linux-kernel - Re: [PATCH] fs/io_uring.c: Fix uninitialized variable is referenced in io_submit

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Message-ID: <9fd08f8f-8c89-9c59-6d9e-5933ccc65967@kernel.dk>
Date:   Thu, 13 Aug 2020 08:56:30 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Liu Yong <pkfxxxing@...il.com>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] fs/io_uring.c: Fix uninitialized variable is referenced
 in io_submit_sqe

On 8/13/20 12:56 AM, Liu Yong wrote:
> the commit <a4d61e66ee4a> ("<io_uring: prevent re-read of sqe->opcode>") 
> caused another vulnerability. After io_get_req(), the sqe_submit struct 
> in req is not initialized, but the following code defaults that 
> req->submit.opcode is available.

Thanks, I'll add this for 5.4-stable, it doesn't affect any kernels newer
than that.

-- 
Jens Axboe