction to invalid handle\n",
1906                                         proc->pid, thread->pid);
1907                                 return_error = BR_FAILED_REPLY;
1908                                 goto err_invalid_target_handle;
1909                         }
1910                         target_node = ref->node;
1911                 } else {
1912                         target_node = context->binder_context_mgr_node;
1913                         if (target_node == NULL) {
1914                                 return_error = BR_DEAD_REPLY;
1915                                 goto err_no_context_mgr_node;
1916                         }
1917                 }
1918                 e->to_node = target_node->debug_id;
1919                 target_proc = target_node->proc;
1920                 if (target_proc == NULL) {
1921                         return_error = BR_DEAD_REPLY;
1922                         goto err_dead_binder;
1923                 }
1924                 if (security_binder_transaction(proc->tsk,
1925                                                 target_proc->tsk) < 0) {
1926                         return_error = BR_FAILED_REPLY;
1927                         goto err_invalid_target_handle;
1928                 }
1929                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
1930                         struct binder_transaction *tmp;
1931
1932                         tmp = thread->transaction_stack;
1933                         if (tmp->to_thread != thread) {
1934                                 binder_user_error("%d:%d got new transaction with bad transaction stack, transaction %d has target %d:%d\n",
1935                                         proc->pid, thread->pid, tmp->debug_id,
1936                                         tmp->to_proc ? tmp->to_proc->pid : 0,
1937                                         tmp->to_thread ?
1938                                         tmp->to_thread->pid : 0);
1939                                 return_error = BR_FAILED_REPLY;
1940                                 goto err_bad_call_stack;
1941                         }
1942                         while (tmp) {
1943                                 if (tmp->from && tmp->from->proc == target_proc)
1944                                         target_thread = tmp->from;
1945                                 tmp = tmp->from_parent;
1946                         }
1947                 }
1948         }
1949         if (target_thread) {
1950                 e->to_thread = target_thread->pid;
1951                 target_list = &target_thread->todo;
1952                 target_wait = &target_thread->wait;
1953         } else {
1954                 target_list = &target_proc->todo;
1955                 target_wait = &target_proc->wait;
1956         }
1957         e->to_proc = target_proc->pid;
1958
1959         /* TODO: reuse incoming transaction for reply */
1960         t = kzalloc(sizeof(*t), GFP_KERNEL);
1961         if (t == NULL) {
1962                 return_error = BR_FAILED_REPLY;
1963                 goto err_alloc_t_failed;
1964         }
1965         binder_stats_created(BINDER_STAT_TRANSACTION);
1966
1967         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
1968         if (tcomplete == NULL) {
1969                 return_error = BR_FAILED_REPLY;
1970                 goto err_alloc_tcomplete_failed;
1971         }
1972         binder_stats_created(BINDER_STAT_TRANSACTION_COMPLETE);
1973
1974         t->debug_id = ++binder_last_id;
1975         e->debug_id = t->debug_id;
1976
1977         if (reply)
1978                 binder_debug(BINDER_DEBUG_TRANSACTION,
1979                              "%d:%d BC_REPLY %d -> %d:%d, data %016llx-%016llx size %lld-%lld-%lld\n",
1980                              proc->pid, thread->pid, t->debug_id,
1981                              target_proc->pid, target_thread->pid,
1982                              (u64)tr->data.ptr.buffer,
1983                              (u64)tr->data.ptr.offsets,
1984                              (u64)tr->data_size, (u64)tr->offsets_size,
1985                              (u64)extra_buffers_size);
1986         else
1987                 binder_debug(BINDER_DEBUG_TRANSACTION,
1988                              "%d:%d BC_TRANSACTION %d -> %d - node %d, data %016llx-%016llx size %lld-%lld-%lld\n",
1989                              proc->pid, thread->pid, t->debug_id,
1990                              target_proc->pid, target_node->debug_id,
1991                              (u64)tr->data.ptr.buffer,
1992                              (u64)tr->data.ptr.offsets,
1993                              (u64)tr->data_size, (u64)tr->offsets_size,
1994                              (u64)extra_buffers_size);
1995
1996         if (!reply && !(tr->flags & TF_ONE_WAY))
1997                 t->from = thread;
1998         else
1999                 t->from = NULL;
2000         t->sender_euid = task_euid(proc->tsk);
2001         t->to_proc = target_proc;
2002         t->to_thread = target_thread;
2003         t->code = tr->code;
2004         t->flags = tr->flags;
2005         t->priority = task_nice(current);
2006
2007         trace_binder_transaction(reply, t, target_node);
2008
2009         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
2010                 tr->offsets_size, extra_buffers_size,
2011                 !reply && (t->flags & TF_ONE_WAY));
2012         if (t->buffer == NULL) {
2013                 return_error = BR_FAILED_REPLY;
2014                 goto err_binder_alloc_buf_failed;
2015         }
2016         t->buffer->allow_user_free = 0;
2017         t->buffer->debug_id = t->debug_id;
2018         t->buffer->transaction = t;
2019         t->buffer->target_node = target_node;
2020         trace_binder_transaction_alloc_buf(t->buffer);
2021         if (target_node)
2022                 binder_inc_node(target_node, 1, 0, NULL);
2023
2024         off_start = (binder_size_t *)(t->buffer->data +
2025                                       ALIGN(tr->data_size, sizeof(void *)));
2026         offp = off_start;
2027
2028         if (copy_from_user(t->buffer->data, (const void __user *)(uintptr_t)
2029                            tr->data.ptr.buffer, tr->data_size)) {
2030                 binder_user_error("%d:%d got transaction with invalid data ptr\n",
2031                                 proc->pid, thread->pid);
2032                 return_error = BR_FAILED_REPLY;
2033                 goto err_copy_data_failed;
2034         }
2035         if (copy_from_user(offp, (const void __user *)(uintptr_t)
2036                            tr->data.ptr.offsets, tr->offsets_size)) {
2037                 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
2038                                 proc->pid, thread->pid);
2039                 return_error = BR_FAILED_REPLY;
2040                 goto err_copy_data_failed;
2041         }
2042         if (!IS_ALIGNED(tr->offsets_size, sizeof(binder_size_t))) {
2043                 binder_user_error("%d:%d got transaction with invalid offsets size, %lld\n",
2044                                 proc->pid, thread->pid, (u64)tr->offsets_size);
2045                 return_error = BR_FAILED_REPLY;
2046                 goto err_bad_offset;
2047         }
2048         if (!IS_ALIGNED(extra_buffers_size, sizeof(u64))) {
2049                 binder_user_error("%d:%d got transaction with unaligned buffers size, %lld\n",
2050                                   proc->pid, thread->pid,
2051                                   (u64)extra_buffers_size);
2052                 return_error = BR_FAILED_REPLY;
2053                 goto err_bad_offset;
2054         }
2055         off_end = (void *)off_start + tr->offsets_size;
2056         sg_bufp = (u8 *)(PTR_ALIGN(off_end, sizeof(void *)));
2057         sg_buf_end = sg_bufp + extra_buffers_size;
2058         off_min = 0;
2059         for (; offp < off_end; offp++) {
2060                 struct binder_object_header *hdr;
2061                 size_t object_size = binder_validate_object(t->buffer, *offp);
2062
2063                 if (object_size == 0 || *offp < off_min) {
2064                         binder_user_error("%d:%d got transaction with invalid offset (%lld, min %lld max %lld) or object.\n",
2065                                           proc->pid, thread->pid, (u64)*offp,
2066                                           (u64)off_min,
2067                                           (u64)t->buffer->data_size);
2068                         return_error = BR_FAILED_REPLY;
2069                         goto err_bad_offset;
2070                 }
2071
2072                 hdr = (struct binder_object_header *)(t->buffer->data + *offp);
2073                 off_min = *offp + object_size;
2074                 switch (hdr->type) {
2075                 case BINDER_TYPE_BINDER:
2076                 case BINDER_TYPE_WEAK_BINDER: {
2077                         struct flat_binder_object *fp;
2078
2079                         fp = to_flat_binder_object(hdr);
2080                         ret = binder_translate_binder(fp, t, thread);
2081                         if (ret < 0) {
2082                                 return_error = BR_FAILED_REPLY;
2083                                 goto err_translate_failed;
2084                         }
2085                 } break;
2086                 case BINDER_TYPE_HANDLE:
2087                 case BINDER_TYPE_WEAK_HANDLE: {
2088                         struct flat_binder_object *fp;
2089
2090                         fp = to_flat_binder_object(hdr);
2091                         ret = binder_translate_handle(fp, t, thread);
2092                         if (ret < 0) {
2093                                 return_error = BR_FAILED_REPLY;
2094                                 goto err_translate_failed;
2095                         }
2096                 } break;
2097
2098                 case BINDER_TYPE_FD: {
2099                         struct binder_fd_object *fp = to_binder_fd_object(hdr);
2100                         int target_fd = binder_translate_fd(fp->fd, t, thread,
2101                                                             in_reply_to);
2102
2103                         if (target_fd < 0) {
2104                                 return_error = BR_FAILED_REPLY;
2105                                 goto err_translate_failed;
2106                         }
2107                         fp->pad_binder = 0;
2108                         fp->fd = target_fd;
2109                 } break;
2110                 case BINDER_TYPE_FDA: {
2111                         struct binder_fd_array_object *fda =
2112                                 to_binder_fd_array_object(hdr);
2113                         struct binder_buffer_object *parent =
2114                                 binder_validate_ptr(t->buffer, fda->parent,
2115                                                     off_start,
2116                                                     offp - off_start);
2117                         if (!parent) {
2118                                 binder_user_error("%d:%d got transaction with invalid parent offset or type\n",
2119                                                   proc->pid, thread->pid);
2120                                 return_error = BR_FAILED_REPLY;
2121                                 goto err_bad_parent;
2122                         }
2123                         if (!binder_validate_fixup(t->buffer, off_start,
2124                                                    parent, fda->parent_offset,
2125                                                    last_fixup_obj,
2126                                                    last_fixup_min_off)) {
2127                                 binder_user_error("%d:%d got transaction with out-of-order buffer fixup\n",
2128                                                   proc->pid, thread->pid);
