4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * proc base directory handling functions
8 * 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
9 * Instead of using magical inumbers to determine the kind of object
10 * we allocate and fill in-core inodes upon lookup. They don't even
11 * go into icache. We cache the reference to task_struct upon lookup too.
12 * Eventually it should become a filesystem in its own. We don't use the
13 * rest of procfs anymore.
19 * Bruna Moreira <bruna.moreira@indt.org.br>
20 * Edjard Mota <edjard.mota@indt.org.br>
21 * Ilias Biris <ilias.biris@indt.org.br>
22 * Mauricio Lin <mauricio.lin@indt.org.br>
24 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
26 * A new process specific entry (smaps) included in /proc. It shows the
27 * size of rss for each memory area. The maps entry lacks information
28 * about physical memory size (rss) for each mapped file, i.e.,
29 * rss information for executables and library files.
30 * This additional information is useful for any tools that need to know
31 * about physical memory consumption for a process specific library.
35 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
36 * Pud inclusion in the page table walking.
40 * 10LE Instituto Nokia de Tecnologia - INdT:
41 * A better way to walks through the page table as suggested by Hugh Dickins.
43 * Simo Piiroinen <simo.piiroinen@nokia.com>:
44 * Smaps information related to shared, private, clean and dirty pages.
46 * Paul Mundt <paul.mundt@nokia.com>:
47 * Overall revision about smaps.
50 #include <asm/uaccess.h>
52 #include <linux/errno.h>
53 #include <linux/time.h>
54 #include <linux/proc_fs.h>
55 #include <linux/stat.h>
56 #include <linux/task_io_accounting_ops.h>
57 #include <linux/init.h>
58 #include <linux/capability.h>
59 #include <linux/file.h>
60 #include <linux/fdtable.h>
61 #include <linux/string.h>
62 #include <linux/seq_file.h>
63 #include <linux/namei.h>
64 #include <linux/mnt_namespace.h>
66 #include <linux/swap.h>
67 #include <linux/rcupdate.h>
68 #include <linux/kallsyms.h>
69 #include <linux/stacktrace.h>
70 #include <linux/resource.h>
71 #include <linux/module.h>
72 #include <linux/mount.h>
73 #include <linux/security.h>
74 #include <linux/ptrace.h>
75 #include <linux/tracehook.h>
76 #include <linux/cgroup.h>
77 #include <linux/cpuset.h>
78 #include <linux/audit.h>
79 #include <linux/poll.h>
80 #include <linux/nsproxy.h>
81 #include <linux/oom.h>
82 #include <linux/elf.h>
83 #include <linux/pid_namespace.h>
84 #include <linux/fs_struct.h>
85 #include <linux/slab.h>
86 #include <linux/flex_array.h>
87 #ifdef CONFIG_HARDWALL
88 #include <asm/hardwall.h>
90 #include <trace/events/oom.h>
94 * Implementing inode permission operations in /proc is almost
95 * certainly an error. Permission checks need to happen during
96 * each system call not at open time. The reason is that most of
97 * what we wish to check for permissions in /proc varies at runtime.
99 * The classic example of a problem is opening file descriptors
100 * in /proc for a task before it execs a suid executable.
107 const struct inode_operations *iop;
108 const struct file_operations *fop;
112 #define NOD(NAME, MODE, IOP, FOP, OP) { \
114 .len = sizeof(NAME) - 1, \
121 #define DIR(NAME, MODE, iops, fops) \
122 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
123 #define LNK(NAME, get_link) \
124 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
125 &proc_pid_link_inode_operations, NULL, \
126 { .proc_get_link = get_link } )
127 #define REG(NAME, MODE, fops) \
128 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
129 #define INF(NAME, MODE, read) \
130 NOD(NAME, (S_IFREG|(MODE)), \
131 NULL, &proc_info_file_operations, \
132 { .proc_read = read } )
133 #define ONE(NAME, MODE, show) \
134 NOD(NAME, (S_IFREG|(MODE)), \
135 NULL, &proc_single_file_operations, \
136 { .proc_show = show } )
138 static int proc_fd_permission(struct inode *inode, int mask);
141 * Count the number of hardlinks for the pid_entry table, excluding the .
144 static unsigned int pid_entry_count_dirs(const struct pid_entry *entries,
151 for (i = 0; i < n; ++i) {
152 if (S_ISDIR(entries[i].mode))
159 static int get_task_root(struct task_struct *task, struct path *root)
161 int result = -ENOENT;
165 get_fs_root(task->fs, root);
172 static int proc_cwd_link(struct dentry *dentry, struct path *path)
174 struct task_struct *task = get_proc_task(dentry->d_inode);
175 int result = -ENOENT;
180 get_fs_pwd(task->fs, path);
184 put_task_struct(task);
189 static int proc_root_link(struct dentry *dentry, struct path *path)
191 struct task_struct *task = get_proc_task(dentry->d_inode);
192 int result = -ENOENT;
195 result = get_task_root(task, path);
196 put_task_struct(task);
201 static struct mm_struct *__check_mem_permission(struct task_struct *task)
203 struct mm_struct *mm;
205 mm = get_task_mm(task);
207 return ERR_PTR(-EINVAL);
210 * A task can always look at itself, in case it chooses
211 * to use system calls instead of load instructions.
217 * If current is actively ptrace'ing, and would also be
218 * permitted to freshly attach with ptrace now, permit it.
220 if (task_is_stopped_or_traced(task)) {
223 match = (ptrace_parent(task) == current);
225 if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH))
230 * No one else is allowed.
233 return ERR_PTR(-EPERM);
237 * If current may access user memory in @task return a reference to the
238 * corresponding mm, otherwise ERR_PTR.
240 static struct mm_struct *check_mem_permission(struct task_struct *task)
242 struct mm_struct *mm;
246 * Avoid racing if task exec's as we might get a new mm but validate
247 * against old credentials.
249 err = mutex_lock_killable(&task->signal->cred_guard_mutex);
253 mm = __check_mem_permission(task);
254 mutex_unlock(&task->signal->cred_guard_mutex);
259 struct mm_struct *mm_for_maps(struct task_struct *task)
261 struct mm_struct *mm;
264 err = mutex_lock_killable(&task->signal->cred_guard_mutex);
268 mm = get_task_mm(task);
269 if (mm && mm != current->mm &&
270 !ptrace_may_access(task, PTRACE_MODE_READ)) {
272 mm = ERR_PTR(-EACCES);
274 mutex_unlock(&task->signal->cred_guard_mutex);
279 static int proc_pid_cmdline(struct task_struct *task, char * buffer)
283 struct mm_struct *mm = get_task_mm(task);
287 goto out_mm; /* Shh! No looking before we're done */
289 len = mm->arg_end - mm->arg_start;
294 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
296 // If the nul at the end of args has been overwritten, then
297 // assume application is using setproctitle(3).
298 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
299 len = strnlen(buffer, res);
303 len = mm->env_end - mm->env_start;
304 if (len > PAGE_SIZE - res)
305 len = PAGE_SIZE - res;
306 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
307 res = strnlen(buffer, res);
316 static int proc_pid_auxv(struct task_struct *task, char *buffer)
318 struct mm_struct *mm = mm_for_maps(task);
319 int res = PTR_ERR(mm);
320 if (mm && !IS_ERR(mm)) {
321 unsigned int nwords = 0;
324 } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
325 res = nwords * sizeof(mm->saved_auxv[0]);
328 memcpy(buffer, mm->saved_auxv, res);
335 #ifdef CONFIG_KALLSYMS
337 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
338 * Returns the resolved symbol. If that fails, simply return the address.
