From: Brian Foster <bfoster@redhat.com>
To: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: sandeen@sandeen.net, linux-xfs@vger.kernel.org
Subject: Re: [PATCH 1/2] libxfs: zero the struct xfs_mount when unmounting the filesystem
Date: Tue, 25 Feb 2020 10:13:19 -0500 [thread overview]
Message-ID: <20200225151319.GD26938@bfoster> (raw)
In-Reply-To: <158258948007.451256.11063346596276638956.stgit@magnolia>
On Mon, Feb 24, 2020 at 04:11:20PM -0800, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@oracle.com>
>
> Since libxfs doesn't allocate the struct xfs_mount *, we can't just free
> it during unmount. Zero its contents to prevent any use-after-free.
>
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> ---
Reviewed-by: Brian Foster <bfoster@redhat.com>
> libxfs/init.c | 1 +
> 1 file changed, 1 insertion(+)
>
>
> diff --git a/libxfs/init.c b/libxfs/init.c
> index d4804ead..197690df 100644
> --- a/libxfs/init.c
> +++ b/libxfs/init.c
> @@ -904,6 +904,7 @@ libxfs_umount(
> if (mp->m_logdev_targp != mp->m_ddev_targp)
> kmem_free(mp->m_logdev_targp);
> kmem_free(mp->m_ddev_targp);
> + memset(mp, 0, sizeof(struct xfs_mount));
>
> return error;
> }
>
next prev parent reply other threads:[~2020-02-25 15:13 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-25 0:11 [PATCH 0/2] libxfs: minor cleanups of destructors Darrick J. Wong
2020-02-25 0:11 ` [PATCH 1/2] libxfs: zero the struct xfs_mount when unmounting the filesystem Darrick J. Wong
2020-02-25 5:57 ` Eric Sandeen
2020-02-25 15:08 ` Darrick J. Wong
2020-02-25 15:13 ` Brian Foster [this message]
2020-02-25 17:40 ` Christoph Hellwig
2020-02-25 18:28 ` Darrick J. Wong
2020-02-25 18:48 ` Eric Sandeen
2020-02-25 0:11 ` [PATCH 2/2] libxfs: clean up libxfs_destroy Darrick J. Wong
2020-02-25 6:00 ` Eric Sandeen
2020-02-25 15:13 ` Brian Foster
2020-02-25 17:41 ` Christoph Hellwig
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