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/seq_file.h>
33 #include <linux/syscalls.h>
34 #include <linux/fcntl.h>
35 #include <linux/rcupdate.h>
36 #include <linux/capability.h>
37 #include <linux/cpu.h>
38 #include <linux/moduleparam.h>
39 #include <linux/errno.h>
40 #include <linux/err.h>
41 #include <linux/vermagic.h>
42 #include <linux/notifier.h>
43 #include <linux/sched.h>
44 #include <linux/stop_machine.h>
45 #include <linux/device.h>
46 #include <linux/string.h>
47 #include <linux/mutex.h>
48 #include <linux/rculist.h>
49 #include <asm/uaccess.h>
50 #include <asm/cacheflush.h>
51 #include <asm/mmu_context.h>
52 #include <linux/license.h>
53 #include <asm/sections.h>
54 #include <linux/tracepoint.h>
55 #include <linux/ftrace.h>
56 #include <linux/async.h>
57 #include <linux/percpu.h>
58 #include <linux/kmemleak.h>
59 #include <linux/jump_label.h>
60 #include <linux/pfn.h>
61 #include <linux/bsearch.h>
62 #include <linux/fips.h>
63 #include <uapi/linux/module.h>
64 #include "module-internal.h"
66 #define CREATE_TRACE_POINTS
67 #include <trace/events/module.h>
69 #ifndef ARCH_SHF_SMALL
70 #define ARCH_SHF_SMALL 0
74 * Modules' sections will be aligned on page boundaries
75 * to ensure complete separation of code and data, but
76 * only when CONFIG_DEBUG_SET_MODULE_RONX=y
78 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
79 # define debug_align(X) ALIGN(X, PAGE_SIZE)
81 # define debug_align(X) (X)
85 * Given BASE and SIZE this macro calculates the number of pages the
86 * memory regions occupies
88 #define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \
89 (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \
90 PFN_DOWN((unsigned long)BASE) + 1) \
93 /* If this is set, the section belongs in the init part of the module */
94 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
98 * 1) List of modules (also safely readable with preempt_disable),
99 * 2) module_use links,
100 * 3) module_addr_min/module_addr_max.
101 * (delete uses stop_machine/add uses RCU list operations). */
102 DEFINE_MUTEX(module_mutex);
103 EXPORT_SYMBOL_GPL(module_mutex);
104 static LIST_HEAD(modules);
105 #ifdef CONFIG_KGDB_KDB
106 struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
107 #endif /* CONFIG_KGDB_KDB */
109 #ifdef CONFIG_MODULE_SIG
110 #ifdef CONFIG_MODULE_SIG_FORCE
111 static bool sig_enforce = true;
113 static bool sig_enforce = false;
115 static int param_set_bool_enable_only(const char *val,
116 const struct kernel_param *kp)
120 struct kernel_param dummy_kp = *kp;
122 dummy_kp.arg = &test;
124 err = param_set_bool(val, &dummy_kp);
128 /* Don't let them unset it once it's set! */
129 if (!test && sig_enforce)
137 static const struct kernel_param_ops param_ops_bool_enable_only = {
138 .set = param_set_bool_enable_only,
139 .get = param_get_bool,
141 #define param_check_bool_enable_only param_check_bool
143 module_param(sig_enforce, bool_enable_only, 0644);
144 #endif /* !CONFIG_MODULE_SIG_FORCE */
145 #endif /* CONFIG_MODULE_SIG */
147 /* Block module loading/unloading? */
148 int modules_disabled = 0;
149 core_param(nomodule, modules_disabled, bint, 0);
151 /* Waiting for a module to finish initializing? */
152 static DECLARE_WAIT_QUEUE_HEAD(module_wq);
154 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
156 /* Bounds of module allocation, for speeding __module_address.
157 * Protected by module_mutex. */
158 static unsigned long module_addr_min = -1UL, module_addr_max = 0;
160 int register_module_notifier(struct notifier_block * nb)
162 return blocking_notifier_chain_register(&module_notify_list, nb);
164 EXPORT_SYMBOL(register_module_notifier);
166 int unregister_module_notifier(struct notifier_block * nb)
168 return blocking_notifier_chain_unregister(&module_notify_list, nb);
170 EXPORT_SYMBOL(unregister_module_notifier);
176 char *secstrings, *strtab;
177 unsigned long symoffs, stroffs;
178 struct _ddebug *debug;
179 unsigned int num_debug;
182 unsigned int sym, str, mod, vers, info, pcpu;
186 /* We require a truly strong try_module_get(): 0 means failure due to
187 ongoing or failed initialization etc. */
188 static inline int strong_try_module_get(struct module *mod)
190 if (mod && mod->state == MODULE_STATE_COMING)
192 if (try_module_get(mod))
198 static inline void add_taint_module(struct module *mod, unsigned flag)
201 mod->taints |= (1U << flag);
205 * A thread that wants to hold a reference to a module only while it
206 * is running can call this to safely exit. nfsd and lockd use this.
208 void __module_put_and_exit(struct module *mod, long code)
213 EXPORT_SYMBOL(__module_put_and_exit);
215 /* Find a module section: 0 means not found. */
216 static unsigned int find_sec(const struct load_info *info, const char *name)
220 for (i = 1; i < info->hdr->e_shnum; i++) {
221 Elf_Shdr *shdr = &info->sechdrs[i];
222 /* Alloc bit cleared means "ignore it." */
223 if ((shdr->sh_flags & SHF_ALLOC)
224 && strcmp(info->secstrings + shdr->sh_name, name) == 0)
230 /* Find a module section, or NULL. */
231 static void *section_addr(const struct load_info *info, const char *name)
233 /* Section 0 has sh_addr 0. */
234 return (void *)info->sechdrs[find_sec(info, name)].sh_addr;
237 /* Find a module section, or NULL. Fill in number of "objects" in section. */
238 static void *section_objs(const struct load_info *info,
243 unsigned int sec = find_sec(info, name);
245 /* Section 0 has sh_addr 0 and sh_size 0. */
246 *num = info->sechdrs[sec].sh_size / object_size;
247 return (void *)info->sechdrs[sec].sh_addr;
250 /* Provided by the linker */
251 extern const struct kernel_symbol __start___ksymtab[];
252 extern const struct kernel_symbol __stop___ksymtab[];
253 extern const struct kernel_symbol __start___ksymtab_gpl[];
254 extern const struct kernel_symbol __stop___ksymtab_gpl[];
255 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
256 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
257 extern const unsigned long __start___kcrctab[];
258 extern const unsigned long __start___kcrctab_gpl[];
259 extern const unsigned long __start___kcrctab_gpl_future[];
260 #ifdef CONFIG_UNUSED_SYMBOLS
261 extern const struct kernel_symbol __start___ksymtab_unused[];
262 extern const struct kernel_symbol __stop___ksymtab_unused[];
263 extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
264 extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
265 extern const unsigned long __start___kcrctab_unused[];
266 extern const unsigned long __start___kcrctab_unused_gpl[];
269 #ifndef CONFIG_MODVERSIONS
270 #define symversion(base, idx) NULL
272 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
275 static bool each_symbol_in_section(const struct symsearch *arr,
276 unsigned int arrsize,
277 struct module *owner,
278 bool (*fn)(const struct symsearch *syms,
279 struct module *owner,
285 for (j = 0; j < arrsize; j++) {
286 if (fn(&arr[j], owner, data))
293 /* Returns true as soon as fn returns true, otherwise false. */
294 bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
295 struct module *owner,
300 static const struct symsearch arr[] = {
301 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
302 NOT_GPL_ONLY, false },
303 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
304 __start___kcrctab_gpl,
306 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
307 __start___kcrctab_gpl_future,
308 WILL_BE_GPL_ONLY, false },
309 #ifdef CONFIG_UNUSED_SYMBOLS
310 { __start___ksymtab_unused, __stop___ksymtab_unused,
311 __start___kcrctab_unused,
312 NOT_GPL_ONLY, true },
313 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
314 __start___kcrctab_unused_gpl,
319 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
322 list_for_each_entry_rcu(mod, &modules, list) {
323 struct symsearch arr[] = {
324 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
325 NOT_GPL_ONLY, false },
326 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
329 { mod->gpl_future_syms,
330 mod->gpl_future_syms + mod->num_gpl_future_syms,
331 mod->gpl_future_crcs,
332 WILL_BE_GPL_ONLY, false },
333 #ifdef CONFIG_UNUSED_SYMBOLS
335 mod->unused_syms + mod->num_unused_syms,
337 NOT_GPL_ONLY, true },
338 { mod->unused_gpl_syms,
339 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
340 mod->unused_gpl_crcs,
345 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
350 EXPORT_SYMBOL_GPL(each_symbol_section);
352 struct find_symbol_arg {
359 struct module *owner;
360 const unsigned long *crc;
361 const struct kernel_symbol *sym;
364 static bool check_symbol(const struct symsearch *syms,
365 struct module *owner,
366 unsigned int symnum, void *data)
368 struct find_symbol_arg *fsa = data;
371 if (syms->licence == GPL_ONLY)
373 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
374 printk(KERN_WARNING "Symbol %s is being used "
375 "by a non-GPL module, which will not "
376 "be allowed in the future\n", fsa->name);
377 printk(KERN_WARNING "Please see the file "
378 "Documentation/feature-removal-schedule.txt "
379 "in the kernel source tree for more details.\n");
383 #ifdef CONFIG_UNUSED_SYMBOLS
384 if (syms->unused && fsa->warn) {
385 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
386 "however this module is using it.\n", fsa->name);
388 "This symbol will go away in the future.\n");
390 "Please evalute if this is the right api to use and if "
391 "it really is, submit a report the linux kernel "
392 "mailinglist together with submitting your code for "
398 fsa->crc = symversion(syms->crcs, symnum);
399 fsa->sym = &syms->start[symnum];
403 static int cmp_name(const void *va, const void *vb)
406 const struct kernel_symbol *b;
408 return strcmp(a, b->name);
411 static bool find_symbol_in_section(const struct symsearch *syms,
412 struct module *owner,
415 struct find_symbol_arg *fsa = data;
416 struct kernel_symbol *sym;
418 sym = bsearch(fsa->name, syms->start, syms->stop - syms->start,
419 sizeof(struct kernel_symbol), cmp_name);
421 if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data))
427 /* Find a symbol and return it, along with, (optional) crc and
428 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
429 const struct kernel_symbol *find_symbol(const char *name,
430 struct module **owner,
431 const unsigned long **crc,
435 struct find_symbol_arg fsa;
441 if (each_symbol_section(find_symbol_in_section, &fsa)) {
449 pr_debug("Failed to find symbol %s\n", name);
452 EXPORT_SYMBOL_GPL(find_symbol);
454 /* Search for module by name: must hold module_mutex. */
455 struct module *find_module(const char *name)
459 list_for_each_entry(mod, &modules, list) {
460 if (strcmp(mod->name, name) == 0)
465 EXPORT_SYMBOL_GPL(find_module);
469 static inline void __percpu *mod_percpu(struct module *mod)
474 static int percpu_modalloc(struct module *mod,
475 unsigned long size, unsigned long align)
477 if (align > PAGE_SIZE) {
478 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
479 mod->name, align, PAGE_SIZE);
483 mod->percpu = __alloc_reserved_percpu(size, align);
486 "%s: Could not allocate %lu bytes percpu data\n",
490 mod->percpu_size = size;
494 static void percpu_modfree(struct module *mod)
496 free_percpu(mod->percpu);
499 static unsigned int find_pcpusec(struct load_info *info)
501 return find_sec(info, ".data..percpu");
504 static void percpu_modcopy(struct module *mod,
505 const void *from, unsigned long size)
509 for_each_possible_cpu(cpu)
510 memcpy(per_cpu_ptr(mod->percpu, cpu), from, size);
514 * is_module_percpu_address - test whether address is from module static percpu
515 * @addr: address to test
517 * Test whether @addr belongs to module static percpu area.