340 static int proc_pid_wchan(struct task_struct *task, char *buffer)
343 char symname[KSYM_NAME_LEN];
345 wchan = get_wchan(task);
347 if (lookup_symbol_name(wchan, symname) < 0)
348 if (!ptrace_may_access(task, PTRACE_MODE_READ))
351 return sprintf(buffer, "%lu", wchan);
353 return sprintf(buffer, "%s", symname);
355 #endif /* CONFIG_KALLSYMS */
357 static int lock_trace(struct task_struct *task)
359 int err = mutex_lock_killable(&task->signal->cred_guard_mutex);
362 if (!ptrace_may_access(task, PTRACE_MODE_ATTACH)) {
363 mutex_unlock(&task->signal->cred_guard_mutex);
369 static void unlock_trace(struct task_struct *task)
371 mutex_unlock(&task->signal->cred_guard_mutex);
374 #ifdef CONFIG_STACKTRACE
376 #define MAX_STACK_TRACE_DEPTH 64
378 static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
379 struct pid *pid, struct task_struct *task)
381 struct stack_trace trace;
382 unsigned long *entries;
386 entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL);
390 trace.nr_entries = 0;
391 trace.max_entries = MAX_STACK_TRACE_DEPTH;
392 trace.entries = entries;
395 err = lock_trace(task);
397 save_stack_trace_tsk(task, &trace);
399 for (i = 0; i < trace.nr_entries; i++) {
400 seq_printf(m, "[<%pK>] %pS\n",
401 (void *)entries[i], (void *)entries[i]);
411 #ifdef CONFIG_SCHEDSTATS
413 * Provides /proc/PID/schedstat
415 static int proc_pid_schedstat(struct task_struct *task, char *buffer)
417 return sprintf(buffer, "%llu %llu %lu\n",
418 (unsigned long long)task->se.sum_exec_runtime,
419 (unsigned long long)task->sched_info.run_delay,
420 task->sched_info.pcount);
424 #ifdef CONFIG_LATENCYTOP
425 static int lstats_show_proc(struct seq_file *m, void *v)
428 struct inode *inode = m->private;
429 struct task_struct *task = get_proc_task(inode);
433 seq_puts(m, "Latency Top version : v0.1\n");
434 for (i = 0; i < 32; i++) {
435 struct latency_record *lr = &task->latency_record[i];
436 if (lr->backtrace[0]) {
438 seq_printf(m, "%i %li %li",
439 lr->count, lr->time, lr->max);
440 for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
441 unsigned long bt = lr->backtrace[q];
446 seq_printf(m, " %ps", (void *)bt);
452 put_task_struct(task);
456 static int lstats_open(struct inode *inode, struct file *file)
458 return single_open(file, lstats_show_proc, inode);
461 static ssize_t lstats_write(struct file *file, const char __user *buf,
462 size_t count, loff_t *offs)
464 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
468 clear_all_latency_tracing(task);
469 put_task_struct(task);
474 static const struct file_operations proc_lstats_operations = {
477 .write = lstats_write,
479 .release = single_release,
484 static int proc_oom_score(struct task_struct *task, char *buffer)
486 unsigned long points = 0;
488 read_lock(&tasklist_lock);
490 points = oom_badness(task, NULL, NULL,
491 totalram_pages + total_swap_pages);
492 read_unlock(&tasklist_lock);
493 return sprintf(buffer, "%lu\n", points);
501 static const struct limit_names lnames[RLIM_NLIMITS] = {
502 [RLIMIT_CPU] = {"Max cpu time", "seconds"},
503 [RLIMIT_FSIZE] = {"Max file size", "bytes"},
504 [RLIMIT_DATA] = {"Max data size", "bytes"},
505 [RLIMIT_STACK] = {"Max stack size", "bytes"},
506 [RLIMIT_CORE] = {"Max core file size", "bytes"},
507 [RLIMIT_RSS] = {"Max resident set", "bytes"},
508 [RLIMIT_NPROC] = {"Max processes", "processes"},
509 [RLIMIT_NOFILE] = {"Max open files", "files"},
510 [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
511 [RLIMIT_AS] = {"Max address space", "bytes"},
512 [RLIMIT_LOCKS] = {"Max file locks", "locks"},
513 [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
514 [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
515 [RLIMIT_NICE] = {"Max nice priority", NULL},
516 [RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
517 [RLIMIT_RTTIME] = {"Max realtime timeout", "us"},
520 /* Display limits for a process */
521 static int proc_pid_limits(struct task_struct *task, char *buffer)
526 char *bufptr = buffer;
528 struct rlimit rlim[RLIM_NLIMITS];
530 if (!lock_task_sighand(task, &flags))
532 memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
533 unlock_task_sighand(task, &flags);
536 * print the file header
538 count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n",
539 "Limit", "Soft Limit", "Hard Limit", "Units");
541 for (i = 0; i < RLIM_NLIMITS; i++) {
542 if (rlim[i].rlim_cur == RLIM_INFINITY)
543 count += sprintf(&bufptr[count], "%-25s %-20s ",
544 lnames[i].name, "unlimited");
546 count += sprintf(&bufptr[count], "%-25s %-20lu ",
547 lnames[i].name, rlim[i].rlim_cur);
549 if (rlim[i].rlim_max == RLIM_INFINITY)
550 count += sprintf(&bufptr[count], "%-20s ", "unlimited");
552 count += sprintf(&bufptr[count], "%-20lu ",
556 count += sprintf(&bufptr[count], "%-10s\n",
559 count += sprintf(&bufptr[count], "\n");
565 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
566 static int proc_pid_syscall(struct task_struct *task, char *buffer)
569 unsigned long args[6], sp, pc;
570 int res = lock_trace(task);
574 if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
575 res = sprintf(buffer, "running\n");
577 res = sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
579 res = sprintf(buffer,
580 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
582 args[0], args[1], args[2], args[3], args[4], args[5],
587 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
589 /************************************************************************/
590 /* Here the fs part begins */
591 /************************************************************************/
593 /* permission checks */
594 static int proc_fd_access_allowed(struct inode *inode)
596 struct task_struct *task;
598 /* Allow access to a task's file descriptors if it is us or we
599 * may use ptrace attach to the process and find out that
602 task = get_proc_task(inode);
604 allowed = ptrace_may_access(task, PTRACE_MODE_READ);
605 put_task_struct(task);
610 int proc_setattr(struct dentry *dentry, struct iattr *attr)
613 struct inode *inode = dentry->d_inode;
615 if (attr->ia_valid & ATTR_MODE)
618 error = inode_change_ok(inode, attr);
622 if ((attr->ia_valid & ATTR_SIZE) &&
623 attr->ia_size != i_size_read(inode)) {
624 error = vmtruncate(inode, attr->ia_size);
629 setattr_copy(inode, attr);
630 mark_inode_dirty(inode);
634 static const struct inode_operations proc_def_inode_operations = {
635 .setattr = proc_setattr,
638 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
640 static ssize_t proc_info_read(struct file * file, char __user * buf,
641 size_t count, loff_t *ppos)
643 struct inode * inode = file->f_path.dentry->d_inode;
646 struct task_struct *task = get_proc_task(inode);
652 if (count > PROC_BLOCK_SIZE)
653 count = PROC_BLOCK_SIZE;
656 if (!(page = __get_free_page(GFP_TEMPORARY)))
659 length = PROC_I(inode)->op.proc_read(task, (char*)page);
662 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
665 put_task_struct(task);
670 static const struct file_operations proc_info_file_operations = {
671 .read = proc_info_read,
672 .llseek = generic_file_llseek,
675 static int proc_single_show(struct seq_file *m, void *v)
677 struct inode *inode = m->private;
678 struct pid_namespace *ns;
680 struct task_struct *task;
683 ns = inode->i_sb->s_fs_info;
684 pid = proc_pid(inode);
685 task = get_pid_task(pid, PIDTYPE_PID);
689 ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
691 put_task_struct(task);
695 static int proc_single_open(struct inode *inode, struct file *filp)
697 return single_open(filp, proc_single_show, inode);
700 static const struct file_operations proc_single_file_operations = {
701 .open = proc_single_open,
704 .release = single_release,
707 static int mem_open(struct inode* inode, struct file* file)
709 file->private_data = (void*)((long)current->self_exec_id);
710 /* OK to pass negative loff_t, we can catch out-of-range */
711 file->f_mode |= FMODE_UNSIGNED_OFFSET;
715 static ssize_t mem_read(struct file * file, char __user * buf,
716 size_t count, loff_t *ppos)
718 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
720 unsigned long src = *ppos;
722 struct mm_struct *mm;
728 page = (char *)__get_free_page(GFP_TEMPORARY);
732 mm = check_mem_permission(task);
739 if (file->private_data != (void*)((long)current->self_exec_id))
745 int this_len, retval;
747 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
748 retval = access_remote_vm(mm, src, page, this_len, 0);
755 if (copy_to_user(buf, page, retval)) {
770 free_page((unsigned long) page);
772 put_task_struct(task);
777 static ssize_t mem_write(struct file * file, const char __user *buf,
778 size_t count, loff_t *ppos)
782 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
783 unsigned long dst = *ppos;
784 struct mm_struct *mm;
791 page = (char *)__get_free_page(GFP_TEMPORARY);
795 mm = check_mem_permission(task);
796 copied = PTR_ERR(mm);
801 if (file->private_data != (void *)((long)current->self_exec_id))
806 int this_len, retval;
808 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
809 if (copy_from_user(page, buf, this_len)) {
813 retval = access_remote_vm(mm, dst, page, this_len, 1);
829 free_page((unsigned long) page);
831 put_task_struct(task);
836 loff_t mem_lseek(struct file *file, loff_t offset, int orig)
840 file->f_pos = offset;
843 file->f_pos += offset;
848 force_successful_syscall_return();
852 static const struct file_operations proc_mem_operations = {
859 static ssize_t environ_read(struct file *file, char __user *buf,
860 size_t count, loff_t *ppos)
862 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
864 unsigned long src = *ppos;
866 struct mm_struct *mm;
872 page = (char *)__get_free_page(GFP_TEMPORARY);
877 mm = mm_for_maps(task);
879 if (!mm || IS_ERR(mm))
884 int this_len, retval, max_len;
886 this_len = mm->env_end - (mm->env_start + src);
891 max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
892 this_len = (this_len > max_len) ? max_len : this_len;
894 retval = access_process_vm(task, (mm->env_start + src),
902 if (copy_to_user(buf, page, retval)) {
916 free_page((unsigned long) page);
918 put_task_struct(task);
923 static const struct file_operations proc_environ_operations = {
924 .read = environ_read,
925 .llseek = generic_file_llseek,
928 static ssize_t oom_adjust_read(struct file *file, char __user *buf,
929 size_t count, loff_t *ppos)
931 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
932 char buffer[PROC_NUMBUF];
934 int oom_adjust = OOM_DISABLE;
940 if (lock_task_sighand(task, &flags)) {
941 oom_adjust = task->signal->oom_adj;
942 unlock_task_sighand(task, &flags);
945 put_task_struct(task);
947 len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust);
949 return simple_read_from_buffer(buf, count, ppos, buffer, len);
952 static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
953 size_t count, loff_t *ppos)
955 struct task_struct *task;
956 char buffer[PROC_NUMBUF];
961 memset(buffer, 0, sizeof(buffer));
962 if (count > sizeof(buffer) - 1)
963 count = sizeof(buffer) - 1;
964 if (copy_from_user(buffer, buf, count)) {
969 err = kstrtoint(strstrip(buffer), 0, &oom_adjust);
972 if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) &&
973 oom_adjust != OOM_DISABLE) {
978 task = get_proc_task(file->f_path.dentry->d_inode);
990 if (!lock_task_sighand(task, &flags)) {
995 if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) {
1001 * Warn that /proc/pid/oom_adj is deprecated, see
1002 * Documentation/feature-removal-schedule.txt.
1004 printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
1005 current->comm, task_pid_nr(current), task_pid_nr(task),
1007 task->signal->oom_adj = oom_adjust;
1009 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1010 * value is always attainable.
1012 if (task->signal->oom_adj == OOM_ADJUST_MAX)
1013 task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX;
1015 task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) /
1017 trace_oom_score_adj_update(task);
1019 unlock_task_sighand(task, &flags);
1022 put_task_struct(task);
1024 return err < 0 ? err : count;
1027 static const struct file_operations proc_oom_adjust_operations = {
1028 .read = oom_adjust_read,
1029 .write = oom_adjust_write,
1030 .llseek = generic_file_llseek,
1033 static ssize_t oom_score_adj_read(struct file *file, char __user *buf,
1034 size_t count, loff_t *ppos)
1036 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1037 char buffer[PROC_NUMBUF];
1038 int oom_score_adj = OOM_SCORE_ADJ_MIN;
1039 unsigned long flags;
1044 if (lock_task_sighand(task, &flags)) {
1045 oom_score_adj = task->signal->oom_score_adj;
1046 unlock_task_sighand(task, &flags);
1048 put_task_struct(task);
1049 len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj);
1050 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1053 static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
1054 size_t count, loff_t *ppos)
1056 struct task_struct *task;
1057 char buffer[PROC_NUMBUF];
1058 unsigned long flags;
1062 memset(buffer, 0, sizeof(buffer));
1063 if (count > sizeof(buffer) - 1)
1064 count = sizeof(buffer) - 1;
1065 if (copy_from_user(buffer, buf, count)) {
1070 err = kstrtoint(strstrip(buffer), 0, &oom_score_adj);
1073 if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
1074 oom_score_adj > OOM_SCORE_ADJ_MAX) {
1079 task = get_proc_task(file->f_path.dentry->d_inode);
1091 if (!lock_task_sighand(task, &flags)) {
1096 if (oom_score_adj < task->signal->oom_score_adj_min &&
1097 !capable(CAP_SYS_RESOURCE)) {
1102 task->signal->oom_score_adj = oom_score_adj;
1103 if (has_capability_noaudit(current, CAP_SYS_RESOURCE))
1104 task->signal->oom_score_adj_min = oom_score_adj;
1105 trace_oom_score_adj_update(task);
1107 * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
1108 * always attainable.
1110 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
1111 task->signal->oom_adj = OOM_DISABLE;
1113 task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) /
1116 unlock_task_sighand(task, &flags);
1119 put_task_struct(task);
1121 return err < 0 ? err : count;
1124 static const struct file_operations proc_oom_score_adj_operations = {
1125 .read = oom_score_adj_read,
1126 .write = oom_score_adj_write,
1127 .llseek = default_llseek,
1130 #ifdef CONFIG_AUDITSYSCALL
1131 #define TMPBUFLEN 21
1132 static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
1133 size_t count, loff_t *ppos)
1135 struct inode * inode = file->f_path.dentry->d_inode;
1136 struct task_struct *task = get_proc_task(inode);
1138 char tmpbuf[TMPBUFLEN];
1142 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1143 audit_get_loginuid(task));
1144 put_task_struct(task);
1145 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1148 static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1149 size_t count, loff_t *ppos)
1151 struct inode * inode = file->f_path.dentry->d_inode;
1156 if (!capable(CAP_AUDIT_CONTROL))
1160 if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
1166 if (count >= PAGE_SIZE)
1167 count = PAGE_SIZE - 1;
1170 /* No partial writes. */
1173 page = (char*)__get_free_page(GFP_TEMPORARY);
1177 if (copy_from_user(page, buf, count))
1181 loginuid = simple_strtoul(page, &tmp, 10);
1187 length = audit_set_loginuid(current, loginuid);
1188 if (likely(length == 0))
1192 free_page((unsigned long) page);
1196 static const struct file_operations proc_loginuid_operations = {
1197 .read = proc_loginuid_read,
1198 .write = proc_loginuid_write,
1199 .llseek = generic_file_llseek,
1202 static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
1203 size_t count, loff_t *ppos)
1205 struct inode * inode = file->f_path.dentry->d_inode;
1206 struct task_struct *task = get_proc_task(inode);
1208 char tmpbuf[TMPBUFLEN];
1212 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1213 audit_get_sessionid(task));
1214 put_task_struct(task);
1215 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1218 static const struct file_operations proc_sessionid_operations = {
1219 .read = proc_sessionid_read,
1220 .llseek = generic_file_llseek,
1224 #ifdef CONFIG_FAULT_INJECTION
1225 static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
1226 size_t count, loff_t *ppos)
1228 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
1229 char buffer[PROC_NUMBUF];
1235 make_it_fail = task->make_it_fail;
1236 put_task_struct(task);
1238 len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
1240 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1243 static ssize_t proc_fault_inject_write(struct file * file,
1244 const char __user * buf, size_t count, loff_t *ppos)
1246 struct task_struct *task;
1247 char buffer[PROC_NUMBUF], *end;
1250 if (!capable(CAP_SYS_RESOURCE))
1252 memset(buffer, 0, sizeof(buffer));
1253 if (count > sizeof(buffer) - 1)
1254 count = sizeof(buffer) - 1;
1255 if (copy_from_user(buffer, buf, count))
1257 make_it_fail = simple_strtol(strstrip(buffer), &end, 0);
1260 task = get_proc_task(file->f_dentry->d_inode);
1263 task->make_it_fail = make_it_fail;
1264 put_task_struct(task);
1269 static const struct file_operations proc_fault_inject_operations = {
1270 .read = proc_fault_inject_read,
1271 .write = proc_fault_inject_write,
1272 .llseek = generic_file_llseek,
1277 #ifdef CONFIG_SCHED_DEBUG
1279 * Print out various scheduling related per-task fields:
1281 static int sched_show(struct seq_file *m, void *v)
1283 struct inode *inode = m->private;
1284 struct task_struct *p;
1286 p = get_proc_task(inode);
1289 proc_sched_show_task(p, m);
1297 sched_write(struct file *file, const char __user *buf,
1298 size_t count, loff_t *offset)
1300 struct inode *inode = file->f_path.dentry->d_inode;
1301 struct task_struct *p;
1303 p = get_proc_task(inode);
1306 proc_sched_set_task(p);
1313 static int sched_open(struct inode *inode, struct file *filp)
1315 return single_open(filp, sched_show, inode);
1318 static const struct file_operations proc_pid_sched_operations = {
1321 .write = sched_write,
1322 .llseek = seq_lseek,
1323 .release = single_release,
1328 #ifdef CONFIG_SCHED_AUTOGROUP
1330 * Print out autogroup related information:
1332 static int sched_autogroup_show(struct seq_file *m, void *v)
1334 struct inode *inode = m->private;
1335 struct task_struct *p;
1337 p = get_proc_task(inode);
1340 proc_sched_autogroup_show_task(p, m);
1348 sched_autogroup_write(struct file *file, const char __user *buf,
1349 size_t count, loff_t *offset)
1351 struct inode *inode = file->f_path.dentry->d_inode;
1352 struct task_struct *p;
1353 char buffer[PROC_NUMBUF];
1357 memset(buffer, 0, sizeof(buffer));
1358 if (count > sizeof(buffer) - 1)
1359 count = sizeof(buffer) - 1;
1360 if (copy_from_user(buffer, buf, count))
1363 err = kstrtoint(strstrip(buffer), 0, &nice);
1367 p = get_proc_task(inode);
1372 err = proc_sched_autogroup_set_nice(p, &err);
1381 static int sched_autogroup_open(struct inode *inode, struct file *filp)
1385 ret = single_open(filp, sched_autogroup_show, NULL);
1387 struct seq_file *m = filp->private_data;
1394 static const struct file_operations proc_pid_sched_autogroup_operations = {
1395 .open = sched_autogroup_open,
1397 .write = sched_autogroup_write,
1398 .llseek = seq_lseek,
1399 .release = single_release,
1402 #endif /* CONFIG_SCHED_AUTOGROUP */
1404 static ssize_t comm_write(struct file *file, const char __user *buf,
1405 size_t count, loff_t *offset)
1407 struct inode *inode = file->f_path.dentry->d_inode;
1408 struct task_struct *p;
1409 char buffer[TASK_COMM_LEN];
1411 memset(buffer, 0, sizeof(buffer));
1412 if (count > sizeof(buffer) - 1)
1413 count = sizeof(buffer) - 1;
1414 if (copy_from_user(buffer, buf, count))
1417 p = get_proc_task(inode);
1421 if (same_thread_group(current, p))
1422 set_task_comm(p, buffer);
1431 static int comm_show(struct seq_file *m, void *v)
1433 struct inode *inode = m->private;
1434 struct task_struct *p;
1436 p = get_proc_task(inode);
1441 seq_printf(m, "%s\n", p->comm);
1449 static int comm_open(struct inode *inode, struct file *filp)
1451 return single_open(filp, comm_show, inode);
1454 static const struct file_operations proc_pid_set_comm_operations = {
1457 .write = comm_write,
1458 .llseek = seq_lseek,
1459 .release = single_release,
1462 static int proc_exe_link(struct dentry *dentry, struct path *exe_path)
1464 struct task_struct *task;
1465 struct mm_struct *mm;
1466 struct file *exe_file;
1468 task = get_proc_task(dentry->d_inode);
1471 mm = get_task_mm(task);
1472 put_task_struct(task);
1475 exe_file = get_mm_exe_file(mm);
1478 *exe_path = exe_file->f_path;
1479 path_get(&exe_file->f_path);
1486 static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
1488 struct inode *inode = dentry->d_inode;
1489 int error = -EACCES;
1491 /* We don't need a base pointer in the /proc filesystem */
1492 path_put(&nd->path);
1494 /* Are we allowed to snoop on the tasks file descriptors? */
1495 if (!proc_fd_access_allowed(inode))
1498 error = PROC_I(inode)->op.proc_get_link(dentry, &nd->path);
1500 return ERR_PTR(error);
1503 static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
1505 char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
1512 pathname = d_path(path, tmp, PAGE_SIZE);
1513 len = PTR_ERR(pathname);
1514 if (IS_ERR(pathname))
1516 len = tmp + PAGE_SIZE - 1 - pathname;
1520 if (copy_to_user(buffer, pathname, len))
1523 free_page((unsigned long)tmp);
1527 static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1529 int error = -EACCES;
1530 struct inode *inode = dentry->d_inode;
1533 /* Are we allowed to snoop on the tasks file descriptors? */
1534 if (!proc_fd_access_allowed(inode))
1537 error = PROC_I(inode)->op.proc_get_link(dentry, &path);
1541 error = do_proc_readlink(&path, buffer, buflen);
1547 static const struct inode_operations proc_pid_link_inode_operations = {
1548 .readlink = proc_pid_readlink,
1549 .follow_link = proc_pid_follow_link,
1550 .setattr = proc_setattr,
1554 /* building an inode */
1556 static int task_dumpable(struct task_struct *task)
1559 struct mm_struct *mm;
1564 dumpable = get_dumpable(mm);
1571 struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)
1573 struct inode * inode;
1574 struct proc_inode *ei;
1575 const struct cred *cred;
1577 /* We need a new inode */
1579 inode = new_inode(sb);
1585 inode->i_ino = get_next_ino();
1586 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1587 inode->i_op = &proc_def_inode_operations;
1590 * grab the reference to task.
