2 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 #include <linux/export.h>
20 #include <linux/moduleloader.h>
21 #include <linux/ftrace_event.h>
22 #include <linux/init.h>
23 #include <linux/kallsyms.h>
25 #include <linux/sysfs.h>
26 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/vmalloc.h>
29 #include <linux/elf.h>
30 #include <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #include <linux/syscalls.h>
33 #include <linux/fcntl.h>
34 #include <linux/rcupdate.h>
35 #include <linux/capability.h>
36 #include <linux/cpu.h>
37 #include <linux/moduleparam.h>
38 #include <linux/errno.h>
39 #include <linux/err.h>
40 #include <linux/vermagic.h>
41 #include <linux/notifier.h>
42 #include <linux/sched.h>
43 #include <linux/stop_machine.h>
44 #include <linux/device.h>
45 #include <linux/string.h>
46 #include <linux/mutex.h>
47 #include <linux/rculist.h>
48 #include <asm/uaccess.h>
49 #include <asm/cacheflush.h>
50 #include <asm/mmu_context.h>
51 #include <linux/license.h>
52 #include <asm/sections.h>
53 #include <linux/tracepoint.h>
54 #include <linux/ftrace.h>
55 #include <linux/async.h>
56 #include <linux/percpu.h>
57 #include <linux/kmemleak.h>
58 #include <linux/jump_label.h>
59 #include <linux/pfn.h>
60 #include <linux/bsearch.h>
61 #include "module-internal.h"
63 #define CREATE_TRACE_POINTS
64 #include <trace/events/module.h>
66 #ifndef ARCH_SHF_SMALL
67 #define ARCH_SHF_SMALL 0
71 * Modules' sections will be aligned on page boundaries
72 * to ensure complete separation of code and data, but
73 * only when CONFIG_DEBUG_SET_MODULE_RONX=y
75 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
76 # define debug_align(X) ALIGN(X, PAGE_SIZE)
78 # define debug_align(X) (X)
82 * Given BASE and SIZE this macro calculates the number of pages the
83 * memory regions occupies
85 #define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \
86 (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \
87 PFN_DOWN((unsigned long)BASE) + 1) \
90 /* If this is set, the section belongs in the init part of the module */
91 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
95 * 1) List of modules (also safely readable with preempt_disable),
96 * 2) module_use links,
97 * 3) module_addr_min/module_addr_max.
98 * (delete uses stop_machine/add uses RCU list operations). */
99 DEFINE_MUTEX(module_mutex);
100 EXPORT_SYMBOL_GPL(module_mutex);
101 static LIST_HEAD(modules);
102 #ifdef CONFIG_KGDB_KDB
103 struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
104 #endif /* CONFIG_KGDB_KDB */
106 #ifdef CONFIG_MODULE_SIG
107 #ifdef CONFIG_MODULE_SIG_FORCE
108 static bool sig_enforce = true;
110 static bool sig_enforce = false;
112 static int param_set_bool_enable_only(const char *val,
113 const struct kernel_param *kp)
117 struct kernel_param dummy_kp = *kp;
119 dummy_kp.arg = &test;
121 err = param_set_bool(val, &dummy_kp);
125 /* Don't let them unset it once it's set! */
126 if (!test && sig_enforce)
134 static const struct kernel_param_ops param_ops_bool_enable_only = {
135 .set = param_set_bool_enable_only,
136 .get = param_get_bool,
138 #define param_check_bool_enable_only param_check_bool
140 module_param(sig_enforce, bool_enable_only, 0644);
141 #endif /* !CONFIG_MODULE_SIG_FORCE */
142 #endif /* CONFIG_MODULE_SIG */
144 /* Block module loading/unloading? */
145 int modules_disabled = 0;
146 core_param(nomodule, modules_disabled, bint, 0);
148 /* Waiting for a module to finish initializing? */
149 static DECLARE_WAIT_QUEUE_HEAD(module_wq);
151 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
153 /* Bounds of module allocation, for speeding __module_address.
154 * Protected by module_mutex. */
155 static unsigned long module_addr_min = -1UL, module_addr_max = 0;
157 int register_module_notifier(struct notifier_block * nb)
159 return blocking_notifier_chain_register(&module_notify_list, nb);
161 EXPORT_SYMBOL(register_module_notifier);
163 int unregister_module_notifier(struct notifier_block * nb)
165 return blocking_notifier_chain_unregister(&module_notify_list, nb);
167 EXPORT_SYMBOL(unregister_module_notifier);
173 char *secstrings, *strtab;
174 unsigned long symoffs, stroffs;
175 struct _ddebug *debug;
176 unsigned int num_debug;
179 unsigned int sym, str, mod, vers, info, pcpu;
183 /* We require a truly strong try_module_get(): 0 means failure due to
184 ongoing or failed initialization etc. */
185 static inline int strong_try_module_get(struct module *mod)
187 if (mod && mod->state == MODULE_STATE_COMING)
189 if (try_module_get(mod))
195 static inline void add_taint_module(struct module *mod, unsigned flag)
198 mod->taints |= (1U << flag);
202 * A thread that wants to hold a reference to a module only while it
203 * is running can call this to safely exit. nfsd and lockd use this.
205 void __module_put_and_exit(struct module *mod, long code)
210 EXPORT_SYMBOL(__module_put_and_exit);
212 /* Find a module section: 0 means not found. */
213 static unsigned int find_sec(const struct load_info *info, const char *name)
217 for (i = 1; i < info->hdr->e_shnum; i++) {
218 Elf_Shdr *shdr = &info->sechdrs[i];
219 /* Alloc bit cleared means "ignore it." */
220 if ((shdr->sh_flags & SHF_ALLOC)
221 && strcmp(info->secstrings + shdr->sh_name, name) == 0)
227 /* Find a module section, or NULL. */
228 static void *section_addr(const struct load_info *info, const char *name)
230 /* Section 0 has sh_addr 0. */
231 return (void *)info->sechdrs[find_sec(info, name)].sh_addr;
234 /* Find a module section, or NULL. Fill in number of "objects" in section. */
235 static void *section_objs(const struct load_info *info,
240 unsigned int sec = find_sec(info, name);
242 /* Section 0 has sh_addr 0 and sh_size 0. */
243 *num = info->sechdrs[sec].sh_size / object_size;
244 return (void *)info->sechdrs[sec].sh_addr;
247 /* Provided by the linker */
248 extern const struct kernel_symbol __start___ksymtab[];
249 extern const struct kernel_symbol __stop___ksymtab[];
250 extern const struct kernel_symbol __start___ksymtab_gpl[];
251 extern const struct kernel_symbol __stop___ksymtab_gpl[];
252 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
253 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
254 extern const unsigned long __start___kcrctab[];
255 extern const unsigned long __start___kcrctab_gpl[];
256 extern const unsigned long __start___kcrctab_gpl_future[];
257 #ifdef CONFIG_UNUSED_SYMBOLS
258 extern const struct kernel_symbol __start___ksymtab_unused[];
259 extern const struct kernel_symbol __stop___ksymtab_unused[];
260 extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
261 extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
262 extern const unsigned long __start___kcrctab_unused[];
263 extern const unsigned long __start___kcrctab_unused_gpl[];
266 #ifndef CONFIG_MODVERSIONS
267 #define symversion(base, idx) NULL
269 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
272 static bool each_symbol_in_section(const struct symsearch *arr,
273 unsigned int arrsize,
274 struct module *owner,
275 bool (*fn)(const struct symsearch *syms,
276 struct module *owner,
282 for (j = 0; j < arrsize; j++) {
283 if (fn(&arr[j], owner, data))
290 /* Returns true as soon as fn returns true, otherwise false. */
291 bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
292 struct module *owner,
297 static const struct symsearch arr[] = {
298 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
299 NOT_GPL_ONLY, false },
300 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
301 __start___kcrctab_gpl,
303 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
304 __start___kcrctab_gpl_future,
305 WILL_BE_GPL_ONLY, false },
306 #ifdef CONFIG_UNUSED_SYMBOLS
307 { __start___ksymtab_unused, __stop___ksymtab_unused,
308 __start___kcrctab_unused,
309 NOT_GPL_ONLY, true },
310 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
311 __start___kcrctab_unused_gpl,
316 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
319 list_for_each_entry_rcu(mod, &modules, list) {
320 struct symsearch arr[] = {
321 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
322 NOT_GPL_ONLY, false },
323 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
326 { mod->gpl_future_syms,
327 mod->gpl_future_syms + mod->num_gpl_future_syms,
328 mod->gpl_future_crcs,
329 WILL_BE_GPL_ONLY, false },
330 #ifdef CONFIG_UNUSED_SYMBOLS
332 mod->unused_syms + mod->num_unused_syms,
334 NOT_GPL_ONLY, true },
335 { mod->unused_gpl_syms,
336 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
337 mod->unused_gpl_crcs,
342 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
347 EXPORT_SYMBOL_GPL(each_symbol_section);
349 struct find_symbol_arg {
356 struct module *owner;
357 const unsigned long *crc;
358 const struct kernel_symbol *sym;
361 static bool check_symbol(const struct symsearch *syms,
362 struct module *owner,
363 unsigned int symnum, void *data)
365 struct find_symbol_arg *fsa = data;
368 if (syms->licence == GPL_ONLY)
370 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
371 printk(KERN_WARNING "Symbol %s is being used "
372 "by a non-GPL module, which will not "
373 "be allowed in the future\n", fsa->name);
374 printk(KERN_WARNING "Please see the file "
375 "Documentation/feature-removal-schedule.txt "
376 "in the kernel source tree for more details.\n");
380 #ifdef CONFIG_UNUSED_SYMBOLS
381 if (syms->unused && fsa->warn) {
382 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
383 "however this module is using it.\n", fsa->name);
385 "This symbol will go away in the future.\n");
387 "Please evalute if this is the right api to use and if "
388 "it really is, submit a report the linux kernel "
389 "mailinglist together with submitting your code for "
395 fsa->crc = symversion(syms->crcs, symnum);
396 fsa->sym = &syms->start[symnum];
400 static int cmp_name(const void *va, const void *vb)
403 const struct kernel_symbol *b;
405 return strcmp(a, b->name);
408 static bool find_symbol_in_section(const struct symsearch *syms,
409 struct module *owner,
412 struct find_symbol_arg *fsa = data;
413 struct kernel_symbol *sym;
415 sym = bsearch(fsa->name, syms->start, syms->stop - syms->start,
416 sizeof(struct kernel_symbol), cmp_name);
418 if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data))
424 /* Find a symbol and return it, along with, (optional) crc and
425 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
426 const struct kernel_symbol *find_symbol(const char *name,
427 struct module **owner,
428 const unsigned long **crc,
432 struct find_symbol_arg fsa;
438 if (each_symbol_section(find_symbol_in_section, &fsa)) {
446 pr_debug("Failed to find symbol %s\n", name);
449 EXPORT_SYMBOL_GPL(find_symbol);
451 /* Search for module by name: must hold module_mutex. */
452 struct module *find_module(const char *name)
456 list_for_each_entry(mod, &modules, list) {
457 if (strcmp(mod->name, name) == 0)
462 EXPORT_SYMBOL_GPL(find_module);
466 static inline void __percpu *mod_percpu(struct module *mod)
471 static int percpu_modalloc(struct module *mod,
472 unsigned long size, unsigned long align)
474 if (align > PAGE_SIZE) {
475 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
476 mod->name, align, PAGE_SIZE);
480 mod->percpu = __alloc_reserved_percpu(size, align);
483 "%s: Could not allocate %lu bytes percpu data\n",
487 mod->percpu_size = size;
491 static void percpu_modfree(struct module *mod)
493 free_percpu(mod->percpu);
496 static unsigned int find_pcpusec(struct load_info *info)
498 return find_sec(info, ".data..percpu");
501 static void percpu_modcopy(struct module *mod,
502 const void *from, unsigned long size)
506 for_each_possible_cpu(cpu)
507 memcpy(per_cpu_ptr(mod->percpu, cpu), from, size);
511 * is_module_percpu_address - test whether address is from module static percpu
512 * @addr: address to test
514 * Test whether @addr belongs to module static percpu area.
