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>
24 #include <linux/file.h>
26 #include <linux/sysfs.h>
27 #include <linux/kernel.h>
28 #include <linux/slab.h>
29 #include <linux/vmalloc.h>
30 #include <linux/elf.h>
31 #include <linux/proc_fs.h>
32 #include <linux/security.h>
33 #include <linux/seq_file.h>
34 #include <linux/syscalls.h>
35 #include <linux/fcntl.h>
36 #include <linux/rcupdate.h>
37 #include <linux/capability.h>
38 #include <linux/cpu.h>
39 #include <linux/moduleparam.h>
40 #include <linux/errno.h>
41 #include <linux/err.h>
42 #include <linux/vermagic.h>
43 #include <linux/notifier.h>
44 #include <linux/sched.h>
45 #include <linux/stop_machine.h>
46 #include <linux/device.h>
47 #include <linux/string.h>
48 #include <linux/mutex.h>
49 #include <linux/rculist.h>
50 #include <asm/uaccess.h>
51 #include <asm/cacheflush.h>
52 #include <asm/mmu_context.h>
53 #include <linux/license.h>
54 #include <asm/sections.h>
55 #include <linux/tracepoint.h>
56 #include <linux/ftrace.h>
57 #include <linux/async.h>
58 #include <linux/percpu.h>
59 #include <linux/kmemleak.h>
60 #include <linux/jump_label.h>
61 #include <linux/pfn.h>
62 #include <linux/bsearch.h>
63 #include <linux/fips.h>
64 #include <uapi/linux/module.h>
65 #include "module-internal.h"
67 #define CREATE_TRACE_POINTS
68 #include <trace/events/module.h>
70 #ifndef ARCH_SHF_SMALL
71 #define ARCH_SHF_SMALL 0
75 * Modules' sections will be aligned on page boundaries
76 * to ensure complete separation of code and data, but
77 * only when CONFIG_DEBUG_SET_MODULE_RONX=y
79 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
80 # define debug_align(X) ALIGN(X, PAGE_SIZE)
82 # define debug_align(X) (X)
86 * Given BASE and SIZE this macro calculates the number of pages the
87 * memory regions occupies
89 #define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \
90 (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \
91 PFN_DOWN((unsigned long)BASE) + 1) \
94 /* If this is set, the section belongs in the init part of the module */
95 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
99 * 1) List of modules (also safely readable with preempt_disable),
100 * 2) module_use links,
101 * 3) module_addr_min/module_addr_max.
102 * (delete uses stop_machine/add uses RCU list operations). */
103 DEFINE_MUTEX(module_mutex);
104 EXPORT_SYMBOL_GPL(module_mutex);
105 static LIST_HEAD(modules);
106 #ifdef CONFIG_KGDB_KDB
107 struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
108 #endif /* CONFIG_KGDB_KDB */
110 #ifdef CONFIG_MODULE_SIG
111 #ifdef CONFIG_MODULE_SIG_FORCE
112 static bool sig_enforce = true;
114 static bool sig_enforce = false;
116 static int param_set_bool_enable_only(const char *val,
117 const struct kernel_param *kp)
121 struct kernel_param dummy_kp = *kp;
123 dummy_kp.arg = &test;
125 err = param_set_bool(val, &dummy_kp);
129 /* Don't let them unset it once it's set! */
130 if (!test && sig_enforce)
138 static const struct kernel_param_ops param_ops_bool_enable_only = {
139 .set = param_set_bool_enable_only,
140 .get = param_get_bool,
142 #define param_check_bool_enable_only param_check_bool
144 module_param(sig_enforce, bool_enable_only, 0644);
145 #endif /* !CONFIG_MODULE_SIG_FORCE */
146 #endif /* CONFIG_MODULE_SIG */
148 /* Block module loading/unloading? */
149 int modules_disabled = 0;
150 core_param(nomodule, modules_disabled, bint, 0);
152 /* Waiting for a module to finish initializing? */
153 static DECLARE_WAIT_QUEUE_HEAD(module_wq);
155 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
157 /* Bounds of module allocation, for speeding __module_address.
158 * Protected by module_mutex. */
159 static unsigned long module_addr_min = -1UL, module_addr_max = 0;
161 int register_module_notifier(struct notifier_block * nb)
163 return blocking_notifier_chain_register(&module_notify_list, nb);
165 EXPORT_SYMBOL(register_module_notifier);
167 int unregister_module_notifier(struct notifier_block * nb)
169 return blocking_notifier_chain_unregister(&module_notify_list, nb);
171 EXPORT_SYMBOL(unregister_module_notifier);
177 char *secstrings, *strtab;
178 unsigned long symoffs, stroffs;
179 struct _ddebug *debug;
180 unsigned int num_debug;
183 unsigned int sym, str, mod, vers, info, pcpu;
187 /* We require a truly strong try_module_get(): 0 means failure due to
188 ongoing or failed initialization etc. */
189 static inline int strong_try_module_get(struct module *mod)
191 BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED);
192 if (mod && mod->state == MODULE_STATE_COMING)
194 if (try_module_get(mod))
200 static inline void add_taint_module(struct module *mod, unsigned flag,
201 enum lockdep_ok lockdep_ok)
203 add_taint(flag, lockdep_ok);
204 mod->taints |= (1U << flag);
208 * A thread that wants to hold a reference to a module only while it
209 * is running can call this to safely exit. nfsd and lockd use this.
211 void __module_put_and_exit(struct module *mod, long code)
216 EXPORT_SYMBOL(__module_put_and_exit);
218 /* Find a module section: 0 means not found. */
219 static unsigned int find_sec(const struct load_info *info, const char *name)
223 for (i = 1; i < info->hdr->e_shnum; i++) {
224 Elf_Shdr *shdr = &info->sechdrs[i];
225 /* Alloc bit cleared means "ignore it." */
226 if ((shdr->sh_flags & SHF_ALLOC)
227 && strcmp(info->secstrings + shdr->sh_name, name) == 0)
233 /* Find a module section, or NULL. */
234 static void *section_addr(const struct load_info *info, const char *name)
236 /* Section 0 has sh_addr 0. */
237 return (void *)info->sechdrs[find_sec(info, name)].sh_addr;
240 /* Find a module section, or NULL. Fill in number of "objects" in section. */
241 static void *section_objs(const struct load_info *info,
246 unsigned int sec = find_sec(info, name);
248 /* Section 0 has sh_addr 0 and sh_size 0. */
249 *num = info->sechdrs[sec].sh_size / object_size;
250 return (void *)info->sechdrs[sec].sh_addr;
253 /* Provided by the linker */
254 extern const struct kernel_symbol __start___ksymtab[];
255 extern const struct kernel_symbol __stop___ksymtab[];
256 extern const struct kernel_symbol __start___ksymtab_gpl[];
257 extern const struct kernel_symbol __stop___ksymtab_gpl[];
258 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
259 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
260 extern const unsigned long __start___kcrctab[];
261 extern const unsigned long __start___kcrctab_gpl[];
262 extern const unsigned long __start___kcrctab_gpl_future[];
263 #ifdef CONFIG_UNUSED_SYMBOLS
264 extern const struct kernel_symbol __start___ksymtab_unused[];
265 extern const struct kernel_symbol __stop___ksymtab_unused[];
266 extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
267 extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
268 extern const unsigned long __start___kcrctab_unused[];
269 extern const unsigned long __start___kcrctab_unused_gpl[];
272 #ifndef CONFIG_MODVERSIONS
273 #define symversion(base, idx) NULL
275 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
278 static bool each_symbol_in_section(const struct symsearch *arr,
279 unsigned int arrsize,
280 struct module *owner,
281 bool (*fn)(const struct symsearch *syms,
282 struct module *owner,
288 for (j = 0; j < arrsize; j++) {
289 if (fn(&arr[j], owner, data))
296 /* Returns true as soon as fn returns true, otherwise false. */
297 bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
298 struct module *owner,
303 static const struct symsearch arr[] = {
304 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
305 NOT_GPL_ONLY, false },
306 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
307 __start___kcrctab_gpl,
309 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
310 __start___kcrctab_gpl_future,
311 WILL_BE_GPL_ONLY, false },
312 #ifdef CONFIG_UNUSED_SYMBOLS
313 { __start___ksymtab_unused, __stop___ksymtab_unused,
314 __start___kcrctab_unused,
315 NOT_GPL_ONLY, true },
316 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
317 __start___kcrctab_unused_gpl,
322 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
325 list_for_each_entry_rcu(mod, &modules, list) {
326 struct symsearch arr[] = {
327 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
328 NOT_GPL_ONLY, false },
329 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
332 { mod->gpl_future_syms,
333 mod->gpl_future_syms + mod->num_gpl_future_syms,
334 mod->gpl_future_crcs,
335 WILL_BE_GPL_ONLY, false },
336 #ifdef CONFIG_UNUSED_SYMBOLS
338 mod->unused_syms + mod->num_unused_syms,
340 NOT_GPL_ONLY, true },
341 { mod->unused_gpl_syms,
342 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
343 mod->unused_gpl_crcs,
348 if (mod->state == MODULE_STATE_UNFORMED)
351 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
356 EXPORT_SYMBOL_GPL(each_symbol_section);
358 struct find_symbol_arg {
365 struct module *owner;
366 const unsigned long *crc;
367 const struct kernel_symbol *sym;
370 static bool check_symbol(const struct symsearch *syms,
371 struct module *owner,
372 unsigned int symnum, void *data)
374 struct find_symbol_arg *fsa = data;
377 if (syms->licence == GPL_ONLY)
379 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
380 printk(KERN_WARNING "Symbol %s is being used "
381 "by a non-GPL module, which will not "
382 "be allowed in the future\n", fsa->name);
386 #ifdef CONFIG_UNUSED_SYMBOLS
387 if (syms->unused && fsa->warn) {
388 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
389 "however this module is using it.\n", fsa->name);
391 "This symbol will go away in the future.\n");
393 "Please evalute if this is the right api to use and if "
394 "it really is, submit a report the linux kernel "
395 "mailinglist together with submitting your code for "
401 fsa->crc = symversion(syms->crcs, symnum);
402 fsa->sym = &syms->start[symnum];
406 static int cmp_name(const void *va, const void *vb)
409 const struct kernel_symbol *b;
411 return strcmp(a, b->name);
414 static bool find_symbol_in_section(const struct symsearch *syms,
415 struct module *owner,
418 struct find_symbol_arg *fsa = data;
419 struct kernel_symbol *sym;
421 sym = bsearch(fsa->name, syms->start, syms->stop - syms->start,
422 sizeof(struct kernel_symbol), cmp_name);
424 if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data))
430 /* Find a symbol and return it, along with, (optional) crc and
431 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
432 const struct kernel_symbol *find_symbol(const char *name,
433 struct module **owner,
434 const unsigned long **crc,
438 struct find_symbol_arg fsa;
444 if (each_symbol_section(find_symbol_in_section, &fsa)) {
452 pr_debug("Failed to find symbol %s\n", name);
455 EXPORT_SYMBOL_GPL(find_symbol);
457 /* Search for module by name: must hold module_mutex. */
458 static struct module *find_module_all(const char *name,
463 list_for_each_entry(mod, &modules, list) {
464 if (!even_unformed && mod->state == MODULE_STATE_UNFORMED)
466 if (strcmp(mod->name, name) == 0)
472 struct module *find_module(const char *name)
474 return find_module_all(name, false);
476 EXPORT_SYMBOL_GPL(find_module);
480 static inline void __percpu *mod_percpu(struct module *mod)
485 static int percpu_modalloc(struct module *mod,
486 unsigned long size, unsigned long align)
488 if (align > PAGE_SIZE) {
489 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
490 mod->name, align, PAGE_SIZE);
494 mod->percpu = __alloc_reserved_percpu(size, align);
497 "%s: Could not allocate %lu bytes percpu data\n",
501 mod->percpu_size = size;
505 static void percpu_modfree(struct module *mod)
507 free_percpu(mod->percpu);
510 static unsigned int find_pcpusec(struct load_info *info)
512 return find_sec(info, ".data..percpu");
515 static void percpu_modcopy(struct module *mod,
516 const void *from, unsigned long size)
520 for_each_possible_cpu(cpu)
521 memcpy(per_cpu_ptr(mod->percpu, cpu), from, size);
525 * is_module_percpu_address - test whether address is from module static percpu
526 * @addr: address to test
528 * Test whether @addr belongs to module static percpu area.
531 * %true if @addr is from module static percpu area
533 bool is_module_percpu_address(unsigned long addr)
540 list_for_each_entry_rcu(mod, &modules, list) {
541 if (mod->state == MODULE_STATE_UNFORMED)
543 if (!mod->percpu_size)
545 for_each_possible_cpu(cpu) {
546 void *start = per_cpu_ptr(mod->percpu, cpu);
548 if ((void *)addr >= start &&
549 (void *)addr < start + mod->percpu_size) {
560 #else /* ... !CONFIG_SMP */
562 static inline void __percpu *mod_percpu(struct module *mod)
566 static inline int percpu_modalloc(struct module *mod,
567 unsigned long size, unsigned long align)
571 static inline void percpu_modfree(struct module *mod)
574 static unsigned int find_pcpusec(struct load_info *info)
578 static inline void percpu_modcopy(struct module *mod,
579 const void *from, unsigned long size)
581 /* pcpusec should be 0, and size of that section should be 0. */
584 bool is_module_percpu_address(unsigned long addr)
589 #endif /* CONFIG_SMP */
591 #define MODINFO_ATTR(field) \
592 static void setup_modinfo_##field(struct module *mod, const char *s) \
594 mod->field = kstrdup(s, GFP_KERNEL); \
596 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
597 struct module_kobject *mk, char *buffer) \
599 return sprintf(buffer, "%s\n", mk->mod->field); \
601 static int modinfo_##field##_exists(struct module *mod) \
603 return mod->field != NULL; \
605 static void free_modinfo_##field(struct module *mod) \
610 static struct module_attribute modinfo_##field = { \
611 .attr = { .name = __stringify(field), .mode = 0444 }, \
612 .show = show_modinfo_##field, \
613 .setup = setup_modinfo_##field, \
614 .test = modinfo_##field##_exists, \
615 .free = free_modinfo_##field, \
618 MODINFO_ATTR(version);
619 MODINFO_ATTR(srcversion);
621 static char last_unloaded_module[MODULE_NAME_LEN+1];
623 #ifdef CONFIG_MODULE_UNLOAD
625 EXPORT_TRACEPOINT_SYMBOL(module_get);
627 /* Init the unload section of the module. */
628 static int module_unload_init(struct module *mod)
630 mod->refptr = alloc_percpu(struct module_ref);
634 INIT_LIST_HEAD(&mod->source_list);
635 INIT_LIST_HEAD(&mod->target_list);
637 /* Hold reference count during initialization. */
638 __this_cpu_write(mod->refptr->incs, 1);
639 /* Backwards compatibility macros put refcount during init. */
640 mod->waiter = current;
645 /* Does a already use b? */
646 static int already_uses(struct module *a, struct module *b)
648 struct module_use *use;
650 list_for_each_entry(use, &b->source_list, source_list) {
651 if (use->source == a) {
652 pr_debug("%s uses %s!\n", a->name, b->name);
656 pr_debug("%s does not use %s!\n", a->name, b->name);
662 * - we add 'a' as a "source", 'b' as a "target" of module use
663 * - the module_use is added to the list of 'b' sources (so
664 * 'b' can walk the list to see who sourced them), and of 'a'
665 * targets (so 'a' can see what modules it targets).
667 static int add_module_usage(struct module *a, struct module *b)
669 struct module_use *use;
671 pr_debug("Allocating new usage for %s.\n", a->name);
672 use = kmalloc(sizeof(*use), GFP_ATOMIC);
674 printk(KERN_WARNING "%s: out of memory loading\n", a->name);
680 list_add(&use->source_list, &b->source_list);
681 list_add(&use->target_list, &a->target_list);
685 /* Module a uses b: caller needs module_mutex() */
686 int ref_module(struct module *a, struct module *b)
690 if (b == NULL || already_uses(a, b))
693 /* If module isn't available, we fail. */
694 err = strong_try_module_get(b);
698 err = add_module_usage(a, b);
705 EXPORT_SYMBOL_GPL(ref_module);
707 /* Clear the unload stuff of the module. */
708 static void module_unload_free(struct module *mod)
710 struct module_use *use, *tmp;
712 mutex_lock(&module_mutex);
713 list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) {
714 struct module *i = use->target;
715 pr_debug("%s unusing %s\n", mod->name, i->name);
717 list_del(&use->source_list);
718 list_del(&use->target_list);
721 mutex_unlock(&module_mutex);
723 free_percpu(mod->refptr);
726 #ifdef CONFIG_MODULE_FORCE_UNLOAD
727 static inline int try_force_unload(unsigned int flags)
729 int ret = (flags & O_TRUNC);
731 add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE);
735 static inline int try_force_unload(unsigned int flags)
739 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
748 /* Whole machine is stopped with interrupts off when this runs. */
749 static int __try_stop_module(void *_sref)
751 struct stopref *sref = _sref;
753 /* If it's not unused, quit unless we're forcing. */
754 if (module_refcount(sref->mod) != 0) {
755 if (!(*sref->forced = try_force_unload(sref->flags)))
759 /* Mark it as dying. */
760 sref->mod->state = MODULE_STATE_GOING;
764 static int try_stop_module(struct module *mod, int flags, int *forced)
766 if (flags & O_NONBLOCK) {
767 struct stopref sref = { mod, flags, forced };
769 return stop_machine(__try_stop_module, &sref, NULL);
771 /* We don't need to stop the machine for this. */
772 mod->state = MODULE_STATE_GOING;
778 unsigned long module_refcount(struct module *mod)
780 unsigned long incs = 0, decs = 0;
783 for_each_possible_cpu(cpu)
784 decs += per_cpu_ptr(mod->refptr, cpu)->decs;
786 * ensure the incs are added up after the decs.
787 * module_put ensures incs are visible before decs with smp_wmb.
789 * This 2-count scheme avoids the situation where the refcount
790 * for CPU0 is read, then CPU0 increments the module refcount,
791 * then CPU1 drops that refcount, then the refcount for CPU1 is
792 * read. We would record a decrement but not its corresponding
793 * increment so we would see a low count (disaster).
795 * Rare situation? But module_refcount can be preempted, and we
796 * might be tallying up 4096+ CPUs. So it is not impossible.
799 for_each_possible_cpu(cpu)
800 incs += per_cpu_ptr(mod->refptr, cpu)->incs;
803 EXPORT_SYMBOL(module_refcount);
805 /* This exists whether we can unload or not */
806 static void free_module(struct module *mod);
808 static void wait_for_zero_refcount(struct module *mod)
810 /* Since we might sleep for some time, release the mutex first */
811 mutex_unlock(&module_mutex);
813 pr_debug("Looking at refcount...\n");
814 set_current_state(TASK_UNINTERRUPTIBLE);
815 if (module_refcount(mod) == 0)
819 current->state = TASK_RUNNING;
820 mutex_lock(&module_mutex);
823 SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
827 char name[MODULE_NAME_LEN];
830 if (!capable(CAP_SYS_MODULE) || modules_disabled)
833 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
835 name[MODULE_NAME_LEN-1] = '\0';
837 if (mutex_lock_interruptible(&module_mutex) != 0)
840 mod = find_module(name);
846 if (!list_empty(&mod->source_list)) {
847 /* Other modules depend on us: get rid of them first. */
852 /* Doing init or already dying? */
853 if (mod->state != MODULE_STATE_LIVE) {
854 /* FIXME: if (force), slam module count and wake up
856 pr_debug("%s already dying\n", mod->name);
861 /* If it has an init func, it must have an exit func to unload */
862 if (mod->init && !mod->exit) {
863 forced = try_force_unload(flags);
865 /* This module can't be removed */
871 /* Set this up before setting mod->state */
872 mod->waiter = current;
874 /* Stop the machine so refcounts can't move and disable module. */
875 ret = try_stop_module(mod, flags, &forced);
879 /* Never wait if forced. */
880 if (!forced && module_refcount(mod) != 0)
881 wait_for_zero_refcount(mod);
883 mutex_unlock(&module_mutex);
884 /* Final destruction now no one is using it. */
885 if (mod->exit != NULL)
887 blocking_notifier_call_chain(&module_notify_list,
888 MODULE_STATE_GOING, mod);
889 async_synchronize_full();
891 /* Store the name of the last unloaded module for diagnostic purposes */
892 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
897 mutex_unlock(&module_mutex);
901 static inline void print_unload_info(struct seq_file *m, struct module *mod)
903 struct module_use *use;
904 int printed_something = 0;
906 seq_printf(m, " %lu ", module_refcount(mod));
908 /* Always include a trailing , so userspace can differentiate
909 between this and the old multi-field proc format. */
910 list_for_each_entry(use, &mod->source_list, source_list) {
911 printed_something = 1;
912 seq_printf(m, "%s,", use->source->name);
915 if (mod->init != NULL && mod->exit == NULL) {
916 printed_something = 1;
917 seq_printf(m, "[permanent],");
920 if (!printed_something)
924 void __symbol_put(const char *symbol)
926 struct module *owner;
929 if (!find_symbol(symbol, &owner, NULL, true, false))
934 EXPORT_SYMBOL(__symbol_put);
936 /* Note this assumes addr is a function, which it currently always is. */
937 void symbol_put_addr(void *addr)
939 struct module *modaddr;
940 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
942 if (core_kernel_text(a))
945 /* module_text_address is safe here: we're supposed to have reference
946 * to module from symbol_get, so it can't go away. */
947 modaddr = __module_text_address(a);
951 EXPORT_SYMBOL_GPL(symbol_put_addr);
953 static ssize_t show_refcnt(struct module_attribute *mattr,
954 struct module_kobject *mk, char *buffer)
956 return sprintf(buffer, "%lu\n", module_refcount(mk->mod));
959 static struct module_attribute modinfo_refcnt =
960 __ATTR(refcnt, 0444, show_refcnt, NULL);
962 void __module_get(struct module *module)
966 __this_cpu_inc(module->refptr->incs);
967 trace_module_get(module, _RET_IP_);
971 EXPORT_SYMBOL(__module_get);
973 bool try_module_get(struct module *module)
980 if (likely(module_is_live(module))) {
981 __this_cpu_inc(module->refptr->incs);
982 trace_module_get(module, _RET_IP_);
990 EXPORT_SYMBOL(try_module_get);
992 void module_put(struct module *module)
996 smp_wmb(); /* see comment in module_refcount */
997 __this_cpu_inc(module->refptr->decs);
999 trace_module_put(module, _RET_IP_);
1000 /* Maybe they're waiting for us to drop reference? */
1001 if (unlikely(!module_is_live(module)))
1002 wake_up_process(module->waiter);
1006 EXPORT_SYMBOL(module_put);
1008 #else /* !CONFIG_MODULE_UNLOAD */
1009 static inline void print_unload_info(struct seq_file *m, struct module *mod)
1011 /* We don't know the usage count, or what modules are using. */
1012 seq_printf(m, " - -");
1015 static inline void module_unload_free(struct module *mod)
1019 int ref_module(struct module *a, struct module *b)
1021 return strong_try_module_get(b);
1023 EXPORT_SYMBOL_GPL(ref_module);
1025 static inline int module_unload_init(struct module *mod)
1029 #endif /* CONFIG_MODULE_UNLOAD */
1031 static size_t module_flags_taint(struct module *mod, char *buf)
1035 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
1037 if (mod->taints & (1 << TAINT_OOT_MODULE))
1039 if (mod->taints & (1 << TAINT_FORCED_MODULE))
1041 if (mod->taints & (1 << TAINT_CRAP))
1044 * TAINT_FORCED_RMMOD: could be added.
