2 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002 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/module.h>
20 #include <linux/moduleloader.h>
21 #include <linux/init.h>
22 #include <linux/kallsyms.h>
23 #include <linux/sysfs.h>
24 #include <linux/kernel.h>
25 #include <linux/slab.h>
26 #include <linux/vmalloc.h>
27 #include <linux/elf.h>
28 #include <linux/seq_file.h>
29 #include <linux/syscalls.h>
30 #include <linux/fcntl.h>
31 #include <linux/rcupdate.h>
32 #include <linux/capability.h>
33 #include <linux/cpu.h>
34 #include <linux/moduleparam.h>
35 #include <linux/errno.h>
36 #include <linux/err.h>
37 #include <linux/vermagic.h>
38 #include <linux/notifier.h>
39 #include <linux/sched.h>
40 #include <linux/stop_machine.h>
41 #include <linux/device.h>
42 #include <linux/string.h>
43 #include <linux/mutex.h>
44 #include <linux/unwind.h>
45 #include <asm/uaccess.h>
46 #include <asm/cacheflush.h>
47 #include <linux/license.h>
48 #include <asm/sections.h>
49 #include <linux/tracepoint.h>
54 #define DEBUGP(fmt , a...)
57 #ifndef ARCH_SHF_SMALL
58 #define ARCH_SHF_SMALL 0
61 /* If this is set, the section belongs in the init part of the module */
62 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
64 /* List of modules, protected by module_mutex or preempt_disable
65 * (add/delete uses stop_machine). */
66 static DEFINE_MUTEX(module_mutex);
67 static LIST_HEAD(modules);
69 /* Waiting for a module to finish initializing? */
70 static DECLARE_WAIT_QUEUE_HEAD(module_wq);
72 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
74 /* Bounds of module allocation, for speeding __module_text_address */
75 static unsigned long module_addr_min = -1UL, module_addr_max = 0;
77 int register_module_notifier(struct notifier_block * nb)
79 return blocking_notifier_chain_register(&module_notify_list, nb);
81 EXPORT_SYMBOL(register_module_notifier);
83 int unregister_module_notifier(struct notifier_block * nb)
85 return blocking_notifier_chain_unregister(&module_notify_list, nb);
87 EXPORT_SYMBOL(unregister_module_notifier);
89 /* We require a truly strong try_module_get(): 0 means failure due to
90 ongoing or failed initialization etc. */
91 static inline int strong_try_module_get(struct module *mod)
93 if (mod && mod->state == MODULE_STATE_COMING)
95 if (try_module_get(mod))
101 static inline void add_taint_module(struct module *mod, unsigned flag)
108 * A thread that wants to hold a reference to a module only while it
109 * is running can call this to safely exit. nfsd and lockd use this.
111 void __module_put_and_exit(struct module *mod, long code)
116 EXPORT_SYMBOL(__module_put_and_exit);
118 /* Find a module section: 0 means not found. */
119 static unsigned int find_sec(Elf_Ehdr *hdr,
121 const char *secstrings,
126 for (i = 1; i < hdr->e_shnum; i++)
127 /* Alloc bit cleared means "ignore it." */
128 if ((sechdrs[i].sh_flags & SHF_ALLOC)
129 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
134 /* Provided by the linker */
135 extern const struct kernel_symbol __start___ksymtab[];
136 extern const struct kernel_symbol __stop___ksymtab[];
137 extern const struct kernel_symbol __start___ksymtab_gpl[];
138 extern const struct kernel_symbol __stop___ksymtab_gpl[];
139 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
140 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
141 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
142 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
143 extern const unsigned long __start___kcrctab[];
144 extern const unsigned long __start___kcrctab_gpl[];
145 extern const unsigned long __start___kcrctab_gpl_future[];
146 #ifdef CONFIG_UNUSED_SYMBOLS
147 extern const struct kernel_symbol __start___ksymtab_unused[];
148 extern const struct kernel_symbol __stop___ksymtab_unused[];
149 extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
150 extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
151 extern const unsigned long __start___kcrctab_unused[];
152 extern const unsigned long __start___kcrctab_unused_gpl[];
155 #ifndef CONFIG_MODVERSIONS
156 #define symversion(base, idx) NULL
158 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
162 const struct kernel_symbol *start, *stop;
163 const unsigned long *crcs;
172 static bool each_symbol_in_section(const struct symsearch *arr,
173 unsigned int arrsize,
174 struct module *owner,
175 bool (*fn)(const struct symsearch *syms,
176 struct module *owner,
177 unsigned int symnum, void *data),
182 for (j = 0; j < arrsize; j++) {
183 for (i = 0; i < arr[j].stop - arr[j].start; i++)
184 if (fn(&arr[j], owner, i, data))
191 /* Returns true as soon as fn returns true, otherwise false. */
192 static bool each_symbol(bool (*fn)(const struct symsearch *arr,
193 struct module *owner,
194 unsigned int symnum, void *data),
198 const struct symsearch arr[] = {
199 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
200 NOT_GPL_ONLY, false },
201 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
202 __start___kcrctab_gpl,
204 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
205 __start___kcrctab_gpl_future,
206 WILL_BE_GPL_ONLY, false },
207 #ifdef CONFIG_UNUSED_SYMBOLS
208 { __start___ksymtab_unused, __stop___ksymtab_unused,
209 __start___kcrctab_unused,
210 NOT_GPL_ONLY, true },
211 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
212 __start___kcrctab_unused_gpl,
217 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
220 list_for_each_entry(mod, &modules, list) {
221 struct symsearch arr[] = {
222 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
223 NOT_GPL_ONLY, false },
224 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
227 { mod->gpl_future_syms,
228 mod->gpl_future_syms + mod->num_gpl_future_syms,
229 mod->gpl_future_crcs,
230 WILL_BE_GPL_ONLY, false },
231 #ifdef CONFIG_UNUSED_SYMBOLS
233 mod->unused_syms + mod->num_unused_syms,
235 NOT_GPL_ONLY, true },
236 { mod->unused_gpl_syms,
237 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
238 mod->unused_gpl_crcs,
243 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
249 struct find_symbol_arg {
256 struct module *owner;
257 const unsigned long *crc;
261 static bool find_symbol_in_section(const struct symsearch *syms,
262 struct module *owner,
263 unsigned int symnum, void *data)
265 struct find_symbol_arg *fsa = data;
267 if (strcmp(syms->start[symnum].name, fsa->name) != 0)
271 if (syms->licence == GPL_ONLY)
273 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
274 printk(KERN_WARNING "Symbol %s is being used "
275 "by a non-GPL module, which will not "
276 "be allowed in the future\n", fsa->name);
277 printk(KERN_WARNING "Please see the file "
278 "Documentation/feature-removal-schedule.txt "
279 "in the kernel source tree for more details.\n");
283 #ifdef CONFIG_UNUSED_SYMBOLS
284 if (syms->unused && fsa->warn) {
285 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
286 "however this module is using it.\n", fsa->name);
288 "This symbol will go away in the future.\n");
290 "Please evalute if this is the right api to use and if "
291 "it really is, submit a report the linux kernel "
292 "mailinglist together with submitting your code for "
298 fsa->crc = symversion(syms->crcs, symnum);
299 fsa->value = syms->start[symnum].value;
