From: Kees Cook <keescook@chromium.org>
Date: Mon, 27 Aug 2012 18:38:13 +0000 (-0700)
Subject: Yama: handle 32-bit userspace prctl
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~32^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2e4930eb7c8fb20a39dfb5f8a8f80402710dcea8;p=pandora-kernel.git

Yama: handle 32-bit userspace prctl

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@chromium.org>
Acked-by: John Johansen <john.johansen@canonical.com>
Cc: stable@vger.kernel.org
Signed-off-by: James Morris <james.l.morris@oracle.com>
---

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