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Modules updates for v4.13
Summary of modules changes for the 4.13 merge window:
- Minor code cleanups
- Avoid accessing mod struct prior to checking module struct version, from Kees
- Fix racy atomic inc/dec logic of kmod_concurrent_max in kmod, from Luis
Signed-off-by: Jessica Yu <jeyu@kernel.org>
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Merge tag 'modules-for-v4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux
Pull modules updates from Jessica Yu:
"Summary of modules changes for the 4.13 merge window:
- Minor code cleanups
- Avoid accessing mod struct prior to checking module struct version,
from Kees
- Fix racy atomic inc/dec logic of kmod_concurrent_max in kmod, from
Luis"
* tag 'modules-for-v4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux:
module: make the modinfo name const
kmod: reduce atomic operations on kmod_concurrent and simplify
module: use list_for_each_entry_rcu() on find_module_all()
kernel/module.c: suppress warning about unused nowarn variable
module: Add module name to modinfo
module: Pass struct load_info into symbol checks
This commit is contained in:
Linus Torvalds
commit
3a75ad1457
3 changed files with 80 additions and 60 deletions
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@ -300,6 +300,7 @@ int unregister_module_notifier(struct notifier_block *nb)
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EXPORT_SYMBOL(unregister_module_notifier);
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struct load_info {
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const char *name;
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Elf_Ehdr *hdr;
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unsigned long len;
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Elf_Shdr *sechdrs;
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@ -600,7 +601,7 @@ static struct module *find_module_all(const char *name, size_t len,
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module_assert_mutex_or_preempt();
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list_for_each_entry(mod, &modules, list) {
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list_for_each_entry_rcu(mod, &modules, list) {
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if (!even_unformed && mod->state == MODULE_STATE_UNFORMED)
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continue;
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if (strlen(mod->name) == len && !memcmp(mod->name, name, len))
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@ -1273,12 +1274,13 @@ static u32 resolve_rel_crc(const s32 *crc)
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return *(u32 *)((void *)crc + *crc);
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}
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static int check_version(Elf_Shdr *sechdrs,
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unsigned int versindex,
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static int check_version(const struct load_info *info,
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const char *symname,
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struct module *mod,
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const s32 *crc)
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{
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Elf_Shdr *sechdrs = info->sechdrs;
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unsigned int versindex = info->index.vers;
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unsigned int i, num_versions;
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struct modversion_info *versions;
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@ -1312,17 +1314,16 @@ static int check_version(Elf_Shdr *sechdrs,
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}
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/* Broken toolchain. Warn once, then let it go.. */
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pr_warn_once("%s: no symbol version for %s\n", mod->name, symname);
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pr_warn_once("%s: no symbol version for %s\n", info->name, symname);
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return 1;
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bad_version:
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pr_warn("%s: disagrees about version of symbol %s\n",
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mod->name, symname);
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info->name, symname);
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return 0;
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}
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static inline int check_modstruct_version(Elf_Shdr *sechdrs,
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unsigned int versindex,
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static inline int check_modstruct_version(const struct load_info *info,
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struct module *mod)
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{
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const s32 *crc;
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@ -1338,8 +1339,8 @@ static inline int check_modstruct_version(Elf_Shdr *sechdrs,
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BUG();
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}
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preempt_enable();
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return check_version(sechdrs, versindex,
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VMLINUX_SYMBOL_STR(module_layout), mod, crc);
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return check_version(info, VMLINUX_SYMBOL_STR(module_layout),
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mod, crc);
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}
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/* First part is kernel version, which we ignore if module has crcs. */
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@ -1353,8 +1354,7 @@ static inline int same_magic(const char *amagic, const char *bmagic,
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return strcmp(amagic, bmagic) == 0;
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}
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#else
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static inline int check_version(Elf_Shdr *sechdrs,
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unsigned int versindex,
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static inline int check_version(const struct load_info *info,
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const char *symname,
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struct module *mod,
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const s32 *crc)
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@ -1362,8 +1362,7 @@ static inline int check_version(Elf_Shdr *sechdrs,
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return 1;
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}
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static inline int check_modstruct_version(Elf_Shdr *sechdrs,
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unsigned int versindex,
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static inline int check_modstruct_version(const struct load_info *info,
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struct module *mod)
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{
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return 1;
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@ -1399,7 +1398,7 @@ static const struct kernel_symbol *resolve_symbol(struct module *mod,
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if (!sym)
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goto unlock;
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if (!check_version(info->sechdrs, info->index.vers, name, mod, crc)) {
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if (!check_version(info, name, mod, crc)) {
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sym = ERR_PTR(-EINVAL);
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goto getname;
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}
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@ -1662,21 +1661,6 @@ static inline void remove_notes_attrs(struct module *mod)
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}
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#endif /* CONFIG_KALLSYMS */
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static void add_usage_links(struct module *mod)
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{
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#ifdef CONFIG_MODULE_UNLOAD
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struct module_use *use;
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int nowarn;
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mutex_lock(&module_mutex);
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list_for_each_entry(use, &mod->target_list, target_list) {
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nowarn = sysfs_create_link(use->target->holders_dir,
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&mod->mkobj.kobj, mod->name);
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}
