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;
44 export_plain, export_unused, export_gpl,
45 export_unused_gpl, export_gpl_future, export_unknown
48 /* In kernel, this size is defined in linux/module.h;
49 * here we use Elf_Addr instead of long for covering cross-compile
52 #define MODULE_NAME_LEN (64 - sizeof(Elf_Addr))
54 #define PRINTF __attribute__ ((format (printf, 1, 2)))
56 PRINTF void fatal(const char *fmt, ...)
60 fprintf(stderr, "FATAL: ");
62 va_start(arglist, fmt);
63 vfprintf(stderr, fmt, arglist);
69 PRINTF void warn(const char *fmt, ...)
73 fprintf(stderr, "WARNING: ");
75 va_start(arglist, fmt);
76 vfprintf(stderr, fmt, arglist);
80 PRINTF void merror(const char *fmt, ...)
84 fprintf(stderr, "ERROR: ");
86 va_start(arglist, fmt);
87 vfprintf(stderr, fmt, arglist);
91 static inline bool strends(const char *str, const char *postfix)
93 if (strlen(str) < strlen(postfix))
96 return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
99 static int is_vmlinux(const char *modname)
103 myname = strrchr(modname, '/');
109 return (strcmp(myname, "vmlinux") == 0) ||
110 (strcmp(myname, "vmlinux.o") == 0);
113 void *do_nofail(void *ptr, const char *expr)
116 fatal("modpost: Memory allocation failure: %s.\n", expr);
121 /* A list of all modules we processed */
122 static struct module *modules;
124 static struct module *find_module(const char *modname)
128 for (mod = modules; mod; mod = mod->next)
129 if (strcmp(mod->name, modname) == 0)
134 static struct module *new_module(const char *modname)
139 mod = NOFAIL(malloc(sizeof(*mod)));
140 memset(mod, 0, sizeof(*mod));
141 p = NOFAIL(strdup(modname));
143 /* strip trailing .o */
144 if (strends(p, ".o")) {
145 p[strlen(p) - 2] = '\0';
151 mod->gpl_compatible = -1;
158 /* A hash of all exported symbols,
159 * struct symbol is also used for lists of unresolved symbols */
161 #define SYMBOL_HASH_SIZE 1024
165 struct module *module;
170 unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
171 unsigned int kernel:1; /* 1 if symbol is from kernel
172 * (only for external modules) **/
173 unsigned int is_static:1; /* 1 if symbol is not global */
174 enum export export; /* Type of export */
178 static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
180 /* This is based on the hash agorithm from gdbm, via tdb */
181 static inline unsigned int tdb_hash(const char *name)
183 unsigned value; /* Used to compute the hash value. */
184 unsigned i; /* Used to cycle through random values. */
186 /* Set the initial value from the key size. */
187 for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
188 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
190 return (1103515243 * value + 12345);
194 * Allocate a new symbols for use in the hash of exported symbols or
195 * the list of unresolved symbols per module
197 static struct symbol *alloc_symbol(const char *name, unsigned int weak,
200 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
202 memset(s, 0, sizeof(*s));
203 strcpy(s->name, name);
210 /* For the hash of exported symbols */
211 static struct symbol *new_symbol(const char *name, struct module *module,
216 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
217 symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
219 return symbolhash[hash];
222 static struct symbol *find_symbol(const char *name)
226 /* For our purposes, .foo matches foo. PPC64 needs this. */
230 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
231 if (strcmp(s->name, name) == 0)
237 static bool contains_namespace(struct namespace_list *list,
238 const char *namespace)
240 for (; list; list = list->next)
241 if (!strcmp(list->namespace, namespace))
247 static void add_namespace(struct namespace_list **list, const char *namespace)
249 struct namespace_list *ns_entry;
251 if (!contains_namespace(*list, namespace)) {
252 ns_entry = NOFAIL(malloc(sizeof(struct namespace_list) +
253 strlen(namespace) + 1));
254 strcpy(ns_entry->namespace, namespace);
255 ns_entry->next = *list;
260 static bool module_imports_namespace(struct module *module,
261 const char *namespace)
263 return contains_namespace(module->imported_namespaces, namespace);
266 static const struct {
270 { .str = "EXPORT_SYMBOL", .export = export_plain },
271 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
272 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
273 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
274 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
275 { .str = "(unknown)", .export = export_unknown },
279 static const char *export_str(enum export ex)
281 return export_list[ex].str;
284 static enum export export_no(const char *s)
289 return export_unknown;
290 for (i = 0; export_list[i].export != export_unknown; i++) {
291 if (strcmp(export_list[i].str, s) == 0)
292 return export_list[i].export;
294 return export_unknown;
297 static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
299 return (void *)elf->hdr +
300 elf->sechdrs[elf->secindex_strings].sh_offset +
304 static const char *sec_name(struct elf_info *elf, int secindex)
306 return sech_name(elf, &elf->sechdrs[secindex]);
309 static void *sym_get_data(const struct elf_info *info, const Elf_Sym *sym)
311 unsigned int secindex = get_secindex(info, sym);
312 Elf_Shdr *sechdr = &info->sechdrs[secindex];
313 unsigned long offset;
315 offset = sym->st_value;
316 if (info->hdr->e_type != ET_REL)
317 offset -= sechdr->sh_addr;
319 return (void *)info->hdr + sechdr->sh_offset + offset;
322 #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
324 static enum export export_from_secname(struct elf_info *elf, unsigned int sec)
326 const char *secname = sec_name(elf, sec);
328 if (strstarts(secname, "___ksymtab+"))
330 else if (strstarts(secname, "___ksymtab_unused+"))
331 return export_unused;
332 else if (strstarts(secname, "___ksymtab_gpl+"))
334 else if (strstarts(secname, "___ksymtab_unused_gpl+"))
335 return export_unused_gpl;
336 else if (strstarts(secname, "___ksymtab_gpl_future+"))
337 return export_gpl_future;
339 return export_unknown;
342 static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
344 if (sec == elf->export_sec)
346 else if (sec == elf->export_unused_sec)
347 return export_unused;
348 else if (sec == elf->export_gpl_sec)
350 else if (sec == elf->export_unused_gpl_sec)
351 return export_unused_gpl;
352 else if (sec == elf->export_gpl_future_sec)
353 return export_gpl_future;
355 return export_unknown;
358 static const char *namespace_from_kstrtabns(const struct elf_info *info,
361 const char *value = sym_get_data(info, sym);
362 return value[0] ? value : NULL;
365 static void sym_update_namespace(const char *symname, const char *namespace)
367 struct symbol *s = find_symbol(symname);
370 * That symbol should have been created earlier and thus this is
371 * actually an assertion.
374 merror("Could not update namespace(%s) for symbol %s\n",
381 namespace && namespace[0] ? NOFAIL(strdup(namespace)) : NULL;
385 * Add an exported symbol - it may have already been added without a
386 * CRC, in this case just update the CRC
388 static struct symbol *sym_add_exported(const char *name, struct module *mod,
391 struct symbol *s = find_symbol(name);
394 s = new_symbol(name, mod, export);
395 } else if (!external_module || is_vmlinux(s->module->name) ||
397 warn("%s: '%s' exported twice. Previous export was in %s%s\n",
398 mod->name, name, s->module->name,
399 is_vmlinux(s->module->name) ? "" : ".ko");
404 s->vmlinux = is_vmlinux(mod->name);
410 static void sym_set_crc(const char *name, unsigned int crc)
412 struct symbol *s = find_symbol(name);
415 * Ignore stand-alone __crc_*, which might be auto-generated symbols
416 * such as __*_veneer in ARM ELF.
425 void *grab_file(const char *filename, unsigned long *size)
428 void *map = MAP_FAILED;
431 fd = open(filename, O_RDONLY);
438 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
442 if (map == MAP_FAILED)
448 * Return a copy of the next line in a mmap'ed file.
449 * spaces in the beginning of the line is trimmed away.
450 * Return a pointer to a static buffer.
