linux-kernel - [PATCH v9 1/6] IMA: Check IMA policy flag

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Message-Id: <20191127015654.3744-2-nramas@linux.microsoft.com>
Date:   Tue, 26 Nov 2019 17:56:49 -0800
From:   Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
To:     zohar@...ux.ibm.com, linux-integrity@...r.kernel.org
Cc:     eric.snowberg@...cle.com, dhowells@...hat.com,
        matthewgarrett@...gle.com, sashal@...nel.org,
        jamorris@...ux.microsoft.com, linux-kernel@...r.kernel.org,
        keyrings@...r.kernel.org
Subject: [PATCH v9 1/6] IMA: Check IMA policy flag

Return immediately from process_buffer_measurement()
if the IMA policy flag is set to zero. Not doing this
can result in kernel panic when process_buffer_measurement()
is called before IMA is initialized (for instance, when
the IMA hook is called when a key is added to
the .builtin_trusted_keys keyring).

This change adds the check in process_buffer_measurement()
to return immediately if ima_policy_flag is set to zero.

Signed-off-by: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
---
 security/integrity/ima/ima_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index d7e987baf127..9b35db2fc777 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -655,6 +655,9 @@ void process_buffer_measurement(const void *buf, int size,
 	int action = 0;
 	u32 secid;
 
+	if (!ima_policy_flag)
+		return;
+
 	/*
 	 * Both LSM hooks and auxilary based buffer measurements are
 	 * based on policy.  To avoid code duplication, differentiate
-- 
2.17.1