From c58b2c46505568ac70aadffc338a7a90272c6d4b Mon Sep 17 00:00:00 2001
From: Richard Weinberger <richard@nod.at>
Date: Sat, 1 Apr 2017 00:41:57 +0200
Subject: [PATCH] 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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