452 char *get_next_line(unsigned long *pos, void *file, unsigned long size)
454 static char line[4096];
457 signed char *p = (signed char *)file + *pos;
460 for (; *pos < size ; (*pos)++) {
461 if (skip && isspace(*p)) {
466 if (*p != '\n' && (*pos < size)) {
470 break; /* Too long, stop */
481 void release_file(void *file, unsigned long size)
486 static int parse_elf(struct elf_info *info, const char *filename)
492 const char *secstrings;
493 unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;
495 hdr = grab_file(filename, &info->size);
497 if (ignore_missing_files) {
498 fprintf(stderr, "%s: %s (ignored)\n", filename,
506 if (info->size < sizeof(*hdr)) {
507 /* file too small, assume this is an empty .o file */
510 /* Is this a valid ELF file? */
511 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
512 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
513 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
514 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
515 /* Not an ELF file - silently ignore it */
518 /* Fix endianness in ELF header */
519 hdr->e_type = TO_NATIVE(hdr->e_type);
520 hdr->e_machine = TO_NATIVE(hdr->e_machine);
521 hdr->e_version = TO_NATIVE(hdr->e_version);
522 hdr->e_entry = TO_NATIVE(hdr->e_entry);
523 hdr->e_phoff = TO_NATIVE(hdr->e_phoff);
524 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
525 hdr->e_flags = TO_NATIVE(hdr->e_flags);
526 hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize);
527 hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize);
528 hdr->e_phnum = TO_NATIVE(hdr->e_phnum);
529 hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize);
530 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
531 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
532 sechdrs = (void *)hdr + hdr->e_shoff;
533 info->sechdrs = sechdrs;
535 /* Check if file offset is correct */
536 if (hdr->e_shoff > info->size) {
537 fatal("section header offset=%lu in file '%s' is bigger than "
538 "filesize=%lu\n", (unsigned long)hdr->e_shoff,
539 filename, info->size);
543 if (hdr->e_shnum == SHN_UNDEF) {
545 * There are more than 64k sections,
546 * read count from .sh_size.
548 info->num_sections = TO_NATIVE(sechdrs[0].sh_size);
551 info->num_sections = hdr->e_shnum;
553 if (hdr->e_shstrndx == SHN_XINDEX) {
554 info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link);
557 info->secindex_strings = hdr->e_shstrndx;
560 /* Fix endianness in section headers */
561 for (i = 0; i < info->num_sections; i++) {
562 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
563 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
564 sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags);
565 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
566 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
567 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
568 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
569 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
570 sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign);
571 sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize);
573 /* Find symbol table. */
574 secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset;
575 for (i = 1; i < info->num_sections; i++) {
577 int nobits = sechdrs[i].sh_type == SHT_NOBITS;
579 if (!nobits && sechdrs[i].sh_offset > info->size) {
580 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
581 "sizeof(*hrd)=%zu\n", filename,
582 (unsigned long)sechdrs[i].sh_offset,
586 secname = secstrings + sechdrs[i].sh_name;
587 if (strcmp(secname, ".modinfo") == 0) {
589 fatal("%s has NOBITS .modinfo\n", filename);
590 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
591 info->modinfo_len = sechdrs[i].sh_size;
592 } else if (strcmp(secname, "__ksymtab") == 0)
593 info->export_sec = i;
594 else if (strcmp(secname, "__ksymtab_unused") == 0)
595 info->export_unused_sec = i;
596 else if (strcmp(secname, "__ksymtab_gpl") == 0)
597 info->export_gpl_sec = i;
598 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
599 info->export_unused_gpl_sec = i;
600 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
601 info->export_gpl_future_sec = i;
603 if (sechdrs[i].sh_type == SHT_SYMTAB) {
604 unsigned int sh_link_idx;
606 info->symtab_start = (void *)hdr +
607 sechdrs[i].sh_offset;
608 info->symtab_stop = (void *)hdr +
609 sechdrs[i].sh_offset + sechdrs[i].sh_size;
610 sh_link_idx = sechdrs[i].sh_link;
611 info->strtab = (void *)hdr +
612 sechdrs[sh_link_idx].sh_offset;
615 /* 32bit section no. table? ("more than 64k sections") */
616 if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
617 symtab_shndx_idx = i;
618 info->symtab_shndx_start = (void *)hdr +
619 sechdrs[i].sh_offset;
620 info->symtab_shndx_stop = (void *)hdr +
621 sechdrs[i].sh_offset + sechdrs[i].sh_size;
624 if (!info->symtab_start)
625 fatal("%s has no symtab?\n", filename);
627 /* Fix endianness in symbols */
628 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
629 sym->st_shndx = TO_NATIVE(sym->st_shndx);
630 sym->st_name = TO_NATIVE(sym->st_name);
631 sym->st_value = TO_NATIVE(sym->st_value);
632 sym->st_size = TO_NATIVE(sym->st_size);
635 if (symtab_shndx_idx != ~0U) {
637 if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link)
638 fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
639 filename, sechdrs[symtab_shndx_idx].sh_link,
642 for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
650 static void parse_elf_finish(struct elf_info *info)
652 release_file(info->hdr, info->size);
655 static int ignore_undef_symbol(struct elf_info *info, const char *symname)
657 /* ignore __this_module, it will be resolved shortly */
658 if (strcmp(symname, "__this_module") == 0)
660 /* ignore global offset table */
661 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
663 if (info->hdr->e_machine == EM_PPC)
664 /* Special register function linked on all modules during final link of .ko */
665 if (strstarts(symname, "_restgpr_") ||
666 strstarts(symname, "_savegpr_") ||
667 strstarts(symname, "_rest32gpr_") ||
668 strstarts(symname, "_save32gpr_") ||
669 strstarts(symname, "_restvr_") ||
670 strstarts(symname, "_savevr_"))
672 if (info->hdr->e_machine == EM_PPC64)
673 /* Special register function linked on all modules during final link of .ko */
674 if (strstarts(symname, "_restgpr0_") ||
675 strstarts(symname, "_savegpr0_") ||
676 strstarts(symname, "_restvr_") ||
677 strstarts(symname, "_savevr_") ||
678 strcmp(symname, ".TOC.") == 0)
680 /* Do not ignore this symbol */
684 static void handle_modversion(const struct module *mod,
685 const struct elf_info *info,
686 const Elf_Sym *sym, const char *symname)
690 if (sym->st_shndx == SHN_UNDEF) {
691 warn("EXPORT symbol \"%s\" [%s%s] version generation failed, symbol will not be versioned.\n",
692 symname, mod->name, is_vmlinux(mod->name) ? "":".ko");
696 if (sym->st_shndx == SHN_ABS) {
701 /* symbol points to the CRC in the ELF object */
702 crcp = sym_get_data(info, sym);
703 crc = TO_NATIVE(*crcp);
705 sym_set_crc(symname, crc);
708 static void handle_symbol(struct module *mod, struct elf_info *info,
709 const Elf_Sym *sym, const char *symname)
714 if ((!is_vmlinux(mod->name) || mod->is_dot_o) &&
715 strstarts(symname, "__ksymtab"))
716 export = export_from_secname(info, get_secindex(info, sym));
718 export = export_from_sec(info, get_secindex(info, sym));
720 switch (sym->st_shndx) {
722 if (strstarts(symname, "__gnu_lto_")) {
723 /* Should warn here, but modpost runs before the linker */
725 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
728 /* undefined symbol */
729 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
730 ELF_ST_BIND(sym->st_info) != STB_WEAK)
732 if (ignore_undef_symbol(info, symname))
734 if (info->hdr->e_machine == EM_SPARC ||
735 info->hdr->e_machine == EM_SPARCV9) {
736 /* Ignore register directives. */
737 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
739 if (symname[0] == '.') {
740 char *munged = NOFAIL(strdup(symname));
742 munged[1] = toupper(munged[1]);
747 mod->unres = alloc_symbol(symname,
748 ELF_ST_BIND(sym->st_info) == STB_WEAK,
752 /* All exported symbols */
753 if (strstarts(symname, "__ksymtab_")) {
754 name = symname + strlen("__ksymtab_");
755 sym_add_exported(name, mod, export);
757 if (strcmp(symname, "init_module") == 0)
759 if (strcmp(symname, "cleanup_module") == 0)
760 mod->has_cleanup = 1;
766 * Parse tag=value strings from .modinfo section
768 static char *next_string(char *string, unsigned long *secsize)
770 /* Skip non-zero chars */
773 if ((*secsize)-- <= 1)
777 /* Skip any zero padding. */
780 if ((*secsize)-- <= 1)
786 static char *get_next_modinfo(struct elf_info *info, const char *tag,
790 unsigned int taglen = strlen(tag);
791 char *modinfo = info->modinfo;
792 unsigned long size = info->modinfo_len;
795 size -= prev - modinfo;
796 modinfo = next_string(prev, &size);
799 for (p = modinfo; p; p = next_string(p, &size)) {
800 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
801 return p + taglen + 1;
806 static char *get_modinfo(struct elf_info *info, const char *tag)
809 return get_next_modinfo(info, tag, NULL);
813 * Test if string s ends in string sub
816 static int strrcmp(const char *s, const char *sub)
824 sublen = strlen(sub);
826 if ((slen == 0) || (sublen == 0))
832 return memcmp(s + slen - sublen, sub, sublen);
835 static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
838 return elf->strtab + sym->st_name;
843 /* The pattern is an array of simple patterns.
