linux-kernel - Re: [PATCH] drm: tests: Fix a buffer overflow in format_helper

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Message-ID: <0a8e925f-4ad7-82ab-dd16-b2c0bf5aba48@redhat.com>
Date:   Wed, 19 Oct 2022 18:14:51 +0200
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Maíra Canal <mairacanal@...eup.net>,
        David Gow <davidgow@...gle.com>,
        José Expósito <jose.exposito89@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Maxime Ripard <maxime@...no.tech>,
        Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Linux Kernel Functional Testing <lkft@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>, kunit-dev@...glegroups.com
Subject: Re: [PATCH] drm: tests: Fix a buffer overflow in format_helper_test

On 10/19/22 13:36, Maíra Canal wrote:
> [cc Javier]
> 
> Hi David,
> 
> On 10/19/22 04:32, David Gow wrote:
>> The xrgb2101010 format conversion test (unlike for other formats) does
>> an endianness conversion on the results. However, it always converts
>> TEST_BUF_SIZE 32-bit integers, which results in reading from (and
>> writing to) more memory than in present in the result buffer. Instead,
>> use the buffer size, divided by sizeof(u32).
>>
>> The issue could be reproduced with KASAN:
>> ./tools/testing/kunit/kunit.py run --kunitconfig drivers/gpu/drm/tests \
>> 	--kconfig_add CONFIG_KASAN=y --kconfig_add CONFIG_KASAN_VMALLOC=y \
>> 	--kconfig_add CONFIG_KASAN_KUNIT_TEST=y \
>> 	drm_format_helper_test.*xrgb2101010
>>
>> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
>> Fixes: 453114319699 ("drm/format-helper: Add KUnit tests for drm_fb_xrgb8888_to_xrgb2101010()")
>> Signed-off-by: David Gow <davidgow@...gle.com>
> 
> Reviewed-by: Maíra Canal <mairacanal@...eup.net>
>

The fix makes sense to me as well,

Reviewed-by: Javier Martinez Canillas <javierm@...hat.com>

>> ---
>>
>> This is a fix for the issue reported here:
>> https://lore.kernel.org/dri-devel/CA+G9fYsuc9G+RO81E=vHMqxYStsmLURLdOB0NF26kJ1=K8pRZA@mail.gmail.com/
>>
>> Note that it may conflict with the KUNIT_EXPECT_MEMEQ() series here:
>> https://lore.kernel.org/linux-kselftest/20221018190541.189780-1-mairacanal@riseup.net/
> 
> I believe this patch will go to the drm-misc-fixes tree, so I can rebase
> the series (and address the format issues) as this patch hits mainline.
> 

Awesome. I assume you are pushing to drm-misc-fixes then?

Thanks a lot David and Maíra for taking care of this!

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat