From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: Dave Chinner <david@fromorbit.com>
Cc: sandeen@redhat.com, linux-nfs@vger.kernel.org,
linux-cifs@vger.kernel.org, linux-unionfs@vger.kernel.org,
linux-xfs@vger.kernel.org, linux-mm@kvack.org,
linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
ocfs2-devel@oss.oracle.com
Subject: Re: [PATCH v2 00/25] fs: fixes for serious clone/dedupe problems
Date: Tue, 9 Oct 2018 18:06:52 -0700 [thread overview]
Message-ID: <20181010010652.GK28243@magnolia> (raw)
In-Reply-To: <20181010010208.GI6311@dastard>
On Wed, Oct 10, 2018 at 12:02:08PM +1100, Dave Chinner wrote:
> On Tue, Oct 09, 2018 at 05:10:38PM -0700, Darrick J. Wong wrote:
> > Hi all,
> >
> > Dave, Eric, and I have been chasing a stale data exposure bug in the XFS
> > reflink implementation, and tracked it down to reflink forgetting to do
> > some of the file-extending activities that must happen for regular
> > writes.
> >
> > We then started auditing the clone, dedupe, and copyfile code and
> > realized that from a file contents perspective, clonerange isn't any
> > different from a regular file write. Unfortunately, we also noticed
> > that *unlike* a regular write, clonerange skips a ton of overflow
> > checks, such as validating the ranges against s_maxbytes, MAX_NON_LFS,
> > and RLIMIT_FSIZE. We also observed that cloning into a file did not
> > strip security privileges (suid, capabilities) like a regular write
> > would. I also noticed that xfs and ocfs2 need to dump the page cache
> > before remapping blocks, not after.
> >
> > In fixing the range checking problems I also realized that both dedupe
> > and copyfile tell userspace how much of the requested operation was
> > acted upon. Since the range validation can shorten a clone request (or
> > we can ENOSPC midway through), we might as well plumb the short
> > operation reporting back through the VFS indirection code to userspace.
> >
> > So, here's the whole giant pile of patches[1] that fix all the problems.
> > The patch "generic: test reflink side effects" recently sent to fstests
> > exercises the fixes in this series. Tests are in [2].
>
> Can you rebase this on the for-next branch on the xfs tree which
> already contains some of the initial fixes in the series and a
> couple of other reflink/dedupe data corruption fixes? I'm planning
> on pushing them to Greg tomorrow, so you'll have to do this soon
> anyway....
<nod> I was planning to do that tomorrow, but figured I might as well
scrape for review comments in the mean time.
--D
> Cheers,
>
> Dave.
> --
> Dave Chinner
> david@fromorbit.com
prev parent reply other threads:[~2018-10-10 1:06 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-10 0:10 [PATCH v2 00/25] fs: fixes for serious clone/dedupe problems Darrick J. Wong
2018-10-10 0:10 ` [PATCH 01/25] xfs: add a per-xfs trace_printk macro Darrick J. Wong
2018-10-10 0:36 ` Dave Chinner
2018-10-10 15:00 ` [PATCH v2 " Darrick J. Wong
2018-10-10 0:10 ` [PATCH 02/25] xfs: refactor clonerange preparation into a separate helper Darrick J. Wong
2018-10-10 0:10 ` [PATCH 03/25] xfs: zero posteof blocks when cloning above eof Darrick J. Wong
2018-10-10 0:11 ` [PATCH 04/25] xfs: update ctime and remove suid before cloning files Darrick J. Wong
2018-10-10 0:11 ` [PATCH 05/25] vfs: check file ranges " Darrick J. Wong
2018-10-10 23:06 ` Dave Chinner
2018-10-10 23:13 ` Darrick J. Wong
2018-10-10 0:11 ` [PATCH 06/25] vfs: strengthen checking of file range inputs to generic_remap_checks Darrick J. Wong
2018-10-10 5:23 ` Amir Goldstein
2018-10-10 17:01 ` Darrick J. Wong
2018-10-10 17:26 ` Amir Goldstein
2018-10-10 0:11 ` [PATCH 07/25] vfs: skip zero-length dedupe requests Darrick J. Wong
2018-10-10 0:11 ` [PATCH 08/25] vfs: combine the clone and dedupe into a single remap_file_range Darrick J. Wong
2018-10-10 5:54 ` Amir Goldstein
2018-10-10 15:13 ` Darrick J. Wong
2018-10-10 15:23 ` Amir Goldstein
2018-10-10 0:11 ` [PATCH 09/25] vfs: rename vfs_clone_file_prep to be more descriptive Darrick J. Wong
2018-10-10 0:11 ` [PATCH 10/25] vfs: rename clone_verify_area to remap_verify_area Darrick J. Wong
2018-10-10 0:13 ` [PATCH 11/25] vfs: create generic_remap_file_range_touch to update inode metadata Darrick J. Wong
2018-10-10 0:13 ` [PATCH 12/25] vfs: pass remap flags to generic_remap_file_range_prep Darrick J. Wong
2018-10-10 0:13 ` [PATCH 13/25] vfs: pass remap flags to generic_remap_checks Darrick J. Wong
2018-10-10 0:13 ` [PATCH 14/25] vfs: make remap_file_range functions take and return bytes completed Darrick J. Wong
2018-10-10 6:47 ` Amir Goldstein
2018-10-10 15:50 ` Darrick J. Wong
2018-10-10 18:28 ` Amir Goldstein
2018-10-10 18:32 ` Darrick J. Wong
2018-10-10 0:13 ` [PATCH 15/25] vfs: plumb RFR_* remap flags through the vfs clone functions Darrick J. Wong
2018-10-10 6:22 ` Amir Goldstein
2018-10-10 6:39 ` Amir Goldstein
2018-10-10 0:13 ` [PATCH 16/25] vfs: plumb RFR_* remap flags through the vfs dedupe functions Darrick J. Wong
2018-10-10 0:13 ` [PATCH 17/25] vfs: make remapping to source file eof more explicit Darrick J. Wong
2018-10-10 12:29 ` Amir Goldstein
2018-10-10 16:29 ` Darrick J. Wong
2018-10-10 17:31 ` Amir Goldstein
2018-10-10 0:14 ` [PATCH 18/25] vfs: enable remap callers that can handle short operations Darrick J. Wong
2018-10-10 0:14 ` [PATCH 19/25] vfs: hide file range comparison function Darrick J. Wong
2018-10-10 0:14 ` [PATCH 20/25] vfs: implement opportunistic short dedupe Darrick J. Wong
2018-10-10 0:14 ` [PATCH 21/25] ocfs2: truncate page cache for clone destination file before remapping Darrick J. Wong
2018-10-10 0:14 ` [PATCH 22/25] ocfs2: fix pagecache truncation prior to reflink Darrick J. Wong
2018-10-10 0:14 ` [PATCH 23/25] ocfs2: support partial clone range and dedupe range Darrick J. Wong
2018-10-10 0:14 ` [PATCH 24/25] xfs: fix pagecache truncation prior to reflink Darrick J. Wong
2018-10-10 0:14 ` [PATCH 25/25] xfs: support returning partial reflink results Darrick J. Wong
2018-10-10 1:02 ` [PATCH v2 00/25] fs: fixes for serious clone/dedupe problems Dave Chinner
2018-10-10 1:06 ` Darrick J. Wong [this message]
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