1 /* Postprocess module symbol versions
3 * Copyright 2003 Kai Germaschewski
4 * Copyright 2002-2004 Rusty Russell, IBM Corporation
5 * Copyright 2006-2008 Sam Ravnborg
6 * Based in part on module-init-tools/depmod.c,file2alias
8 * This software may be used and distributed according to the terms
9 * of the GNU General Public License, incorporated herein by reference.
11 * Usage: modpost vmlinux module1.o module2.o ...
23 #include "../../include/linux/license.h"
25 /* Are we using CONFIG_MODVERSIONS? */
26 static int modversions = 0;
27 /* Warn about undefined symbols? (do so if we have vmlinux) */
28 static int have_vmlinux = 0;
29 /* Is CONFIG_MODULE_SRCVERSION_ALL set? */
30 static int all_versions = 0;
31 /* If we are modposting external module set to 1 */
32 static int external_module = 0;
33 /* Warn about section mismatch in vmlinux if set to 1 */
34 static int vmlinux_section_warnings = 1;
35 /* Only warn about unresolved symbols */
36 static int warn_unresolved = 0;
37 /* How a symbol is exported */
38 static int sec_mismatch_count = 0;
39 static int sec_mismatch_fatal = 0;
40 /* ignore missing files */
41 static int ignore_missing_files;
42 /* If set to 1, only warn (instead of error) about missing ns imports */
43 static int allow_missing_ns_imports;
46 export_plain, export_unused, export_gpl,
47 export_unused_gpl, export_gpl_future, export_unknown
50 /* In kernel, this size is defined in linux/module.h;
51 * here we use Elf_Addr instead of long for covering cross-compile
54 #define MODULE_NAME_LEN (64 - sizeof(Elf_Addr))
56 void __attribute__((format(printf, 2, 3)))
57 modpost_log(enum loglevel loglevel, const char *fmt, ...)
63 fprintf(stderr, "WARNING: ");
66 fprintf(stderr, "ERROR: ");
69 fprintf(stderr, "FATAL: ");
71 default: /* invalid loglevel, ignore */
75 fprintf(stderr, "modpost: ");
77 va_start(arglist, fmt);
78 vfprintf(stderr, fmt, arglist);
81 if (loglevel == LOG_FATAL)
85 static inline bool strends(const char *str, const char *postfix)
87 if (strlen(str) < strlen(postfix))
90 return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
93 static int is_vmlinux(const char *modname)
97 myname = strrchr(modname, '/');
103 return (strcmp(myname, "vmlinux") == 0) ||
104 (strcmp(myname, "vmlinux.o") == 0);
107 void *do_nofail(void *ptr, const char *expr)
110 fatal("Memory allocation failure: %s.\n", expr);
115 /* A list of all modules we processed */
116 static struct module *modules;
118 static struct module *find_module(const char *modname)
122 for (mod = modules; mod; mod = mod->next)
123 if (strcmp(mod->name, modname) == 0)
128 static struct module *new_module(const char *modname)
133 mod = NOFAIL(malloc(sizeof(*mod)));
134 memset(mod, 0, sizeof(*mod));
135 p = NOFAIL(strdup(modname));
137 /* strip trailing .o */
138 if (strends(p, ".o")) {
139 p[strlen(p) - 2] = '\0';
145 mod->gpl_compatible = -1;
152 /* A hash of all exported symbols,
153 * struct symbol is also used for lists of unresolved symbols */
155 #define SYMBOL_HASH_SIZE 1024
159 struct module *module;
164 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
165 unsigned int kernel:1; /* 1 if symbol is from kernel
166 * (only for external modules) **/
167 unsigned int is_static:1; /* 1 if symbol is not global */
168 enum export export; /* Type of export */
172 static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
174 /* This is based on the hash agorithm from gdbm, via tdb */
175 static inline unsigned int tdb_hash(const char *name)
177 unsigned value; /* Used to compute the hash value. */
178 unsigned i; /* Used to cycle through random values. */
180 /* Set the initial value from the key size. */
181 for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
182 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
184 return (1103515243 * value + 12345);
188 * Allocate a new symbols for use in the hash of exported symbols or
189 * the list of unresolved symbols per module
191 static struct symbol *alloc_symbol(const char *name, unsigned int weak,
194 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
196 memset(s, 0, sizeof(*s));
197 strcpy(s->name, name);
204 /* For the hash of exported symbols */
205 static struct symbol *new_symbol(const char *name, struct module *module,
210 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
211 symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
213 return symbolhash[hash];
216 static struct symbol *find_symbol(const char *name)
220 /* For our purposes, .foo matches foo. PPC64 needs this. */
224 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
225 if (strcmp(s->name, name) == 0)
231 static bool contains_namespace(struct namespace_list *list,
232 const char *namespace)
234 for (; list; list = list->next)
235 if (!strcmp(list->namespace, namespace))
241 static void add_namespace(struct namespace_list **list, const char *namespace)
243 struct namespace_list *ns_entry;
245 if (!contains_namespace(*list, namespace)) {
246 ns_entry = NOFAIL(malloc(sizeof(struct namespace_list) +
247 strlen(namespace) + 1));
248 strcpy(ns_entry->namespace, namespace);
249 ns_entry->next = *list;
254 static bool module_imports_namespace(struct module *module,
255 const char *namespace)
257 return contains_namespace(module->imported_namespaces, namespace);
260 static const struct {
264 { .str = "EXPORT_SYMBOL", .export = export_plain },
265 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
266 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
267 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
268 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
269 { .str = "(unknown)", .export = export_unknown },
273 static const char *export_str(enum export ex)
275 return export_list[ex].str;
278 static enum export export_no(const char *s)
283 return export_unknown;
284 for (i = 0; export_list[i].export != export_unknown; i++) {
285 if (strcmp(export_list[i].str, s) == 0)
286 return export_list[i].export;
288 return export_unknown;
291 static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
293 return (void *)elf->hdr +
294 elf->sechdrs[elf->secindex_strings].sh_offset +
298 static const char *sec_name(struct elf_info *elf, int secindex)
300 return sech_name(elf, &elf->sechdrs[secindex]);
303 static void *sym_get_data(const struct elf_info *info, const Elf_Sym *sym)
305 unsigned int secindex = get_secindex(info, sym);
306 Elf_Shdr *sechdr = &info->sechdrs[secindex];
307 unsigned long offset;
309 offset = sym->st_value;
310 if (info->hdr->e_type != ET_REL)
311 offset -= sechdr->sh_addr;
313 return (void *)info->hdr + sechdr->sh_offset + offset;
316 #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
318 static enum export export_from_secname(struct elf_info *elf, unsigned int sec)
320 const char *secname = sec_name(elf, sec);
322 if (strstarts(secname, "___ksymtab+"))
324 else if (strstarts(secname, "___ksymtab_unused+"))
325 return export_unused;
326 else if (strstarts(secname, "___ksymtab_gpl+"))
328 else if (strstarts(secname, "___ksymtab_unused_gpl+"))
329 return export_unused_gpl;
330 else if (strstarts(secname, "___ksymtab_gpl_future+"))
331 return export_gpl_future;
333 return export_unknown;
336 static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
338 if (sec == elf->export_sec)
340 else if (sec == elf->export_unused_sec)
341 return export_unused;
342 else if (sec == elf->export_gpl_sec)
344 else if (sec == elf->export_unused_gpl_sec)
345 return export_unused_gpl;
346 else if (sec == elf->export_gpl_future_sec)
347 return export_gpl_future;
349 return export_unknown;
352 static const char *namespace_from_kstrtabns(const struct elf_info *info,
355 const char *value = sym_get_data(info, sym);
356 return value[0] ? value : NULL;
359 static void sym_update_namespace(const char *symname, const char *namespace)
361 struct symbol *s = find_symbol(symname);
364 * That symbol should have been created earlier and thus this is
365 * actually an assertion.
368 merror("Could not update namespace(%s) for symbol %s\n",
375 namespace && namespace[0] ? NOFAIL(strdup(namespace)) : NULL;
379 * Add an exported symbol - it may have already been added without a
380 * CRC, in this case just update the CRC
382 static struct symbol *sym_add_exported(const char *name, struct module *mod,
385 struct symbol *s = find_symbol(name);
388 s = new_symbol(name, mod, export);
389 } else if (!external_module || is_vmlinux(s->module->name) ||
391 warn("%s: '%s' exported twice. Previous export was in %s%s\n",
392 mod->name, name, s->module->name,
393 is_vmlinux(s->module->name) ? "" : ".ko");
398 s->vmlinux = is_vmlinux(mod->name);
404 static void sym_set_crc(const char *name, unsigned int crc)
406 struct symbol *s = find_symbol(name);
409 * Ignore stand-alone __crc_*, which might be auto-generated symbols
410 * such as __*_veneer in ARM ELF.
