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scripts/mod/modpost.c
65.6 KB
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/* Postprocess module symbol versions * * Copyright 2003 Kai Germaschewski * Copyright 2002-2004 Rusty Russell, IBM Corporation |
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* Copyright 2006-2008 Sam Ravnborg |
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* Based in part on module-init-tools/depmod.c,file2alias * * This software may be used and distributed according to the terms * of the GNU General Public License, incorporated herein by reference. * * Usage: modpost vmlinux module1.o module2.o ... */ |
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#define _GNU_SOURCE #include <stdio.h> |
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#include <ctype.h> |
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#include <string.h> |
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#include <limits.h> |
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#include <stdbool.h> |
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#include <errno.h> |
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#include "modpost.h" |
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#include "../../include/linux/license.h" |
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/* Are we using CONFIG_MODVERSIONS? */ |
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static int modversions = 0; |
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/* Warn about undefined symbols? (do so if we have vmlinux) */ |
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static int have_vmlinux = 0; |
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/* Is CONFIG_MODULE_SRCVERSION_ALL set? */ static int all_versions = 0; |
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/* If we are modposting external module set to 1 */ static int external_module = 0; |
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/* Warn about section mismatch in vmlinux if set to 1 */ static int vmlinux_section_warnings = 1; |
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/* Only warn about unresolved symbols */ static int warn_unresolved = 0; |
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/* How a symbol is exported */ |
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static int sec_mismatch_count = 0; static int sec_mismatch_verbose = 1; |
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static int sec_mismatch_fatal = 0; |
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/* ignore missing files */ static int ignore_missing_files; |
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enum export { export_plain, export_unused, export_gpl, export_unused_gpl, export_gpl_future, export_unknown }; |
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/* In kernel, this size is defined in linux/module.h; * here we use Elf_Addr instead of long for covering cross-compile */ #define MODULE_NAME_LEN (64 - sizeof(Elf_Addr)) |
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#define PRINTF __attribute__ ((format (printf, 1, 2))) PRINTF void fatal(const char *fmt, ...) |
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{ va_list arglist; fprintf(stderr, "FATAL: "); va_start(arglist, fmt); vfprintf(stderr, fmt, arglist); va_end(arglist); exit(1); } |
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PRINTF void warn(const char *fmt, ...) |
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{ va_list arglist; fprintf(stderr, "WARNING: "); va_start(arglist, fmt); vfprintf(stderr, fmt, arglist); va_end(arglist); } |
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PRINTF void merror(const char *fmt, ...) |
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{ va_list arglist; fprintf(stderr, "ERROR: "); va_start(arglist, fmt); vfprintf(stderr, fmt, arglist); va_end(arglist); } |
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static inline bool strends(const char *str, const char *postfix) { if (strlen(str) < strlen(postfix)) return false; return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0; } |
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static int is_vmlinux(const char *modname) { const char *myname; |
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myname = strrchr(modname, '/'); if (myname) |
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myname++; else myname = modname; |
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return (strcmp(myname, "vmlinux") == 0) || (strcmp(myname, "vmlinux.o") == 0); |
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} |
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void *do_nofail(void *ptr, const char *expr) { |
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if (!ptr) |
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fatal("modpost: Memory allocation failure: %s. ", expr); |
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return ptr; } /* A list of all modules we processed */ |
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static struct module *modules; |
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static struct module *find_module(const char *modname) |
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{ struct module *mod; for (mod = modules; mod; mod = mod->next) if (strcmp(mod->name, modname) == 0) break; return mod; } |
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static struct module *new_module(const char *modname) |
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{ struct module *mod; |
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char *p; |
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mod = NOFAIL(malloc(sizeof(*mod))); memset(mod, 0, sizeof(*mod)); p = NOFAIL(strdup(modname)); /* strip trailing .o */ |
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if (strends(p, ".o")) { p[strlen(p) - 2] = '\0'; mod->is_dot_o = 1; } |
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/* add to list */ mod->name = p; |
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mod->gpl_compatible = -1; |
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mod->next = modules; modules = mod; return mod; } /* A hash of all exported symbols, * struct symbol is also used for lists of unresolved symbols */ #define SYMBOL_HASH_SIZE 1024 struct symbol { struct symbol *next; struct module *module; unsigned int crc; int crc_valid; unsigned int weak:1; |
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unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */ unsigned int kernel:1; /* 1 if symbol is from kernel * (only for external modules) **/ |
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unsigned int preloaded:1; /* 1 if symbol from Module.symvers, or crc */ |
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enum export export; /* Type of export */ |
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char name[0]; }; static struct symbol *symbolhash[SYMBOL_HASH_SIZE]; /* This is based on the hash agorithm from gdbm, via tdb */ static inline unsigned int tdb_hash(const char *name) { unsigned value; /* Used to compute the hash value. */ unsigned i; /* Used to cycle through random values. */ /* Set the initial value from the key size. */ |
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for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++) |
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value = (value + (((unsigned char *)name)[i] << (i*5 % 24))); return (1103515243 * value + 12345); } |
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/** * Allocate a new symbols for use in the hash of exported symbols or * the list of unresolved symbols per module **/ static struct symbol *alloc_symbol(const char *name, unsigned int weak, struct symbol *next) |
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{ struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1)); memset(s, 0, sizeof(*s)); strcpy(s->name, name); s->weak = weak; s->next = next; return s; } /* For the hash of exported symbols */ |
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static struct symbol *new_symbol(const char *name, struct module *module, enum export export) |
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{ unsigned int hash; struct symbol *new; hash = tdb_hash(name) % SYMBOL_HASH_SIZE; new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]); new->module = module; |
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new->export = export; |
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return new; |
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} |
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static struct symbol *find_symbol(const char *name) |
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{ struct symbol *s; /* For our purposes, .foo matches foo. PPC64 needs this. */ if (name[0] == '.') name++; |
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for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) { |
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if (strcmp(s->name, name) == 0) return s; } return NULL; } |
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static const struct { |
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const char *str; enum export export; } export_list[] = { { .str = "EXPORT_SYMBOL", .export = export_plain }, |
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{ .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused }, |
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{ .str = "EXPORT_SYMBOL_GPL", .export = export_gpl }, |
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{ .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl }, |
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{ .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future }, { .str = "(unknown)", .export = export_unknown }, }; static const char *export_str(enum export ex) { return export_list[ex].str; } |
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static enum export export_no(const char *s) |
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{ int i; |
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if (!s) return export_unknown; |
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for (i = 0; export_list[i].export != export_unknown; i++) { if (strcmp(export_list[i].str, s) == 0) return export_list[i].export; } return export_unknown; } |
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static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr) { return (void *)elf->hdr + elf->sechdrs[elf->secindex_strings].sh_offset + sechdr->sh_name; } static const char *sec_name(struct elf_info *elf, int secindex) { return sech_name(elf, &elf->sechdrs[secindex]); } |
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#define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0) static enum export export_from_secname(struct elf_info *elf, unsigned int sec) { const char *secname = sec_name(elf, sec); if (strstarts(secname, "___ksymtab+")) return export_plain; else if (strstarts(secname, "___ksymtab_unused+")) return export_unused; else if (strstarts(secname, "___ksymtab_gpl+")) return export_gpl; else if (strstarts(secname, "___ksymtab_unused_gpl+")) return export_unused_gpl; else if (strstarts(secname, "___ksymtab_gpl_future+")) return export_gpl_future; else return export_unknown; } |
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static enum export export_from_sec(struct elf_info *elf, unsigned int sec) |
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{ if (sec == elf->export_sec) return export_plain; |
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else if (sec == elf->export_unused_sec) return export_unused; |
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else if (sec == elf->export_gpl_sec) return export_gpl; |
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else if (sec == elf->export_unused_gpl_sec) return export_unused_gpl; |
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else if (sec == elf->export_gpl_future_sec) return export_gpl_future; else return export_unknown; } |
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/** * Add an exported symbol - it may have already been added without a * CRC, in this case just update the CRC **/ |
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static struct symbol *sym_add_exported(const char *name, struct module *mod, enum export export) |
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{ struct symbol *s = find_symbol(name); if (!s) { |
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s = new_symbol(name, mod, export); |
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} else { if (!s->preloaded) { |
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warn("%s: '%s' exported twice. Previous export " |
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"was in %s%s ", mod->name, name, s->module->name, is_vmlinux(s->module->name) ?"":".ko"); |
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} else { |
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/* In case Module.symvers was out of date */ |
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s->module = mod; |
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} |
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} |
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s->preloaded = 0; |
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s->vmlinux = is_vmlinux(mod->name); s->kernel = 0; |
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s->export = export; |
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return s; } static void sym_update_crc(const char *name, struct module *mod, |
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unsigned int crc, enum export export) |
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{ struct symbol *s = find_symbol(name); |
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if (!s) { |
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s = new_symbol(name, mod, export); |
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/* Don't complain when we find it later. */ s->preloaded = 1; } |
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s->crc = crc; s->crc_valid = 1; |
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} |
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void *grab_file(const char *filename, unsigned long *size) |
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{ struct stat st; |
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void *map = MAP_FAILED; |
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int fd; fd = open(filename, O_RDONLY); |
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if (fd < 0) |
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return NULL; |
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if (fstat(fd, &st)) goto failed; |
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*size = st.st_size; map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); |
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failed: close(fd); |
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if (map == MAP_FAILED) return NULL; return map; } |
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/** * Return a copy of the next line in a mmap'ed file. * spaces in the beginning of the line is trimmed away. * Return a pointer to a static buffer. **/ |
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char *get_next_line(unsigned long *pos, void *file, unsigned long size) |
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{ static char line[4096]; int skip = 1; size_t len = 0; signed char *p = (signed char *)file + *pos; char *s = line; |
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for (; *pos < size ; (*pos)++) { |
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if (skip && isspace(*p)) { p++; continue; } skip = 0; if (*p != ' ' && (*pos < size)) { len++; *s++ = *p++; if (len > 4095) break; /* Too long, stop */ } else { /* End of string */ *s = '\0'; return line; } } /* End of buffer */ return NULL; } |
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void release_file(void *file, unsigned long size) |
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{ munmap(file, size); } |
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static int parse_elf(struct elf_info *info, const char *filename) |
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{ unsigned int i; |
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Elf_Ehdr *hdr; |
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Elf_Shdr *sechdrs; Elf_Sym *sym; |
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const char *secstrings; unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U; |
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hdr = grab_file(filename, &info->size); if (!hdr) { |
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if (ignore_missing_files) { fprintf(stderr, "%s: %s (ignored) ", filename, strerror(errno)); return 0; } |
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perror(filename); |
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exit(1); |
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} info->hdr = hdr; |
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if (info->size < sizeof(*hdr)) { /* file too small, assume this is an empty .o file */ return 0; } /* Is this a valid ELF file? */ if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || (hdr->e_ident[EI_MAG1] != ELFMAG1) || (hdr->e_ident[EI_MAG2] != ELFMAG2) || (hdr->e_ident[EI_MAG3] != ELFMAG3)) { /* Not an ELF file - silently ignore it */ return 0; } |
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/* Fix endianness in ELF header */ |
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hdr->e_type = TO_NATIVE(hdr->e_type); hdr->e_machine = TO_NATIVE(hdr->e_machine); hdr->e_version = TO_NATIVE(hdr->e_version); hdr->e_entry = TO_NATIVE(hdr->e_entry); hdr->e_phoff = TO_NATIVE(hdr->e_phoff); hdr->e_shoff = TO_NATIVE(hdr->e_shoff); hdr->e_flags = TO_NATIVE(hdr->e_flags); hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize); hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize); hdr->e_phnum = TO_NATIVE(hdr->e_phnum); hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize); hdr->e_shnum = TO_NATIVE(hdr->e_shnum); hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx); |
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sechdrs = (void *)hdr + hdr->e_shoff; info->sechdrs = sechdrs; |
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/* Check if file offset is correct */ if (hdr->e_shoff > info->size) { |
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fatal("section header offset=%lu in file '%s' is bigger than " "filesize=%lu ", (unsigned long)hdr->e_shoff, filename, info->size); |
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return 0; } |
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if (hdr->e_shnum == SHN_UNDEF) { |
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/* * There are more than 64k sections, * read count from .sh_size. |
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*/ info->num_sections = TO_NATIVE(sechdrs[0].sh_size); } else { info->num_sections = hdr->e_shnum; } if (hdr->e_shstrndx == SHN_XINDEX) { |
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info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link); |
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} else { info->secindex_strings = hdr->e_shstrndx; } |
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/* Fix endianness in section headers */ |
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for (i = 0; i < info->num_sections; i++) { |
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sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name); sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type); sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags); sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr); sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset); sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size); sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link); sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info); sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign); sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize); |
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} /* Find symbol table. */ |
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secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset; for (i = 1; i < info->num_sections; i++) { |
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const char *secname; |
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int nobits = sechdrs[i].sh_type == SHT_NOBITS; |
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if (!nobits && sechdrs[i].sh_offset > info->size) { |
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fatal("%s is truncated. sechdrs[i].sh_offset=%lu > " "sizeof(*hrd)=%zu ", filename, (unsigned long)sechdrs[i].sh_offset, sizeof(*hdr)); |
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return 0; } |
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secname = secstrings + sechdrs[i].sh_name; if (strcmp(secname, ".modinfo") == 0) { |
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if (nobits) fatal("%s has NOBITS .modinfo ", filename); |
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info->modinfo = (void *)hdr + sechdrs[i].sh_offset; info->modinfo_len = sechdrs[i].sh_size; |
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} else if (strcmp(secname, "__ksymtab") == 0) info->export_sec = i; |
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else if (strcmp(secname, "__ksymtab_unused") == 0) info->export_unused_sec = i; |
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else if (strcmp(secname, "__ksymtab_gpl") == 0) info->export_gpl_sec = i; |
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else if (strcmp(secname, "__ksymtab_unused_gpl") == 0) info->export_unused_gpl_sec = i; |
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else if (strcmp(secname, "__ksymtab_gpl_future") == 0) info->export_gpl_future_sec = i; |
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if (sechdrs[i].sh_type == SHT_SYMTAB) { unsigned int sh_link_idx; symtab_idx = i; info->symtab_start = (void *)hdr + sechdrs[i].sh_offset; info->symtab_stop = (void *)hdr + sechdrs[i].sh_offset + sechdrs[i].sh_size; |
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sh_link_idx = sechdrs[i].sh_link; |
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info->strtab = (void *)hdr + sechdrs[sh_link_idx].sh_offset; } |
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|
527 528 529 530 531 532 533 534 |
/* 32bit section no. table? ("more than 64k sections") */ if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) { symtab_shndx_idx = i; info->symtab_shndx_start = (void *)hdr + sechdrs[i].sh_offset; info->symtab_shndx_stop = (void *)hdr + sechdrs[i].sh_offset + sechdrs[i].sh_size; } |
1da177e4c
|
535 |
