linux-kernel - [PATCH v2 3/3] IMA: Support early boot measurement of critical data

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Message-Id: <20200828160021.11537-4-nramas@linux.microsoft.com>
Date:   Fri, 28 Aug 2020 09:00:21 -0700
From:   Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
To:     zohar@...ux.ibm.com, stephen.smalley.work@...il.com,
        casey@...aufler-ca.com
Cc:     tyhicks@...ux.microsoft.com, tusharsu@...ux.microsoft.com,
        sashal@...nel.org, jmorris@...ei.org,
        linux-integrity@...r.kernel.org, selinux@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/3] IMA: Support early boot measurement of critical data

The IMA hook, namely ima_measure_critical_data(), to measure kernel
critical data requires a custom IMA policy to be loaded.

Update ima_measure_critical_data() to utilize early boot measurement
support to defer processing data if a custom IMA policy is not yet
loaded.

Signed-off-by: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
---
 security/integrity/ima/ima_main.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 41be4d1d839e..ce0ef310c575 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -885,12 +885,22 @@ int ima_measure_critical_data(const char *event_name,
 			      const void *buf, int buf_len,
 			      bool measure_buf_hash)
 {
+	bool queued = false;
+
 	if (!event_name || !event_data_source || !buf || !buf_len)
 		return -EINVAL;
 
 	if (!ima_kernel_data_source_is_supported(event_data_source))
 		return -EPERM;
 
+	if (ima_should_queue_data())
+		queued = ima_queue_data(event_name, buf, buf_len,
+					event_data_source, CRITICAL_DATA,
+					measure_buf_hash);
+
+	if (queued)
+		return 0;
+
 	return process_buffer_measurement(NULL, buf, buf_len, event_name,
 					  CRITICAL_DATA, 0, event_data_source,
 					  measure_buf_hash);
-- 
2.28.0