419 void *grab_file(const char *filename, unsigned long *size)
422 void *map = MAP_FAILED;
425 fd = open(filename, O_RDONLY);
432 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
436 if (map == MAP_FAILED)
442 * Return a copy of the next line in a mmap'ed file.
443 * spaces in the beginning of the line is trimmed away.
444 * Return a pointer to a static buffer.
446 char *get_next_line(unsigned long *pos, void *file, unsigned long size)
448 static char line[4096];
451 signed char *p = (signed char *)file + *pos;
454 for (; *pos < size ; (*pos)++) {
455 if (skip && isspace(*p)) {
460 if (*p != '\n' && (*pos < size)) {
464 break; /* Too long, stop */
475 void release_file(void *file, unsigned long size)
480 static int parse_elf(struct elf_info *info, const char *filename)
486 const char *secstrings;
487 unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;
489 hdr = grab_file(filename, &info->size);
491 if (ignore_missing_files) {
492 fprintf(stderr, "%s: %s (ignored)\n", filename,
500 if (info->size < sizeof(*hdr)) {
501 /* file too small, assume this is an empty .o file */
504 /* Is this a valid ELF file? */
505 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
506 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
507 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
508 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
509 /* Not an ELF file - silently ignore it */
512 /* Fix endianness in ELF header */
513 hdr->e_type = TO_NATIVE(hdr->e_type);
514 hdr->e_machine = TO_NATIVE(hdr->e_machine);
515 hdr->e_version = TO_NATIVE(hdr->e_version);
516 hdr->e_entry = TO_NATIVE(hdr->e_entry);
517 hdr->e_phoff = TO_NATIVE(hdr->e_phoff);
518 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
519 hdr->e_flags = TO_NATIVE(hdr->e_flags);
520 hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize);
521 hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize);
522 hdr->e_phnum = TO_NATIVE(hdr->e_phnum);
523 hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize);
524 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
525 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
526 sechdrs = (void *)hdr + hdr->e_shoff;
527 info->sechdrs = sechdrs;
529 /* Check if file offset is correct */
530 if (hdr->e_shoff > info->size) {
531 fatal("section header offset=%lu in file '%s' is bigger than "
532 "filesize=%lu\n", (unsigned long)hdr->e_shoff,
533 filename, info->size);
537 if (hdr->e_shnum == SHN_UNDEF) {
539 * There are more than 64k sections,
540 * read count from .sh_size.
542 info->num_sections = TO_NATIVE(sechdrs[0].sh_size);
545 info->num_sections = hdr->e_shnum;
547 if (hdr->e_shstrndx == SHN_XINDEX) {
548 info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link);
551 info->secindex_strings = hdr->e_shstrndx;
554 /* Fix endianness in section headers */
555 for (i = 0; i < info->num_sections; i++) {
556 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
557 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
558 sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags);
559 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
560 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
561 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
562 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
563 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
564 sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign);
565 sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize);
567 /* Find symbol table. */
568 secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset;
569 for (i = 1; i < info->num_sections; i++) {
571 int nobits = sechdrs[i].sh_type == SHT_NOBITS;
573 if (!nobits && sechdrs[i].sh_offset > info->size) {
574 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
575 "sizeof(*hrd)=%zu\n", filename,
576 (unsigned long)sechdrs[i].sh_offset,
580 secname = secstrings + sechdrs[i].sh_name;
581 if (strcmp(secname, ".modinfo") == 0) {
583 fatal("%s has NOBITS .modinfo\n", filename);
584 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
585 info->modinfo_len = sechdrs[i].sh_size;
586 } else if (strcmp(secname, "__ksymtab") == 0)
587 info->export_sec = i;
588 else if (strcmp(secname, "__ksymtab_unused") == 0)
589 info->export_unused_sec = i;
590 else if (strcmp(secname, "__ksymtab_gpl") == 0)
591 info->export_gpl_sec = i;
592 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
593 info->export_unused_gpl_sec = i;
594 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
595 info->export_gpl_future_sec = i;
597 if (sechdrs[i].sh_type == SHT_SYMTAB) {
598 unsigned int sh_link_idx;
600 info->symtab_start = (void *)hdr +
601 sechdrs[i].sh_offset;
602 info->symtab_stop = (void *)hdr +
603 sechdrs[i].sh_offset + sechdrs[i].sh_size;
604 sh_link_idx = sechdrs[i].sh_link;
605 info->strtab = (void *)hdr +
606 sechdrs[sh_link_idx].sh_offset;
609 /* 32bit section no. table? ("more than 64k sections") */
610 if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
611 symtab_shndx_idx = i;
612 info->symtab_shndx_start = (void *)hdr +
613 sechdrs[i].sh_offset;
614 info->symtab_shndx_stop = (void *)hdr +
615 sechdrs[i].sh_offset + sechdrs[i].sh_size;
618 if (!info->symtab_start)
619 fatal("%s has no symtab?\n", filename);
621 /* Fix endianness in symbols */
622 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
623 sym->st_shndx = TO_NATIVE(sym->st_shndx);
624 sym->st_name = TO_NATIVE(sym->st_name);
625 sym->st_value = TO_NATIVE(sym->st_value);
626 sym->st_size = TO_NATIVE(sym->st_size);
629 if (symtab_shndx_idx != ~0U) {
631 if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link)
632 fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
633 filename, sechdrs[symtab_shndx_idx].sh_link,
636 for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
644 static void parse_elf_finish(struct elf_info *info)
646 release_file(info->hdr, info->size);
649 static int ignore_undef_symbol(struct elf_info *info, const char *symname)
651 /* ignore __this_module, it will be resolved shortly */
652 if (strcmp(symname, "__this_module") == 0)
654 /* ignore global offset table */
655 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
657 if (info->hdr->e_machine == EM_PPC)
658 /* Special register function linked on all modules during final link of .ko */
659 if (strstarts(symname, "_restgpr_") ||
660 strstarts(symname, "_savegpr_") ||
661 strstarts(symname, "_rest32gpr_") ||
662 strstarts(symname, "_save32gpr_") ||
663 strstarts(symname, "_restvr_") ||
664 strstarts(symname, "_savevr_"))
666 if (info->hdr->e_machine == EM_PPC64)
667 /* Special register function linked on all modules during final link of .ko */
668 if (strstarts(symname, "_restgpr0_") ||
669 strstarts(symname, "_savegpr0_") ||
670 strstarts(symname, "_restvr_") ||
671 strstarts(symname, "_savevr_") ||
672 strcmp(symname, ".TOC.") == 0)
674 /* Do not ignore this symbol */
678 static void handle_modversion(const struct module *mod,
679 const struct elf_info *info,
680 const Elf_Sym *sym, const char *symname)
684 if (sym->st_shndx == SHN_UNDEF) {
685 warn("EXPORT symbol \"%s\" [%s%s] version generation failed, symbol will not be versioned.\n",
686 symname, mod->name, is_vmlinux(mod->name) ? "":".ko");
690 if (sym->st_shndx == SHN_ABS) {
695 /* symbol points to the CRC in the ELF object */
696 crcp = sym_get_data(info, sym);
697 crc = TO_NATIVE(*crcp);
699 sym_set_crc(symname, crc);
702 static void handle_symbol(struct module *mod, struct elf_info *info,
703 const Elf_Sym *sym, const char *symname)
708 if ((!is_vmlinux(mod->name) || mod->is_dot_o) &&
709 strstarts(symname, "__ksymtab"))
710 export = export_from_secname(info, get_secindex(info, sym));
712 export = export_from_sec(info, get_secindex(info, sym));
714 switch (sym->st_shndx) {
716 if (strstarts(symname, "__gnu_lto_")) {
717 /* Should warn here, but modpost runs before the linker */
719 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
722 /* undefined symbol */
723 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
724 ELF_ST_BIND(sym->st_info) != STB_WEAK)
726 if (ignore_undef_symbol(info, symname))
728 if (info->hdr->e_machine == EM_SPARC ||
729 info->hdr->e_machine == EM_SPARCV9) {
730 /* Ignore register directives. */
731 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
733 if (symname[0] == '.') {
734 char *munged = NOFAIL(strdup(symname));
736 munged[1] = toupper(munged[1]);
741 mod->unres = alloc_symbol(symname,
742 ELF_ST_BIND(sym->st_info) == STB_WEAK,
746 /* All exported symbols */
747 if (strstarts(symname, "__ksymtab_")) {
748 name = symname + strlen("__ksymtab_");
749 sym_add_exported(name, mod, export);
751 if (strcmp(symname, "init_module") == 0)
753 if (strcmp(symname, "cleanup_module") == 0)
754 mod->has_cleanup = 1;
760 * Parse tag=value strings from .modinfo section
762 static char *next_string(char *string, unsigned long *secsize)
764 /* Skip non-zero chars */
767 if ((*secsize)-- <= 1)
771 /* Skip any zero padding. */
774 if ((*secsize)-- <= 1)
780 static char *get_next_modinfo(struct elf_info *info, const char *tag,
784 unsigned int taglen = strlen(tag);
785 char *modinfo = info->modinfo;
786 unsigned long size = info->modinfo_len;
789 size -= prev - modinfo;
790 modinfo = next_string(prev, &size);
793 for (p = modinfo; p; p = next_string(p, &size)) {
794 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
795 return p + taglen + 1;
800 static char *get_modinfo(struct elf_info *info, const char *tag)
803 return get_next_modinfo(info, tag, NULL);
807 * Test if string s ends in string sub
810 static int strrcmp(const char *s, const char *sub)
818 sublen = strlen(sub);
820 if ((slen == 0) || (sublen == 0))
826 return memcmp(s + slen - sublen, sub, sublen);
829 static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
832 return elf->strtab + sym->st_name;
837 /* The pattern is an array of simple patterns.
838 * "foo" will match an exact string equal to "foo"
839 * "*foo" will match a string that ends with "foo"
840 * "foo*" will match a string that begins with "foo"
841 * "*foo*" will match a string that contains "foo"
843 static int match(const char *sym, const char * const pat[])
848 const char *endp = p + strlen(p) - 1;
851 if (*p == '*' && *endp == '*') {
852 char *bare = NOFAIL(strndup(p + 1, strlen(p) - 2));
853 char *here = strstr(sym, bare);
860 else if (*p == '*') {
861 if (strrcmp(sym, p + 1) == 0)
865 else if (*endp == '*') {
866 if (strncmp(sym, p, strlen(p) - 1) == 0)
871 if (strcmp(p, sym) == 0)
879 /* sections that we do not want to do full section mismatch check on */
880 static const char *const section_white_list[] =
884 ".cranges", /* sh64 */
885 ".zdebug*", /* Compressed debug sections. */
886 ".GCC.command.line", /* record-gcc-switches */
887 ".mdebug*", /* alpha, score, mips etc. */
888 ".pdr", /* alpha, score, mips etc. */
893 ".xt.prop", /* xtensa */
894 ".xt.lit", /* xtensa */
895 ".arcextmap*", /* arc */
896 ".gnu.linkonce.arcext*", /* arc : modules */
897 ".cmem*", /* EZchip */
898 ".fmt_slot*", /* EZchip */
905 * This is used to find sections missing the SHF_ALLOC flag.
906 * The cause of this is often a section specified in assembler
907 * without "ax" / "aw".
909 static void check_section(const char *modname, struct elf_info *elf,
912 const char *sec = sech_name(elf, sechdr);
914 if (sechdr->sh_type == SHT_PROGBITS &&
915 !(sechdr->sh_flags & SHF_ALLOC) &&
916 !match(sec, section_white_list)) {
917 warn("%s (%s): unexpected non-allocatable section.\n"
918 "Did you forget to use \"ax\"/\"aw\" in a .S file?\n"
919 "Note that for example <linux/init.h> contains\n"
920 "section definitions for use in .S files.\n\n",
927 #define ALL_INIT_DATA_SECTIONS \
928 ".init.setup", ".init.rodata", ".meminit.rodata", \
929 ".init.data", ".meminit.data"
930 #define ALL_EXIT_DATA_SECTIONS \
931 ".exit.data", ".memexit.data"
933 #define ALL_INIT_TEXT_SECTIONS \
934 ".init.text", ".meminit.text"
935 #define ALL_EXIT_TEXT_SECTIONS \
936 ".exit.text", ".memexit.text"
938 #define ALL_PCI_INIT_SECTIONS \
939 ".pci_fixup_early", ".pci_fixup_header", ".pci_fixup_final", \
940 ".pci_fixup_enable", ".pci_fixup_resume", \
941 ".pci_fixup_resume_early", ".pci_fixup_suspend"
943 #define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS
944 #define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS
946 #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
947 #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
949 #define DATA_SECTIONS ".data", ".data.rel"
950 #define TEXT_SECTIONS ".text", ".text.unlikely", ".sched.text", \
951 ".kprobes.text", ".cpuidle.text"
952 #define OTHER_TEXT_SECTIONS ".ref.text", ".head.text", ".spinlock.text", \
953 ".fixup", ".entry.text", ".exception.text", ".text.*", \
956 #define INIT_SECTIONS ".init.*"
957 #define MEM_INIT_SECTIONS ".meminit.*"
959 #define EXIT_SECTIONS ".exit.*"
960 #define MEM_EXIT_SECTIONS ".memexit.*"
962 #define ALL_TEXT_SECTIONS ALL_INIT_TEXT_SECTIONS, ALL_EXIT_TEXT_SECTIONS, \
963 TEXT_SECTIONS, OTHER_TEXT_SECTIONS
965 /* init data sections */
966 static const char *const init_data_sections[] =
967 { ALL_INIT_DATA_SECTIONS, NULL };
969 /* all init sections */
970 static const char *const init_sections[] = { ALL_INIT_SECTIONS, NULL };
972 /* All init and exit sections (code + data) */
973 static const char *const init_exit_sections[] =
974 {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };
976 /* all text sections */
977 static const char *const text_sections[] = { ALL_TEXT_SECTIONS, NULL };
980 static const char *const data_sections[] = { DATA_SECTIONS, NULL };
983 /* symbols in .data that may refer to init/exit sections */
984 #define DEFAULT_SYMBOL_WHITE_LIST \
986 "*_template", /* scsi uses *_template a lot */ \
987 "*_timer", /* arm uses ops structures named _timer a lot */ \
988 "*_sht", /* scsi also used *_sht to some extent */ \
994 static const char *const head_sections[] = { ".head.text*", NULL };
995 static const char *const linker_symbols[] =
996 { "__init_begin", "_sinittext", "_einittext", NULL };
997 static const char *const optim_symbols[] = { "*.constprop.*", NULL };
1004 XXXINIT_TO_SOME_INIT,
1005 XXXEXIT_TO_SOME_EXIT,
1006 ANY_INIT_TO_ANY_EXIT,
1007 ANY_EXIT_TO_ANY_INIT,
1008 EXPORT_TO_INIT_EXIT,
1009 EXTABLE_TO_NON_TEXT,
1013 * Describe how to match sections on different criterias:
1015 * @fromsec: Array of sections to be matched.
1017 * @bad_tosec: Relocations applied to a section in @fromsec to a section in
1018 * this array is forbidden (black-list). Can be empty.
1020 * @good_tosec: Relocations applied to a section in @fromsec must be
1021 * targetting sections in this array (white-list). Can be empty.
1023 * @mismatch: Type of mismatch.
1025 * @symbol_white_list: Do not match a relocation to a symbol in this list
1026 * even if it is targetting a section in @bad_to_sec.
1028 * @handler: Specific handler to call when a match is found. If NULL,
1029 * default_mismatch_handler() will be called.
