linux-kernel - Re: [PATCH v2] vduse: prevent uninitialized memory accesses

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Message-ID: <796c9d73-30a0-2401-e499-724aeb0f8dc6@redhat.com>
Date:   Wed, 31 Aug 2022 17:01:11 +0200
From:   Maxime Coquelin <maxime.coquelin@...hat.com>
To:     jasowang@...hat.com, Greg KH <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, elic@...dia.com,
        guanjun@...ux.alibaba.com, parav@...dia.com,
        gautam.dawar@...inx.com, dan.carpenter@...cle.com,
        xieyongji@...edance.com, mst@...hat.com, stable@...r.kernel.org
Subject: Re: [PATCH v2] vduse: prevent uninitialized memory accesses

On 8/29/22 09:48, Greg KH wrote:
> On Mon, Aug 29, 2022 at 09:34:24AM +0200, Maxime Coquelin wrote:
>> If the VDUSE application provides a smaller config space
>> than the driver expects, the driver may use uninitialized
>> memory from the stack.
>>
>> This patch prevents it by initializing the buffer passed by
>> the driver to store the config value.
>>
>> This fix addresses CVE-2022-2308.
>>
>> Cc: xieyongji@...edance.com
>> Cc: stable@...r.kernel.org # v5.15+
>> Fixes: c8a6153b6c59 ("vduse: Introduce VDUSE - vDPA Device in Userspace")
>>
>> Acked-by: Jason Wang <jasowang@...hat.com>
>> Signed-off-by: Maxime Coquelin <maxime.coquelin@...hat.com>
> 
> Please no blank line above the Acked-by: line here if possible.

Sure.

Jason, do you prefer I post a new revision with this single change or
you will handle it while applying? Either way is fine to me.

Thanks,
Maxime

> thanks,
> 
> greg k-h
>