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 /* Only warn about unresolved symbols */
34 static int warn_unresolved = 0;
35 /* How a symbol is exported */
36 static int sec_mismatch_count = 0;
37 static int sec_mismatch_fatal = 0;
38 /* ignore missing files */
39 static int ignore_missing_files;
40 /* If set to 1, only warn (instead of error) about missing ns imports */
41 static int allow_missing_ns_imports;
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 void __attribute__((format(printf, 2, 3)))
55 modpost_log(enum loglevel loglevel, const char *fmt, ...)
61 fprintf(stderr, "WARNING: ");
64 fprintf(stderr, "ERROR: ");
67 fprintf(stderr, "FATAL: ");
69 default: /* invalid loglevel, ignore */
73 fprintf(stderr, "modpost: ");
75 va_start(arglist, fmt);
76 vfprintf(stderr, fmt, arglist);
79 if (loglevel == LOG_FATAL)
83 static inline bool strends(const char *str, const char *postfix)
85 if (strlen(str) < strlen(postfix))
88 return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
91 void *do_nofail(void *ptr, const char *expr)
94 fatal("Memory allocation failure: %s.\n", expr);
99 char *read_text_file(const char *filename)
106 fd = open(filename, O_RDONLY);
112 if (fstat(fd, &st) < 0) {
117 buf = NOFAIL(malloc(st.st_size + 1));
124 bytes_read = read(fd, buf, nbytes);
125 if (bytes_read < 0) {
130 nbytes -= bytes_read;
132 buf[st.st_size] = '\0';
139 char *get_line(char **stringp)
141 char *orig = *stringp, *next;
143 /* do not return the unwanted extra line at EOF */
144 if (!orig || *orig == '\0')
147 /* don't use strsep here, it is not available everywhere */
148 next = strchr(orig, '\n');
157 /* A list of all modules we processed */
158 static struct module *modules;
160 static struct module *find_module(const char *modname)
164 for (mod = modules; mod; mod = mod->next)
165 if (strcmp(mod->name, modname) == 0)
170 static struct module *new_module(const char *modname)
174 mod = NOFAIL(malloc(sizeof(*mod) + strlen(modname) + 1));
175 memset(mod, 0, sizeof(*mod));
178 strcpy(mod->name, modname);
179 mod->is_vmlinux = (strcmp(modname, "vmlinux") == 0);
180 mod->gpl_compatible = -1;
190 /* A hash of all exported symbols,
191 * struct symbol is also used for lists of unresolved symbols */
193 #define SYMBOL_HASH_SIZE 1024
197 struct module *module;
202 unsigned int is_static:1; /* 1 if symbol is not global */
203 enum export export; /* Type of export */
207 static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
209 /* This is based on the hash agorithm from gdbm, via tdb */
210 static inline unsigned int tdb_hash(const char *name)
212 unsigned value; /* Used to compute the hash value. */
213 unsigned i; /* Used to cycle through random values. */
215 /* Set the initial value from the key size. */
216 for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
217 value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
219 return (1103515243 * value + 12345);
223 * Allocate a new symbols for use in the hash of exported symbols or
224 * the list of unresolved symbols per module
226 static struct symbol *alloc_symbol(const char *name, unsigned int weak,
229 struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
231 memset(s, 0, sizeof(*s));
232 strcpy(s->name, name);
239 /* For the hash of exported symbols */
240 static struct symbol *new_symbol(const char *name, struct module *module,
245 hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
246 symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
248 return symbolhash[hash];
251 static struct symbol *find_symbol(const char *name)
255 /* For our purposes, .foo matches foo. PPC64 needs this. */
259 for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
260 if (strcmp(s->name, name) == 0)
266 static bool contains_namespace(struct namespace_list *list,
267 const char *namespace)
269 for (; list; list = list->next)
270 if (!strcmp(list->namespace, namespace))
276 static void add_namespace(struct namespace_list **list, const char *namespace)
278 struct namespace_list *ns_entry;
280 if (!contains_namespace(*list, namespace)) {
281 ns_entry = NOFAIL(malloc(sizeof(struct namespace_list) +
282 strlen(namespace) + 1));
283 strcpy(ns_entry->namespace, namespace);
284 ns_entry->next = *list;
289 static bool module_imports_namespace(struct module *module,
290 const char *namespace)
292 return contains_namespace(module->imported_namespaces, namespace);
295 static const struct {
299 { .str = "EXPORT_SYMBOL", .export = export_plain },
300 { .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
301 { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
302 { .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
303 { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
304 { .str = "(unknown)", .export = export_unknown },
308 static const char *export_str(enum export ex)
310 return export_list[ex].str;
313 static enum export export_no(const char *s)
318 return export_unknown;
319 for (i = 0; export_list[i].export != export_unknown; i++) {
320 if (strcmp(export_list[i].str, s) == 0)
321 return export_list[i].export;
323 return export_unknown;
326 static void *sym_get_data_by_offset(const struct elf_info *info,
327 unsigned int secindex, unsigned long offset)
329 Elf_Shdr *sechdr = &info->sechdrs[secindex];
331 if (info->hdr->e_type != ET_REL)
332 offset -= sechdr->sh_addr;
334 return (void *)info->hdr + sechdr->sh_offset + offset;
337 static void *sym_get_data(const struct elf_info *info, const Elf_Sym *sym)
339 return sym_get_data_by_offset(info, get_secindex(info, sym),
343 static const char *sech_name(const struct elf_info *info, Elf_Shdr *sechdr)
345 return sym_get_data_by_offset(info, info->secindex_strings,
349 static const char *sec_name(const struct elf_info *info, int secindex)
351 return sech_name(info, &info->sechdrs[secindex]);
354 #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
356 static enum export export_from_secname(struct elf_info *elf, unsigned int sec)
358 const char *secname = sec_name(elf, sec);
360 if (strstarts(secname, "___ksymtab+"))
362 else if (strstarts(secname, "___ksymtab_unused+"))
363 return export_unused;
364 else if (strstarts(secname, "___ksymtab_gpl+"))
366 else if (strstarts(secname, "___ksymtab_unused_gpl+"))
367 return export_unused_gpl;
368 else if (strstarts(secname, "___ksymtab_gpl_future+"))
369 return export_gpl_future;
371 return export_unknown;
374 static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
376 if (sec == elf->export_sec)
378 else if (sec == elf->export_unused_sec)
379 return export_unused;
380 else if (sec == elf->export_gpl_sec)
382 else if (sec == elf->export_unused_gpl_sec)
383 return export_unused_gpl;
384 else if (sec == elf->export_gpl_future_sec)
385 return export_gpl_future;
387 return export_unknown;
390 static const char *namespace_from_kstrtabns(const struct elf_info *info,
393 const char *value = sym_get_data(info, sym);
394 return value[0] ? value : NULL;
397 static void sym_update_namespace(const char *symname, const char *namespace)
399 struct symbol *s = find_symbol(symname);
402 * That symbol should have been created earlier and thus this is
403 * actually an assertion.
406 merror("Could not update namespace(%s) for symbol %s\n",
413 namespace && namespace[0] ? NOFAIL(strdup(namespace)) : NULL;
417 * Add an exported symbol - it may have already been added without a
418 * CRC, in this case just update the CRC
420 static struct symbol *sym_add_exported(const char *name, struct module *mod,
423 struct symbol *s = find_symbol(name);
426 s = new_symbol(name, mod, export);
427 } else if (!external_module || s->module->is_vmlinux ||
429 warn("%s: '%s' exported twice. Previous export was in %s%s\n",
430 mod->name, name, s->module->name,
431 s->module->is_vmlinux ? "" : ".ko");
440 static void sym_set_crc(const char *name, unsigned int crc)
442 struct symbol *s = find_symbol(name);
445 * Ignore stand-alone __crc_*, which might be auto-generated symbols
446 * such as __*_veneer in ARM ELF.
