linux-kernel - Re: [PATCH] Yama: handle 32-bit userspace prctl

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Message-ID: <alpine.LRH.2.02.1209080125240.7301@tundra.namei.org>
Date:	Sat, 8 Sep 2012 01:25:36 +1000 (EST)
From:	James Morris <jmorris@...ei.org>
To:	Kees Cook <keescook@...omium.org>
cc:	linux-kernel@...r.kernel.org,
	James Morris <james.l.morris@...cle.com>,
	John Johansen <john.johansen@...onical.com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCH] Yama: handle 32-bit userspace prctl

On Mon, 27 Aug 2012, Kees Cook wrote:

> When running a 64-bit kernel and receiving prctls from a 32-bit
> userspace, the "-1" used as an unsigned long will end up being
> misdetected. The kernel is looking for 0xffffffffffffffff instead of
> 0xffffffff. Since prctl lacks a distinct compat interface, Yama needs
> to handle this translation itself. As such, support either value as
> meaning PR_SET_PTRACER_ANY, to avoid breaking the ABI for 64-bit.
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>
> Cc: stable@...r.kernel.org

Applied to
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security.git next

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