tree 8756fec6c654dd65fb7e6783e7d7fc7db4761617
parent 1c8a946bf3754a59cba1fc373949a8114bfe5aaa
author Dave Martin <Dave.Martin@arm.com> 1484756720 +0000
committer Catalin Marinas <catalin.marinas@arm.com> 1484762702 +0000

arm64/ptrace: Preserve previous registers for short regset write

Ensure that if userspace supplies insufficient data to
PTRACE_SETREGSET to fill all the registers, the thread's old
registers are preserved.

Cc: <stable@vger.kernel.org> # 3.7.x-
Fixes: 478fcb2cdb23 ("arm64: Debugging support")
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Will Deacon <Will.Deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>