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mutex_unlock(&module_mutex);
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#endif
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}
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static void del_usage_links(struct module *mod)
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{
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#ifdef CONFIG_MODULE_UNLOAD
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@ -1689,6 +1673,26 @@ static void del_usage_links(struct module *mod)
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#endif
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}
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static int add_usage_links(struct module *mod)
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{
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int ret = 0;
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#ifdef CONFIG_MODULE_UNLOAD
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struct module_use *use;
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mutex_lock(&module_mutex);
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list_for_each_entry(use, &mod->target_list, target_list) {
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ret = sysfs_create_link(use->target->holders_dir,
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&mod->mkobj.kobj, mod->name);
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if (ret)
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break;
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}
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mutex_unlock(&module_mutex);
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if (ret)
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del_usage_links(mod);
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#endif
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return ret;
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}
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static int module_add_modinfo_attrs(struct module *mod)
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{
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struct module_attribute *attr;
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@ -1797,13 +1801,18 @@ static int mod_sysfs_setup(struct module *mod,
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if (err)
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goto out_unreg_param;
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add_usage_links(mod);
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err = add_usage_links(mod);
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if (err)
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goto out_unreg_modinfo_attrs;
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add_sect_attrs(mod, info);
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add_notes_attrs(mod, info);
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kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
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return 0;
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out_unreg_modinfo_attrs:
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module_remove_modinfo_attrs(mod);
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out_unreg_param:
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module_param_sysfs_remove(mod);
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out_unreg_holders:
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@ -2910,9 +2919,15 @@ static int rewrite_section_headers(struct load_info *info, int flags)
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info->index.vers = 0; /* Pretend no __versions section! */
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else
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info->index.vers = find_sec(info, "__versions");
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info->index.info = find_sec(info, ".modinfo");
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info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC;
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info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC;
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info->index.info = find_sec(info, ".modinfo");
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if (!info->index.info)
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info->name = "(missing .modinfo section)";
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else
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info->name = get_modinfo(info, "name");
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info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC;
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return 0;
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}
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@ -2952,21 +2967,29 @@ static struct module *setup_load_info(struct load_info *info, int flags)
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info->index.mod = find_sec(info, ".gnu.linkonce.this_module");
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if (!info->index.mod) {
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pr_warn("No module found in object\n");
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pr_warn("%s: No module found in object\n",
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info->name ?: "(missing .modinfo name field)");
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return ERR_PTR(-ENOEXEC);
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}
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/* This is temporary: point mod into copy of data. */
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mod = (void *)info->sechdrs[info->index.mod].sh_addr;
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/*
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* If we didn't load the .modinfo 'name' field, fall back to
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* on-disk struct mod 'name' field.
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*/
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if (!info->name)
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info->name = mod->name;
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if (info->index.sym == 0) {
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pr_warn("%s: module has no symbols (stripped?)\n", mod->name);
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pr_warn("%s: module has no symbols (stripped?)\n", info->name);
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return ERR_PTR(-ENOEXEC);
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}
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info->index.pcpu = find_pcpusec(info);
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/* Check module struct version now, before we try to use module. */
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if (!check_modstruct_version(info->sechdrs, info->index.vers, mod))
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if (!check_modstruct_version(info, mod))
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return ERR_PTR(-ENOEXEC);
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return mod;
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@ -2987,7 +3010,7 @@ static int check_modinfo(struct module *mod, struct load_info *info, int flags)
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return err;
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} else if (!same_magic(modmagic, vermagic, info->index.vers)) {
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pr_err("%s: version magic '%s' should be '%s'\n",
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mod->name, modmagic, vermagic);
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info->name, modmagic, vermagic);
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return -ENOEXEC;
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}
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@ -3237,7 +3260,7 @@ int __weak module_frob_arch_sections(Elf_Ehdr *hdr,
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/* module_blacklist is a comma-separated list of module names */
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static char *module_blacklist;
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static bool blacklisted(char *module_name)
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static bool blacklisted(const char *module_name)
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{
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const char *p;
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size_t len;
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@ -3267,7 +3290,7 @@ static struct module *layout_and_allocate(struct load_info *info, int flags)
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if (IS_ERR(mod))
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return mod;
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if (blacklisted(mod->name))
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if (blacklisted(info->name))
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return ERR_PTR(-EPERM);
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err = check_modinfo(mod, info, flags);
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