844 * "foo" will match an exact string equal to "foo"
845 * "*foo" will match a string that ends with "foo"
846 * "foo*" will match a string that begins with "foo"
847 * "*foo*" will match a string that contains "foo"
849 static int match(const char *sym, const char * const pat[])
854 const char *endp = p + strlen(p) - 1;
857 if (*p == '*' && *endp == '*') {
858 char *bare = NOFAIL(strndup(p + 1, strlen(p) - 2));
859 char *here = strstr(sym, bare);
866 else if (*p == '*') {
867 if (strrcmp(sym, p + 1) == 0)
871 else if (*endp == '*') {
872 if (strncmp(sym, p, strlen(p) - 1) == 0)
877 if (strcmp(p, sym) == 0)
885 /* sections that we do not want to do full section mismatch check on */
886 static const char *const section_white_list[] =
890 ".cranges", /* sh64 */
891 ".zdebug*", /* Compressed debug sections. */
892 ".GCC.command.line", /* record-gcc-switches */
893 ".mdebug*", /* alpha, score, mips etc. */
894 ".pdr", /* alpha, score, mips etc. */
899 ".xt.prop", /* xtensa */
900 ".xt.lit", /* xtensa */
901 ".arcextmap*", /* arc */
902 ".gnu.linkonce.arcext*", /* arc : modules */
903 ".cmem*", /* EZchip */
904 ".fmt_slot*", /* EZchip */
911 * This is used to find sections missing the SHF_ALLOC flag.
912 * The cause of this is often a section specified in assembler
913 * without "ax" / "aw".
915 static void check_section(const char *modname, struct elf_info *elf,
918 const char *sec = sech_name(elf, sechdr);
920 if (sechdr->sh_type == SHT_PROGBITS &&
921 !(sechdr->sh_flags & SHF_ALLOC) &&
922 !match(sec, section_white_list)) {
923 warn("%s (%s): unexpected non-allocatable section.\n"
924 "Did you forget to use \"ax\"/\"aw\" in a .S file?\n"
925 "Note that for example <linux/init.h> contains\n"
926 "section definitions for use in .S files.\n\n",
933 #define ALL_INIT_DATA_SECTIONS \
934 ".init.setup", ".init.rodata", ".meminit.rodata", \
935 ".init.data", ".meminit.data"
936 #define ALL_EXIT_DATA_SECTIONS \
937 ".exit.data", ".memexit.data"
939 #define ALL_INIT_TEXT_SECTIONS \
940 ".init.text", ".meminit.text"
941 #define ALL_EXIT_TEXT_SECTIONS \
942 ".exit.text", ".memexit.text"
944 #define ALL_PCI_INIT_SECTIONS \
945 ".pci_fixup_early", ".pci_fixup_header", ".pci_fixup_final", \
946 ".pci_fixup_enable", ".pci_fixup_resume", \
947 ".pci_fixup_resume_early", ".pci_fixup_suspend"
949 #define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS
950 #define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS
952 #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
953 #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
955 #define DATA_SECTIONS ".data", ".data.rel"
956 #define TEXT_SECTIONS ".text", ".text.unlikely", ".sched.text", \
957 ".kprobes.text", ".cpuidle.text"
958 #define OTHER_TEXT_SECTIONS ".ref.text", ".head.text", ".spinlock.text", \
959 ".fixup", ".entry.text", ".exception.text", ".text.*", \
962 #define INIT_SECTIONS ".init.*"
963 #define MEM_INIT_SECTIONS ".meminit.*"
965 #define EXIT_SECTIONS ".exit.*"
966 #define MEM_EXIT_SECTIONS ".memexit.*"
968 #define ALL_TEXT_SECTIONS ALL_INIT_TEXT_SECTIONS, ALL_EXIT_TEXT_SECTIONS, \
969 TEXT_SECTIONS, OTHER_TEXT_SECTIONS
971 /* init data sections */
972 static const char *const init_data_sections[] =
973 { ALL_INIT_DATA_SECTIONS, NULL };
975 /* all init sections */
976 static const char *const init_sections[] = { ALL_INIT_SECTIONS, NULL };
978 /* All init and exit sections (code + data) */
979 static const char *const init_exit_sections[] =
980 {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };
982 /* all text sections */
983 static const char *const text_sections[] = { ALL_TEXT_SECTIONS, NULL };
986 static const char *const data_sections[] = { DATA_SECTIONS, NULL };
989 /* symbols in .data that may refer to init/exit sections */
990 #define DEFAULT_SYMBOL_WHITE_LIST \
992 "*_template", /* scsi uses *_template a lot */ \
993 "*_timer", /* arm uses ops structures named _timer a lot */ \
994 "*_sht", /* scsi also used *_sht to some extent */ \
1000 static const char *const head_sections[] = { ".head.text*", NULL };
1001 static const char *const linker_symbols[] =
1002 { "__init_begin", "_sinittext", "_einittext", NULL };
1003 static const char *const optim_symbols[] = { "*.constprop.*", NULL };
1010 XXXINIT_TO_SOME_INIT,
1011 XXXEXIT_TO_SOME_EXIT,
1012 ANY_INIT_TO_ANY_EXIT,
1013 ANY_EXIT_TO_ANY_INIT,
1014 EXPORT_TO_INIT_EXIT,
1015 EXTABLE_TO_NON_TEXT,
1019 * Describe how to match sections on different criterias:
1021 * @fromsec: Array of sections to be matched.
1023 * @bad_tosec: Relocations applied to a section in @fromsec to a section in
1024 * this array is forbidden (black-list). Can be empty.
1026 * @good_tosec: Relocations applied to a section in @fromsec must be
1027 * targetting sections in this array (white-list). Can be empty.
1029 * @mismatch: Type of mismatch.
1031 * @symbol_white_list: Do not match a relocation to a symbol in this list
1032 * even if it is targetting a section in @bad_to_sec.
1034 * @handler: Specific handler to call when a match is found. If NULL,
1035 * default_mismatch_handler() will be called.
1038 struct sectioncheck {
1039 const char *fromsec[20];
1040 const char *bad_tosec[20];
1041 const char *good_tosec[20];
1042 enum mismatch mismatch;
1043 const char *symbol_white_list[20];
1044 void (*handler)(const char *modname, struct elf_info *elf,
1045 const struct sectioncheck* const mismatch,
1046 Elf_Rela *r, Elf_Sym *sym, const char *fromsec);
1050 static void extable_mismatch_handler(const char *modname, struct elf_info *elf,
1051 const struct sectioncheck* const mismatch,
1052 Elf_Rela *r, Elf_Sym *sym,
1053 const char *fromsec);
1055 static const struct sectioncheck sectioncheck[] = {
1056 /* Do not reference init/exit code/data from
1057 * normal code and data
1060 .fromsec = { TEXT_SECTIONS, NULL },
1061 .bad_tosec = { ALL_INIT_SECTIONS, NULL },
1062 .mismatch = TEXT_TO_ANY_INIT,
1063 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1066 .fromsec = { DATA_SECTIONS, NULL },
1067 .bad_tosec = { ALL_XXXINIT_SECTIONS, NULL },
1068 .mismatch = DATA_TO_ANY_INIT,
1069 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1072 .fromsec = { DATA_SECTIONS, NULL },
1073 .bad_tosec = { INIT_SECTIONS, NULL },
1074 .mismatch = DATA_TO_ANY_INIT,
1075 .symbol_white_list = {
1076 "*_template", "*_timer", "*_sht", "*_ops",
1077 "*_probe", "*_probe_one", "*_console", NULL
1081 .fromsec = { TEXT_SECTIONS, NULL },
1082 .bad_tosec = { ALL_EXIT_SECTIONS, NULL },
1083 .mismatch = TEXT_TO_ANY_EXIT,
1084 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1087 .fromsec = { DATA_SECTIONS, NULL },
1088 .bad_tosec = { ALL_EXIT_SECTIONS, NULL },
1089 .mismatch = DATA_TO_ANY_EXIT,
1090 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1092 /* Do not reference init code/data from meminit code/data */
1094 .fromsec = { ALL_XXXINIT_SECTIONS, NULL },
1095 .bad_tosec = { INIT_SECTIONS, NULL },
1096 .mismatch = XXXINIT_TO_SOME_INIT,
1097 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1099 /* Do not reference exit code/data from memexit code/data */
1101 .fromsec = { ALL_XXXEXIT_SECTIONS, NULL },
1102 .bad_tosec = { EXIT_SECTIONS, NULL },
1103 .mismatch = XXXEXIT_TO_SOME_EXIT,
1104 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1106 /* Do not use exit code/data from init code */
1108 .fromsec = { ALL_INIT_SECTIONS, NULL },
1109 .bad_tosec = { ALL_EXIT_SECTIONS, NULL },
1110 .mismatch = ANY_INIT_TO_ANY_EXIT,
1111 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1113 /* Do not use init code/data from exit code */
1115 .fromsec = { ALL_EXIT_SECTIONS, NULL },
1116 .bad_tosec = { ALL_INIT_SECTIONS, NULL },
1117 .mismatch = ANY_EXIT_TO_ANY_INIT,
1118 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1121 .fromsec = { ALL_PCI_INIT_SECTIONS, NULL },
1122 .bad_tosec = { INIT_SECTIONS, NULL },
1123 .mismatch = ANY_INIT_TO_ANY_EXIT,
1124 .symbol_white_list = { NULL },
1126 /* Do not export init/exit functions or data */
1128 .fromsec = { "__ksymtab*", NULL },
1129 .bad_tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
1130 .mismatch = EXPORT_TO_INIT_EXIT,
1131 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1134 .fromsec = { "__ex_table", NULL },
1135 /* If you're adding any new black-listed sections in here, consider
1136 * adding a special 'printer' for them in scripts/check_extable.