303 /* Find a symbol, return value, (optional) crc and (optional) module
305 static unsigned long find_symbol(const char *name,
306 struct module **owner,
307 const unsigned long **crc,
311 struct find_symbol_arg fsa;
317 if (each_symbol(find_symbol_in_section, &fsa)) {
325 DEBUGP("Failed to find symbol %s\n", name);
329 /* Search for module by name: must hold module_mutex. */
330 static struct module *find_module(const char *name)
334 list_for_each_entry(mod, &modules, list) {
335 if (strcmp(mod->name, name) == 0)
342 /* Number of blocks used and allocated. */
343 static unsigned int pcpu_num_used, pcpu_num_allocated;
344 /* Size of each block. -ve means used. */
345 static int *pcpu_size;
347 static int split_block(unsigned int i, unsigned short size)
349 /* Reallocation required? */
350 if (pcpu_num_used + 1 > pcpu_num_allocated) {
353 new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2,
358 pcpu_num_allocated *= 2;
362 /* Insert a new subblock */
363 memmove(&pcpu_size[i+1], &pcpu_size[i],
364 sizeof(pcpu_size[0]) * (pcpu_num_used - i));
367 pcpu_size[i+1] -= size;
372 static inline unsigned int block_size(int val)
379 static void *percpu_modalloc(unsigned long size, unsigned long align,
386 if (align > PAGE_SIZE) {
387 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
388 name, align, PAGE_SIZE);
392 ptr = __per_cpu_start;
393 for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
394 /* Extra for alignment requirement. */
395 extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
396 BUG_ON(i == 0 && extra != 0);
398 if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
401 /* Transfer extra to previous block. */
402 if (pcpu_size[i-1] < 0)
403 pcpu_size[i-1] -= extra;
405 pcpu_size[i-1] += extra;
406 pcpu_size[i] -= extra;
409 /* Split block if warranted */
410 if (pcpu_size[i] - size > sizeof(unsigned long))
411 if (!split_block(i, size))
415 pcpu_size[i] = -pcpu_size[i];
419 printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
424 static void percpu_modfree(void *freeme)
427 void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
429 /* First entry is core kernel percpu data. */
430 for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
432 pcpu_size[i] = -pcpu_size[i];
439 /* Merge with previous? */
440 if (pcpu_size[i-1] >= 0) {
441 pcpu_size[i-1] += pcpu_size[i];
443 memmove(&pcpu_size[i], &pcpu_size[i+1],
444 (pcpu_num_used - i) * sizeof(pcpu_size[0]));
447 /* Merge with next? */
448 if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
449 pcpu_size[i] += pcpu_size[i+1];
451 memmove(&pcpu_size[i+1], &pcpu_size[i+2],
452 (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
456 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
458 const char *secstrings)
460 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
463 static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
467 for_each_possible_cpu(cpu)
468 memcpy(pcpudest + per_cpu_offset(cpu), from, size);
471 static int percpu_modinit(void)
474 pcpu_num_allocated = 2;
475 pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
477 /* Static in-kernel percpu data (used). */
478 pcpu_size[0] = -(__per_cpu_end-__per_cpu_start);
480 pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
481 if (pcpu_size[1] < 0) {
482 printk(KERN_ERR "No per-cpu room for modules.\n");
488 __initcall(percpu_modinit);
489 #else /* ... !CONFIG_SMP */
490 static inline void *percpu_modalloc(unsigned long size, unsigned long align,
495 static inline void percpu_modfree(void *pcpuptr)
499 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
501 const char *secstrings)
505 static inline void percpu_modcopy(void *pcpudst, const void *src,
508 /* pcpusec should be 0, and size of that section should be 0. */
511 #endif /* CONFIG_SMP */
513 #define MODINFO_ATTR(field) \
514 static void setup_modinfo_##field(struct module *mod, const char *s) \
516 mod->field = kstrdup(s, GFP_KERNEL); \
518 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
519 struct module *mod, char *buffer) \
521 return sprintf(buffer, "%s\n", mod->field); \
523 static int modinfo_##field##_exists(struct module *mod) \
525 return mod->field != NULL; \
527 static void free_modinfo_##field(struct module *mod) \
532 static struct module_attribute modinfo_##field = { \
533 .attr = { .name = __stringify(field), .mode = 0444 }, \
534 .show = show_modinfo_##field, \
535 .setup = setup_modinfo_##field, \
536 .test = modinfo_##field##_exists, \
537 .free = free_modinfo_##field, \
540 MODINFO_ATTR(version);
541 MODINFO_ATTR(srcversion);
543 static char last_unloaded_module[MODULE_NAME_LEN+1];
545 #ifdef CONFIG_MODULE_UNLOAD
546 /* Init the unload section of the module. */
547 static void module_unload_init(struct module *mod)
551 INIT_LIST_HEAD(&mod->modules_which_use_me);
552 for (i = 0; i < NR_CPUS; i++)
553 local_set(&mod->ref[i].count, 0);
554 /* Hold reference count during initialization. */
555 local_set(&mod->ref[raw_smp_processor_id()].count, 1);
556 /* Backwards compatibility macros put refcount during init. */
557 mod->waiter = current;
560 /* modules using other modules */
563 struct list_head list;
564 struct module *module_which_uses;
567 /* Does a already use b? */
568 static int already_uses(struct module *a, struct module *b)
570 struct module_use *use;
572 list_for_each_entry(use, &b->modules_which_use_me, list) {
573 if (use->module_which_uses == a) {
574 DEBUGP("%s uses %s!\n", a->name, b->name);
578 DEBUGP("%s does not use %s!\n", a->name, b->name);
582 /* Module a uses b */
583 static int use_module(struct module *a, struct module *b)
585 struct module_use *use;
588 if (b == NULL || already_uses(a, b)) return 1;
590 /* If we're interrupted or time out, we fail. */
591 if (wait_event_interruptible_timeout(
592 module_wq, (err = strong_try_module_get(b)) != -EBUSY,
594 printk("%s: gave up waiting for init of module %s.\n",
599 /* If strong_try_module_get() returned a different error, we fail. */
603 DEBUGP("Allocating new usage for %s.\n", a->name);
604 use = kmalloc(sizeof(*use), GFP_ATOMIC);
606 printk("%s: out of memory loading\n", a->name);
611 use->module_which_uses = a;
612 list_add(&use->list, &b->modules_which_use_me);
613 no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
617 /* Clear the unload stuff of the module. */
618 static void module_unload_free(struct module *mod)
622 list_for_each_entry(i, &modules, list) {
623 struct module_use *use;
625 list_for_each_entry(use, &i->modules_which_use_me, list) {
626 if (use->module_which_uses == mod) {
627 DEBUGP("%s unusing %s\n", mod->name, i->name);
629 list_del(&use->list);
631 sysfs_remove_link(i->holders_dir, mod->name);
632 /* There can be at most one match. */
639 #ifdef CONFIG_MODULE_FORCE_UNLOAD
640 static inline int try_force_unload(unsigned int flags)
642 int ret = (flags & O_TRUNC);
644 add_taint(TAINT_FORCED_RMMOD);
648 static inline int try_force_unload(unsigned int flags)
652 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
661 /* Whole machine is stopped with interrupts off when this runs. */
662 static int __try_stop_module(void *_sref)
664 struct stopref *sref = _sref;
666 /* If it's not unused, quit unless we're forcing. */
667 if (module_refcount(sref->mod) != 0) {
