Re: [PATCH v4 33/45] x86: kmsan: disable instrumentation of unsupported code

Marco Elver
2022-07-12T13:44:22Z

On Fri, 1 Jul 2022 at 16:24, 'Alexander Potapenko' via kasan-dev
<kasan-dev@googlegroups.com> wrote:
[...]
> ---
> arch/x86/boot/Makefile | 1 +
> arch/x86/boot/compressed/Makefile | 1 +
> arch/x86/entry/vdso/Makefile | 3 +++
> arch/x86/kernel/Makefile | 2 ++
> arch/x86/kernel/cpu/Makefile | 1 +
> arch/x86/mm/Makefile | 2 ++
> arch/x86/realmode/rm/Makefile | 1 +
> lib/Makefile | 2 ++
[...]
> --- a/lib/Makefile
> +++ b/lib/Makefile
> @@ -272,6 +272,8 @@ obj-$(CONFIG_POLYNOMIAL) += polynomial.o
> CFLAGS_stackdepot.o += -fno-builtin
> obj-$(CONFIG_STACKDEPOT) += stackdepot.o
> KASAN_SANITIZE_stackdepot.o := n
> +# In particular, instrumenting stackdepot.c with KMSAN will result in infinite
> +# recursion.
> KMSAN_SANITIZE_stackdepot.o := n
> KCOV_INSTRUMENT_stackdepot.o := n

This is generic code and not x86, should it have been in the earlier patch?