1138 .bad_tosec = { ".altinstr_replacement", NULL },
1139 .good_tosec = {ALL_TEXT_SECTIONS , NULL},
1140 .mismatch = EXTABLE_TO_NON_TEXT,
1141 .handler = extable_mismatch_handler,
1145 static const struct sectioncheck *section_mismatch(
1146 const char *fromsec, const char *tosec)
1149 int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
1150 const struct sectioncheck *check = §ioncheck[0];
1153 * The target section could be the SHT_NUL section when we're
1154 * handling relocations to un-resolved symbols, trying to match it
1155 * doesn't make much sense and causes build failures on parisc
1161 for (i = 0; i < elems; i++) {
1162 if (match(fromsec, check->fromsec)) {
1163 if (check->bad_tosec[0] && match(tosec, check->bad_tosec))
1165 if (check->good_tosec[0] && !match(tosec, check->good_tosec))
1174 * Whitelist to allow certain references to pass with no warning.
1177 * If a module parameter is declared __initdata and permissions=0
1178 * then this is legal despite the warning generated.
1179 * We cannot see value of permissions here, so just ignore
1181 * The pattern is identified by:
1182 * tosec = .init.data
1187 * module_param_call() ops can refer to __init set function if permissions=0
1188 * The pattern is identified by:
1189 * tosec = .init.text
1191 * atsym = __param_ops_*
1194 * Many drivers utilise a *driver container with references to
1195 * add, remove, probe functions etc.
1196 * the pattern is identified by:
1197 * tosec = init or exit section
1198 * fromsec = data section
1199 * atsym = *driver, *_template, *_sht, *_ops, *_probe,
1200 * *probe_one, *_console, *_timer
1203 * Whitelist all references from .head.text to any init section
1206 * Some symbols belong to init section but still it is ok to reference
1207 * these from non-init sections as these symbols don't have any memory
1208 * allocated for them and symbol address and value are same. So even
1209 * if init section is freed, its ok to reference those symbols.
1210 * For ex. symbols marking the init section boundaries.
1211 * This pattern is identified by
1212 * refsymname = __init_begin, _sinittext, _einittext
1215 * GCC may optimize static inlines when fed constant arg(s) resulting
1216 * in functions like cpumask_empty() -- generating an associated symbol
1217 * cpumask_empty.constprop.3 that appears in the audit. If the const that
1218 * is passed in comes from __init, like say nmi_ipi_mask, we get a
1219 * meaningless section warning. May need to add isra symbols too...
1220 * This pattern is identified by
1221 * tosec = init section
1222 * fromsec = text section
1223 * refsymname = *.constprop.*
1226 * Hide section mismatch warnings for ELF local symbols. The goal
1227 * is to eliminate false positive modpost warnings caused by
1228 * compiler-generated ELF local symbol names such as ".LANCHOR1".
1229 * Autogenerated symbol names bypass modpost's "Pattern 2"
1230 * whitelisting, which relies on pattern-matching against symbol
1231 * names to work. (One situation where gcc can autogenerate ELF
1232 * local symbols is when "-fsection-anchors" is used.)
1234 static int secref_whitelist(const struct sectioncheck *mismatch,
1235 const char *fromsec, const char *fromsym,
1236 const char *tosec, const char *tosym)
1238 /* Check for pattern 1 */
1239 if (match(tosec, init_data_sections) &&
1240 match(fromsec, data_sections) &&
1241 strstarts(fromsym, "__param"))
1244 /* Check for pattern 1a */
1245 if (strcmp(tosec, ".init.text") == 0 &&
1246 match(fromsec, data_sections) &&
1247 strstarts(fromsym, "__param_ops_"))
1250 /* Check for pattern 2 */
1251 if (match(tosec, init_exit_sections) &&
1252 match(fromsec, data_sections) &&
1253 match(fromsym, mismatch->symbol_white_list))
1256 /* Check for pattern 3 */
1257 if (match(fromsec, head_sections) &&
1258 match(tosec, init_sections))
1261 /* Check for pattern 4 */
1262 if (match(tosym, linker_symbols))
1265 /* Check for pattern 5 */
1266 if (match(fromsec, text_sections) &&
1267 match(tosec, init_sections) &&
1268 match(fromsym, optim_symbols))
1271 /* Check for pattern 6 */
1272 if (strstarts(fromsym, ".L"))
1278 static inline int is_arm_mapping_symbol(const char *str)
1280 return str[0] == '$' && strchr("axtd", str[1])
1281 && (str[2] == '\0' || str[2] == '.');
1285 * If there's no name there, ignore it; likewise, ignore it if it's
1286 * one of the magic symbols emitted used by current ARM tools.
1288 * Otherwise if find_symbols_between() returns those symbols, they'll
1289 * fail the whitelist tests and cause lots of false alarms ... fixable
1290 * only by merging __exit and __init sections into __text, bloating
1291 * the kernel (which is especially evil on embedded platforms).
1293 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
1295 const char *name = elf->strtab + sym->st_name;
1297 if (!name || !strlen(name))
1299 return !is_arm_mapping_symbol(name);
1303 * Find symbol based on relocation record info.
1304 * In some cases the symbol supplied is a valid symbol so
1305 * return refsym. If st_name != 0 we assume this is a valid symbol.
1306 * In other cases the symbol needs to be looked up in the symbol table
1307 * based on section and address.
1309 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
1313 Elf_Sym *near = NULL;
1314 Elf64_Sword distance = 20;
1316 unsigned int relsym_secindex;
1318 if (relsym->st_name != 0)
1321 relsym_secindex = get_secindex(elf, relsym);
1322 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1323 if (get_secindex(elf, sym) != relsym_secindex)
1325 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
1327 if (!is_valid_name(elf, sym))
1329 if (sym->st_value == addr)
1331 /* Find a symbol nearby - addr are maybe negative */
1332 d = sym->st_value - addr;
1334 d = addr - sym->st_value;
1340 /* We need a close match */
1348 * Find symbols before or equal addr and after addr - in the section sec.
1349 * If we find two symbols with equal offset prefer one with a valid name.
1350 * The ELF format may have a better way to detect what type of symbol
1351 * it is, but this works for now.
1353 static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
1357 Elf_Sym *near = NULL;
1358 Elf_Addr distance = ~0;
1360 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1363 if (is_shndx_special(sym->st_shndx))
1365 symsec = sec_name(elf, get_secindex(elf, sym));
1366 if (strcmp(symsec, sec) != 0)
1368 if (!is_valid_name(elf, sym))
1370 if (sym->st_value <= addr) {
1371 if ((addr - sym->st_value) < distance) {
1372 distance = addr - sym->st_value;
1374 } else if ((addr - sym->st_value) == distance) {
1383 * Convert a section name to the function/data attribute
1384 * .init.text => __init
1385 * .memexitconst => __memconst
1388 * The memory of returned value has been allocated on a heap. The user of this
1389 * method should free it after usage.
