linux-kernel - Re: [PATCH] io_uring: fix mm use with IORING_OP

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <df11c48e-f456-3b64-88d1-6012b1ac2bc8@kernel.dk>
Date:   Wed, 5 Feb 2020 08:54:20 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Pavel Begunkov <asml.silence@...il.com>, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] io_uring: fix mm use with IORING_OP_{READ,WRITE}

On 2/5/20 8:46 AM, Pavel Begunkov wrote:
> IORING_OP_{READ,WRITE} need mm to access user buffers, hence
> req->has_user check should go for them as well. Move the corresponding
> imports past the check.

I'd need to double check, but I think the has_user check should just go.
The import checks for access anyway, so we'll -EFAULT there if we
somehow messed up and didn't acquire the right mm.

-- 
Jens Axboe