517 * %true if @addr is from module static percpu area
519 bool is_module_percpu_address(unsigned long addr)
526 list_for_each_entry_rcu(mod, &modules, list) {
527 if (!mod->percpu_size)
529 for_each_possible_cpu(cpu) {
530 void *start = per_cpu_ptr(mod->percpu, cpu);
532 if ((void *)addr >= start &&
533 (void *)addr < start + mod->percpu_size) {
544 #else /* ... !CONFIG_SMP */
546 static inline void __percpu *mod_percpu(struct module *mod)
550 static inline int percpu_modalloc(struct module *mod,
551 unsigned long size, unsigned long align)
555 static inline void percpu_modfree(struct module *mod)
558 static unsigned int find_pcpusec(struct load_info *info)
562 static inline void percpu_modcopy(struct module *mod,
563 const void *from, unsigned long size)
565 /* pcpusec should be 0, and size of that section should be 0. */
568 bool is_module_percpu_address(unsigned long addr)
573 #endif /* CONFIG_SMP */
575 #define MODINFO_ATTR(field) \
576 static void setup_modinfo_##field(struct module *mod, const char *s) \
578 mod->field = kstrdup(s, GFP_KERNEL); \
580 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
581 struct module_kobject *mk, char *buffer) \
583 return sprintf(buffer, "%s\n", mk->mod->field); \
585 static int modinfo_##field##_exists(struct module *mod) \
587 return mod->field != NULL; \
589 static void free_modinfo_##field(struct module *mod) \
594 static struct module_attribute modinfo_##field = { \
595 .attr = { .name = __stringify(field), .mode = 0444 }, \
596 .show = show_modinfo_##field, \
597 .setup = setup_modinfo_##field, \
598 .test = modinfo_##field##_exists, \
599 .free = free_modinfo_##field, \
602 MODINFO_ATTR(version);
603 MODINFO_ATTR(srcversion);
605 static char last_unloaded_module[MODULE_NAME_LEN+1];
607 #ifdef CONFIG_MODULE_UNLOAD
609 EXPORT_TRACEPOINT_SYMBOL(module_get);
611 /* Init the unload section of the module. */
612 static int module_unload_init(struct module *mod)
614 mod->refptr = alloc_percpu(struct module_ref);
618 INIT_LIST_HEAD(&mod->source_list);
619 INIT_LIST_HEAD(&mod->target_list);
621 /* Hold reference count during initialization. */
622 __this_cpu_write(mod->refptr->incs, 1);
623 /* Backwards compatibility macros put refcount during init. */
624 mod->waiter = current;
629 /* Does a already use b? */
630 static int already_uses(struct module *a, struct module *b)
632 struct module_use *use;
634 list_for_each_entry(use, &b->source_list, source_list) {
635 if (use->source == a) {
636 pr_debug("%s uses %s!\n", a->name, b->name);
640 pr_debug("%s does not use %s!\n", a->name, b->name);
646 * - we add 'a' as a "source", 'b' as a "target" of module use
647 * - the module_use is added to the list of 'b' sources (so
648 * 'b' can walk the list to see who sourced them), and of 'a'
649 * targets (so 'a' can see what modules it targets).
651 static int add_module_usage(struct module *a, struct module *b)
653 struct module_use *use;
655 pr_debug("Allocating new usage for %s.\n", a->name);
656 use = kmalloc(sizeof(*use), GFP_ATOMIC);
658 printk(KERN_WARNING "%s: out of memory loading\n", a->name);
664 list_add(&use->source_list, &b->source_list);
665 list_add(&use->target_list, &a->target_list);
669 /* Module a uses b: caller needs module_mutex() */
670 int ref_module(struct module *a, struct module *b)
674 if (b == NULL || already_uses(a, b))
677 /* If module isn't available, we fail. */
678 err = strong_try_module_get(b);
682 err = add_module_usage(a, b);
689 EXPORT_SYMBOL_GPL(ref_module);
691 /* Clear the unload stuff of the module. */
692 static void module_unload_free(struct module *mod)
694 struct module_use *use, *tmp;
696 mutex_lock(&module_mutex);
697 list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) {
698 struct module *i = use->target;
699 pr_debug("%s unusing %s\n", mod->name, i->name);
701 list_del(&use->source_list);
702 list_del(&use->target_list);
705 mutex_unlock(&module_mutex);
707 free_percpu(mod->refptr);
710 #ifdef CONFIG_MODULE_FORCE_UNLOAD
711 static inline int try_force_unload(unsigned int flags)
713 int ret = (flags & O_TRUNC);
715 add_taint(TAINT_FORCED_RMMOD);
719 static inline int try_force_unload(unsigned int flags)
723 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
732 /* Whole machine is stopped with interrupts off when this runs. */
733 static int __try_stop_module(void *_sref)
735 struct stopref *sref = _sref;
737 /* If it's not unused, quit unless we're forcing. */
738 if (module_refcount(sref->mod) != 0) {
739 if (!(*sref->forced = try_force_unload(sref->flags)))
743 /* Mark it as dying. */
744 sref->mod->state = MODULE_STATE_GOING;
748 static int try_stop_module(struct module *mod, int flags, int *forced)
750 if (flags & O_NONBLOCK) {
751 struct stopref sref = { mod, flags, forced };
753 return stop_machine(__try_stop_module, &sref, NULL);
755 /* We don't need to stop the machine for this. */
756 mod->state = MODULE_STATE_GOING;
762 unsigned long module_refcount(struct module *mod)
764 unsigned long incs = 0, decs = 0;
767 for_each_possible_cpu(cpu)
768 decs += per_cpu_ptr(mod->refptr, cpu)->decs;
770 * ensure the incs are added up after the decs.
771 * module_put ensures incs are visible before decs with smp_wmb.
773 * This 2-count scheme avoids the situation where the refcount
774 * for CPU0 is read, then CPU0 increments the module refcount,
775 * then CPU1 drops that refcount, then the refcount for CPU1 is
776 * read. We would record a decrement but not its corresponding
777 * increment so we would see a low count (disaster).
779 * Rare situation? But module_refcount can be preempted, and we
780 * might be tallying up 4096+ CPUs. So it is not impossible.
783 for_each_possible_cpu(cpu)
784 incs += per_cpu_ptr(mod->refptr, cpu)->incs;
787 EXPORT_SYMBOL(module_refcount);
789 /* This exists whether we can unload or not */
790 static void free_module(struct module *mod);
792 static void wait_for_zero_refcount(struct module *mod)
794 /* Since we might sleep for some time, release the mutex first */
795 mutex_unlock(&module_mutex);
797 pr_debug("Looking at refcount...\n");
798 set_current_state(TASK_UNINTERRUPTIBLE);
799 if (module_refcount(mod) == 0)
803 current->state = TASK_RUNNING;
804 mutex_lock(&module_mutex);
807 SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
811 char name[MODULE_NAME_LEN];
814 if (!capable(CAP_SYS_MODULE) || modules_disabled)
817 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
819 name[MODULE_NAME_LEN-1] = '\0';
821 if (mutex_lock_interruptible(&module_mutex) != 0)
824 mod = find_module(name);
830 if (!list_empty(&mod->source_list)) {
831 /* Other modules depend on us: get rid of them first. */
836 /* Doing init or already dying? */
837 if (mod->state != MODULE_STATE_LIVE) {
838 /* FIXME: if (force), slam module count and wake up
840 pr_debug("%s already dying\n", mod->name);
845 /* If it has an init func, it must have an exit func to unload */
846 if (mod->init && !mod->exit) {
847 forced = try_force_unload(flags);
849 /* This module can't be removed */
855 /* Set this up before setting mod->state */
856 mod->waiter = current;
858 /* Stop the machine so refcounts can't move and disable module. */
859 ret = try_stop_module(mod, flags, &forced);
863 /* Never wait if forced. */
864 if (!forced && module_refcount(mod) != 0)
865 wait_for_zero_refcount(mod);
867 mutex_unlock(&module_mutex);
868 /* Final destruction now no one is using it. */
869 if (mod->exit != NULL)
871 blocking_notifier_call_chain(&module_notify_list,
872 MODULE_STATE_GOING, mod);
873 async_synchronize_full();
875 /* Store the name of the last unloaded module for diagnostic purposes */
876 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
881 mutex_unlock(&module_mutex);
885 static inline void print_unload_info(struct seq_file *m, struct module *mod)
887 struct module_use *use;
888 int printed_something = 0;
890 seq_printf(m, " %lu ", module_refcount(mod));
892 /* Always include a trailing , so userspace can differentiate
893 between this and the old multi-field proc format. */
894 list_for_each_entry(use, &mod->source_list, source_list) {
895 printed_something = 1;
896 seq_printf(m, "%s,", use->source->name);
899 if (mod->init != NULL && mod->exit == NULL) {
900 printed_something = 1;
901 seq_printf(m, "[permanent],");
904 if (!printed_something)
908 void __symbol_put(const char *symbol)
910 struct module *owner;
913 if (!find_symbol(symbol, &owner, NULL, true, false))
918 EXPORT_SYMBOL(__symbol_put);
920 /* Note this assumes addr is a function, which it currently always is. */
921 void symbol_put_addr(void *addr)
923 struct module *modaddr;
924 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
926 if (core_kernel_text(a))
929 /* module_text_address is safe here: we're supposed to have reference
930 * to module from symbol_get, so it can't go away. */
931 modaddr = __module_text_address(a);
935 EXPORT_SYMBOL_GPL(symbol_put_addr);
937 static ssize_t show_refcnt(struct module_attribute *mattr,
938 struct module_kobject *mk, char *buffer)
940 return sprintf(buffer, "%lu\n", module_refcount(mk->mod));
943 static struct module_attribute modinfo_refcnt =
944 __ATTR(refcnt, 0444, show_refcnt, NULL);
946 void __module_get(struct module *module)
950 __this_cpu_inc(module->refptr->incs);
951 trace_module_get(module, _RET_IP_);
955 EXPORT_SYMBOL(__module_get);
957 bool try_module_get(struct module *module)
964 if (likely(module_is_live(module))) {
965 __this_cpu_inc(module->refptr->incs);
966 trace_module_get(module, _RET_IP_);
974 EXPORT_SYMBOL(try_module_get);
976 void module_put(struct module *module)
980 smp_wmb(); /* see comment in module_refcount */
981 __this_cpu_inc(module->refptr->decs);
983 trace_module_put(module, _RET_IP_);
984 /* Maybe they're waiting for us to drop reference? */
985 if (unlikely(!module_is_live(module)))
986 wake_up_process(module->waiter);
990 EXPORT_SYMBOL(module_put);
992 #else /* !CONFIG_MODULE_UNLOAD */
993 static inline void print_unload_info(struct seq_file *m, struct module *mod)
995 /* We don't know the usage count, or what modules are using. */
996 seq_printf(m, " - -");
999 static inline void module_unload_free(struct module *mod)
1003 int ref_module(struct module *a, struct module *b)
1005 return strong_try_module_get(b);
1007 EXPORT_SYMBOL_GPL(ref_module);
1009 static inline int module_unload_init(struct module *mod)
1013 #endif /* CONFIG_MODULE_UNLOAD */
1015 static size_t module_flags_taint(struct module *mod, char *buf)
1019 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
1021 if (mod->taints & (1 << TAINT_OOT_MODULE))
1023 if (mod->taints & (1 << TAINT_FORCED_MODULE))
1025 if (mod->taints & (1 << TAINT_CRAP))
1028 * TAINT_FORCED_RMMOD: could be added.