2129                                 return_error = BR_FAILED_REPLY;
2130                                 goto err_bad_parent;
2131                         }
2132                         ret = binder_translate_fd_array(fda, parent, t, thread,
2133                                                         in_reply_to);
2134                         if (ret < 0) {
2135                                 return_error = BR_FAILED_REPLY;
2136                                 goto err_translate_failed;
2137                         }
2138                         last_fixup_obj = parent;
2139                         last_fixup_min_off =
2140                                 fda->parent_offset + sizeof(u32) * fda->num_fds;
2141                 } break;
2142                 case BINDER_TYPE_PTR: {
2143                         struct binder_buffer_object *bp =
2144                                 to_binder_buffer_object(hdr);
2145                         size_t buf_left = sg_buf_end - sg_bufp;
2146
2147                         if (bp->length > buf_left) {
2148                                 binder_user_error("%d:%d got transaction with too large buffer\n",
2149                                                   proc->pid, thread->pid);
2150                                 return_error = BR_FAILED_REPLY;
2151                                 goto err_bad_offset;
2152                         }
2153                         if (copy_from_user(sg_bufp,
2154                                            (const void __user *)(uintptr_t)
2155                                            bp->buffer, bp->length)) {
2156                                 binder_user_error("%d:%d got transaction with invalid offsets ptr\n",
2157                                                   proc->pid, thread->pid);
2158                                 return_error = BR_FAILED_REPLY;
2159                                 goto err_copy_data_failed;
2160                         }
2161                         /* Fixup buffer pointer to target proc address space */
2162                         bp->buffer = (uintptr_t)sg_bufp +
2163                                 target_proc->user_buffer_offset;
2164                         sg_bufp += ALIGN(bp->length, sizeof(u64));
2165
2166                         ret = binder_fixup_parent(t, thread, bp, off_start,
2167                                                   offp - off_start,
2168                                                   last_fixup_obj,
2169                                                   last_fixup_min_off);
2170                         if (ret < 0) {
2171                                 return_error = BR_FAILED_REPLY;
2172                                 goto err_translate_failed;
2173                         }
2174                         last_fixup_obj = bp;
2175                         last_fixup_min_off = 0;
2176                 } break;
2177                 default:
2178                         binder_user_error("%d:%d got transaction with invalid object type, %x\n",
2179                                 proc->pid, thread->pid, hdr->type);
2180                         return_error = BR_FAILED_REPLY;
2181                         goto err_bad_object_type;
2182                 }
2183         }
2184         if (reply) {
2185                 BUG_ON(t->buffer->async_transaction != 0);
2186                 binder_pop_transaction(target_thread, in_reply_to);
2187         } else if (!(t->flags & TF_ONE_WAY)) {
2188                 BUG_ON(t->buffer->async_transaction != 0);
2189                 t->need_reply = 1;
2190                 t->from_parent = thread->transaction_stack;
2191                 thread->transaction_stack = t;
2192         } else {
2193                 BUG_ON(target_node == NULL);
2194                 BUG_ON(t->buffer->async_transaction != 1);
2195                 if (target_node->has_async_transaction) {
2196                         target_list = &target_node->async_todo;
2197                         target_wait = NULL;
2198                 } else
2199                         target_node->has_async_transaction = 1;
2200         }
2201         t->work.type = BINDER_WORK_TRANSACTION;
2202         list_add_tail(&t->work.entry, target_list);
2203         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
2204         list_add_tail(&tcomplete->entry, &thread->todo);
2205         if (target_wait)
2206                 wake_up_interruptible(target_wait);
2207         return;
2208
2209 err_translate_failed:
2210 err_bad_object_type:
2211 err_bad_offset:
2212 err_bad_parent:
2213 err_copy_data_failed:
2214         trace_binder_transaction_failed_buffer_release(t->buffer);
2215         binder_transaction_buffer_release(target_proc, t->buffer, offp);
2216         t->buffer->transaction = NULL;
2217         binder_free_buf(target_proc, t->buffer);
2218 err_binder_alloc_buf_failed:
2219         kfree(tcomplete);
2220         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2221 err_alloc_tcomplete_failed:
2222         kfree(t);
2223         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2224 err_alloc_t_failed:
2225 err_bad_call_stack:
2226 err_empty_call_stack:
2227 err_dead_binder:
2228 err_invalid_target_handle:
2229 err_no_context_mgr_node:
2230         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2231                      "%d:%d transaction failed %d, size %lld-%lld\n",
2232                      proc->pid, thread->pid, return_error,
2233                      (u64)tr->data_size, (u64)tr->offsets_size);
2234
2235         {
2236                 struct binder_transaction_log_entry *fe;
2237
2238                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
2239                 *fe = *e;
2240         }
2241
2242         BUG_ON(thread->return_error != BR_OK);
2243         if (in_reply_to) {
2244                 thread->return_error = BR_TRANSACTION_COMPLETE;
2245                 binder_send_failed_reply(in_reply_to, return_error);
2246         } else
2247                 thread->return_error = return_error;
2248 }
2249
2250 static int binder_thread_write(struct binder_proc *proc,
2251                         struct binder_thread *thread,
2252                         binder_uintptr_t binder_buffer, size_t size,
2253                         binder_size_t *consumed)
2254 {
2255         uint32_t cmd;
2256         struct binder_context *context = proc->context;
2257         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2258         void __user *ptr = buffer + *consumed;
2259         void __user *end = buffer + size;
2260
2261         while (ptr < end && thread->return_error == BR_OK) {
2262                 if (get_user(cmd, (uint32_t __user *)ptr))
2263                         return -EFAULT;
2264                 ptr += sizeof(uint32_t);
2265                 trace_binder_command(cmd);
2266                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
2267                         binder_stats.bc[_IOC_NR(cmd)]++;
2268                         proc->stats.bc[_IOC_NR(cmd)]++;
2269                         thread->stats.bc[_IOC_NR(cmd)]++;
2270                 }
2271                 switch (cmd) {
2272                 case BC_INCREFS:
2273                 case BC_ACQUIRE:
2274                 case BC_RELEASE:
2275                 case BC_DECREFS: {
2276                         uint32_t target;
2277                         struct binder_ref *ref;
2278                         const char *debug_string;
2279
2280                         if (get_user(target, (uint32_t __user *)ptr))
2281                                 return -EFAULT;
2282                         ptr += sizeof(uint32_t);
2283                         if (target == 0 && context->binder_context_mgr_node &&
2284                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
2285                                 ref = binder_get_ref_for_node(proc,
2286                                         context->binder_context_mgr_node);
2287                                 if (ref->desc != target) {
2288                                         binder_user_error("%d:%d tried to acquire reference to desc 0, got %d instead\n",
2289                                                 proc->pid, thread->pid,
2290                                                 ref->desc);
2291                                 }
2292                         } else
2293                                 ref = binder_get_ref(proc, target,
2294                                                      cmd == BC_ACQUIRE ||
2295                                                      cmd == BC_RELEASE);
2296                         if (ref == NULL) {
2297                                 binder_user_error("%d:%d refcount change on invalid ref %d\n",
2298                                         proc->pid, thread->pid, target);
2299                                 break;
2300                         }
2301                         switch (cmd) {
2302                         case BC_INCREFS:
2303                                 debug_string = "IncRefs";
2304                                 binder_inc_ref(ref, 0, NULL);
2305                                 break;
2306                         case BC_ACQUIRE:
2307                                 debug_string = "Acquire";
2308                                 binder_inc_ref(ref, 1, NULL);
2309                                 break;
2310                         case BC_RELEASE:
2311                                 debug_string = "Release";
2312                                 binder_dec_ref(ref, 1);
2313                                 break;
2314                         case BC_DECREFS:
2315                         default:
2316                                 debug_string = "DecRefs";
2317                                 binder_dec_ref(ref, 0);
2318                                 break;
2319                         }
2320                         binder_debug(BINDER_DEBUG_USER_REFS,
2321                                      "%d:%d %s ref %d desc %d s %d w %d for node %d\n",
2322                                      proc->pid, thread->pid, debug_string, ref->debug_id,
2323                                      ref->desc, ref->strong, ref->weak, ref->node->debug_id);
2324                         break;
2325                 }
2326                 case BC_INCREFS_DONE:
2327                 case BC_ACQUIRE_DONE: {
2328                         binder_uintptr_t node_ptr;
2329                         binder_uintptr_t cookie;
2330                         struct binder_node *node;
2331
2332                         if (get_user(node_ptr, (binder_uintptr_t __user *)ptr))
2333                                 return -EFAULT;
2334                         ptr += sizeof(binder_uintptr_t);
2335                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2336                                 return -EFAULT;
2337                         ptr += sizeof(binder_uintptr_t);
2338                         node = binder_get_node(proc, node_ptr);
2339                         if (node == NULL) {
2340                                 binder_user_error("%d:%d %s u%016llx no match\n",
2341                                         proc->pid, thread->pid,
2342                                         cmd == BC_INCREFS_DONE ?
2343                                         "BC_INCREFS_DONE" :
2344                                         "BC_ACQUIRE_DONE",
2345                                         (u64)node_ptr);
2346                                 break;
2347                         }
2348                         if (cookie != node->cookie) {
2349                                 binder_user_error("%d:%d %s u%016llx node %d cookie mismatch %016llx != %016llx\n",
2350                                         proc->pid, thread->pid,
2351                                         cmd == BC_INCREFS_DONE ?