1391 static char *sec2annotation(const char *s)
1393 if (match(s, init_exit_sections)) {
1394 char *p = NOFAIL(malloc(20));
1401 while (*s && *s != '.')
1406 if (strstr(s, "rodata") != NULL)
1407 strcat(p, "const ");
1408 else if (strstr(s, "data") != NULL)
1414 return NOFAIL(strdup(""));
1418 static int is_function(Elf_Sym *sym)
1421 return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
1426 static void print_section_list(const char * const list[20])
1428 const char *const *s = list;
1431 fprintf(stderr, "%s", *s);
1434 fprintf(stderr, ", ");
1436 fprintf(stderr, "\n");
1439 static inline void get_pretty_name(int is_func, const char** name, const char** name_p)
1442 case 0: *name = "variable"; *name_p = ""; break;
1443 case 1: *name = "function"; *name_p = "()"; break;
1444 default: *name = "(unknown reference)"; *name_p = ""; break;
1449 * Print a warning about a section mismatch.
1450 * Try to find symbols near it so user can find it.
1451 * Check whitelist before warning - it may be a false positive.
1453 static void report_sec_mismatch(const char *modname,
1454 const struct sectioncheck *mismatch,
1455 const char *fromsec,
1456 unsigned long long fromaddr,
1457 const char *fromsym,
1459 const char *tosec, const char *tosym,
1462 const char *from, *from_p;
1463 const char *to, *to_p;
1467 sec_mismatch_count++;
1469 get_pretty_name(from_is_func, &from, &from_p);
1470 get_pretty_name(to_is_func, &to, &to_p);
1472 warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s "
1473 "to the %s %s:%s%s\n",
1474 modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec,
1477 switch (mismatch->mismatch) {
1478 case TEXT_TO_ANY_INIT:
1479 prl_from = sec2annotation(fromsec);
1480 prl_to = sec2annotation(tosec);
1482 "The function %s%s() references\n"
1484 "This is often because %s lacks a %s\n"
1485 "annotation or the annotation of %s is wrong.\n",
1487 to, prl_to, tosym, to_p,
1488 fromsym, prl_to, tosym);
1492 case DATA_TO_ANY_INIT: {
1493 prl_to = sec2annotation(tosec);
1495 "The variable %s references\n"
1497 "If the reference is valid then annotate the\n"
1498 "variable with __init* or __refdata (see linux/init.h) "
1499 "or name the variable:\n",
1500 fromsym, to, prl_to, tosym, to_p);
1501 print_section_list(mismatch->symbol_white_list);
1505 case TEXT_TO_ANY_EXIT:
1506 prl_to = sec2annotation(tosec);
1508 "The function %s() references a %s in an exit section.\n"
1509 "Often the %s %s%s has valid usage outside the exit section\n"
1510 "and the fix is to remove the %sannotation of %s.\n",
1511 fromsym, to, to, tosym, to_p, prl_to, tosym);
1514 case DATA_TO_ANY_EXIT: {
1515 prl_to = sec2annotation(tosec);
1517 "The variable %s references\n"
1519 "If the reference is valid then annotate the\n"
1520 "variable with __exit* (see linux/init.h) or "
1521 "name the variable:\n",
1522 fromsym, to, prl_to, tosym, to_p);
1523 print_section_list(mismatch->symbol_white_list);
1527 case XXXINIT_TO_SOME_INIT:
1528 case XXXEXIT_TO_SOME_EXIT:
1529 prl_from = sec2annotation(fromsec);
1530 prl_to = sec2annotation(tosec);
1532 "The %s %s%s%s references\n"
1534 "If %s is only used by %s then\n"
1535 "annotate %s with a matching annotation.\n",
1536 from, prl_from, fromsym, from_p,
1537 to, prl_to, tosym, to_p,
1538 tosym, fromsym, tosym);
1542 case ANY_INIT_TO_ANY_EXIT:
1543 prl_from = sec2annotation(fromsec);
1544 prl_to = sec2annotation(tosec);
1546 "The %s %s%s%s references\n"
1548 "This is often seen when error handling "
1549 "in the init function\n"
1550 "uses functionality in the exit path.\n"
1551 "The fix is often to remove the %sannotation of\n"
1552 "%s%s so it may be used outside an exit section.\n",
1553 from, prl_from, fromsym, from_p,
1554 to, prl_to, tosym, to_p,
1555 prl_to, tosym, to_p);
1559 case ANY_EXIT_TO_ANY_INIT:
1560 prl_from = sec2annotation(fromsec);
1561 prl_to = sec2annotation(tosec);
1563 "The %s %s%s%s references\n"
1565 "This is often seen when error handling "
1566 "in the exit function\n"
1567 "uses functionality in the init path.\n"
1568 "The fix is often to remove the %sannotation of\n"
1569 "%s%s so it may be used outside an init section.\n",
1570 from, prl_from, fromsym, from_p,
1571 to, prl_to, tosym, to_p,
1572 prl_to, tosym, to_p);
1576 case EXPORT_TO_INIT_EXIT:
1577 prl_to = sec2annotation(tosec);
1579 "The symbol %s is exported and annotated %s\n"
1580 "Fix this by removing the %sannotation of %s "
1581 "or drop the export.\n",
1582 tosym, prl_to, prl_to, tosym);
1585 case EXTABLE_TO_NON_TEXT:
1586 fatal("There's a special handler for this mismatch type, "
1587 "we should never get here.");
1590 fprintf(stderr, "\n");
1593 static void default_mismatch_handler(const char *modname, struct elf_info *elf,
1594 const struct sectioncheck* const mismatch,
1595 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1601 const char *fromsym;
1603 from = find_elf_symbol2(elf, r->r_offset, fromsec);
1604 fromsym = sym_name(elf, from);
1606 if (strstarts(fromsym, "reference___initcall"))
1609 tosec = sec_name(elf, get_secindex(elf, sym));
1610 to = find_elf_symbol(elf, r->r_addend, sym);
1611 tosym = sym_name(elf, to);
1613 /* check whitelist - we may ignore it */
1614 if (secref_whitelist(mismatch,
1615 fromsec, fromsym, tosec, tosym)) {
1616 report_sec_mismatch(modname, mismatch,
1617 fromsec, r->r_offset, fromsym,
1618 is_function(from), tosec, tosym,
1623 static int is_executable_section(struct elf_info* elf, unsigned int section_index)
1625 if (section_index > elf->num_sections)
1626 fatal("section_index is outside elf->num_sections!\n");
1628 return ((elf->sechdrs[section_index].sh_flags & SHF_EXECINSTR) == SHF_EXECINSTR);
1632 * We rely on a gross hack in section_rel[a]() calling find_extable_entry_size()
1633 * to know the sizeof(struct exception_table_entry) for the target architecture.
1635 static unsigned int extable_entry_size = 0;
1636 static void find_extable_entry_size(const char* const sec, const Elf_Rela* r)
1639 * If we're currently checking the second relocation within __ex_table,
1640 * that relocation offset tells us the offsetof(struct
1641 * exception_table_entry, fixup) which is equal to sizeof(struct
1642 * exception_table_entry) divided by two. We use that to our advantage
1643 * since there's no portable way to get that size as every architecture
1644 * seems to go with different sized types. Not pretty but better than
1645 * hard-coding the size for every architecture..
1647 if (!extable_entry_size)
1648 extable_entry_size = r->r_offset * 2;
1651 static inline bool is_extable_fault_address(Elf_Rela *r)
1654 * extable_entry_size is only discovered after we've handled the
1655 * _second_ relocation in __ex_table, so only abort when we're not
1656 * handling the first reloc and extable_entry_size is zero.
