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 ...
22 #include "../../include/linux/license.h"
24 /* Are we using CONFIG_MODVERSIONS? */
25 static int modversions = 0;
26 /* Warn about undefined symbols? (do so if we have vmlinux) */
27 static int have_vmlinux = 0;
28 /* Is CONFIG_MODULE_SRCVERSION_ALL set? */
29 static int all_versions = 0;
30 /* If we are modposting external module set to 1 */
31 static int external_module = 0;
32 /* Warn about section mismatch in vmlinux if set to 1 */
33 static int vmlinux_section_warnings = 1;
34 /* Only warn about unresolved symbols */
35 static int warn_unresolved = 0;
36 /* How a symbol is exported */
37 static int sec_mismatch_count = 0;
38 static int sec_mismatch_fatal = 0;
39 /* ignore missing files */
40 static int ignore_missing_files;
41 /* write namespace dependencies */
42 static int write_namespace_deps;
45 export_plain, export_unused, export_gpl,
46 export_unused_gpl, export_gpl_future, export_unknown
49 /* In kernel, this size is defined in linux/module.h;
50 * here we use Elf_Addr instead of long for covering cross-compile
53 #define MODULE_NAME_LEN (64 - sizeof(Elf_Addr))
55 #define PRINTF __attribute__ ((format (printf, 1, 2)))
57 PRINTF void fatal(const char *fmt, ...)
61 fprintf(stderr, "FATAL: ");
63 va_start(arglist, fmt);
64 vfprintf(stderr, fmt, arglist);
70 PRINTF void warn(const char *fmt, ...)
74 fprintf(stderr, "WARNING: ");
76 va_start(arglist, fmt);
77 vfprintf(stderr, fmt, arglist);
81 PRINTF void merror(const char *fmt, ...)
85 fprintf(stderr, "ERROR: ");
87 va_start(arglist, fmt);
88 vfprintf(stderr, fmt, arglist);
92 static inline bool strends(const char *str, const char *postfix)
94 if (strlen(str) < strlen(postfix))
97 return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
100 static int is_vmlinux(const char *modname)
104 myname = strrchr(modname, '/');
110 return (strcmp(myname, "vmlinux") == 0) ||
111 (strcmp(myname, "vmlinux.o") == 0);
114 void *do_nofail(void *ptr, const char *expr)
117 fatal("modpost: Memory allocation failure: %s.\n", expr);
122 /* A list of all modules we processed */
123 static struct module *modules;
125 static struct module *find_module(const char *modname)
129 for (mod = modules; mod; mod = mod->next)
130 if (strcmp(mod->name, modname) == 0)
135 static struct module *new_module(const char *modname)
140 mod = NOFAIL(malloc(sizeof(*mod)));
141 memset(mod, 0, sizeof(*mod));
142 p = NOFAIL(strdup(modname));
144 /* strip trailing .o */
145 if (strends(p, ".o")) {
146 p[strlen(p) - 2] = '\0';
152 mod->gpl_compatible = -1;
159 /* A hash of all exported symbols,
160 * struct symbol is also used for lists of unresolved symbols */
162 #define SYMBOL_HASH_SIZE 1024
166 struct module *module;
171 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
172 unsigned int kernel:1; /* 1 if symbol is from kernel
173 * (only for external modules) **/
174 unsigned int preloaded:1; /* 1 if symbol from Module.symvers, or crc */
175 unsigned int is_static:1; /* 1 if symbol is not global */
176 enum export export; /* Type of export */
180 static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
182 /* This is based on the hash agorithm from gdbm, via tdb */
183 static inline unsigned int tdb_hash(const char *name)
185 unsigned value; /* Used to compute the hash value. */
186 unsigned i; /* Used to cycle through random values. */
188 /* Set the initial value from the key size. */
189 for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
190 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
192 return (1103515243 * value + 12345);
196 * Allocate a new symbols for use in the hash of exported symbols or
197 * the list of unresolved symbols per module
199 static struct symbol *alloc_symbol(const char *name, unsigned int weak,
202 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
204 memset(s, 0, sizeof(*s));
205 strcpy(s->name, name);
212 /* For the hash of exported symbols */
213 static struct symbol *new_symbol(const char *name, struct module *module,
219 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
220 new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
221 new->module = module;
222 new->export = export;
226 static struct symbol *find_symbol(const char *name)
230 /* For our purposes, .foo matches foo. PPC64 needs this. */
234 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
235 if (strcmp(s->name, name) == 0)
241 static bool contains_namespace(struct namespace_list *list,
242 const char *namespace)
244 struct namespace_list *ns_entry;
246 for (ns_entry = list; ns_entry != NULL; ns_entry = ns_entry->next)
247 if (strcmp(ns_entry->namespace, namespace) == 0)
253 static void add_namespace(struct namespace_list **list, const char *namespace)
255 struct namespace_list *ns_entry;
257 if (!contains_namespace(*list, namespace)) {
258 ns_entry = NOFAIL(malloc(sizeof(struct namespace_list) +
259 strlen(namespace) + 1));
260 strcpy(ns_entry->namespace, namespace);
261 ns_entry->next = *list;
266 static bool module_imports_namespace(struct module *module,
267 const char *namespace)
269 return contains_namespace(module->imported_namespaces, namespace);
272 static const struct {
276 { .str = "EXPORT_SYMBOL", .export = export_plain },
277 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
278 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
279 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
280 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
281 { .str = "(unknown)", .export = export_unknown },
285 static const char *export_str(enum export ex)
287 return export_list[ex].str;
290 static enum export export_no(const char *s)
295 return export_unknown;
296 for (i = 0; export_list[i].export != export_unknown; i++) {
297 if (strcmp(export_list[i].str, s) == 0)
298 return export_list[i].export;
300 return export_unknown;
303 static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
305 return (void *)elf->hdr +
306 elf->sechdrs[elf->secindex_strings].sh_offset +
310 static const char *sec_name(struct elf_info *elf, int secindex)
312 return sech_name(elf, &elf->sechdrs[secindex]);
315 #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
317 static enum export export_from_secname(struct elf_info *elf, unsigned int sec)
319 const char *secname = sec_name(elf, sec);
321 if (strstarts(secname, "___ksymtab+"))
323 else if (strstarts(secname, "___ksymtab_unused+"))
324 return export_unused;
325 else if (strstarts(secname, "___ksymtab_gpl+"))
327 else if (strstarts(secname, "___ksymtab_unused_gpl+"))
328 return export_unused_gpl;
329 else if (strstarts(secname, "___ksymtab_gpl_future+"))
330 return export_gpl_future;
332 return export_unknown;
335 static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
337 if (sec == elf->export_sec)
339 else if (sec == elf->export_unused_sec)
340 return export_unused;
341 else if (sec == elf->export_gpl_sec)
343 else if (sec == elf->export_unused_gpl_sec)
344 return export_unused_gpl;
345 else if (sec == elf->export_gpl_future_sec)
346 return export_gpl_future;
348 return export_unknown;
351 static char *sym_extract_namespace(const char **symname)
353 char *namespace = NULL;
356 ns_separator = strchr(*symname, '.');
358 namespace = NOFAIL(strndup(*symname, ns_separator - *symname));
359 *symname = ns_separator + 1;
366 * Add an exported symbol - it may have already been added without a
367 * CRC, in this case just update the CRC
369 static struct symbol *sym_add_exported(const char *name, const char *namespace,
370 struct module *mod, enum export export)
372 struct symbol *s = find_symbol(name);
375 s = new_symbol(name, mod, export);
378 warn("%s: '%s' exported twice. Previous export was in %s%s\n",
379 mod->name, name, s->module->name,
380 is_vmlinux(s->module->name) ? "" : ".ko");
382 /* In case Module.symvers was out of date */
387 s->namespace = namespace ? strdup(namespace) : NULL;
389 s->vmlinux = is_vmlinux(mod->name);
395 static void sym_update_crc(const char *name, struct module *mod,
396 unsigned int crc, enum export export)
398 struct symbol *s = find_symbol(name);
401 s = new_symbol(name, mod, export);
402 /* Don't complain when we find it later. */
409 void *grab_file(const char *filename, unsigned long *size)
412 void *map = MAP_FAILED;
415 fd = open(filename, O_RDONLY);
422 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
426 if (map == MAP_FAILED)
432 * Return a copy of the next line in a mmap'ed file.
433 * spaces in the beginning of the line is trimmed away.
434 * Return a pointer to a static buffer.