1045 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
1051 static ssize_t show_initstate(struct module_attribute *mattr,
1052 struct module_kobject *mk, char *buffer)
1054 const char *state = "unknown";
1056 switch (mk->mod->state) {
1057 case MODULE_STATE_LIVE:
1060 case MODULE_STATE_COMING:
1063 case MODULE_STATE_GOING:
1069 return sprintf(buffer, "%s\n", state);
1072 static struct module_attribute modinfo_initstate =
1073 __ATTR(initstate, 0444, show_initstate, NULL);
1075 static ssize_t store_uevent(struct module_attribute *mattr,
1076 struct module_kobject *mk,
1077 const char *buffer, size_t count)
1079 enum kobject_action action;
1081 if (kobject_action_type(buffer, count, &action) == 0)
1082 kobject_uevent(&mk->kobj, action);
1086 struct module_attribute module_uevent =
1087 __ATTR(uevent, 0200, NULL, store_uevent);
1089 static ssize_t show_coresize(struct module_attribute *mattr,
1090 struct module_kobject *mk, char *buffer)
1092 return sprintf(buffer, "%u\n", mk->mod->core_size);
1095 static struct module_attribute modinfo_coresize =
1096 __ATTR(coresize, 0444, show_coresize, NULL);
1098 static ssize_t show_initsize(struct module_attribute *mattr,
1099 struct module_kobject *mk, char *buffer)
1101 return sprintf(buffer, "%u\n", mk->mod->init_size);
1104 static struct module_attribute modinfo_initsize =
1105 __ATTR(initsize, 0444, show_initsize, NULL);
1107 static ssize_t show_taint(struct module_attribute *mattr,
1108 struct module_kobject *mk, char *buffer)
1112 l = module_flags_taint(mk->mod, buffer);
1117 static struct module_attribute modinfo_taint =
1118 __ATTR(taint, 0444, show_taint, NULL);
1120 static struct module_attribute *modinfo_attrs[] = {
1123 &modinfo_srcversion,
1128 #ifdef CONFIG_MODULE_UNLOAD
1134 static const char vermagic[] = VERMAGIC_STRING;
1136 static int try_to_force_load(struct module *mod, const char *reason)
1138 #ifdef CONFIG_MODULE_FORCE_LOAD
1139 if (!test_taint(TAINT_FORCED_MODULE))
1140 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
1142 add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE);
1149 #ifdef CONFIG_MODVERSIONS
1150 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1151 static unsigned long maybe_relocated(unsigned long crc,
1152 const struct module *crc_owner)
1154 #ifdef ARCH_RELOCATES_KCRCTAB
1155 if (crc_owner == NULL)
1156 return crc - (unsigned long)reloc_start;
1161 static int check_version(Elf_Shdr *sechdrs,
1162 unsigned int versindex,
1163 const char *symname,
1165 const unsigned long *crc,
1166 const struct module *crc_owner)
1168 unsigned int i, num_versions;
1169 struct modversion_info *versions;
1171 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1175 /* No versions at all? modprobe --force does this. */
1177 return try_to_force_load(mod, symname) == 0;
1179 versions = (void *) sechdrs[versindex].sh_addr;
1180 num_versions = sechdrs[versindex].sh_size
1181 / sizeof(struct modversion_info);
1183 for (i = 0; i < num_versions; i++) {
1184 if (strcmp(versions[i].name, symname) != 0)
1187 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
1189 pr_debug("Found checksum %lX vs module %lX\n",
1190 maybe_relocated(*crc, crc_owner), versions[i].crc);
1194 printk(KERN_WARNING "%s: no symbol version for %s\n",
1195 mod->name, symname);
1199 printk("%s: disagrees about version of symbol %s\n",
1200 mod->name, symname);
1204 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1205 unsigned int versindex,
1208 const unsigned long *crc;
1210 /* Since this should be found in kernel (which can't be removed),
1211 * no locking is necessary. */
1212 if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL,
1215 return check_version(sechdrs, versindex,
1216 VMLINUX_SYMBOL_STR(module_layout), mod, crc,
1220 /* First part is kernel version, which we ignore if module has crcs. */
1221 static inline int same_magic(const char *amagic, const char *bmagic,
1225 amagic += strcspn(amagic, " ");
1226 bmagic += strcspn(bmagic, " ");
1228 return strcmp(amagic, bmagic) == 0;
1231 static inline int check_version(Elf_Shdr *sechdrs,
1232 unsigned int versindex,
1233 const char *symname,
1235 const unsigned long *crc,
1236 const struct module *crc_owner)
1241 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1242 unsigned int versindex,
1248 static inline int same_magic(const char *amagic, const char *bmagic,
1251 return strcmp(amagic, bmagic) == 0;
1253 #endif /* CONFIG_MODVERSIONS */
1255 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1256 static const struct kernel_symbol *resolve_symbol(struct module *mod,
1257 const struct load_info *info,
1261 struct module *owner;
1262 const struct kernel_symbol *sym;
1263 const unsigned long *crc;
1266 mutex_lock(&module_mutex);
1267 sym = find_symbol(name, &owner, &crc,
1268 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
1272 if (!check_version(info->sechdrs, info->index.vers, name, mod, crc,
1274 sym = ERR_PTR(-EINVAL);
1278 err = ref_module(mod, owner);
1285 /* We must make copy under the lock if we failed to get ref. */
1286 strncpy(ownername, module_name(owner), MODULE_NAME_LEN);
1288 mutex_unlock(&module_mutex);
1292 static const struct kernel_symbol *
1293 resolve_symbol_wait(struct module *mod,
1294 const struct load_info *info,
1297 const struct kernel_symbol *ksym;
1298 char owner[MODULE_NAME_LEN];
1300 if (wait_event_interruptible_timeout(module_wq,
1301 !IS_ERR(ksym = resolve_symbol(mod, info, name, owner))
1302 || PTR_ERR(ksym) != -EBUSY,
1304 printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n",
1311 * /sys/module/foo/sections stuff
1312 * J. Corbet <corbet@lwn.net>
1316 #ifdef CONFIG_KALLSYMS
1317 static inline bool sect_empty(const Elf_Shdr *sect)
1319 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1322 struct module_sect_attr
1324 struct module_attribute mattr;
1326 unsigned long address;
1329 struct module_sect_attrs
1331 struct attribute_group grp;
1332 unsigned int nsections;
1333 struct module_sect_attr attrs[0];
1336 static ssize_t module_sect_show(struct module_attribute *mattr,
1337 struct module_kobject *mk, char *buf)
1339 struct module_sect_attr *sattr =
1340 container_of(mattr, struct module_sect_attr, mattr);
1341 return sprintf(buf, "0x%pK\n", (void *)sattr->address);
1344 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1346 unsigned int section;
1348 for (section = 0; section < sect_attrs->nsections; section++)
1349 kfree(sect_attrs->attrs[section].name);
1353 static void add_sect_attrs(struct module *mod, const struct load_info *info)
1355 unsigned int nloaded = 0, i, size[2];
1356 struct module_sect_attrs *sect_attrs;
1357 struct module_sect_attr *sattr;
1358 struct attribute **gattr;
1360 /* Count loaded sections and allocate structures */
1361 for (i = 0; i < info->hdr->e_shnum; i++)
1362 if (!sect_empty(&info->sechdrs[i]))
1364 size[0] = ALIGN(sizeof(*sect_attrs)
1365 + nloaded * sizeof(sect_attrs->attrs[0]),
1366 sizeof(sect_attrs->grp.attrs[0]));
1367 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1368 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1369 if (sect_attrs == NULL)
1372 /* Setup section attributes. */
1373 sect_attrs->grp.name = "sections";
1374 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1376 sect_attrs->nsections = 0;
1377 sattr = §_attrs->attrs[0];
1378 gattr = §_attrs->grp.attrs[0];
1379 for (i = 0; i < info->hdr->e_shnum; i++) {
1380 Elf_Shdr *sec = &info->sechdrs[i];
1381 if (sect_empty(sec))
1383 sattr->address = sec->sh_addr;
1384 sattr->name = kstrdup(info->secstrings + sec->sh_name,
1386 if (sattr->name == NULL)
1388 sect_attrs->nsections++;
1389 sysfs_attr_init(&sattr->mattr.attr);
1390 sattr->mattr.show = module_sect_show;
1391 sattr->mattr.store = NULL;
1392 sattr->mattr.attr.name = sattr->name;
1393 sattr->mattr.attr.mode = S_IRUGO;
1394 *(gattr++) = &(sattr++)->mattr.attr;
1398 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1401 mod->sect_attrs = sect_attrs;
1404 free_sect_attrs(sect_attrs);
1407 static void remove_sect_attrs(struct module *mod)
1409 if (mod->sect_attrs) {
1410 sysfs_remove_group(&mod->mkobj.kobj,
1411 &mod->sect_attrs->grp);
1412 /* We are positive that no one is using any sect attrs
1413 * at this point. Deallocate immediately. */
1414 free_sect_attrs(mod->sect_attrs);
1415 mod->sect_attrs = NULL;
1420 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1423 struct module_notes_attrs {
1424 struct kobject *dir;
1426 struct bin_attribute attrs[0];
1429 static ssize_t module_notes_read(struct file *filp, struct kobject *kobj,
1430 struct bin_attribute *bin_attr,
1431 char *buf, loff_t pos, size_t count)
1434 * The caller checked the pos and count against our size.
