[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <CANpmjNOSi32aN54_=WH1xb4jqzso+-riMomLxoqebO=AdbpHVA@mail.gmail.com>
Date: Tue, 18 Apr 2023 15:07:09 +0200
From: Marco Elver <elver@...gle.com>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Masahiro Yamada <masahiroy@...nel.org>,
Arnd Bergmann <arnd@...db.de>,
Andrey Ryabinin <ryabinin.a.a@...il.com>,
Alexander Potapenko <glider@...gle.com>,
Andrey Konovalov <andreyknvl@...il.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Vincenzo Frascino <vincenzo.frascino@....com>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Nicolas Schier <nicolas@...sle.eu>, Tom Rix <trix@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>,
Michael Ellerman <mpe@...erman.id.au>,
kasan-dev@...glegroups.com, linux-kbuild@...r.kernel.org,
linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] [v2] kasan: remove hwasan-kernel-mem-intrinsic-prefix=1
for clang-14
On Tue, 18 Apr 2023 at 14:24, Arnd Bergmann <arnd@...nel.org> wrote:
>
> From: Arnd Bergmann <arnd@...db.de>
>
> Some unknown -mllvm options (i.e. those starting with the letter "h")
> don't cause an error to be returned by clang, so the cc-option helper
> adds the unknown hwasan-kernel-mem-intrinsic-prefix=1 flag to CFLAGS
> with compilers that are new enough for hwasan but too old for this option.
>
> This causes a rather unreadable build failure:
>
> fixdep: error opening file: scripts/mod/.empty.o.d: No such file or directory
> make[4]: *** [/home/arnd/arm-soc/scripts/Makefile.build:252: scripts/mod/empty.o] Error 2
> fixdep: error opening file: scripts/mod/.devicetable-offsets.s.d: No such file or directory
> make[4]: *** [/home/arnd/arm-soc/scripts/Makefile.build:114: scripts/mod/devicetable-offsets.s] Error 2
>
> Add a version check to only allow this option with clang-15, gcc-13
> or later versions.
>
> Fixes: 51287dcb00cc ("kasan: emit different calls for instrumentable memintrinsics")
> Link: https://lore.kernel.org/all/CANpmjNMwYosrvqh4ogDO8rgn+SeDHM2b-shD21wTypm_6MMe=g@mail.gmail.com/
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
Reviewed-by: Marco Elver <elver@...gle.com>
Thanks!
> ---
> v2: use one-line version check for both clang and gcc, clarify changelog text
> ---
> scripts/Makefile.kasan | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/scripts/Makefile.kasan b/scripts/Makefile.kasan
> index c186110ffa20..390658a2d5b7 100644
> --- a/scripts/Makefile.kasan
> +++ b/scripts/Makefile.kasan
> @@ -69,7 +69,9 @@ CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
> $(instrumentation_flags)
>
> # Instrument memcpy/memset/memmove calls by using instrumented __hwasan_mem*().
> +ifeq ($(call clang-min-version, 150000)$(call gcc-min-version, 130000),y)
> CFLAGS_KASAN += $(call cc-param,hwasan-kernel-mem-intrinsic-prefix=1)
> +endif
>
> endif # CONFIG_KASAN_SW_TAGS
>
> --
> 2.39.2
>
>
Powered by blists - more mailing lists