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/* Postprocess module symbol versions * * Copyright 2003       Kai Germaschewski * Copyright 2002-2004  Rusty Russell, IBM Corporation * Copyright 2006-2008  Sam Ravnborg * 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 ... */ #define _GNU_SOURCE#include <elf.h>#include <fnmatch.h>#include <stdio.h>#include <ctype.h>#include <string.h>#include <limits.h>#include <stdbool.h>#include <errno.h> #include <hash.h>#include <hashtable.h>#include <list.h>#include <xalloc.h>#include "modpost.h"#include "../../include/linux/license.h" #define MODULE_NS_PREFIX "module:" static bool module_enabled;/* Are we using CONFIG_MODVERSIONS? */static bool modversions;/* Is CONFIG_MODULE_SRCVERSION_ALL set? */static bool all_versions;/* Is CONFIG_BASIC_MODVERSIONS set? */static bool basic_modversions;/* Is CONFIG_EXTENDED_MODVERSIONS set? */static bool extended_modversions;/* If we are modposting external module set to 1 */static bool external_module;/* Only warn about unresolved symbols */static bool warn_unresolved; static int sec_mismatch_count;static bool sec_mismatch_warn_only = true;/* Trim EXPORT_SYMBOLs that are unused by in-tree modules */static bool trim_unused_exports; /* ignore missing files */static bool ignore_missing_files;/* If set to 1, only warn (instead of error) about missing ns imports */static bool allow_missing_ns_imports; static bool error_occurred; static bool extra_warn __attribute__((unused)); bool target_is_big_endian;bool host_is_big_endian; /* * Cut off the warnings when there are too many. This typically occurs when * vmlinux is missing. ('make modules' without building vmlinux.) */#define MAX_UNRESOLVED_REPORTS	10static unsigned int nr_unresolved; /* 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)) void modpost_log(bool is_error, const char *fmt, ...){	va_list arglist; 	if (is_error) {		fprintf(stderr, "ERROR: ");		error_occurred = true;	} else {		fprintf(stderr, "WARNING: ");	} 	fprintf(stderr, "modpost: "); 	va_start(arglist, fmt);	vfprintf(stderr, fmt, arglist);	va_end(arglist);} 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;} /** * get_basename - return the last part of a pathname. * * @path: path to extract the filename from. */const char *get_basename(const char *path){	const char *tail = strrchr(path, '/'); 	return tail ? tail + 1 : path;} char *read_text_file(const char *filename){	struct stat st;	size_t nbytes;	int fd;	char *buf; 	fd = open(filename, O_RDONLY);	if (fd < 0) {		perror(filename);		exit(1);	} 	if (fstat(fd, &st) < 0) {		perror(filename);		exit(1);	} 	buf = xmalloc(st.st_size + 1); 	nbytes = st.st_size; 	while (nbytes) {		ssize_t bytes_read; 		bytes_read = read(fd, buf, nbytes);		if (bytes_read < 0) {			perror(filename);			exit(1);		} 		nbytes -= bytes_read;	}	buf[st.st_size] = '\0'; 	close(fd); 	return buf;} char *get_line(char **stringp){	char *orig = *stringp, *next; 	/* do not return the unwanted extra line at EOF */	if (!orig || *orig == '\0')		return NULL; 	/* don't use strsep here, it is not available everywhere */	next = strchr(orig, '\n');	if (next)		*next++ = '\0'; 	*stringp = next; 	return orig;} /* A list of all modules we processed */LIST_HEAD(modules); static struct module *find_module(const char *filename, const char *modname){	struct module *mod; 	list_for_each_entry(mod, &modules, list) {		if (!strcmp(mod->dump_file, filename) &&		    !strcmp(mod->name, modname))			return mod;	}	return NULL;} static struct module *new_module(const char *name, size_t namelen){	struct module *mod; 	mod = xmalloc(sizeof(*mod) + namelen + 1);	memset(mod, 0, sizeof(*mod)); 	INIT_LIST_HEAD(&mod->exported_symbols);	INIT_LIST_HEAD(&mod->unresolved_symbols);	INIT_LIST_HEAD(&mod->missing_namespaces);	INIT_LIST_HEAD(&mod->imported_namespaces);	INIT_LIST_HEAD(&mod->aliases); 	memcpy(mod->name, name, namelen);	mod->name[namelen] = '\0';	mod->is_vmlinux = (strcmp(mod->name, "vmlinux") == 0); 	/*	 * Set mod->is_gpl_compatible to true by default. If MODULE_LICENSE()	 * is missing, do not check the use for EXPORT_SYMBOL_GPL() because	 * modpost will exit with an error anyway.	 */	mod->is_gpl_compatible = true; 	list_add_tail(&mod->list, &modules); 	return mod;} struct symbol {	struct hlist_node hnode;/* link to hash table */	struct list_head list;	/* link to module::exported_symbols or module::unresolved_symbols */	struct module *module;	char *namespace;	unsigned int crc;	bool crc_valid;	bool weak;	bool is_func;	bool is_gpl_only;	/* exported by EXPORT_SYMBOL_GPL */	bool used;		/* there exists a user of this symbol */	char name[];}; static HASHTABLE_DEFINE(symbol_hashtable, 1U << 10); /** * 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){	struct symbol *s = xmalloc(sizeof(*s) + strlen(name) + 1); 	memset(s, 0, sizeof(*s));	strcpy(s->name, name); 	return s;} static uint8_t get_symbol_flags(const struct symbol *sym){	return sym->is_gpl_only ? KSYM_FLAG_GPL_ONLY : 0;} /* For the hash of exported symbols */static void hash_add_symbol(struct symbol *sym){	hash_add(symbol_hashtable, &sym->hnode, hash_str(sym->name));} static void sym_add_unresolved(const char *name, struct module *mod, bool weak){	struct symbol *sym; 	sym = alloc_symbol(name);	sym->weak = weak; 	list_add_tail(&sym->list, &mod->unresolved_symbols);} static struct symbol *sym_find_with_module(const char *name, struct module *mod){	struct symbol *s; 	/* For our purposes, .foo matches foo.  