1032 struct sectioncheck {
1033 const char *fromsec[20];
1034 const char *bad_tosec[20];
1035 const char *good_tosec[20];
1036 enum mismatch mismatch;
1037 const char *symbol_white_list[20];
1038 void (*handler)(const char *modname, struct elf_info *elf,
1039 const struct sectioncheck* const mismatch,
1040 Elf_Rela *r, Elf_Sym *sym, const char *fromsec);
1044 static void extable_mismatch_handler(const char *modname, struct elf_info *elf,
1045 const struct sectioncheck* const mismatch,
1046 Elf_Rela *r, Elf_Sym *sym,
1047 const char *fromsec);
1049 static const struct sectioncheck sectioncheck[] = {
1050 /* Do not reference init/exit code/data from
1051 * normal code and data
1054 .fromsec = { TEXT_SECTIONS, NULL },
1055 .bad_tosec = { ALL_INIT_SECTIONS, NULL },
1056 .mismatch = TEXT_TO_ANY_INIT,
1057 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1060 .fromsec = { DATA_SECTIONS, NULL },
1061 .bad_tosec = { ALL_XXXINIT_SECTIONS, NULL },
1062 .mismatch = DATA_TO_ANY_INIT,
1063 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1066 .fromsec = { DATA_SECTIONS, NULL },
1067 .bad_tosec = { INIT_SECTIONS, NULL },
1068 .mismatch = DATA_TO_ANY_INIT,
1069 .symbol_white_list = {
1070 "*_template", "*_timer", "*_sht", "*_ops",
1071 "*_probe", "*_probe_one", "*_console", NULL
1075 .fromsec = { TEXT_SECTIONS, NULL },
1076 .bad_tosec = { ALL_EXIT_SECTIONS, NULL },
1077 .mismatch = TEXT_TO_ANY_EXIT,
1078 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1081 .fromsec = { DATA_SECTIONS, NULL },
1082 .bad_tosec = { ALL_EXIT_SECTIONS, NULL },
1083 .mismatch = DATA_TO_ANY_EXIT,
1084 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1086 /* Do not reference init code/data from meminit code/data */
1088 .fromsec = { ALL_XXXINIT_SECTIONS, NULL },
1089 .bad_tosec = { INIT_SECTIONS, NULL },
1090 .mismatch = XXXINIT_TO_SOME_INIT,
1091 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1093 /* Do not reference exit code/data from memexit code/data */
1095 .fromsec = { ALL_XXXEXIT_SECTIONS, NULL },
1096 .bad_tosec = { EXIT_SECTIONS, NULL },
1097 .mismatch = XXXEXIT_TO_SOME_EXIT,
1098 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1100 /* Do not use exit code/data from init code */
1102 .fromsec = { ALL_INIT_SECTIONS, NULL },
1103 .bad_tosec = { ALL_EXIT_SECTIONS, NULL },
1104 .mismatch = ANY_INIT_TO_ANY_EXIT,
1105 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1107 /* Do not use init code/data from exit code */
1109 .fromsec = { ALL_EXIT_SECTIONS, NULL },
1110 .bad_tosec = { ALL_INIT_SECTIONS, NULL },
1111 .mismatch = ANY_EXIT_TO_ANY_INIT,
1112 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1115 .fromsec = { ALL_PCI_INIT_SECTIONS, NULL },
1116 .bad_tosec = { INIT_SECTIONS, NULL },
1117 .mismatch = ANY_INIT_TO_ANY_EXIT,
1118 .symbol_white_list = { NULL },
1120 /* Do not export init/exit functions or data */
1122 .fromsec = { "__ksymtab*", NULL },
1123 .bad_tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
1124 .mismatch = EXPORT_TO_INIT_EXIT,
1125 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1128 .fromsec = { "__ex_table", NULL },
1129 /* If you're adding any new black-listed sections in here, consider
1130 * adding a special 'printer' for them in scripts/check_extable.
1132 .bad_tosec = { ".altinstr_replacement", NULL },
1133 .good_tosec = {ALL_TEXT_SECTIONS , NULL},
1134 .mismatch = EXTABLE_TO_NON_TEXT,
1135 .handler = extable_mismatch_handler,
1139 static const struct sectioncheck *section_mismatch(
1140 const char *fromsec, const char *tosec)
1143 int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
1144 const struct sectioncheck *check = §ioncheck[0];
1147 * The target section could be the SHT_NUL section when we're
1148 * handling relocations to un-resolved symbols, trying to match it
1149 * doesn't make much sense and causes build failures on parisc
1155 for (i = 0; i < elems; i++) {
1156 if (match(fromsec, check->fromsec)) {
1157 if (check->bad_tosec[0] && match(tosec, check->bad_tosec))
1159 if (check->good_tosec[0] && !match(tosec, check->good_tosec))
1168 * Whitelist to allow certain references to pass with no warning.
1171 * If a module parameter is declared __initdata and permissions=0
1172 * then this is legal despite the warning generated.
1173 * We cannot see value of permissions here, so just ignore
1175 * The pattern is identified by:
1176 * tosec = .init.data
1181 * module_param_call() ops can refer to __init set function if permissions=0
1182 * The pattern is identified by:
1183 * tosec = .init.text
1185 * atsym = __param_ops_*
1188 * Many drivers utilise a *driver container with references to
1189 * add, remove, probe functions etc.
1190 * the pattern is identified by:
1191 * tosec = init or exit section
1192 * fromsec = data section
1193 * atsym = *driver, *_template, *_sht, *_ops, *_probe,
1194 * *probe_one, *_console, *_timer
1197 * Whitelist all references from .head.text to any init section
1200 * Some symbols belong to init section but still it is ok to reference
1201 * these from non-init sections as these symbols don't have any memory
1202 * allocated for them and symbol address and value are same. So even
1203 * if init section is freed, its ok to reference those symbols.
1204 * For ex. symbols marking the init section boundaries.
1205 * This pattern is identified by
1206 * refsymname = __init_begin, _sinittext, _einittext
1209 * GCC may optimize static inlines when fed constant arg(s) resulting
1210 * in functions like cpumask_empty() -- generating an associated symbol
1211 * cpumask_empty.constprop.3 that appears in the audit. If the const that
1212 * is passed in comes from __init, like say nmi_ipi_mask, we get a
1213 * meaningless section warning. May need to add isra symbols too...
1214 * This pattern is identified by
1215 * tosec = init section
1216 * fromsec = text section
1217 * refsymname = *.constprop.*
1220 * Hide section mismatch warnings for ELF local symbols. The goal
1221 * is to eliminate false positive modpost warnings caused by
1222 * compiler-generated ELF local symbol names such as ".LANCHOR1".
1223 * Autogenerated symbol names bypass modpost's "Pattern 2"
1224 * whitelisting, which relies on pattern-matching against symbol
1225 * names to work. (One situation where gcc can autogenerate ELF
1226 * local symbols is when "-fsection-anchors" is used.)
1228 static int secref_whitelist(const struct sectioncheck *mismatch,
1229 const char *fromsec, const char *fromsym,
1230 const char *tosec, const char *tosym)
1232 /* Check for pattern 1 */
1233 if (match(tosec, init_data_sections) &&
1234 match(fromsec, data_sections) &&
1235 strstarts(fromsym, "__param"))
1238 /* Check for pattern 1a */
1239 if (strcmp(tosec, ".init.text") == 0 &&
1240 match(fromsec, data_sections) &&
1241 strstarts(fromsym, "__param_ops_"))
1244 /* Check for pattern 2 */
1245 if (match(tosec, init_exit_sections) &&
1246 match(fromsec, data_sections) &&
1247 match(fromsym, mismatch->symbol_white_list))
1250 /* Check for pattern 3 */
1251 if (match(fromsec, head_sections) &&
1252 match(tosec, init_sections))
1255 /* Check for pattern 4 */
1256 if (match(tosym, linker_symbols))
1259 /* Check for pattern 5 */
1260 if (match(fromsec, text_sections) &&
1261 match(tosec, init_sections) &&
1262 match(fromsym, optim_symbols))
1265 /* Check for pattern 6 */
1266 if (strstarts(fromsym, ".L"))
1272 static inline int is_arm_mapping_symbol(const char *str)
1274 return str[0] == '$' && strchr("axtd", str[1])
1275 && (str[2] == '\0' || str[2] == '.');
1279 * If there's no name there, ignore it; likewise, ignore it if it's
1280 * one of the magic symbols emitted used by current ARM tools.
1282 * Otherwise if find_symbols_between() returns those symbols, they'll
1283 * fail the whitelist tests and cause lots of false alarms ... fixable
1284 * only by merging __exit and __init sections into __text, bloating
1285 * the kernel (which is especially evil on embedded platforms).
1287 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
1289 const char *name = elf->strtab + sym->st_name;
1291 if (!name || !strlen(name))
1293 return !is_arm_mapping_symbol(name);
1297 * Find symbol based on relocation record info.
1298 * In some cases the symbol supplied is a valid symbol so
1299 * return refsym. If st_name != 0 we assume this is a valid symbol.
1300 * In other cases the symbol needs to be looked up in the symbol table
1301 * based on section and address.
1303 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
1307 Elf_Sym *near = NULL;
1308 Elf64_Sword distance = 20;
1310 unsigned int relsym_secindex;
1312 if (relsym->st_name != 0)
1315 relsym_secindex = get_secindex(elf, relsym);
1316 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1317 if (get_secindex(elf, sym) != relsym_secindex)
1319 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
1321 if (!is_valid_name(elf, sym))
1323 if (sym->st_value == addr)
1325 /* Find a symbol nearby - addr are maybe negative */
1326 d = sym->st_value - addr;
1328 d = addr - sym->st_value;
1334 /* We need a close match */
1342 * Find symbols before or equal addr and after addr - in the section sec.
1343 * If we find two symbols with equal offset prefer one with a valid name.
1344 * The ELF format may have a better way to detect what type of symbol
1345 * it is, but this works for now.