436 char *get_next_line(unsigned long *pos, void *file, unsigned long size)
438 static char line[4096];
441 signed char *p = (signed char *)file + *pos;
444 for (; *pos < size ; (*pos)++) {
445 if (skip && isspace(*p)) {
450 if (*p != '\n' && (*pos < size)) {
454 break; /* Too long, stop */
465 void release_file(void *file, unsigned long size)
470 static int parse_elf(struct elf_info *info, const char *filename)
476 const char *secstrings;
477 unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;
479 hdr = grab_file(filename, &info->size);
481 if (ignore_missing_files) {
482 fprintf(stderr, "%s: %s (ignored)\n", filename,
490 if (info->size < sizeof(*hdr)) {
491 /* file too small, assume this is an empty .o file */
494 /* Is this a valid ELF file? */
495 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
496 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
497 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
498 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
499 /* Not an ELF file - silently ignore it */
502 /* Fix endianness in ELF header */
503 hdr->e_type = TO_NATIVE(hdr->e_type);
504 hdr->e_machine = TO_NATIVE(hdr->e_machine);
505 hdr->e_version = TO_NATIVE(hdr->e_version);
506 hdr->e_entry = TO_NATIVE(hdr->e_entry);
507 hdr->e_phoff = TO_NATIVE(hdr->e_phoff);
508 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
509 hdr->e_flags = TO_NATIVE(hdr->e_flags);
510 hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize);
511 hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize);
512 hdr->e_phnum = TO_NATIVE(hdr->e_phnum);
513 hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize);
514 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
515 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
516 sechdrs = (void *)hdr + hdr->e_shoff;
517 info->sechdrs = sechdrs;
519 /* Check if file offset is correct */
520 if (hdr->e_shoff > info->size) {
521 fatal("section header offset=%lu in file '%s' is bigger than "
522 "filesize=%lu\n", (unsigned long)hdr->e_shoff,
523 filename, info->size);
527 if (hdr->e_shnum == SHN_UNDEF) {
529 * There are more than 64k sections,
530 * read count from .sh_size.
532 info->num_sections = TO_NATIVE(sechdrs[0].sh_size);
535 info->num_sections = hdr->e_shnum;
537 if (hdr->e_shstrndx == SHN_XINDEX) {
538 info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link);
541 info->secindex_strings = hdr->e_shstrndx;
544 /* Fix endianness in section headers */
545 for (i = 0; i < info->num_sections; i++) {
546 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
547 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
548 sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags);
549 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
550 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
551 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
552 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
553 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
554 sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign);
555 sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize);
557 /* Find symbol table. */
558 secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset;
559 for (i = 1; i < info->num_sections; i++) {
561 int nobits = sechdrs[i].sh_type == SHT_NOBITS;
563 if (!nobits && sechdrs[i].sh_offset > info->size) {
564 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
565 "sizeof(*hrd)=%zu\n", filename,
566 (unsigned long)sechdrs[i].sh_offset,
570 secname = secstrings + sechdrs[i].sh_name;
571 if (strcmp(secname, ".modinfo") == 0) {
573 fatal("%s has NOBITS .modinfo\n", filename);
574 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
575 info->modinfo_len = sechdrs[i].sh_size;
576 } else if (strcmp(secname, "__ksymtab") == 0)
577 info->export_sec = i;
578 else if (strcmp(secname, "__ksymtab_unused") == 0)
579 info->export_unused_sec = i;
580 else if (strcmp(secname, "__ksymtab_gpl") == 0)
581 info->export_gpl_sec = i;
582 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
583 info->export_unused_gpl_sec = i;
584 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
585 info->export_gpl_future_sec = i;
587 if (sechdrs[i].sh_type == SHT_SYMTAB) {
588 unsigned int sh_link_idx;
590 info->symtab_start = (void *)hdr +
591 sechdrs[i].sh_offset;
592 info->symtab_stop = (void *)hdr +
593 sechdrs[i].sh_offset + sechdrs[i].sh_size;
594 sh_link_idx = sechdrs[i].sh_link;
595 info->strtab = (void *)hdr +
596 sechdrs[sh_link_idx].sh_offset;
599 /* 32bit section no. table? ("more than 64k sections") */
600 if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
601 symtab_shndx_idx = i;
602 info->symtab_shndx_start = (void *)hdr +
603 sechdrs[i].sh_offset;
604 info->symtab_shndx_stop = (void *)hdr +
605 sechdrs[i].sh_offset + sechdrs[i].sh_size;
608 if (!info->symtab_start)
609 fatal("%s has no symtab?\n", filename);
611 /* Fix endianness in symbols */
612 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
613 sym->st_shndx = TO_NATIVE(sym->st_shndx);
614 sym->st_name = TO_NATIVE(sym->st_name);
615 sym->st_value = TO_NATIVE(sym->st_value);
616 sym->st_size = TO_NATIVE(sym->st_size);
619 if (symtab_shndx_idx != ~0U) {
621 if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link)
622 fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
623 filename, sechdrs[symtab_shndx_idx].sh_link,
626 for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
634 static void parse_elf_finish(struct elf_info *info)
636 release_file(info->hdr, info->size);
639 static int ignore_undef_symbol(struct elf_info *info, const char *symname)
641 /* ignore __this_module, it will be resolved shortly */
642 if (strcmp(symname, "__this_module") == 0)
644 /* ignore global offset table */
645 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
647 if (info->hdr->e_machine == EM_PPC)
648 /* Special register function linked on all modules during final link of .ko */
649 if (strstarts(symname, "_restgpr_") ||
650 strstarts(symname, "_savegpr_") ||
651 strstarts(symname, "_rest32gpr_") ||
652 strstarts(symname, "_save32gpr_") ||
653 strstarts(symname, "_restvr_") ||
654 strstarts(symname, "_savevr_"))
656 if (info->hdr->e_machine == EM_PPC64)
657 /* Special register function linked on all modules during final link of .ko */
658 if (strstarts(symname, "_restgpr0_") ||
659 strstarts(symname, "_savegpr0_") ||
660 strstarts(symname, "_restvr_") ||
661 strstarts(symname, "_savevr_") ||
662 strcmp(symname, ".TOC.") == 0)
664 /* Do not ignore this symbol */
668 static void handle_modversions(struct module *mod, struct elf_info *info,
669 Elf_Sym *sym, const char *symname)
677 if ((!is_vmlinux(mod->name) || mod->is_dot_o) &&
678 strstarts(symname, "__ksymtab"))
679 export = export_from_secname(info, get_secindex(info, sym));
681 export = export_from_sec(info, get_secindex(info, sym));
684 if (strstarts(symname, "__crc_")) {
686 crc = (unsigned int) sym->st_value;
687 if (sym->st_shndx != SHN_UNDEF && sym->st_shndx != SHN_ABS) {
690 /* symbol points to the CRC in the ELF object */
691 crcp = (void *)info->hdr + sym->st_value +
692 info->sechdrs[sym->st_shndx].sh_offset -
693 (info->hdr->e_type != ET_REL ?
694 info->sechdrs[sym->st_shndx].sh_addr : 0);
695 crc = TO_NATIVE(*crcp);
697 sym_update_crc(symname + strlen("__crc_"), mod, crc,
701 switch (sym->st_shndx) {
703 if (strstarts(symname, "__gnu_lto_")) {
704 /* Should warn here, but modpost runs before the linker */
706 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
709 /* undefined symbol */
710 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
711 ELF_ST_BIND(sym->st_info) != STB_WEAK)
713 if (ignore_undef_symbol(info, symname))
715 /* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
716 #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
717 /* add compatibility with older glibc */
718 #ifndef STT_SPARC_REGISTER
719 #define STT_SPARC_REGISTER STT_REGISTER
721 if (info->hdr->e_machine == EM_SPARC ||
722 info->hdr->e_machine == EM_SPARCV9) {
723 /* Ignore register directives. */
724 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
726 if (symname[0] == '.') {
727 char *munged = NOFAIL(strdup(symname));
729 munged[1] = toupper(munged[1]);
736 const char *e = is_vmlinux(mod->name) ?"":".ko";
737 warn("EXPORT symbol \"%s\" [%s%s] version generation failed, symbol will not be versioned.\n",
738 symname + strlen("__crc_"), mod->name, e);
740 mod->unres = alloc_symbol(symname,
741 ELF_ST_BIND(sym->st_info) == STB_WEAK,
745 /* All exported symbols */
746 if (strstarts(symname, "__ksymtab_")) {
747 name = symname + strlen("__ksymtab_");
748 namespace = sym_extract_namespace(&name);
749 sym_add_exported(name, namespace, mod, export);
752 if (strcmp(symname, "init_module") == 0)
754 if (strcmp(symname, "cleanup_module") == 0)
755 mod->has_cleanup = 1;
761 * Parse tag=value strings from .modinfo section
763 static char *next_string(char *string, unsigned long *secsize)
765 /* Skip non-zero chars */
768 if ((*secsize)-- <= 1)
772 /* Skip any zero padding. */
775 if ((*secsize)-- <= 1)
781 static char *get_next_modinfo(struct elf_info *info, const char *tag,
785 unsigned int taglen = strlen(tag);
786 char *modinfo = info->modinfo;
787 unsigned long size = info->modinfo_len;
790 size -= prev - modinfo;
791 modinfo = next_string(prev, &size);
794 for (p = modinfo; p; p = next_string(p, &size)) {
795 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
796 return p + taglen + 1;
801 static char *get_modinfo(struct elf_info *info, const char *tag)
804 return get_next_modinfo(info, tag, NULL);
808 * Test if string s ends in string sub
811 static int strrcmp(const char *s, const char *sub)
819 sublen = strlen(sub);
821 if ((slen == 0) || (sublen == 0))
827 return memcmp(s + slen - sublen, sub, sublen);
830 static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
833 return elf->strtab + sym->st_name;
838 /* The pattern is an array of simple patterns.
839 * "foo" will match an exact string equal to "foo"
840 * "*foo" will match a string that ends with "foo"
841 * "foo*" will match a string that begins with "foo"
842 * "*foo*" will match a string that contains "foo"
844 static int match(const char *sym, const char * const pat[])
849 const char *endp = p + strlen(p) - 1;
852 if (*p == '*' && *endp == '*') {
853 char *bare = NOFAIL(strndup(p + 1, strlen(p) - 2));
854 char *here = strstr(sym, bare);
861 else if (*p == '*') {
862 if (strrcmp(sym, p + 1) == 0)
866 else if (*endp == '*') {
867 if (strncmp(sym, p, strlen(p) - 1) == 0)
872 if (strcmp(p, sym) == 0)
880 /* sections that we do not want to do full section mismatch check on */
881 static const char *const section_white_list[] =
885 ".cranges", /* sh64 */
886 ".zdebug*", /* Compressed debug sections. */
887 ".GCC.command.line", /* record-gcc-switches */
888 ".mdebug*", /* alpha, score, mips etc. */
889 ".pdr", /* alpha, score, mips etc. */
894 ".xt.prop", /* xtensa */
895 ".xt.lit", /* xtensa */
896 ".arcextmap*", /* arc */
897 ".gnu.linkonce.arcext*", /* arc : modules */
898 ".cmem*", /* EZchip */
899 ".fmt_slot*", /* EZchip */
906 * This is used to find sections missing the SHF_ALLOC flag.
907 * The cause of this is often a section specified in assembler
908 * without "ax" / "aw".
910 static void check_section(const char *modname, struct elf_info *elf,
913 const char *sec = sech_name(elf, sechdr);
915 if (sechdr->sh_type == SHT_PROGBITS &&
916 !(sechdr->sh_flags & SHF_ALLOC) &&
917 !match(sec, section_white_list)) {
918 warn("%s (%s): unexpected non-allocatable section.\n"
919 "Did you forget to use \"ax\"/\"aw\" in a .S file?\n"
920 "Note that for example <linux/init.h> contains\n"
921 "section definitions for use in .S files.\n\n",
928 #define ALL_INIT_DATA_SECTIONS \
929 ".init.setup", ".init.rodata", ".meminit.rodata", \
930 ".init.data", ".meminit.data"
931 #define ALL_EXIT_DATA_SECTIONS \
932 ".exit.data", ".memexit.data"
934 #define ALL_INIT_TEXT_SECTIONS \
935 ".init.text", ".meminit.text"
936 #define ALL_EXIT_TEXT_SECTIONS \
937 ".exit.text", ".memexit.text"
939 #define ALL_PCI_INIT_SECTIONS \
940 ".pci_fixup_early", ".pci_fixup_header", ".pci_fixup_final", \
941 ".pci_fixup_enable", ".pci_fixup_resume", \
942 ".pci_fixup_resume_early", ".pci_fixup_suspend"
944 #define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS
945 #define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS
947 #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
948 #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
950 #define DATA_SECTIONS ".data", ".data.rel"
951 #define TEXT_SECTIONS ".text", ".text.unlikely", ".sched.text", \
952 ".kprobes.text", ".cpuidle.text"
953 #define OTHER_TEXT_SECTIONS ".ref.text", ".head.text", ".spinlock.text", \
954 ".fixup", ".entry.text", ".exception.text", ".text.*", \
957 #define INIT_SECTIONS ".init.*"
958 #define MEM_INIT_SECTIONS ".meminit.*"
960 #define EXIT_SECTIONS ".exit.*"
961 #define MEM_EXIT_SECTIONS ".memexit.*"
963 #define ALL_TEXT_SECTIONS ALL_INIT_TEXT_SECTIONS, ALL_EXIT_TEXT_SECTIONS, \
964 TEXT_SECTIONS, OTHER_TEXT_SECTIONS
966 /* init data sections */
967 static const char *const init_data_sections[] =
968 { ALL_INIT_DATA_SECTIONS, NULL };
970 /* all init sections */
971 static const char *const init_sections[] = { ALL_INIT_SECTIONS, NULL };
973 /* All init and exit sections (code + data) */
974 static const char *const init_exit_sections[] =
975 {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };
977 /* all text sections */
978 static const char *const text_sections[] = { ALL_TEXT_SECTIONS, NULL };
981 static const char *const data_sections[] = { DATA_SECTIONS, NULL };
984 /* symbols in .data that may refer to init/exit sections */
985 #define DEFAULT_SYMBOL_WHITE_LIST \
987 "*_template", /* scsi uses *_template a lot */ \
988 "*_timer", /* arm uses ops structures named _timer a lot */ \
989 "*_sht", /* scsi also used *_sht to some extent */ \
995 static const char *const head_sections[] = { ".head.text*", NULL };
996 static const char *const linker_symbols[] =
997 { "__init_begin", "_sinittext", "_einittext", NULL };
998 static const char *const optim_symbols[] = { "*.constprop.*", NULL };
1005 XXXINIT_TO_SOME_INIT,
1006 XXXEXIT_TO_SOME_EXIT,
1007 ANY_INIT_TO_ANY_EXIT,
1008 ANY_EXIT_TO_ANY_INIT,
1009 EXPORT_TO_INIT_EXIT,
1010 EXTABLE_TO_NON_TEXT,
1014 * Describe how to match sections on different criterias:
1016 * @fromsec: Array of sections to be matched.
1018 * @bad_tosec: Relocations applied to a section in @fromsec to a section in
1019 * this array is forbidden (black-list). Can be empty.
1021 * @good_tosec: Relocations applied to a section in @fromsec must be
1022 * targetting sections in this array (white-list). Can be empty.
1024 * @mismatch: Type of mismatch.
1026 * @symbol_white_list: Do not match a relocation to a symbol in this list
1027 * even if it is targetting a section in @bad_to_sec.
1029 * @handler: Specific handler to call when a match is found. If NULL,
1030 * default_mismatch_handler() will be called.
