kernel/module/kallsyms.c

25 		       const struct module *mod)
29 	if (!mod)
32 		ks = lookup_exported_symbol(name, mod->syms, mod->syms + mod->num_syms);
113 void layout_symtab(struct module *mod, struct load_info *info)
119 	struct module_memory *mod_mem_data = &mod->mem[MOD_DATA];
120 	struct module_memory *mod_mem_init_data = &mod->mem[MOD_INIT_DATA];
124 	symsect->sh_entsize = module_get_offset_and_type(mod, MOD_INIT_DATA,
133 		if (i == 0 || is_livepatch_module(mod) ||
151 	strsect->sh_entsize = module_get_offset_and_type(mod, MOD_INIT_DATA,
170 void add_kallsyms(struct module *mod, const struct load_info *info)
178 	void *data_base = mod->mem[MOD_DATA].base;
179 	void *init_data_base = mod->mem[MOD_INIT_DATA].base;
182 	mod->kallsyms = (void __rcu *)init_data_base +
187 	rcu_dereference(mod->kallsyms)->symtab = (void *)symsec->sh_addr;
188 	rcu_dereference(mod->kallsyms)->num_symtab = symsec->sh_size / sizeof(Elf_Sym);
190 	rcu_dereference(mod->kallsyms)->strtab =
192 	rcu_dereference(mod->kallsyms)->typetab = init_data_base + info->init_typeoffs;
198 	mod->core_kallsyms.symtab = dst = data_base + info->symoffs;
199 	mod->core_kallsyms.strtab = s = data_base + info->stroffs;
200 	mod->core_kallsyms.typetab = data_base + info->core_typeoffs;
202 	src = rcu_dereference(mod->kallsyms)->symtab;
203 	for (ndst = i = 0; i < rcu_dereference(mod->kallsyms)->num_symtab; i++) {
204 		rcu_dereference(mod->kallsyms)->typetab[i] = elf_type(src + i, info);
205 		if (i == 0 || is_livepatch_module(mod) ||
210 			mod->core_kallsyms.typetab[ndst] =
211 			    rcu_dereference(mod->kallsyms)->typetab[i];
213 			dst[ndst++].st_name = s - mod->core_kallsyms.strtab;
215 				      &rcu_dereference(mod->kallsyms)->strtab[src[i].st_name],
224 	mod->core_kallsyms.num_symtab = ndst;
228 void init_build_id(struct module *mod, const struct load_info *info)
236 		    !build_id_parse_buf((void *)sechdr->sh_addr, mod->build_id,
242 void init_build_id(struct module *mod, const struct load_info *info)
256 static const char *find_kallsyms_symbol(struct module *mod,
263 	struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms);
267 	if (within_module_init(addr, mod))
268 		mod_mem = &mod->mem[MOD_INIT_TEXT];
270 		mod_mem = &mod->mem[MOD_TEXT];
314 void * __weak dereference_module_function_descriptor(struct module *mod,
332 	struct module *mod;
335 	mod = __module_address(addr);
336 	if (mod) {
338 			*modname = mod->name;
341 			*modbuildid = mod->build_id;
347 		ret = find_kallsyms_symbol(mod, addr, size, offset);
361 	struct module *mod;
364 	list_for_each_entry_rcu(mod, &modules, list) {
365 		if (mod->state == MODULE_STATE_UNFORMED)
367 		if (within_module(addr, mod)) {
370 			sym = find_kallsyms_symbol(mod, addr, NULL, NULL);
387 	struct module *mod;
390 	list_for_each_entry_rcu(mod, &modules, list) {
393 		if (mod->state == MODULE_STATE_UNFORMED)
395 		kallsyms = rcu_dereference_sched(mod->kallsyms);
402 			strscpy(module_name, mod->name, MODULE_NAME_LEN);
403 			*exported = is_exported(name, *value, mod);
414 static unsigned long __find_kallsyms_symbol_value(struct module *mod, const char *name)
417 	struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms);
431 	struct module *mod;
436 		mod = find_module_all(name, colon - name, false);
437 		if (mod)
438 			return __find_kallsyms_symbol_value(mod, colon + 1);
442 	list_for_each_entry_rcu(mod, &modules, list) {
445 		if (mod->state == MODULE_STATE_UNFORMED)
447 		ret = __find_kallsyms_symbol_value(mod, name);
466 unsigned long find_kallsyms_symbol_value(struct module *mod, const char *name)
471 	ret = __find_kallsyms_symbol_value(mod, name);
480 	struct module *mod;
485 	list_for_each_entry(mod, &modules, list) {
488 		if (mod->state == MODULE_STATE_UNFORMED)
491 		if (modname && strcmp(modname, mod->name))
496 		kallsyms = rcu_dereference_sched(mod->kallsyms);