Commit 27d55f1f authored by Al Viro's avatar Al Viro
Browse files

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: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 7e1295d9

fs/namespace.c

+2 −0
Original line number Diff line number Diff line
@@ -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) &&