1592 ei->pid = get_task_pid(task, PIDTYPE_PID);
1596 if (task_dumpable(task)) {
1598 cred = __task_cred(task);
1599 inode->i_uid = cred->euid;
1600 inode->i_gid = cred->egid;
1603 security_task_to_inode(task, inode);
1613 int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1615 struct inode *inode = dentry->d_inode;
1616 struct task_struct *task;
1617 const struct cred *cred;
1619 generic_fillattr(inode, stat);
1624 task = pid_task(proc_pid(inode), PIDTYPE_PID);
1626 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1627 task_dumpable(task)) {
1628 cred = __task_cred(task);
1629 stat->uid = cred->euid;
1630 stat->gid = cred->egid;
1640 * Exceptional case: normally we are not allowed to unhash a busy
1641 * directory. In this case, however, we can do it - no aliasing problems
1642 * due to the way we treat inodes.
1644 * Rewrite the inode's ownerships here because the owning task may have
1645 * performed a setuid(), etc.
1647 * Before the /proc/pid/status file was created the only way to read
1648 * the effective uid of a /process was to stat /proc/pid. Reading
1649 * /proc/pid/status is slow enough that procps and other packages
1650 * kept stating /proc/pid. To keep the rules in /proc simple I have
1651 * made this apply to all per process world readable and executable
1654 int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1656 struct inode *inode;
1657 struct task_struct *task;
1658 const struct cred *cred;
1660 if (nd && nd->flags & LOOKUP_RCU)
1663 inode = dentry->d_inode;
1664 task = get_proc_task(inode);
1667 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1668 task_dumpable(task)) {
1670 cred = __task_cred(task);
1671 inode->i_uid = cred->euid;
1672 inode->i_gid = cred->egid;
1678 inode->i_mode &= ~(S_ISUID | S_ISGID);
1679 security_task_to_inode(task, inode);
1680 put_task_struct(task);
1687 static int pid_delete_dentry(const struct dentry * dentry)
1689 /* Is the task we represent dead?
1690 * If so, then don't put the dentry on the lru list,
1691 * kill it immediately.
1693 return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
1696 const struct dentry_operations pid_dentry_operations =
1698 .d_revalidate = pid_revalidate,
1699 .d_delete = pid_delete_dentry,
1705 * Fill a directory entry.
1707 * If possible create the dcache entry and derive our inode number and
1708 * file type from dcache entry.
1710 * Since all of the proc inode numbers are dynamically generated, the inode
1711 * numbers do not exist until the inode is cache. This means creating the
1712 * the dcache entry in readdir is necessary to keep the inode numbers
1713 * reported by readdir in sync with the inode numbers reported
1716 int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
1717 const char *name, int len,
1718 instantiate_t instantiate, struct task_struct *task, const void *ptr)
1720 struct dentry *child, *dir = filp->f_path.dentry;
1721 struct inode *inode;
1724 unsigned type = DT_UNKNOWN;
1728 qname.hash = full_name_hash(name, len);
1730 child = d_lookup(dir, &qname);
1733 new = d_alloc(dir, &qname);
1735 child = instantiate(dir->d_inode, new, task, ptr);
1742 if (!child || IS_ERR(child) || !child->d_inode)
1743 goto end_instantiate;
1744 inode = child->d_inode;
1747 type = inode->i_mode >> 12;
1752 ino = find_inode_number(dir, &qname);
1755 return filldir(dirent, name, len, filp->f_pos, ino, type);
1758 static unsigned name_to_int(struct dentry *dentry)
1760 const char *name = dentry->d_name.name;
1761 int len = dentry->d_name.len;
1764 if (len > 1 && *name == '0')
1767 unsigned c = *name++ - '0';
1770 if (n >= (~0U-9)/10)
1780 #define PROC_FDINFO_MAX 64
1782 static int proc_fd_info(struct inode *inode, struct path *path, char *info)
1784 struct task_struct *task = get_proc_task(inode);
1785 struct files_struct *files = NULL;
1787 int fd = proc_fd(inode);
1790 files = get_files_struct(task);
1791 put_task_struct(task);
1795 * We are not taking a ref to the file structure, so we must
1798 spin_lock(&files->file_lock);
1799 file = fcheck_files(files, fd);
1801 unsigned int f_flags;
1802 struct fdtable *fdt;
1804 fdt = files_fdtable(files);
1805 f_flags = file->f_flags & ~O_CLOEXEC;
1806 if (FD_ISSET(fd, fdt->close_on_exec))
1807 f_flags |= O_CLOEXEC;
1810 *path = file->f_path;
1811 path_get(&file->f_path);
1814 snprintf(info, PROC_FDINFO_MAX,
1817 (long long) file->f_pos,
1819 spin_unlock(&files->file_lock);
1820 put_files_struct(files);
1823 spin_unlock(&files->file_lock);
1824 put_files_struct(files);
1829 static int proc_fd_link(struct dentry *dentry, struct path *path)
1831 return proc_fd_info(dentry->d_inode, path, NULL);
1834 static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1836 struct inode *inode;
1837 struct task_struct *task;
1839 struct files_struct *files;
1840 const struct cred *cred;
1842 if (nd && nd->flags & LOOKUP_RCU)
1845 inode = dentry->d_inode;
1846 task = get_proc_task(inode);
1847 fd = proc_fd(inode);
1850 files = get_files_struct(task);
1853 if (fcheck_files(files, fd)) {
1855 put_files_struct(files);
1856 if (task_dumpable(task)) {
1858 cred = __task_cred(task);
1859 inode->i_uid = cred->euid;
1860 inode->i_gid = cred->egid;
1866 inode->i_mode &= ~(S_ISUID | S_ISGID);
1867 security_task_to_inode(task, inode);
1868 put_task_struct(task);
1872 put_files_struct(files);
1874 put_task_struct(task);
1880 static const struct dentry_operations tid_fd_dentry_operations =
1882 .d_revalidate = tid_fd_revalidate,
1883 .d_delete = pid_delete_dentry,
1886 static struct dentry *proc_fd_instantiate(struct inode *dir,
1887 struct dentry *dentry, struct task_struct *task, const void *ptr)
1889 unsigned fd = *(const unsigned *)ptr;
1891 struct files_struct *files;
1892 struct inode *inode;
1893 struct proc_inode *ei;
1894 struct dentry *error = ERR_PTR(-ENOENT);
1896 inode = proc_pid_make_inode(dir->i_sb, task);
1901 files = get_files_struct(task);
1904 inode->i_mode = S_IFLNK;
1907 * We are not taking a ref to the file structure, so we must
1910 spin_lock(&files->file_lock);
1911 file = fcheck_files(files, fd);
1914 if (file->f_mode & FMODE_READ)
1915 inode->i_mode |= S_IRUSR | S_IXUSR;
1916 if (file->f_mode & FMODE_WRITE)
1917 inode->i_mode |= S_IWUSR | S_IXUSR;
1918 spin_unlock(&files->file_lock);
1919 put_files_struct(files);
1921 inode->i_op = &proc_pid_link_inode_operations;
1923 ei->op.proc_get_link = proc_fd_link;
1924 d_set_d_op(dentry, &tid_fd_dentry_operations);
1925 d_add(dentry, inode);
1926 /* Close the race of the process dying before we return the dentry */
1927 if (tid_fd_revalidate(dentry, NULL))
1933 spin_unlock(&files->file_lock);
1934 put_files_struct(files);
1940 static struct dentry *proc_lookupfd_common(struct inode *dir,
1941 struct dentry *dentry,
1942 instantiate_t instantiate)
1944 struct task_struct *task = get_proc_task(dir);
1945 unsigned fd = name_to_int(dentry);
1946 struct dentry *result = ERR_PTR(-ENOENT);
1953 result = instantiate(dir, dentry, task, &fd);
1955 put_task_struct(task);
1960 static int proc_readfd_common(struct file * filp, void * dirent,
1961 filldir_t filldir, instantiate_t instantiate)
1963 struct dentry *dentry = filp->f_path.dentry;
1964 struct inode *inode = dentry->d_inode;
1965 struct task_struct *p = get_proc_task(inode);
1966 unsigned int fd, ino;
1968 struct files_struct * files;
1978 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
1982 ino = parent_ino(dentry);
1983 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
1987 files = get_files_struct(p);
1991 for (fd = filp->f_pos-2;
1992 fd < files_fdtable(files)->max_fds;
1993 fd++, filp->f_pos++) {
1994 char name[PROC_NUMBUF];
1997 if (!fcheck_files(files, fd))
2001 len = snprintf(name, sizeof(name), "%d", fd);
2002 if (proc_fill_cache(filp, dirent, filldir,
2003 name, len, instantiate,
2011 put_files_struct(files);
2019 static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
2020 struct nameidata *nd)
2022 return proc_lookupfd_common(dir, dentry, proc_fd_instantiate);
2025 static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir)
2027 return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate);
2030 static ssize_t proc_fdinfo_read(struct file *file, char __user *buf,
2031 size_t len, loff_t *ppos)
2033 char tmp[PROC_FDINFO_MAX];
2034 int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp);
2036 err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp));
2040 static const struct file_operations proc_fdinfo_file_operations = {
2041 .open = nonseekable_open,
2042 .read = proc_fdinfo_read,
2043 .llseek = no_llseek,
2046 static const struct file_operations proc_fd_operations = {
2047 .read = generic_read_dir,
2048 .readdir = proc_readfd,
2049 .llseek = default_llseek,
2052 #ifdef CONFIG_CHECKPOINT_RESTORE
2055 * dname_to_vma_addr - maps a dentry name into two unsigned longs
2056 * which represent vma start and end addresses.
