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apparmor: fix SECURITY_APPARMOR_HASH_DEFAULT parameter handling 

The newly added Kconfig option could never work and just causes a build error
when disabled:

security/apparmor/lsm.c:675:25: error: 'CONFIG_SECURITY_APPARMOR_HASH_DEFAULT' undeclared here (not in a function)
 bool aa_g_hash_policy = CONFIG_SECURITY_APPARMOR_HASH_DEFAULT;

The problem is that the macro undefined in this case, and we need to use the IS_ENABLED()
helper to turn it into a boolean constant.

Another minor problem with the original patch is that the option is even offered
in sysfs when SECURITY_APPARMOR_HASH is not enabled, so this also hides the option
in that case.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 6059f71f1e ("apparmor: add parameter to control whether policy hashing is used")
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
This commit is contained in:
Arnd Bergmann 2016-07-25 10:59:07 -07:00 committed by James Morris
parent 82cc1a49b6
commit 7616ac70d1
3 changed files with 7 additions and 3 deletions
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3
security/apparmor/crypto.c
View File

@ -39,6 +39,9 @@ int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
int error = -ENOMEM;
u32 le32_version = cpu_to_le32(version);
if (!aa_g_hash_policy)
return 0;
if (!apparmor_tfm)
return 0;

4
security/apparmor/lsm.c
View File

@ -671,9 +671,11 @@ enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
module_param_call(mode, param_set_mode, param_get_mode,
&aa_g_profile_mode, S_IRUSR | S_IWUSR);
#ifdef CONFIG_SECURITY_APPARMOR_HASH
/* whether policy verification hashing is enabled */
bool aa_g_hash_policy = CONFIG_SECURITY_APPARMOR_HASH_DEFAULT;
bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT);
module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR);
#endif
/* Debug mode */
bool aa_g_debug;

3
security/apparmor/policy_unpack.c
View File

@ -778,8 +778,7 @@ int aa_unpack(void *udata, size_t size, struct list_head *lh, const char **ns)
if (error)
goto fail_profile;
if (aa_g_hash_policy)
error = aa_calc_profile_hash(profile, e.version, start,
error = aa_calc_profile_hash(profile, e.version, start,
e.pos - start);
if (error)
goto fail_profile;