1029 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
1035 static ssize_t show_initstate(struct module_attribute *mattr,
1036 struct module_kobject *mk, char *buffer)
1038 const char *state = "unknown";
1040 switch (mk->mod->state) {
1041 case MODULE_STATE_LIVE:
1044 case MODULE_STATE_COMING:
1047 case MODULE_STATE_GOING:
1051 return sprintf(buffer, "%s\n", state);
1054 static struct module_attribute modinfo_initstate =
1055 __ATTR(initstate, 0444, show_initstate, NULL);
1057 static ssize_t store_uevent(struct module_attribute *mattr,
1058 struct module_kobject *mk,
1059 const char *buffer, size_t count)
1061 enum kobject_action action;
1063 if (kobject_action_type(buffer, count, &action) == 0)
1064 kobject_uevent(&mk->kobj, action);
1068 struct module_attribute module_uevent =
1069 __ATTR(uevent, 0200, NULL, store_uevent);
1071 static ssize_t show_coresize(struct module_attribute *mattr,
1072 struct module_kobject *mk, char *buffer)
1074 return sprintf(buffer, "%u\n", mk->mod->core_size);
1077 static struct module_attribute modinfo_coresize =
1078 __ATTR(coresize, 0444, show_coresize, NULL);
1080 static ssize_t show_initsize(struct module_attribute *mattr,
1081 struct module_kobject *mk, char *buffer)
1083 return sprintf(buffer, "%u\n", mk->mod->init_size);
1086 static struct module_attribute modinfo_initsize =
1087 __ATTR(initsize, 0444, show_initsize, NULL);
1089 static ssize_t show_taint(struct module_attribute *mattr,
1090 struct module_kobject *mk, char *buffer)
1094 l = module_flags_taint(mk->mod, buffer);
1099 static struct module_attribute modinfo_taint =
1100 __ATTR(taint, 0444, show_taint, NULL);
1102 static struct module_attribute *modinfo_attrs[] = {
1105 &modinfo_srcversion,
1110 #ifdef CONFIG_MODULE_UNLOAD
1116 static const char vermagic[] = VERMAGIC_STRING;
1118 static int try_to_force_load(struct module *mod, const char *reason)
1120 #ifdef CONFIG_MODULE_FORCE_LOAD
1121 if (!test_taint(TAINT_FORCED_MODULE))
1122 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
1124 add_taint_module(mod, TAINT_FORCED_MODULE);
1131 #ifdef CONFIG_MODVERSIONS
1132 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1133 static unsigned long maybe_relocated(unsigned long crc,
1134 const struct module *crc_owner)
1136 #ifdef ARCH_RELOCATES_KCRCTAB
1137 if (crc_owner == NULL)
1138 return crc - (unsigned long)reloc_start;
1143 static int check_version(Elf_Shdr *sechdrs,
1144 unsigned int versindex,
1145 const char *symname,
1147 const unsigned long *crc,
1148 const struct module *crc_owner)
1150 unsigned int i, num_versions;
1151 struct modversion_info *versions;
1153 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1157 /* No versions at all? modprobe --force does this. */
1159 return try_to_force_load(mod, symname) == 0;
1161 versions = (void *) sechdrs[versindex].sh_addr;
1162 num_versions = sechdrs[versindex].sh_size
1163 / sizeof(struct modversion_info);
1165 for (i = 0; i < num_versions; i++) {
1166 if (strcmp(versions[i].name, symname) != 0)
1169 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
1171 pr_debug("Found checksum %lX vs module %lX\n",
1172 maybe_relocated(*crc, crc_owner), versions[i].crc);
1176 printk(KERN_WARNING "%s: no symbol version for %s\n",
1177 mod->name, symname);
1181 printk("%s: disagrees about version of symbol %s\n",
1182 mod->name, symname);
1186 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1187 unsigned int versindex,
1190 const unsigned long *crc;
1192 /* Since this should be found in kernel (which can't be removed),
1193 * no locking is necessary. */
1194 if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
1197 return check_version(sechdrs, versindex, "module_layout", mod, crc,
1201 /* First part is kernel version, which we ignore if module has crcs. */
1202 static inline int same_magic(const char *amagic, const char *bmagic,
1206 amagic += strcspn(amagic, " ");
1207 bmagic += strcspn(bmagic, " ");
1209 return strcmp(amagic, bmagic) == 0;
1212 static inline int check_version(Elf_Shdr *sechdrs,
1213 unsigned int versindex,
1214 const char *symname,
1216 const unsigned long *crc,
1217 const struct module *crc_owner)
1222 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1223 unsigned int versindex,
1229 static inline int same_magic(const char *amagic, const char *bmagic,
1232 return strcmp(amagic, bmagic) == 0;
1234 #endif /* CONFIG_MODVERSIONS */
1236 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1237 static const struct kernel_symbol *resolve_symbol(struct module *mod,
1238 const struct load_info *info,
1242 struct module *owner;
1243 const struct kernel_symbol *sym;
1244 const unsigned long *crc;
1247 mutex_lock(&module_mutex);
1248 sym = find_symbol(name, &owner, &crc,
1249 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
1253 if (!check_version(info->sechdrs, info->index.vers, name, mod, crc,
1255 sym = ERR_PTR(-EINVAL);
1259 err = ref_module(mod, owner);
1266 /* We must make copy under the lock if we failed to get ref. */
1267 strncpy(ownername, module_name(owner), MODULE_NAME_LEN);
1269 mutex_unlock(&module_mutex);
1273 static const struct kernel_symbol *
1274 resolve_symbol_wait(struct module *mod,
1275 const struct load_info *info,
1278 const struct kernel_symbol *ksym;
1279 char owner[MODULE_NAME_LEN];
1281 if (wait_event_interruptible_timeout(module_wq,
1282 !IS_ERR(ksym = resolve_symbol(mod, info, name, owner))
1283 || PTR_ERR(ksym) != -EBUSY,
1285 printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n",
1292 * /sys/module/foo/sections stuff
1293 * J. Corbet <corbet@lwn.net>
1297 #ifdef CONFIG_KALLSYMS
1298 static inline bool sect_empty(const Elf_Shdr *sect)
1300 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1303 struct module_sect_attr
1305 struct module_attribute mattr;
1307 unsigned long address;
1310 struct module_sect_attrs
1312 struct attribute_group grp;
1313 unsigned int nsections;
1314 struct module_sect_attr attrs[0];
1317 static ssize_t module_sect_show(struct module_attribute *mattr,
1318 struct module_kobject *mk, char *buf)
1320 struct module_sect_attr *sattr =
1321 container_of(mattr, struct module_sect_attr, mattr);
1322 return sprintf(buf, "0x%pK\n", (void *)sattr->address);
1325 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1327 unsigned int section;
1329 for (section = 0; section < sect_attrs->nsections; section++)
1330 kfree(sect_attrs->attrs[section].name);
1334 static void add_sect_attrs(struct module *mod, const struct load_info *info)
1336 unsigned int nloaded = 0, i, size[2];
1337 struct module_sect_attrs *sect_attrs;
1338 struct module_sect_attr *sattr;
1339 struct attribute **gattr;
1341 /* Count loaded sections and allocate structures */
1342 for (i = 0; i < info->hdr->e_shnum; i++)
1343 if (!sect_empty(&info->sechdrs[i]))
1345 size[0] = ALIGN(sizeof(*sect_attrs)
1346 + nloaded * sizeof(sect_attrs->attrs[0]),
1347 sizeof(sect_attrs->grp.attrs[0]));
1348 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1349 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1350 if (sect_attrs == NULL)
1353 /* Setup section attributes. */
1354 sect_attrs->grp.name = "sections";
1355 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1357 sect_attrs->nsections = 0;
1358 sattr = §_attrs->attrs[0];
1359 gattr = §_attrs->grp.attrs[0];
1360 for (i = 0; i < info->hdr->e_shnum; i++) {
1361 Elf_Shdr *sec = &info->sechdrs[i];
1362 if (sect_empty(sec))
1364 sattr->address = sec->sh_addr;
1365 sattr->name = kstrdup(info->secstrings + sec->sh_name,
1367 if (sattr->name == NULL)
1369 sect_attrs->nsections++;
1370 sysfs_attr_init(&sattr->mattr.attr);
1371 sattr->mattr.show = module_sect_show;
1372 sattr->mattr.store = NULL;
1373 sattr->mattr.attr.name = sattr->name;
1374 sattr->mattr.attr.mode = S_IRUGO;
1375 *(gattr++) = &(sattr++)->mattr.attr;
1379 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1382 mod->sect_attrs = sect_attrs;
1385 free_sect_attrs(sect_attrs);
1388 static void remove_sect_attrs(struct module *mod)
1390 if (mod->sect_attrs) {
1391 sysfs_remove_group(&mod->mkobj.kobj,
1392 &mod->sect_attrs->grp);
1393 /* We are positive that no one is using any sect attrs
1394 * at this point. Deallocate immediately. */
1395 free_sect_attrs(mod->sect_attrs);
1396 mod->sect_attrs = NULL;
1401 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1404 struct module_notes_attrs {
1405 struct kobject *dir;
1407 struct bin_attribute attrs[0];
1410 static ssize_t module_notes_read(struct file *filp, struct kobject *kobj,
1411 struct bin_attribute *bin_attr,
1412 char *buf, loff_t pos, size_t count)
1415 * The caller checked the pos and count against our size.