1347 static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
1351 Elf_Sym *near = NULL;
1352 Elf_Addr distance = ~0;
1354 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1357 if (is_shndx_special(sym->st_shndx))
1359 symsec = sec_name(elf, get_secindex(elf, sym));
1360 if (strcmp(symsec, sec) != 0)
1362 if (!is_valid_name(elf, sym))
1364 if (sym->st_value <= addr) {
1365 if ((addr - sym->st_value) < distance) {
1366 distance = addr - sym->st_value;
1368 } else if ((addr - sym->st_value) == distance) {
1377 * Convert a section name to the function/data attribute
1378 * .init.text => __init
1379 * .memexitconst => __memconst
1382 * The memory of returned value has been allocated on a heap. The user of this
1383 * method should free it after usage.
1385 static char *sec2annotation(const char *s)
1387 if (match(s, init_exit_sections)) {
1388 char *p = NOFAIL(malloc(20));
1395 while (*s && *s != '.')
1400 if (strstr(s, "rodata") != NULL)
1401 strcat(p, "const ");
1402 else if (strstr(s, "data") != NULL)
1408 return NOFAIL(strdup(""));
1412 static int is_function(Elf_Sym *sym)
1415 return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
1420 static void print_section_list(const char * const list[20])
1422 const char *const *s = list;
1425 fprintf(stderr, "%s", *s);
1428 fprintf(stderr, ", ");
1430 fprintf(stderr, "\n");
1433 static inline void get_pretty_name(int is_func, const char** name, const char** name_p)
1436 case 0: *name = "variable"; *name_p = ""; break;
1437 case 1: *name = "function"; *name_p = "()"; break;
1438 default: *name = "(unknown reference)"; *name_p = ""; break;
1443 * Print a warning about a section mismatch.
1444 * Try to find symbols near it so user can find it.
1445 * Check whitelist before warning - it may be a false positive.
1447 static void report_sec_mismatch(const char *modname,
1448 const struct sectioncheck *mismatch,
1449 const char *fromsec,
1450 unsigned long long fromaddr,
1451 const char *fromsym,
1453 const char *tosec, const char *tosym,
1456 const char *from, *from_p;
1457 const char *to, *to_p;
1461 sec_mismatch_count++;
1463 get_pretty_name(from_is_func, &from, &from_p);
1464 get_pretty_name(to_is_func, &to, &to_p);
1466 warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s "
1467 "to the %s %s:%s%s\n",
1468 modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec,
1471 switch (mismatch->mismatch) {
1472 case TEXT_TO_ANY_INIT:
1473 prl_from = sec2annotation(fromsec);
1474 prl_to = sec2annotation(tosec);
1476 "The function %s%s() references\n"
1478 "This is often because %s lacks a %s\n"
1479 "annotation or the annotation of %s is wrong.\n",
1481 to, prl_to, tosym, to_p,
1482 fromsym, prl_to, tosym);
1486 case DATA_TO_ANY_INIT: {
1487 prl_to = sec2annotation(tosec);
1489 "The variable %s references\n"
1491 "If the reference is valid then annotate the\n"
1492 "variable with __init* or __refdata (see linux/init.h) "
1493 "or name the variable:\n",
1494 fromsym, to, prl_to, tosym, to_p);
1495 print_section_list(mismatch->symbol_white_list);
1499 case TEXT_TO_ANY_EXIT:
1500 prl_to = sec2annotation(tosec);
1502 "The function %s() references a %s in an exit section.\n"
1503 "Often the %s %s%s has valid usage outside the exit section\n"
1504 "and the fix is to remove the %sannotation of %s.\n",
1505 fromsym, to, to, tosym, to_p, prl_to, tosym);
1508 case DATA_TO_ANY_EXIT: {
1509 prl_to = sec2annotation(tosec);
1511 "The variable %s references\n"
1513 "If the reference is valid then annotate the\n"
1514 "variable with __exit* (see linux/init.h) or "
1515 "name the variable:\n",
1516 fromsym, to, prl_to, tosym, to_p);
1517 print_section_list(mismatch->symbol_white_list);
1521 case XXXINIT_TO_SOME_INIT:
1522 case XXXEXIT_TO_SOME_EXIT:
1523 prl_from = sec2annotation(fromsec);
1524 prl_to = sec2annotation(tosec);
1526 "The %s %s%s%s references\n"
1528 "If %s is only used by %s then\n"
1529 "annotate %s with a matching annotation.\n",
1530 from, prl_from, fromsym, from_p,
1531 to, prl_to, tosym, to_p,
1532 tosym, fromsym, tosym);
1536 case ANY_INIT_TO_ANY_EXIT:
1537 prl_from = sec2annotation(fromsec);
1538 prl_to = sec2annotation(tosec);
1540 "The %s %s%s%s references\n"
1542 "This is often seen when error handling "
1543 "in the init function\n"
1544 "uses functionality in the exit path.\n"
1545 "The fix is often to remove the %sannotation of\n"
1546 "%s%s so it may be used outside an exit section.\n",
1547 from, prl_from, fromsym, from_p,
1548 to, prl_to, tosym, to_p,
1549 prl_to, tosym, to_p);
1553 case ANY_EXIT_TO_ANY_INIT:
1554 prl_from = sec2annotation(fromsec);
1555 prl_to = sec2annotation(tosec);
1557 "The %s %s%s%s references\n"
1559 "This is often seen when error handling "
1560 "in the exit function\n"
1561 "uses functionality in the init path.\n"
1562 "The fix is often to remove the %sannotation of\n"
1563 "%s%s so it may be used outside an init section.\n",
1564 from, prl_from, fromsym, from_p,
1565 to, prl_to, tosym, to_p,
1566 prl_to, tosym, to_p);
1570 case EXPORT_TO_INIT_EXIT:
1571 prl_to = sec2annotation(tosec);
1573 "The symbol %s is exported and annotated %s\n"
1574 "Fix this by removing the %sannotation of %s "
1575 "or drop the export.\n",
1576 tosym, prl_to, prl_to, tosym);
1579 case EXTABLE_TO_NON_TEXT:
1580 fatal("There's a special handler for this mismatch type, "
1581 "we should never get here.");
1584 fprintf(stderr, "\n");
1587 static void default_mismatch_handler(const char *modname, struct elf_info *elf,
1588 const struct sectioncheck* const mismatch,
1589 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1595 const char *fromsym;
1597 from = find_elf_symbol2(elf, r->r_offset, fromsec);
1598 fromsym = sym_name(elf, from);
1600 if (strstarts(fromsym, "reference___initcall"))
1603 tosec = sec_name(elf, get_secindex(elf, sym));
1604 to = find_elf_symbol(elf, r->r_addend, sym);
1605 tosym = sym_name(elf, to);
1607 /* check whitelist - we may ignore it */
1608 if (secref_whitelist(mismatch,
1609 fromsec, fromsym, tosec, tosym)) {
1610 report_sec_mismatch(modname, mismatch,
1611 fromsec, r->r_offset, fromsym,
1612 is_function(from), tosec, tosym,
1617 static int is_executable_section(struct elf_info* elf, unsigned int section_index)
1619 if (section_index > elf->num_sections)
1620 fatal("section_index is outside elf->num_sections!\n");
1622 return ((elf->sechdrs[section_index].sh_flags & SHF_EXECINSTR) == SHF_EXECINSTR);
1626 * We rely on a gross hack in section_rel[a]() calling find_extable_entry_size()
1627 * to know the sizeof(struct exception_table_entry) for the target architecture.
1629 static unsigned int extable_entry_size = 0;
1630 static void find_extable_entry_size(const char* const sec, const Elf_Rela* r)
1633 * If we're currently checking the second relocation within __ex_table,
1634 * that relocation offset tells us the offsetof(struct
1635 * exception_table_entry, fixup) which is equal to sizeof(struct
1636 * exception_table_entry) divided by two. We use that to our advantage
1637 * since there's no portable way to get that size as every architecture
1638 * seems to go with different sized types. Not pretty but better than
1639 * hard-coding the size for every architecture..
1641 if (!extable_entry_size)
1642 extable_entry_size = r->r_offset * 2;
1645 static inline bool is_extable_fault_address(Elf_Rela *r)
1648 * extable_entry_size is only discovered after we've handled the
1649 * _second_ relocation in __ex_table, so only abort when we're not
1650 * handling the first reloc and extable_entry_size is zero.