1033 struct sectioncheck {
1034 const char *fromsec[20];
1035 const char *bad_tosec[20];
1036 const char *good_tosec[20];
1037 enum mismatch mismatch;
1038 const char *symbol_white_list[20];
1039 void (*handler)(const char *modname, struct elf_info *elf,
1040 const struct sectioncheck* const mismatch,
1041 Elf_Rela *r, Elf_Sym *sym, const char *fromsec);
1045 static void extable_mismatch_handler(const char *modname, struct elf_info *elf,
1046 const struct sectioncheck* const mismatch,
1047 Elf_Rela *r, Elf_Sym *sym,
1048 const char *fromsec);
1050 static const struct sectioncheck sectioncheck[] = {
1051 /* Do not reference init/exit code/data from
1052 * normal code and data
1055 .fromsec = { TEXT_SECTIONS, NULL },
1056 .bad_tosec = { ALL_INIT_SECTIONS, NULL },
1057 .mismatch = TEXT_TO_ANY_INIT,
1058 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1061 .fromsec = { DATA_SECTIONS, NULL },
1062 .bad_tosec = { ALL_XXXINIT_SECTIONS, NULL },
1063 .mismatch = DATA_TO_ANY_INIT,
1064 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1067 .fromsec = { DATA_SECTIONS, NULL },
1068 .bad_tosec = { INIT_SECTIONS, NULL },
1069 .mismatch = DATA_TO_ANY_INIT,
1070 .symbol_white_list = {
1071 "*_template", "*_timer", "*_sht", "*_ops",
1072 "*_probe", "*_probe_one", "*_console", NULL
1076 .fromsec = { TEXT_SECTIONS, NULL },
1077 .bad_tosec = { ALL_EXIT_SECTIONS, NULL },
1078 .mismatch = TEXT_TO_ANY_EXIT,
1079 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1082 .fromsec = { DATA_SECTIONS, NULL },
1083 .bad_tosec = { ALL_EXIT_SECTIONS, NULL },
1084 .mismatch = DATA_TO_ANY_EXIT,
1085 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1087 /* Do not reference init code/data from meminit code/data */
1089 .fromsec = { ALL_XXXINIT_SECTIONS, NULL },
1090 .bad_tosec = { INIT_SECTIONS, NULL },
1091 .mismatch = XXXINIT_TO_SOME_INIT,
1092 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1094 /* Do not reference exit code/data from memexit code/data */
1096 .fromsec = { ALL_XXXEXIT_SECTIONS, NULL },
1097 .bad_tosec = { EXIT_SECTIONS, NULL },
1098 .mismatch = XXXEXIT_TO_SOME_EXIT,
1099 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1101 /* Do not use exit code/data from init code */
1103 .fromsec = { ALL_INIT_SECTIONS, NULL },
1104 .bad_tosec = { ALL_EXIT_SECTIONS, NULL },
1105 .mismatch = ANY_INIT_TO_ANY_EXIT,
1106 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1108 /* Do not use init code/data from exit code */
1110 .fromsec = { ALL_EXIT_SECTIONS, NULL },
1111 .bad_tosec = { ALL_INIT_SECTIONS, NULL },
1112 .mismatch = ANY_EXIT_TO_ANY_INIT,
1113 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1116 .fromsec = { ALL_PCI_INIT_SECTIONS, NULL },
1117 .bad_tosec = { INIT_SECTIONS, NULL },
1118 .mismatch = ANY_INIT_TO_ANY_EXIT,
1119 .symbol_white_list = { NULL },
1121 /* Do not export init/exit functions or data */
1123 .fromsec = { "__ksymtab*", NULL },
1124 .bad_tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
1125 .mismatch = EXPORT_TO_INIT_EXIT,
1126 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1129 .fromsec = { "__ex_table", NULL },
1130 /* If you're adding any new black-listed sections in here, consider
1131 * adding a special 'printer' for them in scripts/check_extable.
1133 .bad_tosec = { ".altinstr_replacement", NULL },
1134 .good_tosec = {ALL_TEXT_SECTIONS , NULL},
1135 .mismatch = EXTABLE_TO_NON_TEXT,
1136 .handler = extable_mismatch_handler,
1140 static const struct sectioncheck *section_mismatch(
1141 const char *fromsec, const char *tosec)
1144 int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
1145 const struct sectioncheck *check = §ioncheck[0];
1148 * The target section could be the SHT_NUL section when we're
1149 * handling relocations to un-resolved symbols, trying to match it
1150 * doesn't make much sense and causes build failures on parisc
1156 for (i = 0; i < elems; i++) {
1157 if (match(fromsec, check->fromsec)) {
1158 if (check->bad_tosec[0] && match(tosec, check->bad_tosec))
1160 if (check->good_tosec[0] && !match(tosec, check->good_tosec))
1169 * Whitelist to allow certain references to pass with no warning.
1172 * If a module parameter is declared __initdata and permissions=0
1173 * then this is legal despite the warning generated.
1174 * We cannot see value of permissions here, so just ignore
1176 * The pattern is identified by:
1177 * tosec = .init.data
1182 * module_param_call() ops can refer to __init set function if permissions=0
1183 * The pattern is identified by:
1184 * tosec = .init.text
1186 * atsym = __param_ops_*
1189 * Many drivers utilise a *driver container with references to
1190 * add, remove, probe functions etc.
1191 * the pattern is identified by:
1192 * tosec = init or exit section
1193 * fromsec = data section
1194 * atsym = *driver, *_template, *_sht, *_ops, *_probe,
1195 * *probe_one, *_console, *_timer
1198 * Whitelist all references from .head.text to any init section
1201 * Some symbols belong to init section but still it is ok to reference
1202 * these from non-init sections as these symbols don't have any memory
1203 * allocated for them and symbol address and value are same. So even
1204 * if init section is freed, its ok to reference those symbols.
1205 * For ex. symbols marking the init section boundaries.
1206 * This pattern is identified by
1207 * refsymname = __init_begin, _sinittext, _einittext
1210 * GCC may optimize static inlines when fed constant arg(s) resulting
1211 * in functions like cpumask_empty() -- generating an associated symbol
1212 * cpumask_empty.constprop.3 that appears in the audit. If the const that
1213 * is passed in comes from __init, like say nmi_ipi_mask, we get a
1214 * meaningless section warning. May need to add isra symbols too...
1215 * This pattern is identified by
1216 * tosec = init section
1217 * fromsec = text section
1218 * refsymname = *.constprop.*
1221 * Hide section mismatch warnings for ELF local symbols. The goal
1222 * is to eliminate false positive modpost warnings caused by
1223 * compiler-generated ELF local symbol names such as ".LANCHOR1".
1224 * Autogenerated symbol names bypass modpost's "Pattern 2"
1225 * whitelisting, which relies on pattern-matching against symbol
1226 * names to work. (One situation where gcc can autogenerate ELF
1227 * local symbols is when "-fsection-anchors" is used.)
1229 static int secref_whitelist(const struct sectioncheck *mismatch,
1230 const char *fromsec, const char *fromsym,
1231 const char *tosec, const char *tosym)
1233 /* Check for pattern 1 */
1234 if (match(tosec, init_data_sections) &&
1235 match(fromsec, data_sections) &&
1236 strstarts(fromsym, "__param"))
1239 /* Check for pattern 1a */
1240 if (strcmp(tosec, ".init.text") == 0 &&
1241 match(fromsec, data_sections) &&
1242 strstarts(fromsym, "__param_ops_"))
1245 /* Check for pattern 2 */
1246 if (match(tosec, init_exit_sections) &&
1247 match(fromsec, data_sections) &&
1248 match(fromsym, mismatch->symbol_white_list))
1251 /* Check for pattern 3 */
1252 if (match(fromsec, head_sections) &&
1253 match(tosec, init_sections))
1256 /* Check for pattern 4 */
1257 if (match(tosym, linker_symbols))
1260 /* Check for pattern 5 */
1261 if (match(fromsec, text_sections) &&
1262 match(tosec, init_sections) &&
1263 match(fromsym, optim_symbols))
1266 /* Check for pattern 6 */
1267 if (strstarts(fromsym, ".L"))
1273 static inline int is_arm_mapping_symbol(const char *str)
1275 return str[0] == '$' && strchr("axtd", str[1])
1276 && (str[2] == '\0' || str[2] == '.');
1280 * If there's no name there, ignore it; likewise, ignore it if it's
1281 * one of the magic symbols emitted used by current ARM tools.
1283 * Otherwise if find_symbols_between() returns those symbols, they'll
1284 * fail the whitelist tests and cause lots of false alarms ... fixable
1285 * only by merging __exit and __init sections into __text, bloating
1286 * the kernel (which is especially evil on embedded platforms).
1288 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
1290 const char *name = elf->strtab + sym->st_name;
1292 if (!name || !strlen(name))
1294 return !is_arm_mapping_symbol(name);
1298 * Find symbol based on relocation record info.
1299 * In some cases the symbol supplied is a valid symbol so
1300 * return refsym. If st_name != 0 we assume this is a valid symbol.
1301 * In other cases the symbol needs to be looked up in the symbol table
1302 * based on section and address.
1304 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
1308 Elf_Sym *near = NULL;
1309 Elf64_Sword distance = 20;
1311 unsigned int relsym_secindex;
1313 if (relsym->st_name != 0)
1316 relsym_secindex = get_secindex(elf, relsym);
1317 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1318 if (get_secindex(elf, sym) != relsym_secindex)
1320 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
1322 if (!is_valid_name(elf, sym))
1324 if (sym->st_value == addr)
1326 /* Find a symbol nearby - addr are maybe negative */
1327 d = sym->st_value - addr;
1329 d = addr - sym->st_value;
1335 /* We need a close match */
1343 * Find symbols before or equal addr and after addr - in the section sec.
1344 * If we find two symbols with equal offset prefer one with a valid name.
1345 * The ELF format may have a better way to detect what type of symbol
1346 * it is, but this works for now.