2352                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
2353                                         (u64)node_ptr, node->debug_id,
2354                                         (u64)cookie, (u64)node->cookie);
2355                                 break;
2356                         }
2357                         if (cmd == BC_ACQUIRE_DONE) {
2358                                 if (node->pending_strong_ref == 0) {
2359                                         binder_user_error("%d:%d BC_ACQUIRE_DONE node %d has no pending acquire request\n",
2360                                                 proc->pid, thread->pid,
2361                                                 node->debug_id);
2362                                         break;
2363                                 }
2364                                 node->pending_strong_ref = 0;
2365                         } else {
2366                                 if (node->pending_weak_ref == 0) {
2367                                         binder_user_error("%d:%d BC_INCREFS_DONE node %d has no pending increfs request\n",
2368                                                 proc->pid, thread->pid,
2369                                                 node->debug_id);
2370                                         break;
2371                                 }
2372                                 node->pending_weak_ref = 0;
2373                         }
2374                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
2375                         binder_debug(BINDER_DEBUG_USER_REFS,
2376                                      "%d:%d %s node %d ls %d lw %d\n",
2377                                      proc->pid, thread->pid,
2378                                      cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
2379                                      node->debug_id, node->local_strong_refs, node->local_weak_refs);
2380                         break;
2381                 }
2382                 case BC_ATTEMPT_ACQUIRE:
2383                         pr_err("BC_ATTEMPT_ACQUIRE not supported\n");
2384                         return -EINVAL;
2385                 case BC_ACQUIRE_RESULT:
2386                         pr_err("BC_ACQUIRE_RESULT not supported\n");
2387                         return -EINVAL;
2388
2389                 case BC_FREE_BUFFER: {
2390                         binder_uintptr_t data_ptr;
2391                         struct binder_buffer *buffer;
2392
2393                         if (get_user(data_ptr, (binder_uintptr_t __user *)ptr))
2394                                 return -EFAULT;
2395                         ptr += sizeof(binder_uintptr_t);
2396
2397                         buffer = binder_buffer_lookup(proc, data_ptr);
2398                         if (buffer == NULL) {
2399                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx no match\n",
2400                                         proc->pid, thread->pid, (u64)data_ptr);
2401                                 break;
2402                         }
2403                         if (!buffer->allow_user_free) {
2404                                 binder_user_error("%d:%d BC_FREE_BUFFER u%016llx matched unreturned buffer\n",
2405                                         proc->pid, thread->pid, (u64)data_ptr);
2406                                 break;
2407                         }
2408                         binder_debug(BINDER_DEBUG_FREE_BUFFER,
2409                                      "%d:%d BC_FREE_BUFFER u%016llx found buffer %d for %s transaction\n",
2410                                      proc->pid, thread->pid, (u64)data_ptr,
2411                                      buffer->debug_id,
2412                                      buffer->transaction ? "active" : "finished");
2413
2414                         if (buffer->transaction) {
2415                                 buffer->transaction->buffer = NULL;
2416                                 buffer->transaction = NULL;
2417                         }
2418                         if (buffer->async_transaction && buffer->target_node) {
2419                                 BUG_ON(!buffer->target_node->has_async_transaction);
2420                                 if (list_empty(&buffer->target_node->async_todo))
2421                                         buffer->target_node->has_async_transaction = 0;
2422                                 else
2423                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
2424                         }
2425                         trace_binder_transaction_buffer_release(buffer);
2426                         binder_transaction_buffer_release(proc, buffer, NULL);
2427                         binder_free_buf(proc, buffer);
2428                         break;
2429                 }
2430
2431                 case BC_TRANSACTION_SG:
2432                 case BC_REPLY_SG: {
2433                         struct binder_transaction_data_sg tr;
2434
2435                         if (copy_from_user(&tr, ptr, sizeof(tr)))
2436                                 return -EFAULT;
2437                         ptr += sizeof(tr);
2438                         binder_transaction(proc, thread, &tr.transaction_data,
2439                                            cmd == BC_REPLY_SG, tr.buffers_size);
2440                         break;
2441                 }
2442                 case BC_TRANSACTION:
2443                 case BC_REPLY: {
2444                         struct binder_transaction_data tr;
2445
2446                         if (copy_from_user(&tr, ptr, sizeof(tr)))
2447                                 return -EFAULT;
2448                         ptr += sizeof(tr);
2449                         binder_transaction(proc, thread, &tr,
2450                                            cmd == BC_REPLY, 0);
2451                         break;
2452                 }
2453
2454                 case BC_REGISTER_LOOPER:
2455                         binder_debug(BINDER_DEBUG_THREADS,
2456                                      "%d:%d BC_REGISTER_LOOPER\n",
2457                                      proc->pid, thread->pid);
2458                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
2459                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
2460                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called after BC_ENTER_LOOPER\n",
2461                                         proc->pid, thread->pid);
2462                         } else if (proc->requested_threads == 0) {
2463                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
2464                                 binder_user_error("%d:%d ERROR: BC_REGISTER_LOOPER called without request\n",
2465                                         proc->pid, thread->pid);
2466                         } else {
2467                                 proc->requested_threads--;
2468                                 proc->requested_threads_started++;
2469                         }
2470                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
2471                         break;
2472                 case BC_ENTER_LOOPER:
2473                         binder_debug(BINDER_DEBUG_THREADS,
2474                                      "%d:%d BC_ENTER_LOOPER\n",
2475                                      proc->pid, thread->pid);
2476                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
2477                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
2478                                 binder_user_error("%d:%d ERROR: BC_ENTER_LOOPER called after BC_REGISTER_LOOPER\n",
2479                                         proc->pid, thread->pid);
2480                         }
2481                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
2482                         break;
2483                 case BC_EXIT_LOOPER:
2484                         binder_debug(BINDER_DEBUG_THREADS,
2485                                      "%d:%d BC_EXIT_LOOPER\n",
2486                                      proc->pid, thread->pid);
2487                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
2488                         break;
2489
2490                 case BC_REQUEST_DEATH_NOTIFICATION:
2491                 case BC_CLEAR_DEATH_NOTIFICATION: {
2492                         uint32_t target;
2493                         binder_uintptr_t cookie;
2494                         struct binder_ref *ref;
2495                         struct binder_ref_death *death;
2496
2497                         if (get_user(target, (uint32_t __user *)ptr))
2498                                 return -EFAULT;
2499                         ptr += sizeof(uint32_t);
2500                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2501                                 return -EFAULT;
2502                         ptr += sizeof(binder_uintptr_t);
2503                         ref = binder_get_ref(proc, target, false);
2504                         if (ref == NULL) {
2505                                 binder_user_error("%d:%d %s invalid ref %d\n",
2506                                         proc->pid, thread->pid,
2507                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2508                                         "BC_REQUEST_DEATH_NOTIFICATION" :
2509                                         "BC_CLEAR_DEATH_NOTIFICATION",
2510                                         target);
2511                                 break;
2512                         }
2513
2514                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2515                                      "%d:%d %s %016llx ref %d desc %d s %d w %d for node %d\n",
2516                                      proc->pid, thread->pid,
2517                                      cmd == BC_REQUEST_DEATH_NOTIFICATION ?
2518                                      "BC_REQUEST_DEATH_NOTIFICATION" :
2519                                      "BC_CLEAR_DEATH_NOTIFICATION",
2520                                      (u64)cookie, ref->debug_id, ref->desc,
2521                                      ref->strong, ref->weak, ref->node->debug_id);
2522
2523                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
2524                                 if (ref->death) {
2525                                         binder_user_error("%d:%d BC_REQUEST_DEATH_NOTIFICATION death notification already set\n",
2526                                                 proc->pid, thread->pid);
2527                                         break;
2528                                 }
2529                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
2530                                 if (death == NULL) {
2531                                         thread->return_error = BR_ERROR;
2532                                         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
2533                                                      "%d:%d BC_REQUEST_DEATH_NOTIFICATION failed\n",
2534                                                      proc->pid, thread->pid);
2535                                         break;
2536                                 }
2537                                 binder_stats_created(BINDER_STAT_DEATH);
2538                                 INIT_LIST_HEAD(&death->work.entry);
2539                                 death->cookie = cookie;
2540                                 ref->death = death;
2541                                 if (ref->node->proc == NULL) {
2542                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
2543                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2544                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
2545                                         } else {
2546                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
2547                                                 wake_up_interruptible(&proc->wait);
2548                                         }
2549                                 }
2550                         } else {
2551                                 if (ref->death == NULL) {
2552                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification not active\n",
2553                                                 proc->pid, thread->pid);
2554                                         break;
2555                                 }
2556                                 death = ref->death;
2557                                 if (death->cookie != cookie) {
2558                                         binder_user_error("%d:%d BC_CLEAR_DEATH_NOTIFICATION death notification cookie mismatch %016llx != %016llx\n",
2559                                                 proc->pid, thread->pid,
2560                                                 (u64)death->cookie,
2561                                                 (u64)cookie);
2562                                         break;
2563                                 }
2564                                 ref->death = NULL;
2565                                 if (list_empty(&death->work.entry)) {
2566                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2567                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2568                                                 list_add_tail(&death->work.entry, &thread->todo);
2569                                         } else {
2570                                                 list_add_tail(&death->work.entry, &proc->todo);
2571                                                 wake_up_interruptible(&proc->wait);
2572                                         }
2573                                 } else {
2574                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
2575                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
2576                                 }
2577                         }
2578                 } break;
2579                 case BC_DEAD_BINDER_DONE: {
2580                         struct binder_work *w;
2581                         binder_uintptr_t cookie;
2582                         struct binder_ref_death *death = NULL;
2583
2584                         if (get_user(cookie, (binder_uintptr_t __user *)ptr))
2585                                 return -EFAULT;
2586
2587                         ptr += sizeof(cookie);
2588                         list_for_each_entry(w, &proc->delivered_death, entry) {
2589                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
2590
2591                                 if (tmp_death->cookie == cookie) {
2592                                         death = tmp_death;
2593                                         break;