455 static void *grab_file(const char *filename, size_t *size)
458 void *map = MAP_FAILED;
461 fd = open(filename, O_RDONLY);
468 map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
472 if (map == MAP_FAILED)
477 static void release_file(void *file, size_t size)
482 static int parse_elf(struct elf_info *info, const char *filename)
488 const char *secstrings;
489 unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;
491 hdr = grab_file(filename, &info->size);
493 if (ignore_missing_files) {
494 fprintf(stderr, "%s: %s (ignored)\n", filename,
502 if (info->size < sizeof(*hdr)) {
503 /* file too small, assume this is an empty .o file */
506 /* Is this a valid ELF file? */
507 if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
508 (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
509 (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
510 (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
511 /* Not an ELF file - silently ignore it */
514 /* Fix endianness in ELF header */
515 hdr->e_type = TO_NATIVE(hdr->e_type);
516 hdr->e_machine = TO_NATIVE(hdr->e_machine);
517 hdr->e_version = TO_NATIVE(hdr->e_version);
518 hdr->e_entry = TO_NATIVE(hdr->e_entry);
519 hdr->e_phoff = TO_NATIVE(hdr->e_phoff);
520 hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
521 hdr->e_flags = TO_NATIVE(hdr->e_flags);
522 hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize);
523 hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize);
524 hdr->e_phnum = TO_NATIVE(hdr->e_phnum);
525 hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize);
526 hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
527 hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
528 sechdrs = (void *)hdr + hdr->e_shoff;
529 info->sechdrs = sechdrs;
531 /* Check if file offset is correct */
532 if (hdr->e_shoff > info->size) {
533 fatal("section header offset=%lu in file '%s' is bigger than filesize=%zu\n",
534 (unsigned long)hdr->e_shoff, filename, info->size);
538 if (hdr->e_shnum == SHN_UNDEF) {
540 * There are more than 64k sections,
541 * read count from .sh_size.
543 info->num_sections = TO_NATIVE(sechdrs[0].sh_size);
546 info->num_sections = hdr->e_shnum;
548 if (hdr->e_shstrndx == SHN_XINDEX) {
549 info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link);
552 info->secindex_strings = hdr->e_shstrndx;
555 /* Fix endianness in section headers */
556 for (i = 0; i < info->num_sections; i++) {
557 sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
558 sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
559 sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags);
560 sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
561 sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
562 sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
563 sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
564 sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
565 sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign);
566 sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize);
568 /* Find symbol table. */
569 secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset;
570 for (i = 1; i < info->num_sections; i++) {
572 int nobits = sechdrs[i].sh_type == SHT_NOBITS;
574 if (!nobits && sechdrs[i].sh_offset > info->size) {
575 fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
576 "sizeof(*hrd)=%zu\n", filename,
577 (unsigned long)sechdrs[i].sh_offset,
581 secname = secstrings + sechdrs[i].sh_name;
582 if (strcmp(secname, ".modinfo") == 0) {
584 fatal("%s has NOBITS .modinfo\n", filename);
585 info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
586 info->modinfo_len = sechdrs[i].sh_size;
587 } else if (strcmp(secname, "__ksymtab") == 0)
588 info->export_sec = i;
589 else if (strcmp(secname, "__ksymtab_unused") == 0)
590 info->export_unused_sec = i;
591 else if (strcmp(secname, "__ksymtab_gpl") == 0)
592 info->export_gpl_sec = i;
593 else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
594 info->export_unused_gpl_sec = i;
595 else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
596 info->export_gpl_future_sec = i;
598 if (sechdrs[i].sh_type == SHT_SYMTAB) {
599 unsigned int sh_link_idx;
601 info->symtab_start = (void *)hdr +
602 sechdrs[i].sh_offset;
603 info->symtab_stop = (void *)hdr +
604 sechdrs[i].sh_offset + sechdrs[i].sh_size;
605 sh_link_idx = sechdrs[i].sh_link;
606 info->strtab = (void *)hdr +
607 sechdrs[sh_link_idx].sh_offset;
610 /* 32bit section no. table? ("more than 64k sections") */
611 if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
612 symtab_shndx_idx = i;
613 info->symtab_shndx_start = (void *)hdr +
614 sechdrs[i].sh_offset;
615 info->symtab_shndx_stop = (void *)hdr +
616 sechdrs[i].sh_offset + sechdrs[i].sh_size;
619 if (!info->symtab_start)
620 fatal("%s has no symtab?\n", filename);
622 /* Fix endianness in symbols */
623 for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
624 sym->st_shndx = TO_NATIVE(sym->st_shndx);
625 sym->st_name = TO_NATIVE(sym->st_name);
626 sym->st_value = TO_NATIVE(sym->st_value);
627 sym->st_size = TO_NATIVE(sym->st_size);
630 if (symtab_shndx_idx != ~0U) {
632 if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link)
633 fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
634 filename, sechdrs[symtab_shndx_idx].sh_link,
637 for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
645 static void parse_elf_finish(struct elf_info *info)
647 release_file(info->hdr, info->size);
650 static int ignore_undef_symbol(struct elf_info *info, const char *symname)
652 /* ignore __this_module, it will be resolved shortly */
653 if (strcmp(symname, "__this_module") == 0)
655 /* ignore global offset table */
656 if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
658 if (info->hdr->e_machine == EM_PPC)
659 /* Special register function linked on all modules during final link of .ko */
660 if (strstarts(symname, "_restgpr_") ||
661 strstarts(symname, "_savegpr_") ||
662 strstarts(symname, "_rest32gpr_") ||
663 strstarts(symname, "_save32gpr_") ||
664 strstarts(symname, "_restvr_") ||
665 strstarts(symname, "_savevr_"))
667 if (info->hdr->e_machine == EM_PPC64)
668 /* Special register function linked on all modules during final link of .ko */
669 if (strstarts(symname, "_restgpr0_") ||
670 strstarts(symname, "_savegpr0_") ||
671 strstarts(symname, "_restvr_") ||
672 strstarts(symname, "_savevr_") ||
673 strcmp(symname, ".TOC.") == 0)
675 /* Do not ignore this symbol */
679 static void handle_modversion(const struct module *mod,
680 const struct elf_info *info,
681 const Elf_Sym *sym, const char *symname)
685 if (sym->st_shndx == SHN_UNDEF) {
686 warn("EXPORT symbol \"%s\" [%s%s] version generation failed, symbol will not be versioned.\n",
687 symname, mod->name, mod->is_vmlinux ? "" : ".ko");
691 if (sym->st_shndx == SHN_ABS) {
696 /* symbol points to the CRC in the ELF object */
697 crcp = sym_get_data(info, sym);
698 crc = TO_NATIVE(*crcp);
700 sym_set_crc(symname, crc);
703 static void handle_symbol(struct module *mod, struct elf_info *info,
704 const Elf_Sym *sym, const char *symname)
709 if (strstarts(symname, "__ksymtab"))
710 export = export_from_secname(info, get_secindex(info, sym));
712 export = export_from_sec(info, get_secindex(info, sym));
714 switch (sym->st_shndx) {
716 if (strstarts(symname, "__gnu_lto_")) {
717 /* Should warn here, but modpost runs before the linker */
719 warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
722 /* undefined symbol */
723 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
724 ELF_ST_BIND(sym->st_info) != STB_WEAK)
726 if (ignore_undef_symbol(info, symname))
728 if (info->hdr->e_machine == EM_SPARC ||
729 info->hdr->e_machine == EM_SPARCV9) {
730 /* Ignore register directives. */
731 if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
733 if (symname[0] == '.') {
734 char *munged = NOFAIL(strdup(symname));
736 munged[1] = toupper(munged[1]);
741 mod->unres = alloc_symbol(symname,
742 ELF_ST_BIND(sym->st_info) == STB_WEAK,
746 /* All exported symbols */
747 if (strstarts(symname, "__ksymtab_")) {
748 name = symname + strlen("__ksymtab_");
749 sym_add_exported(name, mod, export);
751 if (strcmp(symname, "init_module") == 0)
753 if (strcmp(symname, "cleanup_module") == 0)
754 mod->has_cleanup = 1;
760 * Parse tag=value strings from .modinfo section
762 static char *next_string(char *string, unsigned long *secsize)
764 /* Skip non-zero chars */
767 if ((*secsize)-- <= 1)
771 /* Skip any zero padding. */
774 if ((*secsize)-- <= 1)
780 static char *get_next_modinfo(struct elf_info *info, const char *tag,
784 unsigned int taglen = strlen(tag);
785 char *modinfo = info->modinfo;
786 unsigned long size = info->modinfo_len;
789 size -= prev - modinfo;
790 modinfo = next_string(prev, &size);
793 for (p = modinfo; p; p = next_string(p, &size)) {
794 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
795 return p + taglen + 1;
800 static char *get_modinfo(struct elf_info *info, const char *tag)
803 return get_next_modinfo(info, tag, NULL);
807 * Test if string s ends in string sub
810 static int strrcmp(const char *s, const char *sub)
818 sublen = strlen(sub);
820 if ((slen == 0) || (sublen == 0))
826 return memcmp(s + slen - sublen, sub, sublen);
829 static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
832 return elf->strtab + sym->st_name;
837 /* The pattern is an array of simple patterns.