} |
df578e7d8
|
536 |
if (!info->symtab_start) |
cb80514d9
|
537 538 |
fatal("%s has no symtab? ", filename); |
df578e7d8
|
539 |
|
1da177e4c
|
540 541 542 543 544 545 546 |
/* Fix endianness in symbols */ for (sym = info->symtab_start; sym < info->symtab_stop; sym++) { sym->st_shndx = TO_NATIVE(sym->st_shndx); sym->st_name = TO_NATIVE(sym->st_name); sym->st_value = TO_NATIVE(sym->st_value); sym->st_size = TO_NATIVE(sym->st_size); } |
1ce53adf1
|
547 548 549 |
if (symtab_shndx_idx != ~0U) { Elf32_Word *p; |
6845756b2
|
550 |
if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link) |
1ce53adf1
|
551 552 |
fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u ", |
6845756b2
|
553 |
filename, sechdrs[symtab_shndx_idx].sh_link, |
1ce53adf1
|
554 555 556 557 558 559 |
symtab_idx); /* Fix endianness */ for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop; p++) *p = TO_NATIVE(*p); } |
85bd2fddd
|
560 |
return 1; |
1da177e4c
|
561 |
} |
5c3ead8c7
|
562 |
static void parse_elf_finish(struct elf_info *info) |
1da177e4c
|
563 564 565 |
{ release_file(info->hdr, info->size); } |
4d7365d66
|
566 567 568 |
static int ignore_undef_symbol(struct elf_info *info, const char *symname) { /* ignore __this_module, it will be resolved shortly */ |
b2c5cdcfd
|
569 |
if (strcmp(symname, "__this_module") == 0) |
4d7365d66
|
570 571 572 573 574 575 |
return 1; /* ignore global offset table */ if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0) return 1; if (info->hdr->e_machine == EM_PPC) /* Special register function linked on all modules during final link of .ko */ |
d62c47652
|
576 577 578 579 580 581 |
if (strstarts(symname, "_restgpr_") || strstarts(symname, "_savegpr_") || strstarts(symname, "_rest32gpr_") || strstarts(symname, "_save32gpr_") || strstarts(symname, "_restvr_") || strstarts(symname, "_savevr_")) |
4d7365d66
|
582 |
return 1; |
7fca5dc8a
|
583 584 |
if (info->hdr->e_machine == EM_PPC64) /* Special register function linked on all modules during final link of .ko */ |
d62c47652
|
585 586 587 588 |
if (strstarts(symname, "_restgpr0_") || strstarts(symname, "_savegpr0_") || strstarts(symname, "_restvr_") || strstarts(symname, "_savevr_") || |
c153693d7
|
589 |
strcmp(symname, ".TOC.") == 0) |
7fca5dc8a
|
590 |
return 1; |
4d7365d66
|
591 592 593 |
/* Do not ignore this symbol */ return 0; } |
5c3ead8c7
|
594 595 |
static void handle_modversions(struct module *mod, struct elf_info *info, Elf_Sym *sym, const char *symname) |
1da177e4c
|
596 597 |
{ unsigned int crc; |
62a263561
|
598 |
enum export export; |
d8c1eb86e
|
599 |
bool is_crc = false; |
62a263561
|
600 |
|
258f74263
|
601 |
if ((!is_vmlinux(mod->name) || mod->is_dot_o) && |
d62c47652
|
602 |
strstarts(symname, "__ksymtab")) |
62a263561
|
603 604 605 |
export = export_from_secname(info, get_secindex(info, sym)); else export = export_from_sec(info, get_secindex(info, sym)); |
1da177e4c
|
606 |
|
b5064654c
|
607 |
/* CRC'd symbol */ |
d62c47652
|
608 |
if (strstarts(symname, "__crc_")) { |
d8c1eb86e
|
609 |
is_crc = true; |
b5064654c
|
610 |
crc = (unsigned int) sym->st_value; |
56067812d
|
611 612 613 614 615 616 617 618 |
if (sym->st_shndx != SHN_UNDEF && sym->st_shndx != SHN_ABS) { unsigned int *crcp; /* symbol points to the CRC in the ELF object */ crcp = (void *)info->hdr + sym->st_value + info->sechdrs[sym->st_shndx].sh_offset - (info->hdr->e_type != ET_REL ? info->sechdrs[sym->st_shndx].sh_addr : 0); |
aa7f29f87
|
619 |
crc = TO_NATIVE(*crcp); |
56067812d
|
620 |
} |
b2c5cdcfd
|
621 |
sym_update_crc(symname + strlen("__crc_"), mod, crc, |
b5064654c
|
622 623 |
export); } |
1da177e4c
|
624 625 |
switch (sym->st_shndx) { case SHN_COMMON: |
d62c47652
|
626 |
if (strstarts(symname, "__gnu_lto_")) { |
ef178f923
|
627 628 629 630 |
/* Should warn here, but modpost runs before the linker */ } else warn("\"%s\" [%s] is COMMON symbol ", symname, mod->name); |
1da177e4c
|
631 |
break; |
1da177e4c
|
632 633 634 635 636 |
case SHN_UNDEF: /* undefined symbol */ if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL && ELF_ST_BIND(sym->st_info) != STB_WEAK) break; |
4d7365d66
|
637 |
if (ignore_undef_symbol(info, symname)) |
1da177e4c
|
638 |
break; |
8d5290149
|
639 640 641 642 643 644 |
/* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */ #if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER) /* add compatibility with older glibc */ #ifndef STT_SPARC_REGISTER #define STT_SPARC_REGISTER STT_REGISTER #endif |
1da177e4c
|
645 646 647 |
if (info->hdr->e_machine == EM_SPARC || info->hdr->e_machine == EM_SPARCV9) { /* Ignore register directives. */ |
8d5290149
|
648 |
if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER) |
1da177e4c
|
649 |
break; |
62070fa42
|
650 |
if (symname[0] == '.') { |
1f3aa9002
|
651 |
char *munged = NOFAIL(strdup(symname)); |
62070fa42
|
652 653 654 655 |
munged[0] = '_'; munged[1] = toupper(munged[1]); symname = munged; } |
1da177e4c
|
656 657 |
} #endif |
62070fa42
|
658 |
|
d8c1eb86e
|
659 660 |
if (is_crc) { const char *e = is_vmlinux(mod->name) ?"":".ko"; |
b2c5cdcfd
|
661 662 663 |
warn("EXPORT symbol \"%s\" [%s%s] version generation failed, symbol will not be versioned. ", symname + strlen("__crc_"), mod->name, e); |
d8c1eb86e
|
664 |
} |
b92021b09
|
665 666 667 |
mod->unres = alloc_symbol(symname, ELF_ST_BIND(sym->st_info) == STB_WEAK, mod->unres); |
1da177e4c
|
668 669 670 |
break; default: /* All exported symbols */ |
d62c47652
|
671 |
if (strstarts(symname, "__ksymtab_")) { |
b2c5cdcfd
|
672 |
sym_add_exported(symname + strlen("__ksymtab_"), mod, |
bd5cbcedf
|
673 |
export); |
1da177e4c
|
674 |
} |
b2c5cdcfd
|
675 |
if (strcmp(symname, "init_module") == 0) |
1da177e4c
|
676 |
mod->has_init = 1; |
b2c5cdcfd
|
677 |
if (strcmp(symname, "cleanup_module") == 0) |
1da177e4c
|
678 679 680 681 |
mod->has_cleanup = 1; break; } } |
5c3ead8c7
|
682 683 684 |
/** * Parse tag=value strings from .modinfo section **/ |
1da177e4c
|
685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 |
static char *next_string(char *string, unsigned long *secsize) { /* Skip non-zero chars */ while (string[0]) { string++; if ((*secsize)-- <= 1) return NULL; } /* Skip any zero padding. */ while (!string[0]) { string++; if ((*secsize)-- <= 1) return NULL; } return string; } |
bca2ccee4
|
702 703 |
static char *get_next_modinfo(struct elf_info *info, const char *tag, char *prev) |
1da177e4c
|
704 705 706 |
{ char *p; unsigned int taglen = strlen(tag); |
bca2ccee4
|
707 708 |
char *modinfo = info->modinfo; unsigned long size = info->modinfo_len; |
1da177e4c
|
709 |
|
bca2ccee4
|
710 711 712 |
if (prev) { size -= prev - modinfo; modinfo = next_string(prev, &size); |
b817f6fef
|
713 |
} |
1da177e4c
|
714 715 716 717 718 719 |
for (p = modinfo; p; p = next_string(p, &size)) { if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') return p + taglen + 1; } return NULL; } |
bca2ccee4
|
720 |
static char *get_modinfo(struct elf_info *info, const char *tag) |
b817f6fef
|
721 722 |
{ |
bca2ccee4
|
723 |
return get_next_modinfo(info, tag, NULL); |
b817f6fef
|
724 |
} |
93684d3b8
|
725 |
/** |
4c8fbca58
|
726 727 728 729 730 |
* Test if string s ends in string sub * return 0 if match **/ static int strrcmp(const char *s, const char *sub) { |
df578e7d8
|
731 |
int slen, sublen; |
62070fa42
|
732 |
|
4c8fbca58
|
733 734 |
if (!s || !sub) return 1; |
62070fa42
|
735 |
|
4c8fbca58
|
736 |
slen = strlen(s); |
df578e7d8
|
737 |
sublen = strlen(sub); |
62070fa42
|
738 |
|
4c8fbca58
|
739 740 |
if ((slen == 0) || (sublen == 0)) return 1; |
df578e7d8
|
741 742 |
if (sublen > slen) return 1; |
4c8fbca58
|
743 |
|
df578e7d8
|
744 |
return memcmp(s + slen - sublen, sub, sublen); |
4c8fbca58
|
745 |
} |
ff13f9269
|
746 747 |
static const char *sym_name(struct elf_info *elf, Elf_Sym *sym) { |
58fb0d4f2
|
748 749 750 |
if (sym) return elf->strtab + sym->st_name; else |
f666751a0
|
751 |
return "(unknown)"; |
ff13f9269
|
752 |
} |
10668220a
|
753 754 |
/* The pattern is an array of simple patterns. * "foo" will match an exact string equal to "foo" |
6c5bd235b
|
755 |
* "*foo" will match a string that ends with "foo" |
10668220a
|
756 |
* "foo*" will match a string that begins with "foo" |
09c20c032
|
757 |
* "*foo*" will match a string that contains "foo" |
10668220a
|
758 |
*/ |
5c7251384
|
759 |
static int match(const char *sym, const char * const pat[]) |
10668220a
|
760 761 762 763 764 |
{ const char *p; while (*pat) { p = *pat++; const char *endp = p + strlen(p) - 1; |
09c20c032
|
765 766 767 768 769 770 771 772 773 |
/* "*foo*" */ if (*p == '*' && *endp == '*') { char *here, *bare = strndup(p + 1, strlen(p) - 2); here = strstr(sym, bare); free(bare); if (here != NULL) return 1; } |
6c5bd235b
|
774 |
/* "*foo" */ |
09c20c032
|
775 |
else if (*p == '*') { |
6c5bd235b
|
776 777 778 |
if (strrcmp(sym, p + 1) == 0) return 1; } |
10668220a
|
779 |
/* "foo*" */ |
6c5bd235b
|
780 |
else if (*endp == '*') { |
10668220a
|
781 782 783 |
if (strncmp(sym, p, strlen(p) - 1) == 0) return 1; } |
10668220a
|
784 785 786 787 788 789 790 791 792 |
/* no wildcards */ else { if (strcmp(p, sym) == 0) return 1; } } /* no match */ return 0; } |
10668220a
|
793 |
/* sections that we do not want to do full section mismatch check on */ |
7a3ee7538
|
794 |
static const char *const section_white_list[] = |
4391ed6aa
|
795 796 797 |
{ ".comment*", ".debug*", |
4d10c223b
|
798 |
".cranges", /* sh64 */ |
1121584f5
|
799 |
".zdebug*", /* Compressed debug sections. */ |
739d875dd
|
800 |
".GCC.command.line", /* record-gcc-switches */ |
4391ed6aa
|
801 802 803 804 805 806 |
".mdebug*", /* alpha, score, mips etc. */ ".pdr", /* alpha, score, mips etc. */ ".stab*", ".note*", ".got*", ".toc*", |
af42e970b
|
807 808 |
".xt.prop", /* xtensa */ ".xt.lit", /* xtensa */ |
f2e207f32
|
809 810 |
".arcextmap*", /* arc */ ".gnu.linkonce.arcext*", /* arc : modules */ |
d1189c63e
|
811 812 |
".cmem*", /* EZchip */ ".fmt_slot*", /* EZchip */ |
ef178f923
|
813 |
".gnu.lto*", |
e390f9a96
|
814 |
".discard.*", |
4391ed6aa
|
815 816 |
NULL }; |
10668220a
|
817 |
|
e241a6303
|
818 |
/* |
b614a697d
|
819 |
* This is used to find sections missing the SHF_ALLOC flag. |
e241a6303
|
820 |
* The cause of this is often a section specified in assembler |
b614a697d
|
821 |
* without "ax" / "aw". |
e241a6303
|
822 |
*/ |
b614a697d
|
823 |
static void check_section(const char *modname, struct elf_info *elf, |
bb66fc671
|
824 |
Elf_Shdr *sechdr) |
e241a6303
|
825 |
{ |
b614a697d
|
826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 |
const char *sec = sech_name(elf, sechdr); if (sechdr->sh_type == SHT_PROGBITS && !(sechdr->sh_flags & SHF_ALLOC) && !match(sec, section_white_list)) { warn("%s (%s): unexpected non-allocatable section. " "Did you forget to use \"ax\"/\"aw\" in a .S file? " "Note that for example <linux/init.h> contains " "section definitions for use in .S files. ", modname, sec); |
e241a6303
|
841 |
} |
e241a6303
|
842 |
} |
eb8f68904
|
843 |
#define ALL_INIT_DATA_SECTIONS \ |
a0d8f8037
|
844 845 |
".init.setup", ".init.rodata", ".meminit.rodata", \ ".init.data", ".meminit.data" |
eb8f68904
|
846 |
#define ALL_EXIT_DATA_SECTIONS \ |
a0d8f8037
|
847 |
".exit.data", ".memexit.data" |
10668220a
|
848 |
|
eb8f68904
|
849 |
#define ALL_INIT_TEXT_SECTIONS \ |
a0d8f8037
|
850 |
".init.text", ".meminit.text" |
eb8f68904
|
851 |
#define ALL_EXIT_TEXT_SECTIONS \ |
a0d8f8037
|
852 |
".exit.text", ".memexit.text" |
10668220a
|
853 |
|
bb15d8db7
|
854 |
#define ALL_PCI_INIT_SECTIONS \ |
a0d8f8037
|
855 856 857 |