1348 static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
1352 Elf_Sym *near = NULL;
1353 Elf_Addr distance = ~0;
1355 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1358 if (is_shndx_special(sym->st_shndx))
1360 symsec = sec_name(elf, get_secindex(elf, sym));
1361 if (strcmp(symsec, sec) != 0)
1363 if (!is_valid_name(elf, sym))
1365 if (sym->st_value <= addr) {
1366 if ((addr - sym->st_value) < distance) {
1367 distance = addr - sym->st_value;
1369 } else if ((addr - sym->st_value) == distance) {
1378 * Convert a section name to the function/data attribute
1379 * .init.text => __init
1380 * .memexitconst => __memconst
1383 * The memory of returned value has been allocated on a heap. The user of this
1384 * method should free it after usage.
1386 static char *sec2annotation(const char *s)
1388 if (match(s, init_exit_sections)) {
1389 char *p = NOFAIL(malloc(20));
1396 while (*s && *s != '.')
1401 if (strstr(s, "rodata") != NULL)
1402 strcat(p, "const ");
1403 else if (strstr(s, "data") != NULL)
1409 return NOFAIL(strdup(""));
1413 static int is_function(Elf_Sym *sym)
1416 return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
1421 static void print_section_list(const char * const list[20])
1423 const char *const *s = list;
1426 fprintf(stderr, "%s", *s);
1429 fprintf(stderr, ", ");
1431 fprintf(stderr, "\n");
1434 static inline void get_pretty_name(int is_func, const char** name, const char** name_p)
1437 case 0: *name = "variable"; *name_p = ""; break;
1438 case 1: *name = "function"; *name_p = "()"; break;
1439 default: *name = "(unknown reference)"; *name_p = ""; break;
1444 * Print a warning about a section mismatch.
1445 * Try to find symbols near it so user can find it.
1446 * Check whitelist before warning - it may be a false positive.
1448 static void report_sec_mismatch(const char *modname,
1449 const struct sectioncheck *mismatch,
1450 const char *fromsec,
1451 unsigned long long fromaddr,
1452 const char *fromsym,
1454 const char *tosec, const char *tosym,
1457 const char *from, *from_p;
1458 const char *to, *to_p;
1462 sec_mismatch_count++;
1464 get_pretty_name(from_is_func, &from, &from_p);
1465 get_pretty_name(to_is_func, &to, &to_p);
1467 warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s "
1468 "to the %s %s:%s%s\n",
1469 modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec,
1472 switch (mismatch->mismatch) {
1473 case TEXT_TO_ANY_INIT:
1474 prl_from = sec2annotation(fromsec);
1475 prl_to = sec2annotation(tosec);
1477 "The function %s%s() references\n"
1479 "This is often because %s lacks a %s\n"
1480 "annotation or the annotation of %s is wrong.\n",
1482 to, prl_to, tosym, to_p,
1483 fromsym, prl_to, tosym);
1487 case DATA_TO_ANY_INIT: {
1488 prl_to = sec2annotation(tosec);
1490 "The variable %s references\n"
1492 "If the reference is valid then annotate the\n"
1493 "variable with __init* or __refdata (see linux/init.h) "
1494 "or name the variable:\n",
1495 fromsym, to, prl_to, tosym, to_p);
1496 print_section_list(mismatch->symbol_white_list);
1500 case TEXT_TO_ANY_EXIT:
1501 prl_to = sec2annotation(tosec);
1503 "The function %s() references a %s in an exit section.\n"
1504 "Often the %s %s%s has valid usage outside the exit section\n"
1505 "and the fix is to remove the %sannotation of %s.\n",
1506 fromsym, to, to, tosym, to_p, prl_to, tosym);
1509 case DATA_TO_ANY_EXIT: {
1510 prl_to = sec2annotation(tosec);
1512 "The variable %s references\n"
1514 "If the reference is valid then annotate the\n"
1515 "variable with __exit* (see linux/init.h) or "
1516 "name the variable:\n",
1517 fromsym, to, prl_to, tosym, to_p);
1518 print_section_list(mismatch->symbol_white_list);
1522 case XXXINIT_TO_SOME_INIT:
1523 case XXXEXIT_TO_SOME_EXIT:
1524 prl_from = sec2annotation(fromsec);
1525 prl_to = sec2annotation(tosec);
1527 "The %s %s%s%s references\n"
1529 "If %s is only used by %s then\n"
1530 "annotate %s with a matching annotation.\n",
1531 from, prl_from, fromsym, from_p,
1532 to, prl_to, tosym, to_p,
1533 tosym, fromsym, tosym);
1537 case ANY_INIT_TO_ANY_EXIT:
1538 prl_from = sec2annotation(fromsec);
1539 prl_to = sec2annotation(tosec);
1541 "The %s %s%s%s references\n"
1543 "This is often seen when error handling "
1544 "in the init function\n"
1545 "uses functionality in the exit path.\n"
1546 "The fix is often to remove the %sannotation of\n"
1547 "%s%s so it may be used outside an exit section.\n",
1548 from, prl_from, fromsym, from_p,
1549 to, prl_to, tosym, to_p,
1550 prl_to, tosym, to_p);
1554 case ANY_EXIT_TO_ANY_INIT:
1555 prl_from = sec2annotation(fromsec);
1556 prl_to = sec2annotation(tosec);
1558 "The %s %s%s%s references\n"
1560 "This is often seen when error handling "
1561 "in the exit function\n"
1562 "uses functionality in the init path.\n"
1563 "The fix is often to remove the %sannotation of\n"
1564 "%s%s so it may be used outside an init section.\n",
1565 from, prl_from, fromsym, from_p,
1566 to, prl_to, tosym, to_p,
1567 prl_to, tosym, to_p);
1571 case EXPORT_TO_INIT_EXIT:
1572 prl_to = sec2annotation(tosec);
1574 "The symbol %s is exported and annotated %s\n"
1575 "Fix this by removing the %sannotation of %s "
1576 "or drop the export.\n",
1577 tosym, prl_to, prl_to, tosym);
1580 case EXTABLE_TO_NON_TEXT:
1581 fatal("There's a special handler for this mismatch type, "
1582 "we should never get here.");
1585 fprintf(stderr, "\n");
1588 static void default_mismatch_handler(const char *modname, struct elf_info *elf,
1589 const struct sectioncheck* const mismatch,
1590 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1596 const char *fromsym;
1598 from = find_elf_symbol2(elf, r->r_offset, fromsec);
1599 fromsym = sym_name(elf, from);
1601 if (strstarts(fromsym, "reference___initcall"))
1604 tosec = sec_name(elf, get_secindex(elf, sym));
1605 to = find_elf_symbol(elf, r->r_addend, sym);
1606 tosym = sym_name(elf, to);
1608 /* check whitelist - we may ignore it */
1609 if (secref_whitelist(mismatch,
1610 fromsec, fromsym, tosec, tosym)) {
1611 report_sec_mismatch(modname, mismatch,
1612 fromsec, r->r_offset, fromsym,
1613 is_function(from), tosec, tosym,
1618 static int is_executable_section(struct elf_info* elf, unsigned int section_index)
1620 if (section_index > elf->num_sections)
1621 fatal("section_index is outside elf->num_sections!\n");
1623 return ((elf->sechdrs[section_index].sh_flags & SHF_EXECINSTR) == SHF_EXECINSTR);
1627 * We rely on a gross hack in section_rel[a]() calling find_extable_entry_size()
1628 * to know the sizeof(struct exception_table_entry) for the target architecture.
1630 static unsigned int extable_entry_size = 0;
1631 static void find_extable_entry_size(const char* const sec, const Elf_Rela* r)
1634 * If we're currently checking the second relocation within __ex_table,
1635 * that relocation offset tells us the offsetof(struct
1636 * exception_table_entry, fixup) which is equal to sizeof(struct
1637 * exception_table_entry) divided by two. We use that to our advantage
1638 * since there's no portable way to get that size as every architecture
1639 * seems to go with different sized types. Not pretty but better than
1640 * hard-coding the size for every architecture..
1642 if (!extable_entry_size)
1643 extable_entry_size = r->r_offset * 2;
1646 static inline bool is_extable_fault_address(Elf_Rela *r)
1649 * extable_entry_size is only discovered after we've handled the
1650 * _second_ relocation in __ex_table, so only abort when we're not
1651 * handling the first reloc and extable_entry_size is zero.
