linux-kernel - Re: [PATCH] dma: stm32: replace "%p" with "%pK"

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Date:   Sat, 7 Jul 2018 13:28:01 +0200
From:   Benjamin Gaignard <benjamin.gaignard@...aro.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     vkoul@...nel.org, Dan Williams <dan.j.williams@...el.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        dmaengine@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Benjamin Gaignard <benjamin.gaignard@...com>
Subject: Re: [PATCH] dma: stm32: replace "%p" with "%pK"

2018-07-06 21:38 GMT+02:00 Geert Uytterhoeven <geert@...ux-m68k.org>:
> Hi Benjamin,
>
> On Fri, Jul 6, 2018 at 3:03 PM Benjamin Gaignard
> <benjamin.gaignard@...aro.org> wrote:
>> The format specifier "%p" can leak kernel addresses.
>> Use "%pK" instead.
>
> Still? Isn't the value randomized these days?

%p give an hashed value, with %pK you can use a sysctl to get the real
value if you are root

>
> 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



-- 
Benjamin Gaignard

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