2594                                 }
2595                         }
2596                         binder_debug(BINDER_DEBUG_DEAD_BINDER,
2597                                      "%d:%d BC_DEAD_BINDER_DONE %016llx found %p\n",
2598                                      proc->pid, thread->pid, (u64)cookie,
2599                                      death);
2600                         if (death == NULL) {
2601                                 binder_user_error("%d:%d BC_DEAD_BINDER_DONE %016llx not found\n",
2602                                         proc->pid, thread->pid, (u64)cookie);
2603                                 break;
2604                         }
2605
2606                         list_del_init(&death->work.entry);
2607                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
2608                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
2609                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
2610                                         list_add_tail(&death->work.entry, &thread->todo);
2611                                 } else {
2612                                         list_add_tail(&death->work.entry, &proc->todo);
2613                                         wake_up_interruptible(&proc->wait);
2614                                 }
2615                         }
2616                 } break;
2617
2618                 default:
2619                         pr_err("%d:%d unknown command %d\n",
2620                                proc->pid, thread->pid, cmd);
2621                         return -EINVAL;
2622                 }
2623                 *consumed = ptr - buffer;
2624         }
2625         return 0;
2626 }
2627
2628 static void binder_stat_br(struct binder_proc *proc,
2629                            struct binder_thread *thread, uint32_t cmd)
2630 {
2631         trace_binder_return(cmd);
2632         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
2633                 binder_stats.br[_IOC_NR(cmd)]++;
2634                 proc->stats.br[_IOC_NR(cmd)]++;
2635                 thread->stats.br[_IOC_NR(cmd)]++;
2636         }
2637 }
2638
2639 static int binder_has_proc_work(struct binder_proc *proc,
2640                                 struct binder_thread *thread)
2641 {
2642         return !list_empty(&proc->todo) ||
2643                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2644 }
2645
2646 static int binder_has_thread_work(struct binder_thread *thread)
2647 {
2648         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
2649                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
2650 }
2651
2652 static int binder_thread_read(struct binder_proc *proc,
2653                               struct binder_thread *thread,
2654                               binder_uintptr_t binder_buffer, size_t size,
2655                               binder_size_t *consumed, int non_block)
2656 {
2657         void __user *buffer = (void __user *)(uintptr_t)binder_buffer;
2658         void __user *ptr = buffer + *consumed;
2659         void __user *end = buffer + size;
2660
2661         int ret = 0;
2662         int wait_for_proc_work;
2663
2664         if (*consumed == 0) {
2665                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
2666                         return -EFAULT;
2667                 ptr += sizeof(uint32_t);
2668         }
2669
2670 retry:
2671         wait_for_proc_work = thread->transaction_stack == NULL &&
2672                                 list_empty(&thread->todo);
2673
2674         if (thread->return_error != BR_OK && ptr < end) {
2675                 if (thread->return_error2 != BR_OK) {
2676                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
2677                                 return -EFAULT;
2678                         ptr += sizeof(uint32_t);
2679                         binder_stat_br(proc, thread, thread->return_error2);
2680                         if (ptr == end)
2681                                 goto done;
2682                         thread->return_error2 = BR_OK;
2683                 }
2684                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
2685                         return -EFAULT;
2686                 ptr += sizeof(uint32_t);
2687                 binder_stat_br(proc, thread, thread->return_error);
2688                 thread->return_error = BR_OK;
2689                 goto done;
2690         }
2691
2692
2693         thread->looper |= BINDER_LOOPER_STATE_WAITING;
2694         if (wait_for_proc_work)
2695                 proc->ready_threads++;
2696
2697         binder_unlock(__func__);
2698
2699         trace_binder_wait_for_work(wait_for_proc_work,
2700                                    !!thread->transaction_stack,
2701                                    !list_empty(&thread->todo));
2702         if (wait_for_proc_work) {
2703                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2704                                         BINDER_LOOPER_STATE_ENTERED))) {
2705                         binder_user_error("%d:%d ERROR: Thread waiting for process work before calling BC_REGISTER_LOOPER or BC_ENTER_LOOPER (state %x)\n",
2706                                 proc->pid, thread->pid, thread->looper);
2707                         wait_event_interruptible(binder_user_error_wait,
2708                                                  binder_stop_on_user_error < 2);
2709                 }
2710                 binder_set_nice(proc->default_priority);
2711                 if (non_block) {
2712                         if (!binder_has_proc_work(proc, thread))
2713                                 ret = -EAGAIN;
2714                 } else
2715                         ret = wait_event_freezable_exclusive(proc->wait, binder_has_proc_work(proc, thread));
2716         } else {
2717                 if (non_block) {
2718                         if (!binder_has_thread_work(thread))
2719                                 ret = -EAGAIN;
2720                 } else
2721                         ret = wait_event_freezable(thread->wait, binder_has_thread_work(thread));
2722         }
2723
2724         binder_lock(__func__);
2725
2726         if (wait_for_proc_work)
2727                 proc->ready_threads--;
2728         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
2729
2730         if (ret)
2731                 return ret;
2732
2733         while (1) {
2734                 uint32_t cmd;
2735                 struct binder_transaction_data tr;
2736                 struct binder_work *w;
2737                 struct binder_transaction *t = NULL;
2738
2739                 if (!list_empty(&thread->todo)) {
2740                         w = list_first_entry(&thread->todo, struct binder_work,
2741                                              entry);
2742                 } else if (!list_empty(&proc->todo) && wait_for_proc_work) {
2743                         w = list_first_entry(&proc->todo, struct binder_work,
2744                                              entry);
2745                 } else {
2746                         /* no data added */
2747                         if (ptr - buffer == 4 &&
2748                             !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN))
2749                                 goto retry;
2750                         break;
2751                 }
2752
2753                 if (end - ptr < sizeof(tr) + 4)
2754                         break;
2755
2756                 switch (w->type) {
2757                 case BINDER_WORK_TRANSACTION: {
2758                         t = container_of(w, struct binder_transaction, work);
2759                 } break;
2760                 case BINDER_WORK_TRANSACTION_COMPLETE: {
2761                         cmd = BR_TRANSACTION_COMPLETE;
2762                         if (put_user(cmd, (uint32_t __user *)ptr))
2763                                 return -EFAULT;
2764                         ptr += sizeof(uint32_t);
2765
2766                         binder_stat_br(proc, thread, cmd);
2767                         binder_debug(BINDER_DEBUG_TRANSACTION_COMPLETE,
2768                                      "%d:%d BR_TRANSACTION_COMPLETE\n",
2769                                      proc->pid, thread->pid);
2770
2771                         list_del(&w->entry);
2772                         kfree(w);
2773                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
2774                 } break;
2775                 case BINDER_WORK_NODE: {
2776                         struct binder_node *node = container_of(w, struct binder_node, work);
2777                         uint32_t cmd = BR_NOOP;
2778                         const char *cmd_name;
2779                         int strong = node->internal_strong_refs || node->local_strong_refs;
2780                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
2781
2782                         if (weak && !node->has_weak_ref) {
2783                                 cmd = BR_INCREFS;
2784                                 cmd_name = "BR_INCREFS";
2785                                 node->has_weak_ref = 1;
2786                                 node->pending_weak_ref = 1;
2787                                 node->local_weak_refs++;
2788                         } else if (strong && !node->has_strong_ref) {
2789                                 cmd = BR_ACQUIRE;
2790                                 cmd_name = "BR_ACQUIRE";
2791                                 node->has_strong_ref = 1;
2792                                 node->pending_strong_ref = 1;
2793                                 node->local_strong_refs++;
2794                         } else if (!strong && node->has_strong_ref) {
2795                                 cmd = BR_RELEASE;
2796                                 cmd_name = "BR_RELEASE";
2797                                 node->has_strong_ref = 0;
2798                         } else if (!weak && node->has_weak_ref) {
2799                                 cmd = BR_DECREFS;
2800                                 cmd_name = "BR_DECREFS";
2801                                 node->has_weak_ref = 0;
2802                         }
2803                         if (cmd != BR_NOOP) {
2804                                 if (put_user(cmd, (uint32_t __user *)ptr))
2805                                         return -EFAULT;
2806                                 ptr += sizeof(uint32_t);
2807                                 if (put_user(node->ptr,
2808                                              (binder_uintptr_t __user *)ptr))
2809                                         return -EFAULT;
2810                                 ptr += sizeof(binder_uintptr_t);
2811                                 if (put_user(node->cookie,
2812                                              (binder_uintptr_t __user *)ptr))
2813                                         return -EFAULT;
2814                                 ptr += sizeof(binder_uintptr_t);
2815
2816                                 binder_stat_br(proc, thread, cmd);
2817                                 binder_debug(BINDER_DEBUG_USER_REFS,
2818                                              "%d:%d %s %d u%016llx c%016llx\n",
2819                                              proc->pid, thread->pid, cmd_name,
2820                                              node->debug_id,
2821                                              (u64)node->ptr, (u64)node->cookie);
2822                         } else {
2823                                 list_del_init(&w->entry);
2824                                 if (!weak && !strong) {
2825                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2826                                                      "%d:%d node %d u%016llx c%016llx deleted\n",
2827                                                      proc->pid, thread->pid,
2828                                                      node->debug_id,
2829                                                      (u64)node->ptr,
2830                                                      (u64)node->cookie);
2831                                         rb_erase(&node->rb_node, &proc->nodes);
2832                                         kfree(node);
2833                                         binder_stats_deleted(BINDER_STAT_NODE);
2834                                 } else {
2835                                         binder_debug(BINDER_DEBUG_INTERNAL_REFS,
2836                                                      "%d:%d node %d u%016llx c%016llx state unchanged\n",
2837                                                      proc->pid, thread->pid,
2838                                                      node->debug_id,
2839                                                      (u64)node->ptr,
2840                                                      (u64)node->cookie);
2841                                 }
2842                         }
2843                 } break;
2844                 case BINDER_WORK_DEAD_BINDER:
2845                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
2846                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
2847                         struct binder_ref_death *death;
2848                         uint32_t cmd;
2849
2850                         death = container_of(w, struct binder_ref_death, work);
2851                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
2852                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
2853                         else
2854                                 cmd = BR_DEAD_BINDER;
2855                         if (put_user(cmd, (uint32_t __user *)ptr))
2856                                 return -EFAULT;
2857                         ptr += sizeof(uint32_t);
2858                         if (put_user(death->cookie,
2859                                      (binder_uintptr_t __user *)ptr))
2860                                 return -EFAULT;
2861                         ptr += sizeof(binder_uintptr_t);
2862                         binder_stat_br(proc, thread, cmd);
2863                         binder_debug(BINDER_DEBUG_DEATH_NOTIFICATION,
2864                                      "%d:%d %s %016llx\n",
2865                                       proc->pid, thread->pid,
2866                                       cmd == BR_DEAD_BINDER ?
2867                                       "BR_DEAD_BINDER" :
2868                                       "BR_CLEAR_DEATH_NOTIFICATION_DONE",
2869                                       (u64)death->cookie);
2870
2871                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
2872                                 list_del(&w->entry);