1653 if (r->r_offset && extable_entry_size == 0)
1654 fatal("extable_entry size hasn't been discovered!\n");
1656 return ((r->r_offset == 0) ||
1657 (r->r_offset % extable_entry_size == 0));
1660 #define is_second_extable_reloc(Start, Cur, Sec) \
1661 (((Cur) == (Start) + 1) && (strcmp("__ex_table", (Sec)) == 0))
1663 static void report_extable_warnings(const char* modname, struct elf_info* elf,
1664 const struct sectioncheck* const mismatch,
1665 Elf_Rela* r, Elf_Sym* sym,
1666 const char* fromsec, const char* tosec)
1668 Elf_Sym* fromsym = find_elf_symbol2(elf, r->r_offset, fromsec);
1669 const char* fromsym_name = sym_name(elf, fromsym);
1670 Elf_Sym* tosym = find_elf_symbol(elf, r->r_addend, sym);
1671 const char* tosym_name = sym_name(elf, tosym);
1672 const char* from_pretty_name;
1673 const char* from_pretty_name_p;
1674 const char* to_pretty_name;
1675 const char* to_pretty_name_p;
1677 get_pretty_name(is_function(fromsym),
1678 &from_pretty_name, &from_pretty_name_p);
1679 get_pretty_name(is_function(tosym),
1680 &to_pretty_name, &to_pretty_name_p);
1682 warn("%s(%s+0x%lx): Section mismatch in reference"
1683 " from the %s %s%s to the %s %s:%s%s\n",
1684 modname, fromsec, (long)r->r_offset, from_pretty_name,
1685 fromsym_name, from_pretty_name_p,
1686 to_pretty_name, tosec, tosym_name, to_pretty_name_p);
1688 if (!match(tosec, mismatch->bad_tosec) &&
1689 is_executable_section(elf, get_secindex(elf, sym)))
1691 "The relocation at %s+0x%lx references\n"
1692 "section \"%s\" which is not in the list of\n"
1693 "authorized sections. If you're adding a new section\n"
1694 "and/or if this reference is valid, add \"%s\" to the\n"
1695 "list of authorized sections to jump to on fault.\n"
1696 "This can be achieved by adding \"%s\" to \n"
1697 "OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.\n",
1698 fromsec, (long)r->r_offset, tosec, tosec, tosec);
1701 static void extable_mismatch_handler(const char* modname, struct elf_info *elf,
1702 const struct sectioncheck* const mismatch,
1703 Elf_Rela* r, Elf_Sym* sym,
1704 const char *fromsec)
1706 const char* tosec = sec_name(elf, get_secindex(elf, sym));
1708 sec_mismatch_count++;
1710 report_extable_warnings(modname, elf, mismatch, r, sym, fromsec, tosec);
1712 if (match(tosec, mismatch->bad_tosec))
1713 fatal("The relocation at %s+0x%lx references\n"
1714 "section \"%s\" which is black-listed.\n"
1715 "Something is seriously wrong and should be fixed.\n"
1716 "You might get more information about where this is\n"
1717 "coming from by using scripts/check_extable.sh %s\n",
1718 fromsec, (long)r->r_offset, tosec, modname);
1719 else if (!is_executable_section(elf, get_secindex(elf, sym))) {
1720 if (is_extable_fault_address(r))
1721 fatal("The relocation at %s+0x%lx references\n"
1722 "section \"%s\" which is not executable, IOW\n"
1723 "it is not possible for the kernel to fault\n"
1724 "at that address. Something is seriously wrong\n"
1725 "and should be fixed.\n",
1726 fromsec, (long)r->r_offset, tosec);
1728 fatal("The relocation at %s+0x%lx references\n"
1729 "section \"%s\" which is not executable, IOW\n"
1730 "the kernel will fault if it ever tries to\n"
1731 "jump to it. Something is seriously wrong\n"
1732 "and should be fixed.\n",
1733 fromsec, (long)r->r_offset, tosec);
1737 static void check_section_mismatch(const char *modname, struct elf_info *elf,
1738 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1740 const char *tosec = sec_name(elf, get_secindex(elf, sym));
1741 const struct sectioncheck *mismatch = section_mismatch(fromsec, tosec);
1744 if (mismatch->handler)
1745 mismatch->handler(modname, elf, mismatch,
1748 default_mismatch_handler(modname, elf, mismatch,
1753 static unsigned int *reloc_location(struct elf_info *elf,
1754 Elf_Shdr *sechdr, Elf_Rela *r)
1756 Elf_Shdr *sechdrs = elf->sechdrs;
1757 int section = sechdr->sh_info;
1759 return (void *)elf->hdr + sechdrs[section].sh_offset +
1763 static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1765 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1766 unsigned int *location = reloc_location(elf, sechdr, r);
1770 r->r_addend = TO_NATIVE(*location);
1773 r->r_addend = TO_NATIVE(*location) + 4;
1774 /* For CONFIG_RELOCATABLE=y */
1775 if (elf->hdr->e_type == ET_EXEC)
1776 r->r_addend += r->r_offset;
1783 #define R_ARM_CALL 28
1785 #ifndef R_ARM_JUMP24
1786 #define R_ARM_JUMP24 29
1789 #ifndef R_ARM_THM_CALL
1790 #define R_ARM_THM_CALL 10
1792 #ifndef R_ARM_THM_JUMP24
1793 #define R_ARM_THM_JUMP24 30
1795 #ifndef R_ARM_THM_JUMP19
1796 #define R_ARM_THM_JUMP19 51
1799 static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1801 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1805 /* From ARM ABI: (S + A) | T */
1806 r->r_addend = (int)(long)
1807 (elf->symtab_start + ELF_R_SYM(r->r_info));
1812 case R_ARM_THM_CALL:
1813 case R_ARM_THM_JUMP24:
1814 case R_ARM_THM_JUMP19:
1815 /* From ARM ABI: ((S + A) | T) - P */
1816 r->r_addend = (int)(long)(elf->hdr +
1818 (r->r_offset - sechdr->sh_addr));
1826 static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1828 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1829 unsigned int *location = reloc_location(elf, sechdr, r);
1832 if (r_typ == R_MIPS_HI16)
1833 return 1; /* skip this */
1834 inst = TO_NATIVE(*location);
1837 r->r_addend = inst & 0xffff;
1840 r->r_addend = (inst & 0x03ffffff) << 2;
1849 static void section_rela(const char *modname, struct elf_info *elf,
1856 const char *fromsec;
1858 Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
1859 Elf_Rela *stop = (void *)start + sechdr->sh_size;
1861 fromsec = sech_name(elf, sechdr);
1862 fromsec += strlen(".rela");
1863 /* if from section (name) is know good then skip it */
1864 if (match(fromsec, section_white_list))
1867 for (rela = start; rela < stop; rela++) {
1868 r.r_offset = TO_NATIVE(rela->r_offset);
1869 #if KERNEL_ELFCLASS == ELFCLASS64
1870 if (elf->hdr->e_machine == EM_MIPS) {
1872 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
1873 r_sym = TO_NATIVE(r_sym);
1874 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1875 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1877 r.r_info = TO_NATIVE(rela->r_info);
1878 r_sym = ELF_R_SYM(r.r_info);
1881 r.r_info = TO_NATIVE(rela->r_info);
1882 r_sym = ELF_R_SYM(r.r_info);
1884 r.r_addend = TO_NATIVE(rela->r_addend);
1885 sym = elf->symtab_start + r_sym;
1886 /* Skip special sections */
1887 if (is_shndx_special(sym->st_shndx))
1889 if (is_second_extable_reloc(start, rela, fromsec))
1890 find_extable_entry_size(fromsec, &r);
1891 check_section_mismatch(modname, elf, &r, sym, fromsec);
1895 static void section_rel(const char *modname, struct elf_info *elf,
1902 const char *fromsec;
1904 Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
1905 Elf_Rel *stop = (void *)start + sechdr->sh_size;
1907 fromsec = sech_name(elf, sechdr);
1908 fromsec += strlen(".rel");
1909 /* if from section (name) is know good then skip it */
1910 if (match(fromsec, section_white_list))
1913 for (rel = start; rel < stop; rel++) {
1914 r.r_offset = TO_NATIVE(rel->r_offset);
1915 #if KERNEL_ELFCLASS == ELFCLASS64
1916 if (elf->hdr->e_machine == EM_MIPS) {
1918 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1919 r_sym = TO_NATIVE(r_sym);
1920 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1921 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1923 r.r_info = TO_NATIVE(rel->r_info);
1924 r_sym = ELF_R_SYM(r.r_info);
1927 r.r_info = TO_NATIVE(rel->r_info);
1928 r_sym = ELF_R_SYM(r.r_info);
1931 switch (elf->hdr->e_machine) {
1933 if (addend_386_rel(elf, sechdr, &r))
1937 if (addend_arm_rel(elf, sechdr, &r))
1941 if (addend_mips_rel(elf, sechdr, &r))
1945 sym = elf->symtab_start + r_sym;
1946 /* Skip special sections */
1947 if (is_shndx_special(sym->st_shndx))
1949 if (is_second_extable_reloc(start, rel, fromsec))
1950 find_extable_entry_size(fromsec, &r);
1951 check_section_mismatch(modname, elf, &r, sym, fromsec);
1956 * A module includes a number of sections that are discarded
1957 * either when loaded or when used as built-in.