1436 memcpy(buf, bin_attr->private + pos, count);
1440 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1443 if (notes_attrs->dir) {
1445 sysfs_remove_bin_file(notes_attrs->dir,
1446 ¬es_attrs->attrs[i]);
1447 kobject_put(notes_attrs->dir);
1452 static void add_notes_attrs(struct module *mod, const struct load_info *info)
1454 unsigned int notes, loaded, i;
1455 struct module_notes_attrs *notes_attrs;
1456 struct bin_attribute *nattr;
1458 /* failed to create section attributes, so can't create notes */
1459 if (!mod->sect_attrs)
1462 /* Count notes sections and allocate structures. */
1464 for (i = 0; i < info->hdr->e_shnum; i++)
1465 if (!sect_empty(&info->sechdrs[i]) &&
1466 (info->sechdrs[i].sh_type == SHT_NOTE))
1472 notes_attrs = kzalloc(sizeof(*notes_attrs)
1473 + notes * sizeof(notes_attrs->attrs[0]),
1475 if (notes_attrs == NULL)
1478 notes_attrs->notes = notes;
1479 nattr = ¬es_attrs->attrs[0];
1480 for (loaded = i = 0; i < info->hdr->e_shnum; ++i) {
1481 if (sect_empty(&info->sechdrs[i]))
1483 if (info->sechdrs[i].sh_type == SHT_NOTE) {
1484 sysfs_bin_attr_init(nattr);
1485 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1486 nattr->attr.mode = S_IRUGO;
1487 nattr->size = info->sechdrs[i].sh_size;
1488 nattr->private = (void *) info->sechdrs[i].sh_addr;
1489 nattr->read = module_notes_read;
1495 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1496 if (!notes_attrs->dir)
1499 for (i = 0; i < notes; ++i)
1500 if (sysfs_create_bin_file(notes_attrs->dir,
1501 ¬es_attrs->attrs[i]))
1504 mod->notes_attrs = notes_attrs;
1508 free_notes_attrs(notes_attrs, i);
1511 static void remove_notes_attrs(struct module *mod)
1513 if (mod->notes_attrs)
1514 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1519 static inline void add_sect_attrs(struct module *mod,
1520 const struct load_info *info)
1524 static inline void remove_sect_attrs(struct module *mod)
1528 static inline void add_notes_attrs(struct module *mod,
1529 const struct load_info *info)
1533 static inline void remove_notes_attrs(struct module *mod)
1536 #endif /* CONFIG_KALLSYMS */
1538 static void add_usage_links(struct module *mod)
1540 #ifdef CONFIG_MODULE_UNLOAD
1541 struct module_use *use;
1544 mutex_lock(&module_mutex);
1545 list_for_each_entry(use, &mod->target_list, target_list) {
1546 nowarn = sysfs_create_link(use->target->holders_dir,
1547 &mod->mkobj.kobj, mod->name);
1549 mutex_unlock(&module_mutex);
1553 static void del_usage_links(struct module *mod)
1555 #ifdef CONFIG_MODULE_UNLOAD
1556 struct module_use *use;
1558 mutex_lock(&module_mutex);
1559 list_for_each_entry(use, &mod->target_list, target_list)
1560 sysfs_remove_link(use->target->holders_dir, mod->name);
1561 mutex_unlock(&module_mutex);
1565 static int module_add_modinfo_attrs(struct module *mod)
1567 struct module_attribute *attr;
1568 struct module_attribute *temp_attr;
1572 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1573 (ARRAY_SIZE(modinfo_attrs) + 1)),
1575 if (!mod->modinfo_attrs)
1578 temp_attr = mod->modinfo_attrs;
1579 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1581 (attr->test && attr->test(mod))) {
1582 memcpy(temp_attr, attr, sizeof(*temp_attr));
1583 sysfs_attr_init(&temp_attr->attr);
1584 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1591 static void module_remove_modinfo_attrs(struct module *mod)
1593 struct module_attribute *attr;
1596 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1597 /* pick a field to test for end of list */
1598 if (!attr->attr.name)
1600 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1604 kfree(mod->modinfo_attrs);
1607 static int mod_sysfs_init(struct module *mod)
1610 struct kobject *kobj;
1612 if (!module_sysfs_initialized) {
1613 printk(KERN_ERR "%s: module sysfs not initialized\n",
1619 kobj = kset_find_obj(module_kset, mod->name);
1621 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1627 mod->mkobj.mod = mod;
1629 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1630 mod->mkobj.kobj.kset = module_kset;
1631 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1634 kobject_put(&mod->mkobj.kobj);
1636 /* delay uevent until full sysfs population */
1641 static int mod_sysfs_setup(struct module *mod,
1642 const struct load_info *info,
1643 struct kernel_param *kparam,
1644 unsigned int num_params)
1648 err = mod_sysfs_init(mod);
1652 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1653 if (!mod->holders_dir) {
1658 err = module_param_sysfs_setup(mod, kparam, num_params);
1660 goto out_unreg_holders;
1662 err = module_add_modinfo_attrs(mod);
1664 goto out_unreg_param;
1666 add_usage_links(mod);
1667 add_sect_attrs(mod, info);
1668 add_notes_attrs(mod, info);
1670 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1674 module_param_sysfs_remove(mod);
1676 kobject_put(mod->holders_dir);
1678 kobject_put(&mod->mkobj.kobj);
1683 static void mod_sysfs_fini(struct module *mod)
1685 remove_notes_attrs(mod);
1686 remove_sect_attrs(mod);
1687 kobject_put(&mod->mkobj.kobj);
1690 #else /* !CONFIG_SYSFS */
1692 static int mod_sysfs_setup(struct module *mod,
1693 const struct load_info *info,
1694 struct kernel_param *kparam,
1695 unsigned int num_params)
1700 static void mod_sysfs_fini(struct module *mod)
1704 static void module_remove_modinfo_attrs(struct module *mod)
1708 static void del_usage_links(struct module *mod)
1712 #endif /* CONFIG_SYSFS */
1714 static void mod_sysfs_teardown(struct module *mod)
1716 del_usage_links(mod);
1717 module_remove_modinfo_attrs(mod);
1718 module_param_sysfs_remove(mod);
1719 kobject_put(mod->mkobj.drivers_dir);
1720 kobject_put(mod->holders_dir);
1721 mod_sysfs_fini(mod);
1725 * unlink the module with the whole machine is stopped with interrupts off
1726 * - this defends against kallsyms not taking locks
1728 static int __unlink_module(void *_mod)
1730 struct module *mod = _mod;
1731 list_del(&mod->list);
1732 module_bug_cleanup(mod);
1736 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
1738 * LKM RO/NX protection: protect module's text/ro-data
1739 * from modification and any data from execution.
1741 void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages))
1743 unsigned long begin_pfn = PFN_DOWN((unsigned long)start);
1744 unsigned long end_pfn = PFN_DOWN((unsigned long)end);
1746 if (end_pfn > begin_pfn)
1747 set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn);
1750 static void set_section_ro_nx(void *base,
1751 unsigned long text_size,
1752 unsigned long ro_size,
1753 unsigned long total_size)
1755 /* begin and end PFNs of the current subsection */
1756 unsigned long begin_pfn;
1757 unsigned long end_pfn;
1760 * Set RO for module text and RO-data:
1761 * - Always protect first page.
1762 * - Do not protect last partial page.
1765 set_page_attributes(base, base + ro_size, set_memory_ro);
1768 * Set NX permissions for module data:
1769 * - Do not protect first partial page.
1770 * - Always protect last page.
1772 if (total_size > text_size) {
1773 begin_pfn = PFN_UP((unsigned long)base + text_size);
1774 end_pfn = PFN_UP((unsigned long)base + total_size);
1775 if (end_pfn > begin_pfn)
1776 set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn);
1780 static void unset_module_core_ro_nx(struct module *mod)
1782 set_page_attributes(mod->module_core + mod->core_text_size,
1783 mod->module_core + mod->core_size,
1785 set_page_attributes(mod->module_core,
1786 mod->module_core + mod->core_ro_size,
1790 static void unset_module_init_ro_nx(struct module *mod)
1792 set_page_attributes(mod->module_init + mod->init_text_size,
1793 mod->module_init + mod->init_size,
1795 set_page_attributes(mod->module_init,
1796 mod->module_init + mod->init_ro_size,
1800 /* Iterate through all modules and set each module's text as RW */
1801 void set_all_modules_text_rw(void)
1805 mutex_lock(&module_mutex);
1806 list_for_each_entry_rcu(mod, &modules, list) {
1807 if (mod->state == MODULE_STATE_UNFORMED)
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 /* Iterate through all modules and set each module's text as RO */
1824 void set_all_modules_text_ro(void)
1828 mutex_lock(&module_mutex);
1829 list_for_each_entry_rcu(mod, &modules, list) {
1830 if (mod->state == MODULE_STATE_UNFORMED)
1832 if ((mod->module_core) && (mod->core_text_size)) {
1833 set_page_attributes(mod->module_core,
1834 mod->module_core + mod->core_text_size,
1837 if ((mod->module_init) && (mod->init_text_size)) {
1838 set_page_attributes(mod->module_init,
1839 mod->module_init + mod->init_text_size,
1843 mutex_unlock(&module_mutex);
1846 static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { }
1847 static void unset_module_core_ro_nx(struct module *mod) { }
1848 static void unset_module_init_ro_nx(struct module *mod) { }
1851 void __weak module_free(struct module *mod, void *module_region)
1853 vfree(module_region);
1856 void __weak module_arch_cleanup(struct module *mod)
1860 /* Free a module, remove from lists, etc. */
1861 static void free_module(struct module *mod)
1863 trace_module_free(mod);
1865 /* Delete from various lists */
1866 mutex_lock(&module_mutex);
1867 stop_machine(__unlink_module, mod, NULL);
1868 mutex_unlock(&module_mutex);
1869 mod_sysfs_teardown(mod);
1871 /* Remove dynamic debug info */
1872 ddebug_remove_module(mod->name);
1874 /* Arch-specific cleanup. */
1875 module_arch_cleanup(mod);
1877 /* Module unload stuff */
1878 module_unload_free(mod);
1880 /* Free any allocated parameters. */
1881 destroy_params(mod->kp, mod->num_kp);
1883 /* This may be NULL, but that's OK */
1884 unset_module_init_ro_nx(mod);
1885 module_free(mod, mod->module_init);
1887 percpu_modfree(mod);
1889 /* Free lock-classes: */
1890 lockdep_free_key_range(mod->module_core, mod->core_size);
1892 /* Finally, free the core (containing the module structure) */
1893 unset_module_core_ro_nx(mod);
1894 module_free(mod, mod->module_core);
1897 update_protections(current->mm);
1901 void *__symbol_get(const char *symbol)
1903 struct module *owner;
1904 const struct kernel_symbol *sym;
1907 sym = find_symbol(symbol, &owner, NULL, true, true);
1908 if (sym && strong_try_module_get(owner))
1912 return sym ? (void *)sym->value : NULL;
1914 EXPORT_SYMBOL_GPL(__symbol_get);
1917 * Ensure that an exported symbol [global namespace] does not already exist
1918 * in the kernel or in some other module's exported symbol table.
1920 * You must hold the module_mutex.
