/* SPDX-License-Identifier: GPL-2.0 */ #include #include #include #include #include #include #include #include #include #include #include #include #include "../../include/linux/module_symbol.h" #include #include "elfconfig.h" /* On BSD-alike OSes elf.h defines these according to host's word size */ #undef ELF_ST_BIND #undef ELF_ST_TYPE #undef ELF_R_SYM #undef ELF_R_TYPE #if KERNEL_ELFCLASS == ELFCLASS32 #define Elf_Ehdr Elf32_Ehdr #define Elf_Shdr Elf32_Shdr #define Elf_Sym Elf32_Sym #define Elf_Addr Elf32_Addr #define Elf_Section Elf32_Half #define ELF_ST_BIND ELF32_ST_BIND #define ELF_ST_TYPE ELF32_ST_TYPE #define Elf_Rel Elf32_Rel #define Elf_Rela Elf32_Rela #define ELF_R_SYM ELF32_R_SYM #define ELF_R_TYPE ELF32_R_TYPE #else #define Elf_Ehdr Elf64_Ehdr #define Elf_Shdr Elf64_Shdr #define Elf_Sym Elf64_Sym #define Elf_Addr Elf64_Addr #define Elf_Section Elf64_Half #define ELF_ST_BIND ELF64_ST_BIND #define ELF_ST_TYPE ELF64_ST_TYPE #define Elf_Rel Elf64_Rel #define Elf_Rela Elf64_Rela #define ELF_R_SYM ELF64_R_SYM #define ELF_R_TYPE ELF64_R_TYPE #endif #define bswap(x) \ ({ \ _Static_assert(sizeof(x) == 1 || sizeof(x) == 2 || \ sizeof(x) == 4 || sizeof(x) == 8, "bug"); \ (typeof(x))(sizeof(x) == 2 ? bswap_16(x) : \ sizeof(x) == 4 ? bswap_32(x) : \ sizeof(x) == 8 ? bswap_64(x) : \ x); \ }) #define TO_NATIVE(x) \ (target_is_big_endian == host_is_big_endian ? x : bswap(x)) #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0) struct buffer { char *p; int pos; int size; }; void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf, const char *fmt, ...); void buf_write(struct buffer *buf, const char *s, int len); /** * struct module_alias - auto-generated MODULE_ALIAS() * * @node: linked to module::aliases * @str: a string for MODULE_ALIAS() */ struct module_alias { struct list_head node; char str[]; }; /** * struct module - represent a module (vmlinux or *.ko) * * @aliases: list head for module_aliases */ struct module { struct list_head list; struct list_head exported_symbols; struct list_head unresolved_symbols; bool is_gpl_compatible; bool from_dump; /* true if module was loaded from *.symvers */ bool is_vmlinux; bool seen; bool has_init; bool has_cleanup; char srcversion[25]; // Missing namespace dependencies struct list_head missing_namespaces; // Actual imported namespaces struct list_head imported_namespaces; struct list_head aliases; char name[]; }; struct elf_info { size_t size; Elf_Ehdr *hdr; Elf_Shdr *sechdrs; Elf_Sym *symtab_start; Elf_Sym *symtab_stop; unsigned int export_symbol_secndx; /* .export_symbol section */ char *strtab; char *modinfo; unsigned int modinfo_len; /* support for 32bit section numbers */ unsigned int num_sections; /* max_secindex + 1 */ unsigned int secindex_strings; /* if Nth symbol table entry has .st_shndx = SHN_XINDEX, * take shndx from symtab_shndx_start[N] instead */ Elf32_Word *symtab_shndx_start; Elf32_Word *symtab_shndx_stop; struct symsearch *symsearch; }; /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */ static inline unsigned int get_secindex(const struct elf_info *info, const Elf_Sym *sym) { unsigned int index = sym->st_shndx; /* * Elf{32,64}_Sym::st_shndx is 2 byte. Big section numbers are available * in the .symtab_shndx section. */ if (index == SHN_XINDEX) return info->symtab_shndx_start[sym - info->symtab_start]; /* * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of * the way to UINT_MAX-255..UINT_MAX, to avoid conflicting with real * section indices. */ if (index >= SHN_LORESERVE && index <= SHN_HIRESERVE) return index - SHN_HIRESERVE - 1; return index; } /* * If there's no name there, ignore it; likewise, ignore it if it's * one of the magic symbols emitted used by current tools. * * Internal symbols created by tools should be ignored by modpost. */ static inline bool is_valid_name(struct elf_info *elf, Elf_Sym *sym) { const char *name = elf->strtab + sym->st_name; if (!name || !strlen(name)) return false; return !is_mapping_symbol(name); } /* symsearch.c */ void symsearch_init(struct elf_info *elf); void symsearch_finish(struct elf_info *elf); Elf_Sym *symsearch_find_nearest(struct elf_info *elf, Elf_Addr addr, unsigned int secndx, bool allow_negative, Elf_Addr min_distance); /* file2alias.c */ void handle_moddevtable(struct module *mod, struct elf_info *info, Elf_Sym *sym, const char *symname); /* sumversion.c */ void get_src_version(const char *modname, char sum[], unsigned sumlen); /* from modpost.c */ extern bool target_is_big_endian; extern bool host_is_big_endian; char *read_text_file(const char *filename); char *get_line(char **stringp); void *sym_get_data(const struct elf_info *info, const Elf_Sym *sym); void __attribute__((format(printf, 2, 3))) modpost_log(bool is_error, const char *fmt, ...); /* * warn - show the given message, then let modpost continue running, still * allowing modpost to exit successfully. This should be used when * we still allow to generate vmlinux and modules. * * error - show the given message, then let modpost continue running, but fail * in the end. This should be used when we should stop building vmlinux * or modules, but we can continue running modpost to catch as many * issues as possible. * * fatal - show the given message, and bail out immediately. This should be * used when there is no point to continue running modpost. */ #define warn(fmt, args...) modpost_log(false, fmt, ##args) #define error(fmt, args...) modpost_log(true, fmt, ##args) #define fatal(fmt, args...) do { error(fmt, ##args); exit(1); } while (1)