1417 memcpy(buf, bin_attr->private + pos, count);
1421 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1424 if (notes_attrs->dir) {
1426 sysfs_remove_bin_file(notes_attrs->dir,
1427 ¬es_attrs->attrs[i]);
1428 kobject_put(notes_attrs->dir);
1433 static void add_notes_attrs(struct module *mod, const struct load_info *info)
1435 unsigned int notes, loaded, i;
1436 struct module_notes_attrs *notes_attrs;
1437 struct bin_attribute *nattr;
1439 /* failed to create section attributes, so can't create notes */
1440 if (!mod->sect_attrs)
1443 /* Count notes sections and allocate structures. */
1445 for (i = 0; i < info->hdr->e_shnum; i++)
1446 if (!sect_empty(&info->sechdrs[i]) &&
1447 (info->sechdrs[i].sh_type == SHT_NOTE))
1453 notes_attrs = kzalloc(sizeof(*notes_attrs)
1454 + notes * sizeof(notes_attrs->attrs[0]),
1456 if (notes_attrs == NULL)
1459 notes_attrs->notes = notes;
1460 nattr = ¬es_attrs->attrs[0];
1461 for (loaded = i = 0; i < info->hdr->e_shnum; ++i) {
1462 if (sect_empty(&info->sechdrs[i]))
1464 if (info->sechdrs[i].sh_type == SHT_NOTE) {
1465 sysfs_bin_attr_init(nattr);
1466 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1467 nattr->attr.mode = S_IRUGO;
1468 nattr->size = info->sechdrs[i].sh_size;
1469 nattr->private = (void *) info->sechdrs[i].sh_addr;
1470 nattr->read = module_notes_read;
1476 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1477 if (!notes_attrs->dir)
1480 for (i = 0; i < notes; ++i)
1481 if (sysfs_create_bin_file(notes_attrs->dir,
1482 ¬es_attrs->attrs[i]))
1485 mod->notes_attrs = notes_attrs;
1489 free_notes_attrs(notes_attrs, i);
1492 static void remove_notes_attrs(struct module *mod)
1494 if (mod->notes_attrs)
1495 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1500 static inline void add_sect_attrs(struct module *mod,
1501 const struct load_info *info)
1505 static inline void remove_sect_attrs(struct module *mod)
1509 static inline void add_notes_attrs(struct module *mod,
1510 const struct load_info *info)
1514 static inline void remove_notes_attrs(struct module *mod)
1517 #endif /* CONFIG_KALLSYMS */
1519 static void add_usage_links(struct module *mod)
1521 #ifdef CONFIG_MODULE_UNLOAD
1522 struct module_use *use;
1525 mutex_lock(&module_mutex);
1526 list_for_each_entry(use, &mod->target_list, target_list) {
1527 nowarn = sysfs_create_link(use->target->holders_dir,
1528 &mod->mkobj.kobj, mod->name);
1530 mutex_unlock(&module_mutex);
1534 static void del_usage_links(struct module *mod)
1536 #ifdef CONFIG_MODULE_UNLOAD
1537 struct module_use *use;
1539 mutex_lock(&module_mutex);
1540 list_for_each_entry(use, &mod->target_list, target_list)
1541 sysfs_remove_link(use->target->holders_dir, mod->name);
1542 mutex_unlock(&module_mutex);
1546 static int module_add_modinfo_attrs(struct module *mod)
1548 struct module_attribute *attr;
1549 struct module_attribute *temp_attr;
1553 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1554 (ARRAY_SIZE(modinfo_attrs) + 1)),
1556 if (!mod->modinfo_attrs)
1559 temp_attr = mod->modinfo_attrs;
1560 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1562 (attr->test && attr->test(mod))) {
1563 memcpy(temp_attr, attr, sizeof(*temp_attr));
1564 sysfs_attr_init(&temp_attr->attr);
1565 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1572 static void module_remove_modinfo_attrs(struct module *mod)
1574 struct module_attribute *attr;
1577 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1578 /* pick a field to test for end of list */
1579 if (!attr->attr.name)
1581 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1585 kfree(mod->modinfo_attrs);
1588 static int mod_sysfs_init(struct module *mod)
1591 struct kobject *kobj;
1593 if (!module_sysfs_initialized) {
1594 printk(KERN_ERR "%s: module sysfs not initialized\n",
1600 kobj = kset_find_obj(module_kset, mod->name);
1602 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1608 mod->mkobj.mod = mod;
1610 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1611 mod->mkobj.kobj.kset = module_kset;
1612 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1615 kobject_put(&mod->mkobj.kobj);
1617 /* delay uevent until full sysfs population */
1622 static int mod_sysfs_setup(struct module *mod,
1623 const struct load_info *info,
1624 struct kernel_param *kparam,
1625 unsigned int num_params)
1629 err = mod_sysfs_init(mod);
1633 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1634 if (!mod->holders_dir) {
1639 err = module_param_sysfs_setup(mod, kparam, num_params);
1641 goto out_unreg_holders;
1643 err = module_add_modinfo_attrs(mod);
1645 goto out_unreg_param;
1647 add_usage_links(mod);
1648 add_sect_attrs(mod, info);
1649 add_notes_attrs(mod, info);
1651 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1655 module_param_sysfs_remove(mod);
1657 kobject_put(mod->holders_dir);
1659 kobject_put(&mod->mkobj.kobj);
1664 static void mod_sysfs_fini(struct module *mod)
1666 remove_notes_attrs(mod);
1667 remove_sect_attrs(mod);
1668 kobject_put(&mod->mkobj.kobj);
1671 #else /* !CONFIG_SYSFS */
1673 static int mod_sysfs_setup(struct module *mod,
1674 const struct load_info *info,
1675 struct kernel_param *kparam,
1676 unsigned int num_params)
1681 static void mod_sysfs_fini(struct module *mod)
1685 static void module_remove_modinfo_attrs(struct module *mod)
1689 static void del_usage_links(struct module *mod)
1693 #endif /* CONFIG_SYSFS */
1695 static void mod_sysfs_teardown(struct module *mod)
1697 del_usage_links(mod);
1698 module_remove_modinfo_attrs(mod);
1699 module_param_sysfs_remove(mod);
1700 kobject_put(mod->mkobj.drivers_dir);
1701 kobject_put(mod->holders_dir);
1702 mod_sysfs_fini(mod);
1706 * unlink the module with the whole machine is stopped with interrupts off
1707 * - this defends against kallsyms not taking locks
1709 static int __unlink_module(void *_mod)
1711 struct module *mod = _mod;
1712 list_del(&mod->list);
1713 module_bug_cleanup(mod);
1717 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
1719 * LKM RO/NX protection: protect module's text/ro-data
1720 * from modification and any data from execution.
1722 void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages))
1724 unsigned long begin_pfn = PFN_DOWN((unsigned long)start);
1725 unsigned long end_pfn = PFN_DOWN((unsigned long)end);
1727 if (end_pfn > begin_pfn)
1728 set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn);
1731 static void set_section_ro_nx(void *base,
1732 unsigned long text_size,
1733 unsigned long ro_size,
1734 unsigned long total_size)
1736 /* begin and end PFNs of the current subsection */
1737 unsigned long begin_pfn;
1738 unsigned long end_pfn;
1741 * Set RO for module text and RO-data:
1742 * - Always protect first page.
1743 * - Do not protect last partial page.
1746 set_page_attributes(base, base + ro_size, set_memory_ro);
1749 * Set NX permissions for module data:
1750 * - Do not protect first partial page.
1751 * - Always protect last page.
1753 if (total_size > text_size) {
1754 begin_pfn = PFN_UP((unsigned long)base + text_size);
1755 end_pfn = PFN_UP((unsigned long)base + total_size);
1756 if (end_pfn > begin_pfn)
1757 set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn);
1761 static void unset_module_core_ro_nx(struct module *mod)
1763 set_page_attributes(mod->module_core + mod->core_text_size,
1764 mod->module_core + mod->core_size,
1766 set_page_attributes(mod->module_core,
1767 mod->module_core + mod->core_ro_size,
1771 static void unset_module_init_ro_nx(struct module *mod)
1773 set_page_attributes(mod->module_init + mod->init_text_size,
1774 mod->module_init + mod->init_size,
1776 set_page_attributes(mod->module_init,
1777 mod->module_init + mod->init_ro_size,
1781 /* Iterate through all modules and set each module's text as RW */
1782 void set_all_modules_text_rw(void)
1786 mutex_lock(&module_mutex);
1787 list_for_each_entry_rcu(mod, &modules, list) {
1788 if ((mod->module_core) && (mod->core_text_size)) {
1789 set_page_attributes(mod->module_core,
1790 mod->module_core + mod->core_text_size,
1793 if ((mod->module_init) && (mod->init_text_size)) {
1794 set_page_attributes(mod->module_init,
1795 mod->module_init + mod->init_text_size,
1799 mutex_unlock(&module_mutex);
1802 /* Iterate through all modules and set each module's text as RO */
1803 void set_all_modules_text_ro(void)
1807 mutex_lock(&module_mutex);
1808 list_for_each_entry_rcu(mod, &modules, list) {
1809 if ((mod->module_core) && (mod->core_text_size)) {
1810 set_page_attributes(mod->module_core,
1811 mod->module_core + mod->core_text_size,
1814 if ((mod->module_init) && (mod->init_text_size)) {
1815 set_page_attributes(mod->module_init,
1816 mod->module_init + mod->init_text_size,
1820 mutex_unlock(&module_mutex);
1823 static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { }
1824 static void unset_module_core_ro_nx(struct module *mod) { }
1825 static void unset_module_init_ro_nx(struct module *mod) { }
1828 void __weak module_free(struct module *mod, void *module_region)
1830 vfree(module_region);
1833 void __weak module_arch_cleanup(struct module *mod)
1837 /* Free a module, remove from lists, etc. */
1838 static void free_module(struct module *mod)
1840 trace_module_free(mod);
1842 /* Delete from various lists */
1843 mutex_lock(&module_mutex);
1844 stop_machine(__unlink_module, mod, NULL);
1845 mutex_unlock(&module_mutex);
1846 mod_sysfs_teardown(mod);
1848 /* Remove dynamic debug info */
1849 ddebug_remove_module(mod->name);
1851 /* Arch-specific cleanup. */
1852 module_arch_cleanup(mod);
1854 /* Module unload stuff */
1855 module_unload_free(mod);
1857 /* Free any allocated parameters. */
1858 destroy_params(mod->kp, mod->num_kp);
1860 /* This may be NULL, but that's OK */
1861 unset_module_init_ro_nx(mod);
1862 module_free(mod, mod->module_init);
1864 percpu_modfree(mod);
1866 /* Free lock-classes: */
1867 lockdep_free_key_range(mod->module_core, mod->core_size);
1869 /* Finally, free the core (containing the module structure) */
1870 unset_module_core_ro_nx(mod);
1871 module_free(mod, mod->module_core);
1874 update_protections(current->mm);
1878 void *__symbol_get(const char *symbol)
1880 struct module *owner;
1881 const struct kernel_symbol *sym;
1884 sym = find_symbol(symbol, &owner, NULL, true, true);
1885 if (sym && strong_try_module_get(owner))
1889 return sym ? (void *)sym->value : NULL;
1891 EXPORT_SYMBOL_GPL(__symbol_get);
1894 * Ensure that an exported symbol [global namespace] does not already exist
1895 * in the kernel or in some other module's exported symbol table.