668 if (!(*sref->forced = try_force_unload(sref->flags)))
672 /* Mark it as dying. */
673 sref->mod->state = MODULE_STATE_GOING;
677 static int try_stop_module(struct module *mod, int flags, int *forced)
679 if (flags & O_NONBLOCK) {
680 struct stopref sref = { mod, flags, forced };
682 return stop_machine(__try_stop_module, &sref, NULL);
684 /* We don't need to stop the machine for this. */
685 mod->state = MODULE_STATE_GOING;
691 unsigned int module_refcount(struct module *mod)
693 unsigned int i, total = 0;
695 for (i = 0; i < NR_CPUS; i++)
696 total += local_read(&mod->ref[i].count);
699 EXPORT_SYMBOL(module_refcount);
701 /* This exists whether we can unload or not */
702 static void free_module(struct module *mod);
704 static void wait_for_zero_refcount(struct module *mod)
706 /* Since we might sleep for some time, release the mutex first */
707 mutex_unlock(&module_mutex);
709 DEBUGP("Looking at refcount...\n");
710 set_current_state(TASK_UNINTERRUPTIBLE);
711 if (module_refcount(mod) == 0)
715 current->state = TASK_RUNNING;
716 mutex_lock(&module_mutex);
720 sys_delete_module(const char __user *name_user, unsigned int flags)
723 char name[MODULE_NAME_LEN];
726 if (!capable(CAP_SYS_MODULE))
729 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
731 name[MODULE_NAME_LEN-1] = '\0';
733 if (mutex_lock_interruptible(&module_mutex) != 0)
736 mod = find_module(name);
742 if (!list_empty(&mod->modules_which_use_me)) {
743 /* Other modules depend on us: get rid of them first. */
748 /* Doing init or already dying? */
749 if (mod->state != MODULE_STATE_LIVE) {
750 /* FIXME: if (force), slam module count and wake up
752 DEBUGP("%s already dying\n", mod->name);
757 /* If it has an init func, it must have an exit func to unload */
758 if (mod->init && !mod->exit) {
759 forced = try_force_unload(flags);
761 /* This module can't be removed */
767 /* Set this up before setting mod->state */
768 mod->waiter = current;
770 /* Stop the machine so refcounts can't move and disable module. */
771 ret = try_stop_module(mod, flags, &forced);
775 /* Never wait if forced. */
776 if (!forced && module_refcount(mod) != 0)
777 wait_for_zero_refcount(mod);
779 mutex_unlock(&module_mutex);
780 /* Final destruction now noone is using it. */
781 if (mod->exit != NULL)
783 blocking_notifier_call_chain(&module_notify_list,
784 MODULE_STATE_GOING, mod);
785 mutex_lock(&module_mutex);
786 /* Store the name of the last unloaded module for diagnostic purposes */
787 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
791 mutex_unlock(&module_mutex);
795 static void print_unload_info(struct seq_file *m, struct module *mod)
797 struct module_use *use;
798 int printed_something = 0;
800 seq_printf(m, " %u ", module_refcount(mod));
802 /* Always include a trailing , so userspace can differentiate
803 between this and the old multi-field proc format. */
804 list_for_each_entry(use, &mod->modules_which_use_me, list) {
805 printed_something = 1;
806 seq_printf(m, "%s,", use->module_which_uses->name);
809 if (mod->init != NULL && mod->exit == NULL) {
810 printed_something = 1;
811 seq_printf(m, "[permanent],");
814 if (!printed_something)
818 void __symbol_put(const char *symbol)
820 struct module *owner;
823 if (IS_ERR_VALUE(find_symbol(symbol, &owner, NULL, true, false)))
828 EXPORT_SYMBOL(__symbol_put);
830 void symbol_put_addr(void *addr)
832 struct module *modaddr;
834 if (core_kernel_text((unsigned long)addr))
837 if (!(modaddr = module_text_address((unsigned long)addr)))
841 EXPORT_SYMBOL_GPL(symbol_put_addr);
843 static ssize_t show_refcnt(struct module_attribute *mattr,
844 struct module *mod, char *buffer)
846 return sprintf(buffer, "%u\n", module_refcount(mod));
849 static struct module_attribute refcnt = {
850 .attr = { .name = "refcnt", .mode = 0444 },
854 void module_put(struct module *module)
857 unsigned int cpu = get_cpu();
858 local_dec(&module->ref[cpu].count);
859 /* Maybe they're waiting for us to drop reference? */
860 if (unlikely(!module_is_live(module)))
861 wake_up_process(module->waiter);
865 EXPORT_SYMBOL(module_put);
867 #else /* !CONFIG_MODULE_UNLOAD */
868 static void print_unload_info(struct seq_file *m, struct module *mod)
870 /* We don't know the usage count, or what modules are using. */
871 seq_printf(m, " - -");
874 static inline void module_unload_free(struct module *mod)
878 static inline int use_module(struct module *a, struct module *b)
880 return strong_try_module_get(b) == 0;
883 static inline void module_unload_init(struct module *mod)
886 #endif /* CONFIG_MODULE_UNLOAD */
888 static ssize_t show_initstate(struct module_attribute *mattr,
889 struct module *mod, char *buffer)
891 const char *state = "unknown";
893 switch (mod->state) {
894 case MODULE_STATE_LIVE:
897 case MODULE_STATE_COMING:
900 case MODULE_STATE_GOING:
904 return sprintf(buffer, "%s\n", state);
907 static struct module_attribute initstate = {
908 .attr = { .name = "initstate", .mode = 0444 },
909 .show = show_initstate,
912 static struct module_attribute *modinfo_attrs[] = {
916 #ifdef CONFIG_MODULE_UNLOAD
922 static const char vermagic[] = VERMAGIC_STRING;
924 static int try_to_force_load(struct module *mod, const char *symname)
926 #ifdef CONFIG_MODULE_FORCE_LOAD
927 if (!(tainted & TAINT_FORCED_MODULE))
928 printk("%s: no version for \"%s\" found: kernel tainted.\n",
930 add_taint_module(mod, TAINT_FORCED_MODULE);
937 #ifdef CONFIG_MODVERSIONS
938 static int check_version(Elf_Shdr *sechdrs,
939 unsigned int versindex,
942 const unsigned long *crc)
944 unsigned int i, num_versions;
945 struct modversion_info *versions;
947 /* Exporting module didn't supply crcs? OK, we're already tainted. */
951 /* No versions at all? modprobe --force does this. */
953 return try_to_force_load(mod, symname) == 0;
955 versions = (void *) sechdrs[versindex].sh_addr;
956 num_versions = sechdrs[versindex].sh_size
957 / sizeof(struct modversion_info);
959 for (i = 0; i < num_versions; i++) {
960 if (strcmp(versions[i].name, symname) != 0)
963 if (versions[i].crc == *crc)
965 DEBUGP("Found checksum %lX vs module %lX\n",
966 *crc, versions[i].crc);
970 printk(KERN_WARNING "%s: no symbol version for %s\n",
975 printk("%s: disagrees about version of symbol %s\n",
980 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
981 unsigned int versindex,
984 const unsigned long *crc;
986 if (IS_ERR_VALUE(find_symbol("struct_module", NULL, &crc, true, false)))
988 return check_version(sechdrs, versindex, "struct_module", mod, crc);
991 /* First part is kernel version, which we ignore if module has crcs. */
992 static inline int same_magic(const char *amagic, const char *bmagic,
996 amagic += strcspn(amagic, " ");
997 bmagic += strcspn(bmagic, " ");
999 return strcmp(amagic, bmagic) == 0;
1002 static inline int check_version(Elf_Shdr *sechdrs,
1003 unsigned int versindex,
1004 const char *symname,
1006 const unsigned long *crc)
1011 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1012 unsigned int versindex,
1018 static inline int same_magic(const char *amagic, const char *bmagic,
1021 return strcmp(amagic, bmagic) == 0;
1023 #endif /* CONFIG_MODVERSIONS */
1025 /* Resolve a symbol for this module. I.e. if we find one, record usage.
1026 Must be holding module_mutex. */
1027 static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
1028 unsigned int versindex,
1032 struct module *owner;
1034 const unsigned long *crc;
1036 ret = find_symbol(name, &owner, &crc,
1037 !(mod->taints & TAINT_PROPRIETARY_MODULE), true);
1038 if (!IS_ERR_VALUE(ret)) {
1039 /* use_module can fail due to OOM,
1040 or module initialization or unloading */
1041 if (!check_version(sechdrs, versindex, name, mod, crc) ||
1042 !use_module(mod, owner))
1049 * /sys/module/foo/sections stuff
1050 * J. Corbet <corbet@lwn.net>
1052 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1053 struct module_sect_attr
1055 struct module_attribute mattr;
1057 unsigned long address;
1060 struct module_sect_attrs
1062 struct attribute_group grp;
1063 unsigned int nsections;
1064 struct module_sect_attr attrs[0];
1067 static ssize_t module_sect_show(struct module_attribute *mattr,
1068 struct module *mod, char *buf)
1070 struct module_sect_attr *sattr =
1071 container_of(mattr, struct module_sect_attr, mattr);
1072 return sprintf(buf, "0x%lx\n", sattr->address);
1075 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1077 unsigned int section;
1079 for (section = 0; section < sect_attrs->nsections; section++)
1080 kfree(sect_attrs->attrs[section].name);
1084 static void add_sect_attrs(struct module *mod, unsigned int nsect,
1085 char *secstrings, Elf_Shdr *sechdrs)
1087 unsigned int nloaded = 0, i, size[2];
1088 struct module_sect_attrs *sect_attrs;
1089 struct module_sect_attr *sattr;
1090 struct attribute **gattr;
1092 /* Count loaded sections and allocate structures */
1093 for (i = 0; i < nsect; i++)
1094 if (sechdrs[i].sh_flags & SHF_ALLOC)
1096 size[0] = ALIGN(sizeof(*sect_attrs)
1097 + nloaded * sizeof(sect_attrs->attrs[0]),
1098 sizeof(sect_attrs->grp.attrs[0]));
1099 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1100 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1101 if (sect_attrs == NULL)
1104 /* Setup section attributes. */
1105 sect_attrs->grp.name = "sections";
1106 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1108 sect_attrs->nsections = 0;
1109 sattr = §_attrs->attrs[0];
1110 gattr = §_attrs->grp.attrs[0];
1111 for (i = 0; i < nsect; i++) {
1112 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
1114 sattr->address = sechdrs[i].sh_addr;
1115 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1117 if (sattr->name == NULL)
1119 sect_attrs->nsections++;
1120 sattr->mattr.show = module_sect_show;
1121 sattr->mattr.store = NULL;
1122 sattr->mattr.attr.name = sattr->name;
1123 sattr->mattr.attr.mode = S_IRUGO;
1124 *(gattr++) = &(sattr++)->mattr.attr;
1128 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1131 mod->sect_attrs = sect_attrs;
1134 free_sect_attrs(sect_attrs);
1137 static void remove_sect_attrs(struct module *mod)
1139 if (mod->sect_attrs) {
1140 sysfs_remove_group(&mod->mkobj.kobj,
1141 &mod->sect_attrs->grp);
1142 /* We are positive that no one is using any sect attrs
1143 * at this point. Deallocate immediately. */
1144 free_sect_attrs(mod->sect_attrs);
1145 mod->sect_attrs = NULL;
1150 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1153 struct module_notes_attrs {
1154 struct kobject *dir;
1156 struct bin_attribute attrs[0];
1159 static ssize_t module_notes_read(struct kobject *kobj,
1160 struct bin_attribute *bin_attr,
1161 char *buf, loff_t pos, size_t count)
1164 * The caller checked the pos and count against our size.
1166 memcpy(buf, bin_attr->private + pos, count);
1170 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1173 if (notes_attrs->dir) {
1175 sysfs_remove_bin_file(notes_attrs->dir,
1176 ¬es_attrs->attrs[i]);
1177 kobject_del(notes_attrs->dir);
1182 static void add_notes_attrs(struct module *mod, unsigned int nsect,
1183 char *secstrings, Elf_Shdr *sechdrs)
1185 unsigned int notes, loaded, i;
1186 struct module_notes_attrs *notes_attrs;
1187 struct bin_attribute *nattr;
1189 /* Count notes sections and allocate structures. */
1191 for (i = 0; i < nsect; i++)
1192 if ((sechdrs[i].sh_flags & SHF_ALLOC) &&
1193 (sechdrs[i].sh_type == SHT_NOTE))
1199 notes_attrs = kzalloc(sizeof(*notes_attrs)
1200 + notes * sizeof(notes_attrs->attrs[0]),
1202 if (notes_attrs == NULL)
1205 notes_attrs->notes = notes;
1206 nattr = ¬es_attrs->attrs[0];
1207 for (loaded = i = 0; i < nsect; ++i) {
1208 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1210 if (sechdrs[i].sh_type == SHT_NOTE) {
1211 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1212 nattr->attr.mode = S_IRUGO;
1213 nattr->size = sechdrs[i].sh_size;
1214 nattr->private = (void *) sechdrs[i].sh_addr;
1215 nattr->read = module_notes_read;
1221 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1222 if (!notes_attrs->dir)
1225 for (i = 0; i < notes; ++i)
1226 if (sysfs_create_bin_file(notes_attrs->dir,
1227 ¬es_attrs->attrs[i]))
1230 mod->notes_attrs = notes_attrs;
1234 free_notes_attrs(notes_attrs, i);
1237 static void remove_notes_attrs(struct module *mod)
1239 if (mod->notes_attrs)
1240 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1245 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1246 char *sectstrings, Elf_Shdr *sechdrs)
1250 static inline void remove_sect_attrs(struct module *mod)
1254 static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1255 char *sectstrings, Elf_Shdr *sechdrs)
1259 static inline void remove_notes_attrs(struct module *mod)
1265 int module_add_modinfo_attrs(struct module *mod)
1267 struct module_attribute *attr;
1268 struct module_attribute *temp_attr;
1272 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1273 (ARRAY_SIZE(modinfo_attrs) + 1)),
1275 if (!mod->modinfo_attrs)
1278 temp_attr = mod->modinfo_attrs;
1279 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1281 (attr->test && attr->test(mod))) {
1282 memcpy(temp_attr, attr, sizeof(*temp_attr));
1283 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1290 void module_remove_modinfo_attrs(struct module *mod)
1292 struct module_attribute *attr;
1295 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1296 /* pick a field to test for end of list */
1297 if (!attr->attr.name)
1299 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1303 kfree(mod->modinfo_attrs);
1306 int mod_sysfs_init(struct module *mod)
1309 struct kobject *kobj;
1311 if (!module_sysfs_initialized) {
1312 printk(KERN_ERR "%s: module sysfs not initialized\n",
1318 kobj = kset_find_obj(module_kset, mod->name);
1320 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1326 mod->mkobj.mod = mod;
1328 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1329 mod->mkobj.kobj.kset = module_kset;
1330 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1333 kobject_put(&mod->mkobj.kobj);
1335 /* delay uevent until full sysfs population */
1340 int mod_sysfs_setup(struct module *mod,
1341 struct kernel_param *kparam,
1342 unsigned int num_params)
1346 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1347 if (!mod->holders_dir) {
1352 err = module_param_sysfs_setup(mod, kparam, num_params);
1354 goto out_unreg_holders;
1356 err = module_add_modinfo_attrs(mod);
1358 goto out_unreg_param;
1360 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1364 module_param_sysfs_remove(mod);
1366 kobject_put(mod->holders_dir);
1368 kobject_put(&mod->mkobj.kobj);
1372 static void mod_sysfs_fini(struct module *mod)
1374 kobject_put(&mod->mkobj.kobj);
1377 #else /* CONFIG_SYSFS */
1379 static void mod_sysfs_fini(struct module *mod)
1383 #endif /* CONFIG_SYSFS */
1385 static void mod_kobject_remove(struct module *mod)
1387 module_remove_modinfo_attrs(mod);
1388 module_param_sysfs_remove(mod);
1389 kobject_put(mod->mkobj.drivers_dir);
1390 kobject_put(mod->holders_dir);
1391 mod_sysfs_fini(mod);
1395 * link the module with the whole machine is stopped with interrupts off
1396 * - this defends against kallsyms not taking locks
1398 static int __link_module(void *_mod)
1400 struct module *mod = _mod;
1401 list_add(&mod->list, &modules);
1406 * unlink the module with the whole machine is stopped with interrupts off
1407 * - this defends against kallsyms not taking locks
1409 static int __unlink_module(void *_mod)
1411 struct module *mod = _mod;
1412 list_del(&mod->list);
1416 /* Free a module, remove from lists, etc (must hold module_mutex). */
1417 static void free_module(struct module *mod)
1419 /* Delete from various lists */
1420 stop_machine(__unlink_module, mod, NULL);
1421 remove_notes_attrs(mod);
1422 remove_sect_attrs(mod);
1423 mod_kobject_remove(mod);
1425 unwind_remove_table(mod->unwind_info, 0);
1427 /* Arch-specific cleanup. */
1428 module_arch_cleanup(mod);
1430 /* Module unload stuff */
1431 module_unload_free(mod);
1433 /* This may be NULL, but that's OK */
1434 module_free(mod, mod->module_init);
1437 percpu_modfree(mod->percpu);
1439 /* Free lock-classes: */
1440 lockdep_free_key_range(mod->module_core, mod->core_size);
1442 /* Finally, free the core (containing the module structure) */
1443 module_free(mod, mod->module_core);
1446 void *__symbol_get(const char *symbol)
1448 struct module *owner;
1449 unsigned long value;
1452 value = find_symbol(symbol, &owner, NULL, true, true);
1453 if (IS_ERR_VALUE(value))
1455 else if (strong_try_module_get(owner))
1459 return (void *)value;
1461 EXPORT_SYMBOL_GPL(__symbol_get);
1464 * Ensure that an exported symbol [global namespace] does not already exist
1465 * in the kernel or in some other module's exported symbol table.
1467 static int verify_export_symbols(struct module *mod)
1470 struct module *owner;
1471 const struct kernel_symbol *s;
1473 const struct kernel_symbol *sym;
1476 { mod->syms, mod->num_syms },
1477 { mod->gpl_syms, mod->num_gpl_syms },
1478 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1479 #ifdef CONFIG_UNUSED_SYMBOLS
1480 { mod->unused_syms, mod->num_unused_syms },
1481 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1485 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1486 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1487 if (!IS_ERR_VALUE(find_symbol(s->name, &owner,
1488 NULL, true, false))) {
1490 "%s: exports duplicate symbol %s"
1492 mod->name, s->name, module_name(owner));
1500 /* Change all symbols so that st_value encodes the pointer directly. */
1501 static int simplify_symbols(Elf_Shdr *sechdrs,
1502 unsigned int symindex,
1504 unsigned int versindex,
1505 unsigned int pcpuindex,
1508 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1509 unsigned long secbase;
1510 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1513 for (i = 1; i < n; i++) {
1514 switch (sym[i].st_shndx) {
1516 /* We compiled with -fno-common. These are not
1517 supposed to happen. */
1518 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1519 printk("%s: please compile with -fno-common\n",
1525 /* Don't need to do anything */
1526 DEBUGP("Absolute symbol: 0x%08lx\n",
1527 (long)sym[i].st_value);
1532 = resolve_symbol(sechdrs, versindex,
1533 strtab + sym[i].st_name, mod);
1535 /* Ok if resolved. */
1536 if (!IS_ERR_VALUE(sym[i].st_value))
1539 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1542 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1543 mod->name, strtab + sym[i].st_name);
1548 /* Divert to percpu allocation if a percpu var. */
1549 if (sym[i].st_shndx == pcpuindex)
1550 secbase = (unsigned long)mod->percpu;
1552 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1553 sym[i].st_value += secbase;
1561 /* Update size with this section: return offset. */
1562 static long get_offset(unsigned int *size, Elf_Shdr *sechdr)
1566 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1567 *size = ret + sechdr->sh_size;
1571 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1572 might -- code, read-only data, read-write data, small data. Tally
1573 sizes, and place the offsets into sh_entsize fields: high bit means it
1575 static void layout_sections(struct module *mod,
1576 const Elf_Ehdr *hdr,
1578 const char *secstrings)
1580 static unsigned long const masks[][2] = {
1581 /* NOTE: all executable code must be the first section
1582 * in this array; otherwise modify the text_size
1583 * finder in the two loops below */
1584 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1585 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1586 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1587 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1591 for (i = 0; i < hdr->e_shnum; i++)
1592 sechdrs[i].sh_entsize = ~0UL;
1594 DEBUGP("Core section allocation order:\n");
1595 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1596 for (i = 0; i < hdr->e_shnum; ++i) {
1597 Elf_Shdr *s = &sechdrs[i];
1599 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1600 || (s->sh_flags & masks[m][1])
1601 || s->sh_entsize != ~0UL
1602 || strncmp(secstrings + s->sh_name,
1605 s->sh_entsize = get_offset(&mod->core_size, s);
1606 DEBUGP("\t%s\n", secstrings + s->sh_name);
1609 mod->core_text_size = mod->core_size;
1612 DEBUGP("Init section allocation order:\n");
1613 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1614 for (i = 0; i < hdr->e_shnum; ++i) {
1615 Elf_Shdr *s = &sechdrs[i];
1617 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1618 || (s->sh_flags & masks[m][1])
1619 || s->sh_entsize != ~0UL
1620 || strncmp(secstrings + s->sh_name,
1623 s->sh_entsize = (get_offset(&mod->init_size, s)
1624 | INIT_OFFSET_MASK);
1625 DEBUGP("\t%s\n", secstrings + s->sh_name);
1628 mod->init_text_size = mod->init_size;
1632 static void set_license(struct module *mod, const char *license)
1635 license = "unspecified";
1637 if (!license_is_gpl_compatible(license)) {
1638 if (!(tainted & TAINT_PROPRIETARY_MODULE))
1639 printk(KERN_WARNING "%s: module license '%s' taints "
1640 "kernel.\n", mod->name, license);
1641 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1645 /* Parse tag=value strings from .modinfo section */
1646 static char *next_string(char *string, unsigned long *secsize)
1648 /* Skip non-zero chars */
1651 if ((*secsize)-- <= 1)
1655 /* Skip any zero padding. */
1656 while (!string[0]) {
1658 if ((*secsize)-- <= 1)
1664 static char *get_modinfo(Elf_Shdr *sechdrs,
1669 unsigned int taglen = strlen(tag);
1670 unsigned long size = sechdrs[info].sh_size;
1672 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1673 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1674 return p + taglen + 1;
1679 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1680 unsigned int infoindex)
1682 struct module_attribute *attr;
1685 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1688 get_modinfo(sechdrs,
1694 #ifdef CONFIG_KALLSYMS
1696 /* lookup symbol in given range of kernel_symbols */
1697 static const struct kernel_symbol *lookup_symbol(const char *name,
1698 const struct kernel_symbol *start,
1699 const struct kernel_symbol *stop)
1701 const struct kernel_symbol *ks = start;
1702 for (; ks < stop; ks++)
1703 if (strcmp(ks->name, name) == 0)
1708 static int is_exported(const char *name, const struct module *mod)
1710 if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab))
1713 if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms))
1720 static char elf_type(const Elf_Sym *sym,
1722 const char *secstrings,
1725 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1726 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1731 if (sym->st_shndx == SHN_UNDEF)
1733 if (sym->st_shndx == SHN_ABS)
1735 if (sym->st_shndx >= SHN_LORESERVE)
1737 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1739 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1740 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1741 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1743 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1748 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1749 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1754 if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name,
1755 ".debug", strlen(".debug")) == 0)
1760 static void add_kallsyms(struct module *mod,
1762 unsigned int symindex,
1763 unsigned int strindex,
1764 const char *secstrings)
1768 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1769 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1770 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1772 /* Set types up while we still have access to sections. */
1773 for (i = 0; i < mod->num_symtab; i++)
1774 mod->symtab[i].st_info
1775 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1778 static inline void add_kallsyms(struct module *mod,
1780 unsigned int symindex,
1781 unsigned int strindex,
1782 const char *secstrings)
1785 #endif /* CONFIG_KALLSYMS */
1787 static void *module_alloc_update_bounds(unsigned long size)
1789 void *ret = module_alloc(size);
1792 /* Update module bounds. */
1793 if ((unsigned long)ret < module_addr_min)
1794 module_addr_min = (unsigned long)ret;
