From 27d55f1f4c190b14092fcca3069c7d15df83514f Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 16 Jan 2010 13:07:36 -0500
Subject: do_add_mount() should sanitize mnt_flags
MNT_WRITE_HOLD shouldn't leak into new vfsmount and neither
should MNT_SHARED (the latter will be set properly, along with
the rest of shared-subtree data structures)
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/namespace.c | 2 ++
1 file changed, 2 insertions(+)
(limited to 'fs')
diff --git a/fs/namespace.c b/fs/namespace.c
index 779293e29b85..c768f733c8d6 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1671,6 +1671,8 @@ int do_add_mount(struct vfsmount *newmnt, struct path *path,
{
int err;
+ mnt_flags &= ~(MNT_SHARED | MNT_WRITE_HOLD);
+
down_write(&namespace_sem);
/* Something was mounted here while we slept */
while (d_mountpoint(path->dentry) &&
--
cgit