[PATCH 5.4 194/261] ima: Set again build_ima_appraise variable

[Greg Kroah-Hartman]

From: Krzysztof Struczynski <krzysztof.struczynski@xxxxxxxxxx>

[ Upstream commit b59fda449cf07f2db3be3a67142e6c000f5e8d79 ]

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.

Cc: stable@xxxxxxxxxxxxxxx # 5.0.x
Fixes: c52657d93b05 ("ima: refactor ima_init_policy()")
Co-developed-by: Roberto Sassu <roberto.sassu@xxxxxxxxxx>
Signed-off-by: Roberto Sassu <roberto.sassu@xxxxxxxxxx>
Signed-off-by: Krzysztof Struczynski <krzysztof.struczynski@xxxxxxxxxx>
Signed-off-by: Mimi Zohar <zohar@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 86624b1331ef..558a7607bf93 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -590,8 +590,14 @@ 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);
+		}
 	}
 }
 
-- 
2.25.1