1652 if (r->r_offset && extable_entry_size == 0)
1653 fatal("extable_entry size hasn't been discovered!\n");
1655 return ((r->r_offset == 0) ||
1656 (r->r_offset % extable_entry_size == 0));
1659 #define is_second_extable_reloc(Start, Cur, Sec) \
1660 (((Cur) == (Start) + 1) && (strcmp("__ex_table", (Sec)) == 0))
1662 static void report_extable_warnings(const char* modname, struct elf_info* elf,
1663 const struct sectioncheck* const mismatch,
1664 Elf_Rela* r, Elf_Sym* sym,
1665 const char* fromsec, const char* tosec)
1667 Elf_Sym* fromsym = find_elf_symbol2(elf, r->r_offset, fromsec);
1668 const char* fromsym_name = sym_name(elf, fromsym);
1669 Elf_Sym* tosym = find_elf_symbol(elf, r->r_addend, sym);
1670 const char* tosym_name = sym_name(elf, tosym);
1671 const char* from_pretty_name;
1672 const char* from_pretty_name_p;
1673 const char* to_pretty_name;
1674 const char* to_pretty_name_p;
1676 get_pretty_name(is_function(fromsym),
1677 &from_pretty_name, &from_pretty_name_p);
1678 get_pretty_name(is_function(tosym),
1679 &to_pretty_name, &to_pretty_name_p);
1681 warn("%s(%s+0x%lx): Section mismatch in reference"
1682 " from the %s %s%s to the %s %s:%s%s\n",
1683 modname, fromsec, (long)r->r_offset, from_pretty_name,
1684 fromsym_name, from_pretty_name_p,
1685 to_pretty_name, tosec, tosym_name, to_pretty_name_p);
1687 if (!match(tosec, mismatch->bad_tosec) &&
1688 is_executable_section(elf, get_secindex(elf, sym)))
1690 "The relocation at %s+0x%lx references\n"
1691 "section \"%s\" which is not in the list of\n"
1692 "authorized sections. If you're adding a new section\n"
1693 "and/or if this reference is valid, add \"%s\" to the\n"
1694 "list of authorized sections to jump to on fault.\n"
1695 "This can be achieved by adding \"%s\" to \n"
1696 "OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.\n",
1697 fromsec, (long)r->r_offset, tosec, tosec, tosec);
1700 static void extable_mismatch_handler(const char* modname, struct elf_info *elf,
1701 const struct sectioncheck* const mismatch,
1702 Elf_Rela* r, Elf_Sym* sym,
1703 const char *fromsec)
1705 const char* tosec = sec_name(elf, get_secindex(elf, sym));
1707 sec_mismatch_count++;
1709 report_extable_warnings(modname, elf, mismatch, r, sym, fromsec, tosec);
1711 if (match(tosec, mismatch->bad_tosec))
1712 fatal("The relocation at %s+0x%lx references\n"
1713 "section \"%s\" which is black-listed.\n"
1714 "Something is seriously wrong and should be fixed.\n"
1715 "You might get more information about where this is\n"
1716 "coming from by using scripts/check_extable.sh %s\n",
1717 fromsec, (long)r->r_offset, tosec, modname);
1718 else if (!is_executable_section(elf, get_secindex(elf, sym))) {
1719 if (is_extable_fault_address(r))
1720 fatal("The relocation at %s+0x%lx references\n"
1721 "section \"%s\" which is not executable, IOW\n"
1722 "it is not possible for the kernel to fault\n"
1723 "at that address. Something is seriously wrong\n"
1724 "and should be fixed.\n",
1725 fromsec, (long)r->r_offset, tosec);
1727 fatal("The relocation at %s+0x%lx references\n"
1728 "section \"%s\" which is not executable, IOW\n"
1729 "the kernel will fault if it ever tries to\n"
1730 "jump to it. Something is seriously wrong\n"
1731 "and should be fixed.\n",
1732 fromsec, (long)r->r_offset, tosec);
1736 static void check_section_mismatch(const char *modname, struct elf_info *elf,
1737 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1739 const char *tosec = sec_name(elf, get_secindex(elf, sym));
1740 const struct sectioncheck *mismatch = section_mismatch(fromsec, tosec);
1743 if (mismatch->handler)
1744 mismatch->handler(modname, elf, mismatch,
1747 default_mismatch_handler(modname, elf, mismatch,
1752 static unsigned int *reloc_location(struct elf_info *elf,
1753 Elf_Shdr *sechdr, Elf_Rela *r)
1755 Elf_Shdr *sechdrs = elf->sechdrs;
1756 int section = sechdr->sh_info;
1758 return (void *)elf->hdr + sechdrs[section].sh_offset +
1762 static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1764 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1765 unsigned int *location = reloc_location(elf, sechdr, r);
1769 r->r_addend = TO_NATIVE(*location);
1772 r->r_addend = TO_NATIVE(*location) + 4;
1773 /* For CONFIG_RELOCATABLE=y */
1774 if (elf->hdr->e_type == ET_EXEC)
1775 r->r_addend += r->r_offset;
1782 #define R_ARM_CALL 28
1784 #ifndef R_ARM_JUMP24
1785 #define R_ARM_JUMP24 29
1788 #ifndef R_ARM_THM_CALL
1789 #define R_ARM_THM_CALL 10
1791 #ifndef R_ARM_THM_JUMP24
1792 #define R_ARM_THM_JUMP24 30
1794 #ifndef R_ARM_THM_JUMP19
1795 #define R_ARM_THM_JUMP19 51
1798 static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1800 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1804 /* From ARM ABI: (S + A) | T */
1805 r->r_addend = (int)(long)
1806 (elf->symtab_start + ELF_R_SYM(r->r_info));
1811 case R_ARM_THM_CALL:
1812 case R_ARM_THM_JUMP24:
1813 case R_ARM_THM_JUMP19:
1814 /* From ARM ABI: ((S + A) | T) - P */
1815 r->r_addend = (int)(long)(elf->hdr +
1817 (r->r_offset - sechdr->sh_addr));
1825 static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1827 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1828 unsigned int *location = reloc_location(elf, sechdr, r);
1831 if (r_typ == R_MIPS_HI16)
1832 return 1; /* skip this */
1833 inst = TO_NATIVE(*location);
1836 r->r_addend = inst & 0xffff;
1839 r->r_addend = (inst & 0x03ffffff) << 2;
1848 static void section_rela(const char *modname, struct elf_info *elf,
1855 const char *fromsec;
1857 Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
1858 Elf_Rela *stop = (void *)start + sechdr->sh_size;
1860 fromsec = sech_name(elf, sechdr);
1861 fromsec += strlen(".rela");
1862 /* if from section (name) is know good then skip it */
1863 if (match(fromsec, section_white_list))
1866 for (rela = start; rela < stop; rela++) {
1867 r.r_offset = TO_NATIVE(rela->r_offset);
1868 #if KERNEL_ELFCLASS == ELFCLASS64
1869 if (elf->hdr->e_machine == EM_MIPS) {
1871 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
1872 r_sym = TO_NATIVE(r_sym);
1873 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1874 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1876 r.r_info = TO_NATIVE(rela->r_info);
1877 r_sym = ELF_R_SYM(r.r_info);
1880 r.r_info = TO_NATIVE(rela->r_info);
1881 r_sym = ELF_R_SYM(r.r_info);
1883 r.r_addend = TO_NATIVE(rela->r_addend);
1884 sym = elf->symtab_start + r_sym;
1885 /* Skip special sections */
1886 if (is_shndx_special(sym->st_shndx))
1888 if (is_second_extable_reloc(start, rela, fromsec))
1889 find_extable_entry_size(fromsec, &r);
1890 check_section_mismatch(modname, elf, &r, sym, fromsec);
1894 static void section_rel(const char *modname, struct elf_info *elf,
1901 const char *fromsec;
1903 Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
1904 Elf_Rel *stop = (void *)start + sechdr->sh_size;
1906 fromsec = sech_name(elf, sechdr);
1907 fromsec += strlen(".rel");
1908 /* if from section (name) is know good then skip it */
1909 if (match(fromsec, section_white_list))
1912 for (rel = start; rel < stop; rel++) {
1913 r.r_offset = TO_NATIVE(rel->r_offset);
1914 #if KERNEL_ELFCLASS == ELFCLASS64
1915 if (elf->hdr->e_machine == EM_MIPS) {
1917 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1918 r_sym = TO_NATIVE(r_sym);
1919 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1920 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1922 r.r_info = TO_NATIVE(rel->r_info);
1923 r_sym = ELF_R_SYM(r.r_info);
1926 r.r_info = TO_NATIVE(rel->r_info);
1927 r_sym = ELF_R_SYM(r.r_info);
1930 switch (elf->hdr->e_machine) {
1932 if (addend_386_rel(elf, sechdr, &r))
1936 if (addend_arm_rel(elf, sechdr, &r))
1940 if (addend_mips_rel(elf, sechdr, &r))
1944 sym = elf->symtab_start + r_sym;
1945 /* Skip special sections */
1946 if (is_shndx_special(sym->st_shndx))
1948 if (is_second_extable_reloc(start, rel, fromsec))
1949 find_extable_entry_size(fromsec, &r);
1950 check_section_mismatch(modname, elf, &r, sym, fromsec);
1955 * A module includes a number of sections that are discarded
1956 * either when loaded or when used as built-in.
