From 0f5e7b41f91814447defc34e915fc5d6e52266d9 Mon Sep 17 00:00:00 2001
From: Sanidhya Kashyap <sanidhya.gatech@gmail.com>
Date: Fri, 4 Sep 2015 15:44:08 -0700
Subject: [PATCH] ocfs2: trusted xattr missing CAP_SYS_ADMIN check
The trusted extended attributes are only visible to the process which
hvae CAP_SYS_ADMIN capability but the check is missing in ocfs2
xattr_handler trusted list. The check is important because this will be
used for implementing mechanisms in the userspace for which other
ordinary processes should not have access to.
Signed-off-by: Sanidhya Kashyap <sanidhya.gatech@gmail.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Taesoo kim <taesoo@gatech.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
fs/ocfs2/xattr.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index 889f3796a0d73..a24f264b2fc44 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -7334,6 +7334,9 @@ static size_t ocfs2_xattr_trusted_list(struct dentry *dentry, char *list,
const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
const size_t total_len = prefix_len + name_len + 1;
+ if (!capable(CAP_SYS_ADMIN))
+ return 0;
+
if (list && total_len <= list_size) {
memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
memcpy(list + prefix_len, name, name_len);
--
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