838 * "foo" will match an exact string equal to "foo"
839 * "*foo" will match a string that ends with "foo"
840 * "foo*" will match a string that begins with "foo"
841 * "*foo*" will match a string that contains "foo"
843 static int match(const char *sym, const char * const pat[])
848 const char *endp = p + strlen(p) - 1;
851 if (*p == '*' && *endp == '*') {
852 char *bare = NOFAIL(strndup(p + 1, strlen(p) - 2));
853 char *here = strstr(sym, bare);
860 else if (*p == '*') {
861 if (strrcmp(sym, p + 1) == 0)
865 else if (*endp == '*') {
866 if (strncmp(sym, p, strlen(p) - 1) == 0)
871 if (strcmp(p, sym) == 0)
879 /* sections that we do not want to do full section mismatch check on */
880 static const char *const section_white_list[] =
884 ".cranges", /* sh64 */
885 ".zdebug*", /* Compressed debug sections. */
886 ".GCC.command.line", /* record-gcc-switches */
887 ".mdebug*", /* alpha, score, mips etc. */
888 ".pdr", /* alpha, score, mips etc. */
893 ".xt.prop", /* xtensa */
894 ".xt.lit", /* xtensa */
895 ".arcextmap*", /* arc */
896 ".gnu.linkonce.arcext*", /* arc : modules */
897 ".cmem*", /* EZchip */
898 ".fmt_slot*", /* EZchip */
905 * This is used to find sections missing the SHF_ALLOC flag.
906 * The cause of this is often a section specified in assembler
907 * without "ax" / "aw".
909 static void check_section(const char *modname, struct elf_info *elf,
912 const char *sec = sech_name(elf, sechdr);
914 if (sechdr->sh_type == SHT_PROGBITS &&
915 !(sechdr->sh_flags & SHF_ALLOC) &&
916 !match(sec, section_white_list)) {
917 warn("%s (%s): unexpected non-allocatable section.\n"
918 "Did you forget to use \"ax\"/\"aw\" in a .S file?\n"
919 "Note that for example <linux/init.h> contains\n"
920 "section definitions for use in .S files.\n\n",
927 #define ALL_INIT_DATA_SECTIONS \
928 ".init.setup", ".init.rodata", ".meminit.rodata", \
929 ".init.data", ".meminit.data"
930 #define ALL_EXIT_DATA_SECTIONS \
931 ".exit.data", ".memexit.data"
933 #define ALL_INIT_TEXT_SECTIONS \
934 ".init.text", ".meminit.text"
935 #define ALL_EXIT_TEXT_SECTIONS \
936 ".exit.text", ".memexit.text"
938 #define ALL_PCI_INIT_SECTIONS \
939 ".pci_fixup_early", ".pci_fixup_header", ".pci_fixup_final", \
940 ".pci_fixup_enable", ".pci_fixup_resume", \
941 ".pci_fixup_resume_early", ".pci_fixup_suspend"
943 #define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS
944 #define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS
946 #define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
947 #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
949 #define DATA_SECTIONS ".data", ".data.rel"
950 #define TEXT_SECTIONS ".text", ".text.unlikely", ".sched.text", \
951 ".kprobes.text", ".cpuidle.text", ".noinstr.text"
952 #define OTHER_TEXT_SECTIONS ".ref.text", ".head.text", ".spinlock.text", \
953 ".fixup", ".entry.text", ".exception.text", ".text.*", \
956 #define INIT_SECTIONS ".init.*"
957 #define MEM_INIT_SECTIONS ".meminit.*"
959 #define EXIT_SECTIONS ".exit.*"
960 #define MEM_EXIT_SECTIONS ".memexit.*"
962 #define ALL_TEXT_SECTIONS ALL_INIT_TEXT_SECTIONS, ALL_EXIT_TEXT_SECTIONS, \
963 TEXT_SECTIONS, OTHER_TEXT_SECTIONS
965 /* init data sections */
966 static const char *const init_data_sections[] =
967 { ALL_INIT_DATA_SECTIONS, NULL };
969 /* all init sections */
970 static const char *const init_sections[] = { ALL_INIT_SECTIONS, NULL };
972 /* All init and exit sections (code + data) */
973 static const char *const init_exit_sections[] =
974 {ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };
976 /* all text sections */
977 static const char *const text_sections[] = { ALL_TEXT_SECTIONS, NULL };
980 static const char *const data_sections[] = { DATA_SECTIONS, NULL };
983 /* symbols in .data that may refer to init/exit sections */
984 #define DEFAULT_SYMBOL_WHITE_LIST \
986 "*_template", /* scsi uses *_template a lot */ \
987 "*_timer", /* arm uses ops structures named _timer a lot */ \
988 "*_sht", /* scsi also used *_sht to some extent */ \
994 static const char *const head_sections[] = { ".head.text*", NULL };
995 static const char *const linker_symbols[] =
996 { "__init_begin", "_sinittext", "_einittext", NULL };
997 static const char *const optim_symbols[] = { "*.constprop.*", NULL };
1004 XXXINIT_TO_SOME_INIT,
1005 XXXEXIT_TO_SOME_EXIT,
1006 ANY_INIT_TO_ANY_EXIT,
1007 ANY_EXIT_TO_ANY_INIT,
1008 EXPORT_TO_INIT_EXIT,
1009 EXTABLE_TO_NON_TEXT,
1013 * Describe how to match sections on different criterias:
1015 * @fromsec: Array of sections to be matched.
1017 * @bad_tosec: Relocations applied to a section in @fromsec to a section in
1018 * this array is forbidden (black-list). Can be empty.
1020 * @good_tosec: Relocations applied to a section in @fromsec must be
1021 * targetting sections in this array (white-list). Can be empty.
1023 * @mismatch: Type of mismatch.
1025 * @symbol_white_list: Do not match a relocation to a symbol in this list
1026 * even if it is targetting a section in @bad_to_sec.
1028 * @handler: Specific handler to call when a match is found. If NULL,
1029 * default_mismatch_handler() will be called.
1032 struct sectioncheck {
1033 const char *fromsec[20];
1034 const char *bad_tosec[20];
1035 const char *good_tosec[20];
1036 enum mismatch mismatch;
1037 const char *symbol_white_list[20];
1038 void (*handler)(const char *modname, struct elf_info *elf,
1039 const struct sectioncheck* const mismatch,
1040 Elf_Rela *r, Elf_Sym *sym, const char *fromsec);
1044 static void extable_mismatch_handler(const char *modname, struct elf_info *elf,
1045 const struct sectioncheck* const mismatch,
1046 Elf_Rela *r, Elf_Sym *sym,
1047 const char *fromsec);
1049 static const struct sectioncheck sectioncheck[] = {
1050 /* Do not reference init/exit code/data from
1051 * normal code and data
1054 .fromsec = { TEXT_SECTIONS, NULL },
1055 .bad_tosec = { ALL_INIT_SECTIONS, NULL },
1056 .mismatch = TEXT_TO_ANY_INIT,
1057 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1060 .fromsec = { DATA_SECTIONS, NULL },
1061 .bad_tosec = { ALL_XXXINIT_SECTIONS, NULL },
1062 .mismatch = DATA_TO_ANY_INIT,
1063 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1066 .fromsec = { DATA_SECTIONS, NULL },
1067 .bad_tosec = { INIT_SECTIONS, NULL },
1068 .mismatch = DATA_TO_ANY_INIT,
1069 .symbol_white_list = {
1070 "*_template", "*_timer", "*_sht", "*_ops",
1071 "*_probe", "*_probe_one", "*_console", NULL
1075 .fromsec = { TEXT_SECTIONS, NULL },
1076 .bad_tosec = { ALL_EXIT_SECTIONS, NULL },
1077 .mismatch = TEXT_TO_ANY_EXIT,
1078 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1081 .fromsec = { DATA_SECTIONS, NULL },
1082 .bad_tosec = { ALL_EXIT_SECTIONS, NULL },
1083 .mismatch = DATA_TO_ANY_EXIT,
1084 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1086 /* Do not reference init code/data from meminit code/data */
1088 .fromsec = { ALL_XXXINIT_SECTIONS, NULL },
1089 .bad_tosec = { INIT_SECTIONS, NULL },
1090 .mismatch = XXXINIT_TO_SOME_INIT,
1091 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1093 /* Do not reference exit code/data from memexit code/data */
1095 .fromsec = { ALL_XXXEXIT_SECTIONS, NULL },
1096 .bad_tosec = { EXIT_SECTIONS, NULL },
1097 .mismatch = XXXEXIT_TO_SOME_EXIT,
1098 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1100 /* Do not use exit code/data from init code */
1102 .fromsec = { ALL_INIT_SECTIONS, NULL },
1103 .bad_tosec = { ALL_EXIT_SECTIONS, NULL },
1104 .mismatch = ANY_INIT_TO_ANY_EXIT,
1105 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1107 /* Do not use init code/data from exit code */
1109 .fromsec = { ALL_EXIT_SECTIONS, NULL },
1110 .bad_tosec = { ALL_INIT_SECTIONS, NULL },
1111 .mismatch = ANY_EXIT_TO_ANY_INIT,
1112 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1115 .fromsec = { ALL_PCI_INIT_SECTIONS, NULL },
1116 .bad_tosec = { INIT_SECTIONS, NULL },
1117 .mismatch = ANY_INIT_TO_ANY_EXIT,
1118 .symbol_white_list = { NULL },
1120 /* Do not export init/exit functions or data */
1122 .fromsec = { "__ksymtab*", NULL },
1123 .bad_tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
1124 .mismatch = EXPORT_TO_INIT_EXIT,
1125 .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
1128 .fromsec = { "__ex_table", NULL },
1129 /* If you're adding any new black-listed sections in here, consider
1130 * adding a special 'printer' for them in scripts/check_extable.
