linux-kernel - [PATCH 05/11] Disable kasan's instrumentation

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Date:   Wed, 11 Oct 2017 16:22:21 +0800
From:   Abbott Liu <liuwenliang@...wei.com>
To:     <linux@...linux.org.uk>, <aryabinin@...tuozzo.com>,
        <liuwenliang@...wei.com>, <afzal.mohd.ma@...il.com>,
        <f.fainelli@...il.com>, <labbott@...hat.com>,
        <kirill.shutemov@...ux.intel.com>, <mhocko@...e.com>,
        <cdall@...aro.org>, <marc.zyngier@....com>,
        <catalin.marinas@....com>, <akpm@...ux-foundation.org>,
        <mawilcox@...rosoft.com>, <tglx@...utronix.de>,
        <thgarnie@...gle.com>, <keescook@...omium.org>, <arnd@...db.de>,
        <vladimir.murzin@....com>, <tixy@...aro.org>,
        <ard.biesheuvel@...aro.org>, <robin.murphy@....com>,
        <mingo@...nel.org>, <grygorii.strashko@...aro.org>
CC:     <glider@...gle.com>, <dvyukov@...gle.com>, <opendmb@...il.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kasan-dev@...glegroups.com>,
        <linux-mm@...ck.org>, <jiazhenghua@...wei.com>,
        <dylix.dailei@...wei.com>, <zengweilin@...wei.com>,
        <heshaoliang@...wei.com>
Subject: [PATCH 05/11] Disable kasan's instrumentation

From: Andrey Ryabinin <a.ryabinin@...sung.com>

 To avoid some build and runtime errors, compiler's instrumentation must
 be disabled for code not linked with kernel image.

Cc: Andrey Ryabinin <a.ryabinin@...sung.com>
Signed-off-by: Abbott Liu <liuwenliang@...wei.com>
---
 arch/arm/boot/compressed/Makefile | 1 +
 arch/arm/kernel/unwind.c          | 3 ++-
 arch/arm/vdso/Makefile            | 2 ++
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index d50430c..ab5693b 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -23,6 +23,7 @@ OBJS		+= hyp-stub.o
 endif
 
 GCOV_PROFILE		:= n
+KASAN_SANITIZE		:= n
 
 #
 # Architecture dependencies
diff --git a/arch/arm/kernel/unwind.c b/arch/arm/kernel/unwind.c
index 0bee233..2e55c7d 100644
--- a/arch/arm/kernel/unwind.c
+++ b/arch/arm/kernel/unwind.c
@@ -249,7 +249,8 @@ static int unwind_pop_register(struct unwind_ctrl_block *ctrl,
 		if (*vsp >= (unsigned long *)ctrl->sp_high)
 			return -URC_FAILURE;
 
-	ctrl->vrs[reg] = *(*vsp)++;
+	ctrl->vrs[reg] = READ_ONCE_NOCHECK(*(*vsp));
+	(*vsp)++;
 	return URC_OK;
 }
 
diff --git a/arch/arm/vdso/Makefile b/arch/arm/vdso/Makefile
index 59a8fa7..689dfec 100644
--- a/arch/arm/vdso/Makefile
+++ b/arch/arm/vdso/Makefile
@@ -29,6 +29,8 @@ CFLAGS_vgettimeofday.o = -O2
 # Disable gcov profiling for VDSO code
 GCOV_PROFILE := n
 
+KASAN_SANITIZE := n
+
 # Force dependency
 $(obj)/vdso.o : $(obj)/vdso.so
 
-- 
2.9.0