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

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Date:   Fri, 21 Oct 2022 15:37:59 +0800
From:   David Gow <davidgow@...gle.com>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     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>,
        Maíra Canal <mairacanal@...eup.net>,
        dri-devel@...ts.freedesktop.org, Sam Ravnborg <sam@...nborg.org>,
        linux-kernel@...r.kernel.org, kunit-dev@...glegroups.com,
        Linux Kernel Functional Testing <lkft@...aro.org>
Subject: Re: [PATCH] drm: tests: Fix a buffer overflow in format_helper_test

On Thu, Oct 20, 2022 at 4:03 PM Javier Martinez Canillas
<javierm@...hat.com> wrote:
>
> On 10/19/22 19:29, José Expósito wrote:
>
> [...]
>
> >>  drivers/gpu/drm/tests/drm_format_helper_test.c | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/gpu/drm/tests/drm_format_helper_test.c b/drivers/gpu/drm/tests/drm_format_helper_test.c
> >> index 8d86c250c2ec..2191e57f2297 100644
> >> --- a/drivers/gpu/drm/tests/drm_format_helper_test.c
> >> +++ b/drivers/gpu/drm/tests/drm_format_helper_test.c
> >> @@ -438,7 +438,7 @@ static void drm_test_fb_xrgb8888_to_xrgb2101010(struct kunit *test)
> >>      iosys_map_set_vaddr(&src, xrgb8888);
> >>
> >>      drm_fb_xrgb8888_to_xrgb2101010(&dst, &result->dst_pitch, &src, &fb, &params->clip);
> >> -    buf = le32buf_to_cpu(test, buf, TEST_BUF_SIZE);
> >> +    buf = le32buf_to_cpu(test, buf, dst_size / sizeof(u32));
> >>      KUNIT_EXPECT_EQ(test, memcmp(buf, result->expected, dst_size), 0);
> >>  }
> >
> > Thanks a lot for fixing this bug David, I just tested it and
> > worked as expected.
> >
>
> I've pushed this to drm-misc (drm-misc-fixes) now. Thanks!
>

Thanks very much!

> > Do you think that we should update the other calls to
> > le32buf_to_cpu() to follow a similar approach?
> >
>
> Feel free to post follow-up patches if you think that other changes are needed.
>

I _think_ this should be the only actually necessary change. Maybe
there's some cleanup of the way TEST_BUF_SIZE is used, or the sparse
annotations for endianness, but I'd need to look into exactly what the
various drm_format definitions are in more detail to know for sure.

Cheers,
-- David

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