From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 16 Jan 2010 18:07:36 +0000 (-0500)
Subject: do_add_mount() should sanitize mnt_flags
X-Git-Tag: v2.6.33-rc5~25^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=27d55f1f4c190b14092fcca3069c7d15df83514f;p=profile%2Fivi%2Fkernel-x86-ivi.git

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>
---

diff --git a/fs/namespace.c b/fs/namespace.c
index 779293e..c768f73 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) &&