1958 * For loaded modules all functions marked __init and all data
1959 * marked __initdata will be discarded when the module has been initialized.
1960 * Likewise for modules used built-in the sections marked __exit
1961 * are discarded because __exit marked function are supposed to be called
1962 * only when a module is unloaded which never happens for built-in modules.
1963 * The check_sec_ref() function traverses all relocation records
1964 * to find all references to a section that reference a section that will
1965 * be discarded and warns about it.
1967 static void check_sec_ref(struct module *mod, const char *modname,
1968 struct elf_info *elf)
1971 Elf_Shdr *sechdrs = elf->sechdrs;
1973 /* Walk through all sections */
1974 for (i = 0; i < elf->num_sections; i++) {
1975 check_section(modname, elf, &elf->sechdrs[i]);
1976 /* We want to process only relocation sections and not .init */
1977 if (sechdrs[i].sh_type == SHT_RELA)
1978 section_rela(modname, elf, &elf->sechdrs[i]);
1979 else if (sechdrs[i].sh_type == SHT_REL)
1980 section_rel(modname, elf, &elf->sechdrs[i]);
1984 static char *remove_dot(char *s)
1986 size_t n = strcspn(s, ".");
1989 size_t m = strspn(s + n + 1, "0123456789");
1990 if (m && (s[n + m] == '.' || s[n + m] == 0))
1996 static void read_symbols(const char *modname)
1998 const char *symname;
2003 struct elf_info info = { };
2006 if (!parse_elf(&info, modname))
2009 mod = new_module(modname);
2011 /* When there's no vmlinux, don't print warnings about
2012 * unresolved symbols (since there'll be too many ;) */
2013 if (is_vmlinux(modname)) {
2018 license = get_modinfo(&info, "license");
2019 if (!license && !is_vmlinux(modname))
2020 warn("modpost: missing MODULE_LICENSE() in %s\n"
2021 "see include/linux/module.h for "
2022 "more information\n", modname);
2024 if (license_is_gpl_compatible(license))
2025 mod->gpl_compatible = 1;
2027 mod->gpl_compatible = 0;
2030 license = get_next_modinfo(&info, "license", license);
2033 namespace = get_modinfo(&info, "import_ns");
2035 add_namespace(&mod->imported_namespaces, namespace);
2036 namespace = get_next_modinfo(&info, "import_ns", namespace);
2039 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
2040 symname = remove_dot(info.strtab + sym->st_name);
2042 handle_modversions(mod, &info, sym, symname);
2043 handle_moddevtable(mod, &info, sym, symname);
2046 // check for static EXPORT_SYMBOL_* functions && global vars
2047 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
2048 unsigned char bind = ELF_ST_BIND(sym->st_info);
2050 if (bind == STB_GLOBAL || bind == STB_WEAK) {
2052 find_symbol(remove_dot(info.strtab +
2060 if (!is_vmlinux(modname) || vmlinux_section_warnings)
2061 check_sec_ref(mod, modname, &info);
2063 version = get_modinfo(&info, "version");
2065 maybe_frob_rcs_version(modname, version, info.modinfo,
2066 version - (char *)info.hdr);
2067 if (version || (all_versions && !is_vmlinux(modname)))
2068 get_src_version(modname, mod->srcversion,
2069 sizeof(mod->srcversion)-1);
2071 parse_elf_finish(&info);
2073 /* Our trick to get versioning for module struct etc. - it's
2074 * never passed as an argument to an exported function, so
2075 * the automatic versioning doesn't pick it up, but it's really
2076 * important anyhow */
2078 mod->unres = alloc_symbol("module_layout", 0, mod->unres);
2081 static void read_symbols_from_files(const char *filename)
2084 char fname[PATH_MAX];
2086 if (strcmp(filename, "-") != 0) {
2087 in = fopen(filename, "r");
2089 fatal("Can't open filenames file %s: %m", filename);
2092 while (fgets(fname, PATH_MAX, in) != NULL) {
2093 if (strends(fname, "\n"))
2094 fname[strlen(fname)-1] = '\0';
2095 read_symbols(fname);
2104 /* We first write the generated file into memory using the
2105 * following helper, then compare to the file on disk and
2106 * only update the later if anything changed */
2108 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
2109 const char *fmt, ...)
2116 len = vsnprintf(tmp, SZ, fmt, ap);
2117 buf_write(buf, tmp, len);
2121 void buf_write(struct buffer *buf, const char *s, int len)
2123 if (buf->size - buf->pos < len) {
2124 buf->size += len + SZ;
2125 buf->p = NOFAIL(realloc(buf->p, buf->size));
2127 strncpy(buf->p + buf->pos, s, len);
2131 static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
2133 const char *e = is_vmlinux(m) ?"":".ko";
2137 fatal("modpost: GPL-incompatible module %s%s "
2138 "uses GPL-only symbol '%s'\n", m, e, s);
2140 case export_unused_gpl:
2141 fatal("modpost: GPL-incompatible module %s%s "
2142 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
2144 case export_gpl_future:
2145 warn("modpost: GPL-incompatible module %s%s "
2146 "uses future GPL-only symbol '%s'\n", m, e, s);
2150 case export_unknown:
2156 static void check_for_unused(enum export exp, const char *m, const char *s)
2158 const char *e = is_vmlinux(m) ?"":".ko";
2162 case export_unused_gpl:
2163 warn("modpost: module %s%s "
2164 "uses symbol '%s' marked UNUSED\n", m, e, s);
2172 static int check_exports(struct module *mod)
2174 struct symbol *s, *exp;
2177 for (s = mod->unres; s; s = s->next) {
2178 const char *basename;
2179 exp = find_symbol(s->name);
2180 if (!exp || exp->module == mod) {
2181 if (have_vmlinux && !s->weak) {
2182 if (warn_unresolved) {
2183 warn("\"%s\" [%s.ko] undefined!\n",
2184 s->name, mod->name);
2186 merror("\"%s\" [%s.ko] undefined!\n",
2187 s->name, mod->name);
2193 basename = strrchr(mod->name, '/');
2197 basename = mod->name;
2199 if (exp->namespace && exp->namespace[0]) {
2200 add_namespace(&mod->required_namespaces,
2203 if (!write_namespace_deps &&
2204 !module_imports_namespace(mod, exp->namespace)) {
2205 warn("module %s uses symbol %s from namespace %s, but does not import it.\n",
2206 basename, exp->name, exp->namespace);
2210 if (!mod->gpl_compatible)
2211 check_for_gpl_usage(exp->export, basename, exp->name);
2212 check_for_unused(exp->export, basename, exp->name);
2218 static int check_modname_len(struct module *mod)
2220 const char *mod_name;
2222 mod_name = strrchr(mod->name, '/');
2223 if (mod_name == NULL)
2224 mod_name = mod->name;
2227 if (strlen(mod_name) >= MODULE_NAME_LEN) {
2228 merror("module name is too long [%s.ko]\n", mod->name);
2236 * Header for the generated file
2238 static void add_header(struct buffer *b, struct module *mod)
2240 buf_printf(b, "#include <linux/build-salt.h>\n");
2241 buf_printf(b, "#include <linux/module.h>\n");
2242 buf_printf(b, "#include <linux/vermagic.h>\n");
2243 buf_printf(b, "#include <linux/compiler.h>\n");
2244 buf_printf(b, "\n");
2245 buf_printf(b, "BUILD_SALT;\n");
2246 buf_printf(b, "\n");
2247 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
2248 buf_printf(b, "MODULE_INFO(name, KBUILD_MODNAME);\n");
2249 buf_printf(b, "\n");
2250 buf_printf(b, "__visible struct module __this_module\n");
2251 buf_printf(b, "__section(.gnu.linkonce.this_module) = {\n");
2252 buf_printf(b, "\t.name = KBUILD_MODNAME,\n");
2254 buf_printf(b, "\t.init = init_module,\n");
2255 if (mod->has_cleanup)
2256 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
2257 "\t.exit = cleanup_module,\n"
2259 buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n");