1922 static int verify_export_symbols(struct module *mod)
1925 struct module *owner;
1926 const struct kernel_symbol *s;
1928 const struct kernel_symbol *sym;
1931 { mod->syms, mod->num_syms },
1932 { mod->gpl_syms, mod->num_gpl_syms },
1933 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1934 #ifdef CONFIG_UNUSED_SYMBOLS
1935 { mod->unused_syms, mod->num_unused_syms },
1936 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1940 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1941 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1942 if (find_symbol(s->name, &owner, NULL, true, false)) {
1944 "%s: exports duplicate symbol %s"
1946 mod->name, s->name, module_name(owner));
1954 /* Change all symbols so that st_value encodes the pointer directly. */
1955 static int simplify_symbols(struct module *mod, const struct load_info *info)
1957 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
1958 Elf_Sym *sym = (void *)symsec->sh_addr;
1959 unsigned long secbase;
1962 const struct kernel_symbol *ksym;
1964 for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) {
1965 const char *name = info->strtab + sym[i].st_name;
1967 switch (sym[i].st_shndx) {
1969 /* We compiled with -fno-common. These are not
1970 supposed to happen. */
1971 pr_debug("Common symbol: %s\n", name);
1972 printk("%s: please compile with -fno-common\n",
1978 /* Don't need to do anything */
1979 pr_debug("Absolute symbol: 0x%08lx\n",
1980 (long)sym[i].st_value);
1984 ksym = resolve_symbol_wait(mod, info, name);
1985 /* Ok if resolved. */
1986 if (ksym && !IS_ERR(ksym)) {
1987 sym[i].st_value = ksym->value;
1992 if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1995 printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n",
1996 mod->name, name, PTR_ERR(ksym));
1997 ret = PTR_ERR(ksym) ?: -ENOENT;
2001 /* Divert to percpu allocation if a percpu var. */
2002 if (sym[i].st_shndx == info->index.pcpu)
2003 secbase = (unsigned long)mod_percpu(mod);
2005 secbase = info->sechdrs[sym[i].st_shndx].sh_addr;
2006 sym[i].st_value += secbase;
2014 static int apply_relocations(struct module *mod, const struct load_info *info)
2019 /* Now do relocations. */
2020 for (i = 1; i < info->hdr->e_shnum; i++) {
2021 unsigned int infosec = info->sechdrs[i].sh_info;
2023 /* Not a valid relocation section? */
2024 if (infosec >= info->hdr->e_shnum)
2027 /* Don't bother with non-allocated sections */
2028 if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC))
2031 if (info->sechdrs[i].sh_type == SHT_REL)
2032 err = apply_relocate(info->sechdrs, info->strtab,
2033 info->index.sym, i, mod);
2034 else if (info->sechdrs[i].sh_type == SHT_RELA)
2035 err = apply_relocate_add(info->sechdrs, info->strtab,
2036 info->index.sym, i, mod);
2043 /* Additional bytes needed by arch in front of individual sections */
2044 unsigned int __weak arch_mod_section_prepend(struct module *mod,
2045 unsigned int section)
2047 /* default implementation just returns zero */
2051 /* Update size with this section: return offset. */
2052 static long get_offset(struct module *mod, unsigned int *size,
2053 Elf_Shdr *sechdr, unsigned int section)
2057 *size += arch_mod_section_prepend(mod, section);
2058 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
2059 *size = ret + sechdr->sh_size;
2063 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
2064 might -- code, read-only data, read-write data, small data. Tally
2065 sizes, and place the offsets into sh_entsize fields: high bit means it
2067 static void layout_sections(struct module *mod, struct load_info *info)
2069 static unsigned long const masks[][2] = {
2070 /* NOTE: all executable code must be the first section
2071 * in this array; otherwise modify the text_size
2072 * finder in the two loops below */
2073 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
2074 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
2075 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
2076 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
2080 for (i = 0; i < info->hdr->e_shnum; i++)
2081 info->sechdrs[i].sh_entsize = ~0UL;
2083 pr_debug("Core section allocation order:\n");
2084 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
2085 for (i = 0; i < info->hdr->e_shnum; ++i) {
2086 Elf_Shdr *s = &info->sechdrs[i];
2087 const char *sname = info->secstrings + s->sh_name;
2089 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2090 || (s->sh_flags & masks[m][1])
2091 || s->sh_entsize != ~0UL
2092 || strstarts(sname, ".init"))
2094 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
2095 pr_debug("\t%s\n", sname);
2098 case 0: /* executable */
2099 mod->core_size = debug_align(mod->core_size);
2100 mod->core_text_size = mod->core_size;
2102 case 1: /* RO: text and ro-data */
2103 mod->core_size = debug_align(mod->core_size);
2104 mod->core_ro_size = mod->core_size;
2106 case 3: /* whole core */
2107 mod->core_size = debug_align(mod->core_size);
2112 pr_debug("Init section allocation order:\n");
2113 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
2114 for (i = 0; i < info->hdr->e_shnum; ++i) {
2115 Elf_Shdr *s = &info->sechdrs[i];
2116 const char *sname = info->secstrings + s->sh_name;
2118 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2119 || (s->sh_flags & masks[m][1])
2120 || s->sh_entsize != ~0UL
2121 || !strstarts(sname, ".init"))
2123 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
2124 | INIT_OFFSET_MASK);
2125 pr_debug("\t%s\n", sname);
2128 case 0: /* executable */
2129 mod->init_size = debug_align(mod->init_size);
2130 mod->init_text_size = mod->init_size;
2132 case 1: /* RO: text and ro-data */
2133 mod->init_size = debug_align(mod->init_size);
2134 mod->init_ro_size = mod->init_size;
2136 case 3: /* whole init */
2137 mod->init_size = debug_align(mod->init_size);
2143 static void set_license(struct module *mod, const char *license)
2146 license = "unspecified";
2148 if (!license_is_gpl_compatible(license)) {
2149 if (!test_taint(TAINT_PROPRIETARY_MODULE))
2150 printk(KERN_WARNING "%s: module license '%s' taints "
2151 "kernel.\n", mod->name, license);
2152 add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
2153 LOCKDEP_NOW_UNRELIABLE);
2157 /* Parse tag=value strings from .modinfo section */
2158 static char *next_string(char *string, unsigned long *secsize)
2160 /* Skip non-zero chars */
2163 if ((*secsize)-- <= 1)
2167 /* Skip any zero padding. */
2168 while (!string[0]) {
2170 if ((*secsize)-- <= 1)
2176 static char *get_modinfo(struct load_info *info, const char *tag)
2179 unsigned int taglen = strlen(tag);
2180 Elf_Shdr *infosec = &info->sechdrs[info->index.info];
2181 unsigned long size = infosec->sh_size;
2183 for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) {
2184 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
2185 return p + taglen + 1;
2190 static void setup_modinfo(struct module *mod, struct load_info *info)
2192 struct module_attribute *attr;
2195 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2197 attr->setup(mod, get_modinfo(info, attr->attr.name));
2201 static void free_modinfo(struct module *mod)
2203 struct module_attribute *attr;
2206 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2212 #ifdef CONFIG_KALLSYMS
2214 /* lookup symbol in given range of kernel_symbols */
2215 static const struct kernel_symbol *lookup_symbol(const char *name,
2216 const struct kernel_symbol *start,
2217 const struct kernel_symbol *stop)
2219 return bsearch(name, start, stop - start,
2220 sizeof(struct kernel_symbol), cmp_name);
2223 static int is_exported(const char *name, unsigned long value,
2224 const struct module *mod)
2226 const struct kernel_symbol *ks;
2228 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
2230 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
2231 return ks != NULL && ks->value == value;
2235 static char elf_type(const Elf_Sym *sym, const struct load_info *info)
2237 const Elf_Shdr *sechdrs = info->sechdrs;
2239 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
2240 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
2245 if (sym->st_shndx == SHN_UNDEF)
2247 if (sym->st_shndx == SHN_ABS)
2249 if (sym->st_shndx >= SHN_LORESERVE)
2251 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
2253 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
2254 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
2255 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
2257 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
2262 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
2263 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
2268 if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name,
2275 static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
2278 const Elf_Shdr *sec;
2280 if (src->st_shndx == SHN_UNDEF
2281 || src->st_shndx >= shnum
2285 sec = sechdrs + src->st_shndx;
2286 if (!(sec->sh_flags & SHF_ALLOC)
2287 #ifndef CONFIG_KALLSYMS_ALL
2288 || !(sec->sh_flags & SHF_EXECINSTR)
2290 || (sec->sh_entsize & INIT_OFFSET_MASK))
2297 * We only allocate and copy the strings needed by the parts of symtab
2298 * we keep. This is simple, but has the effect of making multiple
2299 * copies of duplicates. We could be more sophisticated, see
2300 * linux-kernel thread starting with
2301 * <73defb5e4bca04a6431392cc341112b1@localhost>.
2303 static void layout_symtab(struct module *mod, struct load_info *info)
2305 Elf_Shdr *symsect = info->sechdrs + info->index.sym;
2306 Elf_Shdr *strsect = info->sechdrs + info->index.str;
2308 unsigned int i, nsrc, ndst, strtab_size = 0;
2310 /* Put symbol section at end of init part of module. */
2311 symsect->sh_flags |= SHF_ALLOC;
2312 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
2313 info->index.sym) | INIT_OFFSET_MASK;
2314 pr_debug("\t%s\n", info->secstrings + symsect->sh_name);
2316 src = (void *)info->hdr + symsect->sh_offset;
2317 nsrc = symsect->sh_size / sizeof(*src);
2319 /* Compute total space required for the core symbols' strtab. */
2320 for (ndst = i = 0; i < nsrc; i++) {
2322 is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) {
2323 strtab_size += strlen(&info->strtab[src[i].st_name])+1;
2328 /* Append room for core symbols at end of core part. */
2329 info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
2330 info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym);
2331 mod->core_size += strtab_size;
2333 /* Put string table section at end of init part of module. */
2334 strsect->sh_flags |= SHF_ALLOC;
2335 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
2336 info->index.str) | INIT_OFFSET_MASK;
2337 pr_debug("\t%s\n", info->secstrings + strsect->sh_name);
2340 static void add_kallsyms(struct module *mod, const struct load_info *info)
2342 unsigned int i, ndst;
2346 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
2348 mod->symtab = (void *)symsec->sh_addr;
2349 mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym);
2350 /* Make sure we get permanent strtab: don't use info->strtab. */
2351 mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr;
2353 /* Set types up while we still have access to sections. */
2354 for (i = 0; i < mod->num_symtab; i++)
2355 mod->symtab[i].st_info = elf_type(&mod->symtab[i], info);
2357 mod->core_symtab = dst = mod->module_core + info->symoffs;
2358 mod->core_strtab = s = mod->module_core + info->stroffs;
2360 for (ndst = i = 0; i < mod->num_symtab; i++) {
2362 is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) {
2364 dst[ndst++].st_name = s - mod->core_strtab;
2365 s += strlcpy(s, &mod->strtab[src[i].st_name],
2369 mod->core_num_syms = ndst;
2372 static inline void layout_symtab(struct module *mod, struct load_info *info)
2376 static void add_kallsyms(struct module *mod, const struct load_info *info)
2379 #endif /* CONFIG_KALLSYMS */
2381 static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
2385 #ifdef CONFIG_DYNAMIC_DEBUG