1795 if ((unsigned long)ret + size > module_addr_max)
1796 module_addr_max = (unsigned long)ret + size;
1801 /* Allocate and load the module: note that size of section 0 is always
1802 zero, and we rely on this for optional sections. */
1803 static noinline struct module *load_module(void __user *umod,
1805 const char __user *uargs)
1809 char *secstrings, *args, *modmagic, *strtab = NULL;
1811 unsigned int symindex = 0;
1812 unsigned int strindex = 0;
1813 unsigned int setupindex;
1814 unsigned int exindex;
1815 unsigned int exportindex;
1816 unsigned int modindex;
1817 unsigned int obsparmindex;
1818 unsigned int infoindex;
1819 unsigned int gplindex;
1820 unsigned int crcindex;
1821 unsigned int gplcrcindex;
1822 unsigned int versindex;
1823 unsigned int pcpuindex;
1824 unsigned int gplfutureindex;
1825 unsigned int gplfuturecrcindex;
1826 unsigned int unwindex = 0;
1827 #ifdef CONFIG_UNUSED_SYMBOLS
1828 unsigned int unusedindex;
1829 unsigned int unusedcrcindex;
1830 unsigned int unusedgplindex;
1831 unsigned int unusedgplcrcindex;
1833 unsigned int markersindex;
1834 unsigned int markersstringsindex;
1835 unsigned int tracepointsindex;
1836 unsigned int tracepointsstringsindex;
1839 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1840 struct exception_table_entry *extable;
1841 mm_segment_t old_fs;
1843 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1845 if (len < sizeof(*hdr))
1846 return ERR_PTR(-ENOEXEC);
1848 /* Suck in entire file: we'll want most of it. */
1849 /* vmalloc barfs on "unusual" numbers. Check here */
1850 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1851 return ERR_PTR(-ENOMEM);
1852 if (copy_from_user(hdr, umod, len) != 0) {
1857 /* Sanity checks against insmoding binaries or wrong arch,
1858 weird elf version */
1859 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
1860 || hdr->e_type != ET_REL
1861 || !elf_check_arch(hdr)
1862 || hdr->e_shentsize != sizeof(*sechdrs)) {
1867 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1870 /* Convenience variables */
1871 sechdrs = (void *)hdr + hdr->e_shoff;
1872 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1873 sechdrs[0].sh_addr = 0;
1875 for (i = 1; i < hdr->e_shnum; i++) {
1876 if (sechdrs[i].sh_type != SHT_NOBITS
1877 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1880 /* Mark all sections sh_addr with their address in the
1882 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1884 /* Internal symbols and strings. */
1885 if (sechdrs[i].sh_type == SHT_SYMTAB) {
1887 strindex = sechdrs[i].sh_link;
1888 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
1890 #ifndef CONFIG_MODULE_UNLOAD
1891 /* Don't load .exit sections */
1892 if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
1893 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1897 modindex = find_sec(hdr, sechdrs, secstrings,
1898 ".gnu.linkonce.this_module");
1900 printk(KERN_WARNING "No module found in object\n");
1904 mod = (void *)sechdrs[modindex].sh_addr;
1906 if (symindex == 0) {
1907 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
1913 /* Optional sections */
1914 exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab");
1915 gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl");
1916 gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future");
1917 crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab");
1918 gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl");
1919 gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future");
1920 #ifdef CONFIG_UNUSED_SYMBOLS
1921 unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused");
1922 unusedgplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl");
1923 unusedcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused");
1924 unusedgplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl");
1926 setupindex = find_sec(hdr, sechdrs, secstrings, "__param");
1927 exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table");
1928 obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm");
1929 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
1930 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
1931 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
1932 #ifdef ARCH_UNWIND_SECTION_NAME
1933 unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
1936 /* Don't keep modinfo and version sections. */
1937 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1938 sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1939 #ifdef CONFIG_KALLSYMS
1940 /* Keep symbol and string tables for decoding later. */
1941 sechdrs[symindex].sh_flags |= SHF_ALLOC;
1942 sechdrs[strindex].sh_flags |= SHF_ALLOC;
1945 sechdrs[unwindex].sh_flags |= SHF_ALLOC;
1947 /* Check module struct version now, before we try to use module. */
1948 if (!check_modstruct_version(sechdrs, versindex, mod)) {
1953 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
1954 /* This is allowed: modprobe --force will invalidate it. */
1956 err = try_to_force_load(mod, "magic");
1959 } else if (!same_magic(modmagic, vermagic, versindex)) {
1960 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
1961 mod->name, modmagic, vermagic);
1966 /* Now copy in args */
1967 args = strndup_user(uargs, ~0UL >> 1);
1969 err = PTR_ERR(args);
1973 if (find_module(mod->name)) {
1978 mod->state = MODULE_STATE_COMING;
1980 /* Allow arches to frob section contents and sizes. */
1981 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
1986 /* We have a special allocation for this section. */
1987 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
1988 sechdrs[pcpuindex].sh_addralign,
1994 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
1995 mod->percpu = percpu;
1998 /* Determine total sizes, and put offsets in sh_entsize. For now
1999 this is done generically; there doesn't appear to be any
2000 special cases for the architectures. */
2001 layout_sections(mod, hdr, sechdrs, secstrings);
2003 /* Do the allocs. */
2004 ptr = module_alloc_update_bounds(mod->core_size);
2009 memset(ptr, 0, mod->core_size);
2010 mod->module_core = ptr;
2012 ptr = module_alloc_update_bounds(mod->init_size);
2013 if (!ptr && mod->init_size) {
2017 memset(ptr, 0, mod->init_size);
2018 mod->module_init = ptr;
2020 /* Transfer each section which specifies SHF_ALLOC */
2021 DEBUGP("final section addresses:\n");
2022 for (i = 0; i < hdr->e_shnum; i++) {
2025 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2028 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
2029 dest = mod->module_init
2030 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
2032 dest = mod->module_core + sechdrs[i].sh_entsize;
2034 if (sechdrs[i].sh_type != SHT_NOBITS)
2035 memcpy(dest, (void *)sechdrs[i].sh_addr,
2036 sechdrs[i].sh_size);
2037 /* Update sh_addr to point to copy in image. */
2038 sechdrs[i].sh_addr = (unsigned long)dest;
2039 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
2041 /* Module has been moved. */
2042 mod = (void *)sechdrs[modindex].sh_addr;
2044 /* Now we've moved module, initialize linked lists, etc. */
2045 module_unload_init(mod);
2047 /* add kobject, so we can reference it. */
2048 err = mod_sysfs_init(mod);
2052 /* Set up license info based on the info section */
2053 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
2056 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2057 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2058 * using GPL-only symbols it needs.