520 * %true if @addr is from module static percpu area
522 bool is_module_percpu_address(unsigned long addr)
529 list_for_each_entry_rcu(mod, &modules, list) {
530 if (!mod->percpu_size)
532 for_each_possible_cpu(cpu) {
533 void *start = per_cpu_ptr(mod->percpu, cpu);
535 if ((void *)addr >= start &&
536 (void *)addr < start + mod->percpu_size) {
547 #else /* ... !CONFIG_SMP */
549 static inline void __percpu *mod_percpu(struct module *mod)
553 static inline int percpu_modalloc(struct module *mod,
554 unsigned long size, unsigned long align)
558 static inline void percpu_modfree(struct module *mod)
561 static unsigned int find_pcpusec(struct load_info *info)
565 static inline void percpu_modcopy(struct module *mod,
566 const void *from, unsigned long size)
568 /* pcpusec should be 0, and size of that section should be 0. */
571 bool is_module_percpu_address(unsigned long addr)
576 #endif /* CONFIG_SMP */
578 #define MODINFO_ATTR(field) \
579 static void setup_modinfo_##field(struct module *mod, const char *s) \
581 mod->field = kstrdup(s, GFP_KERNEL); \
583 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
584 struct module_kobject *mk, char *buffer) \
586 return sprintf(buffer, "%s\n", mk->mod->field); \
588 static int modinfo_##field##_exists(struct module *mod) \
590 return mod->field != NULL; \
592 static void free_modinfo_##field(struct module *mod) \
597 static struct module_attribute modinfo_##field = { \
598 .attr = { .name = __stringify(field), .mode = 0444 }, \
599 .show = show_modinfo_##field, \
600 .setup = setup_modinfo_##field, \
601 .test = modinfo_##field##_exists, \
602 .free = free_modinfo_##field, \
605 MODINFO_ATTR(version);
606 MODINFO_ATTR(srcversion);
608 static char last_unloaded_module[MODULE_NAME_LEN+1];
610 #ifdef CONFIG_MODULE_UNLOAD
612 EXPORT_TRACEPOINT_SYMBOL(module_get);
614 /* Init the unload section of the module. */
615 static int module_unload_init(struct module *mod)
617 mod->refptr = alloc_percpu(struct module_ref);
621 INIT_LIST_HEAD(&mod->source_list);
622 INIT_LIST_HEAD(&mod->target_list);
624 /* Hold reference count during initialization. */
625 __this_cpu_write(mod->refptr->incs, 1);
626 /* Backwards compatibility macros put refcount during init. */
627 mod->waiter = current;
632 /* Does a already use b? */
633 static int already_uses(struct module *a, struct module *b)
635 struct module_use *use;
637 list_for_each_entry(use, &b->source_list, source_list) {
638 if (use->source == a) {
639 pr_debug("%s uses %s!\n", a->name, b->name);
643 pr_debug("%s does not use %s!\n", a->name, b->name);
649 * - we add 'a' as a "source", 'b' as a "target" of module use
650 * - the module_use is added to the list of 'b' sources (so
651 * 'b' can walk the list to see who sourced them), and of 'a'
652 * targets (so 'a' can see what modules it targets).
654 static int add_module_usage(struct module *a, struct module *b)
656 struct module_use *use;
658 pr_debug("Allocating new usage for %s.\n", a->name);
659 use = kmalloc(sizeof(*use), GFP_ATOMIC);
661 printk(KERN_WARNING "%s: out of memory loading\n", a->name);
667 list_add(&use->source_list, &b->source_list);
668 list_add(&use->target_list, &a->target_list);
672 /* Module a uses b: caller needs module_mutex() */
673 int ref_module(struct module *a, struct module *b)
677 if (b == NULL || already_uses(a, b))
680 /* If module isn't available, we fail. */
681 err = strong_try_module_get(b);
685 err = add_module_usage(a, b);
692 EXPORT_SYMBOL_GPL(ref_module);
694 /* Clear the unload stuff of the module. */
695 static void module_unload_free(struct module *mod)
697 struct module_use *use, *tmp;
699 mutex_lock(&module_mutex);
700 list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) {
701 struct module *i = use->target;
702 pr_debug("%s unusing %s\n", mod->name, i->name);
704 list_del(&use->source_list);
705 list_del(&use->target_list);
708 mutex_unlock(&module_mutex);
710 free_percpu(mod->refptr);
713 #ifdef CONFIG_MODULE_FORCE_UNLOAD
714 static inline int try_force_unload(unsigned int flags)
716 int ret = (flags & O_TRUNC);
718 add_taint(TAINT_FORCED_RMMOD);
722 static inline int try_force_unload(unsigned int flags)
726 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
735 /* Whole machine is stopped with interrupts off when this runs. */
736 static int __try_stop_module(void *_sref)
738 struct stopref *sref = _sref;
740 /* If it's not unused, quit unless we're forcing. */
741 if (module_refcount(sref->mod) != 0) {
742 if (!(*sref->forced = try_force_unload(sref->flags)))
746 /* Mark it as dying. */
747 sref->mod->state = MODULE_STATE_GOING;
751 static int try_stop_module(struct module *mod, int flags, int *forced)
753 if (flags & O_NONBLOCK) {
754 struct stopref sref = { mod, flags, forced };
756 return stop_machine(__try_stop_module, &sref, NULL);
758 /* We don't need to stop the machine for this. */
759 mod->state = MODULE_STATE_GOING;
765 unsigned long module_refcount(struct module *mod)
767 unsigned long incs = 0, decs = 0;
770 for_each_possible_cpu(cpu)
771 decs += per_cpu_ptr(mod->refptr, cpu)->decs;
773 * ensure the incs are added up after the decs.
774 * module_put ensures incs are visible before decs with smp_wmb.
776 * This 2-count scheme avoids the situation where the refcount
777 * for CPU0 is read, then CPU0 increments the module refcount,
778 * then CPU1 drops that refcount, then the refcount for CPU1 is
779 * read. We would record a decrement but not its corresponding
780 * increment so we would see a low count (disaster).
782 * Rare situation? But module_refcount can be preempted, and we
783 * might be tallying up 4096+ CPUs. So it is not impossible.
786 for_each_possible_cpu(cpu)
787 incs += per_cpu_ptr(mod->refptr, cpu)->incs;
790 EXPORT_SYMBOL(module_refcount);
792 /* This exists whether we can unload or not */
793 static void free_module(struct module *mod);
795 static void wait_for_zero_refcount(struct module *mod)
797 /* Since we might sleep for some time, release the mutex first */
798 mutex_unlock(&module_mutex);
800 pr_debug("Looking at refcount...\n");
801 set_current_state(TASK_UNINTERRUPTIBLE);
802 if (module_refcount(mod) == 0)
806 current->state = TASK_RUNNING;
807 mutex_lock(&module_mutex);
810 SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
814 char name[MODULE_NAME_LEN];
817 if (!capable(CAP_SYS_MODULE) || modules_disabled)
820 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
822 name[MODULE_NAME_LEN-1] = '\0';
824 if (mutex_lock_interruptible(&module_mutex) != 0)
827 mod = find_module(name);
833 if (!list_empty(&mod->source_list)) {
834 /* Other modules depend on us: get rid of them first. */
839 /* Doing init or already dying? */
840 if (mod->state != MODULE_STATE_LIVE) {
841 /* FIXME: if (force), slam module count and wake up
843 pr_debug("%s already dying\n", mod->name);
848 /* If it has an init func, it must have an exit func to unload */
849 if (mod->init && !mod->exit) {
850 forced = try_force_unload(flags);
852 /* This module can't be removed */
858 /* Set this up before setting mod->state */
859 mod->waiter = current;
861 /* Stop the machine so refcounts can't move and disable module. */
862 ret = try_stop_module(mod, flags, &forced);
866 /* Never wait if forced. */
867 if (!forced && module_refcount(mod) != 0)
868 wait_for_zero_refcount(mod);
870 mutex_unlock(&module_mutex);
871 /* Final destruction now no one is using it. */
872 if (mod->exit != NULL)
874 blocking_notifier_call_chain(&module_notify_list,
875 MODULE_STATE_GOING, mod);
876 async_synchronize_full();
878 /* Store the name of the last unloaded module for diagnostic purposes */
879 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
884 mutex_unlock(&module_mutex);
888 static inline void print_unload_info(struct seq_file *m, struct module *mod)
890 struct module_use *use;
891 int printed_something = 0;
893 seq_printf(m, " %lu ", module_refcount(mod));
895 /* Always include a trailing , so userspace can differentiate
896 between this and the old multi-field proc format. */
897 list_for_each_entry(use, &mod->source_list, source_list) {
898 printed_something = 1;
899 seq_printf(m, "%s,", use->source->name);
902 if (mod->init != NULL && mod->exit == NULL) {
903 printed_something = 1;
904 seq_printf(m, "[permanent],");
907 if (!printed_something)
911 void __symbol_put(const char *symbol)
913 struct module *owner;
916 if (!find_symbol(symbol, &owner, NULL, true, false))
921 EXPORT_SYMBOL(__symbol_put);
923 /* Note this assumes addr is a function, which it currently always is. */
924 void symbol_put_addr(void *addr)
926 struct module *modaddr;
927 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
929 if (core_kernel_text(a))
932 /* module_text_address is safe here: we're supposed to have reference
933 * to module from symbol_get, so it can't go away. */
934 modaddr = __module_text_address(a);
938 EXPORT_SYMBOL_GPL(symbol_put_addr);
940 static ssize_t show_refcnt(struct module_attribute *mattr,
941 struct module_kobject *mk, char *buffer)
943 return sprintf(buffer, "%lu\n", module_refcount(mk->mod));
946 static struct module_attribute modinfo_refcnt =
947 __ATTR(refcnt, 0444, show_refcnt, NULL);
949 void __module_get(struct module *module)
953 __this_cpu_inc(module->refptr->incs);
954 trace_module_get(module, _RET_IP_);
958 EXPORT_SYMBOL(__module_get);
960 bool try_module_get(struct module *module)
967 if (likely(module_is_live(module))) {
968 __this_cpu_inc(module->refptr->incs);
969 trace_module_get(module, _RET_IP_);
977 EXPORT_SYMBOL(try_module_get);
979 void module_put(struct module *module)
983 smp_wmb(); /* see comment in module_refcount */
984 __this_cpu_inc(module->refptr->decs);
986 trace_module_put(module, _RET_IP_);
987 /* Maybe they're waiting for us to drop reference? */
988 if (unlikely(!module_is_live(module)))
989 wake_up_process(module->waiter);
993 EXPORT_SYMBOL(module_put);
995 #else /* !CONFIG_MODULE_UNLOAD */
996 static inline void print_unload_info(struct seq_file *m, struct module *mod)
998 /* We don't know the usage count, or what modules are using. */
999 seq_printf(m, " - -");
1002 static inline void module_unload_free(struct module *mod)
1006 int ref_module(struct module *a, struct module *b)
1008 return strong_try_module_get(b);
1010 EXPORT_SYMBOL_GPL(ref_module);
1012 static inline int module_unload_init(struct module *mod)
1016 #endif /* CONFIG_MODULE_UNLOAD */
1018 static size_t module_flags_taint(struct module *mod, char *buf)
1022 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
1024 if (mod->taints & (1 << TAINT_OOT_MODULE))
1026 if (mod->taints & (1 << TAINT_FORCED_MODULE))
1028 if (mod->taints & (1 << TAINT_CRAP))
1031 * TAINT_FORCED_RMMOD: could be added.
1032 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
1038 static ssize_t show_initstate(struct module_attribute *mattr,
1039 struct module_kobject *mk, char *buffer)
1041 const char *state = "unknown";
1043 switch (mk->mod->state) {
1044 case MODULE_STATE_LIVE:
1047 case MODULE_STATE_COMING:
1050 case MODULE_STATE_GOING:
1054 return sprintf(buffer, "%s\n", state);
1057 static struct module_attribute modinfo_initstate =
1058 __ATTR(initstate, 0444, show_initstate, NULL);
1060 static ssize_t store_uevent(struct module_attribute *mattr,
1061 struct module_kobject *mk,
1062 const char *buffer, size_t count)
1064 enum kobject_action action;
1066 if (kobject_action_type(buffer, count, &action) == 0)
1067 kobject_uevent(&mk->kobj, action);
1071 struct module_attribute module_uevent =
1072 __ATTR(uevent, 0200, NULL, store_uevent);
1074 static ssize_t show_coresize(struct module_attribute *mattr,
1075 struct module_kobject *mk, char *buffer)
1077 return sprintf(buffer, "%u\n", mk->mod->core_size);
1080 static struct module_attribute modinfo_coresize =
1081 __ATTR(coresize, 0444, show_coresize, NULL);
1083 static ssize_t show_initsize(struct module_attribute *mattr,
1084 struct module_kobject *mk, char *buffer)
1086 return sprintf(buffer, "%u\n", mk->mod->init_size);
1089 static struct module_attribute modinfo_initsize =
1090 __ATTR(initsize, 0444, show_initsize, NULL);
1092 static ssize_t show_taint(struct module_attribute *mattr,
1093 struct module_kobject *mk, char *buffer)
1097 l = module_flags_taint(mk->mod, buffer);
1102 static struct module_attribute modinfo_taint =
1103 __ATTR(taint, 0444, show_taint, NULL);
1105 static struct module_attribute *modinfo_attrs[] = {
1108 &modinfo_srcversion,
1113 #ifdef CONFIG_MODULE_UNLOAD
1119 static const char vermagic[] = VERMAGIC_STRING;
1121 static int try_to_force_load(struct module *mod, const char *reason)
1123 #ifdef CONFIG_MODULE_FORCE_LOAD
1124 if (!test_taint(TAINT_FORCED_MODULE))
1125 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
1127 add_taint_module(mod, TAINT_FORCED_MODULE);
1134 #ifdef CONFIG_MODVERSIONS
1135 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1136 static unsigned long maybe_relocated(unsigned long crc,
1137 const struct module *crc_owner)
1139 #ifdef ARCH_RELOCATES_KCRCTAB
1140 if (crc_owner == NULL)
1141 return crc - (unsigned long)reloc_start;
1146 static int check_version(Elf_Shdr *sechdrs,
1147 unsigned int versindex,
1148 const char *symname,
1150 const unsigned long *crc,
1151 const struct module *crc_owner)
1153 unsigned int i, num_versions;
1154 struct modversion_info *versions;
1156 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1160 /* No versions at all? modprobe --force does this. */
1162 return try_to_force_load(mod, symname) == 0;
1164 versions = (void *) sechdrs[versindex].sh_addr;
1165 num_versions = sechdrs[versindex].sh_size
1166 / sizeof(struct modversion_info);
1168 for (i = 0; i < num_versions; i++) {
1169 if (strcmp(versions[i].name, symname) != 0)
1172 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
1174 pr_debug("Found checksum %lX vs module %lX\n",
1175 maybe_relocated(*crc, crc_owner), versions[i].crc);
1179 printk(KERN_WARNING "%s: no symbol version for %s\n",
1180 mod->name, symname);
1184 printk("%s: disagrees about version of symbol %s\n",
1185 mod->name, symname);
1189 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1190 unsigned int versindex,
1193 const unsigned long *crc;
1195 /* Since this should be found in kernel (which can't be removed),
1196 * no locking is necessary. */
1197 if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
1200 return check_version(sechdrs, versindex, "module_layout", mod, crc,
1204 /* First part is kernel version, which we ignore if module has crcs. */
1205 static inline int same_magic(const char *amagic, const char *bmagic,
1209 amagic += strcspn(amagic, " ");
1210 bmagic += strcspn(bmagic, " ");
1212 return strcmp(amagic, bmagic) == 0;
1215 static inline int check_version(Elf_Shdr *sechdrs,
1216 unsigned int versindex,
1217 const char *symname,
1219 const unsigned long *crc,
1220 const struct module *crc_owner)
1225 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1226 unsigned int versindex,
1232 static inline int same_magic(const char *amagic, const char *bmagic,
1235 return strcmp(amagic, bmagic) == 0;
1237 #endif /* CONFIG_MODVERSIONS */
1239 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1240 static const struct kernel_symbol *resolve_symbol(struct module *mod,
1241 const struct load_info *info,
1245 struct module *owner;
1246 const struct kernel_symbol *sym;
1247 const unsigned long *crc;
1250 mutex_lock(&module_mutex);
1251 sym = find_symbol(name, &owner, &crc,
1252 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
1256 if (!check_version(info->sechdrs, info->index.vers, name, mod, crc,
1258 sym = ERR_PTR(-EINVAL);
1262 err = ref_module(mod, owner);
1269 /* We must make copy under the lock if we failed to get ref. */
1270 strncpy(ownername, module_name(owner), MODULE_NAME_LEN);
1272 mutex_unlock(&module_mutex);
1276 static const struct kernel_symbol *
1277 resolve_symbol_wait(struct module *mod,
1278 const struct load_info *info,
1281 const struct kernel_symbol *ksym;
1282 char owner[MODULE_NAME_LEN];
1284 if (wait_event_interruptible_timeout(module_wq,
1285 !IS_ERR(ksym = resolve_symbol(mod, info, name, owner))
1286 || PTR_ERR(ksym) != -EBUSY,
1288 printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n",
1295 * /sys/module/foo/sections stuff
1296 * J. Corbet <corbet@lwn.net>
1300 #ifdef CONFIG_KALLSYMS
1301 static inline bool sect_empty(const Elf_Shdr *sect)
1303 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1306 struct module_sect_attr
1308 struct module_attribute mattr;
1310 unsigned long address;
1313 struct module_sect_attrs
1315 struct attribute_group grp;
1316 unsigned int nsections;
1317 struct module_sect_attr attrs[0];
1320 static ssize_t module_sect_show(struct module_attribute *mattr,
1321 struct module_kobject *mk, char *buf)
1323 struct module_sect_attr *sattr =
1324 container_of(mattr, struct module_sect_attr, mattr);
1325 return sprintf(buf, "0x%pK\n", (void *)sattr->address);
1328 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1330 unsigned int section;
1332 for (section = 0; section < sect_attrs->nsections; section++)
1333 kfree(sect_attrs->attrs[section].name);
1337 static void add_sect_attrs(struct module *mod, const struct load_info *info)
1339 unsigned int nloaded = 0, i, size[2];
1340 struct module_sect_attrs *sect_attrs;
1341 struct module_sect_attr *sattr;
1342 struct attribute **gattr;
1344 /* Count loaded sections and allocate structures */
1345 for (i = 0; i < info->hdr->e_shnum; i++)
1346 if (!sect_empty(&info->sechdrs[i]))
1348 size[0] = ALIGN(sizeof(*sect_attrs)
1349 + nloaded * sizeof(sect_attrs->attrs[0]),
1350 sizeof(sect_attrs->grp.attrs[0]));
1351 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1352 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1353 if (sect_attrs == NULL)
1356 /* Setup section attributes. */
1357 sect_attrs->grp.name = "sections";
1358 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1360 sect_attrs->nsections = 0;
1361 sattr = §_attrs->attrs[0];
1362 gattr = §_attrs->grp.attrs[0];
1363 for (i = 0; i < info->hdr->e_shnum; i++) {
1364 Elf_Shdr *sec = &info->sechdrs[i];
1365 if (sect_empty(sec))
1367 sattr->address = sec->sh_addr;
1368 sattr->name = kstrdup(info->secstrings + sec->sh_name,
1370 if (sattr->name == NULL)
1372 sect_attrs->nsections++;
1373 sysfs_attr_init(&sattr->mattr.attr);
1374 sattr->mattr.show = module_sect_show;
1375 sattr->mattr.store = NULL;
1376 sattr->mattr.attr.name = sattr->name;
1377 sattr->mattr.attr.mode = S_IRUGO;
1378 *(gattr++) = &(sattr++)->mattr.attr;
1382 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1385 mod->sect_attrs = sect_attrs;
1388 free_sect_attrs(sect_attrs);
1391 static void remove_sect_attrs(struct module *mod)
1393 if (mod->sect_attrs) {
1394 sysfs_remove_group(&mod->mkobj.kobj,
1395 &mod->sect_attrs->grp);
1396 /* We are positive that no one is using any sect attrs
1397 * at this point. Deallocate immediately. */
1398 free_sect_attrs(mod->sect_attrs);
1399 mod->sect_attrs = NULL;
1404 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1407 struct module_notes_attrs {
1408 struct kobject *dir;
1410 struct bin_attribute attrs[0];
1413 static ssize_t module_notes_read(struct file *filp, struct kobject *kobj,
1414 struct bin_attribute *bin_attr,
1415 char *buf, loff_t pos, size_t count)
1418 * The caller checked the pos and count against our size.
