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| author | Daniel Glöckner <dg@emlix.com> | 2017-02-24 15:05:14 +0100 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.vnet.ibm.com> | 2017-03-07 07:06:10 -0500 |
| commit | 1ac202e978e18f045006d75bd549612620c6ec3a (patch) | |
| tree | 2ba303f2bf2a26ecc6defdd021696154f0b47869 /security/integrity | |
| parent | bad4417b692ede5cf31105b329cea1544875b526 (diff) | |
| download | linux-exynos-1ac202e978e18f045006d75bd549612620c6ec3a.tar.gz linux-exynos-1ac202e978e18f045006d75bd549612620c6ec3a.tar.bz2 linux-exynos-1ac202e978e18f045006d75bd549612620c6ec3a.zip | |
ima: accept previously set IMA_NEW_FILE
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>
Diffstat (limited to 'security/integrity')
| -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 1fd9539a969d..5d0785cfe063 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -207,10 +207,11 @@ int ima_appraise_measurement(enum ima_hooks func, 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; } |