2058 static int dname_to_vma_addr(struct dentry *dentry,
2059 unsigned long *start, unsigned long *end)
2061 if (sscanf(dentry->d_name.name, "%lx-%lx", start, end) != 2)
2067 static int map_files_d_revalidate(struct dentry *dentry, struct nameidata *nd)
2069 unsigned long vm_start, vm_end;
2070 bool exact_vma_exists = false;
2071 struct mm_struct *mm = NULL;
2072 struct task_struct *task;
2073 const struct cred *cred;
2074 struct inode *inode;
2077 if (nd && nd->flags & LOOKUP_RCU)
2080 if (!capable(CAP_SYS_ADMIN)) {
2085 inode = dentry->d_inode;
2086 task = get_proc_task(inode);
2090 if (!ptrace_may_access(task, PTRACE_MODE_READ))
2093 mm = get_task_mm(task);
2097 if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) {
2098 down_read(&mm->mmap_sem);
2099 exact_vma_exists = !!find_exact_vma(mm, vm_start, vm_end);
2100 up_read(&mm->mmap_sem);
2105 if (exact_vma_exists) {
2106 if (task_dumpable(task)) {
2108 cred = __task_cred(task);
2109 inode->i_uid = cred->euid;
2110 inode->i_gid = cred->egid;
2116 security_task_to_inode(task, inode);
2121 put_task_struct(task);
2130 static const struct dentry_operations tid_map_files_dentry_operations = {
2131 .d_revalidate = map_files_d_revalidate,
2132 .d_delete = pid_delete_dentry,
2135 static int proc_map_files_get_link(struct dentry *dentry, struct path *path)
2137 unsigned long vm_start, vm_end;
2138 struct vm_area_struct *vma;
2139 struct task_struct *task;
2140 struct mm_struct *mm;
2144 task = get_proc_task(dentry->d_inode);
2148 mm = get_task_mm(task);
2149 put_task_struct(task);
2153 rc = dname_to_vma_addr(dentry, &vm_start, &vm_end);
2157 down_read(&mm->mmap_sem);
2158 vma = find_exact_vma(mm, vm_start, vm_end);
2159 if (vma && vma->vm_file) {
2160 *path = vma->vm_file->f_path;
2164 up_read(&mm->mmap_sem);
2172 struct map_files_info {
2175 unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
2178 static struct dentry *
2179 proc_map_files_instantiate(struct inode *dir, struct dentry *dentry,
2180 struct task_struct *task, const void *ptr)
2182 const struct file *file = ptr;
2183 struct proc_inode *ei;
2184 struct inode *inode;
2187 return ERR_PTR(-ENOENT);
2189 inode = proc_pid_make_inode(dir->i_sb, task);
2191 return ERR_PTR(-ENOENT);
2194 ei->op.proc_get_link = proc_map_files_get_link;
2196 inode->i_op = &proc_pid_link_inode_operations;
2198 inode->i_mode = S_IFLNK;
2200 if (file->f_mode & FMODE_READ)
2201 inode->i_mode |= S_IRUSR;
2202 if (file->f_mode & FMODE_WRITE)
2203 inode->i_mode |= S_IWUSR;
2205 d_set_d_op(dentry, &tid_map_files_dentry_operations);
2206 d_add(dentry, inode);
2211 static struct dentry *proc_map_files_lookup(struct inode *dir,
2212 struct dentry *dentry, struct nameidata *nd)
2214 unsigned long vm_start, vm_end;
2215 struct vm_area_struct *vma;
2216 struct task_struct *task;
2217 struct dentry *result;
2218 struct mm_struct *mm;
2220 result = ERR_PTR(-EACCES);
2221 if (!capable(CAP_SYS_ADMIN))
2224 result = ERR_PTR(-ENOENT);
2225 task = get_proc_task(dir);
2229 result = ERR_PTR(-EACCES);
2230 if (lock_trace(task))
2233 result = ERR_PTR(-ENOENT);
2234 if (dname_to_vma_addr(dentry, &vm_start, &vm_end))
2237 mm = get_task_mm(task);
2241 down_read(&mm->mmap_sem);
2242 vma = find_exact_vma(mm, vm_start, vm_end);
2246 result = proc_map_files_instantiate(dir, dentry, task, vma->vm_file);
2249 up_read(&mm->mmap_sem);
2254 put_task_struct(task);
2259 static const struct inode_operations proc_map_files_inode_operations = {
2260 .lookup = proc_map_files_lookup,
2261 .permission = proc_fd_permission,
2262 .setattr = proc_setattr,
2266 proc_map_files_readdir(struct file *filp, void *dirent, filldir_t filldir)
2268 struct dentry *dentry = filp->f_path.dentry;
2269 struct inode *inode = dentry->d_inode;
2270 struct vm_area_struct *vma;
2271 struct task_struct *task;
2272 struct mm_struct *mm;
2277 if (!capable(CAP_SYS_ADMIN))
2281 task = get_proc_task(inode);
2286 if (lock_trace(task))
2290 switch (filp->f_pos) {
2293 if (filldir(dirent, ".", 1, 0, ino, DT_DIR) < 0)
2297 ino = parent_ino(dentry);
2298 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
2303 unsigned long nr_files, pos, i;
2304 struct flex_array *fa = NULL;
2305 struct map_files_info info;
2306 struct map_files_info *p;
2308 mm = get_task_mm(task);
2311 down_read(&mm->mmap_sem);
2316 * We need two passes here:
2318 * 1) Collect vmas of mapped files with mmap_sem taken
2319 * 2) Release mmap_sem and instantiate entries
2321 * otherwise we get lockdep complained, since filldir()
2322 * routine might require mmap_sem taken in might_fault().
2325 for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) {
2326 if (vma->vm_file && ++pos > filp->f_pos)
2331 fa = flex_array_alloc(sizeof(info), nr_files,
2333 if (!fa || flex_array_prealloc(fa, 0, nr_files,
2337 flex_array_free(fa);
2338 up_read(&mm->mmap_sem);
2342 for (i = 0, vma = mm->mmap, pos = 2; vma;
2343 vma = vma->vm_next) {
2346 if (++pos <= filp->f_pos)
2349 get_file(vma->vm_file);
2350 info.file = vma->vm_file;
2351 info.len = snprintf(info.name,
2352 sizeof(info.name), "%lx-%lx",
2353 vma->vm_start, vma->vm_end);
2354 if (flex_array_put(fa, i++, &info, GFP_KERNEL))
2358 up_read(&mm->mmap_sem);
2360 for (i = 0; i < nr_files; i++) {
2361 p = flex_array_get(fa, i);
2362 ret = proc_fill_cache(filp, dirent, filldir,
2364 proc_map_files_instantiate,
2371 for (; i < nr_files; i++) {
2373 * In case of error don't forget
2374 * to put rest of file refs.
2376 p = flex_array_get(fa, i);
2380 flex_array_free(fa);
2388 put_task_struct(task);
2393 static const struct file_operations proc_map_files_operations = {
2394 .read = generic_read_dir,
2395 .readdir = proc_map_files_readdir,
2396 .llseek = default_llseek,
2399 #endif /* CONFIG_CHECKPOINT_RESTORE */
2402 * /proc/pid/fd needs a special permission handler so that a process can still
2403 * access /proc/self/fd after it has executed a setuid().
2405 static int proc_fd_permission(struct inode *inode, int mask)
2407 int rv = generic_permission(inode, mask);
2410 if (task_pid(current) == proc_pid(inode))
2416 * proc directories can do almost nothing..
2418 static const struct inode_operations proc_fd_inode_operations = {
2419 .lookup = proc_lookupfd,
2420 .permission = proc_fd_permission,
2421 .setattr = proc_setattr,
2424 static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
2425 struct dentry *dentry, struct task_struct *task, const void *ptr)
2427 unsigned fd = *(unsigned *)ptr;
2428 struct inode *inode;
2429 struct proc_inode *ei;
2430 struct dentry *error = ERR_PTR(-ENOENT);
2432 inode = proc_pid_make_inode(dir->i_sb, task);
2437 inode->i_mode = S_IFREG | S_IRUSR;
2438 inode->i_fop = &proc_fdinfo_file_operations;
2439 d_set_d_op(dentry, &tid_fd_dentry_operations);
2440 d_add(dentry, inode);
2441 /* Close the race of the process dying before we return the dentry */
2442 if (tid_fd_revalidate(dentry, NULL))
2449 static struct dentry *proc_lookupfdinfo(struct inode *dir,
2450 struct dentry *dentry,
2451 struct nameidata *nd)
2453 return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate);
2456 static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir)
2458 return proc_readfd_common(filp, dirent, filldir,
2459 proc_fdinfo_instantiate);
2462 static const struct file_operations proc_fdinfo_operations = {
2463 .read = generic_read_dir,
2464 .readdir = proc_readfdinfo,
2465 .llseek = default_llseek,
2469 * proc directories can do almost nothing..
