From 27d55f1f4c190b14092fcca3069c7d15df83514f Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sat, 16 Jan 2010 13:07:36 -0500 Subject: [PATCH] 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 --- fs/namespace.c | 2 ++ 1 file changed, 2 insertions(+) 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) && -- 2.20.1