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From: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
To: zohar@linux.ibm.com, linux-integrity@vger.kernel.org
Cc: eric.snowberg@oracle.com, dhowells@redhat.com,
	mathew.j.martineau@linux.intel.com, matthewgarrett@google.com,
	sashal@kernel.org, jamorris@linux.microsoft.com,
	linux-kernel@vger.kernel.org, keyrings@vger.kernel.org
Subject: [PATCH v10 1/6] IMA: Check IMA policy flag
Date: Wed,  4 Dec 2019 14:41:26 -0800
Message-ID: <20191204224131.3384-2-nramas@linux.microsoft.com> (raw)
In-Reply-To: <20191204224131.3384-1-nramas@linux.microsoft.com>

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@linux.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


  reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-04 22:41 [PATCH v10 0/6] KEYS: Measure keys when they are created or updated Lakshmi Ramasubramanian
2019-12-04 22:41 ` Lakshmi Ramasubramanian [this message]
2019-12-10 22:42   ` [PATCH v10 1/6] IMA: Check IMA policy flag Mimi Zohar
2019-12-10 23:29     ` Lakshmi Ramasubramanian
2019-12-11  0:03       ` Mimi Zohar
2019-12-04 22:41 ` [PATCH v10 2/6] IMA: Add KEY_CHECK func to measure keys Lakshmi Ramasubramanian
2019-12-04 22:41 ` [PATCH v10 3/6] IMA: Define an IMA hook " Lakshmi Ramasubramanian
2019-12-10 22:42   ` Mimi Zohar
2019-12-04 22:41 ` [PATCH v10 4/6] KEYS: Call the " Lakshmi Ramasubramanian
2019-12-10 22:43   ` Mimi Zohar
2019-12-04 22:41 ` [PATCH v10 5/6] IMA: Add support to limit measuring keys Lakshmi Ramasubramanian
2019-12-10 22:43   ` Mimi Zohar
2019-12-10 23:23     ` Lakshmi Ramasubramanian
2019-12-04 22:41 ` [PATCH v10 6/6] IMA: Read keyrings= option from the IMA policy Lakshmi Ramasubramanian
2019-12-10 22:43   ` Mimi Zohar

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