[PATCH v3 3/7] jffs2: Add missing capability check for listing trusted xattrs

From: Andreas Gruenbacher <agruenba@redhat.com>
To: Alexander Viro <viro@zeniv.linux.org.uk>,
	Christoph Hellwig <hch@infradead.org>,
	linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Cc: David Woodhouse <dwmw2@infradead.org>, linux-mtd@lists.infradead.org
Subject: [PATCH v3 3/7] jffs2: Add missing capability check for listing trusted xattrs
Date: Sun,  4 Oct 2015 19:18:50 +0200	[thread overview]
Message-ID: <1443979134-7279-4-git-send-email-agruenba@redhat.com> (raw)
In-Reply-To: <1443979134-7279-1-git-send-email-agruenba@redhat.com>

The vfs checks if a task has the appropriate access for get and set
operations, but it cannot do that for the list operation; the file system
must check for that itself.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: linux-mtd@lists.infradead.org
---
 fs/jffs2/xattr_trusted.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/jffs2/xattr_trusted.c b/fs/jffs2/xattr_trusted.c
index ceaf9c6..bbd20c1 100644
--- a/fs/jffs2/xattr_trusted.c
+++ b/fs/jffs2/xattr_trusted.c
@@ -39,6 +39,9 @@ static size_t jffs2_trusted_listxattr(struct dentry *dentry, char *list,
 {
 	size_t retlen = XATTR_TRUSTED_PREFIX_LEN + name_len + 1;
 
+	if (!capable(CAP_SYS_ADMIN))
+		return 0;
+
 	if (list && retlen<=list_size) {
 		strcpy(list, XATTR_TRUSTED_PREFIX);
 		strcpy(list + XATTR_TRUSTED_PREFIX_LEN, name);
-- 
2.5.0

