linux-kernel - [PATCH AUTOSEL 5.2 077/185] kasan/arm64: fix CONFIG_KASAN_SW_TAGS && KASAN

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Message-Id: <20190922184924.32534-77-sashal@kernel.org>
Date:   Sun, 22 Sep 2019 14:47:35 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Will Deacon <will@...nel.org>, Sasha Levin <sashal@...nel.org>,
        kasan-dev@...glegroups.com, linux-kbuild@...r.kernel.org
Subject: [PATCH AUTOSEL 5.2 077/185] kasan/arm64: fix CONFIG_KASAN_SW_TAGS && KASAN_INLINE

From: Mark Rutland <mark.rutland@....com>

[ Upstream commit 34b5560db40d2941cfbe82eca1641353d5aed1a9 ]

The generic Makefile.kasan propagates CONFIG_KASAN_SHADOW_OFFSET into
KASAN_SHADOW_OFFSET, but only does so for CONFIG_KASAN_GENERIC.

Since commit:

  6bd1d0be0e97936d ("arm64: kasan: Switch to using KASAN_SHADOW_OFFSET")

... arm64 defines CONFIG_KASAN_SHADOW_OFFSET in Kconfig rather than
defining KASAN_SHADOW_OFFSET in a Makefile. Thus, if
CONFIG_KASAN_SW_TAGS && KASAN_INLINE are selected, we get build time
splats due to KASAN_SHADOW_OFFSET not being set:

| [mark@...rids:~/src/linux]% usellvm 8.0.1 usekorg 8.1.0  make ARCH=arm64 CROSS_COMPILE=aarch64-linux- CC=clang
| scripts/kconfig/conf  --syncconfig Kconfig
|   CC      scripts/mod/empty.o
| clang (LLVM option parsing): for the -hwasan-mapping-offset option: '' value invalid for uint argument!
| scripts/Makefile.build:273: recipe for target 'scripts/mod/empty.o' failed
| make[1]: *** [scripts/mod/empty.o] Error 1
| Makefile:1123: recipe for target 'prepare0' failed
| make: *** [prepare0] Error 2

Let's fix this by always propagating CONFIG_KASAN_SHADOW_OFFSET into
KASAN_SHADOW_OFFSET if CONFIG_KASAN is selected, moving the existing
common definition of +CFLAGS_KASAN_NOSANITIZE to the top of
Makefile.kasan.

Cc: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Mark Rutland <mark.rutland@....com>
Acked-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
Tested-by Steve Capper <steve.capper@....com>
Signed-off-by: Will Deacon <will@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 scripts/Makefile.kasan | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/scripts/Makefile.kasan b/scripts/Makefile.kasan
index 6410bd22fe387..03757cc60e06c 100644
--- a/scripts/Makefile.kasan
+++ b/scripts/Makefile.kasan
@@ -1,4 +1,9 @@
 # SPDX-License-Identifier: GPL-2.0
+ifdef CONFIG_KASAN
+CFLAGS_KASAN_NOSANITIZE := -fno-builtin
+KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
+endif
+
 ifdef CONFIG_KASAN_GENERIC

 ifdef CONFIG_KASAN_INLINE
@@ -7,8 +12,6 @@ else
 	call_threshold := 0
 endif

-KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
-
 CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address

 cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
@@ -45,7 +48,3 @@ CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
 		$(instrumentation_flags)

 endif # CONFIG_KASAN_SW_TAGS
-
-ifdef CONFIG_KASAN
-CFLAGS_KASAN_NOSANITIZE := -fno-builtin
-endif
-- 
2.20.1