1420 memcpy(buf, bin_attr->private + pos, count);
1424 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1427 if (notes_attrs->dir) {
1429 sysfs_remove_bin_file(notes_attrs->dir,
1430 ¬es_attrs->attrs[i]);
1431 kobject_put(notes_attrs->dir);
1436 static void add_notes_attrs(struct module *mod, const struct load_info *info)
1438 unsigned int notes, loaded, i;
1439 struct module_notes_attrs *notes_attrs;
1440 struct bin_attribute *nattr;
1442 /* failed to create section attributes, so can't create notes */
1443 if (!mod->sect_attrs)
1446 /* Count notes sections and allocate structures. */
1448 for (i = 0; i < info->hdr->e_shnum; i++)
1449 if (!sect_empty(&info->sechdrs[i]) &&
1450 (info->sechdrs[i].sh_type == SHT_NOTE))
1456 notes_attrs = kzalloc(sizeof(*notes_attrs)
1457 + notes * sizeof(notes_attrs->attrs[0]),
1459 if (notes_attrs == NULL)
1462 notes_attrs->notes = notes;
1463 nattr = ¬es_attrs->attrs[0];
1464 for (loaded = i = 0; i < info->hdr->e_shnum; ++i) {
1465 if (sect_empty(&info->sechdrs[i]))
1467 if (info->sechdrs[i].sh_type == SHT_NOTE) {
1468 sysfs_bin_attr_init(nattr);
1469 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1470 nattr->attr.mode = S_IRUGO;
1471 nattr->size = info->sechdrs[i].sh_size;
1472 nattr->private = (void *) info->sechdrs[i].sh_addr;
1473 nattr->read = module_notes_read;
1479 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1480 if (!notes_attrs->dir)
1483 for (i = 0; i < notes; ++i)
1484 if (sysfs_create_bin_file(notes_attrs->dir,
1485 ¬es_attrs->attrs[i]))
1488 mod->notes_attrs = notes_attrs;
1492 free_notes_attrs(notes_attrs, i);
1495 static void remove_notes_attrs(struct module *mod)
1497 if (mod->notes_attrs)
1498 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1503 static inline void add_sect_attrs(struct module *mod,
1504 const struct load_info *info)
1508 static inline void remove_sect_attrs(struct module *mod)
1512 static inline void add_notes_attrs(struct module *mod,
1513 const struct load_info *info)
1517 static inline void remove_notes_attrs(struct module *mod)
1520 #endif /* CONFIG_KALLSYMS */
1522 static void add_usage_links(struct module *mod)
1524 #ifdef CONFIG_MODULE_UNLOAD
1525 struct module_use *use;
1528 mutex_lock(&module_mutex);
1529 list_for_each_entry(use, &mod->target_list, target_list) {
1530 nowarn = sysfs_create_link(use->target->holders_dir,
1531 &mod->mkobj.kobj, mod->name);
1533 mutex_unlock(&module_mutex);
1537 static void del_usage_links(struct module *mod)
1539 #ifdef CONFIG_MODULE_UNLOAD
1540 struct module_use *use;
1542 mutex_lock(&module_mutex);
1543 list_for_each_entry(use, &mod->target_list, target_list)
1544 sysfs_remove_link(use->target->holders_dir, mod->name);
1545 mutex_unlock(&module_mutex);
1549 static int module_add_modinfo_attrs(struct module *mod)
1551 struct module_attribute *attr;
1552 struct module_attribute *temp_attr;
1556 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1557 (ARRAY_SIZE(modinfo_attrs) + 1)),
1559 if (!mod->modinfo_attrs)
1562 temp_attr = mod->modinfo_attrs;
1563 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1565 (attr->test && attr->test(mod))) {
1566 memcpy(temp_attr, attr, sizeof(*temp_attr));
1567 sysfs_attr_init(&temp_attr->attr);
1568 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1575 static void module_remove_modinfo_attrs(struct module *mod)
1577 struct module_attribute *attr;
1580 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1581 /* pick a field to test for end of list */
1582 if (!attr->attr.name)
1584 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1588 kfree(mod->modinfo_attrs);
1591 static int mod_sysfs_init(struct module *mod)
1594 struct kobject *kobj;
1596 if (!module_sysfs_initialized) {
1597 printk(KERN_ERR "%s: module sysfs not initialized\n",
1603 kobj = kset_find_obj(module_kset, mod->name);
1605 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1611 mod->mkobj.mod = mod;
1613 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1614 mod->mkobj.kobj.kset = module_kset;
1615 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1618 kobject_put(&mod->mkobj.kobj);
1620 /* delay uevent until full sysfs population */
1625 static int mod_sysfs_setup(struct module *mod,
1626 const struct load_info *info,
1627 struct kernel_param *kparam,
1628 unsigned int num_params)
1632 err = mod_sysfs_init(mod);
1636 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1637 if (!mod->holders_dir) {
1642 err = module_param_sysfs_setup(mod, kparam, num_params);
1644 goto out_unreg_holders;
1646 err = module_add_modinfo_attrs(mod);
1648 goto out_unreg_param;
1650 add_usage_links(mod);
1651 add_sect_attrs(mod, info);
1652 add_notes_attrs(mod, info);
1654 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1658 module_param_sysfs_remove(mod);
1660 kobject_put(mod->holders_dir);
1662 kobject_put(&mod->mkobj.kobj);
1667 static void mod_sysfs_fini(struct module *mod)
1669 remove_notes_attrs(mod);
1670 remove_sect_attrs(mod);
1671 kobject_put(&mod->mkobj.kobj);
1674 #else /* !CONFIG_SYSFS */
1676 static int mod_sysfs_setup(struct module *mod,
1677 const struct load_info *info,
1678 struct kernel_param *kparam,
1679 unsigned int num_params)
1684 static void mod_sysfs_fini(struct module *mod)
1688 static void module_remove_modinfo_attrs(struct module *mod)
1692 static void del_usage_links(struct module *mod)
1696 #endif /* CONFIG_SYSFS */
1698 static void mod_sysfs_teardown(struct module *mod)
1700 del_usage_links(mod);
1701 module_remove_modinfo_attrs(mod);
1702 module_param_sysfs_remove(mod);
1703 kobject_put(mod->mkobj.drivers_dir);
1704 kobject_put(mod->holders_dir);
1705 mod_sysfs_fini(mod);
1709 * unlink the module with the whole machine is stopped with interrupts off
1710 * - this defends against kallsyms not taking locks
1712 static int __unlink_module(void *_mod)
1714 struct module *mod = _mod;
1715 list_del(&mod->list);
1716 module_bug_cleanup(mod);
1720 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
1722 * LKM RO/NX protection: protect module's text/ro-data
1723 * from modification and any data from execution.
1725 void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages))
1727 unsigned long begin_pfn = PFN_DOWN((unsigned long)start);
1728 unsigned long end_pfn = PFN_DOWN((unsigned long)end);
1730 if (end_pfn > begin_pfn)
1731 set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn);
1734 static void set_section_ro_nx(void *base,
1735 unsigned long text_size,
1736 unsigned long ro_size,
1737 unsigned long total_size)
1739 /* begin and end PFNs of the current subsection */
1740 unsigned long begin_pfn;
1741 unsigned long end_pfn;
1744 * Set RO for module text and RO-data:
1745 * - Always protect first page.
1746 * - Do not protect last partial page.
1749 set_page_attributes(base, base + ro_size, set_memory_ro);
1752 * Set NX permissions for module data:
1753 * - Do not protect first partial page.
1754 * - Always protect last page.
1756 if (total_size > text_size) {
1757 begin_pfn = PFN_UP((unsigned long)base + text_size);
1758 end_pfn = PFN_UP((unsigned long)base + total_size);
1759 if (end_pfn > begin_pfn)
1760 set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn);
1764 static void unset_module_core_ro_nx(struct module *mod)
1766 set_page_attributes(mod->module_core + mod->core_text_size,
1767 mod->module_core + mod->core_size,
1769 set_page_attributes(mod->module_core,
1770 mod->module_core + mod->core_ro_size,
1774 static void unset_module_init_ro_nx(struct module *mod)
1776 set_page_attributes(mod->module_init + mod->init_text_size,
1777 mod->module_init + mod->init_size,
1779 set_page_attributes(mod->module_init,
1780 mod->module_init + mod->init_ro_size,
1784 /* Iterate through all modules and set each module's text as RW */
1785 void set_all_modules_text_rw(void)
1789 mutex_lock(&module_mutex);
1790 list_for_each_entry_rcu(mod, &modules, list) {
1791 if ((mod->module_core) && (mod->core_text_size)) {
1792 set_page_attributes(mod->module_core,
1793 mod->module_core + mod->core_text_size,
1796 if ((mod->module_init) && (mod->init_text_size)) {
1797 set_page_attributes(mod->module_init,
1798 mod->module_init + mod->init_text_size,
1802 mutex_unlock(&module_mutex);
1805 /* Iterate through all modules and set each module's text as RO */
1806 void set_all_modules_text_ro(void)
1810 mutex_lock(&module_mutex);
1811 list_for_each_entry_rcu(mod, &modules, list) {
1812 if ((mod->module_core) && (mod->core_text_size)) {
1813 set_page_attributes(mod->module_core,
1814 mod->module_core + mod->core_text_size,
1817 if ((mod->module_init) && (mod->init_text_size)) {
1818 set_page_attributes(mod->module_init,
1819 mod->module_init + mod->init_text_size,
1823 mutex_unlock(&module_mutex);
1826 static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { }
1827 static void unset_module_core_ro_nx(struct module *mod) { }
1828 static void unset_module_init_ro_nx(struct module *mod) { }
1831 void __weak module_free(struct module *mod, void *module_region)
1833 vfree(module_region);
1836 void __weak module_arch_cleanup(struct module *mod)
1840 /* Free a module, remove from lists, etc. */
1841 static void free_module(struct module *mod)
1843 trace_module_free(mod);
1845 /* Delete from various lists */
1846 mutex_lock(&module_mutex);
1847 stop_machine(__unlink_module, mod, NULL);
1848 mutex_unlock(&module_mutex);
1849 mod_sysfs_teardown(mod);
1851 /* Remove dynamic debug info */
1852 ddebug_remove_module(mod->name);
1854 /* Arch-specific cleanup. */
1855 module_arch_cleanup(mod);
1857 /* Module unload stuff */
1858 module_unload_free(mod);
1860 /* Free any allocated parameters. */
1861 destroy_params(mod->kp, mod->num_kp);
1863 /* This may be NULL, but that's OK */
1864 unset_module_init_ro_nx(mod);
1865 module_free(mod, mod->module_init);
1867 percpu_modfree(mod);
1869 /* Free lock-classes: */
1870 lockdep_free_key_range(mod->module_core, mod->core_size);
1872 /* Finally, free the core (containing the module structure) */
1873 unset_module_core_ro_nx(mod);
1874 module_free(mod, mod->module_core);
1877 update_protections(current->mm);
1881 void *__symbol_get(const char *symbol)
1883 struct module *owner;
1884 const struct kernel_symbol *sym;
1887 sym = find_symbol(symbol, &owner, NULL, true, true);
1888 if (sym && strong_try_module_get(owner))
1892 return sym ? (void *)sym->value : NULL;
1894 EXPORT_SYMBOL_GPL(__symbol_get);
1897 * Ensure that an exported symbol [global namespace] does not already exist
1898 * in the kernel or in some other module's exported symbol table.
1900 * You must hold the module_mutex.