2471 static const struct inode_operations proc_fdinfo_inode_operations = {
2472 .lookup = proc_lookupfdinfo,
2473 .setattr = proc_setattr,
2477 static struct dentry *proc_pident_instantiate(struct inode *dir,
2478 struct dentry *dentry, struct task_struct *task, const void *ptr)
2480 const struct pid_entry *p = ptr;
2481 struct inode *inode;
2482 struct proc_inode *ei;
2483 struct dentry *error = ERR_PTR(-ENOENT);
2485 inode = proc_pid_make_inode(dir->i_sb, task);
2490 inode->i_mode = p->mode;
2491 if (S_ISDIR(inode->i_mode))
2492 set_nlink(inode, 2); /* Use getattr to fix if necessary */
2494 inode->i_op = p->iop;
2496 inode->i_fop = p->fop;
2498 d_set_d_op(dentry, &pid_dentry_operations);
2499 d_add(dentry, inode);
2500 /* Close the race of the process dying before we return the dentry */
2501 if (pid_revalidate(dentry, NULL))
2507 static struct dentry *proc_pident_lookup(struct inode *dir,
2508 struct dentry *dentry,
2509 const struct pid_entry *ents,
2512 struct dentry *error;
2513 struct task_struct *task = get_proc_task(dir);
2514 const struct pid_entry *p, *last;
2516 error = ERR_PTR(-ENOENT);
2522 * Yes, it does not scale. And it should not. Don't add
2523 * new entries into /proc/<tgid>/ without very good reasons.
2525 last = &ents[nents - 1];
2526 for (p = ents; p <= last; p++) {
2527 if (p->len != dentry->d_name.len)
2529 if (!memcmp(dentry->d_name.name, p->name, p->len))
2535 error = proc_pident_instantiate(dir, dentry, task, p);
2537 put_task_struct(task);
2542 static int proc_pident_fill_cache(struct file *filp, void *dirent,
2543 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
2545 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2546 proc_pident_instantiate, task, p);
2549 static int proc_pident_readdir(struct file *filp,
2550 void *dirent, filldir_t filldir,
2551 const struct pid_entry *ents, unsigned int nents)
2554 struct dentry *dentry = filp->f_path.dentry;
2555 struct inode *inode = dentry->d_inode;
2556 struct task_struct *task = get_proc_task(inode);
2557 const struct pid_entry *p, *last;
2570 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
2576 ino = parent_ino(dentry);
2577 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
2589 last = &ents[nents - 1];
2591 if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0)
2600 put_task_struct(task);
2605 #ifdef CONFIG_SECURITY
2606 static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
2607 size_t count, loff_t *ppos)
2609 struct inode * inode = file->f_path.dentry->d_inode;
2612 struct task_struct *task = get_proc_task(inode);
2617 length = security_getprocattr(task,
2618 (char*)file->f_path.dentry->d_name.name,
2620 put_task_struct(task);
2622 length = simple_read_from_buffer(buf, count, ppos, p, length);
2627 static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
2628 size_t count, loff_t *ppos)
2630 struct inode * inode = file->f_path.dentry->d_inode;
2633 struct task_struct *task = get_proc_task(inode);
2638 if (count > PAGE_SIZE)
2641 /* No partial writes. */
2647 page = (char*)__get_free_page(GFP_TEMPORARY);
2652 if (copy_from_user(page, buf, count))
2655 /* Guard against adverse ptrace interaction */
2656 length = mutex_lock_interruptible(&task->signal->cred_guard_mutex);
2660 length = security_setprocattr(task,
2661 (char*)file->f_path.dentry->d_name.name,
2662 (void*)page, count);
2663 mutex_unlock(&task->signal->cred_guard_mutex);
2665 free_page((unsigned long) page);
2667 put_task_struct(task);
2672 static const struct file_operations proc_pid_attr_operations = {
2673 .read = proc_pid_attr_read,
2674 .write = proc_pid_attr_write,
2675 .llseek = generic_file_llseek,
2678 static const struct pid_entry attr_dir_stuff[] = {
2679 REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2680 REG("prev", S_IRUGO, proc_pid_attr_operations),
2681 REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2682 REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2683 REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2684 REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2687 static int proc_attr_dir_readdir(struct file * filp,
2688 void * dirent, filldir_t filldir)
2690 return proc_pident_readdir(filp,dirent,filldir,
2691 attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff));
2694 static const struct file_operations proc_attr_dir_operations = {
2695 .read = generic_read_dir,
2696 .readdir = proc_attr_dir_readdir,
2697 .llseek = default_llseek,
2700 static struct dentry *proc_attr_dir_lookup(struct inode *dir,
2701 struct dentry *dentry, struct nameidata *nd)
2703 return proc_pident_lookup(dir, dentry,
2704 attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
2707 static const struct inode_operations proc_attr_dir_inode_operations = {
2708 .lookup = proc_attr_dir_lookup,
2709 .getattr = pid_getattr,
2710 .setattr = proc_setattr,
2715 #ifdef CONFIG_ELF_CORE
2716 static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
2717 size_t count, loff_t *ppos)
2719 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
2720 struct mm_struct *mm;
2721 char buffer[PROC_NUMBUF];
2729 mm = get_task_mm(task);
2731 len = snprintf(buffer, sizeof(buffer), "%08lx\n",
2732 ((mm->flags & MMF_DUMP_FILTER_MASK) >>
2733 MMF_DUMP_FILTER_SHIFT));
2735 ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
2738 put_task_struct(task);
2743 static ssize_t proc_coredump_filter_write(struct file *file,
2744 const char __user *buf,
2748 struct task_struct *task;
2749 struct mm_struct *mm;
2750 char buffer[PROC_NUMBUF], *end;
2757 memset(buffer, 0, sizeof(buffer));
2758 if (count > sizeof(buffer) - 1)
2759 count = sizeof(buffer) - 1;
2760 if (copy_from_user(buffer, buf, count))
2764 val = (unsigned int)simple_strtoul(buffer, &end, 0);
2767 if (end - buffer == 0)
2771 task = get_proc_task(file->f_dentry->d_inode);
2776 mm = get_task_mm(task);
2780 for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
2782 set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2784 clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2789 put_task_struct(task);
2794 static const struct file_operations proc_coredump_filter_operations = {
2795 .read = proc_coredump_filter_read,
2796 .write = proc_coredump_filter_write,
2797 .llseek = generic_file_llseek,
2804 static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
2807 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
2808 pid_t tgid = task_tgid_nr_ns(current, ns);
2809 char tmp[PROC_NUMBUF];
2812 sprintf(tmp, "%d", tgid);
2813 return vfs_readlink(dentry,buffer,buflen,tmp);
2816 static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
2818 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
2819 pid_t tgid = task_tgid_nr_ns(current, ns);
2820 char *name = ERR_PTR(-ENOENT);
2824 name = ERR_PTR(-ENOMEM);
2826 sprintf(name, "%d", tgid);
2828 nd_set_link(nd, name);
2832 static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd,
2835 char *s = nd_get_link(nd);
2840 static const struct inode_operations proc_self_inode_operations = {
2841 .readlink = proc_self_readlink,
2842 .follow_link = proc_self_follow_link,
2843 .put_link = proc_self_put_link,
2849 * These are the directory entries in the root directory of /proc
2850 * that properly belong to the /proc filesystem, as they describe
2851 * describe something that is process related.
2853 static const struct pid_entry proc_base_stuff[] = {
2854 NOD("self", S_IFLNK|S_IRWXUGO,
2855 &proc_self_inode_operations, NULL, {}),
2858 static struct dentry *proc_base_instantiate(struct inode *dir,
2859 struct dentry *dentry, struct task_struct *task, const void *ptr)
2861 const struct pid_entry *p = ptr;
2862 struct inode *inode;
2863 struct proc_inode *ei;
2864 struct dentry *error;
2866 /* Allocate the inode */
2867 error = ERR_PTR(-ENOMEM);
2868 inode = new_inode(dir->i_sb);
2872 /* Initialize the inode */
2874 inode->i_ino = get_next_ino();
2875 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
2878 * grab the reference to the task.
