On Fri, Jul 19, 2019 at 1:03 PM Arnd Bergmann <a...@arndb.de> wrote: > > 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.
Acked-by: Nick Desaulniers <ndesaulni...@google.com> > > 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 > Fixes: 6baec880d7a5 ("kasan: turn off asan-stack for clang-8 and earlier") > Signed-off-by: Arnd Bergmann <a...@arndb.de> > --- > v2: disable the feature for all clang versions, not just 9 and below. > --- > lib/Kconfig.kasan | 11 +++++------ > 1 file 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 > -- > 2.20.0 > > -- > You received this message because you are subscribed to the Google Groups > "Clang Built Linux" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clang-built-linux+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/clang-built-linux/20190719200347.2596375-1-arnd%40arndb.de. -- Thanks, ~Nick Desaulniers
