[PATCH 1/6] ima: detect security xattrs not enabled

[Vivek Goyal <vgoyal@redhat.com>]

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@redhat.com>
Acked-by: Mimi Zohar <zohar@linux.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