linux-kernel - [PATCH 1/2] ima: detect security xattrs not enabled

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Message-Id: <1360681860-29045-2-git-send-email-vgoyal@redhat.com>
Date:	Tue, 12 Feb 2013 10:10:59 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	zohar@...ux.vnet.ibm.com, linux-security-module@...r.kernel.org
Cc:	vgoyal@...hat.com, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] ima: detect security xattrs not enabled

vfs_getxattr_alloc() returns -EOPNOTSUPP if filesystem does not have
security label enabled. In that case there is no point in continuing
further and try to fix hashes (if ima_appraise=fix was specified) as
that will fail too. Return early

Signed-off-by: Vivek Goyal <vgoyal@...hat.com>
Acked-by: Mimi Zohar <zohar@...ux.vnet.ibm.com>
---
 security/integrity/ima/ima_appraise.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index 2d4beca..3710f44 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -134,6 +134,10 @@ int ima_appraise_measurement(int func, struct integrity_iint_cache *iint,
 	rc = vfs_getxattr_alloc(dentry, XATTR_NAME_IMA, (char **)&xattr_value,
 				0, GFP_NOFS);
 	if (rc <= 0) {
+		/* File system does not support security xattr */
+		if (rc == -EOPNOTSUPP)
+			return INTEGRITY_UNKNOWN;
+
 		if (rc && rc != -ENODATA)
 			goto out;
 
-- 
1.7.7.6

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