2386 if (ddebug_add_module(debug, num, debug->modname))
2387 printk(KERN_ERR "dynamic debug error adding module: %s\n",
2392 static void dynamic_debug_remove(struct _ddebug *debug)
2395 ddebug_remove_module(debug->modname);
2398 void * __weak module_alloc(unsigned long size)
2400 return vmalloc_exec(size);
2403 static void *module_alloc_update_bounds(unsigned long size)
2405 void *ret = module_alloc(size);
2408 mutex_lock(&module_mutex);
2409 /* Update module bounds. */
2410 if ((unsigned long)ret < module_addr_min)
2411 module_addr_min = (unsigned long)ret;
2412 if ((unsigned long)ret + size > module_addr_max)
2413 module_addr_max = (unsigned long)ret + size;
2414 mutex_unlock(&module_mutex);
2419 #ifdef CONFIG_DEBUG_KMEMLEAK
2420 static void kmemleak_load_module(const struct module *mod,
2421 const struct load_info *info)
2425 /* only scan the sections containing data */
2426 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
2428 for (i = 1; i < info->hdr->e_shnum; i++) {
2429 const char *name = info->secstrings + info->sechdrs[i].sh_name;
2430 if (!(info->sechdrs[i].sh_flags & SHF_ALLOC))
2432 if (!strstarts(name, ".data") && !strstarts(name, ".bss"))
2435 kmemleak_scan_area((void *)info->sechdrs[i].sh_addr,
2436 info->sechdrs[i].sh_size, GFP_KERNEL);
2440 static inline void kmemleak_load_module(const struct module *mod,
2441 const struct load_info *info)
2446 #ifdef CONFIG_MODULE_SIG
2447 static int module_sig_check(struct load_info *info)
2450 const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1;
2451 const void *mod = info->hdr;
2453 if (info->len > markerlen &&
2454 memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) {
2455 /* We truncate the module to discard the signature */
2456 info->len -= markerlen;
2457 err = mod_verify_sig(mod, &info->len);
2461 info->sig_ok = true;
2465 /* Not having a signature is only an error if we're strict. */
2466 if (err < 0 && fips_enabled)
2467 panic("Module verification failed with error %d in FIPS mode\n",
2469 if (err == -ENOKEY && !sig_enforce)
2474 #else /* !CONFIG_MODULE_SIG */
2475 static int module_sig_check(struct load_info *info)
2479 #endif /* !CONFIG_MODULE_SIG */
2481 /* Sanity checks against invalid binaries, wrong arch, weird elf version. */
2482 static int elf_header_check(struct load_info *info)
2484 if (info->len < sizeof(*(info->hdr)))
2487 if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0
2488 || info->hdr->e_type != ET_REL
2489 || !elf_check_arch(info->hdr)
2490 || info->hdr->e_shentsize != sizeof(Elf_Shdr))
2493 if (info->hdr->e_shoff >= info->len
2494 || (info->hdr->e_shnum * sizeof(Elf_Shdr) >
2495 info->len - info->hdr->e_shoff))
2501 /* Sets info->hdr and info->len. */
2502 static int copy_module_from_user(const void __user *umod, unsigned long len,
2503 struct load_info *info)
2508 if (info->len < sizeof(*(info->hdr)))
2511 err = security_kernel_module_from_file(NULL);
2515 /* Suck in entire file: we'll want most of it. */
2516 info->hdr = vmalloc(info->len);
2520 if (copy_from_user(info->hdr, umod, info->len) != 0) {
2528 /* Sets info->hdr and info->len. */
2529 static int copy_module_from_fd(int fd, struct load_info *info)
2541 err = security_kernel_module_from_file(file);
2545 err = vfs_getattr(&file->f_path, &stat);
2549 if (stat.size > INT_MAX) {
2554 /* Don't hand 0 to vmalloc, it whines. */
2555 if (stat.size == 0) {
2560 info->hdr = vmalloc(stat.size);
2567 while (pos < stat.size) {
2568 bytes = kernel_read(file, pos, (char *)(info->hdr) + pos,
2586 static void free_copy(struct load_info *info)
2591 static int rewrite_section_headers(struct load_info *info, int flags)
2595 /* This should always be true, but let's be sure. */
2596 info->sechdrs[0].sh_addr = 0;
2598 for (i = 1; i < info->hdr->e_shnum; i++) {
2599 Elf_Shdr *shdr = &info->sechdrs[i];
2600 if (shdr->sh_type != SHT_NOBITS
2601 && info->len < shdr->sh_offset + shdr->sh_size) {
2602 printk(KERN_ERR "Module len %lu truncated\n",
2607 /* Mark all sections sh_addr with their address in the
2609 shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset;
2611 #ifndef CONFIG_MODULE_UNLOAD
2612 /* Don't load .exit sections */
2613 if (strstarts(info->secstrings+shdr->sh_name, ".exit"))
2614 shdr->sh_flags &= ~(unsigned long)SHF_ALLOC;
2618 /* Track but don't keep modinfo and version sections. */
2619 if (flags & MODULE_INIT_IGNORE_MODVERSIONS)
2620 info->index.vers = 0; /* Pretend no __versions section! */
2622 info->index.vers = find_sec(info, "__versions");
2623 info->index.info = find_sec(info, ".modinfo");
2624 info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC;
2625 info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC;
2630 * Set up our basic convenience variables (pointers to section headers,
2631 * search for module section index etc), and do some basic section
2634 * Return the temporary module pointer (we'll replace it with the final
2635 * one when we move the module sections around).
2637 static struct module *setup_load_info(struct load_info *info, int flags)
2643 /* Set up the convenience variables */
2644 info->sechdrs = (void *)info->hdr + info->hdr->e_shoff;
2645 info->secstrings = (void *)info->hdr
2646 + info->sechdrs[info->hdr->e_shstrndx].sh_offset;
2648 err = rewrite_section_headers(info, flags);
2650 return ERR_PTR(err);
2652 /* Find internal symbols and strings. */
2653 for (i = 1; i < info->hdr->e_shnum; i++) {
2654 if (info->sechdrs[i].sh_type == SHT_SYMTAB) {
2655 info->index.sym = i;
2656 info->index.str = info->sechdrs[i].sh_link;
2657 info->strtab = (char *)info->hdr
2658 + info->sechdrs[info->index.str].sh_offset;
2663 info->index.mod = find_sec(info, ".gnu.linkonce.this_module");
2664 if (!info->index.mod) {
2665 printk(KERN_WARNING "No module found in object\n");
2666 return ERR_PTR(-ENOEXEC);
2668 /* This is temporary: point mod into copy of data. */
2669 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
2671 if (info->index.sym == 0) {
2672 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2674 return ERR_PTR(-ENOEXEC);
2677 info->index.pcpu = find_pcpusec(info);
2679 /* Check module struct version now, before we try to use module. */
2680 if (!check_modstruct_version(info->sechdrs, info->index.vers, mod))
2681 return ERR_PTR(-ENOEXEC);
2686 static int check_modinfo(struct module *mod, struct load_info *info, int flags)
2688 const char *modmagic = get_modinfo(info, "vermagic");
2691 if (flags & MODULE_INIT_IGNORE_VERMAGIC)
2694 /* This is allowed: modprobe --force will invalidate it. */
2696 err = try_to_force_load(mod, "bad vermagic");
2699 } else if (!same_magic(modmagic, vermagic, info->index.vers)) {
2700 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2701 mod->name, modmagic, vermagic);
2705 if (!get_modinfo(info, "intree"))
2706 add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK);
2708 if (get_modinfo(info, "staging")) {
2709 add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK);
2710 printk(KERN_WARNING "%s: module is from the staging directory,"
2711 " the quality is unknown, you have been warned.\n",
2715 /* Set up license info based on the info section */
2716 set_license(mod, get_modinfo(info, "license"));
2721 static void find_module_sections(struct module *mod, struct load_info *info)
2723 mod->kp = section_objs(info, "__param",
2724 sizeof(*mod->kp), &mod->num_kp);
2725 mod->syms = section_objs(info, "__ksymtab",
2726 sizeof(*mod->syms), &mod->num_syms);
2727 mod->crcs = section_addr(info, "__kcrctab");
2728 mod->gpl_syms = section_objs(info, "__ksymtab_gpl",
2729 sizeof(*mod->gpl_syms),
2730 &mod->num_gpl_syms);
2731 mod->gpl_crcs = section_addr(info, "__kcrctab_gpl");
2732 mod->gpl_future_syms = section_objs(info,
2733 "__ksymtab_gpl_future",
2734 sizeof(*mod->gpl_future_syms),
2735 &mod->num_gpl_future_syms);
2736 mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future");
2738 #ifdef CONFIG_UNUSED_SYMBOLS
2739 mod->unused_syms = section_objs(info, "__ksymtab_unused",
2740 sizeof(*mod->unused_syms),
2741 &mod->num_unused_syms);
2742 mod->unused_crcs = section_addr(info, "__kcrctab_unused");
2743 mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl",
2744 sizeof(*mod->unused_gpl_syms),
2745 &mod->num_unused_gpl_syms);
2746 mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl");
2748 #ifdef CONFIG_CONSTRUCTORS
2749 mod->ctors = section_objs(info, ".ctors",
2750 sizeof(*mod->ctors), &mod->num_ctors);
2753 #ifdef CONFIG_TRACEPOINTS
2754 mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs",
2755 sizeof(*mod->tracepoints_ptrs),
2756 &mod->num_tracepoints);
2758 #ifdef HAVE_JUMP_LABEL
2759 mod->jump_entries = section_objs(info, "__jump_table",
2760 sizeof(*mod->jump_entries),
2761 &mod->num_jump_entries);
2763 #ifdef CONFIG_EVENT_TRACING
2764 mod->trace_events = section_objs(info, "_ftrace_events",
2765 sizeof(*mod->trace_events),
2766 &mod->num_trace_events);
2768 * This section contains pointers to allocated objects in the trace
2769 * code and not scanning it leads to false positives.
2771 kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
2772 mod->num_trace_events, GFP_KERNEL);
2774 #ifdef CONFIG_TRACING
2775 mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt",
2776 sizeof(*mod->trace_bprintk_fmt_start),
2777 &mod->num_trace_bprintk_fmt);
2779 * This section contains pointers to allocated objects in the trace
2780 * code and not scanning it leads to false positives.
2782 kmemleak_scan_area(mod->trace_bprintk_fmt_start,
2783 sizeof(*mod->trace_bprintk_fmt_start) *
2784 mod->num_trace_bprintk_fmt, GFP_KERNEL);
2786 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2787 /* sechdrs[0].sh_size is always zero */
2788 mod->ftrace_callsites = section_objs(info, "__mcount_loc",
2789 sizeof(*mod->ftrace_callsites),
2790 &mod->num_ftrace_callsites);
2793 mod->extable = section_objs(info, "__ex_table",
2794 sizeof(*mod->extable), &mod->num_exentries);
2796 if (section_addr(info, "__obsparm"))
2797 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2800 info->debug = section_objs(info, "__verbose",
2801 sizeof(*info->debug), &info->num_debug);
2804 static int move_module(struct module *mod, struct load_info *info)
2809 /* Do the allocs. */
2810 ptr = module_alloc_update_bounds(mod->core_size);
2812 * The pointer to this block is stored in the module structure
2813 * which is inside the block. Just mark it as not being a
2816 kmemleak_not_leak(ptr);
2820 memset(ptr, 0, mod->core_size);
2821 mod->module_core = ptr;
2823 if (mod->init_size) {
2824 ptr = module_alloc_update_bounds(mod->init_size);
2826 * The pointer to this block is stored in the module structure
2827 * which is inside the block. This block doesn't need to be
2828 * scanned as it contains data and code that will be freed
2829 * after the module is initialized.
2831 kmemleak_ignore(ptr);
2833 module_free(mod, mod->module_core);
2836 memset(ptr, 0, mod->init_size);
2837 mod->module_init = ptr;
2839 mod->module_init = NULL;
2841 /* Transfer each section which specifies SHF_ALLOC */
2842 pr_debug("final section addresses:\n");
2843 for (i = 0; i < info->hdr->e_shnum; i++) {
2845 Elf_Shdr *shdr = &info->sechdrs[i];
2847 if (!(shdr->sh_flags & SHF_ALLOC))
2850 if (shdr->sh_entsize & INIT_OFFSET_MASK)
2851 dest = mod->module_init
2852 + (shdr->sh_entsize & ~INIT_OFFSET_MASK);
2854 dest = mod->module_core + shdr->sh_entsize;
2856 if (shdr->sh_type != SHT_NOBITS)
2857 memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size);
2858 /* Update sh_addr to point to copy in image. */
2859 shdr->sh_addr = (unsigned long)dest;
2860 pr_debug("\t0x%lx %s\n",
2861 (long)shdr->sh_addr, info->secstrings + shdr->sh_name);
2867 static int check_module_license_and_versions(struct module *mod)
2870 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2871 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2872 * using GPL-only symbols it needs.
