linux-kernel - [PATCH v1 5/8] x86/entry/clearregs: Clear registers for 64bit exceptions/interrupts

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Date:   Tue,  9 Jan 2018 17:03:25 -0800
From:   Andi Kleen <andi@...stfloor.org>
To:     tglx@...utronix.de
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, dwmw@...zon.co.uk, pjt@...gle.com,
        luto@...nel.org, peterz@...radead.org, thomas.lendacky@....com,
        tim.c.chen@...ux.intel.com, gregkh@...ux-foundation.org,
        dave.hansen@...el.com, jikos@...nel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH v1 5/8] x86/entry/clearregs: Clear registers for 64bit exceptions/interrupts

From: Andi Kleen <ak@...ux.intel.com>

Clear all registers on entering the 64bit kernel for exceptions and
interrupts.

Since there are no arguments this is fairly simple.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 arch/x86/entry/entry_64.S | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 632081fd7086..6ab4c2aaeabb 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -636,6 +636,7 @@ END(irq_entries_start)
 	ALLOC_PT_GPREGS_ON_STACK
 	SAVE_C_REGS
 	SAVE_EXTRA_REGS
+	CLEAR_ALL_REGS
 	ENCODE_FRAME_POINTER
 
 	testb	$3, CS(%rsp)
@@ -1192,6 +1193,7 @@ ENTRY(xen_failsafe_callback)
 	ALLOC_PT_GPREGS_ON_STACK
 	SAVE_C_REGS
 	SAVE_EXTRA_REGS
+	CLEAR_ALL_REGS
 	ENCODE_FRAME_POINTER
 	jmp	error_exit
 END(xen_failsafe_callback)
@@ -1237,6 +1239,7 @@ ENTRY(paranoid_entry)
 	cld
 	SAVE_C_REGS 8
 	SAVE_EXTRA_REGS 8
+	CLEAR_ALL_REGS
 	ENCODE_FRAME_POINTER 8
 	movl	$1, %ebx
 	movl	$MSR_GS_BASE, %ecx
@@ -1289,6 +1292,7 @@ ENTRY(error_entry)
 	cld
 	SAVE_C_REGS 8
 	SAVE_EXTRA_REGS 8
+	CLEAR_ALL_REGS
 	ENCODE_FRAME_POINTER 8
 	xorl	%ebx, %ebx
 	testb	$3, CS+8(%rsp)
@@ -1487,6 +1491,7 @@ ENTRY(nmi)
 	pushq	%r14		/* pt_regs->r14 */
 	pushq	%r15		/* pt_regs->r15 */
 	UNWIND_HINT_REGS
+	CLEAR_ALL_REGS
 	ENCODE_FRAME_POINTER
 
 	/*
-- 
2.14.3