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Commit fdf14d23 authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Greg Kroah-Hartman
Browse files

UPSTREAM: kasan: remove clang version check for KASAN_STACK 

asan-stack mode still uses dangerously large kernel stacks of tens of
kilobytes in some drivers, and it does not seem that anyone is working
on the clang bug.

Turn it off for all clang versions to prevent users from accidentally
enabling it once they update to clang-9, and to help automated build
testing with clang-9.

Link: https://bugs.llvm.org/show_bug.cgi?id=38809
Link: http://lkml.kernel.org/r/20190719200347.2596375-1-arnd@arndb.de


Fixes: 6baec880d7a5 ("kasan: turn off asan-stack for clang-8 and earlier")
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarNick Desaulniers <ndesaulniers@google.com>
Reviewed-by: default avatarMark Brown <broonie@kernel.org>
Reviewed-by: default avatarAndrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Qian Cai <cai@lca.pw>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit ebb6d35a74ce21ce1673b8f404c1039d5a1e7e2d)
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@google.com>
Change-Id: I402d4d41933caa118effce21dba82c895812200d
parent 7783c5c8

lib/Kconfig.kasan

+5 −6
Original line number Diff line number Diff line
@@ -105,7 +105,6 @@ endchoice 


config KASAN_STACK_ENABLE

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

	default !(CLANG_VERSION < 90000)

	depends on KASAN

	help

	  The LLVM stack address sanitizer has a know problem that
@@ -114,11 +113,11 @@ config KASAN_STACK_ENABLE 
	  Disabling asan-stack makes it safe to run kernels build

	  with clang-8 with KASAN enabled, though it loses some of

	  the functionality.

	  This feature is always disabled when compile-testing with clang-8

	  or earlier to avoid cluttering the output in stack overflow

	  warnings, but clang-8 users can still enable it for builds without

	  CONFIG_COMPILE_TEST.  On gcc and later clang versions it is

	  assumed to always be safe to use and enabled by default.

	  This feature is always disabled when compile-testing with clang

	  to avoid cluttering the output in stack overflow warnings,

	  but clang users can still enable it for builds without

	  CONFIG_COMPILE_TEST.	On gcc it is assumed to always be safe

	  to use and enabled by default.



config KASAN_STACK

	int