linux-kernel - Re: [PATCH] pinctrl: samsung: Validate alias coming from DT

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Message-ID: <CACRpkdbAhPdpRTx0P3yvazGgRvtUMmJ-qese1LFoCqNSPuR+sw@mail.gmail.com>
Date:   Thu, 1 Mar 2018 23:33:01 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Tomasz Figa <tomasz.figa@...il.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Kukjin Kim <kgene@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        stable <stable@...r.kernel.org>
Subject: Re: [PATCH] pinctrl: samsung: Validate alias coming from DT

On Tue, Feb 20, 2018 at 7:17 PM, Krzysztof Kozlowski <krzk@...nel.org> wrote:

> Driver uses alias from Device Tree as an index of pin controller data
> array.  In case of a wrong DTB or an out-of-tree DTB, the alias could be
> outside of this data array leading to out-of-bounds access.
>
> Depending on binary and memory layout, this could be handled properly
> (showing error like "samsung-pinctrl 3860000.pinctrl: driver data not
> available") or could lead to exceptions.
>
> Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: <stable@...r.kernel.org>
> Fixes: 30574f0db1b1 ("pinctrl: add samsung pinctrl and gpiolib driver")
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
>
> ---
>
> Issue is present since first version of this driver so this should be
> backported as far as possible.
>
> Tested on Odroid HC1 (Exynos5422). Tests on S3C24xx, S3C64xx, Exynos
> ARM64 and any other chips are highly appreciated.
>
> Linus,
> I can take it through samsung/pinctrl tree and later send you again as
> pull request... or you can apply it directly as I do not have any other
> pinctrl patches queued so far.

Patch applied for fixes with all the tags.

Yours,
Linus Walleij