linux-kernel - [RFC PATCH 1/2] ima: don't access a file's integrity status before an IMA policy is loaded

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Message-Id: <20210319200358.22816-1-zohar@linux.ibm.com>
Date:   Fri, 19 Mar 2021 16:03:57 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     linux-integrity@...r.kernel.org, Test <test@...alhost.localdomain>,
        James Morris <jmorris@...ei.org>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Eric Biggers <ebiggers@...nel.org>,
        Mimi Zohar <zohar@...ux.ibm.com>
Subject: [RFC PATCH 1/2] ima: don't access a file's integrity status before an IMA policy is loaded

From: Test <test@...alhost.localdomain>

Only after an IMA policy is loaded, check, save, or update the cached
file's integrity status.

Signed-off-by: Mimi Zohar <zohar@...ux.ibm.com>
---
 security/integrity/ima/ima_main.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 9ef748ea829f..9d1196f712e1 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -606,6 +606,9 @@ void ima_post_create_tmpfile(struct user_namespace *mnt_userns,
 	struct integrity_iint_cache *iint;
 	int must_appraise;
 
+	if (!ima_policy_flag || !S_ISREG(inode->i_mode))
+		return;
+
 	must_appraise = ima_must_appraise(mnt_userns, inode, MAY_ACCESS,
 					  FILE_CHECK);
 	if (!must_appraise)
@@ -636,6 +639,9 @@ void ima_post_path_mknod(struct user_namespace *mnt_userns,
 	struct inode *inode = dentry->d_inode;
 	int must_appraise;
 
+	if (!ima_policy_flag || !S_ISREG(inode->i_mode))
+		return;
+
 	must_appraise = ima_must_appraise(mnt_userns, inode, MAY_ACCESS,
 					  FILE_CHECK);
 	if (!must_appraise)
-- 
2.27.0