".pci_fixup_early", ".pci_fixup_header", ".pci_fixup_final", \ ".pci_fixup_enable", ".pci_fixup_resume", \ ".pci_fixup_resume_early", ".pci_fixup_suspend" |
bb15d8db7
|
858 |
|
e24f66288
|
859 860 |
#define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS #define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS |
4a31a229f
|
861 862 863 |
#define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS |
10668220a
|
864 |
|
a0d8f8037
|
865 |
#define DATA_SECTIONS ".data", ".data.rel" |
157d1972d
|
866 |
#define TEXT_SECTIONS ".text", ".text.unlikely", ".sched.text", \ |
6727ad9e2
|
867 |
".kprobes.text", ".cpuidle.text" |
52dc0595d
|
868 |
#define OTHER_TEXT_SECTIONS ".ref.text", ".head.text", ".spinlock.text", \ |
673c2c34f
|
869 870 |
".fixup", ".entry.text", ".exception.text", ".text.*", \ ".coldtext" |
10668220a
|
871 |
|
fd6c3a8dc
|
872 |
#define INIT_SECTIONS ".init.*" |
fd6c3a8dc
|
873 |
#define MEM_INIT_SECTIONS ".meminit.*" |
eb8f68904
|
874 |
|
fd6c3a8dc
|
875 |
#define EXIT_SECTIONS ".exit.*" |
fd6c3a8dc
|
876 |
#define MEM_EXIT_SECTIONS ".memexit.*" |
eb8f68904
|
877 |
|
52dc0595d
|
878 879 |
#define ALL_TEXT_SECTIONS ALL_INIT_TEXT_SECTIONS, ALL_EXIT_TEXT_SECTIONS, \ TEXT_SECTIONS, OTHER_TEXT_SECTIONS |
6c5bd235b
|
880 |
/* init data sections */ |
7a3ee7538
|
881 882 |
static const char *const init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL }; |
6c5bd235b
|
883 884 |
/* all init sections */ |
7a3ee7538
|
885 |
static const char *const init_sections[] = { ALL_INIT_SECTIONS, NULL }; |
6c5bd235b
|
886 887 |
/* All init and exit sections (code + data) */ |
7a3ee7538
|
888 |
static const char *const init_exit_sections[] = |
eb8f68904
|
889 |
{ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL }; |
6c5bd235b
|
890 |
|
4a3893d06
|
891 892 |
/* all text sections */ static const char *const text_sections[] = { ALL_TEXT_SECTIONS, NULL }; |
6c5bd235b
|
893 |
/* data section */ |
7a3ee7538
|
894 |
static const char *const data_sections[] = { DATA_SECTIONS, NULL }; |
6c5bd235b
|
895 |
|
6c5bd235b
|
896 897 |
/* symbols in .data that may refer to init/exit sections */ |
af92a82d0
|
898 899 900 901 902 903 904 905 906 |
#define DEFAULT_SYMBOL_WHITE_LIST \ "*driver", \ "*_template", /* scsi uses *_template a lot */ \ "*_timer", /* arm uses ops structures named _timer a lot */ \ "*_sht", /* scsi also used *_sht to some extent */ \ "*_ops", \ "*_probe", \ "*_probe_one", \ "*_console" |
6c5bd235b
|
907 |
|
7a3ee7538
|
908 909 |
static const char *const head_sections[] = { ".head.text*", NULL }; static const char *const linker_symbols[] = |
6c5bd235b
|
910 |
{ "__init_begin", "_sinittext", "_einittext", NULL }; |
4a3893d06
|
911 |
static const char *const optim_symbols[] = { "*.constprop.*", NULL }; |
6c5bd235b
|
912 |
|
588ccd732
|
913 |
enum mismatch { |
bbd3f4fb8
|
914 915 916 917 918 919 920 921 |
TEXT_TO_ANY_INIT, DATA_TO_ANY_INIT, TEXT_TO_ANY_EXIT, DATA_TO_ANY_EXIT, XXXINIT_TO_SOME_INIT, XXXEXIT_TO_SOME_EXIT, ANY_INIT_TO_ANY_EXIT, ANY_EXIT_TO_ANY_INIT, |
588ccd732
|
922 |
EXPORT_TO_INIT_EXIT, |
52dc0595d
|
923 |
EXTABLE_TO_NON_TEXT, |
588ccd732
|
924 |
}; |
e5d8f59a5
|
925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 |
/** * Describe how to match sections on different criterias: * * @fromsec: Array of sections to be matched. * * @bad_tosec: Relocations applied to a section in @fromsec to a section in * this array is forbidden (black-list). Can be empty. * * @good_tosec: Relocations applied to a section in @fromsec must be * targetting sections in this array (white-list). Can be empty. * * @mismatch: Type of mismatch. * * @symbol_white_list: Do not match a relocation to a symbol in this list * even if it is targetting a section in @bad_to_sec. * * @handler: Specific handler to call when a match is found. If NULL, * default_mismatch_handler() will be called. * */ |
10668220a
|
945 946 |
struct sectioncheck { const char *fromsec[20]; |
050e57fd5
|
947 948 |
const char *bad_tosec[20]; const char *good_tosec[20]; |
588ccd732
|
949 |
enum mismatch mismatch; |
af92a82d0
|
950 |
const char *symbol_white_list[20]; |
644e8f14c
|
951 952 953 |
void (*handler)(const char *modname, struct elf_info *elf, const struct sectioncheck* const mismatch, Elf_Rela *r, Elf_Sym *sym, const char *fromsec); |
10668220a
|
954 |
}; |
52dc0595d
|
955 956 957 958 |
static void extable_mismatch_handler(const char *modname, struct elf_info *elf, const struct sectioncheck* const mismatch, Elf_Rela *r, Elf_Sym *sym, const char *fromsec); |
7a3ee7538
|
959 |
static const struct sectioncheck sectioncheck[] = { |
10668220a
|
960 961 962 963 |
/* Do not reference init/exit code/data from * normal code and data */ { |
588ccd732
|
964 |
.fromsec = { TEXT_SECTIONS, NULL }, |
050e57fd5
|
965 |
.bad_tosec = { ALL_INIT_SECTIONS, NULL }, |
bbd3f4fb8
|
966 |
.mismatch = TEXT_TO_ANY_INIT, |
af92a82d0
|
967 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd732
|
968 969 970 |
}, { .fromsec = { DATA_SECTIONS, NULL }, |
050e57fd5
|
971 |
.bad_tosec = { ALL_XXXINIT_SECTIONS, NULL }, |
bbd3f4fb8
|
972 |
.mismatch = DATA_TO_ANY_INIT, |
af92a82d0
|
973 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd732
|
974 975 |
}, { |
0db252452
|
976 |
.fromsec = { DATA_SECTIONS, NULL }, |
050e57fd5
|
977 |
.bad_tosec = { INIT_SECTIONS, NULL }, |
0db252452
|
978 979 980 981 982 983 984 |
.mismatch = DATA_TO_ANY_INIT, .symbol_white_list = { "*_template", "*_timer", "*_sht", "*_ops", "*_probe", "*_probe_one", "*_console", NULL }, }, { |
588ccd732
|
985 |
.fromsec = { TEXT_SECTIONS, NULL }, |
050e57fd5
|
986 |
.bad_tosec = { ALL_EXIT_SECTIONS, NULL }, |
bbd3f4fb8
|
987 |
.mismatch = TEXT_TO_ANY_EXIT, |
af92a82d0
|
988 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
588ccd732
|
989 990 991 |
}, { .fromsec = { DATA_SECTIONS, NULL }, |
050e57fd5
|
992 |
.bad_tosec = { ALL_EXIT_SECTIONS, NULL }, |
bbd3f4fb8
|
993 |
.mismatch = DATA_TO_ANY_EXIT, |
af92a82d0
|
994 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f68904
|
995 |
}, |
e24f66288
|
996 |
/* Do not reference init code/data from meminit code/data */ |
eb8f68904
|
997 |
{ |
4a31a229f
|
998 |
.fromsec = { ALL_XXXINIT_SECTIONS, NULL }, |
050e57fd5
|
999 |
.bad_tosec = { INIT_SECTIONS, NULL }, |
bbd3f4fb8
|
1000 |
.mismatch = XXXINIT_TO_SOME_INIT, |
af92a82d0
|
1001 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
eb8f68904
|
1002 |
}, |
e24f66288
|
1003 |
/* Do not reference exit code/data from memexit code/data */ |
eb8f68904
|
1004 |
{ |
4a31a229f
|
1005 |
.fromsec = { ALL_XXXEXIT_SECTIONS, NULL }, |
050e57fd5
|
1006 |
.bad_tosec = { EXIT_SECTIONS, NULL }, |
bbd3f4fb8
|
1007 |
.mismatch = XXXEXIT_TO_SOME_EXIT, |
af92a82d0
|
1008 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220a
|
1009 1010 1011 |
}, /* Do not use exit code/data from init code */ { |
eb8f68904
|
1012 |
.fromsec = { ALL_INIT_SECTIONS, NULL }, |
050e57fd5
|
1013 |
.bad_tosec = { ALL_EXIT_SECTIONS, NULL }, |
bbd3f4fb8
|
1014 |
.mismatch = ANY_INIT_TO_ANY_EXIT, |
af92a82d0
|
1015 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220a
|
1016 1017 1018 |
}, /* Do not use init code/data from exit code */ { |
eb8f68904
|
1019 |
.fromsec = { ALL_EXIT_SECTIONS, NULL }, |
050e57fd5
|
1020 |
.bad_tosec = { ALL_INIT_SECTIONS, NULL }, |
bbd3f4fb8
|
1021 |
.mismatch = ANY_EXIT_TO_ANY_INIT, |
af92a82d0
|
1022 |
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
10668220a
|
1023 |
}, |
bb15d8db7
|
1024 1025 |
{ .fromsec = { ALL_PCI_INIT_SECTIONS, NULL }, |
050e57fd5
|
1026 |
.bad_tosec = { INIT_SECTIONS, NULL }, |
bb15d8db7
|
1027 1028 1029 |
.mismatch = ANY_INIT_TO_ANY_EXIT, .symbol_white_list = { NULL }, }, |
10668220a
|
1030 1031 1032 |
/* Do not export init/exit functions or data */ { .fromsec = { "__ksymtab*", NULL }, |
050e57fd5
|
1033 |
.bad_tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL }, |
af92a82d0
|
1034 1035 |
.mismatch = EXPORT_TO_INIT_EXIT, .symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL }, |
52dc0595d
|
1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 |
}, { .fromsec = { "__ex_table", NULL }, /* If you're adding any new black-listed sections in here, consider * adding a special 'printer' for them in scripts/check_extable. */ .bad_tosec = { ".altinstr_replacement", NULL }, .good_tosec = {ALL_TEXT_SECTIONS , NULL}, .mismatch = EXTABLE_TO_NON_TEXT, .handler = extable_mismatch_handler, |
10668220a
|
1046 1047 |
} }; |
0d2a636ee
|
1048 1049 |
static const struct sectioncheck *section_mismatch( const char *fromsec, const char *tosec) |
10668220a
|
1050 1051 1052 1053 |
{ int i; int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck); const struct sectioncheck *check = §ioncheck[0]; |
c5c3439af
|
1054 1055 1056 |
/* * The target section could be the SHT_NUL section when we're * handling relocations to un-resolved symbols, trying to match it |
739d875dd
|
1057 1058 |
* doesn't make much sense and causes build failures on parisc * architectures. |
c5c3439af
|
1059 1060 1061 |
*/ if (*tosec == '\0') return NULL; |
10668220a
|
1062 |
for (i = 0; i < elems; i++) { |
050e57fd5
|
1063 1064 1065 1066 1067 1068 |
if (match(fromsec, check->fromsec)) { if (check->bad_tosec[0] && match(tosec, check->bad_tosec)) return check; if (check->good_tosec[0] && !match(tosec, check->good_tosec)) return check; } |
10668220a
|
1069 1070 |
check++; } |
0d2a636ee
|
1071 |
return NULL; |
10668220a
|
1072 |
} |
4c8fbca58
|
1073 1074 |
/** * Whitelist to allow certain references to pass with no warning. |
0e0d314e6
|
1075 |
* |
4c8fbca58
|
1076 1077 1078 1079 1080 1081 1082 |
* Pattern 1: * If a module parameter is declared __initdata and permissions=0 * then this is legal despite the warning generated. * We cannot see value of permissions here, so just ignore * this pattern. * The pattern is identified by: * tosec = .init.data |
9209aed07
|
1083 |
* fromsec = .data* |
4c8fbca58
|
1084 |
* atsym =__param* |
62070fa42
|
1085 |
* |
6a841528d
|
1086 1087 1088 1089 1090 1091 1092 |
* Pattern 1a: * module_param_call() ops can refer to __init set function if permissions=0 * The pattern is identified by: * tosec = .init.text * fromsec = .data* * atsym = __param_ops_* * |
4c8fbca58
|
1093 |
* Pattern 2: |
72ee59b57
|
1094 |
* Many drivers utilise a *driver container with references to |
4c8fbca58
|
1095 |
* add, remove, probe functions etc. |
4c8fbca58
|
1096 |
* the pattern is identified by: |
83cda2bb3
|
1097 1098 |
* tosec = init or exit section * fromsec = data section |
df578e7d8
|
1099 1100 |
* atsym = *driver, *_template, *_sht, *_ops, *_probe, * *probe_one, *_console, *_timer |
ee6a8545a
|
1101 1102 |
* * Pattern 3: |
c993971f4
|
1103 |
* Whitelist all references from .head.text to any init section |
9bf8cb9b7
|
1104 |
* |
1d8af559f
|
1105 |
* Pattern 4: |
ee6a8545a
|
1106 1107 1108 1109 1110 1111 1112 |
* Some symbols belong to init section but still it is ok to reference * these from non-init sections as these symbols don't have any memory * allocated for them and symbol address and value are same. So even * if init section is freed, its ok to reference those symbols. * For ex. symbols marking the init section boundaries. * This pattern is identified by * refsymname = __init_begin, _sinittext, _einittext |
9bf8cb9b7
|
1113 |
* |
4a3893d06
|
1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 |
* Pattern 5: * GCC may optimize static inlines when fed constant arg(s) resulting * in functions like cpumask_empty() -- generating an associated symbol * cpumask_empty.constprop.3 that appears in the audit. If the const that * is passed in comes from __init, like say nmi_ipi_mask, we get a * meaningless section warning. May need to add isra symbols too... * This pattern is identified by * tosec = init section * fromsec = text section * refsymname = *.constprop.* * |
