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From: Jens Axboe <axboe@kernel.dk>
To: Pavel Begunkov <asml.silence@gmail.com>,
io-uring@vger.kernel.org,
Alexander Viro <viro@zeniv.linux.org.uk>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>
Cc: Palash Oswal <oswalpalash@gmail.com>,
Sudip Mukherjee <sudipm.mukherjee@gmail.com>,
linux-kernel@vger.kernel.org,
syzbot+9671693590ef5aad8953@syzkaller.appspotmail.com
Subject: Re: [PATCH v3 0/2] iter revert problems
Date: Mon, 23 Aug 2021 10:14:42 -0600 [thread overview]
Message-ID: <2a981061-5420-85dd-d41c-7ed36384465c@kernel.dk> (raw)
In-Reply-To: <cover.1629713020.git.asml.silence@gmail.com>
On 8/23/21 4:18 AM, Pavel Begunkov wrote:
> iov_iter_revert() doesn't go well with iov_iter_truncate() in all
> cases, see 2/2 for the bug description. As mentioned there the current
> problems is because of generic_write_checks(), but there was also a
> similar case fixed in 5.12, which should have been triggerable by normal
> write(2)/read(2) and others.
>
> It may be better to enforce reexpands as a long term solution, but for
> now this patchset is quickier and easier to backport.
Al, given the discussion from this weekend, are you fine with the first
patch? If so, would be great with an ack/review. Or, if you want to
funnel this for 5.14, you can add:
Reviewed-by: Jens Axboe <axboe@kernel.dk>
--
Jens Axboe
next prev parent reply other threads:[~2021-08-23 16:14 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-23 10:18 Pavel Begunkov
2021-08-23 10:18 ` [PATCH v3 1/2] iov_iter: track truncated size Pavel Begunkov
2021-08-23 10:18 ` [PATCH v3 2/2] io_uring: reexpand under-reexpanded iters Pavel Begunkov
2021-08-23 16:14 ` Jens Axboe [this message]
2021-09-03 20:55 ` [PATCH v3 0/2] iter revert problems Jens Axboe
2021-09-03 21:55 ` Al Viro
2021-09-04 0:57 ` Jens Axboe
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