1957 * For loaded modules all functions marked __init and all data
1958 * marked __initdata will be discarded when the module has been initialized.
1959 * Likewise for modules used built-in the sections marked __exit
1960 * are discarded because __exit marked function are supposed to be called
1961 * only when a module is unloaded which never happens for built-in modules.
1962 * The check_sec_ref() function traverses all relocation records
1963 * to find all references to a section that reference a section that will
1964 * be discarded and warns about it.
1966 static void check_sec_ref(struct module *mod, const char *modname,
1967 struct elf_info *elf)
1970 Elf_Shdr *sechdrs = elf->sechdrs;
1972 /* Walk through all sections */
1973 for (i = 0; i < elf->num_sections; i++) {
1974 check_section(modname, elf, &elf->sechdrs[i]);
1975 /* We want to process only relocation sections and not .init */
1976 if (sechdrs[i].sh_type == SHT_RELA)
1977 section_rela(modname, elf, &elf->sechdrs[i]);
1978 else if (sechdrs[i].sh_type == SHT_REL)
1979 section_rel(modname, elf, &elf->sechdrs[i]);
1983 static char *remove_dot(char *s)
1985 size_t n = strcspn(s, ".");
1988 size_t m = strspn(s + n + 1, "0123456789");
1989 if (m && (s[n + m] == '.' || s[n + m] == 0))
1995 static void read_symbols(const char *modname)
1997 const char *symname;
2002 struct elf_info info = { };
2005 if (!parse_elf(&info, modname))
2008 mod = new_module(modname);
2010 /* When there's no vmlinux, don't print warnings about
2011 * unresolved symbols (since there'll be too many ;) */
2012 if (is_vmlinux(modname)) {
2017 license = get_modinfo(&info, "license");
2018 if (!license && !is_vmlinux(modname))
2019 warn("missing MODULE_LICENSE() in %s\n"
2020 "see include/linux/module.h for "
2021 "more information\n", modname);
2023 if (license_is_gpl_compatible(license))
2024 mod->gpl_compatible = 1;
2026 mod->gpl_compatible = 0;
2029 license = get_next_modinfo(&info, "license", license);
2032 namespace = get_modinfo(&info, "import_ns");
2034 add_namespace(&mod->imported_namespaces, namespace);
2035 namespace = get_next_modinfo(&info, "import_ns", namespace);
2038 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
2039 symname = remove_dot(info.strtab + sym->st_name);
2041 handle_symbol(mod, &info, sym, symname);
2042 handle_moddevtable(mod, &info, sym, symname);
2045 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
2046 symname = remove_dot(info.strtab + sym->st_name);
2048 /* Apply symbol namespaces from __kstrtabns_<symbol> entries. */
2049 if (strstarts(symname, "__kstrtabns_"))
2050 sym_update_namespace(symname + strlen("__kstrtabns_"),
2051 namespace_from_kstrtabns(&info,
2054 if (strstarts(symname, "__crc_"))
2055 handle_modversion(mod, &info, sym,
2056 symname + strlen("__crc_"));
2059 // check for static EXPORT_SYMBOL_* functions && global vars
2060 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
2061 unsigned char bind = ELF_ST_BIND(sym->st_info);
2063 if (bind == STB_GLOBAL || bind == STB_WEAK) {
2065 find_symbol(remove_dot(info.strtab +
2073 if (!is_vmlinux(modname) || vmlinux_section_warnings)
2074 check_sec_ref(mod, modname, &info);
2076 version = get_modinfo(&info, "version");
2078 maybe_frob_rcs_version(modname, version, info.modinfo,
2079 version - (char *)info.hdr);
2080 if (version || (all_versions && !is_vmlinux(modname)))
2081 get_src_version(modname, mod->srcversion,
2082 sizeof(mod->srcversion)-1);
2084 parse_elf_finish(&info);
2086 /* Our trick to get versioning for module struct etc. - it's
2087 * never passed as an argument to an exported function, so
2088 * the automatic versioning doesn't pick it up, but it's really
2089 * important anyhow */
2091 mod->unres = alloc_symbol("module_layout", 0, mod->unres);
2094 static void read_symbols_from_files(const char *filename)
2097 char fname[PATH_MAX];
2099 if (strcmp(filename, "-") != 0) {
2100 in = fopen(filename, "r");
2102 fatal("Can't open filenames file %s: %m", filename);
2105 while (fgets(fname, PATH_MAX, in) != NULL) {
2106 if (strends(fname, "\n"))
2107 fname[strlen(fname)-1] = '\0';
2108 read_symbols(fname);
2117 /* We first write the generated file into memory using the
2118 * following helper, then compare to the file on disk and
2119 * only update the later if anything changed */
2121 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
2122 const char *fmt, ...)
2129 len = vsnprintf(tmp, SZ, fmt, ap);
2130 buf_write(buf, tmp, len);
2134 void buf_write(struct buffer *buf, const char *s, int len)
2136 if (buf->size - buf->pos < len) {
2137 buf->size += len + SZ;
2138 buf->p = NOFAIL(realloc(buf->p, buf->size));
2140 strncpy(buf->p + buf->pos, s, len);
2144 static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
2146 const char *e = is_vmlinux(m) ?"":".ko";
2150 fatal("GPL-incompatible module %s%s "
2151 "uses GPL-only symbol '%s'\n", m, e, s);
2153 case export_unused_gpl:
2154 fatal("GPL-incompatible module %s%s "
2155 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
2157 case export_gpl_future:
2158 warn("GPL-incompatible module %s%s "
2159 "uses future GPL-only symbol '%s'\n", m, e, s);
2163 case export_unknown:
2169 static void check_for_unused(enum export exp, const char *m, const char *s)
2171 const char *e = is_vmlinux(m) ?"":".ko";
2175 case export_unused_gpl:
2177 "uses symbol '%s' marked UNUSED\n", m, e, s);
2185 static int check_exports(struct module *mod)
2187 struct symbol *s, *exp;
2190 for (s = mod->unres; s; s = s->next) {
2191 const char *basename;
2192 exp = find_symbol(s->name);
2193 if (!exp || exp->module == mod) {
2194 if (have_vmlinux && !s->weak) {
2195 modpost_log(warn_unresolved ? LOG_WARN : LOG_ERROR,
2196 "\"%s\" [%s.ko] undefined!\n",
2197 s->name, mod->name);
2198 if (!warn_unresolved)
2203 basename = strrchr(mod->name, '/');
2207 basename = mod->name;
2209 if (exp->namespace &&
2210 !module_imports_namespace(mod, exp->namespace)) {
2211 modpost_log(allow_missing_ns_imports ? LOG_WARN : LOG_ERROR,
2212 "module %s uses symbol %s from namespace %s, but does not import it.\n",
2213 basename, exp->name, exp->namespace);
2214 if (!allow_missing_ns_imports)
2216 add_namespace(&mod->missing_namespaces, exp->namespace);
2219 if (!mod->gpl_compatible)
2220 check_for_gpl_usage(exp->export, basename, exp->name);
2221 check_for_unused(exp->export, basename, exp->name);
2227 static int check_modname_len(struct module *mod)
2229 const char *mod_name;
2231 mod_name = strrchr(mod->name, '/');
2232 if (mod_name == NULL)
2233 mod_name = mod->name;
2236 if (strlen(mod_name) >= MODULE_NAME_LEN) {
2237 merror("module name is too long [%s.ko]\n", mod->name);
2245 * Header for the generated file
2247 static void add_header(struct buffer *b, struct module *mod)
2249 buf_printf(b, "#include <linux/module.h>\n");
2251 * Include build-salt.h after module.h in order to
2252 * inherit the definitions.