1658 if (r->r_offset && extable_entry_size == 0)
1659 fatal("extable_entry size hasn't been discovered!\n");
1661 return ((r->r_offset == 0) ||
1662 (r->r_offset % extable_entry_size == 0));
1665 #define is_second_extable_reloc(Start, Cur, Sec) \
1666 (((Cur) == (Start) + 1) && (strcmp("__ex_table", (Sec)) == 0))
1668 static void report_extable_warnings(const char* modname, struct elf_info* elf,
1669 const struct sectioncheck* const mismatch,
1670 Elf_Rela* r, Elf_Sym* sym,
1671 const char* fromsec, const char* tosec)
1673 Elf_Sym* fromsym = find_elf_symbol2(elf, r->r_offset, fromsec);
1674 const char* fromsym_name = sym_name(elf, fromsym);
1675 Elf_Sym* tosym = find_elf_symbol(elf, r->r_addend, sym);
1676 const char* tosym_name = sym_name(elf, tosym);
1677 const char* from_pretty_name;
1678 const char* from_pretty_name_p;
1679 const char* to_pretty_name;
1680 const char* to_pretty_name_p;
1682 get_pretty_name(is_function(fromsym),
1683 &from_pretty_name, &from_pretty_name_p);
1684 get_pretty_name(is_function(tosym),
1685 &to_pretty_name, &to_pretty_name_p);
1687 warn("%s(%s+0x%lx): Section mismatch in reference"
1688 " from the %s %s%s to the %s %s:%s%s\n",
1689 modname, fromsec, (long)r->r_offset, from_pretty_name,
1690 fromsym_name, from_pretty_name_p,
1691 to_pretty_name, tosec, tosym_name, to_pretty_name_p);
1693 if (!match(tosec, mismatch->bad_tosec) &&
1694 is_executable_section(elf, get_secindex(elf, sym)))
1696 "The relocation at %s+0x%lx references\n"
1697 "section \"%s\" which is not in the list of\n"
1698 "authorized sections. If you're adding a new section\n"
1699 "and/or if this reference is valid, add \"%s\" to the\n"
1700 "list of authorized sections to jump to on fault.\n"
1701 "This can be achieved by adding \"%s\" to \n"
1702 "OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.\n",
1703 fromsec, (long)r->r_offset, tosec, tosec, tosec);
1706 static void extable_mismatch_handler(const char* modname, struct elf_info *elf,
1707 const struct sectioncheck* const mismatch,
1708 Elf_Rela* r, Elf_Sym* sym,
1709 const char *fromsec)
1711 const char* tosec = sec_name(elf, get_secindex(elf, sym));
1713 sec_mismatch_count++;
1715 report_extable_warnings(modname, elf, mismatch, r, sym, fromsec, tosec);
1717 if (match(tosec, mismatch->bad_tosec))
1718 fatal("The relocation at %s+0x%lx references\n"
1719 "section \"%s\" which is black-listed.\n"
1720 "Something is seriously wrong and should be fixed.\n"
1721 "You might get more information about where this is\n"
1722 "coming from by using scripts/check_extable.sh %s\n",
1723 fromsec, (long)r->r_offset, tosec, modname);
1724 else if (!is_executable_section(elf, get_secindex(elf, sym))) {
1725 if (is_extable_fault_address(r))
1726 fatal("The relocation at %s+0x%lx references\n"
1727 "section \"%s\" which is not executable, IOW\n"
1728 "it is not possible for the kernel to fault\n"
1729 "at that address. Something is seriously wrong\n"
1730 "and should be fixed.\n",
1731 fromsec, (long)r->r_offset, tosec);
1733 fatal("The relocation at %s+0x%lx references\n"
1734 "section \"%s\" which is not executable, IOW\n"
1735 "the kernel will fault if it ever tries to\n"
1736 "jump to it. Something is seriously wrong\n"
1737 "and should be fixed.\n",
1738 fromsec, (long)r->r_offset, tosec);
1742 static void check_section_mismatch(const char *modname, struct elf_info *elf,
1743 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1745 const char *tosec = sec_name(elf, get_secindex(elf, sym));
1746 const struct sectioncheck *mismatch = section_mismatch(fromsec, tosec);
1749 if (mismatch->handler)
1750 mismatch->handler(modname, elf, mismatch,
1753 default_mismatch_handler(modname, elf, mismatch,
1758 static unsigned int *reloc_location(struct elf_info *elf,
1759 Elf_Shdr *sechdr, Elf_Rela *r)
1761 Elf_Shdr *sechdrs = elf->sechdrs;
1762 int section = sechdr->sh_info;
1764 return (void *)elf->hdr + sechdrs[section].sh_offset +
1768 static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1770 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1771 unsigned int *location = reloc_location(elf, sechdr, r);
1775 r->r_addend = TO_NATIVE(*location);
1778 r->r_addend = TO_NATIVE(*location) + 4;
1779 /* For CONFIG_RELOCATABLE=y */
1780 if (elf->hdr->e_type == ET_EXEC)
1781 r->r_addend += r->r_offset;
1788 #define R_ARM_CALL 28
1790 #ifndef R_ARM_JUMP24
1791 #define R_ARM_JUMP24 29
1794 #ifndef R_ARM_THM_CALL
1795 #define R_ARM_THM_CALL 10
1797 #ifndef R_ARM_THM_JUMP24
1798 #define R_ARM_THM_JUMP24 30
1800 #ifndef R_ARM_THM_JUMP19
1801 #define R_ARM_THM_JUMP19 51
1804 static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1806 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1810 /* From ARM ABI: (S + A) | T */
1811 r->r_addend = (int)(long)
1812 (elf->symtab_start + ELF_R_SYM(r->r_info));
1817 case R_ARM_THM_CALL:
1818 case R_ARM_THM_JUMP24:
1819 case R_ARM_THM_JUMP19:
1820 /* From ARM ABI: ((S + A) | T) - P */
1821 r->r_addend = (int)(long)(elf->hdr +
1823 (r->r_offset - sechdr->sh_addr));
1831 static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1833 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1834 unsigned int *location = reloc_location(elf, sechdr, r);
1837 if (r_typ == R_MIPS_HI16)
1838 return 1; /* skip this */
1839 inst = TO_NATIVE(*location);
1842 r->r_addend = inst & 0xffff;
1845 r->r_addend = (inst & 0x03ffffff) << 2;
1854 static void section_rela(const char *modname, struct elf_info *elf,
1861 const char *fromsec;
1863 Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
1864 Elf_Rela *stop = (void *)start + sechdr->sh_size;
1866 fromsec = sech_name(elf, sechdr);
1867 fromsec += strlen(".rela");
1868 /* if from section (name) is know good then skip it */
1869 if (match(fromsec, section_white_list))
1872 for (rela = start; rela < stop; rela++) {
1873 r.r_offset = TO_NATIVE(rela->r_offset);
1874 #if KERNEL_ELFCLASS == ELFCLASS64
1875 if (elf->hdr->e_machine == EM_MIPS) {
1877 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
1878 r_sym = TO_NATIVE(r_sym);
1879 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1880 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1882 r.r_info = TO_NATIVE(rela->r_info);
1883 r_sym = ELF_R_SYM(r.r_info);
1886 r.r_info = TO_NATIVE(rela->r_info);
1887 r_sym = ELF_R_SYM(r.r_info);
1889 r.r_addend = TO_NATIVE(rela->r_addend);
1890 sym = elf->symtab_start + r_sym;
1891 /* Skip special sections */
1892 if (is_shndx_special(sym->st_shndx))
1894 if (is_second_extable_reloc(start, rela, fromsec))
1895 find_extable_entry_size(fromsec, &r);
1896 check_section_mismatch(modname, elf, &r, sym, fromsec);
1900 static void section_rel(const char *modname, struct elf_info *elf,
1907 const char *fromsec;
1909 Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
1910 Elf_Rel *stop = (void *)start + sechdr->sh_size;
1912 fromsec = sech_name(elf, sechdr);
1913 fromsec += strlen(".rel");
1914 /* if from section (name) is know good then skip it */
1915 if (match(fromsec, section_white_list))
1918 for (rel = start; rel < stop; rel++) {
1919 r.r_offset = TO_NATIVE(rel->r_offset);
1920 #if KERNEL_ELFCLASS == ELFCLASS64
1921 if (elf->hdr->e_machine == EM_MIPS) {
1923 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1924 r_sym = TO_NATIVE(r_sym);
1925 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1926 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1928 r.r_info = TO_NATIVE(rel->r_info);
1929 r_sym = ELF_R_SYM(r.r_info);
1932 r.r_info = TO_NATIVE(rel->r_info);
1933 r_sym = ELF_R_SYM(r.r_info);
1936 switch (elf->hdr->e_machine) {
1938 if (addend_386_rel(elf, sechdr, &r))
1942 if (addend_arm_rel(elf, sechdr, &r))
1946 if (addend_mips_rel(elf, sechdr, &r))
1950 sym = elf->symtab_start + r_sym;
1951 /* Skip special sections */
1952 if (is_shndx_special(sym->st_shndx))
1954 if (is_second_extable_reloc(start, rel, fromsec))
1955 find_extable_entry_size(fromsec, &r);
1956 check_section_mismatch(modname, elf, &r, sym, fromsec);
1961 * A module includes a number of sections that are discarded
1962 * either when loaded or when used as built-in.