4c8fbca58
|
1125 |
**/ |
af92a82d0
|
1126 1127 |
static int secref_whitelist(const struct sectioncheck *mismatch, const char *fromsec, const char *fromsym, |
58fb0d4f2
|
1128 |
const char *tosec, const char *tosym) |
4c8fbca58
|
1129 |
{ |
4c8fbca58
|
1130 |
/* Check for pattern 1 */ |
6c5bd235b
|
1131 1132 |
if (match(tosec, init_data_sections) && match(fromsec, data_sections) && |
d62c47652
|
1133 |
strstarts(fromsym, "__param")) |
58fb0d4f2
|
1134 |
return 0; |
4c8fbca58
|
1135 |
|
6a841528d
|
1136 1137 1138 |
/* Check for pattern 1a */ if (strcmp(tosec, ".init.text") == 0 && match(fromsec, data_sections) && |
d62c47652
|
1139 |
strstarts(fromsym, "__param_ops_")) |
6a841528d
|
1140 |
return 0; |
4c8fbca58
|
1141 |
/* Check for pattern 2 */ |
6c5bd235b
|
1142 1143 |
if (match(tosec, init_exit_sections) && match(fromsec, data_sections) && |
af92a82d0
|
1144 |
match(fromsym, mismatch->symbol_white_list)) |
58fb0d4f2
|
1145 |
return 0; |
4c8fbca58
|
1146 |
|
9bf8cb9b7
|
1147 |
/* Check for pattern 3 */ |
6c5bd235b
|
1148 1149 |
if (match(fromsec, head_sections) && match(tosec, init_sections)) |
58fb0d4f2
|
1150 |
return 0; |
9bf8cb9b7
|
1151 |
|
1d8af559f
|
1152 |
/* Check for pattern 4 */ |
58fb0d4f2
|
1153 1154 |
if (match(tosym, linker_symbols)) return 0; |
9bf8cb9b7
|
1155 |
|
4a3893d06
|
1156 1157 1158 1159 1160 |
/* Check for pattern 5 */ if (match(fromsec, text_sections) && match(tosec, init_sections) && match(fromsym, optim_symbols)) return 0; |
58fb0d4f2
|
1161 |
return 1; |
4c8fbca58
|
1162 |
} |
b6293e6c9
|
1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 |
static inline int is_arm_mapping_symbol(const char *str) { return str[0] == '$' && strchr("axtd", str[1]) && (str[2] == '\0' || str[2] == '.'); } /* * If there's no name there, ignore it; likewise, ignore it if it's * one of the magic symbols emitted used by current ARM tools. * * Otherwise if find_symbols_between() returns those symbols, they'll * fail the whitelist tests and cause lots of false alarms ... fixable * only by merging __exit and __init sections into __text, bloating * the kernel (which is especially evil on embedded platforms). */ static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym) { const char *name = elf->strtab + sym->st_name; if (!name || !strlen(name)) return 0; return !is_arm_mapping_symbol(name); } |
4c8fbca58
|
1186 |
/** |
93684d3b8
|
1187 1188 1189 1190 1191 1192 |
* Find symbol based on relocation record info. * In some cases the symbol supplied is a valid symbol so * return refsym. If st_name != 0 we assume this is a valid symbol. * In other cases the symbol needs to be looked up in the symbol table * based on section and address. * **/ |
9ad21c3f3
|
1193 |
static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr, |
93684d3b8
|
1194 1195 1196 |
Elf_Sym *relsym) { Elf_Sym *sym; |
9ad21c3f3
|
1197 1198 1199 |
Elf_Sym *near = NULL; Elf64_Sword distance = 20; Elf64_Sword d; |
1ce53adf1
|
1200 |
unsigned int relsym_secindex; |
93684d3b8
|
1201 1202 1203 |
if (relsym->st_name != 0) return relsym; |
1ce53adf1
|
1204 1205 |
relsym_secindex = get_secindex(elf, relsym); |
93684d3b8
|
1206 |
for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { |
1ce53adf1
|
1207 |
if (get_secindex(elf, sym) != relsym_secindex) |
93684d3b8
|
1208 |
continue; |
ae4ac1232
|
1209 1210 |
if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) continue; |
b6293e6c9
|
1211 1212 |
if (!is_valid_name(elf, sym)) continue; |
93684d3b8
|
1213 1214 |
if (sym->st_value == addr) return sym; |
9ad21c3f3
|
1215 1216 1217 1218 1219 1220 1221 1222 |
/* Find a symbol nearby - addr are maybe negative */ d = sym->st_value - addr; if (d < 0) d = addr - sym->st_value; if (d < distance) { distance = d; near = sym; } |
93684d3b8
|
1223 |
} |
9ad21c3f3
|
1224 1225 1226 1227 1228 |
/* We need a close match */ if (distance < 20) return near; else return NULL; |
93684d3b8
|
1229 |
} |
b39927cf4
|
1230 |
/* |
43c74d179
|
1231 1232 1233 1234 |
* Find symbols before or equal addr and after addr - in the section sec. * If we find two symbols with equal offset prefer one with a valid name. * The ELF format may have a better way to detect what type of symbol * it is, but this works for now. |
b39927cf4
|
1235 |
**/ |
157c23c80
|
1236 1237 |
static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr, const char *sec) |
b39927cf4
|
1238 1239 |
{ Elf_Sym *sym; |
157c23c80
|
1240 |
Elf_Sym *near = NULL; |
157c23c80
|
1241 |
Elf_Addr distance = ~0; |
62070fa42
|
1242 |
|
b39927cf4
|
1243 1244 |
for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) { const char *symsec; |
1ce53adf1
|
1245 |
if (is_shndx_special(sym->st_shndx)) |
b39927cf4
|
1246 |
continue; |
1ce53adf1
|
1247 |
symsec = sec_name(elf, get_secindex(elf, sym)); |
b39927cf4
|
1248 1249 |
if (strcmp(symsec, sec) != 0) continue; |
da68d61f8
|
1250 1251 |
if (!is_valid_name(elf, sym)) continue; |
b39927cf4
|
1252 |
if (sym->st_value <= addr) { |
157c23c80
|
1253 1254 1255 1256 1257 |
if ((addr - sym->st_value) < distance) { distance = addr - sym->st_value; near = sym; } else if ((addr - sym->st_value) == distance) { near = sym; |
43c74d179
|
1258 |
} |
b39927cf4
|
1259 1260 |
} } |
157c23c80
|
1261 |
return near; |
b39927cf4
|
1262 |
} |
58fb0d4f2
|
1263 |
/* |
588ccd732
|
1264 1265 |
* Convert a section name to the function/data attribute * .init.text => __init |
588ccd732
|
1266 1267 |
* .memexitconst => __memconst * etc. |
cbcf14a94
|
1268 1269 1270 |
* * The memory of returned value has been allocated on a heap. The user of this * method should free it after usage. |
588ccd732
|
1271 1272 1273 1274 |
*/ static char *sec2annotation(const char *s) { if (match(s, init_exit_sections)) { |
1f3aa9002
|
1275 |
char *p = NOFAIL(malloc(20)); |
588ccd732
|
1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 |
char *r = p; *p++ = '_'; *p++ = '_'; if (*s == '.') s++; while (*s && *s != '.') *p++ = *s++; *p = '\0'; if (*s == '.') s++; if (strstr(s, "rodata") != NULL) strcat(p, "const "); else if (strstr(s, "data") != NULL) strcat(p, "data "); else strcat(p, " "); |
cbcf14a94
|
1293 |
return r; |
588ccd732
|
1294 |
} else { |
1f3aa9002
|
1295 |
return NOFAIL(strdup("")); |
588ccd732
|
1296 1297 1298 1299 1300 1301 1302 1303 |
} } static int is_function(Elf_Sym *sym) { if (sym) return ELF_ST_TYPE(sym->st_info) == STT_FUNC; else |
f666751a0
|
1304 |
return -1; |
588ccd732
|
1305 |
} |
00759c0ea
|
1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 |
static void print_section_list(const char * const list[20]) { const char *const *s = list; while (*s) { fprintf(stderr, "%s", *s); s++; if (*s) fprintf(stderr, ", "); } fprintf(stderr, " "); } |
356ad5381
|
1319 1320 1321 1322 1323 1324 1325 1326 |
static inline void get_pretty_name(int is_func, const char** name, const char** name_p) { switch (is_func) { case 0: *name = "variable"; *name_p = ""; break; case 1: *name = "function"; *name_p = "()"; break; default: *name = "(unknown reference)"; *name_p = ""; break; } } |
588ccd732
|
1327 |
/* |
b39927cf4
|
1328 1329 |
* Print a warning about a section mismatch. * Try to find symbols near it so user can find it. |
4c8fbca58
|
1330 |
* Check whitelist before warning - it may be a false positive. |
58fb0d4f2
|
1331 |
*/ |
0d2a636ee
|
1332 1333 |
static void report_sec_mismatch(const char *modname, const struct sectioncheck *mismatch, |
bb66fc671
|
1334 1335 1336 1337 1338 1339 |
const char *fromsec, unsigned long long fromaddr, const char *fromsym, int from_is_func, const char *tosec, const char *tosym, int to_is_func) |
588ccd732
|
1340 1341 1342 |
{ const char *from, *from_p; const char *to, *to_p; |
37ed19d5c
|
1343 1344 |
char *prl_from; char *prl_to; |
f666751a0
|
1345 |
|
e5f95c8b7
|
1346 1347 1348 |
sec_mismatch_count++; if (!sec_mismatch_verbose) return; |
356ad5381
|
1349 1350 |
get_pretty_name(from_is_func, &from, &from_p); get_pretty_name(to_is_func, &to, &to_p); |
7c0ac495e
|
1351 1352 1353 1354 1355 |
warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s " "to the %s %s:%s%s ", modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec, tosym, to_p); |
588ccd732
|
1356 |
|
0d2a636ee
|
1357 |
switch (mismatch->mismatch) { |
bbd3f4fb8
|
1358 |
case TEXT_TO_ANY_INIT: |
37ed19d5c
|
1359 1360 |
prl_from = sec2annotation(fromsec); prl_to = sec2annotation(tosec); |
588ccd732
|
1361 |
fprintf(stderr, |
f666751a0
|
1362 1363 |
"The function %s%s() references " |
588ccd732
|
1364 1365 1366 1367 1368 1369 |
"the %s %s%s%s. " "This is often because %s lacks a %s " "annotation or the annotation of %s is wrong. ", |
37ed19d5c
|
1370 1371 1372 1373 1374 |
prl_from, fromsym, to, prl_to, tosym, to_p, fromsym, prl_to, tosym); free(prl_from); free(prl_to); |
588ccd732
|
1375 |
break; |
bbd3f4fb8
|
1376 |
case DATA_TO_ANY_INIT: { |
37ed19d5c
|
1377 |
prl_to = sec2annotation(tosec); |
588ccd732
|
1378 1379 1380 1381 1382 1383 1384 |
fprintf(stderr, "The variable %s references " "the %s %s%s%s " "If the reference is valid then annotate the " |
8b8b76c04
|
1385 |
"variable with __init* or __refdata (see linux/init.h) " |
588ccd732
|
1386 1387 |
"or name the variable: ", |
37ed19d5c
|
1388 |
fromsym, to, prl_to, tosym, to_p); |
00759c0ea
|
1389 |
print_section_list(mismatch->symbol_white_list); |
37ed19d5c
|
1390 |
free(prl_to); |
588ccd732
|
1391 |
break; |
58fb0d4f2
|
1392 |
} |
bbd3f4fb8
|
1393 |
case TEXT_TO_ANY_EXIT: |
37ed19d5c
|
1394 |
prl_to = sec2annotation(tosec); |
588ccd732
|
1395 1396 1397 1398 1399 1400 1401 |
fprintf(stderr, "The function %s() references a %s in an exit section. " "Often the %s %s%s has valid usage outside the exit section " "and the fix is to remove the %sannotation of %s. ", |
37ed19d5c
|
1402 1403 |
fromsym, to, to, tosym, to_p, prl_to, tosym); free(prl_to); |
588ccd732
|
1404 |
break; |
bbd3f4fb8
|
1405 |
case DATA_TO_ANY_EXIT: { |
37ed19d5c
|
1406 |
prl_to = sec2annotation(tosec); |
588ccd732
|
1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 |
fprintf(stderr, "The variable %s references " "the %s %s%s%s " "If the reference is valid then annotate the " "variable with __exit* (see linux/init.h) or " "name the variable: ", |
37ed19d5c
|
1417 |
fromsym, to, prl_to, tosym, to_p); |
00759c0ea
|
1418 |
print_section_list(mismatch->symbol_white_list); |
37ed19d5c
|
1419 |
free(prl_to); |
588ccd732
|
1420 1421 |
break; } |
bbd3f4fb8
|
1422 1423 |
case XXXINIT_TO_SOME_INIT: case XXXEXIT_TO_SOME_EXIT: |
37ed19d5c
|
1424 1425 |
prl_from = sec2annotation(fromsec); prl_to = sec2annotation(tosec); |
588ccd732
|
1426 1427 1428 1429 1430 1431 1432 1433 1434 |
fprintf(stderr, "The %s %s%s%s references " "a %s %s%s%s. " "If %s is only used by %s then " "annotate %s with a matching annotation. ", |
37ed19d5c
|
1435 1436 |
from, prl_from, fromsym, from_p, to, prl_to, tosym, to_p, |
b1d2675a6
|
1437 |
tosym, fromsym, tosym); |
37ed19d5c
|
1438 1439 |
free(prl_from); free(prl_to); |
588ccd732
|
1440 |
break; |
bbd3f4fb8
|
1441 |
case ANY_INIT_TO_ANY_EXIT: |
37ed19d5c
|
1442 1443 |
prl_from = sec2annotation(fromsec); prl_to = sec2annotation(tosec); |
588ccd732
|
1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 |
fprintf(stderr, "The %s %s%s%s references " "a %s %s%s%s. " "This is often seen when error handling " "in the init function " "uses functionality in the exit path. " "The fix is often to remove the %sannotation of " "%s%s so it may be used outside an exit section. ", |
37ed19d5c
|