2254 buf_printf(b, "#include <linux/build-salt.h>\n");
2255 buf_printf(b, "#include <linux/vermagic.h>\n");
2256 buf_printf(b, "#include <linux/compiler.h>\n");
2257 buf_printf(b, "\n");
2258 buf_printf(b, "BUILD_SALT;\n");
2259 buf_printf(b, "\n");
2260 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
2261 buf_printf(b, "MODULE_INFO(name, KBUILD_MODNAME);\n");
2262 buf_printf(b, "\n");
2263 buf_printf(b, "__visible struct module __this_module\n");
2264 buf_printf(b, "__section(.gnu.linkonce.this_module) = {\n");
2265 buf_printf(b, "\t.name = KBUILD_MODNAME,\n");
2267 buf_printf(b, "\t.init = init_module,\n");
2268 if (mod->has_cleanup)
2269 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
2270 "\t.exit = cleanup_module,\n"
2272 buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n");
2273 buf_printf(b, "};\n");
2276 static void add_intree_flag(struct buffer *b, int is_intree)
2279 buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n");
2282 /* Cannot check for assembler */
2283 static void add_retpoline(struct buffer *b)
2285 buf_printf(b, "\n#ifdef CONFIG_RETPOLINE\n");
2286 buf_printf(b, "MODULE_INFO(retpoline, \"Y\");\n");
2287 buf_printf(b, "#endif\n");
2290 static void add_staging_flag(struct buffer *b, const char *name)
2292 if (strstarts(name, "drivers/staging"))
2293 buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
2297 * Record CRCs for unresolved symbols
2299 static int add_versions(struct buffer *b, struct module *mod)
2301 struct symbol *s, *exp;
2304 for (s = mod->unres; s; s = s->next) {
2305 exp = find_symbol(s->name);
2306 if (!exp || exp->module == mod)
2308 s->module = exp->module;
2309 s->crc_valid = exp->crc_valid;
2316 buf_printf(b, "\n");
2317 buf_printf(b, "static const struct modversion_info ____versions[]\n");
2318 buf_printf(b, "__used __section(__versions) = {\n");
2320 for (s = mod->unres; s; s = s->next) {
2323 if (!s->crc_valid) {
2324 warn("\"%s\" [%s.ko] has no CRC!\n",
2325 s->name, mod->name);
2328 if (strlen(s->name) >= MODULE_NAME_LEN) {
2329 merror("too long symbol \"%s\" [%s.ko]\n",
2330 s->name, mod->name);
2334 buf_printf(b, "\t{ %#8x, \"%s\" },\n",
2338 buf_printf(b, "};\n");
2343 static void add_depends(struct buffer *b, struct module *mod)
2348 /* Clear ->seen flag of modules that own symbols needed by this. */
2349 for (s = mod->unres; s; s = s->next)
2351 s->module->seen = is_vmlinux(s->module->name);
2353 buf_printf(b, "\n");
2354 buf_printf(b, "MODULE_INFO(depends, \"");
2355 for (s = mod->unres; s; s = s->next) {
2360 if (s->module->seen)
2363 s->module->seen = 1;
2364 p = strrchr(s->module->name, '/');
2368 p = s->module->name;
2369 buf_printf(b, "%s%s", first ? "" : ",", p);
2372 buf_printf(b, "\");\n");
2375 static void add_srcversion(struct buffer *b, struct module *mod)
2377 if (mod->srcversion[0]) {
2378 buf_printf(b, "\n");
2379 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
2384 static void write_if_changed(struct buffer *b, const char *fname)
2390 file = fopen(fname, "r");
2394 if (fstat(fileno(file), &st) < 0)
2397 if (st.st_size != b->pos)
2400 tmp = NOFAIL(malloc(b->pos));
2401 if (fread(tmp, 1, b->pos, file) != b->pos)
2404 if (memcmp(tmp, b->p, b->pos) != 0)
2416 file = fopen(fname, "w");
2421 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
2428 /* parse Module.symvers file. line format:
2429 * 0x12345678<tab>symbol<tab>module<tab>export<tab>namespace
2431 static void read_dump(const char *fname, unsigned int kernel)
2433 unsigned long size, pos = 0;
2434 void *file = grab_file(fname, &size);
2438 /* No symbol versions, silently ignore */
2441 while ((line = get_next_line(&pos, file, size))) {
2442 char *symname, *namespace, *modname, *d, *export;
2447 if (!(symname = strchr(line, '\t')))
2450 if (!(modname = strchr(symname, '\t')))
2453 if (!(export = strchr(modname, '\t')))
2456 if (!(namespace = strchr(export, '\t')))
2458 *namespace++ = '\0';
2460 crc = strtoul(line, &d, 16);
2461 if (*symname == '\0' || *modname == '\0' || *d != '\0')
2463 mod = find_module(modname);
2465 if (is_vmlinux(modname))
2467 mod = new_module(modname);
2470 s = sym_add_exported(symname, mod, export_no(export));
2473 sym_set_crc(symname, crc);
2474 sym_update_namespace(symname, namespace);
2476 release_file(file, size);
2479 release_file(file, size);
2480 fatal("parse error in symbol dump file\n");
2483 /* For normal builds always dump all symbols.
2484 * For external modules only dump symbols
2485 * that are not read from kernel Module.symvers.
2487 static int dump_sym(struct symbol *sym)
2489 if (!external_module)
2491 if (sym->vmlinux || sym->kernel)
2496 static void write_dump(const char *fname)
2498 struct buffer buf = { };
2499 struct symbol *symbol;
2500 const char *namespace;
2503 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
2504 symbol = symbolhash[n];
2506 if (dump_sym(symbol)) {
2507 namespace = symbol->namespace;
2508 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\t%s\n",
2509 symbol->crc, symbol->name,
2510 symbol->module->name,
2511 export_str(symbol->export),
2512 namespace ? namespace : "");
2514 symbol = symbol->next;
2517 write_if_changed(&buf, fname);
2521 static void write_namespace_deps_files(const char *fname)
2524 struct namespace_list *ns;
2525 struct buffer ns_deps_buf = {};
2527 for (mod = modules; mod; mod = mod->next) {
2529 if (mod->skip || !mod->missing_namespaces)
2532 buf_printf(&ns_deps_buf, "%s.ko:", mod->name);
2534 for (ns = mod->missing_namespaces; ns; ns = ns->next)
2535 buf_printf(&ns_deps_buf, " %s", ns->namespace);
2537 buf_printf(&ns_deps_buf, "\n");
2540 write_if_changed(&ns_deps_buf, fname);
2541 free(ns_deps_buf.p);
2544 struct ext_sym_list {
2545 struct ext_sym_list *next;
2549 int main(int argc, char **argv)
2552 struct buffer buf = { };
2553 char *kernel_read = NULL;
2554 char *missing_namespace_deps = NULL;
2555 char *dump_write = NULL, *files_source = NULL;
2559 struct ext_sym_list *extsym_iter;
2560 struct ext_sym_list *extsym_start = NULL;
2562 while ((opt = getopt(argc, argv, "i:e:mnsT:o:awENd:")) != -1) {
2565 kernel_read = optarg;
2566 external_module = 1;
2569 external_module = 1;
2571 NOFAIL(malloc(sizeof(*extsym_iter)));
2572 extsym_iter->next = extsym_start;
2573 extsym_iter->file = optarg;
2574 extsym_start = extsym_iter;
2580 ignore_missing_files = 1;
2583 dump_write = optarg;
2589 vmlinux_section_warnings = 0;
2592 files_source = optarg;
2595 warn_unresolved = 1;
2598 sec_mismatch_fatal = 1;
2601 allow_missing_ns_imports = 1;
2604 missing_namespace_deps = optarg;
2612 read_dump(kernel_read, 1);
2613 while (extsym_start) {
2614 read_dump(extsym_start->file, 0);
2615 extsym_iter = extsym_start->next;
2617 extsym_start = extsym_iter;
2620 while (optind < argc)
2621 read_symbols(argv[optind++]);
2624 read_symbols_from_files(files_source);
2628 for (mod = modules; mod; mod = mod->next) {
2629 char fname[PATH_MAX];
2636 err |= check_modname_len(mod);
2637 err |= check_exports(mod);
2639 add_header(&buf, mod);
2640 add_intree_flag(&buf, !external_module);
2641 add_retpoline(&buf);
2642 add_staging_flag(&buf, mod->name);
2643 err |= add_versions(&buf, mod);
2644 add_depends(&buf, mod);
2645 add_moddevtable(&buf, mod);
2646 add_srcversion(&buf, mod);
2648 sprintf(fname, "%s.mod.c", mod->name);
2649 write_if_changed(&buf, fname);
2652 if (missing_namespace_deps)
2653 write_namespace_deps_files(missing_namespace_deps);
2656 write_dump(dump_write);
2657 if (sec_mismatch_count && sec_mismatch_fatal)
2658 fatal("Section mismatches detected.\n"
2659 "Set CONFIG_SECTION_MISMATCH_WARN_ONLY=y to allow them.\n");
2660 for (n = 0; n < SYMBOL_HASH_SIZE; n++) {
2663 for (s = symbolhash[n]; s; s = s->next) {
2665 * Do not check "vmlinux". This avoids the same warnings
2666 * shown twice, and false-positives for ARCH=um.
2668 if (is_vmlinux(s->module->name) && !s->module->is_dot_o)
2672 warn("\"%s\" [%s] is a static %s\n",
2673 s->name, s->module->name,
2674 export_str(s->export));