ima: Fix return value of ima_write_policy()
Roberto Sassu authored
[ Upstream commit 2e3a34e9 ]

This patch fixes the return value of ima_write_policy() when a new policy
is directly passed to IMA and the current policy requires appraisal of the
file containing the policy. Currently, if appraisal is not in ENFORCE mode,
ima_write_policy() returns 0 and leads user space applications to an
endless loop. Fix this issue by denying the operation regardless of the
appraisal mode.

Cc: stable@vger.kernel.org # 4.10.x
Fixes: 19f8a847

 ("ima: measure and appraise the IMA policy itself")
Signed-off-by: default avatarRoberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: default avatarKrzysztof Struczynski <krzysztof.struczynski@huawei.com>
Signed-off-by: default avatarMimi Zohar <zohar@linux.ibm.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
fa63cb9b