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Date: Mon, 27 Apr 2020 12:31:28 +0200 From: Roberto Sassu <roberto.sassu@...wei.com> To: <zohar@...ux.ibm.com>, <rgoldwyn@...e.de> CC: <linux-integrity@...r.kernel.org>, <linux-security-module@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <silviu.vlasceanu@...wei.com>, <krzysztof.struczynski@...wei.com>, "Roberto Sassu" <roberto.sassu@...wei.com>, <stable@...r.kernel.org> Subject: [PATCH v2 6/6] ima: Fix return value of ima_write_policy() 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. Changelog v1: - deny the operation in all cases (suggested by Mimi, Krzysztof) Cc: stable@...r.kernel.org # 4.10.x Fixes: 19f8a84713edc ("ima: measure and appraise the IMA policy itself") Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com> --- security/integrity/ima/ima_fs.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c index 8b030a1c5e0d..e3fcad871861 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -338,8 +338,7 @@ 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); } -- 2.17.1
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