Commit a672401c authored Jan 18, 2017 by Dave Martin Committed by Catalin Marinas Jan 18, 2017

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> # 4.3.x-
Fixes: 5d220ff9 ("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>

parent 9dd73f72

arch/arm64/kernel/ptrace.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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)