1902 static int verify_export_symbols(struct module *mod)
1905 struct module *owner;
1906 const struct kernel_symbol *s;
1908 const struct kernel_symbol *sym;
1911 { mod->syms, mod->num_syms },
1912 { mod->gpl_syms, mod->num_gpl_syms },
1913 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1914 #ifdef CONFIG_UNUSED_SYMBOLS
1915 { mod->unused_syms, mod->num_unused_syms },
1916 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1920 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1921 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1922 if (find_symbol(s->name, &owner, NULL, true, false)) {
1924 "%s: exports duplicate symbol %s"
1926 mod->name, s->name, module_name(owner));
1934 /* Change all symbols so that st_value encodes the pointer directly. */
1935 static int simplify_symbols(struct module *mod, const struct load_info *info)
1937 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
1938 Elf_Sym *sym = (void *)symsec->sh_addr;
1939 unsigned long secbase;
1942 const struct kernel_symbol *ksym;
1944 for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) {
1945 const char *name = info->strtab + sym[i].st_name;
1947 switch (sym[i].st_shndx) {
1949 /* We compiled with -fno-common. These are not
1950 supposed to happen. */
1951 pr_debug("Common symbol: %s\n", name);
1952 printk("%s: please compile with -fno-common\n",
1958 /* Don't need to do anything */
1959 pr_debug("Absolute symbol: 0x%08lx\n",
1960 (long)sym[i].st_value);
1964 ksym = resolve_symbol_wait(mod, info, name);
1965 /* Ok if resolved. */
1966 if (ksym && !IS_ERR(ksym)) {
1967 sym[i].st_value = ksym->value;
1972 if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1975 printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n",
1976 mod->name, name, PTR_ERR(ksym));
1977 ret = PTR_ERR(ksym) ?: -ENOENT;
1981 /* Divert to percpu allocation if a percpu var. */
1982 if (sym[i].st_shndx == info->index.pcpu)
1983 secbase = (unsigned long)mod_percpu(mod);
1985 secbase = info->sechdrs[sym[i].st_shndx].sh_addr;
1986 sym[i].st_value += secbase;
1994 static int apply_relocations(struct module *mod, const struct load_info *info)
1999 /* Now do relocations. */
2000 for (i = 1; i < info->hdr->e_shnum; i++) {
2001 unsigned int infosec = info->sechdrs[i].sh_info;
2003 /* Not a valid relocation section? */
2004 if (infosec >= info->hdr->e_shnum)
2007 /* Don't bother with non-allocated sections */
2008 if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC))
2011 if (info->sechdrs[i].sh_type == SHT_REL)
2012 err = apply_relocate(info->sechdrs, info->strtab,
2013 info->index.sym, i, mod);
2014 else if (info->sechdrs[i].sh_type == SHT_RELA)
2015 err = apply_relocate_add(info->sechdrs, info->strtab,
2016 info->index.sym, i, mod);
2023 /* Additional bytes needed by arch in front of individual sections */
2024 unsigned int __weak arch_mod_section_prepend(struct module *mod,
2025 unsigned int section)
2027 /* default implementation just returns zero */
2031 /* Update size with this section: return offset. */
2032 static long get_offset(struct module *mod, unsigned int *size,
2033 Elf_Shdr *sechdr, unsigned int section)
2037 *size += arch_mod_section_prepend(mod, section);
2038 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
2039 *size = ret + sechdr->sh_size;
2043 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
2044 might -- code, read-only data, read-write data, small data. Tally
2045 sizes, and place the offsets into sh_entsize fields: high bit means it
2047 static void layout_sections(struct module *mod, struct load_info *info)
2049 static unsigned long const masks[][2] = {
2050 /* NOTE: all executable code must be the first section
2051 * in this array; otherwise modify the text_size
2052 * finder in the two loops below */
2053 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
2054 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
2055 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
2056 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
2060 for (i = 0; i < info->hdr->e_shnum; i++)
2061 info->sechdrs[i].sh_entsize = ~0UL;
2063 pr_debug("Core section allocation order:\n");
2064 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
2065 for (i = 0; i < info->hdr->e_shnum; ++i) {
2066 Elf_Shdr *s = &info->sechdrs[i];
2067 const char *sname = info->secstrings + s->sh_name;
2069 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2070 || (s->sh_flags & masks[m][1])
2071 || s->sh_entsize != ~0UL
2072 || strstarts(sname, ".init"))
2074 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
2075 pr_debug("\t%s\n", sname);
2078 case 0: /* executable */
2079 mod->core_size = debug_align(mod->core_size);
2080 mod->core_text_size = mod->core_size;
2082 case 1: /* RO: text and ro-data */
2083 mod->core_size = debug_align(mod->core_size);
2084 mod->core_ro_size = mod->core_size;
2086 case 3: /* whole core */
2087 mod->core_size = debug_align(mod->core_size);
2092 pr_debug("Init section allocation order:\n");
2093 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
2094 for (i = 0; i < info->hdr->e_shnum; ++i) {
2095 Elf_Shdr *s = &info->sechdrs[i];
2096 const char *sname = info->secstrings + s->sh_name;
2098 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2099 || (s->sh_flags & masks[m][1])
2100 || s->sh_entsize != ~0UL
2101 || !strstarts(sname, ".init"))
2103 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
2104 | INIT_OFFSET_MASK);
2105 pr_debug("\t%s\n", sname);
2108 case 0: /* executable */
2109 mod->init_size = debug_align(mod->init_size);
2110 mod->init_text_size = mod->init_size;
2112 case 1: /* RO: text and ro-data */
2113 mod->init_size = debug_align(mod->init_size);
2114 mod->init_ro_size = mod->init_size;
2116 case 3: /* whole init */
2117 mod->init_size = debug_align(mod->init_size);
2123 static void set_license(struct module *mod, const char *license)
2126 license = "unspecified";
2128 if (!license_is_gpl_compatible(license)) {
2129 if (!test_taint(TAINT_PROPRIETARY_MODULE))
2130 printk(KERN_WARNING "%s: module license '%s' taints "
2131 "kernel.\n", mod->name, license);
2132 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2136 /* Parse tag=value strings from .modinfo section */
2137 static char *next_string(char *string, unsigned long *secsize)
2139 /* Skip non-zero chars */
2142 if ((*secsize)-- <= 1)
2146 /* Skip any zero padding. */
2147 while (!string[0]) {
2149 if ((*secsize)-- <= 1)
2155 static char *get_modinfo(struct load_info *info, const char *tag)
2158 unsigned int taglen = strlen(tag);
2159 Elf_Shdr *infosec = &info->sechdrs[info->index.info];
2160 unsigned long size = infosec->sh_size;
2162 for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) {
2163 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
2164 return p + taglen + 1;
2169 static void setup_modinfo(struct module *mod, struct load_info *info)
2171 struct module_attribute *attr;
2174 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2176 attr->setup(mod, get_modinfo(info, attr->attr.name));
2180 static void free_modinfo(struct module *mod)
2182 struct module_attribute *attr;
2185 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2191 #ifdef CONFIG_KALLSYMS
2193 /* lookup symbol in given range of kernel_symbols */
2194 static const struct kernel_symbol *lookup_symbol(const char *name,
2195 const struct kernel_symbol *start,
2196 const struct kernel_symbol *stop)
2198 return bsearch(name, start, stop - start,
2199 sizeof(struct kernel_symbol), cmp_name);
2202 static int is_exported(const char *name, unsigned long value,
2203 const struct module *mod)
2205 const struct kernel_symbol *ks;
2207 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
2209 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
2210 return ks != NULL && ks->value == value;
2214 static char elf_type(const Elf_Sym *sym, const struct load_info *info)
2216 const Elf_Shdr *sechdrs = info->sechdrs;
2218 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
2219 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
2224 if (sym->st_shndx == SHN_UNDEF)
2226 if (sym->st_shndx == SHN_ABS)
2228 if (sym->st_shndx >= SHN_LORESERVE)
2230 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
2232 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
2233 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
2234 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
2236 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
2241 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
2242 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
2247 if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name,
2254 static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
2257 const Elf_Shdr *sec;
2259 if (src->st_shndx == SHN_UNDEF
2260 || src->st_shndx >= shnum
2264 sec = sechdrs + src->st_shndx;
2265 if (!(sec->sh_flags & SHF_ALLOC)
2266 #ifndef CONFIG_KALLSYMS_ALL
2267 || !(sec->sh_flags & SHF_EXECINSTR)
2269 || (sec->sh_entsize & INIT_OFFSET_MASK))
2276 * We only allocate and copy the strings needed by the parts of symtab
2277 * we keep. This is simple, but has the effect of making multiple
2278 * copies of duplicates. We could be more sophisticated, see
2279 * linux-kernel thread starting with
2280 * <73defb5e4bca04a6431392cc341112b1@localhost>.