2873                                 kfree(death);
2874                                 binder_stats_deleted(BINDER_STAT_DEATH);
2875                         } else
2876                                 list_move(&w->entry, &proc->delivered_death);
2877                         if (cmd == BR_DEAD_BINDER)
2878                                 goto done; /* DEAD_BINDER notifications can cause transactions */
2879                 } break;
2880                 }
2881
2882                 if (!t)
2883                         continue;
2884
2885                 BUG_ON(t->buffer == NULL);
2886                 if (t->buffer->target_node) {
2887                         struct binder_node *target_node = t->buffer->target_node;
2888
2889                         tr.target.ptr = target_node->ptr;
2890                         tr.cookie =  target_node->cookie;
2891                         t->saved_priority = task_nice(current);
2892                         if (t->priority < target_node->min_priority &&
2893                             !(t->flags & TF_ONE_WAY))
2894                                 binder_set_nice(t->priority);
2895                         else if (!(t->flags & TF_ONE_WAY) ||
2896                                  t->saved_priority > target_node->min_priority)
2897                                 binder_set_nice(target_node->min_priority);
2898                         cmd = BR_TRANSACTION;
2899                 } else {
2900                         tr.target.ptr = 0;
2901                         tr.cookie = 0;
2902                         cmd = BR_REPLY;
2903                 }
2904                 tr.code = t->code;
2905                 tr.flags = t->flags;
2906                 tr.sender_euid = from_kuid(current_user_ns(), t->sender_euid);
2907
2908                 if (t->from) {
2909                         struct task_struct *sender = t->from->proc->tsk;
2910
2911                         tr.sender_pid = task_tgid_nr_ns(sender,
2912                                                         task_active_pid_ns(current));
2913                 } else {
2914                         tr.sender_pid = 0;
2915                 }
2916
2917                 tr.data_size = t->buffer->data_size;
2918                 tr.offsets_size = t->buffer->offsets_size;
2919                 tr.data.ptr.buffer = (binder_uintptr_t)(
2920                                         (uintptr_t)t->buffer->data +
2921                                         proc->user_buffer_offset);
2922                 tr.data.ptr.offsets = tr.data.ptr.buffer +
2923                                         ALIGN(t->buffer->data_size,
2924                                             sizeof(void *));
2925
2926                 if (put_user(cmd, (uint32_t __user *)ptr))
2927                         return -EFAULT;
2928                 ptr += sizeof(uint32_t);
2929                 if (copy_to_user(ptr, &tr, sizeof(tr)))
2930                         return -EFAULT;
2931                 ptr += sizeof(tr);
2932
2933                 trace_binder_transaction_received(t);
2934                 binder_stat_br(proc, thread, cmd);
2935                 binder_debug(BINDER_DEBUG_TRANSACTION,
2936                              "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
2937                              proc->pid, thread->pid,
2938                              (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
2939                              "BR_REPLY",
2940                              t->debug_id, t->from ? t->from->proc->pid : 0,
2941                              t->from ? t->from->pid : 0, cmd,
2942                              t->buffer->data_size, t->buffer->offsets_size,
2943                              (u64)tr.data.ptr.buffer, (u64)tr.data.ptr.offsets);
2944
2945                 list_del(&t->work.entry);
2946                 t->buffer->allow_user_free = 1;
2947                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
2948                         t->to_parent = thread->transaction_stack;
2949                         t->to_thread = thread;
2950                         thread->transaction_stack = t;
2951                 } else {
2952                         t->buffer->transaction = NULL;
2953                         kfree(t);
2954                         binder_stats_deleted(BINDER_STAT_TRANSACTION);
2955                 }
2956                 break;
2957         }
2958
2959 done:
2960
2961         *consumed = ptr - buffer;
2962         if (proc->requested_threads + proc->ready_threads == 0 &&
2963             proc->requested_threads_started < proc->max_threads &&
2964             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
2965              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
2966              /*spawn a new thread if we leave this out */) {
2967                 proc->requested_threads++;
2968                 binder_debug(BINDER_DEBUG_THREADS,
2969                              "%d:%d BR_SPAWN_LOOPER\n",
2970                              proc->pid, thread->pid);
2971                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
2972                         return -EFAULT;
2973                 binder_stat_br(proc, thread, BR_SPAWN_LOOPER);
2974         }
2975         return 0;
2976 }
2977
2978 static void binder_release_work(struct list_head *list)
2979 {
2980         struct binder_work *w;
2981
2982         while (!list_empty(list)) {
2983                 w = list_first_entry(list, struct binder_work, entry);
2984                 list_del_init(&w->entry);
2985                 switch (w->type) {
2986                 case BINDER_WORK_TRANSACTION: {
2987                         struct binder_transaction *t;
2988
2989                         t = container_of(w, struct binder_transaction, work);
2990                         if (t->buffer->target_node &&
2991                             !(t->flags & TF_ONE_WAY)) {
2992                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
2993                         } else {
2994                                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
2995                                         "undelivered transaction %d\n",
2996                                         t->debug_id);
2997                                 t->buffer->transaction = NULL;
2998                                 kfree(t);
2999                                 binder_stats_deleted(BINDER_STAT_TRANSACTION);
3000                         }
3001                 } break;
3002                 case BINDER_WORK_TRANSACTION_COMPLETE: {
3003                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
3004                                 "undelivered TRANSACTION_COMPLETE\n");
3005                         kfree(w);
3006                         binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
3007                 } break;
3008                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3009                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
3010                         struct binder_ref_death *death;
3011
3012                         death = container_of(w, struct binder_ref_death, work);
3013                         binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
3014                                 "undelivered death notification, %016llx\n",
3015                                 (u64)death->cookie);
3016                         kfree(death);
3017                         binder_stats_deleted(BINDER_STAT_DEATH);
3018                 } break;
3019                 default:
3020                         pr_err("unexpected work type, %d, not freed\n",
3021                                w->type);
3022                         break;
3023                 }
3024         }
3025
3026 }
3027
3028 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
3029 {
3030         struct binder_thread *thread = NULL;
3031         struct rb_node *parent = NULL;
3032         struct rb_node **p = &proc->threads.rb_node;
3033
3034         while (*p) {
3035                 parent = *p;
3036                 thread = rb_entry(parent, struct binder_thread, rb_node);
3037
3038                 if (current->pid < thread->pid)
3039                         p = &(*p)->rb_left;
3040                 else if (current->pid > thread->pid)
3041                         p = &(*p)->rb_right;
3042                 else
3043                         break;
3044         }
3045         if (*p == NULL) {
3046                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
3047                 if (thread == NULL)
3048                         return NULL;
3049                 binder_stats_created(BINDER_STAT_THREAD);
3050                 thread->proc = proc;
3051                 thread->pid = current->pid;
3052                 init_waitqueue_head(&thread->wait);
3053                 INIT_LIST_HEAD(&thread->todo);
3054                 rb_link_node(&thread->rb_node, parent, p);
3055                 rb_insert_color(&thread->rb_node, &proc->threads);
3056                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
3057                 thread->return_error = BR_OK;
3058                 thread->return_error2 = BR_OK;
3059         }
3060         return thread;
3061 }
3062
3063 static int binder_free_thread(struct binder_proc *proc,
3064                               struct binder_thread *thread)
3065 {
3066         struct binder_transaction *t;
3067         struct binder_transaction *send_reply = NULL;
3068         int active_transactions = 0;
3069
3070         rb_erase(&thread->rb_node, &proc->threads);
3071         t = thread->transaction_stack;
3072         if (t && t->to_thread == thread)
3073                 send_reply = t;
3074         while (t) {
3075                 active_transactions++;
3076                 binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
3077                              "release %d:%d transaction %d %s, still active\n",
3078                               proc->pid, thread->pid,
3079                              t->debug_id,
3080                              (t->to_thread == thread) ? "in" : "out");
3081
3082                 if (t->to_thread == thread) {
3083                         t->to_proc = NULL;
3084                         t->to_thread = NULL;
3085                         if (t->buffer) {
3086                                 t->buffer->transaction = NULL;
3087                                 t->buffer = NULL;
3088                         }
3089                         t = t->to_parent;
3090                 } else if (t->from == thread) {
3091                         t->from = NULL;
3092                         t = t->from_parent;
3093                 } else
3094                         BUG();
3095         }
3096         if (send_reply)
3097                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
3098         binder_release_work(&thread->todo);
3099         kfree(thread);
3100         binder_stats_deleted(BINDER_STAT_THREAD);
3101         return active_transactions;
3102 }
3103
3104 static unsigned int binder_poll(struct file *filp,
3105                                 struct poll_table_struct *wait)
3106 {
3107         struct binder_proc *proc = filp->private_data;
3108         struct binder_thread *thread = NULL;
3109         int wait_for_proc_work;
3110
3111         binder_lock(__func__);
3112
3113         thread = binder_get_thread(proc);
3114
3115         wait_for_proc_work = thread->transaction_stack == NULL &&
3116                 list_empty(&thread->todo) && thread->return_error == BR_OK;
3117
3118         binder_unlock(__func__);
3119
3120         if (wait_for_proc_work) {
3121                 if (binder_has_proc_work(proc, thread))
3122                         return POLLIN;
3123                 poll_wait(filp, &proc->wait, wait);
3124                 if (binder_has_proc_work(proc, thread))
3125                         return POLLIN;
3126         } else {
3127                 if (binder_has_thread_work(thread))
3128                         return POLLIN;
3129                 poll_wait(filp, &thread->wait, wait);
3130                 if (binder_has_thread_work(thread))
3131                         return POLLIN;
3132         }
3133         return 0;
3134 }
3135
3136 static int binder_ioctl_write_read(struct file *filp,
3137                                 unsigned int cmd, unsigned long arg,
3138                                 struct binder_thread *thread)
3139 {
3140         int ret = 0;
3141         struct binder_proc *proc = filp->private_data;
3142         unsigned int size = _IOC_SIZE(cmd);
3143         void __user *ubuf = (void __user *)arg;
3144         struct binder_write_read bwr;
3145
3146         if (size != sizeof(struct binder_write_read)) {
3147                 ret = -EINVAL;
3148                 goto out;
3149         }
3150         if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
3151                 ret = -EFAULT;
3152                 goto out;
3153         }
3154         binder_debug(BINDER_DEBUG_READ_WRITE,
3155                      "%d:%d write %lld at %016llx, read %lld at %016llx\n",
3156                      proc->pid, thread->pid,
3157                      (u64)bwr.write_size, (u64)bwr.write_buffer,
3158                      (u64)bwr.read_size, (u64)bwr.read_buffer);
3159
3160         if (bwr.write_size > 0) {
3161                 ret = binder_thread_write(proc, thread,
3162                                           bwr.write_buffer,
3163                                           bwr.write_size,
3164                                           &bwr.write_consumed);
3165                 trace_binder_write_done(ret);
3166                 if (ret < 0) {
3167                         bwr.read_consumed = 0;
3168                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
3169                                 ret = -EFAULT;
3170                         goto out;
3171                 }
3172         }
3173         if (bwr.read_size > 0) {
3174                 ret = binder_thread_read(proc, thread, bwr.read_buffer,
3175                                          bwr.read_size,
3176                                          &bwr.read_consumed,
3177                                          filp->f_flags & O_NONBLOCK);
3178                 trace_binder_read_done(ret);
3179                 if (!list_empty(&proc->todo))
3180                         wake_up_interruptible(&proc->wait);
3181                 if (ret < 0) {
3182                         if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
3183                                 ret = -EFAULT;
3184                         goto out;
3185                 }
3186         }
3187         binder_debug(BINDER_DEBUG_READ_WRITE,
