diff options
| author | Daniel Glöckner <dg@emlix.com> | 2017-02-24 15:05:14 +0100 |
|---|---|---|
| committer | Sasha Levin <alexander.levin@verizon.com> | 2017-05-17 15:07:00 -0400 |
| commit | 9d3698c9b85c7f65148b97133c7918841a4fc25f (patch) | |
| tree | 2e2994dbe020386f538216cbbdfa6337648f223d /security | |
| parent | 86525f9f44749350e61f31fdcf9c6ea8408652a7 (diff) | |
ima: accept previously set IMA_NEW_FILE
[ Upstream commit 1ac202e978e18f045006d75bd549612620c6ec3a ]
Modifying the attributes of a file makes ima_inode_post_setattr reset
the IMA cache flags. So if the file, which has just been created,
is opened a second time before the first file descriptor is closed,
verification fails since the security.ima xattr has not been written
yet. We therefore have to look at the IMA_NEW_FILE even if the file
already existed.
With this patch there should no longer be an error when cat tries to
open testfile:
$ rm -f testfile
$ ( echo test >&3 ; touch testfile ; cat testfile ) 3>testfile
A file being new is no reason to accept that it is missing a digital
signature demanded by the policy.
Signed-off-by: Daniel Glöckner <dg@emlix.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Diffstat (limited to 'security')
| -rw-r--r-- | security/integrity/ima/ima_appraise.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c index 4df493e4b3c9..5970161625a5 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -203,10 +203,11 @@ int ima_appraise_measurement(int func, struct integrity_iint_cache *iint, cause = "missing-hash"; status = INTEGRITY_NOLABEL; - if (opened & FILE_CREATED) { + if (opened & FILE_CREATED) iint->flags |= IMA_NEW_FILE; + if ((iint->flags & IMA_NEW_FILE) && + !(iint->flags & IMA_DIGSIG_REQUIRED)) status = INTEGRITY_PASS; - } goto out; } |