linux-kernel - Re: [PATCH] Fix stack memory disclosure

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Date:   Fri, 11 Jan 2019 13:45:09 +0100
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Kees Cook <keescook@...omium.org>,
        Vlad Tsyrklevich <vlad@...rklevich.net>
Cc:     linux-fbdev@...r.kernel.org,
        Security Officers <security@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Fix stack memory disclosure


On 01/10/2019 04:10 PM, Bartlomiej Zolnierkiewicz wrote:
> 
> On 01/09/2019 12:41 AM, Kees Cook wrote:
>> On Sat, Jan 5, 2019 at 11:51 PM Vlad Tsyrklevich <vlad@...rklevich.net> wrote:
>>>
>>> Using [1] for static analysis I found that the OMAPFB_QUERY_PLANE,
>>> OMAPFB_GET_COLOR_KEY, OMAPFB_GET_DISPLAY_INFO, and OMAPFB_GET_VRAM_INFO
>>> cases could all leak uninitialized stack memory--either due to
>>> uninitialized padding or 'reserved' fields.
>>>
>>> Fix them by clearing the shared union used to store copied out data.
>>>
>>> [1] https://github.com/vlad902/kernel-uninitialized-memory-checker
>>>
>>> Signed-off-by: Vlad Tsyrklevich <vlad@...rklevich.net>
>>
>> Reviewed-by: Kees Cook <keescook@...omium.org>
>> Fixes: b39a982ddecf ("OMAP: DSS2: omapfb driver")
> 
> Thanks.
> 
>> Since this driver is orphaned (according to MAINTAINERS), I think this
>> fix should go via Bart's tree. Bart, can you take this?
> 
> Sure, I will merge it tomorrow (I plan to send fbdev fixes pull request to
> Linus next week).

Patch queued for 5.0 (with patch subject prefixed with "omap2fb: "), thanks.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics