linux-kernel - [PATCH 2/4] efi/runtime-wrappers, kasan: don't sanitize runtime wrappers.

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Date:	Wed, 26 Aug 2015 19:15:05 +0300
From:	Andrey Ryabinin <ryabinin.a.a@...il.com>
To:	Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-arm-kernel@...ts.infradead.org
Cc:	Matt Fleming <matt.fleming@...el.com>, linux-efi@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexander Potapenko <glider@...gle.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	Andrey Ryabinin <ryabinin.a.a@...il.com>
Subject: [PATCH 2/4] efi/runtime-wrappers, kasan: don't sanitize runtime wrappers.

ARM64 maps efi runtime services in userspace addresses
which don't have KASAN shadow. So dereferencing these addresses
in efi_call_virt() will cause crash if this code instrumented.

Signed-off-by: Andrey Ryabinin <ryabinin.a.a@...il.com>
---
 drivers/firmware/efi/Makefile | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile
index 6fd3da9..413fcf2 100644
--- a/drivers/firmware/efi/Makefile
+++ b/drivers/firmware/efi/Makefile
@@ -1,6 +1,14 @@
 #
 # Makefile for linux kernel
 #
+
+#
+# ARM64 maps efi runtime services in userspace addresses
+# which don't have KASAN shadow. So dereference of these addresses
+# in efi_call_virt() will cause crash if this code instrumented.
+#
+KASAN_SANITIZE_runtime-wrappers.o	:= n
+
 obj-$(CONFIG_EFI)			+= efi.o vars.o reboot.o
 obj-$(CONFIG_EFI_VARS)			+= efivars.o
 obj-$(CONFIG_EFI_ESRT)			+= esrt.o
-- 
2.4.6

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