1897 * You must hold the module_mutex.
1899 static int verify_export_symbols(struct module *mod)
1902 struct module *owner;
1903 const struct kernel_symbol *s;
1905 const struct kernel_symbol *sym;
1908 { mod->syms, mod->num_syms },
1909 { mod->gpl_syms, mod->num_gpl_syms },
1910 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1911 #ifdef CONFIG_UNUSED_SYMBOLS
1912 { mod->unused_syms, mod->num_unused_syms },
1913 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1917 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1918 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1919 if (find_symbol(s->name, &owner, NULL, true, false)) {
1921 "%s: exports duplicate symbol %s"
1923 mod->name, s->name, module_name(owner));
1931 /* Change all symbols so that st_value encodes the pointer directly. */
1932 static int simplify_symbols(struct module *mod, const struct load_info *info)
1934 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
1935 Elf_Sym *sym = (void *)symsec->sh_addr;
1936 unsigned long secbase;
1939 const struct kernel_symbol *ksym;
1941 for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) {
1942 const char *name = info->strtab + sym[i].st_name;
1944 switch (sym[i].st_shndx) {
1946 /* We compiled with -fno-common. These are not
1947 supposed to happen. */
1948 pr_debug("Common symbol: %s\n", name);
1949 printk("%s: please compile with -fno-common\n",
1955 /* Don't need to do anything */
1956 pr_debug("Absolute symbol: 0x%08lx\n",
1957 (long)sym[i].st_value);
1961 ksym = resolve_symbol_wait(mod, info, name);
1962 /* Ok if resolved. */
1963 if (ksym && !IS_ERR(ksym)) {
1964 sym[i].st_value = ksym->value;
1969 if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1972 printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n",
1973 mod->name, name, PTR_ERR(ksym));
1974 ret = PTR_ERR(ksym) ?: -ENOENT;
1978 /* Divert to percpu allocation if a percpu var. */
1979 if (sym[i].st_shndx == info->index.pcpu)
1980 secbase = (unsigned long)mod_percpu(mod);
1982 secbase = info->sechdrs[sym[i].st_shndx].sh_addr;
1983 sym[i].st_value += secbase;
1991 static int apply_relocations(struct module *mod, const struct load_info *info)
1996 /* Now do relocations. */
1997 for (i = 1; i < info->hdr->e_shnum; i++) {
1998 unsigned int infosec = info->sechdrs[i].sh_info;
2000 /* Not a valid relocation section? */
2001 if (infosec >= info->hdr->e_shnum)
2004 /* Don't bother with non-allocated sections */
2005 if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC))
2008 if (info->sechdrs[i].sh_type == SHT_REL)
2009 err = apply_relocate(info->sechdrs, info->strtab,
2010 info->index.sym, i, mod);
2011 else if (info->sechdrs[i].sh_type == SHT_RELA)
2012 err = apply_relocate_add(info->sechdrs, info->strtab,
2013 info->index.sym, i, mod);
2020 /* Additional bytes needed by arch in front of individual sections */
2021 unsigned int __weak arch_mod_section_prepend(struct module *mod,
2022 unsigned int section)
2024 /* default implementation just returns zero */
2028 /* Update size with this section: return offset. */
2029 static long get_offset(struct module *mod, unsigned int *size,
2030 Elf_Shdr *sechdr, unsigned int section)
2034 *size += arch_mod_section_prepend(mod, section);
2035 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
2036 *size = ret + sechdr->sh_size;
2040 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
2041 might -- code, read-only data, read-write data, small data. Tally
2042 sizes, and place the offsets into sh_entsize fields: high bit means it
2044 static void layout_sections(struct module *mod, struct load_info *info)
2046 static unsigned long const masks[][2] = {
2047 /* NOTE: all executable code must be the first section
2048 * in this array; otherwise modify the text_size
2049 * finder in the two loops below */
2050 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
2051 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
2052 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
2053 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
2057 for (i = 0; i < info->hdr->e_shnum; i++)
2058 info->sechdrs[i].sh_entsize = ~0UL;
2060 pr_debug("Core section allocation order:\n");
2061 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
2062 for (i = 0; i < info->hdr->e_shnum; ++i) {
2063 Elf_Shdr *s = &info->sechdrs[i];
2064 const char *sname = info->secstrings + s->sh_name;
2066 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2067 || (s->sh_flags & masks[m][1])
2068 || s->sh_entsize != ~0UL
2069 || strstarts(sname, ".init"))
2071 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
2072 pr_debug("\t%s\n", sname);
2075 case 0: /* executable */
2076 mod->core_size = debug_align(mod->core_size);
2077 mod->core_text_size = mod->core_size;
2079 case 1: /* RO: text and ro-data */
2080 mod->core_size = debug_align(mod->core_size);
2081 mod->core_ro_size = mod->core_size;
2083 case 3: /* whole core */
2084 mod->core_size = debug_align(mod->core_size);
2089 pr_debug("Init section allocation order:\n");
2090 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
2091 for (i = 0; i < info->hdr->e_shnum; ++i) {
2092 Elf_Shdr *s = &info->sechdrs[i];
2093 const char *sname = info->secstrings + s->sh_name;
2095 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2096 || (s->sh_flags & masks[m][1])
2097 || s->sh_entsize != ~0UL
2098 || !strstarts(sname, ".init"))
2100 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
2101 | INIT_OFFSET_MASK);
2102 pr_debug("\t%s\n", sname);
2105 case 0: /* executable */
2106 mod->init_size = debug_align(mod->init_size);
2107 mod->init_text_size = mod->init_size;
2109 case 1: /* RO: text and ro-data */
2110 mod->init_size = debug_align(mod->init_size);
2111 mod->init_ro_size = mod->init_size;
2113 case 3: /* whole init */
2114 mod->init_size = debug_align(mod->init_size);
2120 static void set_license(struct module *mod, const char *license)
2123 license = "unspecified";
2125 if (!license_is_gpl_compatible(license)) {
2126 if (!test_taint(TAINT_PROPRIETARY_MODULE))
2127 printk(KERN_WARNING "%s: module license '%s' taints "
2128 "kernel.\n", mod->name, license);
2129 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2133 /* Parse tag=value strings from .modinfo section */
2134 static char *next_string(char *string, unsigned long *secsize)
2136 /* Skip non-zero chars */
2139 if ((*secsize)-- <= 1)
2143 /* Skip any zero padding. */
2144 while (!string[0]) {
2146 if ((*secsize)-- <= 1)
2152 static char *get_modinfo(struct load_info *info, const char *tag)
2155 unsigned int taglen = strlen(tag);
2156 Elf_Shdr *infosec = &info->sechdrs[info->index.info];
2157 unsigned long size = infosec->sh_size;
2159 for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) {
2160 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
2161 return p + taglen + 1;
2166 static void setup_modinfo(struct module *mod, struct load_info *info)
2168 struct module_attribute *attr;
2171 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2173 attr->setup(mod, get_modinfo(info, attr->attr.name));
2177 static void free_modinfo(struct module *mod)
2179 struct module_attribute *attr;
2182 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2188 #ifdef CONFIG_KALLSYMS
2190 /* lookup symbol in given range of kernel_symbols */
2191 static const struct kernel_symbol *lookup_symbol(const char *name,
2192 const struct kernel_symbol *start,
2193 const struct kernel_symbol *stop)
2195 return bsearch(name, start, stop - start,
2196 sizeof(struct kernel_symbol), cmp_name);
2199 static int is_exported(const char *name, unsigned long value,
2200 const struct module *mod)
2202 const struct kernel_symbol *ks;
2204 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
2206 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
2207 return ks != NULL && ks->value == value;
2211 static char elf_type(const Elf_Sym *sym, const struct load_info *info)
2213 const Elf_Shdr *sechdrs = info->sechdrs;
2215 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
2216 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
2221 if (sym->st_shndx == SHN_UNDEF)
2223 if (sym->st_shndx == SHN_ABS)
2225 if (sym->st_shndx >= SHN_LORESERVE)
2227 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
2229 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
2230 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
2231 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
2233 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
2238 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
2239 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
2244 if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name,
2251 static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
2254 const Elf_Shdr *sec;
2256 if (src->st_shndx == SHN_UNDEF
2257 || src->st_shndx >= shnum
2261 sec = sechdrs + src->st_shndx;
2262 if (!(sec->sh_flags & SHF_ALLOC)
2263 #ifndef CONFIG_KALLSYMS_ALL
2264 || !(sec->sh_flags & SHF_EXECINSTR)
2266 || (sec->sh_entsize & INIT_OFFSET_MASK))
2273 * We only allocate and copy the strings needed by the parts of symtab
2274 * we keep. This is simple, but has the effect of making multiple
2275 * copies of duplicates. We could be more sophisticated, see
2276 * linux-kernel thread starting with
2277 * <73defb5e4bca04a6431392cc341112b1@localhost>.
2279 static void layout_symtab(struct module *mod, struct load_info *info)
2281 Elf_Shdr *symsect = info->sechdrs + info->index.sym;
2282 Elf_Shdr *strsect = info->sechdrs + info->index.str;
2284 unsigned int i, nsrc, ndst, strtab_size;
2286 /* Put symbol section at end of init part of module. */
2287 symsect->sh_flags |= SHF_ALLOC;
2288 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
2289 info->index.sym) | INIT_OFFSET_MASK;
2290 pr_debug("\t%s\n", info->secstrings + symsect->sh_name);
2292 src = (void *)info->hdr + symsect->sh_offset;
2293 nsrc = symsect->sh_size / sizeof(*src);
2295 /* Compute total space required for the core symbols' strtab. */
2296 for (ndst = i = strtab_size = 1; i < nsrc; ++i, ++src)
2297 if (is_core_symbol(src, info->sechdrs, info->hdr->e_shnum)) {
2298 strtab_size += strlen(&info->strtab[src->st_name]) + 1;
2302 /* Append room for core symbols at end of core part. */
2303 info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
2304 info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym);
2305 mod->core_size += strtab_size;
2307 /* Put string table section at end of init part of module. */
2308 strsect->sh_flags |= SHF_ALLOC;
2309 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
2310 info->index.str) | INIT_OFFSET_MASK;
2311 pr_debug("\t%s\n", info->secstrings + strsect->sh_name);
2314 static void add_kallsyms(struct module *mod, const struct load_info *info)
2316 unsigned int i, ndst;
2320 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
2322 mod->symtab = (void *)symsec->sh_addr;
2323 mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym);
2324 /* Make sure we get permanent strtab: don't use info->strtab. */
2325 mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr;
2327 /* Set types up while we still have access to sections. */
2328 for (i = 0; i < mod->num_symtab; i++)
2329 mod->symtab[i].st_info = elf_type(&mod->symtab[i], info);
2331 mod->core_symtab = dst = mod->module_core + info->symoffs;
2332 mod->core_strtab = s = mod->module_core + info->stroffs;
2336 for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) {
2337 if (!is_core_symbol(src, info->sechdrs, info->hdr->e_shnum))
2341 dst[ndst++].st_name = s - mod->core_strtab;
2342 s += strlcpy(s, &mod->strtab[src->st_name], KSYM_NAME_LEN) + 1;
2344 mod->core_num_syms = ndst;
2347 static inline void layout_symtab(struct module *mod, struct load_info *info)
2351 static void add_kallsyms(struct module *mod, const struct load_info *info)
2354 #endif /* CONFIG_KALLSYMS */
2356 static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
2360 #ifdef CONFIG_DYNAMIC_DEBUG
2361 if (ddebug_add_module(debug, num, debug->modname))
2362 printk(KERN_ERR "dynamic debug error adding module: %s\n",
2367 static void dynamic_debug_remove(struct _ddebug *debug)
2370 ddebug_remove_module(debug->modname);
2373 void * __weak module_alloc(unsigned long size)
2375 return size == 0 ? NULL : vmalloc_exec(size);
2378 static void *module_alloc_update_bounds(unsigned long size)
2380 void *ret = module_alloc(size);
2383 mutex_lock(&module_mutex);
2384 /* Update module bounds. */
2385 if ((unsigned long)ret < module_addr_min)
2386 module_addr_min = (unsigned long)ret;
2387 if ((unsigned long)ret + size > module_addr_max)
2388 module_addr_max = (unsigned long)ret + size;
2389 mutex_unlock(&module_mutex);
2394 #ifdef CONFIG_DEBUG_KMEMLEAK
2395 static void kmemleak_load_module(const struct module *mod,
2396 const struct load_info *info)
2400 /* only scan the sections containing data */
2401 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
2403 for (i = 1; i < info->hdr->e_shnum; i++) {
2404 const char *name = info->secstrings + info->sechdrs[i].sh_name;
2405 if (!(info->sechdrs[i].sh_flags & SHF_ALLOC))
2407 if (!strstarts(name, ".data") && !strstarts(name, ".bss"))
2410 kmemleak_scan_area((void *)info->sechdrs[i].sh_addr,
2411 info->sechdrs[i].sh_size, GFP_KERNEL);
2415 static inline void kmemleak_load_module(const struct module *mod,
2416 const struct load_info *info)
2421 #ifdef CONFIG_MODULE_SIG
2422 static int module_sig_check(struct load_info *info,
2423 const void *mod, unsigned long *len)
2426 const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1;
2427 const void *p = mod, *end = mod + *len;
2429 /* Poor man's memmem. */
2430 while ((p = memchr(p, MODULE_SIG_STRING[0], end - p))) {
2431 if (p + markerlen > end)
2434 if (memcmp(p, MODULE_SIG_STRING, markerlen) == 0) {
2435 const void *sig = p + markerlen;
2436 /* Truncate module up to signature. */
2438 err = mod_verify_sig(mod, *len, sig, end - sig);
2445 info->sig_ok = true;
2449 /* Not having a signature is only an error if we're strict. */
2450 if (err == -ENOKEY && !sig_enforce)
2455 #else /* !CONFIG_MODULE_SIG */
2456 static int module_sig_check(struct load_info *info,
2457 void *mod, unsigned long *len)
2461 #endif /* !CONFIG_MODULE_SIG */
2463 /* Sets info->hdr, info->len and info->sig_ok. */
2464 static int copy_and_check(struct load_info *info,
2465 const void __user *umod, unsigned long len,
2466 const char __user *uargs)
2471 if (len < sizeof(*hdr))
2474 /* Suck in entire file: we'll want most of it. */
2475 if ((hdr = vmalloc(len)) == NULL)
2478 if (copy_from_user(hdr, umod, len) != 0) {
2483 err = module_sig_check(info, hdr, &len);
2487 /* Sanity checks against insmoding binaries or wrong arch,
2488 weird elf version */
2489 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
2490 || hdr->e_type != ET_REL
2491 || !elf_check_arch(hdr)
2492 || hdr->e_shentsize != sizeof(Elf_Shdr)) {
2497 if (hdr->e_shoff >= len ||
2498 hdr->e_shnum * sizeof(Elf_Shdr) > len - hdr->e_shoff) {
2512 static void free_copy(struct load_info *info)
2517 static int rewrite_section_headers(struct load_info *info)
2521 /* This should always be true, but let's be sure. */
2522 info->sechdrs[0].sh_addr = 0;
2524 for (i = 1; i < info->hdr->e_shnum; i++) {
2525 Elf_Shdr *shdr = &info->sechdrs[i];
2526 if (shdr->sh_type != SHT_NOBITS
2527 && info->len < shdr->sh_offset + shdr->sh_size) {
2528 printk(KERN_ERR "Module len %lu truncated\n",
2533 /* Mark all sections sh_addr with their address in the
2535 shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset;
2537 #ifndef CONFIG_MODULE_UNLOAD
2538 /* Don't load .exit sections */
2539 if (strstarts(info->secstrings+shdr->sh_name, ".exit"))
2540 shdr->sh_flags &= ~(unsigned long)SHF_ALLOC;
2544 /* Track but don't keep modinfo and version sections. */
2545 info->index.vers = find_sec(info, "__versions");
2546 info->index.info = find_sec(info, ".modinfo");
2547 info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC;
2548 info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC;
2553 * Set up our basic convenience variables (pointers to section headers,
2554 * search for module section index etc), and do some basic section
2557 * Return the temporary module pointer (we'll replace it with the final
2558 * one when we move the module sections around).
2560 static struct module *setup_load_info(struct load_info *info)
2566 /* Set up the convenience variables */
2567 info->sechdrs = (void *)info->hdr + info->hdr->e_shoff;
2568 info->secstrings = (void *)info->hdr
2569 + info->sechdrs[info->hdr->e_shstrndx].sh_offset;
2571 err = rewrite_section_headers(info);
2573 return ERR_PTR(err);
2575 /* Find internal symbols and strings. */
2576 for (i = 1; i < info->hdr->e_shnum; i++) {
2577 if (info->sechdrs[i].sh_type == SHT_SYMTAB) {
2578 info->index.sym = i;
2579 info->index.str = info->sechdrs[i].sh_link;
2580 info->strtab = (char *)info->hdr
2581 + info->sechdrs[info->index.str].sh_offset;
2586 info->index.mod = find_sec(info, ".gnu.linkonce.this_module");
2587 if (!info->index.mod) {
2588 printk(KERN_WARNING "No module found in object\n");
2589 return ERR_PTR(-ENOEXEC);
2591 /* This is temporary: point mod into copy of data. */
2592 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
2594 if (info->index.sym == 0) {
2595 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2597 return ERR_PTR(-ENOEXEC);
2600 info->index.pcpu = find_pcpusec(info);
2602 /* Check module struct version now, before we try to use module. */
2603 if (!check_modstruct_version(info->sechdrs, info->index.vers, mod))
2604 return ERR_PTR(-ENOEXEC);
2609 static int check_modinfo(struct module *mod, struct load_info *info)
2611 const char *modmagic = get_modinfo(info, "vermagic");
2614 /* This is allowed: modprobe --force will invalidate it. */
2616 err = try_to_force_load(mod, "bad vermagic");
2619 } else if (!same_magic(modmagic, vermagic, info->index.vers)) {
2620 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2621 mod->name, modmagic, vermagic);
2625 if (!get_modinfo(info, "intree"))
2626 add_taint_module(mod, TAINT_OOT_MODULE);
2628 if (get_modinfo(info, "staging")) {
2629 add_taint_module(mod, TAINT_CRAP);
2630 printk(KERN_WARNING "%s: module is from the staging directory,"
2631 " the quality is unknown, you have been warned.\n",
2635 /* Set up license info based on the info section */
2636 set_license(mod, get_modinfo(info, "license"));
2641 static void find_module_sections(struct module *mod, struct load_info *info)
2643 mod->kp = section_objs(info, "__param",
2644 sizeof(*mod->kp), &mod->num_kp);
2645 mod->syms = section_objs(info, "__ksymtab",
2646 sizeof(*mod->syms), &mod->num_syms);
2647 mod->crcs = section_addr(info, "__kcrctab");
2648 mod->gpl_syms = section_objs(info, "__ksymtab_gpl",
2649 sizeof(*mod->gpl_syms),
2650 &mod->num_gpl_syms);
2651 mod->gpl_crcs = section_addr(info, "__kcrctab_gpl");
2652 mod->gpl_future_syms = section_objs(info,
2653 "__ksymtab_gpl_future",
2654 sizeof(*mod->gpl_future_syms),
2655 &mod->num_gpl_future_syms);
2656 mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future");
2658 #ifdef CONFIG_UNUSED_SYMBOLS
2659 mod->unused_syms = section_objs(info, "__ksymtab_unused",
2660 sizeof(*mod->unused_syms),
2661 &mod->num_unused_syms);
2662 mod->unused_crcs = section_addr(info, "__kcrctab_unused");
2663 mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl",
2664 sizeof(*mod->unused_gpl_syms),
2665 &mod->num_unused_gpl_syms);
2666 mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl");
2668 #ifdef CONFIG_CONSTRUCTORS
2669 mod->ctors = section_objs(info, ".ctors",
2670 sizeof(*mod->ctors), &mod->num_ctors);
2673 #ifdef CONFIG_TRACEPOINTS
2674 mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs",
2675 sizeof(*mod->tracepoints_ptrs),
2676 &mod->num_tracepoints);
2678 #ifdef HAVE_JUMP_LABEL
2679 mod->jump_entries = section_objs(info, "__jump_table",
2680 sizeof(*mod->jump_entries),
2681 &mod->num_jump_entries);
2683 #ifdef CONFIG_EVENT_TRACING
2684 mod->trace_events = section_objs(info, "_ftrace_events",
2685 sizeof(*mod->trace_events),
2686 &mod->num_trace_events);
2688 * This section contains pointers to allocated objects in the trace
2689 * code and not scanning it leads to false positives.
2691 kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
2692 mod->num_trace_events, GFP_KERNEL);
2694 #ifdef CONFIG_TRACING
2695 mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt",
2696 sizeof(*mod->trace_bprintk_fmt_start),
2697 &mod->num_trace_bprintk_fmt);
2699 * This section contains pointers to allocated objects in the trace
2700 * code and not scanning it leads to false positives.