1458 1459 |
from, prl_from, fromsym, from_p, to, prl_to, tosym, to_p, |
5003bab82
|
1460 |
prl_to, tosym, to_p); |
37ed19d5c
|
1461 1462 |
free(prl_from); free(prl_to); |
588ccd732
|
1463 |
break; |
bbd3f4fb8
|
1464 |
case ANY_EXIT_TO_ANY_INIT: |
37ed19d5c
|
1465 1466 |
prl_from = sec2annotation(fromsec); prl_to = sec2annotation(tosec); |
588ccd732
|
1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 |
fprintf(stderr, "The %s %s%s%s references " "a %s %s%s%s. " "This is often seen when error handling " "in the exit function " "uses functionality in the init path. " "The fix is often to remove the %sannotation of " "%s%s so it may be used outside an init section. ", |
37ed19d5c
|
1481 1482 1483 1484 1485 |
from, prl_from, fromsym, from_p, to, prl_to, tosym, to_p, prl_to, tosym, to_p); free(prl_from); free(prl_to); |
588ccd732
|
1486 1487 |
break; case EXPORT_TO_INIT_EXIT: |
37ed19d5c
|
1488 |
prl_to = sec2annotation(tosec); |
588ccd732
|
1489 1490 1491 1492 1493 1494 |
fprintf(stderr, "The symbol %s is exported and annotated %s " "Fix this by removing the %sannotation of %s " "or drop the export. ", |
37ed19d5c
|
1495 1496 |
tosym, prl_to, prl_to, tosym); free(prl_to); |
588ccd732
|
1497 |
break; |
52dc0595d
|
1498 1499 1500 1501 |
case EXTABLE_TO_NON_TEXT: fatal("There's a special handler for this mismatch type, " "we should never get here."); break; |
588ccd732
|
1502 1503 1504 |
} fprintf(stderr, " "); |
58fb0d4f2
|
1505 |
} |
644e8f14c
|
1506 1507 1508 |
static void default_mismatch_handler(const char *modname, struct elf_info *elf, const struct sectioncheck* const mismatch, Elf_Rela *r, Elf_Sym *sym, const char *fromsec) |
58fb0d4f2
|
1509 1510 |
{ const char *tosec; |
644e8f14c
|
1511 1512 1513 1514 |
Elf_Sym *to; Elf_Sym *from; const char *tosym; const char *fromsym; |
58fb0d4f2
|
1515 |
|
644e8f14c
|
1516 1517 |
from = find_elf_symbol2(elf, r->r_offset, fromsec); fromsym = sym_name(elf, from); |
644e8f14c
|
1518 |
|
d62c47652
|
1519 |
if (strstarts(fromsym, "reference___initcall")) |
644e8f14c
|
1520 |
return; |
c7a65e064
|
1521 1522 1523 |
tosec = sec_name(elf, get_secindex(elf, sym)); to = find_elf_symbol(elf, r->r_addend, sym); tosym = sym_name(elf, to); |
644e8f14c
|
1524 1525 1526 1527 1528 1529 1530 1531 1532 |
/* check whitelist - we may ignore it */ if (secref_whitelist(mismatch, fromsec, fromsym, tosec, tosym)) { report_sec_mismatch(modname, mismatch, fromsec, r->r_offset, fromsym, is_function(from), tosec, tosym, is_function(to)); } } |
52dc0595d
|
1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 |
static int is_executable_section(struct elf_info* elf, unsigned int section_index) { if (section_index > elf->num_sections) fatal("section_index is outside elf->num_sections! "); return ((elf->sechdrs[section_index].sh_flags & SHF_EXECINSTR) == SHF_EXECINSTR); } /* * We rely on a gross hack in section_rel[a]() calling find_extable_entry_size() * to know the sizeof(struct exception_table_entry) for the target architecture. */ static unsigned int extable_entry_size = 0; |
e84048aa1
|
1547 |
static void find_extable_entry_size(const char* const sec, const Elf_Rela* r) |
52dc0595d
|
1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 |
{ /* * If we're currently checking the second relocation within __ex_table, * that relocation offset tells us the offsetof(struct * exception_table_entry, fixup) which is equal to sizeof(struct * exception_table_entry) divided by two. We use that to our advantage * since there's no portable way to get that size as every architecture * seems to go with different sized types. Not pretty but better than * hard-coding the size for every architecture.. */ |
e84048aa1
|
1558 |
if (!extable_entry_size) |
52dc0595d
|
1559 1560 |
extable_entry_size = r->r_offset * 2; } |
e84048aa1
|
1561 |
|
52dc0595d
|
1562 1563 |
static inline bool is_extable_fault_address(Elf_Rela *r) { |
d3df4de7e
|
1564 1565 1566 1567 1568 1569 |
/* * extable_entry_size is only discovered after we've handled the * _second_ relocation in __ex_table, so only abort when we're not * handling the first reloc and extable_entry_size is zero. */ if (r->r_offset && extable_entry_size == 0) |
52dc0595d
|
1570 1571 1572 1573 1574 1575 |
fatal("extable_entry size hasn't been discovered! "); return ((r->r_offset == 0) || (r->r_offset % extable_entry_size == 0)); } |
e84048aa1
|
1576 1577 |
#define is_second_extable_reloc(Start, Cur, Sec) \ (((Cur) == (Start) + 1) && (strcmp("__ex_table", (Sec)) == 0)) |
52dc0595d
|
1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 |
static void report_extable_warnings(const char* modname, struct elf_info* elf, const struct sectioncheck* const mismatch, Elf_Rela* r, Elf_Sym* sym, const char* fromsec, const char* tosec) { Elf_Sym* fromsym = find_elf_symbol2(elf, r->r_offset, fromsec); const char* fromsym_name = sym_name(elf, fromsym); Elf_Sym* tosym = find_elf_symbol(elf, r->r_addend, sym); const char* tosym_name = sym_name(elf, tosym); const char* from_pretty_name; const char* from_pretty_name_p; const char* to_pretty_name; const char* to_pretty_name_p; get_pretty_name(is_function(fromsym), &from_pretty_name, &from_pretty_name_p); get_pretty_name(is_function(tosym), &to_pretty_name, &to_pretty_name_p); warn("%s(%s+0x%lx): Section mismatch in reference" " from the %s %s%s to the %s %s:%s%s ", modname, fromsec, (long)r->r_offset, from_pretty_name, fromsym_name, from_pretty_name_p, to_pretty_name, tosec, tosym_name, to_pretty_name_p); if (!match(tosec, mismatch->bad_tosec) && is_executable_section(elf, get_secindex(elf, sym))) fprintf(stderr, "The relocation at %s+0x%lx references " "section \"%s\" which is not in the list of " "authorized sections. If you're adding a new section " "and/or if this reference is valid, add \"%s\" to the " "list of authorized sections to jump to on fault. " "This can be achieved by adding \"%s\" to " "OTHER_TEXT_SECTIONS in scripts/mod/modpost.c. ", fromsec, (long)r->r_offset, tosec, tosec, tosec); } static void extable_mismatch_handler(const char* modname, struct elf_info *elf, const struct sectioncheck* const mismatch, Elf_Rela* r, Elf_Sym* sym, const char *fromsec) { const char* tosec = sec_name(elf, get_secindex(elf, sym)); sec_mismatch_count++; if (sec_mismatch_verbose) report_extable_warnings(modname, elf, mismatch, r, sym, fromsec, tosec); if (match(tosec, mismatch->bad_tosec)) fatal("The relocation at %s+0x%lx references " "section \"%s\" which is black-listed. " "Something is seriously wrong and should be fixed. " "You might get more information about where this is " "coming from by using scripts/check_extable.sh %s ", fromsec, (long)r->r_offset, tosec, modname); else if (!is_executable_section(elf, get_secindex(elf, sym))) { if (is_extable_fault_address(r)) fatal("The relocation at %s+0x%lx references " "section \"%s\" which is not executable, IOW " "it is not possible for the kernel to fault " "at that address. Something is seriously wrong " "and should be fixed. ", fromsec, (long)r->r_offset, tosec); else fatal("The relocation at %s+0x%lx references " "section \"%s\" which is not executable, IOW " "the kernel will fault if it ever tries to " "jump to it. Something is seriously wrong " "and should be fixed. ", fromsec, (long)r->r_offset, tosec); } } |
644e8f14c
|
1676 1677 1678 |
static void check_section_mismatch(const char *modname, struct elf_info *elf, Elf_Rela *r, Elf_Sym *sym, const char *fromsec) { |
0cad61d7a
|
1679 |
const char *tosec = sec_name(elf, get_secindex(elf, sym)); |
644e8f14c
|
1680 |
const struct sectioncheck *mismatch = section_mismatch(fromsec, tosec); |
0d2a636ee
|
1681 |
if (mismatch) { |
644e8f14c
|
1682 1683 1684 1685 1686 1687 |
if (mismatch->handler) mismatch->handler(modname, elf, mismatch, r, sym, fromsec); else default_mismatch_handler(modname, elf, mismatch, r, sym, fromsec); |
b39927cf4
|
1688 1689 |
} } |
ae4ac1232
|
1690 |
static unsigned int *reloc_location(struct elf_info *elf, |
5b24c0715
|
1691 |
Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac1232
|
1692 1693 |
{ Elf_Shdr *sechdrs = elf->sechdrs; |
6845756b2
|
1694 |
int section = sechdr->sh_info; |
ae4ac1232
|
1695 1696 |
return (void *)elf->hdr + sechdrs[section].sh_offset + |
731ece41f
|
1697 |
r->r_offset; |
ae4ac1232
|
1698 |
} |
5b24c0715
|
1699 |
static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac1232
|
1700 1701 |
{ unsigned int r_typ = ELF_R_TYPE(r->r_info); |
5b24c0715
|
1702 |
unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac1232
|
1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 |
switch (r_typ) { case R_386_32: r->r_addend = TO_NATIVE(*location); break; case R_386_PC32: r->r_addend = TO_NATIVE(*location) + 4; /* For CONFIG_RELOCATABLE=y */ if (elf->hdr->e_type == ET_EXEC) r->r_addend += r->r_offset; break; } return 0; } |
6e2e340b5
|
1717 1718 1719 1720 1721 1722 |
#ifndef R_ARM_CALL #define R_ARM_CALL 28 #endif #ifndef R_ARM_JUMP24 #define R_ARM_JUMP24 29 #endif |
c9698e5cd
|
1723 1724 1725 1726 1727 1728 1729 1730 1731 |
#ifndef R_ARM_THM_CALL #define R_ARM_THM_CALL 10 #endif #ifndef R_ARM_THM_JUMP24 #define R_ARM_THM_JUMP24 30 #endif #ifndef R_ARM_THM_JUMP19 #define R_ARM_THM_JUMP19 51 #endif |
5b24c0715
|
1732 |
static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
56a974fa2
|
1733 1734 1735 1736 1737 1738 |
{ unsigned int r_typ = ELF_R_TYPE(r->r_info); switch (r_typ) { case R_ARM_ABS32: /* From ARM ABI: (S + A) | T */ |
df578e7d8
|
1739 |
r->r_addend = (int)(long) |
bb66fc671
|
1740 |
(elf->symtab_start + ELF_R_SYM(r->r_info)); |
56a974fa2
|
1741 1742 |
break; case R_ARM_PC24: |
6e2e340b5
|
1743 1744 |
case R_ARM_CALL: case R_ARM_JUMP24: |
c9698e5cd
|
1745 1746 1747 |
case R_ARM_THM_CALL: case R_ARM_THM_JUMP24: case R_ARM_THM_JUMP19: |
56a974fa2
|
1748 |
/* From ARM ABI: ((S + A) | T) - P */ |
df578e7d8
|
1749 |
r->r_addend = (int)(long)(elf->hdr + |
bb66fc671
|
1750 1751 |
sechdr->sh_offset + (r->r_offset - sechdr->sh_addr)); |
56a974fa2
|
1752 1753 1754 1755 1756 1757 |
break; default: return 1; } return 0; } |
5b24c0715
|
1758 |
static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |
ae4ac1232
|
1759 1760 |
{ unsigned int r_typ = ELF_R_TYPE(r->r_info); |
5b24c0715
|
1761 |
unsigned int *location = reloc_location(elf, sechdr, r); |
ae4ac1232
|
1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 |
unsigned int inst; if (r_typ == R_MIPS_HI16) return 1; /* skip this */ inst = TO_NATIVE(*location); switch (r_typ) { case R_MIPS_LO16: r->r_addend = inst & 0xffff; break; case R_MIPS_26: r->r_addend = (inst & 0x03ffffff) << 2; break; case R_MIPS_32: r->r_addend = inst; break; } return 0; } |
5b24c0715
|
1780 |
static void section_rela(const char *modname, struct elf_info *elf, |
bb66fc671
|
1781 |
Elf_Shdr *sechdr) |
5b24c0715
|
1782 1783 1784 1785 1786 1787 |
{ Elf_Sym *sym; Elf_Rela *rela; Elf_Rela r; unsigned int r_sym; const char *fromsec; |
5b24c0715
|
1788 |
|
ff13f9269
|
1789 |
Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c0715
|
1790 |
Elf_Rela *stop = (void *)start + sechdr->sh_size; |
ff13f9269
|
1791 |
fromsec = sech_name(elf, sechdr); |
5b24c0715
|
1792 1793 |
fromsec += strlen(".rela"); /* if from section (name) is know good then skip it */ |
b614a697d
|
1794 |
if (match(fromsec, section_white_list)) |
5b24c0715
|
1795 |
return; |
e241a6303
|
1796 |
|
5b24c0715
|
1797 1798 1799 |
for (rela = start; rela < stop; rela++) { r.r_offset = TO_NATIVE(rela->r_offset); #if KERNEL_ELFCLASS == ELFCLASS64 |
ff13f9269
|
1800 |
if (elf->hdr->e_machine == EM_MIPS) { |
5b24c0715
|
1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 |