3188                      "%d:%d wrote %lld of %lld, read return %lld of %lld\n",
3189                      proc->pid, thread->pid,
3190                      (u64)bwr.write_consumed, (u64)bwr.write_size,
3191                      (u64)bwr.read_consumed, (u64)bwr.read_size);
3192         if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
3193                 ret = -EFAULT;
3194                 goto out;
3195         }
3196 out:
3197         return ret;
3198 }
3199
3200 static int binder_ioctl_set_ctx_mgr(struct file *filp)
3201 {
3202         int ret = 0;
3203         struct binder_proc *proc = filp->private_data;
3204         struct binder_context *context = proc->context;
3205
3206         kuid_t curr_euid = current_euid();
3207
3208         if (context->binder_context_mgr_node) {
3209                 pr_err("BINDER_SET_CONTEXT_MGR already set\n");
3210                 ret = -EBUSY;
3211                 goto out;
3212         }
3213         ret = security_binder_set_context_mgr(proc->tsk);
3214         if (ret < 0)
3215                 goto out;
3216         if (uid_valid(context->binder_context_mgr_uid)) {
3217                 if (!uid_eq(context->binder_context_mgr_uid, curr_euid)) {
3218                         pr_err("BINDER_SET_CONTEXT_MGR bad uid %d != %d\n",
3219                                from_kuid(&init_user_ns, curr_euid),
3220                                from_kuid(&init_user_ns,
3221                                          context->binder_context_mgr_uid));
3222                         ret = -EPERM;
3223                         goto out;
3224                 }
3225         } else {
3226                 context->binder_context_mgr_uid = curr_euid;
3227         }
3228         context->binder_context_mgr_node = binder_new_node(proc, 0, 0);
3229         if (!context->binder_context_mgr_node) {
3230                 ret = -ENOMEM;
3231                 goto out;
3232         }
3233         context->binder_context_mgr_node->local_weak_refs++;
3234         context->binder_context_mgr_node->local_strong_refs++;
3235         context->binder_context_mgr_node->has_strong_ref = 1;
3236         context->binder_context_mgr_node->has_weak_ref = 1;
3237 out:
3238         return ret;
3239 }
3240
3241 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
3242 {
3243         int ret;
3244         struct binder_proc *proc = filp->private_data;
3245         struct binder_thread *thread;
3246         unsigned int size = _IOC_SIZE(cmd);
3247         void __user *ubuf = (void __user *)arg;
3248
3249         /*pr_info("binder_ioctl: %d:%d %x %lx\n",
3250                         proc->pid, current->pid, cmd, arg);*/
3251
3252         trace_binder_ioctl(cmd, arg);
3253
3254         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
3255         if (ret)
3256                 goto err_unlocked;
3257
3258         binder_lock(__func__);
3259         thread = binder_get_thread(proc);
3260         if (thread == NULL) {
3261                 ret = -ENOMEM;
3262                 goto err;
3263         }
3264
3265         switch (cmd) {
3266         case BINDER_WRITE_READ:
3267                 ret = binder_ioctl_write_read(filp, cmd, arg, thread);
3268                 if (ret)
3269                         goto err;
3270                 break;
3271         case BINDER_SET_MAX_THREADS:
3272                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
3273                         ret = -EINVAL;
3274                         goto err;
3275                 }
3276                 break;
3277         case BINDER_SET_CONTEXT_MGR:
3278                 ret = binder_ioctl_set_ctx_mgr(filp);
3279                 if (ret)
3280                         goto err;
3281                 break;
3282         case BINDER_THREAD_EXIT:
3283                 binder_debug(BINDER_DEBUG_THREADS, "%d:%d exit\n",
3284                              proc->pid, thread->pid);
3285                 binder_free_thread(proc, thread);
3286                 thread = NULL;
3287                 break;
3288         case BINDER_VERSION: {
3289                 struct binder_version __user *ver = ubuf;
3290
3291                 if (size != sizeof(struct binder_version)) {
3292                         ret = -EINVAL;
3293                         goto err;
3294                 }
3295                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
3296                              &ver->protocol_version)) {
3297                         ret = -EINVAL;
3298                         goto err;
3299                 }
3300                 break;
3301         }
3302         default:
3303                 ret = -EINVAL;
3304                 goto err;
3305         }
3306         ret = 0;
3307 err:
3308         if (thread)
3309                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
3310         binder_unlock(__func__);
3311         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
3312         if (ret && ret != -ERESTARTSYS)
3313                 pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
3314 err_unlocked:
3315         trace_binder_ioctl_done(ret);
3316         return ret;
3317 }
3318
3319 static void binder_vma_open(struct vm_area_struct *vma)
3320 {
3321         struct binder_proc *proc = vma->vm_private_data;
3322
3323         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3324                      "%d open vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
3325                      proc->pid, vma->vm_start, vma->vm_end,
3326                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
3327                      (unsigned long)pgprot_val(vma->vm_page_prot));
3328 }
3329
3330 static void binder_vma_close(struct vm_area_struct *vma)
3331 {
3332         struct binder_proc *proc = vma->vm_private_data;
3333
3334         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3335                      "%d close vm area %lx-%lx (%ld K) vma %lx pagep %lx\n",
3336                      proc->pid, vma->vm_start, vma->vm_end,
3337                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
3338                      (unsigned long)pgprot_val(vma->vm_page_prot));
3339         proc->vma = NULL;
3340         proc->vma_vm_mm = NULL;
3341         binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES);
3342 }
3343
3344 static int binder_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
3345 {
3346         return VM_FAULT_SIGBUS;
3347 }
3348
3349 static const struct vm_operations_struct binder_vm_ops = {
3350         .open = binder_vma_open,
3351         .close = binder_vma_close,
3352         .fault = binder_vm_fault,
3353 };
3354
3355 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
3356 {
3357         int ret;
3358         struct vm_struct *area;
3359         struct binder_proc *proc = filp->private_data;
3360         const char *failure_string;
3361         struct binder_buffer *buffer;
3362
3363         if (proc->tsk != current)
3364                 return -EINVAL;
3365
3366         if ((vma->vm_end - vma->vm_start) > SZ_4M)
3367                 vma->vm_end = vma->vm_start + SZ_4M;
3368
3369         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3370                      "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx\n",
3371                      proc->pid, vma->vm_start, vma->vm_end,
3372                      (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags,
3373                      (unsigned long)pgprot_val(vma->vm_page_prot));
3374
3375         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
3376                 ret = -EPERM;
3377                 failure_string = "bad vm_flags";
3378                 goto err_bad_arg;
3379         }
3380         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
3381
3382         mutex_lock(&binder_mmap_lock);
3383         if (proc->buffer) {
3384                 ret = -EBUSY;
3385                 failure_string = "already mapped";
3386                 goto err_already_mapped;
3387         }
3388
3389         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
3390         if (area == NULL) {
3391                 ret = -ENOMEM;
3392                 failure_string = "get_vm_area";
3393                 goto err_get_vm_area_failed;
3394         }
3395         proc->buffer = area->addr;
3396         proc->user_buffer_offset = vma->vm_start - (uintptr_t)proc->buffer;
3397         mutex_unlock(&binder_mmap_lock);
3398
3399 #ifdef CONFIG_CPU_CACHE_VIPT
3400         if (cache_is_vipt_aliasing()) {
3401                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
3402                         pr_info("binder_mmap: %d %lx-%lx maps %p bad alignment\n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
3403                         vma->vm_start += PAGE_SIZE;
3404                 }
3405         }
3406 #endif
3407         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
3408         if (proc->pages == NULL) {
3409                 ret = -ENOMEM;
3410                 failure_string = "alloc page array";
3411                 goto err_alloc_pages_failed;
3412         }
3413         proc->buffer_size = vma->vm_end - vma->vm_start;
3414
3415         vma->vm_ops = &binder_vm_ops;
3416         vma->vm_private_data = proc;
3417
3418         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
3419                 ret = -ENOMEM;
3420                 failure_string = "alloc small buf";
3421                 goto err_alloc_small_buf_failed;
3422         }
3423         buffer = proc->buffer;
3424         INIT_LIST_HEAD(&proc->buffers);
3425         list_add(&buffer->entry, &proc->buffers);
3426         buffer->free = 1;
3427         binder_insert_free_buffer(proc, buffer);
3428         proc->free_async_space = proc->buffer_size / 2;
3429         barrier();
3430         proc->files = get_files_struct(current);
3431         proc->vma = vma;
3432         proc->vma_vm_mm = vma->vm_mm;
3433
3434         /*pr_info("binder_mmap: %d %lx-%lx maps %p\n",
3435                  proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
3436         return 0;
3437
3438 err_alloc_small_buf_failed:
3439         kfree(proc->pages);
3440         proc->pages = NULL;
3441 err_alloc_pages_failed:
3442         mutex_lock(&binder_mmap_lock);
3443         vfree(proc->buffer);
3444         proc->buffer = NULL;
3445 err_get_vm_area_failed:
3446 err_already_mapped:
3447         mutex_unlock(&binder_mmap_lock);
3448 err_bad_arg:
3449         pr_err("binder_mmap: %d %lx-%lx %s failed %d\n",
3450                proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
3451         return ret;
3452 }
3453
3454 static int binder_open(struct inode *nodp, struct file *filp)
3455 {
3456         struct binder_proc *proc;
3457         struct binder_device *binder_dev;
3458
3459         binder_debug(BINDER_DEBUG_OPEN_CLOSE, "binder_open: %d:%d\n",
3460                      current->group_leader->pid, current->pid);
3461
3462         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
3463         if (proc == NULL)
3464                 return -ENOMEM;
3465         get_task_struct(current);
3466         proc->tsk = current;
3467         INIT_LIST_HEAD(&proc->todo);
3468         init_waitqueue_head(&proc->wait);
3469         proc->default_priority = task_nice(current);
3470         binder_dev = container_of(filp->private_data, struct binder_device,
3471                                   miscdev);
3472         proc->context = &binder_dev->context;
3473
3474         binder_lock(__func__);
3475
3476         binder_stats_created(BINDER_STAT_PROC);
3477         hlist_add_head(&proc->proc_node, &binder_procs);
3478         proc->pid = current->group_leader->pid;
3479         INIT_LIST_HEAD(&proc->delivered_death);
3480         filp->private_data = proc;
3481
3482         binder_unlock(__func__);
3483
3484         if (binder_debugfs_dir_entry_proc) {
3485                 char strbuf[11];
3486
3487                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
3488                 /*
3489                  * proc debug entries are shared between contexts, so
3490                  * this will fail if the process tries to open the driver
3491                  * again with a different context. The priting code will
3492                  * anyway print all contexts that a given PID has, so this
3493                  * is not a problem.
3494                  */
3495                 proc->debugfs_entry = debugfs_create_file(strbuf, S_IRUGO,
3496                         binder_debugfs_dir_entry_proc,
3497                         (void *)(unsigned long)proc->pid,
3498                         &binder_proc_fops);
3499         }
3500
3501         return 0;
3502 }
3503
3504 static int binder_flush(struct file *filp, fl_owner_t id)
3505 {
3506         struct binder_proc *proc = filp->private_data;
3507
3508         binder_defer_work(proc, BINDER_DEFERRED_FLUSH);
3509
3510         return 0;
3511 }
3512
3513 static void binder_deferred_flush(struct binder_proc *proc)
3514 {
3515         struct rb_node *n;
3516         int wake_count = 0;
3517
3518         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
3519                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
3520
3521                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
3522                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
3523                         wake_up_interruptible(&thread->wait);
3524                         wake_count++;
3525                 }
3526         }
3527         wake_up_interruptible_all(&proc->wait);
3528
3529         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3530                      "binder_flush: %d woke %d threads\n", proc->pid,
3531                      wake_count);
3532 }
3533
3534 static int binder_release(struct inode *nodp, struct file *filp)
3535 {
3536         struct binder_proc *proc = filp->private_data;
3537
3538         debugfs_remove(proc->debugfs_entry);
3539         binder_defer_work(proc, BINDER_DEFERRED_RELEASE);
3540
3541         return 0;
3542 }
3543
3544 static int binder_node_release(struct binder_node *node, int refs)
3545 {
3546         struct binder_ref *ref;
3547         int death = 0;
3548
3549         list_del_init(&node->work.entry);
3550         binder_release_work(&node->async_todo);
3551
3552         if (hlist_empty(&node->refs)) {
3553                 kfree(node);
3554                 binder_stats_deleted(BINDER_STAT_NODE);
3555
3556                 return refs;
3557         }
3558
3559         node->proc = NULL;
3560         node->local_strong_refs = 0;
3561         node->local_weak_refs = 0;
3562         hlist_add_head(&node->dead_node, &binder_dead_nodes);
3563
