Commit 228dbbfb authored Jan 18, 2017 by Dave Martin Committed by Russell King Jan 30, 2017

ARM: 8643/3: arm/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> # 3.0.x-
Fixes: 5be6f62b ("ARM: 6883/1: ptrace: Migrate to regsets framework")
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

parent 97a98ae5

arch/arm/kernel/ptrace.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -600,7 +600,7 @@ static int gpr_set(struct task_struct *target,
		const void kbuf, const void __user ubuf)
		{
		int ret;
		struct pt_regs newregs;
		struct pt_regs newregs = *task_pt_regs(target);

		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
		&newregs,