2880 ei->pid = get_task_pid(task, PIDTYPE_PID);
2884 inode->i_mode = p->mode;
2885 if (S_ISDIR(inode->i_mode))
2886 set_nlink(inode, 2);
2887 if (S_ISLNK(inode->i_mode))
2890 inode->i_op = p->iop;
2892 inode->i_fop = p->fop;
2894 d_add(dentry, inode);
2903 static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry)
2905 struct dentry *error;
2906 struct task_struct *task = get_proc_task(dir);
2907 const struct pid_entry *p, *last;
2909 error = ERR_PTR(-ENOENT);
2914 /* Lookup the directory entry */
2915 last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1];
2916 for (p = proc_base_stuff; p <= last; p++) {
2917 if (p->len != dentry->d_name.len)
2919 if (!memcmp(dentry->d_name.name, p->name, p->len))
2925 error = proc_base_instantiate(dir, dentry, task, p);
2928 put_task_struct(task);
2933 static int proc_base_fill_cache(struct file *filp, void *dirent,
2934 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
2936 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2937 proc_base_instantiate, task, p);
2940 #ifdef CONFIG_TASK_IO_ACCOUNTING
2941 static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
2943 struct task_io_accounting acct = task->ioac;
2944 unsigned long flags;
2947 result = mutex_lock_killable(&task->signal->cred_guard_mutex);
2951 if (!ptrace_may_access(task, PTRACE_MODE_READ)) {
2956 if (whole && lock_task_sighand(task, &flags)) {
2957 struct task_struct *t = task;
2959 task_io_accounting_add(&acct, &task->signal->ioac);
2960 while_each_thread(task, t)
2961 task_io_accounting_add(&acct, &t->ioac);
2963 unlock_task_sighand(task, &flags);
2965 result = sprintf(buffer,
2970 "read_bytes: %llu\n"
2971 "write_bytes: %llu\n"
2972 "cancelled_write_bytes: %llu\n",
2973 (unsigned long long)acct.rchar,
2974 (unsigned long long)acct.wchar,
2975 (unsigned long long)acct.syscr,
2976 (unsigned long long)acct.syscw,
2977 (unsigned long long)acct.read_bytes,
2978 (unsigned long long)acct.write_bytes,
2979 (unsigned long long)acct.cancelled_write_bytes);
2981 mutex_unlock(&task->signal->cred_guard_mutex);
2985 static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
2987 return do_io_accounting(task, buffer, 0);
2990 static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
2992 return do_io_accounting(task, buffer, 1);
2994 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2996 static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
2997 struct pid *pid, struct task_struct *task)
2999 int err = lock_trace(task);
3001 seq_printf(m, "%08x\n", task->personality);
3010 static const struct file_operations proc_task_operations;
3011 static const struct inode_operations proc_task_inode_operations;
3013 static const struct pid_entry tgid_base_stuff[] = {
3014 DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations),
3015 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
3016 #ifdef CONFIG_CHECKPOINT_RESTORE
3017 DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations),
3019 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
3020 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
3022 DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
3024 REG("environ", S_IRUSR, proc_environ_operations),
3025 INF("auxv", S_IRUSR, proc_pid_auxv),
3026 ONE("status", S_IRUGO, proc_pid_status),
3027 ONE("personality", S_IRUGO, proc_pid_personality),
3028 INF("limits", S_IRUGO, proc_pid_limits),
3029 #ifdef CONFIG_SCHED_DEBUG
3030 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
3032 #ifdef CONFIG_SCHED_AUTOGROUP
3033 REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),
3035 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
3036 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3037 INF("syscall", S_IRUGO, proc_pid_syscall),
3039 INF("cmdline", S_IRUGO, proc_pid_cmdline),
3040 ONE("stat", S_IRUGO, proc_tgid_stat),
3041 ONE("statm", S_IRUGO, proc_pid_statm),
3042 REG("maps", S_IRUGO, proc_maps_operations),
3044 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
3046 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3047 LNK("cwd", proc_cwd_link),
3048 LNK("root", proc_root_link),
3049 LNK("exe", proc_exe_link),
3050 REG("mounts", S_IRUGO, proc_mounts_operations),
3051 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
3052 REG("mountstats", S_IRUSR, proc_mountstats_operations),
3053 #ifdef CONFIG_PROC_PAGE_MONITOR
3054 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
3055 REG("smaps", S_IRUGO, proc_smaps_operations),
3056 REG("pagemap", S_IRUGO, proc_pagemap_operations),
3058 #ifdef CONFIG_SECURITY
3059 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
3061 #ifdef CONFIG_KALLSYMS
3062 INF("wchan", S_IRUGO, proc_pid_wchan),
3064 #ifdef CONFIG_STACKTRACE
3065 ONE("stack", S_IRUGO, proc_pid_stack),
3067 #ifdef CONFIG_SCHEDSTATS
3068 INF("schedstat", S_IRUGO, proc_pid_schedstat),
3070 #ifdef CONFIG_LATENCYTOP
3071 REG("latency", S_IRUGO, proc_lstats_operations),
3073 #ifdef CONFIG_PROC_PID_CPUSET
3074 REG("cpuset", S_IRUGO, proc_cpuset_operations),
3076 #ifdef CONFIG_CGROUPS
3077 REG("cgroup", S_IRUGO, proc_cgroup_operations),
3079 INF("oom_score", S_IRUGO, proc_oom_score),
3080 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
3081 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
3082 #ifdef CONFIG_AUDITSYSCALL
3083 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
3084 REG("sessionid", S_IRUGO, proc_sessionid_operations),
3086 #ifdef CONFIG_FAULT_INJECTION
3087 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
3089 #ifdef CONFIG_ELF_CORE
3090 REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
3092 #ifdef CONFIG_TASK_IO_ACCOUNTING
3093 INF("io", S_IRUSR, proc_tgid_io_accounting),
3095 #ifdef CONFIG_HARDWALL
3096 INF("hardwall", S_IRUGO, proc_pid_hardwall),
3100 static int proc_tgid_base_readdir(struct file * filp,
3101 void * dirent, filldir_t filldir)
3103 return proc_pident_readdir(filp,dirent,filldir,
3104 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
3107 static const struct file_operations proc_tgid_base_operations = {
3108 .read = generic_read_dir,
3109 .readdir = proc_tgid_base_readdir,
3110 .llseek = default_llseek,
3113 static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
3114 return proc_pident_lookup(dir, dentry,
3115 tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
3118 static const struct inode_operations proc_tgid_base_inode_operations = {
3119 .lookup = proc_tgid_base_lookup,
3120 .getattr = pid_getattr,
3121 .setattr = proc_setattr,
3124 static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
3126 struct dentry *dentry, *leader, *dir;
3127 char buf[PROC_NUMBUF];
3131 name.len = snprintf(buf, sizeof(buf), "%d", pid);
3132 dentry = d_hash_and_lookup(mnt->mnt_root, &name);
3134 shrink_dcache_parent(dentry);
3140 name.len = snprintf(buf, sizeof(buf), "%d", tgid);
3141 leader = d_hash_and_lookup(mnt->mnt_root, &name);
3146 name.len = strlen(name.name);
3147 dir = d_hash_and_lookup(leader, &name);
3149 goto out_put_leader;
3152 name.len = snprintf(buf, sizeof(buf), "%d", pid);
3153 dentry = d_hash_and_lookup(dir, &name);
3155 shrink_dcache_parent(dentry);
3168 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
3169 * @task: task that should be flushed.
3171 * When flushing dentries from proc, one needs to flush them from global
3172 * proc (proc_mnt) and from all the namespaces' procs this task was seen
3173 * in. This call is supposed to do all of this job.
3175 * Looks in the dcache for
3177 * /proc/@tgid/task/@pid
3178 * if either directory is present flushes it and all of it'ts children
3181 * It is safe and reasonable to cache /proc entries for a task until
3182 * that task exits. After that they just clog up the dcache with
3183 * useless entries, possibly causing useful dcache entries to be
3184 * flushed instead. This routine is proved to flush those useless
3185 * dcache entries at process exit time.
3187 * NOTE: This routine is just an optimization so it does not guarantee
3188 * that no dcache entries will exist at process exit time it
3189 * just makes it very unlikely that any will persist.
3192 void proc_flush_task(struct task_struct *task)
3195 struct pid *pid, *tgid;
3198 pid = task_pid(task);
3199 tgid = task_tgid(task);
3201 for (i = 0; i <= pid->level; i++) {
3202 upid = &pid->numbers[i];
3203 proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
3204 tgid->numbers[i].nr);
3207 upid = &pid->numbers[pid->level];
3209 pid_ns_release_proc(upid->ns);
3212 static struct dentry *proc_pid_instantiate(struct inode *dir,
3213 struct dentry * dentry,
3214 struct task_struct *task, const void *ptr)
3216 struct dentry *error = ERR_PTR(-ENOENT);
3217 struct inode *inode;
3219 inode = proc_pid_make_inode(dir->i_sb, task);
3223 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3224 inode->i_op = &proc_tgid_base_inode_operations;
3225 inode->i_fop = &proc_tgid_base_operations;
3226 inode->i_flags|=S_IMMUTABLE;
3228 set_nlink(inode, 2 + pid_entry_count_dirs(tgid_base_stuff,
3229 ARRAY_SIZE(tgid_base_stuff)));
3231 d_set_d_op(dentry, &pid_dentry_operations);
3233 d_add(dentry, inode);
3234 /* Close the race of the process dying before we return the dentry */
3235 if (pid_revalidate(dentry, NULL))
3241 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3243 struct dentry *result;
3244 struct task_struct *task;
3246 struct pid_namespace *ns;
3248 result = proc_base_lookup(dir, dentry);
3249 if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT)
3252 tgid = name_to_int(dentry);
3256 ns = dentry->d_sb->s_fs_info;
3258 task = find_task_by_pid_ns(tgid, ns);
3260 get_task_struct(task);
3265 result = proc_pid_instantiate(dir, dentry, task, NULL);
3266 put_task_struct(task);
3272 * Find the first task with tgid >= tgid
3277 struct task_struct *task;
3279 static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
3284 put_task_struct(iter.task);
3288 pid = find_ge_pid(iter.tgid, ns);
3290 iter.tgid = pid_nr_ns(pid, ns);
3291 iter.task = pid_task(pid, PIDTYPE_PID);
3292 /* What we to know is if the pid we have find is the
3293 * pid of a thread_group_leader. Testing for task
3294 * being a thread_group_leader is the obvious thing
3295 * todo but there is a window when it fails, due to
3296 * the pid transfer logic in de_thread.
3298 * So we perform the straight forward test of seeing
3299 * if the pid we have found is the pid of a thread
3300 * group leader, and don't worry if the task we have
3301 * found doesn't happen to be a thread group leader.
3302 * As we don't care in the case of readdir.
