| Message ID | 20210308184656.1914947-1-samitolvanen@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | kbuild: Allow LTO to be selected with KASAN_HW_TAGS | expand |
On Mon, Mar 08, 2021 at 10:46:56AM -0800, Sami Tolvanen wrote: > While LTO with KASAN is normally not useful, hardware tag-based KASAN > can be used also in production kernels with ARM64_MTE. Therefore, allow > KASAN_HW_TAGS to be selected together with HAS_LTO_CLANG. > > Reported-by: Alistair Delva <adelva@google.com> > Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Kees Cook <keescook@chromium.org>
On Tue, Mar 9, 2021 at 6:39 AM Kees Cook <keescook@chromium.org> wrote: > > On Mon, Mar 08, 2021 at 10:46:56AM -0800, Sami Tolvanen wrote: > > While LTO with KASAN is normally not useful, hardware tag-based KASAN > > can be used also in production kernels with ARM64_MTE. Therefore, allow > > KASAN_HW_TAGS to be selected together with HAS_LTO_CLANG. > > > > Reported-by: Alistair Delva <adelva@google.com> > > Signed-off-by: Sami Tolvanen <samitolvanen@google.com> > > Reviewed-by: Kees Cook <keescook@chromium.org> > > -- > Kees Cook Applied to linux-kbuild/fixes. Thanks.
diff --git a/arch/Kconfig b/arch/Kconfig index 2bb30673d8e6..2e7139b39e8f 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -638,7 +638,7 @@ config HAS_LTO_CLANG depends on $(success,$(AR) --help | head -n 1 | grep -qi llvm) depends on ARCH_SUPPORTS_LTO_CLANG depends on !FTRACE_MCOUNT_USE_RECORDMCOUNT - depends on !KASAN + depends on !KASAN || KASAN_HW_TAGS depends on !GCOV_KERNEL help The compiler and Kconfig options support building with Clang's
While LTO with KASAN is normally not useful, hardware tag-based KASAN can be used also in production kernels with ARM64_MTE. Therefore, allow KASAN_HW_TAGS to be selected together with HAS_LTO_CLANG. Reported-by: Alistair Delva <adelva@google.com> Signed-off-by: Sami Tolvanen <samitolvanen@google.com> --- arch/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) base-commit: 144c79ef33536b4ecb4951e07dbc1f2b7fa99d32