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From: Miklos Szeredi <miklos@szeredi.hu>
To: Greg Kurz <groug@kaod.org>
Cc: virtualization@lists.linux-foundation.org,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	virtio-fs@redhat.com, Stefan Hajnoczi <stefanha@redhat.com>,
	Max Reitz <mreitz@redhat.com>, Vivek Goyal <vgoyal@redhat.com>
Subject: Re: [PATCH v4 2/5] fuse: Call vfs_get_tree() for submounts
Date: Fri, 21 May 2021 10:19:48 +0200	[thread overview]
Message-ID: <YKdtJCo/06q594pM@miu.piliscsaba.redhat.com> (raw)
In-Reply-To: <20210520154654.1791183-3-groug@kaod.org>

On Thu, May 20, 2021 at 05:46:51PM +0200, Greg Kurz wrote:
> We don't set the SB_BORN flag on submounts superblocks. This is wrong
> as these superblocks are then considered as partially constructed or
> dying in the rest of the code and can break some assumptions.
> 
> One such case is when you have a virtiofs filesystem and you try to
> mount it again : virtio_fs_get_tree() tries to obtain a superblock
> with sget_fc(). The matching criteria in virtio_fs_test_super() is
> the pointer of the underlying virtiofs device, which is shared by
> the root mount and its submounts. This means that any submount can
> be picked up instead of the root mount. This is itself a bug :
> submounts should be ignored in this case. But, most importantly, it
> then triggers an infinite loop in sget_fc() because it fails to grab
> the superblock (very easy to reproduce).
> 
> The only viable solution is to set SB_BORN at some point. This
> must be done with vfs_get_tree() because setting SB_BORN requires
> special care, i.e. a memory barrier for super_cache_count() which
> can check SB_BORN without taking any lock.

Looks correct, but...

as an easily backportable and verifiable bugfix I'd still go with the
simple two liner:

--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -351,6 +351,9 @@ static struct vfsmount *fuse_dentry_automount(struct path *path)
 	list_add_tail(&fm->fc_entry, &fc->mounts);
 	up_write(&fc->killsb);
 
+	smp_wmb();
+	sb->s_flags |= SB_BORN;
+
 	/* Create the submount */
 	mnt = vfs_create_mount(fsc);
 	if (IS_ERR(mnt)) {

And have this patch be the cleanup.

Also we need Fixes: and a Cc: stable@... tags on that one.

Thanks,
Miklos

  reply	other threads:[~2021-05-21  8:19 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-20 15:46 [PATCH v4 0/5] virtiofs: propagate sync() to file server Greg Kurz
2021-05-20 15:46 ` [PATCH v4 1/5] fuse: Fix leak in fuse_dentry_automount() error path Greg Kurz
2021-05-20 19:45   ` Al Viro
2021-05-21  7:54     ` Miklos Szeredi
2021-05-21  8:15       ` Greg Kurz
2021-05-21  8:23         ` Miklos Szeredi
2021-05-21  8:08     ` Greg Kurz
2021-05-20 15:46 ` [PATCH v4 2/5] fuse: Call vfs_get_tree() for submounts Greg Kurz
2021-05-21  8:19   ` Miklos Szeredi [this message]
2021-05-21  8:28     ` Greg Kurz
2021-05-22 17:50   ` kernel test robot
2021-05-22 20:12   ` kernel test robot
2021-05-20 15:46 ` [PATCH v4 3/5] fuse: Make fuse_fill_super_submount() static Greg Kurz
2021-05-20 15:46 ` [PATCH v4 4/5] virtiofs: Skip submounts in sget_fc() Greg Kurz
2021-05-21  8:26   ` Miklos Szeredi
2021-05-21  8:39     ` Greg Kurz
2021-05-21  8:50       ` Miklos Szeredi
2021-05-21 10:06         ` Greg Kurz
2021-05-21 12:37           ` Miklos Szeredi
2021-05-21 13:36             ` Greg Kurz
2021-05-20 15:46 ` [PATCH v4 5/5] virtiofs: propagate sync() to file server Greg Kurz
2021-05-21 10:08   ` Greg Kurz
2021-05-21 12:51     ` Miklos Szeredi
2021-08-15 14:14   ` Amir Goldstein
2021-08-16 15:29     ` Vivek Goyal
2021-08-16 18:57       ` Amir Goldstein
2021-08-16 19:11         ` Vivek Goyal
2021-08-16 19:46           ` Amir Goldstein
2021-08-28 15:21       ` Miklos Szeredi
2021-08-30 17:01         ` Vivek Goyal
2021-08-30 17:36           ` Miklos Szeredi

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