From: Sergey Matyukevich <sergey.matyukevich@synopsys.com> stable inclusion from stable-v5.10.113 commit 5580b974a84b30f6da90a3a562ea0dbfb0038110 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5ISAH Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- 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> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> Acked-by: Xie XiuQi <xiexiuqi@huawei.com> --- arch/arc/kernel/entry.S | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arc/kernel/entry.S b/arch/arc/kernel/entry.S index ae656bfc31c3..301ade4d0b94 100644 --- a/arch/arc/kernel/entry.S +++ b/arch/arc/kernel/entry.S @@ -199,6 +199,7 @@ 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 -- 2.20.1