2282 static void layout_symtab(struct module *mod, struct load_info *info)
2284 Elf_Shdr *symsect = info->sechdrs + info->index.sym;
2285 Elf_Shdr *strsect = info->sechdrs + info->index.str;
2287 unsigned int i, nsrc, ndst, strtab_size;
2289 /* Put symbol section at end of init part of module. */
2290 symsect->sh_flags |= SHF_ALLOC;
2291 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
2292 info->index.sym) | INIT_OFFSET_MASK;
2293 pr_debug("\t%s\n", info->secstrings + symsect->sh_name);
2295 src = (void *)info->hdr + symsect->sh_offset;
2296 nsrc = symsect->sh_size / sizeof(*src);
2298 /* strtab always starts with a nul, so offset 0 is the empty string. */
2301 /* Compute total space required for the core symbols' strtab. */
2302 for (ndst = i = 0; i < nsrc; i++) {
2304 is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) {
2305 strtab_size += strlen(&info->strtab[src[i].st_name])+1;
2310 /* Append room for core symbols at end of core part. */
2311 info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
2312 info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym);
2313 mod->core_size += strtab_size;
2315 /* Put string table section at end of init part of module. */
2316 strsect->sh_flags |= SHF_ALLOC;
2317 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
2318 info->index.str) | INIT_OFFSET_MASK;
2319 pr_debug("\t%s\n", info->secstrings + strsect->sh_name);
2322 static void add_kallsyms(struct module *mod, const struct load_info *info)
2324 unsigned int i, ndst;
2328 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
2330 mod->symtab = (void *)symsec->sh_addr;
2331 mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym);
2332 /* Make sure we get permanent strtab: don't use info->strtab. */
2333 mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr;
2335 /* Set types up while we still have access to sections. */
2336 for (i = 0; i < mod->num_symtab; i++)
2337 mod->symtab[i].st_info = elf_type(&mod->symtab[i], info);
2339 mod->core_symtab = dst = mod->module_core + info->symoffs;
2340 mod->core_strtab = s = mod->module_core + info->stroffs;
2343 for (ndst = i = 0; i < mod->num_symtab; i++) {
2345 is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) {
2347 dst[ndst++].st_name = s - mod->core_strtab;
2348 s += strlcpy(s, &mod->strtab[src[i].st_name],
2352 mod->core_num_syms = ndst;
2355 static inline void layout_symtab(struct module *mod, struct load_info *info)
2359 static void add_kallsyms(struct module *mod, const struct load_info *info)
2362 #endif /* CONFIG_KALLSYMS */
2364 static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
2368 #ifdef CONFIG_DYNAMIC_DEBUG
2369 if (ddebug_add_module(debug, num, debug->modname))
2370 printk(KERN_ERR "dynamic debug error adding module: %s\n",
2375 static void dynamic_debug_remove(struct _ddebug *debug)
2378 ddebug_remove_module(debug->modname);
2381 void * __weak module_alloc(unsigned long size)
2383 return size == 0 ? NULL : vmalloc_exec(size);
2386 static void *module_alloc_update_bounds(unsigned long size)
2388 void *ret = module_alloc(size);
2391 mutex_lock(&module_mutex);
2392 /* Update module bounds. */
2393 if ((unsigned long)ret < module_addr_min)
2394 module_addr_min = (unsigned long)ret;
2395 if ((unsigned long)ret + size > module_addr_max)
2396 module_addr_max = (unsigned long)ret + size;
2397 mutex_unlock(&module_mutex);
2402 #ifdef CONFIG_DEBUG_KMEMLEAK
2403 static void kmemleak_load_module(const struct module *mod,
2404 const struct load_info *info)
2408 /* only scan the sections containing data */
2409 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
2411 for (i = 1; i < info->hdr->e_shnum; i++) {
2412 const char *name = info->secstrings + info->sechdrs[i].sh_name;
2413 if (!(info->sechdrs[i].sh_flags & SHF_ALLOC))
2415 if (!strstarts(name, ".data") && !strstarts(name, ".bss"))
2418 kmemleak_scan_area((void *)info->sechdrs[i].sh_addr,
2419 info->sechdrs[i].sh_size, GFP_KERNEL);
2423 static inline void kmemleak_load_module(const struct module *mod,
2424 const struct load_info *info)
2429 #ifdef CONFIG_MODULE_SIG
2430 static int module_sig_check(struct load_info *info)
2433 const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1;
2434 const void *mod = info->hdr;
2436 if (info->len > markerlen &&
2437 memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) {
2438 /* We truncate the module to discard the signature */
2439 info->len -= markerlen;
2440 err = mod_verify_sig(mod, &info->len);
2444 info->sig_ok = true;
2448 /* Not having a signature is only an error if we're strict. */
2449 if (err < 0 && fips_enabled)
2450 panic("Module verification failed with error %d in FIPS mode\n",
2452 if (err == -ENOKEY && !sig_enforce)
2457 #else /* !CONFIG_MODULE_SIG */
2458 static int module_sig_check(struct load_info *info)
2462 #endif /* !CONFIG_MODULE_SIG */
2464 /* Sanity checks against invalid binaries, wrong arch, weird elf version. */
2465 static int elf_header_check(struct load_info *info)
2467 if (info->len < sizeof(*(info->hdr)))
2470 if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0
2471 || info->hdr->e_type != ET_REL
2472 || !elf_check_arch(info->hdr)
2473 || info->hdr->e_shentsize != sizeof(Elf_Shdr))
2476 if (info->hdr->e_shoff >= info->len
2477 || (info->hdr->e_shnum * sizeof(Elf_Shdr) >
2478 info->len - info->hdr->e_shoff))
2484 /* Sets info->hdr and info->len. */
2485 static int copy_module_from_user(const void __user *umod, unsigned long len,
2486 struct load_info *info)
2489 if (info->len < sizeof(*(info->hdr)))
2492 /* Suck in entire file: we'll want most of it. */
2493 info->hdr = vmalloc(info->len);
2497 if (copy_from_user(info->hdr, umod, info->len) != 0) {
2505 /* Sets info->hdr and info->len. */
2506 static int copy_module_from_fd(int fd, struct load_info *info)
2518 err = vfs_getattr(file->f_vfsmnt, file->f_dentry, &stat);
2522 if (stat.size > INT_MAX) {
2526 info->hdr = vmalloc(stat.size);
2533 while (pos < stat.size) {
2534 bytes = kernel_read(file, pos, (char *)(info->hdr) + pos,
2552 static void free_copy(struct load_info *info)
2557 static int rewrite_section_headers(struct load_info *info, int flags)
2561 /* This should always be true, but let's be sure. */
2562 info->sechdrs[0].sh_addr = 0;
2564 for (i = 1; i < info->hdr->e_shnum; i++) {
2565 Elf_Shdr *shdr = &info->sechdrs[i];
2566 if (shdr->sh_type != SHT_NOBITS
2567 && info->len < shdr->sh_offset + shdr->sh_size) {
2568 printk(KERN_ERR "Module len %lu truncated\n",
2573 /* Mark all sections sh_addr with their address in the
2575 shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset;
2577 #ifndef CONFIG_MODULE_UNLOAD
2578 /* Don't load .exit sections */
2579 if (strstarts(info->secstrings+shdr->sh_name, ".exit"))
2580 shdr->sh_flags &= ~(unsigned long)SHF_ALLOC;
2584 /* Track but don't keep modinfo and version sections. */
2585 if (flags & MODULE_INIT_IGNORE_MODVERSIONS)
2586 info->index.vers = 0; /* Pretend no __versions section! */
2588 info->index.vers = find_sec(info, "__versions");
2589 info->index.info = find_sec(info, ".modinfo");
2590 info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC;
2591 info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC;
2596 * Set up our basic convenience variables (pointers to section headers,
2597 * search for module section index etc), and do some basic section
2600 * Return the temporary module pointer (we'll replace it with the final
2601 * one when we move the module sections around).
2603 static struct module *setup_load_info(struct load_info *info, int flags)
2609 /* Set up the convenience variables */
2610 info->sechdrs = (void *)info->hdr + info->hdr->e_shoff;
2611 info->secstrings = (void *)info->hdr
2612 + info->sechdrs[info->hdr->e_shstrndx].sh_offset;
2614 err = rewrite_section_headers(info, flags);
2616 return ERR_PTR(err);
2618 /* Find internal symbols and strings. */
2619 for (i = 1; i < info->hdr->e_shnum; i++) {
2620 if (info->sechdrs[i].sh_type == SHT_SYMTAB) {
2621 info->index.sym = i;
2622 info->index.str = info->sechdrs[i].sh_link;
2623 info->strtab = (char *)info->hdr
2624 + info->sechdrs[info->index.str].sh_offset;
2629 info->index.mod = find_sec(info, ".gnu.linkonce.this_module");
2630 if (!info->index.mod) {
2631 printk(KERN_WARNING "No module found in object\n");
2632 return ERR_PTR(-ENOEXEC);
2634 /* This is temporary: point mod into copy of data. */
2635 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
2637 if (info->index.sym == 0) {
2638 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2640 return ERR_PTR(-ENOEXEC);
2643 info->index.pcpu = find_pcpusec(info);
2645 /* Check module struct version now, before we try to use module. */
2646 if (!check_modstruct_version(info->sechdrs, info->index.vers, mod))
2647 return ERR_PTR(-ENOEXEC);
2652 static int check_modinfo(struct module *mod, struct load_info *info, int flags)
2654 const char *modmagic = get_modinfo(info, "vermagic");
2657 if (flags & MODULE_INIT_IGNORE_VERMAGIC)
2660 /* This is allowed: modprobe --force will invalidate it. */
2662 err = try_to_force_load(mod, "bad vermagic");
2665 } else if (!same_magic(modmagic, vermagic, info->index.vers)) {
2666 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2667 mod->name, modmagic, vermagic);
2671 if (!get_modinfo(info, "intree"))
2672 add_taint_module(mod, TAINT_OOT_MODULE);
2674 if (get_modinfo(info, "staging")) {
2675 add_taint_module(mod, TAINT_CRAP);
2676 printk(KERN_WARNING "%s: module is from the staging directory,"
2677 " the quality is unknown, you have been warned.\n",
2681 /* Set up license info based on the info section */
2682 set_license(mod, get_modinfo(info, "license"));
2687 static void find_module_sections(struct module *mod, struct load_info *info)
2689 mod->kp = section_objs(info, "__param",
2690 sizeof(*mod->kp), &mod->num_kp);
2691 mod->syms = section_objs(info, "__ksymtab",
2692 sizeof(*mod->syms), &mod->num_syms);
2693 mod->crcs = section_addr(info, "__kcrctab");
2694 mod->gpl_syms = section_objs(info, "__ksymtab_gpl",
2695 sizeof(*mod->gpl_syms),
2696 &mod->num_gpl_syms);
2697 mod->gpl_crcs = section_addr(info, "__kcrctab_gpl");
2698 mod->gpl_future_syms = section_objs(info,
2699 "__ksymtab_gpl_future",
2700 sizeof(*mod->gpl_future_syms),
2701 &mod->num_gpl_future_syms);
2702 mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future");
2704 #ifdef CONFIG_UNUSED_SYMBOLS
2705 mod->unused_syms = section_objs(info, "__ksymtab_unused",
2706 sizeof(*mod->unused_syms),
2707 &mod->num_unused_syms);
2708 mod->unused_crcs = section_addr(info, "__kcrctab_unused");
2709 mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl",
2710 sizeof(*mod->unused_gpl_syms),
2711 &mod->num_unused_gpl_syms);
2712 mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl");
2714 #ifdef CONFIG_CONSTRUCTORS
2715 mod->ctors = section_objs(info, ".ctors",
2716 sizeof(*mod->ctors), &mod->num_ctors);
2719 #ifdef CONFIG_TRACEPOINTS
2720 mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs",
2721 sizeof(*mod->tracepoints_ptrs),
2722 &mod->num_tracepoints);
2724 #ifdef HAVE_JUMP_LABEL
2725 mod->jump_entries = section_objs(info, "__jump_table",
2726 sizeof(*mod->jump_entries),
2727 &mod->num_jump_entries);
2729 #ifdef CONFIG_EVENT_TRACING
2730 mod->trace_events = section_objs(info, "_ftrace_events",
2731 sizeof(*mod->trace_events),
2732 &mod->num_trace_events);
2734 * This section contains pointers to allocated objects in the trace
2735 * code and not scanning it leads to false positives.
2737 kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
2738 mod->num_trace_events, GFP_KERNEL);
2740 #ifdef CONFIG_TRACING
2741 mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt",
2742 sizeof(*mod->trace_bprintk_fmt_start),
2743 &mod->num_trace_bprintk_fmt);
2745 * This section contains pointers to allocated objects in the trace
2746 * code and not scanning it leads to false positives.