PPC64 needs this. */	if (name[0] == '.')		name++; 	hash_for_each_possible(symbol_hashtable, s, hnode, hash_str(name)) {		if (strcmp(s->name, name) == 0 && (!mod || s->module == mod))			return s;	}	return NULL;} static struct symbol *find_symbol(const char *name){	return sym_find_with_module(name, NULL);} struct namespace_list {	struct list_head list;	char namespace[];}; static bool contains_namespace(struct list_head *head, const char *namespace){	struct namespace_list *list; 	/*	 * The default namespace is null string "", which is always implicitly	 * contained.	 */	if (!namespace[0])		return true; 	list_for_each_entry(list, head, list) {		if (!strcmp(list->namespace, namespace))			return true;	} 	return false;} static void add_namespace(struct list_head *head, const char *namespace){	struct namespace_list *ns_entry; 	if (!contains_namespace(head, namespace)) {		ns_entry = xmalloc(sizeof(*ns_entry) + strlen(namespace) + 1);		strcpy(ns_entry->namespace, namespace);		list_add_tail(&ns_entry->list, head);	}} static void *sym_get_data_by_offset(const struct elf_info *info,				    unsigned int secindex, unsigned long offset){	Elf_Shdr *sechdr = &info->sechdrs[secindex]; 	return (void *)info->hdr + sechdr->sh_offset + offset;} void *sym_get_data(const struct elf_info *info, const Elf_Sym *sym){	return sym_get_data_by_offset(info, get_secindex(info, sym),				      sym->st_value);} static const char *sech_name(const struct elf_info *info, Elf_Shdr *sechdr){	return sym_get_data_by_offset(info, info->secindex_strings,				      sechdr->sh_name);} static const char *sec_name(const struct elf_info *info, unsigned int secindex){	/*	 * If sym->st_shndx is a special section index, there is no	 * corresponding section header.	 * Return "" if the index is out of range of info->sechdrs[] array.	 */	if (secindex >= info->num_sections)		return ""; 	return sech_name(info, &info->sechdrs[secindex]);} static struct symbol *sym_add_exported(const char *name, struct module *mod,				       bool gpl_only, const char *namespace){	struct symbol *s = find_symbol(name); 	if (s && (!external_module || s->module->is_vmlinux || s->module == mod)) {		error("%s: '%s' exported twice. Previous export was in %s%s\n",		      mod->name, name, s->module->name,		      s->module->is_vmlinux ? "" : ".ko");	} 	s = alloc_symbol(name);	s->module = mod;	s->is_gpl_only = gpl_only;	s->namespace = xstrdup(namespace);	list_add_tail(&s->list, &mod->exported_symbols);	hash_add_symbol(s); 	return s;} static void sym_set_crc(struct symbol *sym, unsigned int crc){	sym->crc = crc;	sym->crc_valid = true;} static void *grab_file(const char *filename, size_t *size){	struct stat st;	void *map = MAP_FAILED;	int fd; 	fd = open(filename, O_RDONLY);	if (fd < 0)		return NULL;	if (fstat(fd, &st))		goto failed; 	*size = st.st_size;	map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); failed:	close(fd);	if (map == MAP_FAILED)		return NULL;	return map;} static void release_file(void *file, size_t size){	munmap(file, size);} static int parse_elf(struct elf_info *info, const char *filename){	unsigned int i;	Elf_Ehdr *hdr;	Elf_Shdr *sechdrs;	Elf_Sym  *sym;	const char *secstrings;	unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U; 	hdr = grab_file(filename, &info->size);	if (!hdr) {		if (ignore_missing_files) {			fprintf(stderr, "%s: %s (ignored)\n", filename,				strerror(errno));			return 0;		}		perror(filename);		exit(1);	}	info->hdr = hdr;	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;	} 	switch (hdr->e_ident[EI_DATA]) {	case ELFDATA2LSB:		target_is_big_endian = false;		break;	case ELFDATA2MSB:		target_is_big_endian = true;		break;	default:		fatal("target endian is unknown\n");	} 	/* Fix endianness in ELF header */	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);	sechdrs = (void *)hdr + hdr->e_shoff;	info->sechdrs = sechdrs; 	/* modpost only works for relocatable objects */	if (hdr->e_type != ET_REL)		fatal("%s: not relocatable object.", filename); 	/* Check if file offset is correct */	if (hdr->e_shoff > info->size)		fatal("section header offset=%lu in file '%s' is bigger than filesize=%zu\n",		      (unsigned long)hdr->e_shoff, filename, info->size); 	if (hdr->e_shnum == SHN_UNDEF) {		/*		 * There are more than 64k sections,		 * read count from .sh_size.		 */		info->num_sections = TO_NATIVE(sechdrs[0].sh_size);	}	else {		info->num_sections = hdr->e_shnum;	}	if (hdr->e_shstrndx == SHN_XINDEX) {		info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link);	}	else {		info->secindex_strings = hdr->e_shstrndx;	} 	/* Fix endianness in section headers */	for (i = 0; i < info->num_sections; i++) {		sechdrs[i].sh_name      = TO_NATIVE(sechdrs[i].sh_name);		sechdrs[i].sh_type      = TO_NATIVE(sechdrs[i].sh_type);

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