From 7a7b7ed8080631393b27e6a00e2039666227c018 Mon Sep 17 00:00:00 2001 From: Sergey Matyukevich Date: Tue, 26 Jul 2022 17:39:15 +0800 Subject: [PATCH] ARC: entry: fix syscall_trace_exit argument 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=5580b974a84b30f6da90a3a562ea0dbfb0038110 -------------------------------- 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: Signed-off-by: Sergey Matyukevich Signed-off-by: Vineet Gupta Signed-off-by: Greg Kroah-Hartman Signed-off-by: Zheng Zengkai Acked-by: Xie XiuQi --- 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 -- GitLab