3564         hlist_for_each_entry(ref, &node->refs, node_entry) {
3565                 refs++;
3566
3567                 if (!ref->death)
3568                         continue;
3569
3570                 death++;
3571
3572                 if (list_empty(&ref->death->work.entry)) {
3573                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
3574                         list_add_tail(&ref->death->work.entry,
3575                                       &ref->proc->todo);
3576                         wake_up_interruptible(&ref->proc->wait);
3577                 } else
3578                         BUG();
3579         }
3580
3581         binder_debug(BINDER_DEBUG_DEAD_BINDER,
3582                      "node %d now dead, refs %d, death %d\n",
3583                      node->debug_id, refs, death);
3584
3585         return refs;
3586 }
3587
3588 static void binder_deferred_release(struct binder_proc *proc)
3589 {
3590         struct binder_transaction *t;
3591         struct binder_context *context = proc->context;
3592         struct rb_node *n;
3593         int threads, nodes, incoming_refs, outgoing_refs, buffers,
3594                 active_transactions, page_count;
3595
3596         BUG_ON(proc->vma);
3597         BUG_ON(proc->files);
3598
3599         hlist_del(&proc->proc_node);
3600
3601         if (context->binder_context_mgr_node &&
3602             context->binder_context_mgr_node->proc == proc) {
3603                 binder_debug(BINDER_DEBUG_DEAD_BINDER,
3604                              "%s: %d context_mgr_node gone\n",
3605                              __func__, proc->pid);
3606                 context->binder_context_mgr_node = NULL;
3607         }
3608
3609         threads = 0;
3610         active_transactions = 0;
3611         while ((n = rb_first(&proc->threads))) {
3612                 struct binder_thread *thread;
3613
3614                 thread = rb_entry(n, struct binder_thread, rb_node);
3615                 threads++;
3616                 active_transactions += binder_free_thread(proc, thread);
3617         }
3618
3619         nodes = 0;
3620         incoming_refs = 0;
3621         while ((n = rb_first(&proc->nodes))) {
3622                 struct binder_node *node;
3623
3624                 node = rb_entry(n, struct binder_node, rb_node);
3625                 nodes++;
3626                 rb_erase(&node->rb_node, &proc->nodes);
3627                 incoming_refs = binder_node_release(node, incoming_refs);
3628         }
3629
3630         outgoing_refs = 0;
3631         while ((n = rb_first(&proc->refs_by_desc))) {
3632                 struct binder_ref *ref;
3633
3634                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
3635                 outgoing_refs++;
3636                 binder_delete_ref(ref);
3637         }
3638
3639         binder_release_work(&proc->todo);
3640         binder_release_work(&proc->delivered_death);
3641
3642         buffers = 0;
3643         while ((n = rb_first(&proc->allocated_buffers))) {
3644                 struct binder_buffer *buffer;
3645
3646                 buffer = rb_entry(n, struct binder_buffer, rb_node);
3647
3648                 t = buffer->transaction;
3649                 if (t) {
3650                         t->buffer = NULL;
3651                         buffer->transaction = NULL;
3652                         pr_err("release proc %d, transaction %d, not freed\n",
3653                                proc->pid, t->debug_id);
3654                         /*BUG();*/
3655                 }
3656
3657                 binder_free_buf(proc, buffer);
3658                 buffers++;
3659         }
3660
3661         binder_stats_deleted(BINDER_STAT_PROC);
3662
3663         page_count = 0;
3664         if (proc->pages) {
3665                 int i;
3666
3667                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
3668                         void *page_addr;
3669
3670                         if (!proc->pages[i])
3671                                 continue;
3672
3673                         page_addr = proc->buffer + i * PAGE_SIZE;
3674                         binder_debug(BINDER_DEBUG_BUFFER_ALLOC,
3675                                      "%s: %d: page %d at %p not freed\n",
3676                                      __func__, proc->pid, i, page_addr);
3677                         unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
3678                         __free_page(proc->pages[i]);
3679                         page_count++;
3680                 }
3681                 kfree(proc->pages);
3682                 vfree(proc->buffer);
3683         }
3684
3685         put_task_struct(proc->tsk);
3686
3687         binder_debug(BINDER_DEBUG_OPEN_CLOSE,
3688                      "%s: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d\n",
3689                      __func__, proc->pid, threads, nodes, incoming_refs,
3690                      outgoing_refs, active_transactions, buffers, page_count);
3691
3692         kfree(proc);
3693 }
3694
3695 static void binder_deferred_func(struct work_struct *work)
3696 {
3697         struct binder_proc *proc;
3698         struct files_struct *files;
3699
3700         int defer;
3701
3702         do {
3703                 binder_lock(__func__);
3704                 mutex_lock(&binder_deferred_lock);
3705                 if (!hlist_empty(&binder_deferred_list)) {
3706                         proc = hlist_entry(binder_deferred_list.first,
3707                                         struct binder_proc, deferred_work_node);
3708                         hlist_del_init(&proc->deferred_work_node);
3709                         defer = proc->deferred_work;
3710                         proc->deferred_work = 0;
3711                 } else {
3712                         proc = NULL;
3713                         defer = 0;
3714                 }
3715                 mutex_unlock(&binder_deferred_lock);
3716
3717                 files = NULL;
3718                 if (defer & BINDER_DEFERRED_PUT_FILES) {
3719                         files = proc->files;
3720                         if (files)
3721                                 proc->files = NULL;
3722                 }
3723
3724                 if (defer & BINDER_DEFERRED_FLUSH)
3725                         binder_deferred_flush(proc);
3726
3727                 if (defer & BINDER_DEFERRED_RELEASE)
3728                         binder_deferred_release(proc); /* frees proc */
3729
3730                 binder_unlock(__func__);
3731                 if (files)
3732                         put_files_struct(files);
3733         } while (proc);
3734 }
3735 static DECLARE_WORK(binder_deferred_work, binder_deferred_func);
3736
3737 static void
3738 binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
3739 {
3740         mutex_lock(&binder_deferred_lock);
3741         proc->deferred_work |= defer;
3742         if (hlist_unhashed(&proc->deferred_work_node)) {
3743                 hlist_add_head(&proc->deferred_work_node,
3744                                 &binder_deferred_list);
3745                 queue_work(binder_deferred_workqueue, &binder_deferred_work);
3746         }
3747         mutex_unlock(&binder_deferred_lock);
3748 }
3749
3750 static void print_binder_transaction(struct seq_file *m, const char *prefix,
3751                                      struct binder_transaction *t)
3752 {
3753         seq_printf(m,
3754                    "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
3755                    prefix, t->debug_id, t,
3756                    t->from ? t->from->proc->pid : 0,
3757                    t->from ? t->from->pid : 0,
3758                    t->to_proc ? t->to_proc->pid : 0,
3759                    t->to_thread ? t->to_thread->pid : 0,
3760                    t->code, t->flags, t->priority, t->need_reply);
3761         if (t->buffer == NULL) {
3762                 seq_puts(m, " buffer free\n");
3763                 return;
3764         }
3765         if (t->buffer->target_node)
3766                 seq_printf(m, " node %d",
3767                            t->buffer->target_node->debug_id);
3768         seq_printf(m, " size %zd:%zd data %p\n",
3769                    t->buffer->data_size, t->buffer->offsets_size,
3770                    t->buffer->data);
3771 }
3772
3773 static void print_binder_buffer(struct seq_file *m, const char *prefix,
3774                                 struct binder_buffer *buffer)
3775 {
3776         seq_printf(m, "%s %d: %p size %zd:%zd %s\n",
3777                    prefix, buffer->debug_id, buffer->data,
3778                    buffer->data_size, buffer->offsets_size,
3779                    buffer->transaction ? "active" : "delivered");
3780 }
3781
3782 static void print_binder_work(struct seq_file *m, const char *prefix,
3783                               const char *transaction_prefix,
3784                               struct binder_work *w)
3785 {
3786         struct binder_node *node;
3787         struct binder_transaction *t;
3788
3789         switch (w->type) {
3790         case BINDER_WORK_TRANSACTION:
3791                 t = container_of(w, struct binder_transaction, work);
3792                 print_binder_transaction(m, transaction_prefix, t);
3793                 break;
3794         case BINDER_WORK_TRANSACTION_COMPLETE:
3795                 seq_printf(m, "%stransaction complete\n", prefix);
3796                 break;
3797         case BINDER_WORK_NODE:
3798                 node = container_of(w, struct binder_node, work);
3799                 seq_printf(m, "%snode work %d: u%016llx c%016llx\n",
3800                            prefix, node->debug_id,
3801                            (u64)node->ptr, (u64)node->cookie);
3802                 break;
3803         case BINDER_WORK_DEAD_BINDER:
3804                 seq_printf(m, "%shas dead binder\n", prefix);
3805                 break;
3806         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
3807                 seq_printf(m, "%shas cleared dead binder\n", prefix);
3808                 break;
3809         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
3810                 seq_printf(m, "%shas cleared death notification\n", prefix);
3811                 break;
3812         default:
3813                 seq_printf(m, "%sunknown work: type %d\n", prefix, w->type);
3814                 break;
3815         }
3816 }
3817
3818 static void print_binder_thread(struct seq_file *m,
3819                                 struct binder_thread *thread,
3820                                 int print_always)
3821 {
3822         struct binder_transaction *t;
3823         struct binder_work *w;
3824         size_t start_pos = m->count;
3825         size_t header_pos;
3826
3827         seq_printf(m, "  thread %d: l %02x\n", thread->pid, thread->looper);
3828         header_pos = m->count;
3829         t = thread->transaction_stack;
3830         while (t) {
3831                 if (t->from == thread) {
3832                         print_binder_transaction(m,
3833                                                  "    outgoing transaction", t);
3834                         t = t->from_parent;
3835                 } else if (t->to_thread == thread) {
3836                         print_binder_transaction(m,
3837                                                  "    incoming transaction", t);
3838                         t = t->to_parent;
3839                 } else {
3840                         print_binder_transaction(m, "    bad transaction", t);
3841                         t = NULL;
3842                 }
3843         }
3844         list_for_each_entry(w, &thread->todo, entry) {
3845                 print_binder_work(m, "    ", "    pending transaction", w);
3846         }
3847         if (!print_always && m->count == header_pos)
3848                 m->count = start_pos;
3849 }
3850
3851 static void print_binder_node(struct seq_file *m, struct binder_node *node)
3852 {
3853         struct binder_ref *ref;
3854         struct binder_work *w;
3855         int count;
3856
3857         count = 0;
3858         hlist_for_each_entry(ref, &node->refs, node_entry)
3859                 count++;
3860
3861         seq_printf(m, "  node %d: u%016llx c%016llx hs %d hw %d ls %d lw %d is %d iw %d",
3862                    node->debug_id, (u64)node->ptr, (u64)node->cookie,
3863                    node->has_strong_ref, node->has_weak_ref,
3864                    node->local_strong_refs, node->local_weak_refs,
3865                    node->internal_strong_refs, count);
3866         if (count) {
3867                 seq_puts(m, " proc");
3868                 hlist_for_each_entry(ref, &node->refs, node_entry)
3869                         seq_printf(m, " %d", ref->proc->pid);
3870         }
3871         seq_puts(m, "\n");
3872         list_for_each_entry(w, &node->async_todo, entry)
3873                 print_binder_work(m, "    ",
3874                                   "    pending async transaction", w);
3875 }
3876
3877 static void print_binder_ref(struct seq_file *m, struct binder_ref *ref)
3878 {
3879         seq_printf(m, "  ref %d: desc %d %snode %d s %d w %d d %p\n",
3880                    ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
3881                    ref->node->debug_id, ref->strong, ref->weak, ref->death);
3882 }
3883
3884 static void print_binder_proc(struct seq_file *m,
3885                               struct binder_proc *proc, int print_all)
3886 {
3887         struct binder_work *w;
3888         struct rb_node *n;
3889         size_t start_pos = m->count;
3890         size_t header_pos;
3891
3892         seq_printf(m, "proc %d\n", proc->pid);
3893         seq_printf(m, "context %s\n", proc->context->name);
3894         header_pos = m->count;
3895
3896         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
3897                 print_binder_thread(m, rb_entry(n, struct binder_thread,
3898                                                 rb_node), print_all);
3899         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n)) {
3900                 struct binder_node *node = rb_entry(n, struct binder_node,
3901                                                     rb_node);
3902                 if (print_all || node->has_async_transaction)
3903                         print_binder_node(m, node);
3904         }
3905         if (print_all) {
3906                 for (n = rb_first(&proc->refs_by_desc);
3907                      n != NULL;
3908                      n = rb_next(n))
3909                         print_binder_ref(m, rb_entry(n, struct binder_ref,
3910                                                      rb_node_desc));
3911         }
3912         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