2060 if (strcmp(mod->name, "ndiswrapper") == 0)
2061 add_taint(TAINT_PROPRIETARY_MODULE);
2063 /* driverloader was caught wrongly pretending to be under GPL */
2064 if (strcmp(mod->name, "driverloader") == 0)
2065 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2067 /* Set up MODINFO_ATTR fields */
2068 setup_modinfo(mod, sechdrs, infoindex);
2070 /* Fix up syms, so that st_value is a pointer to location. */
2071 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
2076 /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
2077 mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms);
2078 mod->syms = (void *)sechdrs[exportindex].sh_addr;
2080 mod->crcs = (void *)sechdrs[crcindex].sh_addr;
2081 mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms);
2082 mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr;
2084 mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr;
2085 mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size /
2086 sizeof(*mod->gpl_future_syms);
2087 mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr;
2088 if (gplfuturecrcindex)
2089 mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr;
2091 #ifdef CONFIG_UNUSED_SYMBOLS
2092 mod->num_unused_syms = sechdrs[unusedindex].sh_size /
2093 sizeof(*mod->unused_syms);
2094 mod->num_unused_gpl_syms = sechdrs[unusedgplindex].sh_size /
2095 sizeof(*mod->unused_gpl_syms);
2096 mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr;
2098 mod->unused_crcs = (void *)sechdrs[unusedcrcindex].sh_addr;
2099 mod->unused_gpl_syms = (void *)sechdrs[unusedgplindex].sh_addr;
2100 if (unusedgplcrcindex)
2101 mod->unused_gpl_crcs
2102 = (void *)sechdrs[unusedgplcrcindex].sh_addr;
2105 #ifdef CONFIG_MODVERSIONS
2106 if ((mod->num_syms && !crcindex)
2107 || (mod->num_gpl_syms && !gplcrcindex)
2108 || (mod->num_gpl_future_syms && !gplfuturecrcindex)
2109 #ifdef CONFIG_UNUSED_SYMBOLS
2110 || (mod->num_unused_syms && !unusedcrcindex)
2111 || (mod->num_unused_gpl_syms && !unusedgplcrcindex)
2114 printk(KERN_WARNING "%s: No versions for exported symbols.\n", mod->name);
2115 err = try_to_force_load(mod, "nocrc");
2120 markersindex = find_sec(hdr, sechdrs, secstrings, "__markers");
2121 markersstringsindex = find_sec(hdr, sechdrs, secstrings,
2122 "__markers_strings");
2123 tracepointsindex = find_sec(hdr, sechdrs, secstrings, "__tracepoints");
2124 tracepointsstringsindex = find_sec(hdr, sechdrs, secstrings,
2125 "__tracepoints_strings");
2127 /* Now do relocations. */
2128 for (i = 1; i < hdr->e_shnum; i++) {
2129 const char *strtab = (char *)sechdrs[strindex].sh_addr;
2130 unsigned int info = sechdrs[i].sh_info;
2132 /* Not a valid relocation section? */
2133 if (info >= hdr->e_shnum)
2136 /* Don't bother with non-allocated sections */
2137 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2140 if (sechdrs[i].sh_type == SHT_REL)
2141 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2142 else if (sechdrs[i].sh_type == SHT_RELA)
2143 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2148 #ifdef CONFIG_MARKERS
2149 mod->markers = (void *)sechdrs[markersindex].sh_addr;
2151 sechdrs[markersindex].sh_size / sizeof(*mod->markers);
2153 #ifdef CONFIG_TRACEPOINTS
2154 mod->tracepoints = (void *)sechdrs[tracepointsindex].sh_addr;
2155 mod->num_tracepoints =
2156 sechdrs[tracepointsindex].sh_size / sizeof(*mod->tracepoints);
2160 /* Find duplicate symbols */
2161 err = verify_export_symbols(mod);
2166 /* Set up and sort exception table */
2167 mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable);
2168 mod->extable = extable = (void *)sechdrs[exindex].sh_addr;
2169 sort_extable(extable, extable + mod->num_exentries);
2171 /* Finally, copy percpu area over. */
2172 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
2173 sechdrs[pcpuindex].sh_size);
2175 add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
2178 #ifdef CONFIG_MARKERS
2179 marker_update_probe_range(mod->markers,
2180 mod->markers + mod->num_markers);
2182 #ifdef CONFIG_TRACEPOINTS
2183 tracepoint_update_probe_range(mod->tracepoints,
2184 mod->tracepoints + mod->num_tracepoints);
2187 err = module_finalize(hdr, sechdrs, mod);
2191 /* flush the icache in correct context */
2196 * Flush the instruction cache, since we've played with text.
2197 * Do it before processing of module parameters, so the module
2198 * can provide parameter accessor functions of its own.
2200 if (mod->module_init)
2201 flush_icache_range((unsigned long)mod->module_init,
2202 (unsigned long)mod->module_init
2204 flush_icache_range((unsigned long)mod->module_core,
2205 (unsigned long)mod->module_core + mod->core_size);
2211 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2214 /* Now sew it into the lists so we can get lockdep and oops
2215 * info during argument parsing. Noone should access us, since
2216 * strong_try_module_get() will fail. */
2217 stop_machine(__link_module, mod, NULL);
2219 /* Size of section 0 is 0, so this works well if no params */
2220 err = parse_args(mod->name, mod->args,
2221 (struct kernel_param *)
2222 sechdrs[setupindex].sh_addr,
2223 sechdrs[setupindex].sh_size
2224 / sizeof(struct kernel_param),
2229 err = mod_sysfs_setup(mod,
2230 (struct kernel_param *)
2231 sechdrs[setupindex].sh_addr,
2232 sechdrs[setupindex].sh_size
2233 / sizeof(struct kernel_param));
2236 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2237 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2239 /* Size of section 0 is 0, so this works well if no unwind info. */
2240 mod->unwind_info = unwind_add_table(mod,
2241 (void *)sechdrs[unwindex].sh_addr,
2242 sechdrs[unwindex].sh_size);
2244 /* Get rid of temporary copy */
2251 stop_machine(__unlink_module, mod, NULL);
2252 module_arch_cleanup(mod);
2254 kobject_del(&mod->mkobj.kobj);
2255 kobject_put(&mod->mkobj.kobj);
2257 module_unload_free(mod);
2258 module_free(mod, mod->module_init);
2260 module_free(mod, mod->module_core);
2263 percpu_modfree(percpu);
2268 return ERR_PTR(err);
2271 printk(KERN_ERR "Module len %lu truncated\n", len);
2276 /* This is where the real work happens */
2278 sys_init_module(void __user *umod,
2280 const char __user *uargs)
2285 /* Must have permission */
2286 if (!capable(CAP_SYS_MODULE))
2289 /* Only one module load at a time, please */
2290 if (mutex_lock_interruptible(&module_mutex) != 0)
2293 /* Do all the hard work */
2294 mod = load_module(umod, len, uargs);
2296 mutex_unlock(&module_mutex);
2297 return PTR_ERR(mod);
2300 /* Drop lock so they can recurse */
2301 mutex_unlock(&module_mutex);
2303 blocking_notifier_call_chain(&module_notify_list,
2304 MODULE_STATE_COMING, mod);
2306 /* Start the module */
2307 if (mod->init != NULL)
2308 ret = do_one_initcall(mod->init);
2310 /* Init routine failed: abort. Try to protect us from
2311 buggy refcounters. */
2312 mod->state = MODULE_STATE_GOING;
2313 synchronize_sched();
2315 blocking_notifier_call_chain(&module_notify_list,
2316 MODULE_STATE_GOING, mod);
2317 mutex_lock(&module_mutex);
2319 mutex_unlock(&module_mutex);
2320 wake_up(&module_wq);
2324 printk(KERN_WARNING "%s: '%s'->init suspiciously returned %d, "
2325 "it should follow 0/-E convention\n"
2326 KERN_WARNING "%s: loading module anyway...\n",
2327 __func__, mod->name, ret,
2332 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2333 mod->state = MODULE_STATE_LIVE;
2334 wake_up(&module_wq);
2336 mutex_lock(&module_mutex);
2337 /* Drop initial reference. */
2339 unwind_remove_table(mod->unwind_info, 1);
2340 module_free(mod, mod->module_init);
2341 mod->module_init = NULL;
2343 mod->init_text_size = 0;
2344 mutex_unlock(&module_mutex);
2349 static inline int within(unsigned long addr, void *start, unsigned long size)
2351 return ((void *)addr >= start && (void *)addr < start + size);
2354 #ifdef CONFIG_KALLSYMS
2356 * This ignores the intensely annoying "mapping symbols" found
2357 * in ARM ELF files: $a, $t and $d.