1963 * For loaded modules all functions marked __init and all data
1964 * marked __initdata will be discarded when the module has been initialized.
1965 * Likewise for modules used built-in the sections marked __exit
1966 * are discarded because __exit marked function are supposed to be called
1967 * only when a module is unloaded which never happens for built-in modules.
1968 * The check_sec_ref() function traverses all relocation records
1969 * to find all references to a section that reference a section that will
1970 * be discarded and warns about it.
1972 static void check_sec_ref(struct module *mod, const char *modname,
1973 struct elf_info *elf)
1976 Elf_Shdr *sechdrs = elf->sechdrs;
1978 /* Walk through all sections */
1979 for (i = 0; i < elf->num_sections; i++) {
1980 check_section(modname, elf, &elf->sechdrs[i]);
1981 /* We want to process only relocation sections and not .init */
1982 if (sechdrs[i].sh_type == SHT_RELA)
1983 section_rela(modname, elf, &elf->sechdrs[i]);
1984 else if (sechdrs[i].sh_type == SHT_REL)
1985 section_rel(modname, elf, &elf->sechdrs[i]);
1989 static char *remove_dot(char *s)
1991 size_t n = strcspn(s, ".");
1994 size_t m = strspn(s + n + 1, "0123456789");
1995 if (m && (s[n + m] == '.' || s[n + m] == 0))
2001 static void read_symbols(const char *modname)
2003 const char *symname;
2008 struct elf_info info = { };
2011 if (!parse_elf(&info, modname))
2014 mod = new_module(modname);
2016 /* When there's no vmlinux, don't print warnings about
2017 * unresolved symbols (since there'll be too many ;) */
2018 if (is_vmlinux(modname)) {
2023 license = get_modinfo(&info, "license");
2024 if (!license && !is_vmlinux(modname))
2025 warn("modpost: missing MODULE_LICENSE() in %s\n"
2026 "see include/linux/module.h for "
2027 "more information\n", modname);
2029 if (license_is_gpl_compatible(license))
2030 mod->gpl_compatible = 1;
2032 mod->gpl_compatible = 0;
2035 license = get_next_modinfo(&info, "license", license);
2038 namespace = get_modinfo(&info, "import_ns");
2040 add_namespace(&mod->imported_namespaces, namespace);
2041 namespace = get_next_modinfo(&info, "import_ns", namespace);
2044 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
2045 symname = remove_dot(info.strtab + sym->st_name);
2047 handle_symbol(mod, &info, sym, symname);
2048 handle_moddevtable(mod, &info, sym, symname);
2051 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
2052 symname = remove_dot(info.strtab + sym->st_name);
2054 /* Apply symbol namespaces from __kstrtabns_<symbol> entries. */
2055 if (strstarts(symname, "__kstrtabns_"))
2056 sym_update_namespace(symname + strlen("__kstrtabns_"),
2057 namespace_from_kstrtabns(&info,
2060 if (strstarts(symname, "__crc_"))
2061 handle_modversion(mod, &info, sym,
2062 symname + strlen("__crc_"));
2065 // check for static EXPORT_SYMBOL_* functions && global vars
2066 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
2067 unsigned char bind = ELF_ST_BIND(sym->st_info);
2069 if (bind == STB_GLOBAL || bind == STB_WEAK) {
2071 find_symbol(remove_dot(info.strtab +
2079 if (!is_vmlinux(modname) || vmlinux_section_warnings)
2080 check_sec_ref(mod, modname, &info);
2082 version = get_modinfo(&info, "version");
2084 maybe_frob_rcs_version(modname, version, info.modinfo,
2085 version - (char *)info.hdr);
2086 if (version || (all_versions && !is_vmlinux(modname)))
2087 get_src_version(modname, mod->srcversion,
2088 sizeof(mod->srcversion)-1);
2090 parse_elf_finish(&info);
2092 /* Our trick to get versioning for module struct etc. - it's
2093 * never passed as an argument to an exported function, so
2094 * the automatic versioning doesn't pick it up, but it's really
2095 * important anyhow */
2097 mod->unres = alloc_symbol("module_layout", 0, mod->unres);
2100 static void read_symbols_from_files(const char *filename)
2103 char fname[PATH_MAX];
2105 if (strcmp(filename, "-") != 0) {
2106 in = fopen(filename, "r");
2108 fatal("Can't open filenames file %s: %m", filename);
2111 while (fgets(fname, PATH_MAX, in) != NULL) {
2112 if (strends(fname, "\n"))
2113 fname[strlen(fname)-1] = '\0';
2114 read_symbols(fname);
2123 /* We first write the generated file into memory using the
2124 * following helper, then compare to the file on disk and
2125 * only update the later if anything changed */
2127 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
2128 const char *fmt, ...)
2135 len = vsnprintf(tmp, SZ, fmt, ap);
2136 buf_write(buf, tmp, len);
2140 void buf_write(struct buffer *buf, const char *s, int len)
2142 if (buf->size - buf->pos < len) {
2143 buf->size += len + SZ;
2144 buf->p = NOFAIL(realloc(buf->p, buf->size));
2146 strncpy(buf->p + buf->pos, s, len);
2150 static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
2152 const char *e = is_vmlinux(m) ?"":".ko";
2156 fatal("modpost: GPL-incompatible module %s%s "
2157 "uses GPL-only symbol '%s'\n", m, e, s);
2159 case export_unused_gpl:
2160 fatal("modpost: GPL-incompatible module %s%s "
2161 "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
2163 case export_gpl_future:
2164 warn("modpost: GPL-incompatible module %s%s "
2165 "uses future GPL-only symbol '%s'\n", m, e, s);
2169 case export_unknown:
2175 static void check_for_unused(enum export exp, const char *m, const char *s)
2177 const char *e = is_vmlinux(m) ?"":".ko";
2181 case export_unused_gpl:
2182 warn("modpost: module %s%s "
2183 "uses symbol '%s' marked UNUSED\n", m, e, s);
2191 static int check_exports(struct module *mod)
2193 struct symbol *s, *exp;
2196 for (s = mod->unres; s; s = s->next) {
2197 const char *basename;
2198 exp = find_symbol(s->name);
2199 if (!exp || exp->module == mod) {
2200 if (have_vmlinux && !s->weak) {
2201 if (warn_unresolved) {
2202 warn("\"%s\" [%s.ko] undefined!\n",
2203 s->name, mod->name);
2205 merror("\"%s\" [%s.ko] undefined!\n",
2206 s->name, mod->name);
2212 basename = strrchr(mod->name, '/');
2216 basename = mod->name;
2218 if (exp->namespace &&
2219 !module_imports_namespace(mod, exp->namespace)) {
2220 warn("module %s uses symbol %s from namespace %s, but does not import it.\n",
2221 basename, exp->name, exp->namespace);
2222 add_namespace(&mod->missing_namespaces, exp->namespace);
2225 if (!mod->gpl_compatible)
2226 check_for_gpl_usage(exp->export, basename, exp->name);
2227 check_for_unused(exp->export, basename, exp->name);
2233 static int check_modname_len(struct module *mod)
2235 const char *mod_name;
2237 mod_name = strrchr(mod->name, '/');
2238 if (mod_name == NULL)
2239 mod_name = mod->name;
2242 if (strlen(mod_name) >= MODULE_NAME_LEN) {
2243 merror("module name is too long [%s.ko]\n", mod->name);
2251 * Header for the generated file
2253 static void add_header(struct buffer *b, struct module *mod)
2255 buf_printf(b, "#include <linux/module.h>\n");
2257 * Include build-salt.h after module.h in order to
2258 * inherit the definitions.
