From: Al Viro <[email protected]>
To: Jens Axboe <[email protected]>
Cc: Pavel Begunkov <[email protected]>,
[email protected],
linux-fsdevel <[email protected]>,
Palash Oswal <[email protected]>,
Sudip Mukherjee <[email protected]>,
[email protected],
[email protected]
Subject: Re: [PATCH v3 0/2] iter revert problems
Date: Fri, 3 Sep 2021 21:55:14 +0000 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On Fri, Sep 03, 2021 at 02:55:26PM -0600, Jens Axboe wrote:
> 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.
> >
> > v2: don't fail if it was justly fully reverted
> > v3: use truncated size + reexapand based approach
>
> Al, let's get this upstream. How do you want to handle it? I can take
> it through the io_uring tree, or it can go through your tree. I really
> don't care which route it takes, but we should get this upstream as
> it solves a real problem.
Grabbed, will test and send a pull request...
next prev parent reply other threads:[~2021-09-03 21:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-23 10:18 [PATCH v3 0/2] iter revert problems 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 ` [PATCH v3 0/2] iter revert problems Jens Axboe
2021-09-03 20:55 ` Jens Axboe
2021-09-03 21:55 ` Al Viro [this message]
2021-09-04 0:57 ` Jens Axboe
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