unsigned int r_typ; r_sym = ELF64_MIPS_R_SYM(rela->r_info); r_sym = TO_NATIVE(r_sym); r_typ = ELF64_MIPS_R_TYPE(rela->r_info); r.r_info = ELF64_R_INFO(r_sym, r_typ); } else { r.r_info = TO_NATIVE(rela->r_info); r_sym = ELF_R_SYM(r.r_info); } #else r.r_info = TO_NATIVE(rela->r_info); r_sym = ELF_R_SYM(r.r_info); #endif r.r_addend = TO_NATIVE(rela->r_addend); sym = elf->symtab_start + r_sym; /* Skip special sections */ |
1ce53adf1
|
1817 |
if (is_shndx_special(sym->st_shndx)) |
5b24c0715
|
1818 |
continue; |
e84048aa1
|
1819 1820 |
if (is_second_extable_reloc(start, rela, fromsec)) find_extable_entry_size(fromsec, &r); |
58fb0d4f2
|
1821 |
check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c0715
|
1822 1823 1824 1825 |
} } static void section_rel(const char *modname, struct elf_info *elf, |
bb66fc671
|
1826 |
Elf_Shdr *sechdr) |
5b24c0715
|
1827 1828 1829 1830 1831 1832 |
{ Elf_Sym *sym; Elf_Rel *rel; Elf_Rela r; unsigned int r_sym; const char *fromsec; |
5b24c0715
|
1833 |
|
ff13f9269
|
1834 |
Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset; |
5b24c0715
|
1835 |
Elf_Rel *stop = (void *)start + sechdr->sh_size; |
ff13f9269
|
1836 |
fromsec = sech_name(elf, sechdr); |
5b24c0715
|
1837 1838 |
fromsec += strlen(".rel"); /* if from section (name) is know good then skip it */ |
b614a697d
|
1839 |
if (match(fromsec, section_white_list)) |
5b24c0715
|
1840 1841 1842 1843 1844 |
return; for (rel = start; rel < stop; rel++) { r.r_offset = TO_NATIVE(rel->r_offset); #if KERNEL_ELFCLASS == ELFCLASS64 |
ff13f9269
|
1845 |
if (elf->hdr->e_machine == EM_MIPS) { |
5b24c0715
|
1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 |
unsigned int r_typ; r_sym = ELF64_MIPS_R_SYM(rel->r_info); r_sym = TO_NATIVE(r_sym); r_typ = ELF64_MIPS_R_TYPE(rel->r_info); r.r_info = ELF64_R_INFO(r_sym, r_typ); } else { r.r_info = TO_NATIVE(rel->r_info); r_sym = ELF_R_SYM(r.r_info); } #else r.r_info = TO_NATIVE(rel->r_info); r_sym = ELF_R_SYM(r.r_info); #endif r.r_addend = 0; |
ff13f9269
|
1860 |
switch (elf->hdr->e_machine) { |
5b24c0715
|
1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 |
case EM_386: if (addend_386_rel(elf, sechdr, &r)) continue; break; case EM_ARM: if (addend_arm_rel(elf, sechdr, &r)) continue; break; case EM_MIPS: if (addend_mips_rel(elf, sechdr, &r)) continue; break; } sym = elf->symtab_start + r_sym; /* Skip special sections */ |
1ce53adf1
|
1876 |
if (is_shndx_special(sym->st_shndx)) |
5b24c0715
|
1877 |
continue; |
e84048aa1
|
1878 1879 |
if (is_second_extable_reloc(start, rel, fromsec)) find_extable_entry_size(fromsec, &r); |
58fb0d4f2
|
1880 |
check_section_mismatch(modname, elf, &r, sym, fromsec); |
5b24c0715
|
1881 1882 |
} } |
b39927cf4
|
1883 1884 1885 1886 |
/** * A module includes a number of sections that are discarded * either when loaded or when used as built-in. * For loaded modules all functions marked __init and all data |
b595076a1
|
1887 |
* marked __initdata will be discarded when the module has been initialized. |
b39927cf4
|
1888 1889 |
* Likewise for modules used built-in the sections marked __exit * are discarded because __exit marked function are supposed to be called |
32be1d223
|
1890 |
* only when a module is unloaded which never happens for built-in modules. |
b39927cf4
|
1891 1892 1893 1894 1895 |
* The check_sec_ref() function traverses all relocation records * to find all references to a section that reference a section that will * be discarded and warns about it. **/ static void check_sec_ref(struct module *mod, const char *modname, |
bb66fc671
|
1896 |
struct elf_info *elf) |
b39927cf4
|
1897 1898 |
{ int i; |
b39927cf4
|
1899 |
Elf_Shdr *sechdrs = elf->sechdrs; |
62070fa42
|
1900 |
|
b39927cf4
|
1901 |
/* Walk through all sections */ |
1ce53adf1
|
1902 |
for (i = 0; i < elf->num_sections; i++) { |
b614a697d
|
1903 |
check_section(modname, elf, &elf->sechdrs[i]); |
b39927cf4
|
1904 |
/* We want to process only relocation sections and not .init */ |
5b24c0715
|
1905 |
if (sechdrs[i].sh_type == SHT_RELA) |
10668220a
|
1906 |
section_rela(modname, elf, &elf->sechdrs[i]); |
5b24c0715
|
1907 |
else if (sechdrs[i].sh_type == SHT_REL) |
10668220a
|
1908 |
section_rel(modname, elf, &elf->sechdrs[i]); |
b39927cf4
|
1909 1910 |
} } |
7d02b490e
|
1911 1912 |
static char *remove_dot(char *s) { |
fcd38ed0f
|
1913 |
size_t n = strcspn(s, "."); |
7d02b490e
|
1914 |
|
fcd38ed0f
|
1915 1916 1917 |
if (n && s[n]) { size_t m = strspn(s + n + 1, "0123456789"); if (m && (s[n + m] == '.' || s[n + m] == 0)) |
7d02b490e
|
1918 1919 1920 1921 |
s[n] = 0; } return s; } |
8b1857436
|
1922 |
static void read_symbols(const char *modname) |
1da177e4c
|
1923 1924 1925 |
{ const char *symname; char *version; |
b817f6fef
|
1926 |
char *license; |
1da177e4c
|
1927 1928 1929 |
struct module *mod; struct elf_info info = { }; Elf_Sym *sym; |
85bd2fddd
|
1930 1931 |
if (!parse_elf(&info, modname)) return; |
1da177e4c
|
1932 1933 1934 1935 1936 1937 |
mod = new_module(modname); /* When there's no vmlinux, don't print warnings about * unresolved symbols (since there'll be too many ;) */ if (is_vmlinux(modname)) { |
1da177e4c
|
1938 |
have_vmlinux = 1; |
1da177e4c
|
1939 1940 |
mod->skip = 1; } |
bca2ccee4
|
1941 |
license = get_modinfo(&info, "license"); |
ba1029c9c
|
1942 |
if (!license && !is_vmlinux(modname)) |
2fa365682
|
1943 1944 1945 1946 1947 |
warn("modpost: missing MODULE_LICENSE() in %s " "see include/linux/module.h for " "more information ", modname); |
b817f6fef
|
1948 1949 1950 1951 1952 1953 1954 |
while (license) { if (license_is_gpl_compatible(license)) mod->gpl_compatible = 1; else { mod->gpl_compatible = 0; break; } |
bca2ccee4
|
1955 |
license = get_next_modinfo(&info, "license", license); |
b817f6fef
|
1956 |
} |
1da177e4c
|
1957 |
for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { |
7d02b490e
|
1958 |
symname = remove_dot(info.strtab + sym->st_name); |
1da177e4c
|
1959 1960 1961 1962 |
handle_modversions(mod, &info, sym, symname); handle_moddevtable(mod, &info, sym, symname); } |
074a04f57
|
1963 |
if (!is_vmlinux(modname) || vmlinux_section_warnings) |
10668220a
|
1964 |
check_sec_ref(mod, modname, &info); |
1da177e4c
|
1965 |
|
bca2ccee4
|
1966 |
version = get_modinfo(&info, "version"); |
1da177e4c
|
1967 1968 1969 1970 1971 1972 1973 1974 |
if (version) maybe_frob_rcs_version(modname, version, info.modinfo, version - (char *)info.hdr); if (version || (all_versions && !is_vmlinux(modname))) get_src_version(modname, mod->srcversion, sizeof(mod->srcversion)-1); parse_elf_finish(&info); |
8c8ef42ae
|
1975 |
/* Our trick to get versioning for module struct etc. - it's |
1da177e4c
|
1976 1977 1978 1979 |
* never passed as an argument to an exported function, so * the automatic versioning doesn't pick it up, but it's really * important anyhow */ if (modversions) |
8c8ef42ae
|
1980 |
mod->unres = alloc_symbol("module_layout", 0, mod->unres); |
1da177e4c
|
1981 |
} |
712f9b468
|
1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 |
static void read_symbols_from_files(const char *filename) { FILE *in = stdin; char fname[PATH_MAX]; if (strcmp(filename, "-") != 0) { in = fopen(filename, "r"); if (!in) fatal("Can't open filenames file %s: %m", filename); } while (fgets(fname, PATH_MAX, in) != NULL) { if (strends(fname, " ")) fname[strlen(fname)-1] = '\0'; read_symbols(fname); } if (in != stdin) fclose(in); } |
1da177e4c
|
2003 2004 2005 2006 2007 |
#define SZ 500 /* We first write the generated file into memory using the * following helper, then compare to the file on disk and * only update the later if anything changed */ |
5c3ead8c7
|
2008 2009 |
void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, const char *fmt, ...) |
1da177e4c
|
2010 2011 2012 2013 |
{ char tmp[SZ]; int len; va_list ap; |
62070fa42
|
2014 |
|
1da177e4c
|
2015 2016 |
va_start(ap, fmt); len = vsnprintf(tmp, SZ, fmt, ap); |
7670f023a
|
2017 |
buf_write(buf, tmp, len); |
1da177e4c
|
2018 2019 |
va_end(ap); } |
5c3ead8c7
|
2020 |
void buf_write(struct buffer *buf, const char *s, int len) |
1da177e4c
|
2021 2022 |
{ if (buf->size - buf->pos < len) { |
7670f023a
|
2023 |
buf->size += len + SZ; |
1f3aa9002
|
2024 |
buf->p = NOFAIL(realloc(buf->p, buf->size)); |
1da177e4c
|
2025 2026 2027 2028 |
} strncpy(buf->p + buf->pos, s, len); buf->pos += len; } |
c96fca213
|
2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 |
static void check_for_gpl_usage(enum export exp, const char *m, const char *s) { const char *e = is_vmlinux(m) ?"":".ko"; switch (exp) { case export_gpl: fatal("modpost: GPL-incompatible module %s%s " "uses GPL-only symbol '%s' ", m, e, s); break; case export_unused_gpl: fatal("modpost: GPL-incompatible module %s%s " "uses GPL-only symbol marked UNUSED '%s' ", m, e, s); break; case export_gpl_future: warn("modpost: GPL-incompatible module %s%s " "uses future GPL-only symbol '%s' ", m, e, s); break; case export_plain: case export_unused: case export_unknown: /* ignore */ break; } } |
df578e7d8
|
2056 |
static void check_for_unused(enum export exp, const char *m, const char *s) |
c96fca213
|
2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 |
{ const char *e = is_vmlinux(m) ?"":".ko"; switch (exp) { case export_unused: case export_unused_gpl: warn("modpost: module %s%s " "uses symbol '%s' marked UNUSED ", m, e, s); break; default: /* ignore */ break; } } static void check_exports(struct module *mod) |
b817f6fef
|
2074 2075 2076 2077 |
{ struct symbol *s, *exp; for (s = mod->unres; s; s = s->next) { |
6449bd621
|
2078 |
const char *basename; |
b817f6fef
|
2079 2080 2081 |
exp = find_symbol(s->name); if (!exp || exp->module == mod) continue; |
6449bd621
|
2082 |
basename = strrchr(mod->name, '/'); |
b817f6fef
|
2083 2084 |
if (basename) basename++; |
c96fca213
|
2085 2086 2087 2088 2089 |
else basename = mod->name; if (!mod->gpl_compatible) check_for_gpl_usage(exp->export, basename, exp->name); check_for_unused(exp->export, basename, exp->name); |
df578e7d8
|
2090 |
} |
b817f6fef
|
2091 |
} |
4fd3e4ef1
|
2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 |
static int check_modname_len(struct module *mod) { const char *mod_name; mod_name = strrchr(mod->name, '/'); if (mod_name == NULL) mod_name = mod->name; else mod_name++; if (strlen(mod_name) >= MODULE_NAME_LEN) { merror("module name is too long [%s.ko] ", mod->name); return 1; } return 0; } |
5c3ead8c7
|
2109 2110 2111 2112 |
/** * Header for the generated file **/ static void add_header(struct buffer *b, struct module *mod) |
1da177e4c
|
2113 |
{ |
9afb719e7
|
2114 2115 |
buf_printf(b, "#include <linux/build-salt.h> "); |
1da177e4c
|
2116 2117 2118 2119 2120 2121 2122 2123 |
buf_printf(b, "#include <linux/module.h> "); buf_printf(b, "#include <linux/vermagic.h> "); buf_printf(b, "#include <linux/compiler.h> "); buf_printf(b, " "); |
9afb719e7
|
2124 2125 2126 2127 |
buf_printf(b, "BUILD_SALT; "); buf_printf(b, " "); |
1da177e4c
|
2128 2129 |
buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING); "); |
3e2e857f9
|
2130 2131 |
buf_printf(b, "MODULE_INFO(name, KBUILD_MODNAME); "); |
1da177e4c
|
2132 2133 |
buf_printf(b, " "); |
e0f244c63
|
2134 2135 |
buf_printf(b, "__visible struct module __this_module "); |
1da177e4c
|
2136 2137 |
buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = { "); |
3c7ec94d2
|
2138 2139 |
buf_printf(b, "\t.name = KBUILD_MODNAME, "); |
1da177e4c
|
2140 |
if (mod->has_init) |
3c7ec94d2
|
2141 2142 |
buf_printf(b, "\t.init = init_module, "); |
1da177e4c
|
2143 2144 2145 |
if (mod->has_cleanup) buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD " |
3c7ec94d2
|
2146 2147 |
"\t.exit = cleanup_module, " |
1da177e4c
|
2148 2149 |
"#endif "); |
3c7ec94d2
|
2150 2151 |
buf_printf(b, "\t.arch = MODULE_ARCH_INIT, "); |
1da177e4c
|
2152 2153 2154 |
buf_printf(b, "}; "); } |
2449b8ba0
|
2155 2156 2157 2158 2159 2160 2161 |
static void add_intree_flag(struct buffer *b, int is_intree) { if (is_intree) buf_printf(b, " MODULE_INFO(intree, \"Y\"); "); } |
caf7501a1
|
2162 2163 2164 |
/* Cannot check for assembler */ static void add_retpoline(struct buffer *b) { |
4bef2bacb
|
2165 2166 2167 |
buf_printf(b, " #ifdef CONFIG_RETPOLINE "); |
caf7501a1
|
2168 2169 2170 2171 2172 |
buf_printf(b, "MODULE_INFO(retpoline, \"Y\"); "); buf_printf(b, "#endif "); } |
5c7251384
|
2173 |
static void add_staging_flag(struct buffer *b, const char *name) |
a9860bf05
|
2174 |
{ |
d62c47652
|
2175 |
if (strstarts(name, "drivers/staging")) |
a9860bf05
|
2176 2177 2178 2179 |
buf_printf(b, " MODULE_INFO(staging, \"Y\"); "); } |
5c3ead8c7
|
2180 2181 2182 |
/** * Record CRCs for unresolved symbols **/ |
c53ddacdc
|
2183 |
static int add_versions(struct buffer *b, struct module *mod) |
1da177e4c
|
2184 2185 |
{ struct symbol *s, *exp; |
c53ddacdc
|
2186 |
int err = 0; |
1da177e4c
|
2187 2188 2189 2190 |
for (s = mod->unres; s; s = s->next) { exp = find_symbol(s->name); if (!exp || exp->module == mod) { |
c53ddacdc
|
2191 |
if (have_vmlinux && !s->weak) { |
2a1166594
|
2192 2193 2194 2195 2196 2197 2198 |
if (warn_unresolved) { warn("\"%s\" [%s.ko] undefined! ", s->name, mod->name); } else { merror("\"%s\" [%s.ko] undefined! ", |
bb66fc671
|
2199 |
s->name, mod->name); |
2a1166594
|
2200 2201 |
err = 1; } |
c53ddacdc
|
2202 |
} |
1da177e4c
|
2203 2204 2205 2206 2207 2208 2209 2210 |
continue; } s->module = exp->module; s->crc_valid = exp->crc_valid; s->crc = exp->crc; } if (!modversions) |
c53ddacdc
|
2211 |
return err; |
1da177e4c
|
2212 2213 2214 2215 2216 |
buf_printf(b, " "); buf_printf(b, "static const struct modversion_info ____versions[] "); |
3ff6eecca
|
2217 2218 |
buf_printf(b, "__used "); |
1da177e4c
|
2219 2220 2221 2222 |
buf_printf(b, "__attribute__((section(\"__versions\"))) = { "); for (s = mod->unres; s; s = s->next) { |
df578e7d8
|
2223 |
if (!s->module) |
1da177e4c
|
2224 |
continue; |
1da177e4c
|
2225 |
if (!s->crc_valid) { |
cb80514d9
|
2226 2227 |
warn("\"%s\" [%s.ko] has no CRC! ", |
1da177e4c
|
2228 2229 2230 |
s->name, mod->name); continue; } |
5cfb203a3
|
2231 2232 2233 2234 2235 2236 2237 |
if (strlen(s->name) >= MODULE_NAME_LEN) { merror("too long symbol \"%s\" [%s.ko] ", s->name, mod->name); err = 1; break; } |
b2c5cdcfd
|
2238 2239 |
buf_printf(b, "\t{ %#8x, \"%s\" }, ", |
a4b6a77b7
|
2240 |
s->crc, s->name); |
1da177e4c
|
2241 2242 2243 2244 |
} buf_printf(b, "}; "); |
c53ddacdc
|
2245 2246 |
return err; |
1da177e4c
|
2247 |
} |
5c3ead8c7
|
2248 2249 |
static void add_depends(struct buffer *b, struct module *mod, struct module *modules) |
1da177e4c
|
2250 2251 2252 2253 |
{ struct symbol *s; struct module *m; int first = 1; |
df578e7d8
|
2254 |
for (m = modules; m; m = m->next) |
1da177e4c
|
2255 |
m->seen = is_vmlinux(m->name); |
1da177e4c
|
2256 2257 2258 2259 2260 |
buf_printf(b, " "); buf_printf(b, "static const char __module_depends[] "); |
3ff6eecca
|
2261 2262 |
buf_printf(b, "__used "); |
1da177e4c
|
2263 2264 2265 2266 |
buf_printf(b, "__attribute__((section(\".modinfo\"))) = "); buf_printf(b, "\"depends="); for (s = mod->unres; s; s = s->next) { |
a61b2dfd1
|
2267 |
const char *p; |
1da177e4c
|
2268 2269 2270 2271 2272 2273 2274 |
if (!s->module) continue; if (s->module->seen) continue; s->module->seen = 1; |
df578e7d8
|
2275 2276 |
p = strrchr(s->module->name, '/'); if (p) |
a61b2dfd1
|
2277 2278 2279 2280 |
p++; else p = s->module->name; buf_printf(b, "%s%s", first ? "" : ",", p); |
1da177e4c
|
2281 2282 2283 2284 2285 |
first = 0; } buf_printf(b, "\"; "); } |
5c3ead8c7
|
2286 |
static void add_srcversion(struct buffer *b, struct module *mod) |
1da177e4c
|
2287 2288 2289 2290 2291 2292 2293 2294 2295 |
{ if (mod->srcversion[0]) { buf_printf(b, " "); buf_printf(b, "MODULE_INFO(srcversion, \"%s\"); ", mod->srcversion); } } |
5c3ead8c7
|
2296 |
static void write_if_changed(struct buffer *b, const char *fname) |
1da177e4c
|
2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 |
{ char *tmp; FILE *file; struct stat st; file = fopen(fname, "r"); if (!file) goto write; if (fstat(fileno(file), &st) < 0) goto close_write; if (st.st_size != b->pos) goto close_write; tmp = NOFAIL(malloc(b->pos)); if (fread(tmp, 1, b->pos, file) != b->pos) goto free_write; if (memcmp(tmp, b->p, b->pos) != 0) goto free_write; free(tmp); fclose(file); return; free_write: free(tmp); close_write: fclose(file); write: file = fopen(fname, "w"); if (!file) { perror(fname); exit(1); } if (fwrite(b->p, 1, b->pos, file) != b->pos) { perror(fname); exit(1); } fclose(file); } |
bd5cbcedf
|
2339 |
/* parse Module.symvers file. line format: |
534b89a9f
|
2340 |
* 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something] |
bd5cbcedf
|
2341 |
**/ |
040fcc819
|
2342 |
static void read_dump(const char *fname, unsigned int kernel) |
1da177e4c
|
2343 2344 2345 2346 |
{ unsigned long size, pos = 0; void *file = grab_file(fname, &size); char *line; |
df578e7d8
|
2347 |
if (!file) |
1da177e4c
|
2348 2349 2350 2351 |
/* No symbol versions, silently ignore */ return; while ((line = get_next_line(&pos, file, size))) { |
534b89a9f
|
2352 |
char *symname, *modname, *d, *export, *end; |
1da177e4c
|
2353 2354 |
unsigned int crc; struct module *mod; |
040fcc819
|
2355 |
struct symbol *s; |
1da177e4c
|
2356 2357 2358 2359 2360 2361 2362 |
if (!(symname = strchr(line, '\t'))) goto fail; *symname++ = '\0'; if (!(modname = strchr(symname, '\t'))) goto fail; *modname++ = '\0'; |
9ac545b0f
|
2363 |
if ((export = strchr(modname, '\t')) != NULL) |
bd5cbcedf
|
2364 |
*export++ = '\0'; |
534b89a9f
|
2365 2366 |
if (export && ((end = strchr(export, '\t')) != NULL)) *end = '\0'; |
1da177e4c
|
2367 2368 2369 |
crc = strtoul(line, &d, 16); if (*symname == '\0' || *modname == '\0' || *d != '\0') goto fail; |
df578e7d8
|
2370 2371 2372 |
mod = find_module(modname); if (!mod) { if (is_vmlinux(modname)) |
1da177e4c
|
2373 |
have_vmlinux = 1; |
0fa3a88cf
|
2374 |
mod = new_module(modname); |
1da177e4c
|
2375 2376 |
mod->skip = 1; } |
bd5cbcedf
|
2377 |
s = sym_add_exported(symname, mod, export_no(export)); |
8e70c4588
|
2378 2379 |
s->kernel = kernel; s->preloaded = 1; |
bd5cbcedf
|
2380 |
sym_update_crc(symname, mod, crc, export_no(export)); |
1da177e4c
|
2381 |
} |
2ee41e62b
|
2382 |
release_file(file, size); |
1da177e4c
|
2383 2384 |
return; fail: |
2ee41e62b
|
2385 |
release_file(file, size); |
1da177e4c
|
2386 2387 2388 |
fatal("parse error in symbol dump file "); } |
040fcc819
|
2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 |
/* For normal builds always dump all symbols. * For external modules only dump symbols * that are not read from kernel Module.symvers. **/ static int dump_sym(struct symbol *sym) { if (!external_module) return 1; if (sym->vmlinux || sym->kernel) return 0; return 1; } |
62070fa42
|
2401 |
|
5c3ead8c7
|
2402 |
static void write_dump(const char *fname) |
1da177e4c
|
2403 2404 2405 2406 2407 2408 2409 2410 |
{ struct buffer buf = { }; struct symbol *symbol; int n; for (n = 0; n < SYMBOL_HASH_SIZE ; n++) { symbol = symbolhash[n]; while (symbol) { |
040fcc819
|
2411 |
if (dump_sym(symbol)) |
bd5cbcedf
|
2412 2413 |
buf_printf(&buf, "0x%08x\t%s\t%s\t%s ", |
62070fa42
|
2414 |
symbol->crc, symbol->name, |
bd5cbcedf
|
2415 2416 |
symbol->module->name, export_str(symbol->export)); |
1da177e4c
|
2417 2418 2419 2420 |
symbol = symbol->next; } } write_if_changed(&buf, fname); |
c7d47f26d
|
2421 |
free(buf.p); |
1da177e4c
|
2422 |
} |
2d04b5ae1
|
2423 2424 2425 2426 |
struct ext_sym_list { struct ext_sym_list *next; const char *file; }; |
5c3ead8c7
|
2427 |
int main(int argc, char **argv) |
1da177e4c
|
2428 2429 2430 |
{ struct module *mod; struct buffer buf = { }; |
040fcc819
|
2431 |
char *kernel_read = NULL, *module_read = NULL; |
712f9b468
|
2432 |
char *dump_write = NULL, *files_source = NULL; |
1da177e4c
|
2433 |
int opt; |
c53ddacdc
|
2434 |
int err; |
2d04b5ae1
|
2435 2436 |
struct ext_sym_list *extsym_iter; struct ext_sym_list *extsym_start = NULL; |
1da177e4c
|
2437 |
|
47490ec14
|
2438 |
while ((opt = getopt(argc, argv, "i:I:e:mnsST:o:awM:K:E")) != -1) { |
df578e7d8
|
2439 2440 2441 2442 2443 2444 2445 2446 |
switch (opt) { case 'i': kernel_read = optarg; break; case 'I': module_read = optarg; external_module = 1; break; |
2d04b5ae1
|
2447 2448 2449 2450 2451 2452 2453 2454 |
case 'e': external_module = 1; extsym_iter = NOFAIL(malloc(sizeof(*extsym_iter))); extsym_iter->next = extsym_start; extsym_iter->file = optarg; extsym_start = extsym_iter; break; |
df578e7d8
|
2455 2456 2457 |
case 'm': modversions = 1; break; |
eed380f3f
|
2458 2459 2460 |
case 'n': ignore_missing_files = 1; break; |
df578e7d8
|
2461 2462 2463 2464 2465 2466 2467 2468 2469 |
case 'o': dump_write = optarg; break; case 'a': all_versions = 1; break; case 's': vmlinux_section_warnings = 0; break; |
588ccd732
|
2470 2471 2472 |
case 'S': sec_mismatch_verbose = 0; break; |
712f9b468
|
2473 2474 2475 |
case 'T': files_source = optarg; break; |
df578e7d8
|
2476 2477 2478 |
case 'w': warn_unresolved = 1; break; |
47490ec14
|
2479 2480 2481 |
case 'E': sec_mismatch_fatal = 1; break; |
df578e7d8
|
2482 2483 |
default: exit(1); |
1da177e4c
|
2484 2485 |
} } |
040fcc819
|
2486 2487 2488 2489 |
if (kernel_read) read_dump(kernel_read, 1); if (module_read) read_dump(module_read, 0); |
2d04b5ae1
|
2490 2491 2492 2493 2494 2495 |
while (extsym_start) { read_dump(extsym_start->file, 0); extsym_iter = extsym_start->next; free(extsym_start); extsym_start = extsym_iter; } |
1da177e4c
|
2496 |
|
df578e7d8
|
2497 |
while (optind < argc) |
1da177e4c
|
2498 |
read_symbols(argv[optind++]); |
1da177e4c
|
2499 |
|
712f9b468
|
2500 2501 |
if (files_source) read_symbols_from_files(files_source); |
1da177e4c
|
2502 2503 2504 |
for (mod = modules; mod; mod = mod->next) { if (mod->skip) continue; |
c96fca213
|
2505 |
check_exports(mod); |
b817f6fef
|
2506 |
} |
c53ddacdc
|
2507 |
err = 0; |
b817f6fef
|
2508 |
for (mod = modules; mod; mod = mod->next) { |
d93e1719a
|
2509 |
char fname[PATH_MAX]; |
666ab414f
|
2510 |
|
b817f6fef
|
2511 2512 |
if (mod->skip) continue; |
1da177e4c
|
2513 2514 |
buf.pos = 0; |
4fd3e4ef1
|
2515 |
err |= check_modname_len(mod); |
1da177e4c
|
2516 |
add_header(&buf, mod); |
2449b8ba0
|
2517 |
add_intree_flag(&buf, !external_module); |
caf7501a1
|
2518 |
add_retpoline(&buf); |
a9860bf05
|
2519 |
add_staging_flag(&buf, mod->name); |
c53ddacdc
|
2520 |
err |= add_versions(&buf, mod); |
1da177e4c
|
2521 2522 2523 2524 2525 2526 2527 |
add_depends(&buf, mod, modules); add_moddevtable(&buf, mod); add_srcversion(&buf, mod); sprintf(fname, "%s.mod.c", mod->name); write_if_changed(&buf, fname); } |
1da177e4c
|
2528 2529 |
if (dump_write) write_dump(dump_write); |
47490ec14
|
2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 |
if (sec_mismatch_count) { if (!sec_mismatch_verbose) { warn("modpost: Found %d section mismatch(es). " "To see full details build your kernel with: " "'make CONFIG_DEBUG_SECTION_MISMATCH=y' ", sec_mismatch_count); } if (sec_mismatch_fatal) { fatal("modpost: Section mismatches detected. " "Set CONFIG_SECTION_MISMATCH_WARN_ONLY=y to allow them. "); } } |
c7d47f26d
|
2547 |
free(buf.p); |
1da177e4c
|
2548 |
|
c53ddacdc
|
2549 |
return err; |
1da177e4c
|
2550 |
} |