linux-kernel - Re: [PATCH 3/3] lib/vsprintf: Hash printed address for netdev bits fallback

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Message-ID: <20181009141819.ajng53xs43meudsj@pathway.suse.cz>
Date:   Tue, 9 Oct 2018 16:18:19 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "Tobin C . Harding" <me@...in.cc>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH 3/3] lib/vsprintf: Hash printed address for netdev bits
 fallback

On Mon 2018-10-08 13:05:04, Geert Uytterhoeven wrote:
> The handler for "%pN" falls back to printing the raw pointer value when
> using a different format than the (sole supported) special format
> "%pNF", potentially leaking sensitive information regarding the kernel
> layout in memory.
> 
> Avoid this leak by printing the hashed address instead.
> Note that there are no in-tree users of the fallback.
> 
> Fixes: ad67b74d2469d9b8 ("printk: hash addresses printed with %p")
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>

Great catch!

Reviewed-by: Petr Mladek <pmladek@...e.com>

Best Regards,
Petr