The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From b59fda449cf07f2db3be3a67142e6c000f5e8d79 Mon Sep 17 00:00:00 2001

From: Krzysztof Struczynski krzysztof.struczynski@huawei.com Date: Mon, 27 Apr 2020 12:28:59 +0200 Subject: [PATCH] ima: Set again build_ima_appraise variable

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@vger.kernel.org # 5.0.x Fixes: c52657d93b05 ("ima: refactor ima_init_policy()") Co-developed-by: Roberto Sassu roberto.sassu@huawei.com Signed-off-by: Roberto Sassu roberto.sassu@huawei.com Signed-off-by: Krzysztof Struczynski krzysztof.struczynski@huawei.com Signed-off-by: Mimi Zohar zohar@linux.ibm.com

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); + } } }