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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>
This commit is contained in:
Kees Cook 2017-04-21 15:35:26 -07:00 committed by Jessica Yu
parent 08332893e3
commit 4901942696
1 changed files with 10 additions and 12 deletions
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22
kernel/module.c
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@ -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 @@ bad_version:
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;