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arm64/ptrace: Preserve previous registers for short regset write

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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> # 4.3.x-
Fixes: 5d220ff942 ("arm64: Better native ptrace support for compat tasks")
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>
This commit is contained in:
Dave Martin 2017-01-18 16:25:22 +00:00 committed by Catalin Marinas
parent 9dd73f72f2
commit a672401c00
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kernel/ptrace.c
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@ -950,7 +950,7 @@ static int compat_tls_set(struct task_struct *target,
const void __user *ubuf)
{
int ret;
compat_ulong_t tls;
compat_ulong_t tls = target->thread.tp_value;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
if (ret)