2702 kmemleak_scan_area(mod->trace_bprintk_fmt_start,
2703 sizeof(*mod->trace_bprintk_fmt_start) *
2704 mod->num_trace_bprintk_fmt, GFP_KERNEL);
2706 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2707 /* sechdrs[0].sh_size is always zero */
2708 mod->ftrace_callsites = section_objs(info, "__mcount_loc",
2709 sizeof(*mod->ftrace_callsites),
2710 &mod->num_ftrace_callsites);
2713 mod->extable = section_objs(info, "__ex_table",
2714 sizeof(*mod->extable), &mod->num_exentries);
2716 if (section_addr(info, "__obsparm"))
2717 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2720 info->debug = section_objs(info, "__verbose",
2721 sizeof(*info->debug), &info->num_debug);
2724 static int move_module(struct module *mod, struct load_info *info)
2729 /* Do the allocs. */
2730 ptr = module_alloc_update_bounds(mod->core_size);
2732 * The pointer to this block is stored in the module structure
2733 * which is inside the block. Just mark it as not being a
2736 kmemleak_not_leak(ptr);
2740 memset(ptr, 0, mod->core_size);
2741 mod->module_core = ptr;
2743 ptr = module_alloc_update_bounds(mod->init_size);
2745 * The pointer to this block is stored in the module structure
2746 * which is inside the block. This block doesn't need to be
2747 * scanned as it contains data and code that will be freed
2748 * after the module is initialized.
2750 kmemleak_ignore(ptr);
2751 if (!ptr && mod->init_size) {
2752 module_free(mod, mod->module_core);
2755 memset(ptr, 0, mod->init_size);
2756 mod->module_init = ptr;
2758 /* Transfer each section which specifies SHF_ALLOC */
2759 pr_debug("final section addresses:\n");
2760 for (i = 0; i < info->hdr->e_shnum; i++) {
2762 Elf_Shdr *shdr = &info->sechdrs[i];
2764 if (!(shdr->sh_flags & SHF_ALLOC))
2767 if (shdr->sh_entsize & INIT_OFFSET_MASK)
2768 dest = mod->module_init
2769 + (shdr->sh_entsize & ~INIT_OFFSET_MASK);
2771 dest = mod->module_core + shdr->sh_entsize;
2773 if (shdr->sh_type != SHT_NOBITS)
2774 memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size);
2775 /* Update sh_addr to point to copy in image. */
2776 shdr->sh_addr = (unsigned long)dest;
2777 pr_debug("\t0x%lx %s\n",
2778 (long)shdr->sh_addr, info->secstrings + shdr->sh_name);
2784 static int check_module_license_and_versions(struct module *mod)
2787 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2788 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2789 * using GPL-only symbols it needs.
2791 if (strcmp(mod->name, "ndiswrapper") == 0)
2792 add_taint(TAINT_PROPRIETARY_MODULE);
2794 /* driverloader was caught wrongly pretending to be under GPL */
2795 if (strcmp(mod->name, "driverloader") == 0)
2796 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2798 /* lve claims to be GPL but upstream won't provide source */
2799 if (strcmp(mod->name, "lve") == 0)
2800 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2802 #ifdef CONFIG_MODVERSIONS
2803 if ((mod->num_syms && !mod->crcs)
2804 || (mod->num_gpl_syms && !mod->gpl_crcs)
2805 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2806 #ifdef CONFIG_UNUSED_SYMBOLS
2807 || (mod->num_unused_syms && !mod->unused_crcs)
2808 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2811 return try_to_force_load(mod,
2812 "no versions for exported symbols");
2818 static void flush_module_icache(const struct module *mod)
2820 mm_segment_t old_fs;
2822 /* flush the icache in correct context */
2827 * Flush the instruction cache, since we've played with text.
2828 * Do it before processing of module parameters, so the module
2829 * can provide parameter accessor functions of its own.
2831 if (mod->module_init)
2832 flush_icache_range((unsigned long)mod->module_init,
2833 (unsigned long)mod->module_init
2835 flush_icache_range((unsigned long)mod->module_core,
2836 (unsigned long)mod->module_core + mod->core_size);
2841 int __weak module_frob_arch_sections(Elf_Ehdr *hdr,
2849 static struct module *layout_and_allocate(struct load_info *info)
2851 /* Module within temporary copy. */
2856 mod = setup_load_info(info);
2860 err = check_modinfo(mod, info);
2862 return ERR_PTR(err);
2864 /* Allow arches to frob section contents and sizes. */
2865 err = module_frob_arch_sections(info->hdr, info->sechdrs,
2866 info->secstrings, mod);
2870 pcpusec = &info->sechdrs[info->index.pcpu];
2871 if (pcpusec->sh_size) {
2872 /* We have a special allocation for this section. */
2873 err = percpu_modalloc(mod,
2874 pcpusec->sh_size, pcpusec->sh_addralign);
2877 pcpusec->sh_flags &= ~(unsigned long)SHF_ALLOC;
2880 /* Determine total sizes, and put offsets in sh_entsize. For now
2881 this is done generically; there doesn't appear to be any
2882 special cases for the architectures. */
2883 layout_sections(mod, info);
2884 layout_symtab(mod, info);
2886 /* Allocate and move to the final place */
2887 err = move_module(mod, info);
2891 /* Module has been copied to its final place now: return it. */
2892 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
2893 kmemleak_load_module(mod, info);
2897 percpu_modfree(mod);
2899 return ERR_PTR(err);
2902 /* mod is no longer valid after this! */
2903 static void module_deallocate(struct module *mod, struct load_info *info)
2905 percpu_modfree(mod);
2906 module_free(mod, mod->module_init);
2907 module_free(mod, mod->module_core);
2910 int __weak module_finalize(const Elf_Ehdr *hdr,
2911 const Elf_Shdr *sechdrs,
2917 static int post_relocation(struct module *mod, const struct load_info *info)
2919 /* Sort exception table now relocations are done. */
2920 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2922 /* Copy relocated percpu area over. */
2923 percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr,
2924 info->sechdrs[info->index.pcpu].sh_size);
2926 /* Setup kallsyms-specific fields. */
2927 add_kallsyms(mod, info);
2929 /* Arch-specific module finalizing. */
2930 return module_finalize(info->hdr, info->sechdrs, mod);
2933 /* Is this module of this name done loading? No locks held. */
2934 static bool finished_loading(const char *name)
2939 mutex_lock(&module_mutex);
2940 mod = find_module(name);
2941 ret = !mod || mod->state != MODULE_STATE_COMING;
2942 mutex_unlock(&module_mutex);
2947 /* Allocate and load the module: note that size of section 0 is always
2948 zero, and we rely on this for optional sections. */
2949 static struct module *load_module(void __user *umod,
2951 const char __user *uargs)
2953 struct load_info info = { NULL, };
2954 struct module *mod, *old;
2957 pr_debug("load_module: umod=%p, len=%lu, uargs=%p\n",
2960 /* Copy in the blobs from userspace, check they are vaguely sane. */
2961 err = copy_and_check(&info, umod, len, uargs);
2963 return ERR_PTR(err);
2965 /* Figure out module layout, and allocate all the memory. */
2966 mod = layout_and_allocate(&info);
2972 #ifdef CONFIG_MODULE_SIG
2973 mod->sig_ok = info.sig_ok;
2975 add_taint_module(mod, TAINT_FORCED_MODULE);
2978 /* Now module is in final location, initialize linked lists, etc. */
2979 err = module_unload_init(mod);
2983 /* Now we've got everything in the final locations, we can
2984 * find optional sections. */
2985 find_module_sections(mod, &info);
2987 err = check_module_license_and_versions(mod);
2991 /* Set up MODINFO_ATTR fields */
2992 setup_modinfo(mod, &info);
2994 /* Fix up syms, so that st_value is a pointer to location. */
2995 err = simplify_symbols(mod, &info);
2999 err = apply_relocations(mod, &info);
3003 err = post_relocation(mod, &info);
3007 flush_module_icache(mod);
3009 /* Now copy in args */
3010 mod->args = strndup_user(uargs, ~0UL >> 1);
3011 if (IS_ERR(mod->args)) {
3012 err = PTR_ERR(mod->args);
3013 goto free_arch_cleanup;
3016 /* Mark state as coming so strong_try_module_get() ignores us. */
3017 mod->state = MODULE_STATE_COMING;
3019 /* Now sew it into the lists so we can get lockdep and oops
3020 * info during argument parsing. No one should access us, since
3021 * strong_try_module_get() will fail.
3022 * lockdep/oops can run asynchronous, so use the RCU list insertion
3023 * function to insert in a way safe to concurrent readers.
3024 * The mutex protects against concurrent writers.
3027 mutex_lock(&module_mutex);
3028 if ((old = find_module(mod->name)) != NULL) {
3029 if (old->state == MODULE_STATE_COMING) {
3030 /* Wait in case it fails to load. */
3031 mutex_unlock(&module_mutex);
3032 err = wait_event_interruptible(module_wq,
3033 finished_loading(mod->name));
3035 goto free_arch_cleanup;
3042 /* This has to be done once we're sure module name is unique. */
3043 dynamic_debug_setup(info.debug, info.num_debug);
3045 /* Find duplicate symbols */
3046 err = verify_export_symbols(mod);
3050 module_bug_finalize(info.hdr, info.sechdrs, mod);
3051 list_add_rcu(&mod->list, &modules);
3052 mutex_unlock(&module_mutex);
3054 /* Module is ready to execute: parsing args may do that. */
3055 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp,
3056 -32768, 32767, &ddebug_dyndbg_module_param_cb);
3060 /* Link in to syfs. */
3061 err = mod_sysfs_setup(mod, &info, mod->kp, mod->num_kp);
3065 /* Get rid of temporary copy. */
3069 trace_module_load(mod);
3073 mutex_lock(&module_mutex);
3074 /* Unlink carefully: kallsyms could be walking list. */
3075 list_del_rcu(&mod->list);
3076 module_bug_cleanup(mod);
3077 wake_up_all(&module_wq);
3079 dynamic_debug_remove(info.debug);
3081 mutex_unlock(&module_mutex);
3082 synchronize_sched();
3085 module_arch_cleanup(mod);
3089 module_unload_free(mod);
3091 module_deallocate(mod, &info);
3094 return ERR_PTR(err);
3097 /* Call module constructors. */
3098 static void do_mod_ctors(struct module *mod)
3100 #ifdef CONFIG_CONSTRUCTORS
3103 for (i = 0; i < mod->num_ctors; i++)
3108 /* This is where the real work happens */
3109 SYSCALL_DEFINE3(init_module, void __user *, umod,
3110 unsigned long, len, const char __user *, uargs)
3115 /* Must have permission */
3116 if (!capable(CAP_SYS_MODULE) || modules_disabled)
3119 /* Do all the hard work */
3120 mod = load_module(umod, len, uargs);
3122 return PTR_ERR(mod);
3124 blocking_notifier_call_chain(&module_notify_list,
3125 MODULE_STATE_COMING, mod);
3127 /* Set RO and NX regions for core */
3128 set_section_ro_nx(mod->module_core,
3129 mod->core_text_size,
3133 /* Set RO and NX regions for init */
3134 set_section_ro_nx(mod->module_init,
3135 mod->init_text_size,
3140 /* Start the module */
3141 if (mod->init != NULL)
3142 ret = do_one_initcall(mod->init);
3144 /* Init routine failed: abort. Try to protect us from
3145 buggy refcounters. */
3146 mod->state = MODULE_STATE_GOING;
3147 synchronize_sched();
3149 blocking_notifier_call_chain(&module_notify_list,
3150 MODULE_STATE_GOING, mod);
3152 wake_up_all(&module_wq);
3157 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
3158 "%s: loading module anyway...\n",
3159 __func__, mod->name, ret,
3164 /* Now it's a first class citizen! */
3165 mod->state = MODULE_STATE_LIVE;
3166 blocking_notifier_call_chain(&module_notify_list,
3167 MODULE_STATE_LIVE, mod);
3169 /* We need to finish all async code before the module init sequence is done */
3170 async_synchronize_full();
3172 mutex_lock(&module_mutex);
3173 /* Drop initial reference. */
3175 trim_init_extable(mod);
3176 #ifdef CONFIG_KALLSYMS
3177 mod->num_symtab = mod->core_num_syms;
3178 mod->symtab = mod->core_symtab;
3179 mod->strtab = mod->core_strtab;
3181 unset_module_init_ro_nx(mod);
3182 module_free(mod, mod->module_init);
3183 mod->module_init = NULL;
3185 mod->init_ro_size = 0;
3186 mod->init_text_size = 0;
3187 mutex_unlock(&module_mutex);
3188 wake_up_all(&module_wq);
3193 static inline int within(unsigned long addr, void *start, unsigned long size)
3195 return ((void *)addr >= start && (void *)addr < start + size);
3198 #ifdef CONFIG_KALLSYMS
3200 * This ignores the intensely annoying "mapping symbols" found
3201 * in ARM ELF files: $a, $t and $d.
