linux-kernel - Re: [PATCH 073/190] Revert "media: rcar

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Message-ID: <CAMuHMdVFf3_jo+oGPm4THhan3bVZx99omkG1LnAp=B4JTKhChA@mail.gmail.com>
Date:   Wed, 21 Apr 2021 20:58:22 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kangjie Lu <kjlu@....edu>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>
Subject: Re: [PATCH 073/190] Revert "media: rcar_drif: fix a memory disclosure"

Hi Greg,

On Wed, Apr 21, 2021 at 3:06 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> This reverts commit d39083234c60519724c6ed59509a2129fd2aed41.
>
> Commits from @umn.edu addresses have been found to be submitted in "bad
> faith" to try to test the kernel community's ability to review "known
> malicious" changes.  The result of these submissions can be found in a
> paper published at the 42nd IEEE Symposium on Security and Privacy
> entitled, "Open Source Insecurity: Stealthily Introducing
> Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
> of Minnesota) and Kangjie Lu (University of Minnesota).
>
> Because of this, all submissions from this group must be reverted from
> the kernel tree and will need to be re-reviewed again to determine if
> they actually are a valid fix.  Until that work is complete, remove this
> change to ensure that no problems are being introduced into the
> codebase.
>
> Cc: Kangjie Lu <kjlu@....edu>
> Cc: Geert Uytterhoeven <geert+renesas@...der.be>
> Cc: Hans Verkuil <hverkuil-cisco@...all.nl>
> Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Upon a second look, I still see nothing wrong with the original commit.
However, as I'm no v4l expert, I'd like to defer to the experts for final
judgement.

> --- a/drivers/media/platform/rcar_drif.c
> +++ b/drivers/media/platform/rcar_drif.c
> @@ -915,7 +915,6 @@ static int rcar_drif_g_fmt_sdr_cap(struct file *file, void *priv,
>  {
>         struct rcar_drif_sdr *sdr = video_drvdata(file);
>
> -       memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
>         f->fmt.sdr.pixelformat = sdr->fmt->pixelformat;
>         f->fmt.sdr.buffersize = sdr->fmt->buffersize;
>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds