From: Christoph Hellwig <hch@lst.de>
To: Askar Safin <safinaskar@gmail.com>
Cc: dhowells@redhat.com, axboe@kernel.dk, brauner@kernel.org,
cem@kernel.org, djwong@kernel.org, hch@lst.de,
kundan.kumar@samsung.com, linux-block@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org,
viro@zeniv.linux.org.uk, willy@infradead.org, wqu@suse.com
Subject: Re: [PATCH 03/14] iov_iter: extract a iov_iter_extract_bvecs helper from bio code
Date: Tue, 3 Feb 2026 17:32:36 +0100 [thread overview]
Message-ID: <20260203163236.GA28989@lst.de> (raw)
In-Reply-To: <20260203102821.3017412-1-safinaskar@gmail.com>
On Tue, Feb 03, 2026 at 01:28:21PM +0300, Askar Safin wrote:
> David Howells <dhowells@redhat.com>:
> > Can we make vmsplice() just copy data?
>
> vmsplice already caused at least one security issue in the past:
> CVE-2020-29374 (see https://lwn.net/Articles/849638/ ). There may be other
> CVEs, try to search CVE database.
>
> Also, I think vmsplice is rarely used.
>
> So, if you author a patch, which makes vmsplice equivalent to readv/writev,
> and mention these CVEs, then, I think, such patch has high chance to
> succeed.
I'd be all for killing it, especially as getting it to properly pin
the user buffers is still unsolved so far.
next prev parent reply other threads:[~2026-02-03 16:32 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20260123121444epcas5p4e729259011e031a28be8379ea3b9b749@epcas5p4.samsung.com>
2026-01-19 7:44 ` bounce buffer direct I/O when stable pages are required v2 Christoph Hellwig
2026-01-19 7:44 ` [PATCH 01/14] block: refactor get_contig_folio_len Christoph Hellwig
2026-01-22 11:00 ` Johannes Thumshirn
2026-01-22 17:54 ` Darrick J. Wong
2026-01-23 8:32 ` Damien Le Moal
2026-01-23 8:35 ` Christoph Hellwig
2026-01-23 8:44 ` Damien Le Moal
2026-01-23 8:45 ` Damien Le Moal
2026-01-23 12:14 ` Anuj Gupta
2026-01-19 7:44 ` [PATCH 02/14] block: open code bio_add_page and fix handling of mismatching P2P ranges Christoph Hellwig
2026-01-22 11:04 ` Johannes Thumshirn
2026-01-22 17:59 ` Darrick J. Wong
2026-01-23 5:43 ` Christoph Hellwig
2026-01-23 7:05 ` Darrick J. Wong
2026-01-23 8:35 ` Damien Le Moal
2026-01-23 12:15 ` Anuj Gupta
2026-01-19 7:44 ` [PATCH 03/14] iov_iter: extract a iov_iter_extract_bvecs helper from bio code Christoph Hellwig
2026-01-22 17:47 ` Darrick J. Wong
2026-01-23 5:44 ` Christoph Hellwig
2026-01-23 7:09 ` Darrick J. Wong
2026-01-23 7:14 ` Christoph Hellwig
2026-01-23 11:37 ` David Howells
2026-01-23 13:58 ` Christoph Hellwig
2026-01-23 14:57 ` David Howells
2026-01-26 17:36 ` Matthew Wilcox
2026-01-27 5:13 ` Christoph Hellwig
2026-01-27 5:44 ` Matthew Wilcox
2026-01-27 5:47 ` Christoph Hellwig
2026-02-03 8:20 ` Askar Safin
2026-02-03 10:28 ` Askar Safin
2026-02-03 16:32 ` Christoph Hellwig [this message]
2026-01-19 7:44 ` [PATCH 04/14] block: remove bio_release_page Christoph Hellwig
2026-01-22 11:14 ` Johannes Thumshirn
2026-01-22 17:26 ` Darrick J. Wong
2026-01-23 8:43 ` Damien Le Moal
2026-01-23 12:17 ` Anuj Gupta
2026-01-19 7:44 ` [PATCH 05/14] block: add helpers to bounce buffer an iov_iter into bios Christoph Hellwig
2026-01-22 13:05 ` Johannes Thumshirn
2026-01-22 17:25 ` Darrick J. Wong
2026-01-23 5:51 ` Christoph Hellwig
2026-01-23 7:11 ` Darrick J. Wong
2026-01-23 7:16 ` Christoph Hellwig
2026-01-23 8:52 ` Damien Le Moal
2026-01-23 12:20 ` Anuj Gupta
2026-01-19 7:44 ` [PATCH 06/14] iomap: fix submission side handling of completion side errors Christoph Hellwig
2026-01-19 17:40 ` Darrick J. Wong
2026-01-23 8:54 ` Damien Le Moal
2026-01-19 7:44 ` [PATCH 07/14] iomap: simplify iomap_dio_bio_iter Christoph Hellwig
2026-01-19 17:43 ` Darrick J. Wong
2026-01-23 8:55 ` Damien Le Moal
2026-01-19 7:44 ` [PATCH 08/14] iomap: split out the per-bio logic from iomap_dio_bio_iter Christoph Hellwig
2026-01-23 8:57 ` Damien Le Moal
2026-01-19 7:44 ` [PATCH 09/14] iomap: share code between iomap_dio_bio_end_io and iomap_finish_ioend_direct Christoph Hellwig
2026-01-23 8:58 ` Damien Le Moal
2026-01-19 7:44 ` [PATCH 10/14] iomap: free the bio before completing the dio Christoph Hellwig
2026-01-19 17:43 ` Darrick J. Wong
2026-01-23 8:59 ` Damien Le Moal
2026-01-19 7:44 ` [PATCH 11/14] iomap: rename IOMAP_DIO_DIRTY to IOMAP_DIO_USER_BACKED Christoph Hellwig
2026-01-23 9:00 ` Damien Le Moal
2026-01-19 7:44 ` [PATCH 12/14] iomap: support ioends for direct reads Christoph Hellwig
2026-01-23 9:02 ` Damien Le Moal
2026-01-19 7:44 ` [PATCH 13/14] iomap: add a flag to bounce buffer direct I/O Christoph Hellwig
2026-01-23 9:05 ` Damien Le Moal
2026-01-19 7:44 ` [PATCH 14/14] xfs: use bounce buffering direct I/O when the device requires stable pages Christoph Hellwig
2026-01-19 17:45 ` Darrick J. Wong
2026-01-23 9:08 ` Damien Le Moal
2026-01-23 12:10 ` bounce buffer direct I/O when stable pages are required v2 Anuj Gupta
2026-01-23 14:01 ` Christoph Hellwig
2026-01-23 14:09 ` Keith Busch
2026-01-23 12:24 ` Christian Brauner
2026-01-23 14:10 ` block or iomap tree, was: " Christoph Hellwig
2026-01-27 10:31 ` Christian Brauner
2026-01-27 12:50 ` Christoph Hellwig
2026-01-14 7:40 bounce buffer direct I/O when stable pages are required Christoph Hellwig
2026-01-14 7:41 ` [PATCH 03/14] iov_iter: extract a iov_iter_extract_bvecs helper from bio code Christoph Hellwig
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