Commit 2e5893f6 authored Apr 14, 2022 by Sergey Matyukevich Committed by Greg Kroah-Hartman Apr 27, 2022

ARC: entry: fix syscall_trace_exit argument



commit b1c6ecfdd06907554518ec384ce8e99889d15193 upstream.

Function syscall_trace_exit expects pointer to pt_regs. However
r0 is also used to keep syscall return value. Restore pointer
to pt_regs before calling syscall_trace_exit.

Cc: <stable@vger.kernel.org>
Signed-off-by: Sergey Matyukevich <sergey.matyukevich@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 5dacfde4

arch/arc/kernel/entry.S

+1 −0

Original line number	Diff line number	Diff line
		@@ -191,6 +191,7 @@ tracesys_exit:
		st r0, [sp, PT_r0] ; sys call return value in pt_regs

		;POST Sys Call Ptrace Hook
		mov r0, sp ; pt_regs needed
		bl @syscall_trace_exit
		b ret_from_exception ; NOT ret_from_system_call at is saves r0 which
		; we'd done before calling post hook above