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um: Fix PTRACE_POKEUSER on x86_64
authorRichard Weinberger <richard@nod.at>
Fri, 31 Mar 2017 22:41:57 +0000 (00:41 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 20 May 2017 12:30:57 +0000 (14:30 +0200)
commit29d07bb20ee5954d87e78e808fac9503652b3ec6
tree394d118aeec99ff3cff011c6729d4197e258c277tree | snapshot
parentefbd8cc8f6f8ddb81079c0e416358d101f46f5e7commit | diff
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/x86/um/ptrace_64.c diff | blob | history
wrapfs-4.10.y