2260 buf_printf(b, "};\n");
2263 static void add_intree_flag(struct buffer *b, int is_intree)
2266 buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n");
2269 /* Cannot check for assembler */
2270 static void add_retpoline(struct buffer *b)
2272 buf_printf(b, "\n#ifdef CONFIG_RETPOLINE\n");
2273 buf_printf(b, "MODULE_INFO(retpoline, \"Y\");\n");
2274 buf_printf(b, "#endif\n");
2277 static void add_staging_flag(struct buffer *b, const char *name)
2279 if (strstarts(name, "drivers/staging"))
2280 buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
2284 * Record CRCs for unresolved symbols
2286 static int add_versions(struct buffer *b, struct module *mod)
2288 struct symbol *s, *exp;
2291 for (s = mod->unres; s; s = s->next) {
2292 exp = find_symbol(s->name);
2293 if (!exp || exp->module == mod)
2295 s->module = exp->module;
2296 s->crc_valid = exp->crc_valid;
2303 buf_printf(b, "\n");
2304 buf_printf(b, "static const struct modversion_info ____versions[]\n");
2305 buf_printf(b, "__used __section(__versions) = {\n");
2307 for (s = mod->unres; s; s = s->next) {
2310 if (!s->crc_valid) {
2311 warn("\"%s\" [%s.ko] has no CRC!\n",
2312 s->name, mod->name);
2315 if (strlen(s->name) >= MODULE_NAME_LEN) {
2316 merror("too long symbol \"%s\" [%s.ko]\n",
2317 s->name, mod->name);
2321 buf_printf(b, "\t{ %#8x, \"%s\" },\n",
2325 buf_printf(b, "};\n");
2330 static void add_depends(struct buffer *b, struct module *mod)
2335 /* Clear ->seen flag of modules that own symbols needed by this. */
2336 for (s = mod->unres; s; s = s->next)
2338 s->module->seen = is_vmlinux(s->module->name);
2340 buf_printf(b, "\n");
2341 buf_printf(b, "MODULE_INFO(depends, \"");
2342 for (s = mod->unres; s; s = s->next) {
2347 if (s->module->seen)
2350 s->module->seen = 1;
2351 p = strrchr(s->module->name, '/');
2355 p = s->module->name;
2356 buf_printf(b, "%s%s", first ? "" : ",", p);
2359 buf_printf(b, "\");\n");
2362 static void add_srcversion(struct buffer *b, struct module *mod)
2364 if (mod->srcversion[0]) {
2365 buf_printf(b, "\n");
2366 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
2371 static void write_if_changed(struct buffer *b, const char *fname)
2377 file = fopen(fname, "r");
2381 if (fstat(fileno(file), &st) < 0)
2384 if (st.st_size != b->pos)
2387 tmp = NOFAIL(malloc(b->pos));
2388 if (fread(tmp, 1, b->pos, file) != b->pos)
2391 if (memcmp(tmp, b->p, b->pos) != 0)
2403 file = fopen(fname, "w");
2408 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
2415 /* parse Module.symvers file. line format:
2416 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
2418 static void read_dump(const char *fname, unsigned int kernel)
2420 unsigned long size, pos = 0;
2421 void *file = grab_file(fname, &size);
2425 /* No symbol versions, silently ignore */
2428 while ((line = get_next_line(&pos, file, size))) {
2429 char *symname, *namespace, *modname, *d, *export, *end;
2434 if (!(symname = strchr(line, '\t')))
2437 if (!(namespace = strchr(symname, '\t')))
2439 *namespace++ = '\0';
2440 if (!(modname = strchr(namespace, '\t')))
2443 if ((export = strchr(modname, '\t')) != NULL)
2445 if (export && ((end = strchr(export, '\t')) != NULL))
2447 crc = strtoul(line, &d, 16);
2448 if (*symname == '\0' || *modname == '\0' || *d != '\0')
2450 mod = find_module(modname);
2452 if (is_vmlinux(modname))
2454 mod = new_module(modname);
2457 s = sym_add_exported(symname, namespace, mod,
2462 sym_update_crc(symname, mod, crc, export_no(export));
2464 release_file(file, size);
2467 release_file(file, size);
2468 fatal("parse error in symbol dump file\n");
2471 /* For normal builds always dump all symbols.
2472 * For external modules only dump symbols
2473 * that are not read from kernel Module.symvers.
2475 static int dump_sym(struct symbol *sym)
2477 if (!external_module)
2479 if (sym->vmlinux || sym->kernel)
2484 static void write_dump(const char *fname)
2486 struct buffer buf = { };
2487 struct symbol *symbol;
2488 const char *namespace;
2491 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
2492 symbol = symbolhash[n];
2494 if (dump_sym(symbol)) {
2495 namespace = symbol->namespace;
2496 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\t%s\n",
2497 symbol->crc, symbol->name,
2498 namespace ? namespace : "",
2499 symbol->module->name,
2500 export_str(symbol->export));
2502 symbol = symbol->next;
2505 write_if_changed(&buf, fname);
2509 static void write_namespace_deps_files(void)
2512 struct namespace_list *ns;
2513 struct buffer ns_deps_buf = {};
2515 for (mod = modules; mod; mod = mod->next) {
2516 char fname[PATH_MAX];
2521 ns_deps_buf.pos = 0;
2523 for (ns = mod->required_namespaces; ns; ns = ns->next)
2524 buf_printf(&ns_deps_buf, "%s\n", ns->namespace);
2526 if (ns_deps_buf.pos == 0)
2529 sprintf(fname, "%s.ns_deps", mod->name);
2530 write_if_changed(&ns_deps_buf, fname);
2534 struct ext_sym_list {
2535 struct ext_sym_list *next;
2539 int main(int argc, char **argv)
2542 struct buffer buf = { };
2543 char *kernel_read = NULL, *module_read = NULL;
2544 char *dump_write = NULL, *files_source = NULL;
2548 struct ext_sym_list *extsym_iter;
2549 struct ext_sym_list *extsym_start = NULL;
2551 while ((opt = getopt(argc, argv, "i:I:e:mnsT:o:awEd")) != -1) {
2554 kernel_read = optarg;
2557 module_read = optarg;
2558 external_module = 1;
2561 external_module = 1;
2563 NOFAIL(malloc(sizeof(*extsym_iter)));
2564 extsym_iter->next = extsym_start;
2565 extsym_iter->file = optarg;
2566 extsym_start = extsym_iter;
2572 ignore_missing_files = 1;
2575 dump_write = optarg;
2581 vmlinux_section_warnings = 0;
2584 files_source = optarg;
2587 warn_unresolved = 1;
2590 sec_mismatch_fatal = 1;
2593 write_namespace_deps = 1;
2601 read_dump(kernel_read, 1);
2603 read_dump(module_read, 0);
2604 while (extsym_start) {
2605 read_dump(extsym_start->file, 0);
2606 extsym_iter = extsym_start->next;
2608 extsym_start = extsym_iter;
2611 while (optind < argc)
2612 read_symbols(argv[optind++]);
2615 read_symbols_from_files(files_source);
2619 for (mod = modules; mod; mod = mod->next) {
2620 char fname[PATH_MAX];
2627 err |= check_modname_len(mod);
2628 err |= check_exports(mod);
2629 if (write_namespace_deps)
2632 add_header(&buf, mod);
2633 add_intree_flag(&buf, !external_module);
2634 add_retpoline(&buf);
2635 add_staging_flag(&buf, mod->name);
2636 err |= add_versions(&buf, mod);
2637 add_depends(&buf, mod);
2638 add_moddevtable(&buf, mod);
2639 add_srcversion(&buf, mod);
2641 sprintf(fname, "%s.mod.c", mod->name);
2642 write_if_changed(&buf, fname);
2645 if (write_namespace_deps) {
2646 write_namespace_deps_files();
2651 write_dump(dump_write);
2652 if (sec_mismatch_count && sec_mismatch_fatal)
2653 fatal("modpost: Section mismatches detected.\n"
2654 "Set CONFIG_SECTION_MISMATCH_WARN_ONLY=y to allow them.\n");
2655 for (n = 0; n < SYMBOL_HASH_SIZE; n++) {
2658 for (s = symbolhash[n]; s; s = s->next) {
2660 * Do not check "vmlinux". This avoids the same warnings
2661 * shown twice, and false-positives for ARCH=um.
2663 if (is_vmlinux(s->module->name) && !s->module->is_dot_o)
2667 warn("\"%s\" [%s] is a static %s\n",
2668 s->name, s->module->name,
2669 export_str(s->export));