2260 buf_printf(b, "#include <linux/build-salt.h>\n");
2261 buf_printf(b, "#include <linux/vermagic.h>\n");
2262 buf_printf(b, "#include <linux/compiler.h>\n");
2263 buf_printf(b, "\n");
2264 buf_printf(b, "BUILD_SALT;\n");
2265 buf_printf(b, "\n");
2266 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
2267 buf_printf(b, "MODULE_INFO(name, KBUILD_MODNAME);\n");
2268 buf_printf(b, "\n");
2269 buf_printf(b, "__visible struct module __this_module\n");
2270 buf_printf(b, "__section(.gnu.linkonce.this_module) = {\n");
2271 buf_printf(b, "\t.name = KBUILD_MODNAME,\n");
2273 buf_printf(b, "\t.init = init_module,\n");
2274 if (mod->has_cleanup)
2275 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
2276 "\t.exit = cleanup_module,\n"
2278 buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n");
2279 buf_printf(b, "};\n");
2282 static void add_intree_flag(struct buffer *b, int is_intree)
2285 buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n");
2288 /* Cannot check for assembler */
2289 static void add_retpoline(struct buffer *b)
2291 buf_printf(b, "\n#ifdef CONFIG_RETPOLINE\n");
2292 buf_printf(b, "MODULE_INFO(retpoline, \"Y\");\n");
2293 buf_printf(b, "#endif\n");
2296 static void add_staging_flag(struct buffer *b, const char *name)
2298 if (strstarts(name, "drivers/staging"))
2299 buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
2303 * Record CRCs for unresolved symbols
2305 static int add_versions(struct buffer *b, struct module *mod)
2307 struct symbol *s, *exp;
2310 for (s = mod->unres; s; s = s->next) {
2311 exp = find_symbol(s->name);
2312 if (!exp || exp->module == mod)
2314 s->module = exp->module;
2315 s->crc_valid = exp->crc_valid;
2322 buf_printf(b, "\n");
2323 buf_printf(b, "static const struct modversion_info ____versions[]\n");
2324 buf_printf(b, "__used __section(__versions) = {\n");
2326 for (s = mod->unres; s; s = s->next) {
2329 if (!s->crc_valid) {
2330 warn("\"%s\" [%s.ko] has no CRC!\n",
2331 s->name, mod->name);
2334 if (strlen(s->name) >= MODULE_NAME_LEN) {
2335 merror("too long symbol \"%s\" [%s.ko]\n",
2336 s->name, mod->name);
2340 buf_printf(b, "\t{ %#8x, \"%s\" },\n",
2344 buf_printf(b, "};\n");
2349 static void add_depends(struct buffer *b, struct module *mod)
2354 /* Clear ->seen flag of modules that own symbols needed by this. */
2355 for (s = mod->unres; s; s = s->next)
2357 s->module->seen = is_vmlinux(s->module->name);
2359 buf_printf(b, "\n");
2360 buf_printf(b, "MODULE_INFO(depends, \"");
2361 for (s = mod->unres; s; s = s->next) {
2366 if (s->module->seen)
2369 s->module->seen = 1;
2370 p = strrchr(s->module->name, '/');
2374 p = s->module->name;
2375 buf_printf(b, "%s%s", first ? "" : ",", p);
2378 buf_printf(b, "\");\n");
2381 static void add_srcversion(struct buffer *b, struct module *mod)
2383 if (mod->srcversion[0]) {
2384 buf_printf(b, "\n");
2385 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
2390 static void write_if_changed(struct buffer *b, const char *fname)
2396 file = fopen(fname, "r");
2400 if (fstat(fileno(file), &st) < 0)
2403 if (st.st_size != b->pos)
2406 tmp = NOFAIL(malloc(b->pos));
2407 if (fread(tmp, 1, b->pos, file) != b->pos)
2410 if (memcmp(tmp, b->p, b->pos) != 0)
2422 file = fopen(fname, "w");
2427 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
2434 /* parse Module.symvers file. line format:
2435 * 0x12345678<tab>symbol<tab>module<tab>export<tab>namespace
2437 static void read_dump(const char *fname, unsigned int kernel)
2439 unsigned long size, pos = 0;
2440 void *file = grab_file(fname, &size);
2444 /* No symbol versions, silently ignore */
2447 while ((line = get_next_line(&pos, file, size))) {
2448 char *symname, *namespace, *modname, *d, *export;
2453 if (!(symname = strchr(line, '\t')))
2456 if (!(modname = strchr(symname, '\t')))
2459 if (!(export = strchr(modname, '\t')))
2462 if (!(namespace = strchr(export, '\t')))
2464 *namespace++ = '\0';
2466 crc = strtoul(line, &d, 16);
2467 if (*symname == '\0' || *modname == '\0' || *d != '\0')
2469 mod = find_module(modname);
2471 if (is_vmlinux(modname))
2473 mod = new_module(modname);
2476 s = sym_add_exported(symname, mod, export_no(export));
2479 sym_set_crc(symname, crc);
2480 sym_update_namespace(symname, namespace);
2482 release_file(file, size);
2485 release_file(file, size);
2486 fatal("parse error in symbol dump file\n");
2489 /* For normal builds always dump all symbols.
2490 * For external modules only dump symbols
2491 * that are not read from kernel Module.symvers.
2493 static int dump_sym(struct symbol *sym)
2495 if (!external_module)
2497 if (sym->vmlinux || sym->kernel)
2502 static void write_dump(const char *fname)
2504 struct buffer buf = { };
2505 struct symbol *symbol;
2506 const char *namespace;
2509 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
2510 symbol = symbolhash[n];
2512 if (dump_sym(symbol)) {
2513 namespace = symbol->namespace;
2514 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\t%s\n",
2515 symbol->crc, symbol->name,
2516 symbol->module->name,
2517 export_str(symbol->export),
2518 namespace ? namespace : "");
2520 symbol = symbol->next;
2523 write_if_changed(&buf, fname);
2527 static void write_namespace_deps_files(const char *fname)
2530 struct namespace_list *ns;
2531 struct buffer ns_deps_buf = {};
2533 for (mod = modules; mod; mod = mod->next) {
2535 if (mod->skip || !mod->missing_namespaces)
2538 buf_printf(&ns_deps_buf, "%s.ko:", mod->name);
2540 for (ns = mod->missing_namespaces; ns; ns = ns->next)
2541 buf_printf(&ns_deps_buf, " %s", ns->namespace);
2543 buf_printf(&ns_deps_buf, "\n");
2546 write_if_changed(&ns_deps_buf, fname);
2547 free(ns_deps_buf.p);
2550 struct ext_sym_list {
2551 struct ext_sym_list *next;
2555 int main(int argc, char **argv)
2558 struct buffer buf = { };
2559 char *kernel_read = NULL;
2560 char *missing_namespace_deps = NULL;
2561 char *dump_write = NULL, *files_source = NULL;
2565 struct ext_sym_list *extsym_iter;
2566 struct ext_sym_list *extsym_start = NULL;
2568 while ((opt = getopt(argc, argv, "i:e:mnsT:o:awEd:")) != -1) {
2571 kernel_read = optarg;
2572 external_module = 1;
2575 external_module = 1;
2577 NOFAIL(malloc(sizeof(*extsym_iter)));
2578 extsym_iter->next = extsym_start;
2579 extsym_iter->file = optarg;
2580 extsym_start = extsym_iter;
2586 ignore_missing_files = 1;
2589 dump_write = optarg;
2595 vmlinux_section_warnings = 0;
2598 files_source = optarg;
2601 warn_unresolved = 1;
2604 sec_mismatch_fatal = 1;
2607 missing_namespace_deps = optarg;
2615 read_dump(kernel_read, 1);
2616 while (extsym_start) {
2617 read_dump(extsym_start->file, 0);
2618 extsym_iter = extsym_start->next;
2620 extsym_start = extsym_iter;
2623 while (optind < argc)
2624 read_symbols(argv[optind++]);
2627 read_symbols_from_files(files_source);
2631 for (mod = modules; mod; mod = mod->next) {
2632 char fname[PATH_MAX];
2639 err |= check_modname_len(mod);
2640 err |= check_exports(mod);
2642 add_header(&buf, mod);
2643 add_intree_flag(&buf, !external_module);
2644 add_retpoline(&buf);
2645 add_staging_flag(&buf, mod->name);
2646 err |= add_versions(&buf, mod);
2647 add_depends(&buf, mod);
2648 add_moddevtable(&buf, mod);
2649 add_srcversion(&buf, mod);
2651 sprintf(fname, "%s.mod.c", mod->name);
2652 write_if_changed(&buf, fname);
2655 if (missing_namespace_deps)
2656 write_namespace_deps_files(missing_namespace_deps);
2659 write_dump(dump_write);
2660 if (sec_mismatch_count && sec_mismatch_fatal)
2661 fatal("modpost: Section mismatches detected.\n"
2662 "Set CONFIG_SECTION_MISMATCH_WARN_ONLY=y to allow them.\n");
2663 for (n = 0; n < SYMBOL_HASH_SIZE; n++) {
2666 for (s = symbolhash[n]; s; s = s->next) {
2668 * Do not check "vmlinux". This avoids the same warnings
2669 * shown twice, and false-positives for ARCH=um.
2671 if (is_vmlinux(s->module->name) && !s->module->is_dot_o)
2675 warn("\"%s\" [%s] is a static %s\n",
2676 s->name, s->module->name,
2677 export_str(s->export));