From b36f281f4a314de4be0a51d6511b794691f8a244 Mon Sep 17 00:00:00 2001
From: Mimi Zohar <zohar@linux.ibm.com>
Date: Fri, 19 Jul 2019 07:16:57 -0400
Subject: [PATCH] ima: initialize the "template" field with the default template
Git-commit: b36f281f4a314de4be0a51d6511b794691f8a244
Patch-mainline: v5.4-rc1
References: git-fixes
IMA policy rules are walked sequentially. Depending on the ordering of
the policy rules, the "template" field might be defined in one rule, but
will be replaced by subsequent, applicable rules, even if the rule does
not explicitly define the "template" field.
This patch initializes the "template" once and only replaces the
"template", when explicitly defined.
Fixes: 19453ce0bcfb ("IMA: support for per policy rule template formats")
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
security/integrity/ima/ima_policy.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 6df7f641ff66..36a0727f1d7a 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -491,6 +491,9 @@ int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
struct ima_rule_entry *entry;
int action = 0, actmask = flags | (flags << 1);
+ if (template_desc)
+ *template_desc = ima_template_desc_current();
+
rcu_read_lock();
list_for_each_entry_rcu(entry, ima_rules, list) {
@@ -510,6 +513,7 @@ int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
action |= IMA_FAIL_UNVERIFIABLE_SIGS;
}
+
if (entry->action & IMA_DO_MASK)
actmask &= ~(entry->action | entry->action << 1);
else
@@ -520,8 +524,6 @@ int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
if (template_desc && entry->template)
*template_desc = entry->template;
- else if (template_desc)
- *template_desc = ima_template_desc_current();
if (!actmask)
break;
--
2.16.4