3304 if (!iter.task || !has_group_leader_pid(iter.task)) {
3308 get_task_struct(iter.task);
3314 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
3316 static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3317 struct tgid_iter iter)
3319 char name[PROC_NUMBUF];
3320 int len = snprintf(name, sizeof(name), "%d", iter.tgid);
3321 return proc_fill_cache(filp, dirent, filldir, name, len,
3322 proc_pid_instantiate, iter.task, NULL);
3325 /* for the /proc/ directory itself, after non-process stuff has been done */
3326 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
3329 struct task_struct *reaper;
3330 struct tgid_iter iter;
3331 struct pid_namespace *ns;
3333 if (filp->f_pos >= PID_MAX_LIMIT + TGID_OFFSET)
3335 nr = filp->f_pos - FIRST_PROCESS_ENTRY;
3337 reaper = get_proc_task(filp->f_path.dentry->d_inode);
3341 for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) {
3342 const struct pid_entry *p = &proc_base_stuff[nr];
3343 if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0)
3347 ns = filp->f_dentry->d_sb->s_fs_info;
3349 iter.tgid = filp->f_pos - TGID_OFFSET;
3350 for (iter = next_tgid(ns, iter);
3352 iter.tgid += 1, iter = next_tgid(ns, iter)) {
3353 filp->f_pos = iter.tgid + TGID_OFFSET;
3354 if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) {
3355 put_task_struct(iter.task);
3359 filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET;
3361 put_task_struct(reaper);
3369 static const struct pid_entry tid_base_stuff[] = {
3370 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
3371 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
3372 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
3373 REG("environ", S_IRUSR, proc_environ_operations),
3374 INF("auxv", S_IRUSR, proc_pid_auxv),
3375 ONE("status", S_IRUGO, proc_pid_status),
3376 ONE("personality", S_IRUGO, proc_pid_personality),
3377 INF("limits", S_IRUGO, proc_pid_limits),
3378 #ifdef CONFIG_SCHED_DEBUG
3379 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
3381 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
3382 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3383 INF("syscall", S_IRUGO, proc_pid_syscall),
3385 INF("cmdline", S_IRUGO, proc_pid_cmdline),
3386 ONE("stat", S_IRUGO, proc_tid_stat),
3387 ONE("statm", S_IRUGO, proc_pid_statm),
3388 REG("maps", S_IRUGO, proc_maps_operations),
3390 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
3392 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3393 LNK("cwd", proc_cwd_link),
3394 LNK("root", proc_root_link),
3395 LNK("exe", proc_exe_link),
3396 REG("mounts", S_IRUGO, proc_mounts_operations),
3397 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
3398 #ifdef CONFIG_PROC_PAGE_MONITOR
3399 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
3400 REG("smaps", S_IRUGO, proc_smaps_operations),
3401 REG("pagemap", S_IRUGO, proc_pagemap_operations),
3403 #ifdef CONFIG_SECURITY
3404 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
3406 #ifdef CONFIG_KALLSYMS
3407 INF("wchan", S_IRUGO, proc_pid_wchan),
3409 #ifdef CONFIG_STACKTRACE
3410 ONE("stack", S_IRUGO, proc_pid_stack),
3412 #ifdef CONFIG_SCHEDSTATS
3413 INF("schedstat", S_IRUGO, proc_pid_schedstat),
3415 #ifdef CONFIG_LATENCYTOP
3416 REG("latency", S_IRUGO, proc_lstats_operations),
3418 #ifdef CONFIG_PROC_PID_CPUSET
3419 REG("cpuset", S_IRUGO, proc_cpuset_operations),
3421 #ifdef CONFIG_CGROUPS
3422 REG("cgroup", S_IRUGO, proc_cgroup_operations),
3424 INF("oom_score", S_IRUGO, proc_oom_score),
3425 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
3426 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
3427 #ifdef CONFIG_AUDITSYSCALL
3428 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
3429 REG("sessionid", S_IRUGO, proc_sessionid_operations),
3431 #ifdef CONFIG_FAULT_INJECTION
3432 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
3434 #ifdef CONFIG_TASK_IO_ACCOUNTING
3435 INF("io", S_IRUSR, proc_tid_io_accounting),
3437 #ifdef CONFIG_HARDWALL
3438 INF("hardwall", S_IRUGO, proc_pid_hardwall),
3442 static int proc_tid_base_readdir(struct file * filp,
3443 void * dirent, filldir_t filldir)
3445 return proc_pident_readdir(filp,dirent,filldir,
3446 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
3449 static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
3450 return proc_pident_lookup(dir, dentry,
3451 tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
3454 static const struct file_operations proc_tid_base_operations = {
3455 .read = generic_read_dir,
3456 .readdir = proc_tid_base_readdir,
3457 .llseek = default_llseek,
3460 static const struct inode_operations proc_tid_base_inode_operations = {
3461 .lookup = proc_tid_base_lookup,
3462 .getattr = pid_getattr,
3463 .setattr = proc_setattr,
3466 static struct dentry *proc_task_instantiate(struct inode *dir,
3467 struct dentry *dentry, struct task_struct *task, const void *ptr)
3469 struct dentry *error = ERR_PTR(-ENOENT);
3470 struct inode *inode;
3471 inode = proc_pid_make_inode(dir->i_sb, task);
3475 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3476 inode->i_op = &proc_tid_base_inode_operations;
3477 inode->i_fop = &proc_tid_base_operations;
3478 inode->i_flags|=S_IMMUTABLE;
3480 set_nlink(inode, 2 + pid_entry_count_dirs(tid_base_stuff,
3481 ARRAY_SIZE(tid_base_stuff)));
3483 d_set_d_op(dentry, &pid_dentry_operations);
3485 d_add(dentry, inode);
3486 /* Close the race of the process dying before we return the dentry */
3487 if (pid_revalidate(dentry, NULL))
3493 static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3495 struct dentry *result = ERR_PTR(-ENOENT);
3496 struct task_struct *task;
3497 struct task_struct *leader = get_proc_task(dir);
3499 struct pid_namespace *ns;
3504 tid = name_to_int(dentry);
3508 ns = dentry->d_sb->s_fs_info;
3510 task = find_task_by_pid_ns(tid, ns);
3512 get_task_struct(task);
3516 if (!same_thread_group(leader, task))
3519 result = proc_task_instantiate(dir, dentry, task, NULL);
3521 put_task_struct(task);
3523 put_task_struct(leader);
3529 * Find the first tid of a thread group to return to user space.
3531 * Usually this is just the thread group leader, but if the users
3532 * buffer was too small or there was a seek into the middle of the
3533 * directory we have more work todo.
3535 * In the case of a short read we start with find_task_by_pid.
3537 * In the case of a seek we start with the leader and walk nr
3540 static struct task_struct *first_tid(struct task_struct *leader,
3541 int tid, int nr, struct pid_namespace *ns)
3543 struct task_struct *pos;
3546 /* Attempt to start with the pid of a thread */
3547 if (tid && (nr > 0)) {
3548 pos = find_task_by_pid_ns(tid, ns);
3549 if (pos && (pos->group_leader == leader))
3553 /* If nr exceeds the number of threads there is nothing todo */
3555 if (nr && nr >= get_nr_threads(leader))
3558 /* If we haven't found our starting place yet start
3559 * with the leader and walk nr threads forward.
3561 for (pos = leader; nr > 0; --nr) {
3562 pos = next_thread(pos);
3563 if (pos == leader) {
3569 get_task_struct(pos);
3576 * Find the next thread in the thread list.
3577 * Return NULL if there is an error or no next thread.
3579 * The reference to the input task_struct is released.
3581 static struct task_struct *next_tid(struct task_struct *start)
3583 struct task_struct *pos = NULL;
3585 if (pid_alive(start)) {
3586 pos = next_thread(start);
3587 if (thread_group_leader(pos))
3590 get_task_struct(pos);
3593 put_task_struct(start);
3597 static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3598 struct task_struct *task, int tid)
3600 char name[PROC_NUMBUF];
3601 int len = snprintf(name, sizeof(name), "%d", tid);
3602 return proc_fill_cache(filp, dirent, filldir, name, len,
3603 proc_task_instantiate, task, NULL);
3606 /* for the /proc/TGID/task/ directories */
3607 static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
3609 struct dentry *dentry = filp->f_path.dentry;
3610 struct inode *inode = dentry->d_inode;
3611 struct task_struct *leader = NULL;
3612 struct task_struct *task;
3613 int retval = -ENOENT;
3616 struct pid_namespace *ns;
3618 task = get_proc_task(inode);
3622 if (pid_alive(task)) {
3623 leader = task->group_leader;
3624 get_task_struct(leader);
3627 put_task_struct(task);
3632 switch ((unsigned long)filp->f_pos) {
3635 if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0)
3640 ino = parent_ino(dentry);
3641 if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0)
3647 /* f_version caches the tgid value that the last readdir call couldn't
3648 * return. lseek aka telldir automagically resets f_version to 0.
3650 ns = filp->f_dentry->d_sb->s_fs_info;
3651 tid = (int)filp->f_version;
3652 filp->f_version = 0;
3653 for (task = first_tid(leader, tid, filp->f_pos - 2, ns);
3655 task = next_tid(task), filp->f_pos++) {
3656 tid = task_pid_nr_ns(task, ns);
3657 if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) {
3658 /* returning this tgid failed, save it as the first
3659 * pid for the next readir call */
3660 filp->f_version = (u64)tid;
3661 put_task_struct(task);
3666 put_task_struct(leader);
3671 static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
3673 struct inode *inode = dentry->d_inode;
3674 struct task_struct *p = get_proc_task(inode);
3675 generic_fillattr(inode, stat);
3678 stat->nlink += get_nr_threads(p);
3685 static const struct inode_operations proc_task_inode_operations = {
3686 .lookup = proc_task_lookup,
3687 .getattr = proc_task_getattr,
3688 .setattr = proc_setattr,
3691 static const struct file_operations proc_task_operations = {
3692 .read = generic_read_dir,
3693 .readdir = proc_task_readdir,
3694 .llseek = default_llseek,