The patch titled
Subject: kasan: remove clang version check for KASAN_STACK
has been added to the -mm tree. Its filename is
kasan-remove-clang-version-check-for-kasan_stack.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kasan-remove-clang-version-check-for-kasan_stack.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kasan-remove-clang-version-check-for-kasan_stack.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Arnd Bergmann <arnd@xxxxxxxx>
Subject: 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@xxxxxxxx
Fixes: 6baec880d7a5 ("kasan: turn off asan-stack for clang-8 and earlier")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Qian Cai <cai@xxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/Kconfig.kasan | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
--- a/lib/Kconfig.kasan~kasan-remove-clang-version-check-for-kasan_stack
+++ a/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
_
Patches currently in -mm which might be from arnd@xxxxxxxx are
kasan-remove-clang-version-check-for-kasan_stack.patch
mm-sparse-fix-memory-leak-of-sparsemap_buf-in-aliged-memory-fix.patch