2748 kmemleak_scan_area(mod->trace_bprintk_fmt_start,
2749 sizeof(*mod->trace_bprintk_fmt_start) *
2750 mod->num_trace_bprintk_fmt, GFP_KERNEL);
2752 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2753 /* sechdrs[0].sh_size is always zero */
2754 mod->ftrace_callsites = section_objs(info, "__mcount_loc",
2755 sizeof(*mod->ftrace_callsites),
2756 &mod->num_ftrace_callsites);
2759 mod->extable = section_objs(info, "__ex_table",
2760 sizeof(*mod->extable), &mod->num_exentries);
2762 if (section_addr(info, "__obsparm"))
2763 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2766 info->debug = section_objs(info, "__verbose",
2767 sizeof(*info->debug), &info->num_debug);
2770 static int move_module(struct module *mod, struct load_info *info)
2775 /* Do the allocs. */
2776 ptr = module_alloc_update_bounds(mod->core_size);
2778 * The pointer to this block is stored in the module structure
2779 * which is inside the block. Just mark it as not being a
2782 kmemleak_not_leak(ptr);
2786 memset(ptr, 0, mod->core_size);
2787 mod->module_core = ptr;
2789 ptr = module_alloc_update_bounds(mod->init_size);
2791 * The pointer to this block is stored in the module structure
2792 * which is inside the block. This block doesn't need to be
2793 * scanned as it contains data and code that will be freed
2794 * after the module is initialized.
2796 kmemleak_ignore(ptr);
2797 if (!ptr && mod->init_size) {
2798 module_free(mod, mod->module_core);
2801 memset(ptr, 0, mod->init_size);
2802 mod->module_init = ptr;
2804 /* Transfer each section which specifies SHF_ALLOC */
2805 pr_debug("final section addresses:\n");
2806 for (i = 0; i < info->hdr->e_shnum; i++) {
2808 Elf_Shdr *shdr = &info->sechdrs[i];
2810 if (!(shdr->sh_flags & SHF_ALLOC))
2813 if (shdr->sh_entsize & INIT_OFFSET_MASK)
2814 dest = mod->module_init
2815 + (shdr->sh_entsize & ~INIT_OFFSET_MASK);
2817 dest = mod->module_core + shdr->sh_entsize;
2819 if (shdr->sh_type != SHT_NOBITS)
2820 memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size);
2821 /* Update sh_addr to point to copy in image. */
2822 shdr->sh_addr = (unsigned long)dest;
2823 pr_debug("\t0x%lx %s\n",
2824 (long)shdr->sh_addr, info->secstrings + shdr->sh_name);
2830 static int check_module_license_and_versions(struct module *mod)
2833 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2834 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2835 * using GPL-only symbols it needs.
2837 if (strcmp(mod->name, "ndiswrapper") == 0)
2838 add_taint(TAINT_PROPRIETARY_MODULE);
2840 /* driverloader was caught wrongly pretending to be under GPL */
2841 if (strcmp(mod->name, "driverloader") == 0)
2842 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2844 /* lve claims to be GPL but upstream won't provide source */
2845 if (strcmp(mod->name, "lve") == 0)
2846 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2848 #ifdef CONFIG_MODVERSIONS
2849 if ((mod->num_syms && !mod->crcs)
2850 || (mod->num_gpl_syms && !mod->gpl_crcs)
2851 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2852 #ifdef CONFIG_UNUSED_SYMBOLS
2853 || (mod->num_unused_syms && !mod->unused_crcs)
2854 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2857 return try_to_force_load(mod,
2858 "no versions for exported symbols");
2864 static void flush_module_icache(const struct module *mod)
2866 mm_segment_t old_fs;
2868 /* flush the icache in correct context */
2873 * Flush the instruction cache, since we've played with text.
2874 * Do it before processing of module parameters, so the module
2875 * can provide parameter accessor functions of its own.
2877 if (mod->module_init)
2878 flush_icache_range((unsigned long)mod->module_init,
2879 (unsigned long)mod->module_init
2881 flush_icache_range((unsigned long)mod->module_core,
2882 (unsigned long)mod->module_core + mod->core_size);
2887 int __weak module_frob_arch_sections(Elf_Ehdr *hdr,
2895 static struct module *layout_and_allocate(struct load_info *info, int flags)
2897 /* Module within temporary copy. */
2902 mod = setup_load_info(info, flags);
2906 err = check_modinfo(mod, info, flags);
2908 return ERR_PTR(err);
2910 /* Allow arches to frob section contents and sizes. */
2911 err = module_frob_arch_sections(info->hdr, info->sechdrs,
2912 info->secstrings, mod);
2916 pcpusec = &info->sechdrs[info->index.pcpu];
2917 if (pcpusec->sh_size) {
2918 /* We have a special allocation for this section. */
2919 err = percpu_modalloc(mod,
2920 pcpusec->sh_size, pcpusec->sh_addralign);
2923 pcpusec->sh_flags &= ~(unsigned long)SHF_ALLOC;
2926 /* Determine total sizes, and put offsets in sh_entsize. For now
2927 this is done generically; there doesn't appear to be any
2928 special cases for the architectures. */
2929 layout_sections(mod, info);
2930 layout_symtab(mod, info);
2932 /* Allocate and move to the final place */
2933 err = move_module(mod, info);
2937 /* Module has been copied to its final place now: return it. */
2938 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
2939 kmemleak_load_module(mod, info);
2943 percpu_modfree(mod);
2945 return ERR_PTR(err);
2948 /* mod is no longer valid after this! */
2949 static void module_deallocate(struct module *mod, struct load_info *info)
2951 percpu_modfree(mod);
2952 module_free(mod, mod->module_init);
2953 module_free(mod, mod->module_core);
2956 int __weak module_finalize(const Elf_Ehdr *hdr,
2957 const Elf_Shdr *sechdrs,
2963 static int post_relocation(struct module *mod, const struct load_info *info)
2965 /* Sort exception table now relocations are done. */
2966 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2968 /* Copy relocated percpu area over. */
2969 percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr,
2970 info->sechdrs[info->index.pcpu].sh_size);
2972 /* Setup kallsyms-specific fields. */
2973 add_kallsyms(mod, info);
2975 /* Arch-specific module finalizing. */
2976 return module_finalize(info->hdr, info->sechdrs, mod);
2979 /* Is this module of this name done loading? No locks held. */
2980 static bool finished_loading(const char *name)
2985 mutex_lock(&module_mutex);
2986 mod = find_module(name);
2987 ret = !mod || mod->state != MODULE_STATE_COMING;
2988 mutex_unlock(&module_mutex);
2993 /* Call module constructors. */
2994 static void do_mod_ctors(struct module *mod)
2996 #ifdef CONFIG_CONSTRUCTORS
2999 for (i = 0; i < mod->num_ctors; i++)
3004 /* This is where the real work happens */
3005 static int do_init_module(struct module *mod)
3009 blocking_notifier_call_chain(&module_notify_list,
3010 MODULE_STATE_COMING, mod);
3012 /* Set RO and NX regions for core */
3013 set_section_ro_nx(mod->module_core,
3014 mod->core_text_size,
3018 /* Set RO and NX regions for init */
3019 set_section_ro_nx(mod->module_init,
3020 mod->init_text_size,
3025 /* Start the module */
3026 if (mod->init != NULL)
3027 ret = do_one_initcall(mod->init);
3029 /* Init routine failed: abort. Try to protect us from
3030 buggy refcounters. */
3031 mod->state = MODULE_STATE_GOING;
3032 synchronize_sched();
3034 blocking_notifier_call_chain(&module_notify_list,
3035 MODULE_STATE_GOING, mod);
3037 wake_up_all(&module_wq);
3042 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
3043 "%s: loading module anyway...\n",
3044 __func__, mod->name, ret,
3049 /* Now it's a first class citizen! */
3050 mod->state = MODULE_STATE_LIVE;
3051 blocking_notifier_call_chain(&module_notify_list,
3052 MODULE_STATE_LIVE, mod);
3054 /* We need to finish all async code before the module init sequence is done */
3055 async_synchronize_full();
3057 mutex_lock(&module_mutex);
3058 /* Drop initial reference. */
3060 trim_init_extable(mod);
3061 #ifdef CONFIG_KALLSYMS
3062 mod->num_symtab = mod->core_num_syms;
3063 mod->symtab = mod->core_symtab;
3064 mod->strtab = mod->core_strtab;
3066 unset_module_init_ro_nx(mod);
3067 module_free(mod, mod->module_init);
3068 mod->module_init = NULL;
3070 mod->init_ro_size = 0;
3071 mod->init_text_size = 0;
3072 mutex_unlock(&module_mutex);
3073 wake_up_all(&module_wq);
3078 static int may_init_module(void)
3080 if (!capable(CAP_SYS_MODULE) || modules_disabled)
3086 /* Allocate and load the module: note that size of section 0 is always
3087 zero, and we rely on this for optional sections. */
3088 static int load_module(struct load_info *info, const char __user *uargs,
3091 struct module *mod, *old;
3094 err = module_sig_check(info);
3098 err = elf_header_check(info);
3102 /* Figure out module layout, and allocate all the memory. */
3103 mod = layout_and_allocate(info, flags);
3109 #ifdef CONFIG_MODULE_SIG
3110 mod->sig_ok = info->sig_ok;
3112 add_taint_module(mod, TAINT_FORCED_MODULE);
3115 /* Now module is in final location, initialize linked lists, etc. */
3116 err = module_unload_init(mod);
3120 /* Now we've got everything in the final locations, we can
3121 * find optional sections. */
3122 find_module_sections(mod, info);
3124 err = check_module_license_and_versions(mod);
3128 /* Set up MODINFO_ATTR fields */
3129 setup_modinfo(mod, info);
3131 /* Fix up syms, so that st_value is a pointer to location. */
3132 err = simplify_symbols(mod, info);
3136 err = apply_relocations(mod, info);
3140 err = post_relocation(mod, info);
3144 flush_module_icache(mod);
3146 /* Now copy in args */
3147 mod->args = strndup_user(uargs, ~0UL >> 1);
3148 if (IS_ERR(mod->args)) {
3149 err = PTR_ERR(mod->args);
3150 goto free_arch_cleanup;
3153 /* Mark state as coming so strong_try_module_get() ignores us. */
3154 mod->state = MODULE_STATE_COMING;
3156 /* Now sew it into the lists so we can get lockdep and oops
3157 * info during argument parsing. No one should access us, since
3158 * strong_try_module_get() will fail.
3159 * lockdep/oops can run asynchronous, so use the RCU list insertion
3160 * function to insert in a way safe to concurrent readers.
3161 * The mutex protects against concurrent writers.
