On Mon, Jun 06, 2016 at 03:45:11PM +0300, Vasily Averin wrote: > In mainline rootfs is marked always as MNT_LOCKED, > sys_umount checks this flag and fails its processing. > Our kernels lacks for MNT_LOCKED flag, so we use another kind of check > to prevent incorrect operation. > > https://jira.sw.ru/browse/PSBM-46437 > > Signed-off-by: Vasily Averin <v...@virtuozzo.com>
> diff --git a/fs/namespace.c b/fs/namespace.c > index 988320b..6f05245 100644 > --- a/fs/namespace.c > +++ b/fs/namespace.c > @@ -1355,6 +1355,8 @@ SYSCALL_DEFINE2(umount, char __user *, name, int, flags) > goto dput_and_out; > if (!check_mnt(mnt)) > goto dput_and_out; > + if (path.mnt->mnt_parent == path.mnt) We can user mnt_has_parent() here > + goto dput_and_out; > > retval = do_umount(mnt, flags); > dput_and_out: _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel
