linux-kernel - Re: [PATCH v2 0/2] iter revert problems

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Date:   Sat, 21 Aug 2021 15:24:28 +0100
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Jens Axboe <axboe@...nel.dk>, io-uring@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Cc:     Palash Oswal <oswalpalash@...il.com>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        linux-kernel@...r.kernel.org,
        syzbot+9671693590ef5aad8953@...kaller.appspotmail.com
Subject: Re: [PATCH v2 0/2] iter revert problems

On 8/12/21 9:40 PM, Pavel Begunkov wrote:
> For the bug description see 2/2. 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.

We need to do something with this, hopefully soon.


> v2: don't fail it has been justly fully reverted
> 
> Pavel Begunkov (2):
>   iov_iter: mark truncated iters
>   io_uring: don't retry with truncated iter
> 
>  fs/io_uring.c       | 16 ++++++++++++++++
>  include/linux/uio.h |  5 ++++-
>  2 files changed, 20 insertions(+), 1 deletion(-)
> 

-- 
Pavel Begunkov