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authorArnd Bergmann <[email protected]>2019-08-02 21:48:54 -0700
committerLinus Torvalds <[email protected]>2019-08-03 07:02:00 -0700
commitebb6d35a74ce21ce1673b8f404c1039d5a1e7e2d (patch)
tree2a777b400779b4d25eef0137ecd65faf270b48ab
parent670105a25608affe01cb0ccdc2a1f4bd2327172b (diff)
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/[email protected] Fixes: 6baec880d7a5 ("kasan: turn off asan-stack for clang-8 and earlier") Signed-off-by: Arnd Bergmann <[email protected]> Acked-by: Nick Desaulniers <[email protected]> Reviewed-by: Mark Brown <[email protected]> Reviewed-by: Andrey Ryabinin <[email protected]> Cc: Qian Cai <[email protected]> Cc: Andrey Konovalov <[email protected]> Cc: Vasily Gorbik <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
-rw-r--r--lib/Kconfig.kasan11
1 files changed, 5 insertions, 6 deletions
diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
index 4fafba1a923b..7fa97a8b5717 100644
--- a/lib/Kconfig.kasan
+++ b/lib/Kconfig.kasan
@@ -106,7 +106,6 @@ 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
@@ -115,11 +114,11 @@ 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