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ima: Fix return value of ima_write_policy()

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[ Upstream commit 2e3a34e9f409ebe83d1af7cd2f49fca7af97dfac ]

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: 19f8a84713 ("ima: measure and appraise the IMA policy itself")
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Krzysztof Struczynski <krzysztof.struczynski@huawei.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Roberto Sassu 2020-04-27 12:31:28 +02:00 • committed by Greg Kroah-Hartman
commit 657a03ff6c
1 changed files with 1 additions and 2 deletions
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3
security/integrity/ima/ima_fs.c
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@ -343,8 +343,7 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf,
integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL,
"policy_update", "signed policy required",
1, 0);
if (ima_appraise & IMA_APPRAISE_ENFORCE)
result = -EACCES;
result = -EACCES;
} else {
result = ima_parse_add_rule(data);
}