On Thu, Jun 09, 2016 at 10:30:48AM +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. > > v2: use mnt_has_parent() > > https://jira.sw.ru/browse/PSBM-46437 >
Acked-by: Andrey Vagin <[email protected]> > Signed-off-by: Vasily Averin <[email protected]> > diff --git a/fs/namespace.c b/fs/namespace.c > index 988320b..4fb935a 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 (!mnt_has_parent(mnt)) > + goto dput_and_out; > > retval = do_umount(mnt, flags); > dput_and_out: _______________________________________________ Devel mailing list [email protected] https://lists.openvz.org/mailman/listinfo/devel
