linux-kernel - Re: [PATCH 2/2] crypto: virtio: Fix use-after-free in virtio_crypto_skcipher_finalize

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Date:   Mon, 25 May 2020 15:13:24 +0800
From:   "Longpeng (Mike, Cloud Infrastructure Service Product Dept.)" 
        <longpeng2@...wei.com>
To:     Markus Elfring <Markus.Elfring@....de>,
        <linux-crypto@...r.kernel.org>,
        <virtualization@...ts.linux-foundation.org>
CC:     Arei Gonglei <arei.gonglei@...wei.com>,
        Corentin Labbe <clabbe@...libre.com>,
        "David S. Miller" <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] crypto: virtio: Fix use-after-free in
 virtio_crypto_skcipher_finalize_req()

Hi Markus,

On 2020/5/25 14:30, Markus Elfring wrote:
>> … So the system will crash
>> at last when this memory be used again.
> 
> I would prefer a wording with less typos here.
> 
Could you help me to make the sentence better?

> 
>> We can free the resources before calling ->complete to fix this issue.
> 
> * An imperative wording can be nicer.
>   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=9cb1fd0efd195590b828b9b865421ad345a4a145#n151
> 
I'll try.

> * You proposed to move a call of the function “crypto_finalize_skcipher_request”.
>   How does this change fit to the mentioned position?
> 
The resources which need to be freed is not used anymore, but the pointers
of these resources may be changed in the function
"crypto_finalize_skcipher_request", so free these resources before call the
function is suitable.

> * Would you like to add the tag “Fixes” to the commit message?
>
OK.

> Regards,
> Markus
> 

-- 
---
Regards,
Longpeng(Mike)