module: Pass struct load_info into symbol checks
Since we're already using values from struct load_info, just pass this
pointer in directly and use what's needed as we need it. This allows us
to access future fields in struct load_info too.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jessica Yu <jeyu@redhat.com>
diff --git a/kernel/module.c b/kernel/module.c
index 4a3665f..ca4509b 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1278,12 +1278,13 @@ static u32 resolve_rel_crc(const s32 *crc)
return *(u32 *)((void *)crc + *crc);
}
-static int check_version(Elf_Shdr *sechdrs,
- unsigned int versindex,
+static int check_version(const struct load_info *info,
const char *symname,
struct module *mod,
const s32 *crc)
{
+ Elf_Shdr *sechdrs = info->sechdrs;
+ unsigned int versindex = info->index.vers;
unsigned int i, num_versions;
struct modversion_info *versions;
@@ -1326,8 +1327,7 @@ static int check_version(Elf_Shdr *sechdrs,
return 0;
}
-static inline int check_modstruct_version(Elf_Shdr *sechdrs,
- unsigned int versindex,
+static inline int check_modstruct_version(const struct load_info *info,
struct module *mod)
{
const s32 *crc;
@@ -1343,8 +1343,8 @@ static inline int check_modstruct_version(Elf_Shdr *sechdrs,
BUG();
}
preempt_enable();
- return check_version(sechdrs, versindex,
- VMLINUX_SYMBOL_STR(module_layout), mod, crc);
+ return check_version(info, VMLINUX_SYMBOL_STR(module_layout),
+ mod, crc);
}
/* First part is kernel version, which we ignore if module has crcs. */
@@ -1358,8 +1358,7 @@ static inline int same_magic(const char *amagic, const char *bmagic,
return strcmp(amagic, bmagic) == 0;
}
#else
-static inline int check_version(Elf_Shdr *sechdrs,
- unsigned int versindex,
+static inline int check_version(const struct load_info *info,
const char *symname,
struct module *mod,
const s32 *crc)
@@ -1367,8 +1366,7 @@ static inline int check_version(Elf_Shdr *sechdrs,
return 1;
}
-static inline int check_modstruct_version(Elf_Shdr *sechdrs,
- unsigned int versindex,
+static inline int check_modstruct_version(const struct load_info *info,
struct module *mod)
{
return 1;
@@ -1404,7 +1402,7 @@ static const struct kernel_symbol *resolve_symbol(struct module *mod,
if (!sym)
goto unlock;
- if (!check_version(info->sechdrs, info->index.vers, name, mod, crc)) {
+ if (!check_version(info, name, mod, crc)) {
sym = ERR_PTR(-EINVAL);
goto getname;
}
@@ -2971,7 +2969,7 @@ static struct module *setup_load_info(struct load_info *info, int flags)
info->index.pcpu = find_pcpusec(info);
/* Check module struct version now, before we try to use module. */
- if (!check_modstruct_version(info->sechdrs, info->index.vers, mod))
+ if (!check_modstruct_version(info, mod))
return ERR_PTR(-ENOEXEC);
return mod;