Commit 7a3767f8 authored by Marco Elver's avatar Marco Elver Committed by Linus Torvalds
Browse files

kasan: improve and simplify Kconfig.kasan 



Turn 'KASAN' into a menuconfig, to avoid cluttering its parent menu with
the suboptions if enabled.  Use 'if KASAN ...  endif' instead of having to
'depend on KASAN' for each entry.

Signed-off-by: default avatarMarco Elver <elver@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: default avatarAndrey Konovalov <andreyknvl@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Daniel Axtens <dja@axtens.net>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Walter Wu <walter-zh.wu@mediatek.com>
Link: http://lkml.kernel.org/r/20200629104157.3242503-1-elver@google.com


Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9c801f61

lib/Kconfig.kasan

+8 −7
Original line number Diff line number Diff line
@@ -18,7 +18,7 @@ config CC_HAS_KASAN_SW_TAGS 
config CC_HAS_WORKING_NOSANITIZE_ADDRESS

	def_bool !CC_IS_GCC || GCC_VERSION >= 80300



config KASAN

menuconfig KASAN

	bool "KASAN: runtime memory debugger"

	depends on (HAVE_ARCH_KASAN && CC_HAS_KASAN_GENERIC) || \

		   (HAVE_ARCH_KASAN_SW_TAGS && CC_HAS_KASAN_SW_TAGS)
@@ -29,9 +29,10 @@ config KASAN 
	  designed to find out-of-bounds accesses and use-after-free bugs.

	  See Documentation/dev-tools/kasan.rst for details.



if KASAN



choice

	prompt "KASAN mode"

	depends on KASAN

	default KASAN_GENERIC

	help

	  KASAN has two modes: generic KASAN (similar to userspace ASan,
@@ -88,7 +89,6 @@ endchoice 


choice

	prompt "Instrumentation type"

	depends on KASAN

	default KASAN_OUTLINE



config KASAN_OUTLINE
@@ -113,7 +113,6 @@ endchoice 


config KASAN_STACK_ENABLE

	bool "Enable stack instrumentation (unsafe)" if CC_IS_CLANG && !COMPILE_TEST

	depends on KASAN

	help

	  The LLVM stack address sanitizer has a know problem that

	  causes excessive stack usage in a lot of functions, see
@@ -134,7 +133,7 @@ config KASAN_STACK 


config KASAN_S390_4_LEVEL_PAGING

	bool "KASan: use 4-level paging"

	depends on KASAN && S390

	depends on S390

	help

	  Compiling the kernel with KASan disables automatic 3-level vs

	  4-level paging selection. 3-level paging is used by default (up
@@ -151,7 +150,7 @@ config KASAN_SW_TAGS_IDENTIFY 


config KASAN_VMALLOC

	bool "Back mappings in vmalloc space with real shadow memory"

	depends on KASAN && HAVE_ARCH_KASAN_VMALLOC

	depends on HAVE_ARCH_KASAN_VMALLOC

	help

	  By default, the shadow region for vmalloc space is the read-only

	  zero page. This means that KASAN cannot detect errors involving
@@ -164,8 +163,10 @@ config KASAN_VMALLOC 


config TEST_KASAN

	tristate "Module for testing KASAN for bug detection"

	depends on m && KASAN

	depends on m

	help

	  This is a test module doing various nasty things like

	  out of bounds accesses, use after free. It is useful for testing

	  kernel debugging features like KASAN.



endif # KASAN

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