diff options
| author | Daniel Glöckner <dg@emlix.com> | 2017-02-24 15:05:14 +0100 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2017-08-26 02:14:23 +0100 |
| commit | b297f0a2297c79a72ea456ac6aa291c6245d6746 (patch) | |
| tree | 3e9ace6dcc631058c5f5a03619fd9b7953545f0d /security | |
| parent | ad4b000f037c80628e1ecfcc8b782eb2bdec49ca (diff) | |
ima: accept previously set IMA_NEW_FILE
commit 1ac202e978e18f045006d75bd549612620c6ec3a upstream.
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>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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 777a6b4bd8ba..28aee9eb8b32 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -195,10 +195,11 @@ 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; } |