linux-kernel - [RFC][PATCH] ima: add default rule for initramfs files

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Date:	Tue,  6 Jul 2010 17:08:22 +0200
From:	Roberto Sassu <roberto.sassu@...ito.it>
To:	linux-kernel@...r.kernel.org
Cc:	linux-security-module@...r.kernel.org,
	linux-ima-user@...ts.sourceforge.net,
	Roberto Sassu <roberto.sassu@...ito.it>
Subject: [RFC][PATCH] ima: add default rule for initramfs files

This patch modifies the default policy shipped with IMA, in order to avoid measurements
of files in the initial ramdisk. Those files can be measured early in the boot process
by the bootloader.
The patch applies to latest version of the mainline kernel 2.6.35-rc4.


Signed-off-by: Roberto Sassu <roberto.sassu@...ito.it>
---
 security/integrity/ima/ima_policy.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index aef8c0a..92d8d0e 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -64,6 +64,7 @@ static struct ima_measure_rule_entry default_rules[] = {
 	{.action = DONT_MEASURE,.fsmagic = TMPFS_MAGIC,.flags = IMA_FSMAGIC},
 	{.action = DONT_MEASURE,.fsmagic = SECURITYFS_MAGIC,.flags = IMA_FSMAGIC},
 	{.action = DONT_MEASURE,.fsmagic = SELINUX_MAGIC,.flags = IMA_FSMAGIC},
+	{.action = DONT_MEASURE,.fsmagic = RAMFS_MAGIC,.flags = IMA_FSMAGIC},
 	{.action = MEASURE,.func = FILE_MMAP,.mask = MAY_EXEC,
 	 .flags = IMA_FUNC | IMA_MASK},
 	{.action = MEASURE,.func = BPRM_CHECK,.mask = MAY_EXEC,
-- 
1.7.1

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