Source-Changes-HG archive
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]
[src/netbsd-9]: src/sys/arch/aarch64 Pull up following revision(s) (requested...
details: https://anonhg.NetBSD.org/src/rev/608564943e7b
branches: netbsd-9
changeset: 963452:608564943e7b
user: martin <martin%NetBSD.org@localhost>
date: Tue Dec 24 17:30:28 2019 +0000
description:
Pull up following revision(s) (requested by ryo in ticket #574):
sys/arch/aarch64/include/asm.h: revision 1.5
sys/arch/aarch64/aarch64/cpuswitch.S: revision 1.13
Add a speculation barrier after the 'eret'.
Some aarch64 cpus speculatively execute instructions after 'eret',
and this potentiates side-channel attack.
from
https://github.com/torvalds/linux/commit/679db70801da9fda91d26caf13bf5b5ccc74e8e8
diffstat:
sys/arch/aarch64/aarch64/cpuswitch.S | 8 ++++----
sys/arch/aarch64/include/asm.h | 10 +++++++++-
2 files changed, 13 insertions(+), 5 deletions(-)
diffs (58 lines):
diff -r f1dce87a9e2f -r 608564943e7b sys/arch/aarch64/aarch64/cpuswitch.S
--- a/sys/arch/aarch64/aarch64/cpuswitch.S Wed Dec 18 20:21:11 2019 +0000
+++ b/sys/arch/aarch64/aarch64/cpuswitch.S Tue Dec 24 17:30:28 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: cpuswitch.S,v 1.11 2018/12/27 09:55:27 mrg Exp $ */
+/* $NetBSD: cpuswitch.S,v 1.11.4.1 2019/12/24 17:30:28 martin Exp $ */
/*-
* Copyright (c) 2014 The NetBSD Foundation, Inc.
@@ -37,7 +37,7 @@
#include "opt_ddb.h"
#include "opt_kasan.h"
-RCSID("$NetBSD: cpuswitch.S,v 1.11 2018/12/27 09:55:27 mrg Exp $")
+RCSID("$NetBSD: cpuswitch.S,v 1.11.4.1 2019/12/24 17:30:28 martin Exp $")
/*
* At IPL_SCHED:
@@ -268,7 +268,7 @@
ldp x1, x2, [x0, #TF_X1]
ldr x0, [x0, #TF_X0]
- eret
+ ERET
END(el1_trap_exit)
#ifdef DDB
END(el1_trap)
@@ -339,7 +339,7 @@
unwind_x0_x2
/* leave sp at l_md.md_utf, return back to EL0 user process */
- eret
+ ERET
END(el0_trap_exit)
#ifdef DDB
END(el0_trap)
diff -r f1dce87a9e2f -r 608564943e7b sys/arch/aarch64/include/asm.h
--- a/sys/arch/aarch64/include/asm.h Wed Dec 18 20:21:11 2019 +0000
+++ b/sys/arch/aarch64/include/asm.h Tue Dec 24 17:30:28 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: asm.h,v 1.3 2018/07/17 18:08:37 christos Exp $ */
+/* $NetBSD: asm.h,v 1.3.4.1 2019/12/24 17:30:28 martin Exp $ */
#ifndef _AARCH64_ASM_H_
#define _AARCH64_ASM_H_
@@ -8,4 +8,12 @@
#define fp x29
#define lr x30
+/*
+ * Add a speculation barrier after the 'eret'.
+ * Some aarch64 cpus speculatively execute instructions after 'eret',
+ * and this potentiates side-channel attacks.
+ */
+#define ERET \
+ eret; dsb sy; isb
+
#endif /* !_AARCH64_ASM_H_ */
Home |
Main Index |
Thread Index |
Old Index