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authorRoberto Sassu <roberto.sassu@huawei.com>2017-11-07 11:37:07 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-11-24 08:33:41 +0100
commit2cfbb32f6ccb8910418d447fabd0420fba4de825 (patch)
tree4a4d0e0127db06a7c482e58888fd1a64405a5a64 /security
parentaa15fe4d6a7f34b76b562cff5f4c4b86663e83d9 (diff)
ima: do not update security.ima if appraisal status is not INTEGRITY_PASS
commit 020aae3ee58c1af0e7ffc4e2cc9fe4dc630338cb upstream. Commit b65a9cfc2c38 ("Untangling ima mess, part 2: deal with counters") moved the call of ima_file_check() from may_open() to do_filp_open() at a point where the file descriptor is already opened. This breaks the assumption made by IMA that file descriptors being closed belong to files whose access was granted by ima_file_check(). The consequence is that security.ima and security.evm are updated with good values, regardless of the current appraisal status. For example, if a file does not have security.ima, IMA will create it after opening the file for writing, even if access is denied. Access to the file will be allowed afterwards. Avoid this issue by checking the appraisal status before updating security.ima. Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com> Signed-off-by: James Morris <james.l.morris@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'security')
-rw-r--r--security/integrity/ima/ima_appraise.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index 097459830454..6830d2427e47 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -303,6 +303,9 @@ void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file)
if (iint->flags & IMA_DIGSIG)
return;
+ if (iint->ima_file_status != INTEGRITY_PASS)
+ return;
+
rc = ima_collect_measurement(iint, file, NULL, 0, ima_hash_algo);
if (rc < 0)
return;