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From: Eric Biggers <ebiggers@kernel.org>
To: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org,
	David Howells <dhowells@redhat.com>,
	linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [PATCH] vfs: move_mount: reject moving kernel internal mounts
Date: Mon, 1 Jul 2019 08:43:17 -0700	[thread overview]
Message-ID: <20190701154317.GB790@sol.localdomain> (raw)
In-Reply-To: <20190701010847.GA23778@ZenIV.linux.org.uk>

On Mon, Jul 01, 2019 at 02:08:48AM +0100, Al Viro wrote:
> 
> Let's reorder that a bit:
>         /* The mountpoint must be in our namespace. */
>         if (!check_mnt(p))
>                 goto out;
> 
> 	/* The thing moved must be mounted... */
> 	if (!is_mounted(old_path->mnt))
> 		goto out;
> 
>         /* ... and either ours or the root of anon namespace */
> 	if (!(attached ? check_mnt(old) : is_anon_ns(ns)))
> 		goto out;
> 
> IMO that looks saner and all it costs us is a redundant check
> in attached case.  Objections?

Looks good to me.

- Eric

  reply	other threads:[~2019-07-01 15:43 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-18 10:47 general protection fault in do_move_mount (2) syzbot
2019-06-18 14:02 ` Al Viro
2019-06-24  9:28   ` Dmitry Vyukov
2019-06-29 20:27     ` [PATCH] vfs: move_mount: reject moving kernel internal mounts Eric Biggers
2019-06-29 20:39       ` Al Viro
2019-07-01  1:08         ` Al Viro
2019-07-01 15:43           ` Eric Biggers [this message]
2019-07-01  7:38         ` David Howells
2019-07-01 11:19           ` Al Viro
2019-07-01 16:45       ` Eric Biggers
2019-07-01 18:22         ` Al Viro
2019-07-01 19:20           ` Al Viro
2019-07-02 18:22           ` Eric Biggers
2019-07-09 19:40             ` Eric Biggers
2019-07-09 20:54               ` Al Viro
2019-07-10  3:23                 ` 6 new syscalls without tests (was: [PATCH] vfs: move_mount: reject moving kernel internal mounts) Eric Biggers
2019-07-05  9:01           ` move_mount.2 David Howells
2019-06-29 20:39     ` general protection fault in do_move_mount (2) Eric Biggers
2019-07-01 14:59       ` Dmitry Vyukov
2019-07-01 15:18         ` Eric Biggers
2019-07-05 12:17           ` Dmitry Vyukov
2019-07-05 13:02           ` Dmitry Vyukov

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