linux-kernel - [PATCH 4.9 20/24] ARC: entry: fix syscall_trace

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Date:   Tue, 26 Apr 2022 10:21:14 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Sergey Matyukevich <sergey.matyukevich@...opsys.com>,
        Vineet Gupta <vgupta@...nel.org>
Subject: [PATCH 4.9 20/24] ARC: entry: fix syscall_trace_exit argument

From: Sergey Matyukevich <sergey.matyukevich@...opsys.com>

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@...r.kernel.org>
Signed-off-by: Sergey Matyukevich <sergey.matyukevich@...opsys.com>
Signed-off-by: Vineet Gupta <vgupta@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arc/kernel/entry.S |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/arc/kernel/entry.S
+++ b/arch/arc/kernel/entry.S
@@ -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