um: Fix PTRACE_POKEUSER on x86_64

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commit 9abc74a22d 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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Richard Weinberger 2017-04-01 00:41:57 +02:00 • committed by Ben Hutchings

parent 2080cbfa94

commit 0d669d90c1

1 changed files with 1 additions and 1 deletions

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arch/x86/um/ptrace_64.c

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