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| author | Sasha Levin <sasha.levin@oracle.com> | 2015-12-22 14:51:23 +0100 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.vnet.ibm.com> | 2015-12-25 00:56:45 +0100 |
| commit | 0112721df4edbdd07b800813300d76811572f080 (patch) | |
| tree | 9ad07cfcfdd6aedb1c0764187b95646d05b83b1a /security/integrity/ima/ima_policy.c | |
| parent | security/integrity: make ima/ima_mok.c explicitly non-modular (diff) | |
| download | linux-0112721df4edbdd07b800813300d76811572f080.tar.xz linux-0112721df4edbdd07b800813300d76811572f080.zip | |
IMA: policy can be updated zero times
Commit "IMA: policy can now be updated multiple times" assumed that the
policy would be updated at least once.
If there are zero updates, the temporary list head object will get added
to the policy list, and later dereferenced as an IMA policy object, which
means that invalid memory will be accessed.
Changelog:
- Move list_empty() test to ima_release_policy(), before audit msg - Mimi
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Diffstat (limited to 'security/integrity/ima/ima_policy.c')
| -rw-r--r-- | security/integrity/ima/ima_policy.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index ba5d2fc61394..0a3b781f18e5 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -416,6 +416,14 @@ void __init ima_init_policy(void) ima_rules = &ima_default_rules; } +/* Make sure we have a valid policy, at least containing some rules. */ +int ima_check_policy() +{ + if (list_empty(&ima_temp_rules)) + return -EINVAL; + return 0; +} + /** * ima_update_policy - update default_rules with new measure rules * |