linux-hardening - Re: [PATCH][next] ALSA: 6fire: Fix undefined behavior bug in struct comm

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Date: Sun, 1 Oct 2023 08:51:32 +0200
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
 Jussi Kivilinna <jussi.kivilinna@....fi>, alsa-devel@...a-project.org,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] ALSA: 6fire: Fix undefined behavior bug in struct
 comm_runtime

On 9/29/23 19:26, Kees Cook wrote:
> On Fri, Sep 29, 2023 at 05:59:22PM +0200, Gustavo A. R. Silva wrote:
>> `struct urb` is a flexible structure, which means that it contains a
>> flexible-array member at the bottom. This could potentially lead to an
>> overwrite of the objects following `receiver` in `struct comm_runtime`,
>> among them some function pointers.
>>
>> Fix this by placing the declaration of object `receiver` at the end of
>> `struct comm_runtime`.
>>
>> Fixes: ddb6b5a96437 ("ALSA: 6fire: fix DMA issues with URB transfer_buffer usage")
>> Cc: stable@...r.kernel.org
>> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> 
> Should these mention -Wflex-array-member-not-at-end ?

Probably, yes. I wasn't sure about mentioning it because it's not been released yet.

> 
> Reviewed-by: Kees Cook <keescook@...omium.org>
> 

Thanks!
--
Gustavo