1132 .bad_tosec = { ".altinstr_replacement", NULL },
1133 .good_tosec = {ALL_TEXT_SECTIONS , NULL},
1134 .mismatch = EXTABLE_TO_NON_TEXT,
1135 .handler = extable_mismatch_handler,
1139 static const struct sectioncheck *section_mismatch(
1140 const char *fromsec, const char *tosec)
1143 int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
1144 const struct sectioncheck *check = §ioncheck[0];
1147 * The target section could be the SHT_NUL section when we're
1148 * handling relocations to un-resolved symbols, trying to match it
1149 * doesn't make much sense and causes build failures on parisc
1155 for (i = 0; i < elems; i++) {
1156 if (match(fromsec, check->fromsec)) {
1157 if (check->bad_tosec[0] && match(tosec, check->bad_tosec))
1159 if (check->good_tosec[0] && !match(tosec, check->good_tosec))
1168 * Whitelist to allow certain references to pass with no warning.
1171 * If a module parameter is declared __initdata and permissions=0
1172 * then this is legal despite the warning generated.
1173 * We cannot see value of permissions here, so just ignore
1175 * The pattern is identified by:
1176 * tosec = .init.data
1181 * module_param_call() ops can refer to __init set function if permissions=0
1182 * The pattern is identified by:
1183 * tosec = .init.text
1185 * atsym = __param_ops_*
1188 * Many drivers utilise a *driver container with references to
1189 * add, remove, probe functions etc.
1190 * the pattern is identified by:
1191 * tosec = init or exit section
1192 * fromsec = data section
1193 * atsym = *driver, *_template, *_sht, *_ops, *_probe,
1194 * *probe_one, *_console, *_timer
1197 * Whitelist all references from .head.text to any init section
1200 * Some symbols belong to init section but still it is ok to reference
1201 * these from non-init sections as these symbols don't have any memory
1202 * allocated for them and symbol address and value are same. So even
1203 * if init section is freed, its ok to reference those symbols.
1204 * For ex. symbols marking the init section boundaries.
1205 * This pattern is identified by
1206 * refsymname = __init_begin, _sinittext, _einittext
1209 * GCC may optimize static inlines when fed constant arg(s) resulting
1210 * in functions like cpumask_empty() -- generating an associated symbol
1211 * cpumask_empty.constprop.3 that appears in the audit. If the const that
1212 * is passed in comes from __init, like say nmi_ipi_mask, we get a
1213 * meaningless section warning. May need to add isra symbols too...
1214 * This pattern is identified by
1215 * tosec = init section
1216 * fromsec = text section
1217 * refsymname = *.constprop.*
1220 * Hide section mismatch warnings for ELF local symbols. The goal
1221 * is to eliminate false positive modpost warnings caused by
1222 * compiler-generated ELF local symbol names such as ".LANCHOR1".
1223 * Autogenerated symbol names bypass modpost's "Pattern 2"
1224 * whitelisting, which relies on pattern-matching against symbol
1225 * names to work. (One situation where gcc can autogenerate ELF
1226 * local symbols is when "-fsection-anchors" is used.)
1228 static int secref_whitelist(const struct sectioncheck *mismatch,
1229 const char *fromsec, const char *fromsym,
1230 const char *tosec, const char *tosym)
1232 /* Check for pattern 1 */
1233 if (match(tosec, init_data_sections) &&
1234 match(fromsec, data_sections) &&
1235 strstarts(fromsym, "__param"))
1238 /* Check for pattern 1a */
1239 if (strcmp(tosec, ".init.text") == 0 &&
1240 match(fromsec, data_sections) &&
1241 strstarts(fromsym, "__param_ops_"))
1244 /* Check for pattern 2 */
1245 if (match(tosec, init_exit_sections) &&
1246 match(fromsec, data_sections) &&
1247 match(fromsym, mismatch->symbol_white_list))
1250 /* Check for pattern 3 */
1251 if (match(fromsec, head_sections) &&
1252 match(tosec, init_sections))
1255 /* Check for pattern 4 */
1256 if (match(tosym, linker_symbols))
1259 /* Check for pattern 5 */
1260 if (match(fromsec, text_sections) &&
1261 match(tosec, init_sections) &&
1262 match(fromsym, optim_symbols))
1265 /* Check for pattern 6 */
1266 if (strstarts(fromsym, ".L"))
1272 static inline int is_arm_mapping_symbol(const char *str)
1274 return str[0] == '$' && strchr("axtd", str[1])
1275 && (str[2] == '\0' || str[2] == '.');
1279 * If there's no name there, ignore it; likewise, ignore it if it's
1280 * one of the magic symbols emitted used by current ARM tools.
1282 * Otherwise if find_symbols_between() returns those symbols, they'll
1283 * fail the whitelist tests and cause lots of false alarms ... fixable
1284 * only by merging __exit and __init sections into __text, bloating
1285 * the kernel (which is especially evil on embedded platforms).
1287 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
1289 const char *name = elf->strtab + sym->st_name;
1291 if (!name || !strlen(name))
1293 return !is_arm_mapping_symbol(name);
1297 * Find symbol based on relocation record info.
1298 * In some cases the symbol supplied is a valid symbol so
1299 * return refsym. If st_name != 0 we assume this is a valid symbol.
1300 * In other cases the symbol needs to be looked up in the symbol table
1301 * based on section and address.
1303 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
1307 Elf_Sym *near = NULL;
1308 Elf64_Sword distance = 20;
1310 unsigned int relsym_secindex;
1312 if (relsym->st_name != 0)
1315 relsym_secindex = get_secindex(elf, relsym);
1316 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1317 if (get_secindex(elf, sym) != relsym_secindex)
1319 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
1321 if (!is_valid_name(elf, sym))
1323 if (sym->st_value == addr)
1325 /* Find a symbol nearby - addr are maybe negative */
1326 d = sym->st_value - addr;
1328 d = addr - sym->st_value;
1334 /* We need a close match */
1342 * Find symbols before or equal addr and after addr - in the section sec.
1343 * If we find two symbols with equal offset prefer one with a valid name.
1344 * The ELF format may have a better way to detect what type of symbol
1345 * it is, but this works for now.
1347 static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
1351 Elf_Sym *near = NULL;
1352 Elf_Addr distance = ~0;
1354 for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
1357 if (is_shndx_special(sym->st_shndx))
1359 symsec = sec_name(elf, get_secindex(elf, sym));
1360 if (strcmp(symsec, sec) != 0)
1362 if (!is_valid_name(elf, sym))
1364 if (sym->st_value <= addr) {
1365 if ((addr - sym->st_value) < distance) {
1366 distance = addr - sym->st_value;
1368 } else if ((addr - sym->st_value) == distance) {
1377 * Convert a section name to the function/data attribute
1378 * .init.text => __init
1379 * .memexitconst => __memconst
1382 * The memory of returned value has been allocated on a heap. The user of this
1383 * method should free it after usage.
1385 static char *sec2annotation(const char *s)
1387 if (match(s, init_exit_sections)) {
1388 char *p = NOFAIL(malloc(20));
1395 while (*s && *s != '.')
1400 if (strstr(s, "rodata") != NULL)
1401 strcat(p, "const ");
1402 else if (strstr(s, "data") != NULL)
1408 return NOFAIL(strdup(""));
1412 static int is_function(Elf_Sym *sym)
1415 return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
1420 static void print_section_list(const char * const list[20])
1422 const char *const *s = list;
1425 fprintf(stderr, "%s", *s);
1428 fprintf(stderr, ", ");
1430 fprintf(stderr, "\n");
1433 static inline void get_pretty_name(int is_func, const char** name, const char** name_p)
1436 case 0: *name = "variable"; *name_p = ""; break;
1437 case 1: *name = "function"; *name_p = "()"; break;
1438 default: *name = "(unknown reference)"; *name_p = ""; break;
1443 * Print a warning about a section mismatch.
1444 * Try to find symbols near it so user can find it.
1445 * Check whitelist before warning - it may be a false positive.
1447 static void report_sec_mismatch(const char *modname,
1448 const struct sectioncheck *mismatch,
1449 const char *fromsec,
1450 unsigned long long fromaddr,
1451 const char *fromsym,
1453 const char *tosec, const char *tosym,
1456 const char *from, *from_p;
1457 const char *to, *to_p;
1461 sec_mismatch_count++;
1463 get_pretty_name(from_is_func, &from, &from_p);
1464 get_pretty_name(to_is_func, &to, &to_p);
1466 warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s "
1467 "to the %s %s:%s%s\n",
1468 modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec,
1471 switch (mismatch->mismatch) {
1472 case TEXT_TO_ANY_INIT:
1473 prl_from = sec2annotation(fromsec);
1474 prl_to = sec2annotation(tosec);
1476 "The function %s%s() references\n"
1478 "This is often because %s lacks a %s\n"
1479 "annotation or the annotation of %s is wrong.\n",
1481 to, prl_to, tosym, to_p,
1482 fromsym, prl_to, tosym);
1486 case DATA_TO_ANY_INIT: {
1487 prl_to = sec2annotation(tosec);
1489 "The variable %s references\n"
1491 "If the reference is valid then annotate the\n"
1492 "variable with __init* or __refdata (see linux/init.h) "
1493 "or name the variable:\n",
1494 fromsym, to, prl_to, tosym, to_p);
1495 print_section_list(mismatch->symbol_white_list);
1499 case TEXT_TO_ANY_EXIT:
1500 prl_to = sec2annotation(tosec);
1502 "The function %s() references a %s in an exit section.\n"
1503 "Often the %s %s%s has valid usage outside the exit section\n"
1504 "and the fix is to remove the %sannotation of %s.\n",
1505 fromsym, to, to, tosym, to_p, prl_to, tosym);
1508 case DATA_TO_ANY_EXIT: {
1509 prl_to = sec2annotation(tosec);
1511 "The variable %s references\n"
1513 "If the reference is valid then annotate the\n"
1514 "variable with __exit* (see linux/init.h) or "
1515 "name the variable:\n",
1516 fromsym, to, prl_to, tosym, to_p);
1517 print_section_list(mismatch->symbol_white_list);
1521 case XXXINIT_TO_SOME_INIT:
1522 case XXXEXIT_TO_SOME_EXIT:
1523 prl_from = sec2annotation(fromsec);
1524 prl_to = sec2annotation(tosec);
1526 "The %s %s%s%s references\n"
1528 "If %s is only used by %s then\n"
1529 "annotate %s with a matching annotation.\n",
1530 from, prl_from, fromsym, from_p,
1531 to, prl_to, tosym, to_p,
1532 tosym, fromsym, tosym);
1536 case ANY_INIT_TO_ANY_EXIT:
1537 prl_from = sec2annotation(fromsec);
1538 prl_to = sec2annotation(tosec);
1540 "The %s %s%s%s references\n"
1542 "This is often seen when error handling "
1543 "in the init function\n"
1544 "uses functionality in the exit path.\n"
1545 "The fix is often to remove the %sannotation of\n"
1546 "%s%s so it may be used outside an exit section.\n",
1547 from, prl_from, fromsym, from_p,
1548 to, prl_to, tosym, to_p,
1549 prl_to, tosym, to_p);
1553 case ANY_EXIT_TO_ANY_INIT:
1554 prl_from = sec2annotation(fromsec);
1555 prl_to = sec2annotation(tosec);
1557 "The %s %s%s%s references\n"
1559 "This is often seen when error handling "
1560 "in the exit function\n"
1561 "uses functionality in the init path.\n"
1562 "The fix is often to remove the %sannotation of\n"
1563 "%s%s so it may be used outside an init section.\n",
1564 from, prl_from, fromsym, from_p,
1565 to, prl_to, tosym, to_p,
1566 prl_to, tosym, to_p);
1570 case EXPORT_TO_INIT_EXIT:
1571 prl_to = sec2annotation(tosec);
1573 "The symbol %s is exported and annotated %s\n"
1574 "Fix this by removing the %sannotation of %s "
1575 "or drop the export.\n",
1576 tosym, prl_to, prl_to, tosym);
1579 case EXTABLE_TO_NON_TEXT:
1580 fatal("There's a special handler for this mismatch type, "
1581 "we should never get here.");
1584 fprintf(stderr, "\n");
1587 static void default_mismatch_handler(const char *modname, struct elf_info *elf,
1588 const struct sectioncheck* const mismatch,
1589 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1595 const char *fromsym;
1597 from = find_elf_symbol2(elf, r->r_offset, fromsec);
1598 fromsym = sym_name(elf, from);
1600 if (strstarts(fromsym, "reference___initcall"))
1603 tosec = sec_name(elf, get_secindex(elf, sym));
1604 to = find_elf_symbol(elf, r->r_addend, sym);
1605 tosym = sym_name(elf, to);
1607 /* check whitelist - we may ignore it */
1608 if (secref_whitelist(mismatch,
1609 fromsec, fromsym, tosec, tosym)) {
1610 report_sec_mismatch(modname, mismatch,
1611 fromsec, r->r_offset, fromsym,
1612 is_function(from), tosec, tosym,
1617 static int is_executable_section(struct elf_info* elf, unsigned int section_index)
1619 if (section_index > elf->num_sections)
1620 fatal("section_index is outside elf->num_sections!\n");
1622 return ((elf->sechdrs[section_index].sh_flags & SHF_EXECINSTR) == SHF_EXECINSTR);
1626 * We rely on a gross hack in section_rel[a]() calling find_extable_entry_size()
1627 * to know the sizeof(struct exception_table_entry) for the target architecture.
1629 static unsigned int extable_entry_size = 0;
1630 static void find_extable_entry_size(const char* const sec, const Elf_Rela* r)
1633 * If we're currently checking the second relocation within __ex_table,
1634 * that relocation offset tells us the offsetof(struct
1635 * exception_table_entry, fixup) which is equal to sizeof(struct
1636 * exception_table_entry) divided by two. We use that to our advantage
1637 * since there's no portable way to get that size as every architecture
1638 * seems to go with different sized types. Not pretty but better than
1639 * hard-coding the size for every architecture..
1641 if (!extable_entry_size)
1642 extable_entry_size = r->r_offset * 2;
1645 static inline bool is_extable_fault_address(Elf_Rela *r)
1648 * extable_entry_size is only discovered after we've handled the
1649 * _second_ relocation in __ex_table, so only abort when we're not
1650 * handling the first reloc and extable_entry_size is zero.
