From: Greg KH <greg@kroah.com>
To: Pavel Begunkov <asml.silence@gmail.com>
Cc: stable@vger.kernel.org, Jens Axboe <axboe@kernel.dk>
Subject: Re: [PATCH stable-5.10 1/1] io_uring: disable polling pollfree files
Date: Fri, 2 Sep 2022 08:13:43 +0200 [thread overview]
Message-ID: <YxGfF7hQOGa6lKMt@kroah.com> (raw)
In-Reply-To: <756d8d67-7a63-62a1-51e4-1e966f40610d@gmail.com>
On Thu, Sep 01, 2022 at 04:25:46PM +0100, Pavel Begunkov wrote:
> On 9/1/22 16:16, Pavel Begunkov wrote:
> > Older kernels lack io_uring POLLFREE handling. As only affected files
> > are signalfd and android binder the safest option would be to disable
> > polling those files via io_uring and hope there are no users.
>
> It differs from how it's fixed upstream, but IMHO porting is too
> difficult to be reliable enough, this one is quick and simple.
> The upstream fix:
>
> commit 791f3465c4afde02d7f16cf7424ca87070b69396
> Author: Pavel Begunkov <asml.silence@gmail.com>
> Date: Fri Jan 14 11:59:10 2022 +0000
>
> io_uring: fix UAF due to missing POLLFREE handling
>
>
> I also forgot Fixes tag if required:
>
> Fixes: 221c5eb233823 ("io_uring: add support for IORING_OP_POLL")
I'll go add it by hand, all now queued up, thanks!
greg k-h
next prev parent reply other threads:[~2022-09-02 6:13 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-01 15:16 [PATCH stable-5.10 1/1] io_uring: disable polling pollfree files Pavel Begunkov
2022-09-01 15:25 ` Pavel Begunkov
2022-09-02 6:13 ` Greg KH [this message]
2022-09-02 10:38 ` Pavel Begunkov
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