linux-kernel - [PATCH v2 5/6] ima: Set again build_ima

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Message-ID: <20200427102900.18887-5-roberto.sassu@huawei.com>
Date:   Mon, 27 Apr 2020 12:28:59 +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>, <stable@...r.kernel.org>,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: [PATCH v2 5/6] ima: Set again build_ima_appraise variable

From: Krzysztof Struczynski <krzysztof.struczynski@...wei.com>

After adding the new add_rule() function in commit c52657d93b05
("ima: refactor ima_init_policy()"), all appraisal flags are added to the
temp_ima_appraise variable. Revert to the previous behavior instead of
removing build_ima_appraise, to benefit from the protection offered by
__ro_after_init.

The mentioned commit introduced a bug, as it makes all the flags
modifiable, while build_ima_appraise flags can be protected with
__ro_after_init.

Changelog

v1:
- set build_ima_appraise instead of removing it (suggested by Mimi)

Cc: stable@...r.kernel.org # 5.0.x
Fixes: c52657d93b05 ("ima: refactor ima_init_policy()")
Co-developed-by: Roberto Sassu <roberto.sassu@...wei.com>
Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
Signed-off-by: Krzysztof Struczynski <krzysztof.struczynski@...wei.com>
---
 security/integrity/ima/ima_policy.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index ea9b991f0232..ef7f68cc935e 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -643,8 +643,14 @@ static void add_rules(struct ima_rule_entry *entries, int count,
 
 			list_add_tail(&entry->list, &ima_policy_rules);
 		}
-		if (entries[i].action == APPRAISE)
-			temp_ima_appraise |= ima_appraise_flag(entries[i].func);
+		if (entries[i].action == APPRAISE) {
+			if (entries != build_appraise_rules)
+				temp_ima_appraise |=
+					ima_appraise_flag(entries[i].func);
+			else
+				build_ima_appraise |=
+					ima_appraise_flag(entries[i].func);
+		}
 	}
 }
 
-- 
2.17.1