2359 static inline int is_arm_mapping_symbol(const char *str)
2361 return str[0] == '$' && strchr("atd", str[1])
2362 && (str[2] == '\0' || str[2] == '.');
2365 static const char *get_ksymbol(struct module *mod,
2367 unsigned long *size,
2368 unsigned long *offset)
2370 unsigned int i, best = 0;
2371 unsigned long nextval;
2373 /* At worse, next value is at end of module */
2374 if (within(addr, mod->module_init, mod->init_size))
2375 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2377 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2379 /* Scan for closest preceeding symbol, and next symbol. (ELF
2380 starts real symbols at 1). */
2381 for (i = 1; i < mod->num_symtab; i++) {
2382 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2385 /* We ignore unnamed symbols: they're uninformative
2386 * and inserted at a whim. */
2387 if (mod->symtab[i].st_value <= addr
2388 && mod->symtab[i].st_value > mod->symtab[best].st_value
2389 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2390 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2392 if (mod->symtab[i].st_value > addr
2393 && mod->symtab[i].st_value < nextval
2394 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2395 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2396 nextval = mod->symtab[i].st_value;
2403 *size = nextval - mod->symtab[best].st_value;
2405 *offset = addr - mod->symtab[best].st_value;
2406 return mod->strtab + mod->symtab[best].st_name;
2409 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2410 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2411 const char *module_address_lookup(unsigned long addr,
2412 unsigned long *size,
2413 unsigned long *offset,
2418 const char *ret = NULL;
2421 list_for_each_entry(mod, &modules, list) {
2422 if (within(addr, mod->module_init, mod->init_size)
2423 || within(addr, mod->module_core, mod->core_size)) {
2425 *modname = mod->name;
2426 ret = get_ksymbol(mod, addr, size, offset);
2430 /* Make a copy in here where it's safe */
2432 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2439 int lookup_module_symbol_name(unsigned long addr, char *symname)
2444 list_for_each_entry(mod, &modules, list) {
2445 if (within(addr, mod->module_init, mod->init_size) ||
2446 within(addr, mod->module_core, mod->core_size)) {
2449 sym = get_ksymbol(mod, addr, NULL, NULL);
2452 strlcpy(symname, sym, KSYM_NAME_LEN);
2462 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2463 unsigned long *offset, char *modname, char *name)
2468 list_for_each_entry(mod, &modules, list) {
2469 if (within(addr, mod->module_init, mod->init_size) ||
2470 within(addr, mod->module_core, mod->core_size)) {
2473 sym = get_ksymbol(mod, addr, size, offset);
2477 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2479 strlcpy(name, sym, KSYM_NAME_LEN);
2489 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2490 char *name, char *module_name, int *exported)
2495 list_for_each_entry(mod, &modules, list) {
2496 if (symnum < mod->num_symtab) {
2497 *value = mod->symtab[symnum].st_value;
2498 *type = mod->symtab[symnum].st_info;
2499 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2501 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2502 *exported = is_exported(name, mod);
2506 symnum -= mod->num_symtab;
2512 static unsigned long mod_find_symname(struct module *mod, const char *name)
2516 for (i = 0; i < mod->num_symtab; i++)
2517 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2518 mod->symtab[i].st_info != 'U')
2519 return mod->symtab[i].st_value;
2523 /* Look for this name: can be of form module:name. */
2524 unsigned long module_kallsyms_lookup_name(const char *name)
2528 unsigned long ret = 0;
2530 /* Don't lock: we're in enough trouble already. */
2532 if ((colon = strchr(name, ':')) != NULL) {
2534 if ((mod = find_module(name)) != NULL)
2535 ret = mod_find_symname(mod, colon+1);
2538 list_for_each_entry(mod, &modules, list)
2539 if ((ret = mod_find_symname(mod, name)) != 0)
2545 #endif /* CONFIG_KALLSYMS */
2547 /* Called by the /proc file system to return a list of modules. */
2548 static void *m_start(struct seq_file *m, loff_t *pos)
2550 mutex_lock(&module_mutex);
2551 return seq_list_start(&modules, *pos);
2554 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2556 return seq_list_next(p, &modules, pos);
2559 static void m_stop(struct seq_file *m, void *p)
2561 mutex_unlock(&module_mutex);
2564 static char *module_flags(struct module *mod, char *buf)
2569 mod->state == MODULE_STATE_GOING ||
2570 mod->state == MODULE_STATE_COMING) {
2572 if (mod->taints & TAINT_PROPRIETARY_MODULE)
2574 if (mod->taints & TAINT_FORCED_MODULE)
2577 * TAINT_FORCED_RMMOD: could be added.
2578 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2582 /* Show a - for module-is-being-unloaded */
2583 if (mod->state == MODULE_STATE_GOING)
2585 /* Show a + for module-is-being-loaded */
2586 if (mod->state == MODULE_STATE_COMING)
2595 static int m_show(struct seq_file *m, void *p)
2597 struct module *mod = list_entry(p, struct module, list);
2600 seq_printf(m, "%s %u",
2601 mod->name, mod->init_size + mod->core_size);
2602 print_unload_info(m, mod);
2604 /* Informative for users. */
2605 seq_printf(m, " %s",
2606 mod->state == MODULE_STATE_GOING ? "Unloading":
2607 mod->state == MODULE_STATE_COMING ? "Loading":
2609 /* Used by oprofile and other similar tools. */
2610 seq_printf(m, " 0x%p", mod->module_core);
2614 seq_printf(m, " %s", module_flags(mod, buf));
2616 seq_printf(m, "\n");
2620 /* Format: modulename size refcount deps address
2622 Where refcount is a number or -, and deps is a comma-separated list
2625 const struct seq_operations modules_op = {
2632 /* Given an address, look for it in the module exception tables. */
2633 const struct exception_table_entry *search_module_extables(unsigned long addr)
2635 const struct exception_table_entry *e = NULL;
2639 list_for_each_entry(mod, &modules, list) {
2640 if (mod->num_exentries == 0)
2643 e = search_extable(mod->extable,
2644 mod->extable + mod->num_exentries - 1,
2651 /* Now, if we found one, we are running inside it now, hence
2652 we cannot unload the module, hence no refcnt needed. */
2657 * Is this a valid module address?
2659 int is_module_address(unsigned long addr)
2665 list_for_each_entry(mod, &modules, list) {
2666 if (within(addr, mod->module_core, mod->core_size)) {
2678 /* Is this a valid kernel address? */
2679 struct module *__module_text_address(unsigned long addr)
2683 if (addr < module_addr_min || addr > module_addr_max)
2686 list_for_each_entry(mod, &modules, list)
2687 if (within(addr, mod->module_init, mod->init_text_size)
2688 || within(addr, mod->module_core, mod->core_text_size))
2693 struct module *module_text_address(unsigned long addr)
2698 mod = __module_text_address(addr);
2704 /* Don't grab lock, we're oopsing. */
2705 void print_modules(void)
2710 printk("Modules linked in:");
2711 list_for_each_entry(mod, &modules, list)
2712 printk(" %s%s", mod->name, module_flags(mod, buf));
2713 if (last_unloaded_module[0])
2714 printk(" [last unloaded: %s]", last_unloaded_module);
2718 #ifdef CONFIG_MODVERSIONS
2719 /* Generate the signature for struct module here, too, for modversions. */
2720 void struct_module(struct module *mod) { return; }
2721 EXPORT_SYMBOL(struct_module);
2724 #ifdef CONFIG_MARKERS
2725 void module_update_markers(void)
2729 mutex_lock(&module_mutex);
2730 list_for_each_entry(mod, &modules, list)
2732 marker_update_probe_range(mod->markers,
2733 mod->markers + mod->num_markers);
2734 mutex_unlock(&module_mutex);
2738 #ifdef CONFIG_TRACEPOINTS
2739 void module_update_tracepoints(void)
2743 mutex_lock(&module_mutex);
2744 list_for_each_entry(mod, &modules, list)
2746 tracepoint_update_probe_range(mod->tracepoints,
2747 mod->tracepoints + mod->num_tracepoints);
2748 mutex_unlock(&module_mutex);
2752 * Returns 0 if current not found.
2753 * Returns 1 if current found.
2755 int module_get_iter_tracepoints(struct tracepoint_iter *iter)
2757 struct module *iter_mod;
2760 mutex_lock(&module_mutex);
2761 list_for_each_entry(iter_mod, &modules, list) {
2762 if (!iter_mod->taints) {
2764 * Sorted module list
2766 if (iter_mod < iter->module)
2768 else if (iter_mod > iter->module)
2769 iter->tracepoint = NULL;
2770 found = tracepoint_get_iter_range(&iter->tracepoint,
2771 iter_mod->tracepoints,
2772 iter_mod->tracepoints
2773 + iter_mod->num_tracepoints);
2775 iter->module = iter_mod;
2780 mutex_unlock(&module_mutex);