3913                 print_binder_buffer(m, "  buffer",
3914                                     rb_entry(n, struct binder_buffer, rb_node));
3915         list_for_each_entry(w, &proc->todo, entry)
3916                 print_binder_work(m, "  ", "  pending transaction", w);
3917         list_for_each_entry(w, &proc->delivered_death, entry) {
3918                 seq_puts(m, "  has delivered dead binder\n");
3919                 break;
3920         }
3921         if (!print_all && m->count == header_pos)
3922                 m->count = start_pos;
3923 }
3924
3925 static const char * const binder_return_strings[] = {
3926         "BR_ERROR",
3927         "BR_OK",
3928         "BR_TRANSACTION",
3929         "BR_REPLY",
3930         "BR_ACQUIRE_RESULT",
3931         "BR_DEAD_REPLY",
3932         "BR_TRANSACTION_COMPLETE",
3933         "BR_INCREFS",
3934         "BR_ACQUIRE",
3935         "BR_RELEASE",
3936         "BR_DECREFS",
3937         "BR_ATTEMPT_ACQUIRE",
3938         "BR_NOOP",
3939         "BR_SPAWN_LOOPER",
3940         "BR_FINISHED",
3941         "BR_DEAD_BINDER",
3942         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
3943         "BR_FAILED_REPLY"
3944 };
3945
3946 static const char * const binder_command_strings[] = {
3947         "BC_TRANSACTION",
3948         "BC_REPLY",
3949         "BC_ACQUIRE_RESULT",
3950         "BC_FREE_BUFFER",
3951         "BC_INCREFS",
3952         "BC_ACQUIRE",
3953         "BC_RELEASE",
3954         "BC_DECREFS",
3955         "BC_INCREFS_DONE",
3956         "BC_ACQUIRE_DONE",
3957         "BC_ATTEMPT_ACQUIRE",
3958         "BC_REGISTER_LOOPER",
3959         "BC_ENTER_LOOPER",
3960         "BC_EXIT_LOOPER",
3961         "BC_REQUEST_DEATH_NOTIFICATION",
3962         "BC_CLEAR_DEATH_NOTIFICATION",
3963         "BC_DEAD_BINDER_DONE",
3964         "BC_TRANSACTION_SG",
3965         "BC_REPLY_SG",
3966 };
3967
3968 static const char * const binder_objstat_strings[] = {
3969         "proc",
3970         "thread",
3971         "node",
3972         "ref",
3973         "death",
3974         "transaction",
3975         "transaction_complete"
3976 };
3977
3978 static void print_binder_stats(struct seq_file *m, const char *prefix,
3979                                struct binder_stats *stats)
3980 {
3981         int i;
3982
3983         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) !=
3984                      ARRAY_SIZE(binder_command_strings));
3985         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
3986                 if (stats->bc[i])
3987                         seq_printf(m, "%s%s: %d\n", prefix,
3988                                    binder_command_strings[i], stats->bc[i]);
3989         }
3990
3991         BUILD_BUG_ON(ARRAY_SIZE(stats->br) !=
3992                      ARRAY_SIZE(binder_return_strings));
3993         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
3994                 if (stats->br[i])
3995                         seq_printf(m, "%s%s: %d\n", prefix,
3996                                    binder_return_strings[i], stats->br[i]);
3997         }
3998
3999         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
4000                      ARRAY_SIZE(binder_objstat_strings));
4001         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) !=
4002                      ARRAY_SIZE(stats->obj_deleted));
4003         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
4004                 if (stats->obj_created[i] || stats->obj_deleted[i])
4005                         seq_printf(m, "%s%s: active %d total %d\n", prefix,
4006                                 binder_objstat_strings[i],
4007                                 stats->obj_created[i] - stats->obj_deleted[i],
4008                                 stats->obj_created[i]);
4009         }
4010 }
4011
4012 static void print_binder_proc_stats(struct seq_file *m,
4013                                     struct binder_proc *proc)
4014 {
4015         struct binder_work *w;
4016         struct rb_node *n;
4017         int count, strong, weak;
4018
4019         seq_printf(m, "proc %d\n", proc->pid);
4020         seq_printf(m, "context %s\n", proc->context->name);
4021         count = 0;
4022         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
4023                 count++;
4024         seq_printf(m, "  threads: %d\n", count);
4025         seq_printf(m, "  requested threads: %d+%d/%d\n"
4026                         "  ready threads %d\n"
4027                         "  free async space %zd\n", proc->requested_threads,
4028                         proc->requested_threads_started, proc->max_threads,
4029                         proc->ready_threads, proc->free_async_space);
4030         count = 0;
4031         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
4032                 count++;
4033         seq_printf(m, "  nodes: %d\n", count);
4034         count = 0;
4035         strong = 0;
4036         weak = 0;
4037         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
4038                 struct binder_ref *ref = rb_entry(n, struct binder_ref,
4039                                                   rb_node_desc);
4040                 count++;
4041                 strong += ref->strong;
4042                 weak += ref->weak;
4043         }
4044         seq_printf(m, "  refs: %d s %d w %d\n", count, strong, weak);
4045
4046         count = 0;
4047         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
4048                 count++;
4049         seq_printf(m, "  buffers: %d\n", count);
4050
4051         count = 0;
4052         list_for_each_entry(w, &proc->todo, entry) {
4053                 switch (w->type) {
4054                 case BINDER_WORK_TRANSACTION:
4055                         count++;
4056                         break;
4057                 default:
4058                         break;
4059                 }
4060         }
4061         seq_printf(m, "  pending transactions: %d\n", count);
4062
4063         print_binder_stats(m, "  ", &proc->stats);
4064 }
4065
4066
4067 static int binder_state_show(struct seq_file *m, void *unused)
4068 {
4069         struct binder_proc *proc;
4070         struct binder_node *node;
4071         int do_lock = !binder_debug_no_lock;
4072
4073         if (do_lock)
4074                 binder_lock(__func__);
4075
4076         seq_puts(m, "binder state:\n");
4077
4078         if (!hlist_empty(&binder_dead_nodes))
4079                 seq_puts(m, "dead nodes:\n");
4080         hlist_for_each_entry(node, &binder_dead_nodes, dead_node)
4081                 print_binder_node(m, node);
4082
4083         hlist_for_each_entry(proc, &binder_procs, proc_node)
4084                 print_binder_proc(m, proc, 1);
4085         if (do_lock)
4086                 binder_unlock(__func__);
4087         return 0;
4088 }
4089
4090 static int binder_stats_show(struct seq_file *m, void *unused)
4091 {
4092         struct binder_proc *proc;
4093         int do_lock = !binder_debug_no_lock;
4094
4095         if (do_lock)
4096                 binder_lock(__func__);
4097
4098         seq_puts(m, "binder stats:\n");
4099
4100         print_binder_stats(m, "", &binder_stats);
4101
4102         hlist_for_each_entry(proc, &binder_procs, proc_node)
4103                 print_binder_proc_stats(m, proc);
4104         if (do_lock)
4105                 binder_unlock(__func__);
4106         return 0;
4107 }
4108
4109 static int binder_transactions_show(struct seq_file *m, void *unused)
4110 {
4111         struct binder_proc *proc;
4112         int do_lock = !binder_debug_no_lock;
4113
4114         if (do_lock)
4115                 binder_lock(__func__);
4116
4117         seq_puts(m, "binder transactions:\n");
4118         hlist_for_each_entry(proc, &binder_procs, proc_node)
4119                 print_binder_proc(m, proc, 0);
4120         if (do_lock)
4121                 binder_unlock(__func__);
4122         return 0;
4123 }
4124
4125 static int binder_proc_show(struct seq_file *m, void *unused)
4126 {
4127         struct binder_proc *itr;
4128         int pid = (unsigned long)m->private;
4129         int do_lock = !binder_debug_no_lock;
4130
4131         if (do_lock)
4132                 binder_lock(__func__);
4133
4134         hlist_for_each_entry(itr, &binder_procs, proc_node) {
4135                 if (itr->pid == pid) {
4136                         seq_puts(m, "binder proc state:\n");
4137                         print_binder_proc(m, itr, 1);
4138                 }
4139         }
4140         if (do_lock)
4141                 binder_unlock(__func__);
4142         return 0;
4143 }
4144
4145 static void print_binder_transaction_log_entry(struct seq_file *m,
4146                                         struct binder_transaction_log_entry *e)
4147 {
4148         seq_printf(m,
4149                    "%d: %s from %d:%d to %d:%d context %s node %d handle %d size %d:%d\n",
4150                    e->debug_id, (e->call_type == 2) ? "reply" :
4151                    ((e->call_type == 1) ? "async" : "call "), e->from_proc,
4152                    e->from_thread, e->to_proc, e->to_thread, e->context_name,
4153                    e->to_node, e->target_handle, e->data_size, e->offsets_size);
4154 }
4155
4156 static int binder_transaction_log_show(struct seq_file *m, void *unused)
4157 {
4158         struct binder_transaction_log *log = m->private;
4159         int i;
4160
4161         if (log->full) {
4162                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++)
4163                         print_binder_transaction_log_entry(m, &log->entry[i]);
4164         }
4165         for (i = 0; i < log->next; i++)
4166                 print_binder_transaction_log_entry(m, &log->entry[i]);
4167         return 0;
4168 }
4169
4170 static const struct file_operations binder_fops = {
4171         .owner = THIS_MODULE,
4172         .poll = binder_poll,
4173         .unlocked_ioctl = binder_ioctl,
4174         .compat_ioctl = binder_ioctl,
4175         .mmap = binder_mmap,
4176         .open = binder_open,
4177         .flush = binder_flush,
4178         .release = binder_release,
4179 };
4180
4181 BINDER_DEBUG_ENTRY(state);
4182 BINDER_DEBUG_ENTRY(stats);
4183 BINDER_DEBUG_ENTRY(transactions);
4184 BINDER_DEBUG_ENTRY(transaction_log);
4185
4186 static int __init init_binder_device(const char *name)
4187 {
4188         int ret;
4189         struct binder_device *binder_device;
4190
4191         binder_device = kzalloc(sizeof(*binder_device), GFP_KERNEL);
4192         if (!binder_device)
4193                 return -ENOMEM;
4194
4195         binder_device->miscdev.fops = &binder_fops;
4196         binder_device->miscdev.minor = MISC_DYNAMIC_MINOR;
4197         binder_device->miscdev.name = name;
4198
4199         binder_device->context.binder_context_mgr_uid = INVALID_UID;
4200         binder_device->context.name = name;
4201
4202         ret = misc_register(&binder_device->miscdev);
4203         if (ret < 0) {
4204                 kfree(binder_device);
4205                 return ret;
4206         }
4207
4208         hlist_add_head(&binder_device->hlist, &binder_devices);
4209
4210         return ret;
4211 }
4212
4213 static int __init binder_init(void)
4214 {
4215         int ret;
4216         char *device_name, *device_names;
4217         struct binder_device *device;
4218         struct hlist_node *tmp;
4219
4220         binder_deferred_workqueue = create_singlethread_workqueue("binder");
4221         if (!binder_deferred_workqueue)
4222                 return -ENOMEM;
4223
4224         binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
4225         if (binder_debugfs_dir_entry_root)
4226                 binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",
4227                                                  binder_debugfs_dir_entry_root);
4228
4229         if (binder_debugfs_dir_entry_root) {
4230                 debugfs_create_file("state",
4231                                     S_IRUGO,
4232                                     binder_debugfs_dir_entry_root,
4233                                     NULL,
4234                                     &binder_state_fops);
4235                 debugfs_create_file("stats",
4236                                     S_IRUGO,
4237                                     binder_debugfs_dir_entry_root,
4238                                     NULL,
4239                                     &binder_stats_fops);
4240                 debugfs_create_file("transactions",
4241                                     S_IRUGO,
4242                                     binder_debugfs_dir_entry_root,
4243                                     NULL,
4244                                     &binder_transactions_fops);
4245                 debugfs_create_file("transaction_log",
4246                                     S_IRUGO,
4247                                     binder_debugfs_dir_entry_root,
4248                                     &binder_transaction_log,
4249                                     &binder_transaction_log_fops);
4250                 debugfs_create_file("failed_transaction_log",
4251                                     S_IRUGO,
4252                                     binder_debugfs_dir_entry_root,
4253                                     &binder_transaction_log_failed,
4254                                     &binder_transaction_log_fops);
4255         }
4256
4257         /*
4258          * Copy the module_parameter string, because we don't want to
4259          * tokenize it in-place.
4260          */
4261         device_names = kzalloc(strlen(binder_devices_param) + 1, GFP_KERNEL);
4262         if (!device_names) {
4263                 ret = -ENOMEM;
4264                 goto err_alloc_device_names_failed;
4265         }
4266         strcpy(device_names, binder_devices_param);
4267
4268         while ((device_name = strsep(&device_names, ","))) {
4269                 ret = init_binder_device(device_name);
4270                 if (ret)
4271                         goto err_init_binder_device_failed;
4272         }
4273
4274         return ret;
4275
4276 err_init_binder_device_failed:
4277         hlist_for_each_entry_safe(device, tmp, &binder_devices, hlist) {
4278                 misc_deregister(&device->miscdev);
4279                 hlist_del(&device->hlist);
4280                 kfree(device);
4281         }
4282 err_alloc_device_names_failed:
4283         debugfs_remove_recursive(binder_debugfs_dir_entry_root);
4284
4285         destroy_workqueue(binder_deferred_workqueue);
4286
4287         return ret;
4288 }
4289
4290 device_initcall(binder_init);
4291
4292 #define CREATE_TRACE_POINTS
4293 #include "binder_trace.h"
4294
4295 MODULE_LICENSE("GPL v2");