3203 static inline int is_arm_mapping_symbol(const char *str)
3205 return str[0] == '$' && strchr("atd", str[1])
3206 && (str[2] == '\0' || str[2] == '.');
3209 static const char *get_ksymbol(struct module *mod,
3211 unsigned long *size,
3212 unsigned long *offset)
3214 unsigned int i, best = 0;
3215 unsigned long nextval;
3217 /* At worse, next value is at end of module */
3218 if (within_module_init(addr, mod))
3219 nextval = (unsigned long)mod->module_init+mod->init_text_size;
3221 nextval = (unsigned long)mod->module_core+mod->core_text_size;
3223 /* Scan for closest preceding symbol, and next symbol. (ELF
3224 starts real symbols at 1). */
3225 for (i = 1; i < mod->num_symtab; i++) {
3226 if (mod->symtab[i].st_shndx == SHN_UNDEF)
3229 /* We ignore unnamed symbols: they're uninformative
3230 * and inserted at a whim. */
3231 if (mod->symtab[i].st_value <= addr
3232 && mod->symtab[i].st_value > mod->symtab[best].st_value
3233 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
3234 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
3236 if (mod->symtab[i].st_value > addr
3237 && mod->symtab[i].st_value < nextval
3238 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
3239 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
3240 nextval = mod->symtab[i].st_value;
3247 *size = nextval - mod->symtab[best].st_value;
3249 *offset = addr - mod->symtab[best].st_value;
3250 return mod->strtab + mod->symtab[best].st_name;
3253 /* For kallsyms to ask for address resolution. NULL means not found. Careful
3254 * not to lock to avoid deadlock on oopses, simply disable preemption. */
3255 const char *module_address_lookup(unsigned long addr,
3256 unsigned long *size,
3257 unsigned long *offset,
3262 const char *ret = NULL;
3265 list_for_each_entry_rcu(mod, &modules, list) {
3266 if (within_module_init(addr, mod) ||
3267 within_module_core(addr, mod)) {
3269 *modname = mod->name;
3270 ret = get_ksymbol(mod, addr, size, offset);
3274 /* Make a copy in here where it's safe */
3276 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
3283 int lookup_module_symbol_name(unsigned long addr, char *symname)
3288 list_for_each_entry_rcu(mod, &modules, list) {
3289 if (within_module_init(addr, mod) ||
3290 within_module_core(addr, mod)) {
3293 sym = get_ksymbol(mod, addr, NULL, NULL);
3296 strlcpy(symname, sym, KSYM_NAME_LEN);
3306 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
3307 unsigned long *offset, char *modname, char *name)
3312 list_for_each_entry_rcu(mod, &modules, list) {
3313 if (within_module_init(addr, mod) ||
3314 within_module_core(addr, mod)) {
3317 sym = get_ksymbol(mod, addr, size, offset);
3321 strlcpy(modname, mod->name, MODULE_NAME_LEN);
3323 strlcpy(name, sym, KSYM_NAME_LEN);
3333 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
3334 char *name, char *module_name, int *exported)
3339 list_for_each_entry_rcu(mod, &modules, list) {
3340 if (symnum < mod->num_symtab) {
3341 *value = mod->symtab[symnum].st_value;
3342 *type = mod->symtab[symnum].st_info;
3343 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
3345 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
3346 *exported = is_exported(name, *value, mod);
3350 symnum -= mod->num_symtab;
3356 static unsigned long mod_find_symname(struct module *mod, const char *name)
3360 for (i = 0; i < mod->num_symtab; i++)
3361 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
3362 mod->symtab[i].st_info != 'U')
3363 return mod->symtab[i].st_value;
3367 /* Look for this name: can be of form module:name. */
3368 unsigned long module_kallsyms_lookup_name(const char *name)
3372 unsigned long ret = 0;
3374 /* Don't lock: we're in enough trouble already. */
3376 if ((colon = strchr(name, ':')) != NULL) {
3378 if ((mod = find_module(name)) != NULL)
3379 ret = mod_find_symname(mod, colon+1);
3382 list_for_each_entry_rcu(mod, &modules, list)
3383 if ((ret = mod_find_symname(mod, name)) != 0)
3390 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
3391 struct module *, unsigned long),
3398 list_for_each_entry(mod, &modules, list) {
3399 for (i = 0; i < mod->num_symtab; i++) {
3400 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
3401 mod, mod->symtab[i].st_value);
3408 #endif /* CONFIG_KALLSYMS */
3410 static char *module_flags(struct module *mod, char *buf)
3415 mod->state == MODULE_STATE_GOING ||
3416 mod->state == MODULE_STATE_COMING) {
3418 bx += module_flags_taint(mod, buf + bx);
3419 /* Show a - for module-is-being-unloaded */
3420 if (mod->state == MODULE_STATE_GOING)
3422 /* Show a + for module-is-being-loaded */
3423 if (mod->state == MODULE_STATE_COMING)
3432 #ifdef CONFIG_PROC_FS
3433 /* Called by the /proc file system to return a list of modules. */
3434 static void *m_start(struct seq_file *m, loff_t *pos)
3436 mutex_lock(&module_mutex);
3437 return seq_list_start(&modules, *pos);
3440 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
3442 return seq_list_next(p, &modules, pos);
3445 static void m_stop(struct seq_file *m, void *p)
3447 mutex_unlock(&module_mutex);
3450 static int m_show(struct seq_file *m, void *p)
3452 struct module *mod = list_entry(p, struct module, list);
3455 seq_printf(m, "%s %u",
3456 mod->name, mod->init_size + mod->core_size);
3457 print_unload_info(m, mod);
3459 /* Informative for users. */
3460 seq_printf(m, " %s",
3461 mod->state == MODULE_STATE_GOING ? "Unloading":
3462 mod->state == MODULE_STATE_COMING ? "Loading":
3464 /* Used by oprofile and other similar tools. */
3465 seq_printf(m, " 0x%pK", mod->module_core);
3469 seq_printf(m, " %s", module_flags(mod, buf));
3471 seq_printf(m, "\n");
3475 /* Format: modulename size refcount deps address
3477 Where refcount is a number or -, and deps is a comma-separated list
3480 static const struct seq_operations modules_op = {
3487 static int modules_open(struct inode *inode, struct file *file)
3489 return seq_open(file, &modules_op);
3492 static const struct file_operations proc_modules_operations = {
3493 .open = modules_open,
3495 .llseek = seq_lseek,
3496 .release = seq_release,
3499 static int __init proc_modules_init(void)
3501 proc_create("modules", 0, NULL, &proc_modules_operations);
3504 module_init(proc_modules_init);
3507 /* Given an address, look for it in the module exception tables. */
3508 const struct exception_table_entry *search_module_extables(unsigned long addr)
3510 const struct exception_table_entry *e = NULL;
3514 list_for_each_entry_rcu(mod, &modules, list) {
3515 if (mod->num_exentries == 0)
3518 e = search_extable(mod->extable,
3519 mod->extable + mod->num_exentries - 1,
3526 /* Now, if we found one, we are running inside it now, hence
3527 we cannot unload the module, hence no refcnt needed. */
3532 * is_module_address - is this address inside a module?
3533 * @addr: the address to check.
3535 * See is_module_text_address() if you simply want to see if the address
3536 * is code (not data).
3538 bool is_module_address(unsigned long addr)
3543 ret = __module_address(addr) != NULL;
3550 * __module_address - get the module which contains an address.
3551 * @addr: the address.
3553 * Must be called with preempt disabled or module mutex held so that
3554 * module doesn't get freed during this.
3556 struct module *__module_address(unsigned long addr)
3560 if (addr < module_addr_min || addr > module_addr_max)
3563 list_for_each_entry_rcu(mod, &modules, list)
3564 if (within_module_core(addr, mod)
3565 || within_module_init(addr, mod))
3569 EXPORT_SYMBOL_GPL(__module_address);
3572 * is_module_text_address - is this address inside module code?
3573 * @addr: the address to check.
3575 * See is_module_address() if you simply want to see if the address is
3576 * anywhere in a module. See kernel_text_address() for testing if an
3577 * address corresponds to kernel or module code.
3579 bool is_module_text_address(unsigned long addr)
3584 ret = __module_text_address(addr) != NULL;
3591 * __module_text_address - get the module whose code contains an address.
3592 * @addr: the address.
3594 * Must be called with preempt disabled or module mutex held so that
3595 * module doesn't get freed during this.
3597 struct module *__module_text_address(unsigned long addr)
3599 struct module *mod = __module_address(addr);
3601 /* Make sure it's within the text section. */
3602 if (!within(addr, mod->module_init, mod->init_text_size)
3603 && !within(addr, mod->module_core, mod->core_text_size))
3608 EXPORT_SYMBOL_GPL(__module_text_address);
3610 /* Don't grab lock, we're oopsing. */
3611 void print_modules(void)
3616 printk(KERN_DEFAULT "Modules linked in:");
3617 /* Most callers should already have preempt disabled, but make sure */
3619 list_for_each_entry_rcu(mod, &modules, list)
3620 printk(" %s%s", mod->name, module_flags(mod, buf));
3622 if (last_unloaded_module[0])
3623 printk(" [last unloaded: %s]", last_unloaded_module);
3627 #ifdef CONFIG_MODVERSIONS
3628 /* Generate the signature for all relevant module structures here.
3629 * If these change, we don't want to try to parse the module. */
3630 void module_layout(struct module *mod,
3631 struct modversion_info *ver,
3632 struct kernel_param *kp,
3633 struct kernel_symbol *ks,
3634 struct tracepoint * const *tp)
3637 EXPORT_SYMBOL(module_layout);