linux-kernel - [PATCH 19/47] staging/lustre: fix permission problem of setfacl

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Date:	Sun, 27 Apr 2014 13:06:43 -0400
From:	Oleg Drokin <green@...uxhacker.ru>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Cc:	Li Xi <lixi@....com>, Oleg Drokin <oleg.drokin@...el.com>
Subject: [PATCH 19/47] staging/lustre: fix permission problem of setfacl

From: Li Xi <lixi@....com>

Setxattr does not check the permission when setting ACL xattrs. This
will cause security problem because any user can walk around
permission checking by changing ACL rules.

Signed-off-by: Li Xi <lixi@....com>
Reviewed-on: http://review.whamcloud.com/9473
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4704
Reviewed-by: Andreas Dilger <andreas.dilger@...el.com>
Reviewed-by: Bob Glossman <bob.glossman@...el.com>
Reviewed-by: John L. Hammond <john.hammond@...el.com>
Signed-off-by: Oleg Drokin <oleg.drokin@...el.com>
---
 drivers/staging/lustre/lustre/llite/xattr.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/staging/lustre/lustre/llite/xattr.c b/drivers/staging/lustre/lustre/llite/xattr.c
index b1ed4d9..67a1de4 100644
--- a/drivers/staging/lustre/lustre/llite/xattr.c
+++ b/drivers/staging/lustre/lustre/llite/xattr.c
@@ -124,6 +124,11 @@ int ll_setxattr_common(struct inode *inode, const char *name,
 	if (rc)
 		return rc;
 
+	if ((xattr_type == XATTR_ACL_ACCESS_T ||
+	     xattr_type == XATTR_ACL_DEFAULT_T) &&
+	    !inode_owner_or_capable(inode))
+		return -EPERM;
+
 	/* b10667: ignore lustre special xattr for now */
 	if ((xattr_type == XATTR_TRUSTED_T && strcmp(name, "trusted.lov") == 0) ||
 	    (xattr_type == XATTR_LUSTRE_T && strcmp(name, "lustre.lov") == 0))
-- 
1.8.5.3

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