2874 if (strcmp(mod->name, "ndiswrapper") == 0)
2875 add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE);
2877 /* driverloader was caught wrongly pretending to be under GPL */
2878 if (strcmp(mod->name, "driverloader") == 0)
2879 add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
2880 LOCKDEP_NOW_UNRELIABLE);
2882 /* lve claims to be GPL but upstream won't provide source */
2883 if (strcmp(mod->name, "lve") == 0)
2884 add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
2885 LOCKDEP_NOW_UNRELIABLE);
2887 #ifdef CONFIG_MODVERSIONS
2888 if ((mod->num_syms && !mod->crcs)
2889 || (mod->num_gpl_syms && !mod->gpl_crcs)
2890 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2891 #ifdef CONFIG_UNUSED_SYMBOLS
2892 || (mod->num_unused_syms && !mod->unused_crcs)
2893 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2896 return try_to_force_load(mod,
2897 "no versions for exported symbols");
2903 static void flush_module_icache(const struct module *mod)
2905 mm_segment_t old_fs;
2907 /* flush the icache in correct context */
2912 * Flush the instruction cache, since we've played with text.
2913 * Do it before processing of module parameters, so the module
2914 * can provide parameter accessor functions of its own.
2916 if (mod->module_init)
2917 flush_icache_range((unsigned long)mod->module_init,
2918 (unsigned long)mod->module_init
2920 flush_icache_range((unsigned long)mod->module_core,
2921 (unsigned long)mod->module_core + mod->core_size);
2926 int __weak module_frob_arch_sections(Elf_Ehdr *hdr,
2934 static struct module *layout_and_allocate(struct load_info *info, int flags)
2936 /* Module within temporary copy. */
2941 mod = setup_load_info(info, flags);
2945 err = check_modinfo(mod, info, flags);
2947 return ERR_PTR(err);
2949 /* Allow arches to frob section contents and sizes. */
2950 err = module_frob_arch_sections(info->hdr, info->sechdrs,
2951 info->secstrings, mod);
2955 pcpusec = &info->sechdrs[info->index.pcpu];
2956 if (pcpusec->sh_size) {
2957 /* We have a special allocation for this section. */
2958 err = percpu_modalloc(mod,
2959 pcpusec->sh_size, pcpusec->sh_addralign);
2962 pcpusec->sh_flags &= ~(unsigned long)SHF_ALLOC;
2965 /* Determine total sizes, and put offsets in sh_entsize. For now
2966 this is done generically; there doesn't appear to be any
2967 special cases for the architectures. */
2968 layout_sections(mod, info);
2969 layout_symtab(mod, info);
2971 /* Allocate and move to the final place */
2972 err = move_module(mod, info);
2976 /* Module has been copied to its final place now: return it. */
2977 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
2978 kmemleak_load_module(mod, info);
2982 percpu_modfree(mod);
2984 return ERR_PTR(err);
2987 /* mod is no longer valid after this! */
2988 static void module_deallocate(struct module *mod, struct load_info *info)
2990 percpu_modfree(mod);
2991 module_free(mod, mod->module_init);
2992 module_free(mod, mod->module_core);
2995 int __weak module_finalize(const Elf_Ehdr *hdr,
2996 const Elf_Shdr *sechdrs,
3002 static int post_relocation(struct module *mod, const struct load_info *info)
3004 /* Sort exception table now relocations are done. */
3005 sort_extable(mod->extable, mod->extable + mod->num_exentries);
3007 /* Copy relocated percpu area over. */
3008 percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr,
3009 info->sechdrs[info->index.pcpu].sh_size);
3011 /* Setup kallsyms-specific fields. */
3012 add_kallsyms(mod, info);
3014 /* Arch-specific module finalizing. */
3015 return module_finalize(info->hdr, info->sechdrs, mod);
3018 /* Is this module of this name done loading? No locks held. */
3019 static bool finished_loading(const char *name)
3024 mutex_lock(&module_mutex);
3025 mod = find_module_all(name, true);
3026 ret = !mod || mod->state == MODULE_STATE_LIVE
3027 || mod->state == MODULE_STATE_GOING;
3028 mutex_unlock(&module_mutex);
3033 /* Call module constructors. */
3034 static void do_mod_ctors(struct module *mod)
3036 #ifdef CONFIG_CONSTRUCTORS
3039 for (i = 0; i < mod->num_ctors; i++)
3044 /* This is where the real work happens */
3045 static int do_init_module(struct module *mod)
3050 * We want to find out whether @mod uses async during init. Clear
3051 * PF_USED_ASYNC. async_schedule*() will set it.
3053 current->flags &= ~PF_USED_ASYNC;
3055 blocking_notifier_call_chain(&module_notify_list,
3056 MODULE_STATE_COMING, mod);
3058 /* Set RO and NX regions for core */
3059 set_section_ro_nx(mod->module_core,
3060 mod->core_text_size,
3064 /* Set RO and NX regions for init */
3065 set_section_ro_nx(mod->module_init,
3066 mod->init_text_size,
3071 /* Start the module */
3072 if (mod->init != NULL)
3073 ret = do_one_initcall(mod->init);
3075 /* Init routine failed: abort. Try to protect us from
3076 buggy refcounters. */
3077 mod->state = MODULE_STATE_GOING;
3078 synchronize_sched();
3080 blocking_notifier_call_chain(&module_notify_list,
3081 MODULE_STATE_GOING, mod);
3083 wake_up_all(&module_wq);
3088 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
3089 "%s: loading module anyway...\n",
3090 __func__, mod->name, ret,
3095 /* Now it's a first class citizen! */
3096 mod->state = MODULE_STATE_LIVE;
3097 blocking_notifier_call_chain(&module_notify_list,
3098 MODULE_STATE_LIVE, mod);
3101 * We need to finish all async code before the module init sequence
3102 * is done. This has potential to deadlock. For example, a newly
3103 * detected block device can trigger request_module() of the
3104 * default iosched from async probing task. Once userland helper
3105 * reaches here, async_synchronize_full() will wait on the async
3106 * task waiting on request_module() and deadlock.
3108 * This deadlock is avoided by perfomring async_synchronize_full()
3109 * iff module init queued any async jobs. This isn't a full
3110 * solution as it will deadlock the same if module loading from
3111 * async jobs nests more than once; however, due to the various
3112 * constraints, this hack seems to be the best option for now.
3113 * Please refer to the following thread for details.
3115 * http://thread.gmane.org/gmane.linux.kernel/1420814
3117 if (current->flags & PF_USED_ASYNC)
3118 async_synchronize_full();
3120 mutex_lock(&module_mutex);
3121 /* Drop initial reference. */
3123 trim_init_extable(mod);
3124 #ifdef CONFIG_KALLSYMS
3125 mod->num_symtab = mod->core_num_syms;
3126 mod->symtab = mod->core_symtab;
3127 mod->strtab = mod->core_strtab;
3129 unset_module_init_ro_nx(mod);
3130 module_free(mod, mod->module_init);
3131 mod->module_init = NULL;
3133 mod->init_ro_size = 0;
3134 mod->init_text_size = 0;
3135 mutex_unlock(&module_mutex);
3136 wake_up_all(&module_wq);
3141 static int may_init_module(void)
3143 if (!capable(CAP_SYS_MODULE) || modules_disabled)
3150 * We try to place it in the list now to make sure it's unique before
3151 * we dedicate too many resources. In particular, temporary percpu
3152 * memory exhaustion.
3154 static int add_unformed_module(struct module *mod)
3159 mod->state = MODULE_STATE_UNFORMED;
3162 mutex_lock(&module_mutex);
3163 if ((old = find_module_all(mod->name, true)) != NULL) {
3164 if (old->state == MODULE_STATE_COMING
3165 || old->state == MODULE_STATE_UNFORMED) {
3166 /* Wait in case it fails to load. */
3167 mutex_unlock(&module_mutex);
3168 err = wait_event_interruptible(module_wq,
3169 finished_loading(mod->name));
3177 list_add_rcu(&mod->list, &modules);
3181 mutex_unlock(&module_mutex);
3186 static int complete_formation(struct module *mod, struct load_info *info)
3190 mutex_lock(&module_mutex);
3192 /* Find duplicate symbols (must be called under lock). */
3193 err = verify_export_symbols(mod);
3197 /* This relies on module_mutex for list integrity. */
3198 module_bug_finalize(info->hdr, info->sechdrs, mod);
3200 /* Mark state as coming so strong_try_module_get() ignores us,
3201 * but kallsyms etc. can see us. */
3202 mod->state = MODULE_STATE_COMING;
3205 mutex_unlock(&module_mutex);
3209 /* Allocate and load the module: note that size of section 0 is always
3210 zero, and we rely on this for optional sections. */
3211 static int load_module(struct load_info *info, const char __user *uargs,
3217 err = module_sig_check(info);
3221 err = elf_header_check(info);
3225 /* Figure out module layout, and allocate all the memory. */
3226 mod = layout_and_allocate(info, flags);
3232 /* Reserve our place in the list. */
3233 err = add_unformed_module(mod);
3237 #ifdef CONFIG_MODULE_SIG
3238 mod->sig_ok = info->sig_ok;
3240 printk_once(KERN_NOTICE
3241 "%s: module verification failed: signature and/or"
3242 " required key missing - tainting kernel\n",
3244 add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_STILL_OK);
3248 /* Now module is in final location, initialize linked lists, etc. */
3249 err = module_unload_init(mod);
3253 /* Now we've got everything in the final locations, we can
3254 * find optional sections. */
3255 find_module_sections(mod, info);
3257 err = check_module_license_and_versions(mod);
3261 /* Set up MODINFO_ATTR fields */
3262 setup_modinfo(mod, info);
3264 /* Fix up syms, so that st_value is a pointer to location. */
3265 err = simplify_symbols(mod, info);
3269 err = apply_relocations(mod, info);
3273 err = post_relocation(mod, info);
3277 flush_module_icache(mod);
3279 /* Now copy in args */
3280 mod->args = strndup_user(uargs, ~0UL >> 1);
3281 if (IS_ERR(mod->args)) {
3282 err = PTR_ERR(mod->args);
3283 goto free_arch_cleanup;
3286 dynamic_debug_setup(info->debug, info->num_debug);
3288 /* Finally it's fully formed, ready to start executing. */
3289 err = complete_formation(mod, info);
3291 goto ddebug_cleanup;
3293 /* Module is ready to execute: parsing args may do that. */
3294 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp,
3295 -32768, 32767, &ddebug_dyndbg_module_param_cb);
3299 /* Link in to syfs. */
3300 err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp);
3304 /* Get rid of temporary copy. */
3308 trace_module_load(mod);
3310 return do_init_module(mod);
3313 /* module_bug_cleanup needs module_mutex protection */
3314 mutex_lock(&module_mutex);
3315 module_bug_cleanup(mod);
3316 mutex_unlock(&module_mutex);
3318 dynamic_debug_remove(info->debug);
3319 synchronize_sched();
3322 module_arch_cleanup(mod);
3326 module_unload_free(mod);
3328 mutex_lock(&module_mutex);
3329 /* Unlink carefully: kallsyms could be walking list. */
3330 list_del_rcu(&mod->list);
3331 wake_up_all(&module_wq);
3332 mutex_unlock(&module_mutex);
3334 module_deallocate(mod, info);
3340 SYSCALL_DEFINE3(init_module, void __user *, umod,
3341 unsigned long, len, const char __user *, uargs)
3344 struct load_info info = { };
3346 err = may_init_module();
3350 pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
3353 err = copy_module_from_user(umod, len, &info);
3357 return load_module(&info, uargs, 0);
3360 SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags)
3363 struct load_info info = { };
3365 err = may_init_module();
3369 pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags);
3371 if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS
3372 |MODULE_INIT_IGNORE_VERMAGIC))
3375 err = copy_module_from_fd(fd, &info);
3379 return load_module(&info, uargs, flags);
3382 static inline int within(unsigned long addr, void *start, unsigned long size)
3384 return ((void *)addr >= start && (void *)addr < start + size);
3387 #ifdef CONFIG_KALLSYMS
3389 * This ignores the intensely annoying "mapping symbols" found
3390 * in ARM ELF files: $a, $t and $d.
3392 static inline int is_arm_mapping_symbol(const char *str)
3394 return str[0] == '$' && strchr("atd", str[1])
3395 && (str[2] == '\0' || str[2] == '.');
3398 static const char *get_ksymbol(struct module *mod,
3400 unsigned long *size,
3401 unsigned long *offset)
3403 unsigned int i, best = 0;
3404 unsigned long nextval;
3406 /* At worse, next value is at end of module */
3407 if (within_module_init(addr, mod))
3408 nextval = (unsigned long)mod->module_init+mod->init_text_size;
3410 nextval = (unsigned long)mod->module_core+mod->core_text_size;
3412 /* Scan for closest preceding symbol, and next symbol. (ELF
3413 starts real symbols at 1). */
3414 for (i = 1; i < mod->num_symtab; i++) {
3415 if (mod->symtab[i].st_shndx == SHN_UNDEF)
3418 /* We ignore unnamed symbols: they're uninformative
3419 * and inserted at a whim. */
3420 if (mod->symtab[i].st_value <= addr
3421 && mod->symtab[i].st_value > mod->symtab[best].st_value
3422 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
3423 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
3425 if (mod->symtab[i].st_value > addr
3426 && mod->symtab[i].st_value < nextval
3427 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
3428 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
3429 nextval = mod->symtab[i].st_value;
3436 *size = nextval - mod->symtab[best].st_value;
3438 *offset = addr - mod->symtab[best].st_value;
3439 return mod->strtab + mod->symtab[best].st_name;
3442 /* For kallsyms to ask for address resolution. NULL means not found. Careful
3443 * not to lock to avoid deadlock on oopses, simply disable preemption. */
3444 const char *module_address_lookup(unsigned long addr,
3445 unsigned long *size,
3446 unsigned long *offset,
3451 const char *ret = NULL;
3454 list_for_each_entry_rcu(mod, &modules, list) {
3455 if (mod->state == MODULE_STATE_UNFORMED)
3457 if (within_module_init(addr, mod) ||
3458 within_module_core(addr, mod)) {
3460 *modname = mod->name;
3461 ret = get_ksymbol(mod, addr, size, offset);
3465 /* Make a copy in here where it's safe */
3467 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
3474 int lookup_module_symbol_name(unsigned long addr, char *symname)
3479 list_for_each_entry_rcu(mod, &modules, list) {
3480 if (mod->state == MODULE_STATE_UNFORMED)
3482 if (within_module_init(addr, mod) ||
3483 within_module_core(addr, mod)) {
3486 sym = get_ksymbol(mod, addr, NULL, NULL);
3489 strlcpy(symname, sym, KSYM_NAME_LEN);
3499 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
3500 unsigned long *offset, char *modname, char *name)
3505 list_for_each_entry_rcu(mod, &modules, list) {
3506 if (mod->state == MODULE_STATE_UNFORMED)
3508 if (within_module_init(addr, mod) ||
3509 within_module_core(addr, mod)) {
3512 sym = get_ksymbol(mod, addr, size, offset);
3516 strlcpy(modname, mod->name, MODULE_NAME_LEN);
3518 strlcpy(name, sym, KSYM_NAME_LEN);
3528 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
3529 char *name, char *module_name, int *exported)
3534 list_for_each_entry_rcu(mod, &modules, list) {
3535 if (mod->state == MODULE_STATE_UNFORMED)
3537 if (symnum < mod->num_symtab) {
3538 *value = mod->symtab[symnum].st_value;
3539 *type = mod->symtab[symnum].st_info;
3540 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
3542 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
3543 *exported = is_exported(name, *value, mod);
3547 symnum -= mod->num_symtab;
3553 static unsigned long mod_find_symname(struct module *mod, const char *name)
3557 for (i = 0; i < mod->num_symtab; i++)
3558 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
3559 mod->symtab[i].st_info != 'U')
3560 return mod->symtab[i].st_value;
3564 /* Look for this name: can be of form module:name. */
3565 unsigned long module_kallsyms_lookup_name(const char *name)
3569 unsigned long ret = 0;
3571 /* Don't lock: we're in enough trouble already. */
3573 if ((colon = strchr(name, ':')) != NULL) {
3575 if ((mod = find_module(name)) != NULL)
3576 ret = mod_find_symname(mod, colon+1);
3579 list_for_each_entry_rcu(mod, &modules, list) {
3580 if (mod->state == MODULE_STATE_UNFORMED)
3582 if ((ret = mod_find_symname(mod, name)) != 0)
3590 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
3591 struct module *, unsigned long),
3598 list_for_each_entry(mod, &modules, list) {
3599 if (mod->state == MODULE_STATE_UNFORMED)
3601 for (i = 0; i < mod->num_symtab; i++) {
3602 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
3603 mod, mod->symtab[i].st_value);
3610 #endif /* CONFIG_KALLSYMS */
3612 static char *module_flags(struct module *mod, char *buf)
3616 BUG_ON(mod->state == MODULE_STATE_UNFORMED);
3618 mod->state == MODULE_STATE_GOING ||
3619 mod->state == MODULE_STATE_COMING) {
3621 bx += module_flags_taint(mod, buf + bx);
3622 /* Show a - for module-is-being-unloaded */
3623 if (mod->state == MODULE_STATE_GOING)
3625 /* Show a + for module-is-being-loaded */
3626 if (mod->state == MODULE_STATE_COMING)
3635 #ifdef CONFIG_PROC_FS
3636 /* Called by the /proc file system to return a list of modules. */
3637 static void *m_start(struct seq_file *m, loff_t *pos)
3639 mutex_lock(&module_mutex);
3640 return seq_list_start(&modules, *pos);
3643 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
3645 return seq_list_next(p, &modules, pos);
3648 static void m_stop(struct seq_file *m, void *p)
3650 mutex_unlock(&module_mutex);
3653 static int m_show(struct seq_file *m, void *p)
3655 struct module *mod = list_entry(p, struct module, list);
3658 /* We always ignore unformed modules. */
3659 if (mod->state == MODULE_STATE_UNFORMED)
3662 seq_printf(m, "%s %u",
3663 mod->name, mod->init_size + mod->core_size);
3664 print_unload_info(m, mod);
3666 /* Informative for users. */
3667 seq_printf(m, " %s",
3668 mod->state == MODULE_STATE_GOING ? "Unloading":
3669 mod->state == MODULE_STATE_COMING ? "Loading":
3671 /* Used by oprofile and other similar tools. */
3672 seq_printf(m, " 0x%pK", mod->module_core);
3676 seq_printf(m, " %s", module_flags(mod, buf));
3678 seq_printf(m, "\n");
3682 /* Format: modulename size refcount deps address
3684 Where refcount is a number or -, and deps is a comma-separated list
3687 static const struct seq_operations modules_op = {
3694 static int modules_open(struct inode *inode, struct file *file)
3696 return seq_open(file, &modules_op);
3699 static const struct file_operations proc_modules_operations = {
3700 .open = modules_open,
3702 .llseek = seq_lseek,
3703 .release = seq_release,
3706 static int __init proc_modules_init(void)
3708 proc_create("modules", 0, NULL, &proc_modules_operations);
3711 module_init(proc_modules_init);
3714 /* Given an address, look for it in the module exception tables. */
3715 const struct exception_table_entry *search_module_extables(unsigned long addr)
3717 const struct exception_table_entry *e = NULL;
3721 list_for_each_entry_rcu(mod, &modules, list) {
3722 if (mod->state == MODULE_STATE_UNFORMED)
3724 if (mod->num_exentries == 0)
3727 e = search_extable(mod->extable,
3728 mod->extable + mod->num_exentries - 1,
3735 /* Now, if we found one, we are running inside it now, hence
3736 we cannot unload the module, hence no refcnt needed. */
3741 * is_module_address - is this address inside a module?
3742 * @addr: the address to check.
3744 * See is_module_text_address() if you simply want to see if the address
3745 * is code (not data).
3747 bool is_module_address(unsigned long addr)
3752 ret = __module_address(addr) != NULL;
3759 * __module_address - get the module which contains an address.
3760 * @addr: the address.
3762 * Must be called with preempt disabled or module mutex held so that
3763 * module doesn't get freed during this.
3765 struct module *__module_address(unsigned long addr)
3769 if (addr < module_addr_min || addr > module_addr_max)
3772 list_for_each_entry_rcu(mod, &modules, list) {
3773 if (mod->state == MODULE_STATE_UNFORMED)
3775 if (within_module_core(addr, mod)
3776 || within_module_init(addr, mod))
3781 EXPORT_SYMBOL_GPL(__module_address);
3784 * is_module_text_address - is this address inside module code?
3785 * @addr: the address to check.
3787 * See is_module_address() if you simply want to see if the address is
3788 * anywhere in a module. See kernel_text_address() for testing if an
3789 * address corresponds to kernel or module code.
3791 bool is_module_text_address(unsigned long addr)
3796 ret = __module_text_address(addr) != NULL;
3803 * __module_text_address - get the module whose code contains an address.
3804 * @addr: the address.
3806 * Must be called with preempt disabled or module mutex held so that
3807 * module doesn't get freed during this.
3809 struct module *__module_text_address(unsigned long addr)
3811 struct module *mod = __module_address(addr);
3813 /* Make sure it's within the text section. */
3814 if (!within(addr, mod->module_init, mod->init_text_size)
3815 && !within(addr, mod->module_core, mod->core_text_size))
3820 EXPORT_SYMBOL_GPL(__module_text_address);
3822 /* Don't grab lock, we're oopsing. */
3823 void print_modules(void)
3828 printk(KERN_DEFAULT "Modules linked in:");
3829 /* Most callers should already have preempt disabled, but make sure */
3831 list_for_each_entry_rcu(mod, &modules, list) {
3832 if (mod->state == MODULE_STATE_UNFORMED)
3834 printk(" %s%s", mod->name, module_flags(mod, buf));
3837 if (last_unloaded_module[0])
3838 printk(" [last unloaded: %s]", last_unloaded_module);
3842 #ifdef CONFIG_MODVERSIONS
3843 /* Generate the signature for all relevant module structures here.
3844 * If these change, we don't want to try to parse the module. */
3845 void module_layout(struct module *mod,
3846 struct modversion_info *ver,
3847 struct kernel_param *kp,
3848 struct kernel_symbol *ks,
3849 struct tracepoint * const *tp)
3852 EXPORT_SYMBOL(module_layout);