1652 if (r->r_offset && extable_entry_size == 0)
1653 fatal("extable_entry size hasn't been discovered!\n");
1655 return ((r->r_offset == 0) ||
1656 (r->r_offset % extable_entry_size == 0));
1659 #define is_second_extable_reloc(Start, Cur, Sec) \
1660 (((Cur) == (Start) + 1) && (strcmp("__ex_table", (Sec)) == 0))
1662 static void report_extable_warnings(const char* modname, struct elf_info* elf,
1663 const struct sectioncheck* const mismatch,
1664 Elf_Rela* r, Elf_Sym* sym,
1665 const char* fromsec, const char* tosec)
1667 Elf_Sym* fromsym = find_elf_symbol2(elf, r->r_offset, fromsec);
1668 const char* fromsym_name = sym_name(elf, fromsym);
1669 Elf_Sym* tosym = find_elf_symbol(elf, r->r_addend, sym);
1670 const char* tosym_name = sym_name(elf, tosym);
1671 const char* from_pretty_name;
1672 const char* from_pretty_name_p;
1673 const char* to_pretty_name;
1674 const char* to_pretty_name_p;
1676 get_pretty_name(is_function(fromsym),
1677 &from_pretty_name, &from_pretty_name_p);
1678 get_pretty_name(is_function(tosym),
1679 &to_pretty_name, &to_pretty_name_p);
1681 warn("%s(%s+0x%lx): Section mismatch in reference"
1682 " from the %s %s%s to the %s %s:%s%s\n",
1683 modname, fromsec, (long)r->r_offset, from_pretty_name,
1684 fromsym_name, from_pretty_name_p,
1685 to_pretty_name, tosec, tosym_name, to_pretty_name_p);
1687 if (!match(tosec, mismatch->bad_tosec) &&
1688 is_executable_section(elf, get_secindex(elf, sym)))
1690 "The relocation at %s+0x%lx references\n"
1691 "section \"%s\" which is not in the list of\n"
1692 "authorized sections. If you're adding a new section\n"
1693 "and/or if this reference is valid, add \"%s\" to the\n"
1694 "list of authorized sections to jump to on fault.\n"
1695 "This can be achieved by adding \"%s\" to \n"
1696 "OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.\n",
1697 fromsec, (long)r->r_offset, tosec, tosec, tosec);
1700 static void extable_mismatch_handler(const char* modname, struct elf_info *elf,
1701 const struct sectioncheck* const mismatch,
1702 Elf_Rela* r, Elf_Sym* sym,
1703 const char *fromsec)
1705 const char* tosec = sec_name(elf, get_secindex(elf, sym));
1707 sec_mismatch_count++;
1709 report_extable_warnings(modname, elf, mismatch, r, sym, fromsec, tosec);
1711 if (match(tosec, mismatch->bad_tosec))
1712 fatal("The relocation at %s+0x%lx references\n"
1713 "section \"%s\" which is black-listed.\n"
1714 "Something is seriously wrong and should be fixed.\n"
1715 "You might get more information about where this is\n"
1716 "coming from by using scripts/check_extable.sh %s\n",
1717 fromsec, (long)r->r_offset, tosec, modname);
1718 else if (!is_executable_section(elf, get_secindex(elf, sym))) {
1719 if (is_extable_fault_address(r))
1720 fatal("The relocation at %s+0x%lx references\n"
1721 "section \"%s\" which is not executable, IOW\n"
1722 "it is not possible for the kernel to fault\n"
1723 "at that address. Something is seriously wrong\n"
1724 "and should be fixed.\n",
1725 fromsec, (long)r->r_offset, tosec);
1727 fatal("The relocation at %s+0x%lx references\n"
1728 "section \"%s\" which is not executable, IOW\n"
1729 "the kernel will fault if it ever tries to\n"
1730 "jump to it. Something is seriously wrong\n"
1731 "and should be fixed.\n",
1732 fromsec, (long)r->r_offset, tosec);
1736 static void check_section_mismatch(const char *modname, struct elf_info *elf,
1737 Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
1739 const char *tosec = sec_name(elf, get_secindex(elf, sym));
1740 const struct sectioncheck *mismatch = section_mismatch(fromsec, tosec);
1743 if (mismatch->handler)
1744 mismatch->handler(modname, elf, mismatch,
1747 default_mismatch_handler(modname, elf, mismatch,
1752 static unsigned int *reloc_location(struct elf_info *elf,
1753 Elf_Shdr *sechdr, Elf_Rela *r)
1755 return sym_get_data_by_offset(elf, sechdr->sh_info, r->r_offset);
1758 static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1760 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1761 unsigned int *location = reloc_location(elf, sechdr, r);
1765 r->r_addend = TO_NATIVE(*location);
1768 r->r_addend = TO_NATIVE(*location) + 4;
1769 /* For CONFIG_RELOCATABLE=y */
1770 if (elf->hdr->e_type == ET_EXEC)
1771 r->r_addend += r->r_offset;
1778 #define R_ARM_CALL 28
1780 #ifndef R_ARM_JUMP24
1781 #define R_ARM_JUMP24 29
1784 #ifndef R_ARM_THM_CALL
1785 #define R_ARM_THM_CALL 10
1787 #ifndef R_ARM_THM_JUMP24
1788 #define R_ARM_THM_JUMP24 30
1790 #ifndef R_ARM_THM_JUMP19
1791 #define R_ARM_THM_JUMP19 51
1794 static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1796 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1800 /* From ARM ABI: (S + A) | T */
1801 r->r_addend = (int)(long)
1802 (elf->symtab_start + ELF_R_SYM(r->r_info));
1807 case R_ARM_THM_CALL:
1808 case R_ARM_THM_JUMP24:
1809 case R_ARM_THM_JUMP19:
1810 /* From ARM ABI: ((S + A) | T) - P */
1811 r->r_addend = (int)(long)(elf->hdr +
1813 (r->r_offset - sechdr->sh_addr));
1821 static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
1823 unsigned int r_typ = ELF_R_TYPE(r->r_info);
1824 unsigned int *location = reloc_location(elf, sechdr, r);
1827 if (r_typ == R_MIPS_HI16)
1828 return 1; /* skip this */
1829 inst = TO_NATIVE(*location);
1832 r->r_addend = inst & 0xffff;
1835 r->r_addend = (inst & 0x03ffffff) << 2;
1844 static void section_rela(const char *modname, struct elf_info *elf,
1851 const char *fromsec;
1853 Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
1854 Elf_Rela *stop = (void *)start + sechdr->sh_size;
1856 fromsec = sech_name(elf, sechdr);
1857 fromsec += strlen(".rela");
1858 /* if from section (name) is know good then skip it */
1859 if (match(fromsec, section_white_list))
1862 for (rela = start; rela < stop; rela++) {
1863 r.r_offset = TO_NATIVE(rela->r_offset);
1864 #if KERNEL_ELFCLASS == ELFCLASS64
1865 if (elf->hdr->e_machine == EM_MIPS) {
1867 r_sym = ELF64_MIPS_R_SYM(rela->r_info);
1868 r_sym = TO_NATIVE(r_sym);
1869 r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
1870 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1872 r.r_info = TO_NATIVE(rela->r_info);
1873 r_sym = ELF_R_SYM(r.r_info);
1876 r.r_info = TO_NATIVE(rela->r_info);
1877 r_sym = ELF_R_SYM(r.r_info);
1879 r.r_addend = TO_NATIVE(rela->r_addend);
1880 sym = elf->symtab_start + r_sym;
1881 /* Skip special sections */
1882 if (is_shndx_special(sym->st_shndx))
1884 if (is_second_extable_reloc(start, rela, fromsec))
1885 find_extable_entry_size(fromsec, &r);
1886 check_section_mismatch(modname, elf, &r, sym, fromsec);
1890 static void section_rel(const char *modname, struct elf_info *elf,
1897 const char *fromsec;
1899 Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
1900 Elf_Rel *stop = (void *)start + sechdr->sh_size;
1902 fromsec = sech_name(elf, sechdr);
1903 fromsec += strlen(".rel");
1904 /* if from section (name) is know good then skip it */
1905 if (match(fromsec, section_white_list))
1908 for (rel = start; rel < stop; rel++) {
1909 r.r_offset = TO_NATIVE(rel->r_offset);
1910 #if KERNEL_ELFCLASS == ELFCLASS64
1911 if (elf->hdr->e_machine == EM_MIPS) {
1913 r_sym = ELF64_MIPS_R_SYM(rel->r_info);
1914 r_sym = TO_NATIVE(r_sym);
1915 r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
1916 r.r_info = ELF64_R_INFO(r_sym, r_typ);
1918 r.r_info = TO_NATIVE(rel->r_info);
1919 r_sym = ELF_R_SYM(r.r_info);
1922 r.r_info = TO_NATIVE(rel->r_info);
1923 r_sym = ELF_R_SYM(r.r_info);
1926 switch (elf->hdr->e_machine) {
1928 if (addend_386_rel(elf, sechdr, &r))
1932 if (addend_arm_rel(elf, sechdr, &r))
1936 if (addend_mips_rel(elf, sechdr, &r))
1940 sym = elf->symtab_start + r_sym;
1941 /* Skip special sections */
1942 if (is_shndx_special(sym->st_shndx))
1944 if (is_second_extable_reloc(start, rel, fromsec))
1945 find_extable_entry_size(fromsec, &r);
1946 check_section_mismatch(modname, elf, &r, sym, fromsec);
1951 * A module includes a number of sections that are discarded
1952 * either when loaded or when used as built-in.
