From: Richard Weinberger <richard@nod.at>
Date: Fri, 31 Mar 2017 22:41:57 +0000 (+0200)
Subject: um: Fix PTRACE_POKEUSER on x86_64
X-Git-Tag: v3.2.92~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c58b2c46505568ac70aadffc338a7a90272c6d4b;p=pandora-kernel.git

um: Fix PTRACE_POKEUSER on x86_64

commit 9abc74a22d85ab29cef9896a2582a530da7e79bf upstream.

This is broken since ever but sadly nobody noticed.
Recent versions of GDB set DR_CONTROL unconditionally and
UML dies due to a heap corruption. It turns out that
the PTRACE_POKEUSER was copy&pasted from i386 and assumes
that addresses are 4 bytes long.

Fix that by using 8 as address size in the calculation.

Reported-by: jie cao <cj3054@gmail.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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