3164 mutex_lock(&module_mutex);
3165 if ((old = find_module(mod->name)) != NULL) {
3166 if (old->state == MODULE_STATE_COMING) {
3167 /* Wait in case it fails to load. */
3168 mutex_unlock(&module_mutex);
3169 err = wait_event_interruptible(module_wq,
3170 finished_loading(mod->name));
3172 goto free_arch_cleanup;
3179 /* This has to be done once we're sure module name is unique. */
3180 dynamic_debug_setup(info->debug, info->num_debug);
3182 /* Find duplicate symbols */
3183 err = verify_export_symbols(mod);
3187 module_bug_finalize(info->hdr, info->sechdrs, mod);
3188 list_add_rcu(&mod->list, &modules);
3189 mutex_unlock(&module_mutex);
3191 /* Module is ready to execute: parsing args may do that. */
3192 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp,
3193 -32768, 32767, &ddebug_dyndbg_module_param_cb);
3197 /* Link in to syfs. */
3198 err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp);
3202 /* Get rid of temporary copy. */
3206 trace_module_load(mod);
3208 return do_init_module(mod);
3211 mutex_lock(&module_mutex);
3212 /* Unlink carefully: kallsyms could be walking list. */
3213 list_del_rcu(&mod->list);
3214 module_bug_cleanup(mod);
3215 wake_up_all(&module_wq);
3217 dynamic_debug_remove(info->debug);
3219 mutex_unlock(&module_mutex);
3220 synchronize_sched();
3223 module_arch_cleanup(mod);
3227 module_unload_free(mod);
3229 module_deallocate(mod, info);
3235 SYSCALL_DEFINE3(init_module, void __user *, umod,
3236 unsigned long, len, const char __user *, uargs)
3239 struct load_info info = { };
3241 err = may_init_module();
3245 pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
3248 err = copy_module_from_user(umod, len, &info);
3252 return load_module(&info, uargs, 0);
3255 SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags)
3258 struct load_info info = { };
3260 err = may_init_module();
3264 pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags);
3266 if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS
3267 |MODULE_INIT_IGNORE_VERMAGIC))
3270 err = copy_module_from_fd(fd, &info);
3274 return load_module(&info, uargs, flags);
3277 static inline int within(unsigned long addr, void *start, unsigned long size)
3279 return ((void *)addr >= start && (void *)addr < start + size);
3282 #ifdef CONFIG_KALLSYMS
3284 * This ignores the intensely annoying "mapping symbols" found
3285 * in ARM ELF files: $a, $t and $d.
3287 static inline int is_arm_mapping_symbol(const char *str)
3289 return str[0] == '$' && strchr("atd", str[1])
3290 && (str[2] == '\0' || str[2] == '.');
3293 static const char *get_ksymbol(struct module *mod,
3295 unsigned long *size,
3296 unsigned long *offset)
3298 unsigned int i, best = 0;
3299 unsigned long nextval;
3301 /* At worse, next value is at end of module */
3302 if (within_module_init(addr, mod))
3303 nextval = (unsigned long)mod->module_init+mod->init_text_size;
3305 nextval = (unsigned long)mod->module_core+mod->core_text_size;
3307 /* Scan for closest preceding symbol, and next symbol. (ELF
3308 starts real symbols at 1). */
3309 for (i = 1; i < mod->num_symtab; i++) {
3310 if (mod->symtab[i].st_shndx == SHN_UNDEF)
3313 /* We ignore unnamed symbols: they're uninformative
3314 * and inserted at a whim. */
3315 if (mod->symtab[i].st_value <= addr
3316 && mod->symtab[i].st_value > mod->symtab[best].st_value
3317 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
3318 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
3320 if (mod->symtab[i].st_value > addr
3321 && mod->symtab[i].st_value < nextval
3322 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
3323 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
3324 nextval = mod->symtab[i].st_value;
3331 *size = nextval - mod->symtab[best].st_value;
3333 *offset = addr - mod->symtab[best].st_value;
3334 return mod->strtab + mod->symtab[best].st_name;
3337 /* For kallsyms to ask for address resolution. NULL means not found. Careful
3338 * not to lock to avoid deadlock on oopses, simply disable preemption. */
3339 const char *module_address_lookup(unsigned long addr,
3340 unsigned long *size,
3341 unsigned long *offset,
3346 const char *ret = NULL;
3349 list_for_each_entry_rcu(mod, &modules, list) {
3350 if (within_module_init(addr, mod) ||
3351 within_module_core(addr, mod)) {
3353 *modname = mod->name;
3354 ret = get_ksymbol(mod, addr, size, offset);
3358 /* Make a copy in here where it's safe */
3360 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
3367 int lookup_module_symbol_name(unsigned long addr, char *symname)
3372 list_for_each_entry_rcu(mod, &modules, list) {
3373 if (within_module_init(addr, mod) ||
3374 within_module_core(addr, mod)) {
3377 sym = get_ksymbol(mod, addr, NULL, NULL);
3380 strlcpy(symname, sym, KSYM_NAME_LEN);
3390 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
3391 unsigned long *offset, char *modname, char *name)
3396 list_for_each_entry_rcu(mod, &modules, list) {
3397 if (within_module_init(addr, mod) ||
3398 within_module_core(addr, mod)) {
3401 sym = get_ksymbol(mod, addr, size, offset);
3405 strlcpy(modname, mod->name, MODULE_NAME_LEN);
3407 strlcpy(name, sym, KSYM_NAME_LEN);
3417 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
3418 char *name, char *module_name, int *exported)
3423 list_for_each_entry_rcu(mod, &modules, list) {
3424 if (symnum < mod->num_symtab) {
3425 *value = mod->symtab[symnum].st_value;
3426 *type = mod->symtab[symnum].st_info;
3427 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
3429 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
3430 *exported = is_exported(name, *value, mod);
3434 symnum -= mod->num_symtab;
3440 static unsigned long mod_find_symname(struct module *mod, const char *name)
3444 for (i = 0; i < mod->num_symtab; i++)
3445 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
3446 mod->symtab[i].st_info != 'U')
3447 return mod->symtab[i].st_value;
3451 /* Look for this name: can be of form module:name. */
3452 unsigned long module_kallsyms_lookup_name(const char *name)
3456 unsigned long ret = 0;
3458 /* Don't lock: we're in enough trouble already. */
3460 if ((colon = strchr(name, ':')) != NULL) {
3462 if ((mod = find_module(name)) != NULL)
3463 ret = mod_find_symname(mod, colon+1);
3466 list_for_each_entry_rcu(mod, &modules, list)
3467 if ((ret = mod_find_symname(mod, name)) != 0)
3474 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
3475 struct module *, unsigned long),
3482 list_for_each_entry(mod, &modules, list) {
3483 for (i = 0; i < mod->num_symtab; i++) {
3484 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
3485 mod, mod->symtab[i].st_value);
3492 #endif /* CONFIG_KALLSYMS */
3494 static char *module_flags(struct module *mod, char *buf)
3499 mod->state == MODULE_STATE_GOING ||
3500 mod->state == MODULE_STATE_COMING) {
3502 bx += module_flags_taint(mod, buf + bx);
3503 /* Show a - for module-is-being-unloaded */
3504 if (mod->state == MODULE_STATE_GOING)
3506 /* Show a + for module-is-being-loaded */
3507 if (mod->state == MODULE_STATE_COMING)
3516 #ifdef CONFIG_PROC_FS
3517 /* Called by the /proc file system to return a list of modules. */
3518 static void *m_start(struct seq_file *m, loff_t *pos)
3520 mutex_lock(&module_mutex);
3521 return seq_list_start(&modules, *pos);
3524 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
3526 return seq_list_next(p, &modules, pos);
3529 static void m_stop(struct seq_file *m, void *p)
3531 mutex_unlock(&module_mutex);
3534 static int m_show(struct seq_file *m, void *p)
3536 struct module *mod = list_entry(p, struct module, list);
3539 seq_printf(m, "%s %u",
3540 mod->name, mod->init_size + mod->core_size);
3541 print_unload_info(m, mod);
3543 /* Informative for users. */
3544 seq_printf(m, " %s",
3545 mod->state == MODULE_STATE_GOING ? "Unloading":
3546 mod->state == MODULE_STATE_COMING ? "Loading":
3548 /* Used by oprofile and other similar tools. */
3549 seq_printf(m, " 0x%pK", mod->module_core);
3553 seq_printf(m, " %s", module_flags(mod, buf));
3555 seq_printf(m, "\n");
3559 /* Format: modulename size refcount deps address
3561 Where refcount is a number or -, and deps is a comma-separated list
3564 static const struct seq_operations modules_op = {
3571 static int modules_open(struct inode *inode, struct file *file)
3573 return seq_open(file, &modules_op);
3576 static const struct file_operations proc_modules_operations = {
3577 .open = modules_open,
3579 .llseek = seq_lseek,
3580 .release = seq_release,
3583 static int __init proc_modules_init(void)
3585 proc_create("modules", 0, NULL, &proc_modules_operations);
3588 module_init(proc_modules_init);
3591 /* Given an address, look for it in the module exception tables. */
3592 const struct exception_table_entry *search_module_extables(unsigned long addr)
3594 const struct exception_table_entry *e = NULL;
3598 list_for_each_entry_rcu(mod, &modules, list) {
3599 if (mod->num_exentries == 0)
3602 e = search_extable(mod->extable,
3603 mod->extable + mod->num_exentries - 1,
3610 /* Now, if we found one, we are running inside it now, hence
3611 we cannot unload the module, hence no refcnt needed. */
3616 * is_module_address - is this address inside a module?
3617 * @addr: the address to check.
3619 * See is_module_text_address() if you simply want to see if the address
3620 * is code (not data).
3622 bool is_module_address(unsigned long addr)
3627 ret = __module_address(addr) != NULL;
3634 * __module_address - get the module which contains an address.
3635 * @addr: the address.
3637 * Must be called with preempt disabled or module mutex held so that
3638 * module doesn't get freed during this.
3640 struct module *__module_address(unsigned long addr)
3644 if (addr < module_addr_min || addr > module_addr_max)
3647 list_for_each_entry_rcu(mod, &modules, list)
3648 if (within_module_core(addr, mod)
3649 || within_module_init(addr, mod))
3653 EXPORT_SYMBOL_GPL(__module_address);
3656 * is_module_text_address - is this address inside module code?
3657 * @addr: the address to check.
3659 * See is_module_address() if you simply want to see if the address is
3660 * anywhere in a module. See kernel_text_address() for testing if an
3661 * address corresponds to kernel or module code.
3663 bool is_module_text_address(unsigned long addr)
3668 ret = __module_text_address(addr) != NULL;
3675 * __module_text_address - get the module whose code contains an address.
3676 * @addr: the address.
3678 * Must be called with preempt disabled or module mutex held so that
3679 * module doesn't get freed during this.
3681 struct module *__module_text_address(unsigned long addr)
3683 struct module *mod = __module_address(addr);
3685 /* Make sure it's within the text section. */
3686 if (!within(addr, mod->module_init, mod->init_text_size)
3687 && !within(addr, mod->module_core, mod->core_text_size))
3692 EXPORT_SYMBOL_GPL(__module_text_address);
3694 /* Don't grab lock, we're oopsing. */
3695 void print_modules(void)
3700 printk(KERN_DEFAULT "Modules linked in:");
3701 /* Most callers should already have preempt disabled, but make sure */
3703 list_for_each_entry_rcu(mod, &modules, list)
3704 printk(" %s%s", mod->name, module_flags(mod, buf));
3706 if (last_unloaded_module[0])
3707 printk(" [last unloaded: %s]", last_unloaded_module);
3711 #ifdef CONFIG_MODVERSIONS
3712 /* Generate the signature for all relevant module structures here.
3713 * If these change, we don't want to try to parse the module. */
3714 void module_layout(struct module *mod,
3715 struct modversion_info *ver,
3716 struct kernel_param *kp,
3717 struct kernel_symbol *ks,
3718 struct tracepoint * const *tp)
3721 EXPORT_SYMBOL(module_layout);