1953 * For loaded modules all functions marked __init and all data
1954 * marked __initdata will be discarded when the module has been initialized.
1955 * Likewise for modules used built-in the sections marked __exit
1956 * are discarded because __exit marked function are supposed to be called
1957 * only when a module is unloaded which never happens for built-in modules.
1958 * The check_sec_ref() function traverses all relocation records
1959 * to find all references to a section that reference a section that will
1960 * be discarded and warns about it.
1962 static void check_sec_ref(struct module *mod, const char *modname,
1963 struct elf_info *elf)
1966 Elf_Shdr *sechdrs = elf->sechdrs;
1968 /* Walk through all sections */
1969 for (i = 0; i < elf->num_sections; i++) {
1970 check_section(modname, elf, &elf->sechdrs[i]);
1971 /* We want to process only relocation sections and not .init */
1972 if (sechdrs[i].sh_type == SHT_RELA)
1973 section_rela(modname, elf, &elf->sechdrs[i]);
1974 else if (sechdrs[i].sh_type == SHT_REL)
1975 section_rel(modname, elf, &elf->sechdrs[i]);
1979 static char *remove_dot(char *s)
1981 size_t n = strcspn(s, ".");
1984 size_t m = strspn(s + n + 1, "0123456789");
1985 if (m && (s[n + m] == '.' || s[n + m] == 0))
1991 static void read_symbols(const char *modname)
1993 const char *symname;
1998 struct elf_info info = { };
2001 if (!parse_elf(&info, modname))
2007 /* strip trailing .o */
2008 tmp = NOFAIL(strdup(modname));
2009 tmp[strlen(tmp) - 2] = '\0';
2010 mod = new_module(tmp);
2014 if (!mod->is_vmlinux) {
2015 license = get_modinfo(&info, "license");
2017 warn("missing MODULE_LICENSE() in %s\n", modname);
2019 if (license_is_gpl_compatible(license))
2020 mod->gpl_compatible = 1;
2022 mod->gpl_compatible = 0;
2025 license = get_next_modinfo(&info, "license", license);
2028 namespace = get_modinfo(&info, "import_ns");
2030 add_namespace(&mod->imported_namespaces, namespace);
2031 namespace = get_next_modinfo(&info, "import_ns",
2036 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
2037 symname = remove_dot(info.strtab + sym->st_name);
2039 handle_symbol(mod, &info, sym, symname);
2040 handle_moddevtable(mod, &info, sym, symname);
2043 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
2044 symname = remove_dot(info.strtab + sym->st_name);
2046 /* Apply symbol namespaces from __kstrtabns_<symbol> entries. */
2047 if (strstarts(symname, "__kstrtabns_"))
2048 sym_update_namespace(symname + strlen("__kstrtabns_"),
2049 namespace_from_kstrtabns(&info,
2052 if (strstarts(symname, "__crc_"))
2053 handle_modversion(mod, &info, sym,
2054 symname + strlen("__crc_"));
2057 // check for static EXPORT_SYMBOL_* functions && global vars
2058 for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
2059 unsigned char bind = ELF_ST_BIND(sym->st_info);
2061 if (bind == STB_GLOBAL || bind == STB_WEAK) {
2063 find_symbol(remove_dot(info.strtab +
2071 check_sec_ref(mod, modname, &info);
2073 if (!mod->is_vmlinux) {
2074 version = get_modinfo(&info, "version");
2075 if (version || all_versions)
2076 get_src_version(modname, mod->srcversion,
2077 sizeof(mod->srcversion) - 1);
2080 parse_elf_finish(&info);
2082 /* Our trick to get versioning for module struct etc. - it's
2083 * never passed as an argument to an exported function, so
2084 * the automatic versioning doesn't pick it up, but it's really
2085 * important anyhow */
2087 mod->unres = alloc_symbol("module_layout", 0, mod->unres);
2090 static void read_symbols_from_files(const char *filename)
2093 char fname[PATH_MAX];
2095 if (strcmp(filename, "-") != 0) {
2096 in = fopen(filename, "r");
2098 fatal("Can't open filenames file %s: %m", filename);
2101 while (fgets(fname, PATH_MAX, in) != NULL) {
2102 if (strends(fname, "\n"))
2103 fname[strlen(fname)-1] = '\0';
2104 read_symbols(fname);
2113 /* We first write the generated file into memory using the
2114 * following helper, then compare to the file on disk and
2115 * only update the later if anything changed */
2117 void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
2118 const char *fmt, ...)
2125 len = vsnprintf(tmp, SZ, fmt, ap);
2126 buf_write(buf, tmp, len);
2130 void buf_write(struct buffer *buf, const char *s, int len)
2132 if (buf->size - buf->pos < len) {
2133 buf->size += len + SZ;
2134 buf->p = NOFAIL(realloc(buf->p, buf->size));
2136 strncpy(buf->p + buf->pos, s, len);
2140 static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
2144 fatal("GPL-incompatible module %s.ko uses GPL-only symbol '%s'\n",
2147 case export_unused_gpl:
2148 fatal("GPL-incompatible module %s.ko uses GPL-only symbol marked UNUSED '%s'\n",
2151 case export_gpl_future:
2152 warn("GPL-incompatible module %s.ko uses future GPL-only symbol '%s'\n",
2157 case export_unknown:
2163 static void check_for_unused(enum export exp, const char *m, const char *s)
2167 case export_unused_gpl:
2168 warn("module %s.ko uses symbol '%s' marked UNUSED\n",
2177 static int check_exports(struct module *mod)
2179 struct symbol *s, *exp;
2182 for (s = mod->unres; s; s = s->next) {
2183 const char *basename;
2184 exp = find_symbol(s->name);
2185 if (!exp || exp->module == mod) {
2186 if (have_vmlinux && !s->weak) {
2187 modpost_log(warn_unresolved ? LOG_WARN : LOG_ERROR,
2188 "\"%s\" [%s.ko] undefined!\n",
2189 s->name, mod->name);
2190 if (!warn_unresolved)
2195 basename = strrchr(mod->name, '/');
2199 basename = mod->name;
2201 if (exp->namespace &&
2202 !module_imports_namespace(mod, exp->namespace)) {
2203 modpost_log(allow_missing_ns_imports ? LOG_WARN : LOG_ERROR,
2204 "module %s uses symbol %s from namespace %s, but does not import it.\n",
2205 basename, exp->name, exp->namespace);
2206 if (!allow_missing_ns_imports)
2208 add_namespace(&mod->missing_namespaces, exp->namespace);
2211 if (!mod->gpl_compatible)
2212 check_for_gpl_usage(exp->export, basename, exp->name);
2213 check_for_unused(exp->export, basename, exp->name);
2219 static int check_modname_len(struct module *mod)
2221 const char *mod_name;
2223 mod_name = strrchr(mod->name, '/');
2224 if (mod_name == NULL)
2225 mod_name = mod->name;
2228 if (strlen(mod_name) >= MODULE_NAME_LEN) {
2229 merror("module name is too long [%s.ko]\n", mod->name);
2237 * Header for the generated file
2239 static void add_header(struct buffer *b, struct module *mod)
2241 buf_printf(b, "#include <linux/module.h>\n");
2243 * Include build-salt.h after module.h in order to
2244 * inherit the definitions.
