commit ee6f958291e2a768fd727e7a67badfff0b67711a
author Miklos Szeredi <mszeredi@suse.cz> Tue May 08 00:30:40 2007 -0700
committer Linus Torvalds <torvalds@woody.linux-foundation.org> Tue May 08 11:15:12 2007 -0700
tree 1313cb3a5d50a296b1801022f904f3a5e9601de2
parent 2f1a2ccb9c0de632ab07193becf5f7121794f6ae

check privileges before setting mount propagation

There's a missing check for CAP_SYS_ADMIN in do_change_type().

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/namespace.c

diff --git a/fs/namespace.c b/fs/namespace.c
index 72bb106..b696e3a 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -886,6 +886,9 @@
 	int recurse = flag & MS_REC;
 	int type = flag & ~MS_REC;
 
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
 	if (nd->dentry != nd->mnt->mnt_root)
 		return -EINVAL;