2246 buf_printf(b, "#define INCLUDE_VERMAGIC\n");
2247 buf_printf(b, "#include <linux/build-salt.h>\n");
2248 buf_printf(b, "#include <linux/vermagic.h>\n");
2249 buf_printf(b, "#include <linux/compiler.h>\n");
2250 buf_printf(b, "\n");
2251 buf_printf(b, "BUILD_SALT;\n");
2252 buf_printf(b, "\n");
2253 buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
2254 buf_printf(b, "MODULE_INFO(name, KBUILD_MODNAME);\n");
2255 buf_printf(b, "\n");
2256 buf_printf(b, "__visible struct module __this_module\n");
2257 buf_printf(b, "__section(\".gnu.linkonce.this_module\") = {\n");
2258 buf_printf(b, "\t.name = KBUILD_MODNAME,\n");
2260 buf_printf(b, "\t.init = init_module,\n");
2261 if (mod->has_cleanup)
2262 buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
2263 "\t.exit = cleanup_module,\n"
2265 buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n");
2266 buf_printf(b, "};\n");
2269 static void add_intree_flag(struct buffer *b, int is_intree)
2272 buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n");
2275 /* Cannot check for assembler */
2276 static void add_retpoline(struct buffer *b)
2278 buf_printf(b, "\n#ifdef CONFIG_RETPOLINE\n");
2279 buf_printf(b, "MODULE_INFO(retpoline, \"Y\");\n");
2280 buf_printf(b, "#endif\n");
2283 static void add_staging_flag(struct buffer *b, const char *name)
2285 if (strstarts(name, "drivers/staging"))
2286 buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
2290 * Record CRCs for unresolved symbols
2292 static int add_versions(struct buffer *b, struct module *mod)
2294 struct symbol *s, *exp;
2297 for (s = mod->unres; s; s = s->next) {
2298 exp = find_symbol(s->name);
2299 if (!exp || exp->module == mod)
2301 s->module = exp->module;
2302 s->crc_valid = exp->crc_valid;
2309 buf_printf(b, "\n");
2310 buf_printf(b, "static const struct modversion_info ____versions[]\n");
2311 buf_printf(b, "__used __section(\"__versions\") = {\n");
2313 for (s = mod->unres; s; s = s->next) {
2316 if (!s->crc_valid) {
2317 warn("\"%s\" [%s.ko] has no CRC!\n",
2318 s->name, mod->name);
2321 if (strlen(s->name) >= MODULE_NAME_LEN) {
2322 merror("too long symbol \"%s\" [%s.ko]\n",
2323 s->name, mod->name);
2327 buf_printf(b, "\t{ %#8x, \"%s\" },\n",
2331 buf_printf(b, "};\n");
2336 static void add_depends(struct buffer *b, struct module *mod)
2341 /* Clear ->seen flag of modules that own symbols needed by this. */
2342 for (s = mod->unres; s; s = s->next)
2344 s->module->seen = s->module->is_vmlinux;
2346 buf_printf(b, "\n");
2347 buf_printf(b, "MODULE_INFO(depends, \"");
2348 for (s = mod->unres; s; s = s->next) {
2353 if (s->module->seen)
2356 s->module->seen = 1;
2357 p = strrchr(s->module->name, '/');
2361 p = s->module->name;
2362 buf_printf(b, "%s%s", first ? "" : ",", p);
2365 buf_printf(b, "\");\n");
2368 static void add_srcversion(struct buffer *b, struct module *mod)
2370 if (mod->srcversion[0]) {
2371 buf_printf(b, "\n");
2372 buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
2377 static void write_buf(struct buffer *b, const char *fname)
2381 file = fopen(fname, "w");
2386 if (fwrite(b->p, 1, b->pos, file) != b->pos) {
2390 if (fclose(file) != 0) {
2396 static void write_if_changed(struct buffer *b, const char *fname)
2402 file = fopen(fname, "r");
2406 if (fstat(fileno(file), &st) < 0)
2409 if (st.st_size != b->pos)
2412 tmp = NOFAIL(malloc(b->pos));
2413 if (fread(tmp, 1, b->pos, file) != b->pos)
2416 if (memcmp(tmp, b->p, b->pos) != 0)
2428 write_buf(b, fname);
2431 /* parse Module.symvers file. line format:
2432 * 0x12345678<tab>symbol<tab>module<tab>export<tab>namespace
2434 static void read_dump(const char *fname)
2436 char *buf, *pos, *line;
2438 buf = read_text_file(fname);
2440 /* No symbol versions, silently ignore */
2445 while ((line = get_line(&pos))) {
2446 char *symname, *namespace, *modname, *d, *export;
2451 if (!(symname = strchr(line, '\t')))
2454 if (!(modname = strchr(symname, '\t')))
2457 if (!(export = strchr(modname, '\t')))
2460 if (!(namespace = strchr(export, '\t')))
2462 *namespace++ = '\0';
2464 crc = strtoul(line, &d, 16);
2465 if (*symname == '\0' || *modname == '\0' || *d != '\0')
2467 mod = find_module(modname);
2469 mod = new_module(modname);
2472 s = sym_add_exported(symname, mod, export_no(export));
2474 sym_set_crc(symname, crc);
2475 sym_update_namespace(symname, namespace);
2481 fatal("parse error in symbol dump file\n");
2484 /* For normal builds always dump all symbols.
2485 * For external modules only dump symbols
2486 * that are not read from kernel Module.symvers.
2488 static int dump_sym(struct symbol *sym)
2490 if (!external_module)
2492 if (sym->module->from_dump)
2497 static void write_dump(const char *fname)
2499 struct buffer buf = { };
2500 struct symbol *symbol;
2501 const char *namespace;
2504 for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
2505 symbol = symbolhash[n];
2507 if (dump_sym(symbol)) {
2508 namespace = symbol->namespace;
2509 buf_printf(&buf, "0x%08x\t%s\t%s\t%s\t%s\n",
2510 symbol->crc, symbol->name,
2511 symbol->module->name,
2512 export_str(symbol->export),
2513 namespace ? namespace : "");
2515 symbol = symbol->next;
2518 write_buf(&buf, fname);
2522 static void write_namespace_deps_files(const char *fname)
2525 struct namespace_list *ns;
2526 struct buffer ns_deps_buf = {};
2528 for (mod = modules; mod; mod = mod->next) {
2530 if (mod->from_dump || !mod->missing_namespaces)
2533 buf_printf(&ns_deps_buf, "%s.ko:", mod->name);
2535 for (ns = mod->missing_namespaces; ns; ns = ns->next)
2536 buf_printf(&ns_deps_buf, " %s", ns->namespace);
2538 buf_printf(&ns_deps_buf, "\n");
2541 write_if_changed(&ns_deps_buf, fname);
2542 free(ns_deps_buf.p);
2546 struct dump_list *next;
2550 int main(int argc, char **argv)
2553 struct buffer buf = { };
2554 char *missing_namespace_deps = NULL;
2555 char *dump_write = NULL, *files_source = NULL;
2559 struct dump_list *dump_read_start = NULL;
2560 struct dump_list **dump_read_iter = &dump_read_start;
2562 while ((opt = getopt(argc, argv, "ei:mnT:o:awENd:")) != -1) {
2565 external_module = 1;
2569 NOFAIL(calloc(1, sizeof(**dump_read_iter)));
2570 (*dump_read_iter)->file = optarg;
2571 dump_read_iter = &(*dump_read_iter)->next;
2577 ignore_missing_files = 1;
2580 dump_write = optarg;
2586 files_source = optarg;
2589 warn_unresolved = 1;
2592 sec_mismatch_fatal = 1;
2595 allow_missing_ns_imports = 1;
2598 missing_namespace_deps = optarg;
2605 while (dump_read_start) {
2606 struct dump_list *tmp;
2608 read_dump(dump_read_start->file);
2609 tmp = dump_read_start->next;
2610 free(dump_read_start);
2611 dump_read_start = tmp;
2614 while (optind < argc)
2615 read_symbols(argv[optind++]);
2618 read_symbols_from_files(files_source);
2621 * When there's no vmlinux, don't print warnings about
2622 * unresolved symbols (since there'll be too many ;)
2625 warn("Symbol info of vmlinux is missing. Unresolved symbol check will be entirely skipped.\n");
2629 for (mod = modules; mod; mod = mod->next) {
2630 char fname[PATH_MAX];
2632 if (mod->is_vmlinux || mod->from_dump)
2637 err |= check_modname_len(mod);
2638 err |= check_exports(mod);
2640 add_header(&buf, mod);
2641 add_intree_flag(&buf, !external_module);
2642 add_retpoline(&buf);
2643 add_staging_flag(&buf, mod->name);
2644 err |= add_versions(&buf, mod);
2645 add_depends(&buf, mod);
2646 add_moddevtable(&buf, mod);
2647 add_srcversion(&buf, mod);
2649 sprintf(fname, "%s.mod.c", mod->name);
2650 write_if_changed(&buf, fname);
2653 if (missing_namespace_deps)
2654 write_namespace_deps_files(missing_namespace_deps);
2657 write_dump(dump_write);
2658 if (sec_mismatch_count && sec_mismatch_fatal)
2659 fatal("Section mismatches detected.\n"
2660 "Set CONFIG_SECTION_MISMATCH_WARN_ONLY=y to allow them.\n");
2661 for (n = 0; n < SYMBOL_HASH_SIZE; n++) {
2664 for (s = symbolhash[n]; s; s = s->next) {
2666 warn("\"%s\" [%s] is a static %s\n",
2667 s->name, s->module->name,
2668 export_str(s->export));