The patch titled
Subject: kasan: remove hwasan-kernel-mem-intrinsic-prefix=1 for clang-14
has been added to the -mm mm-unstable branch. Its filename is
kasan-remove-hwasan-kernel-mem-intrinsic-prefix=1-for-clang-14.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kasan-remove-hwasan-kernel-mem-intrinsic-prefix=1-for-clang-14.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Arnd Bergmann <arnd@xxxxxxxx>
Subject: kasan: remove hwasan-kernel-mem-intrinsic-prefix=1 for clang-14
Date: Tue, 18 Apr 2023 14:23:35 +0200
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.
Link: https://lkml.kernel.org/r/20230418122350.1646391-1-arnd@xxxxxxxxxx
Fixes: 51287dcb00cc ("kasan: emit different calls for instrumentable memintrinsics")
Link: https://lore.kernel.org/all/CANpmjNMwYosrvqh4ogDO8rgn+SeDHM2b-shD21wTypm_6MMe=g@xxxxxxxxxxxxxx/
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Reviewed-by: Marco Elver <elver@xxxxxxxxxx>
Reviewed-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Konovalov <andreyknvl@xxxxxxxxx>
Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Cc: Nicolas Schier <nicolas@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Tom Rix <trix@xxxxxxxxxx>
Cc: Vincenzo Frascino <Vincenzo.Frascino@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
scripts/Makefile.kasan | 2 ++
1 file changed, 2 insertions(+)
--- a/scripts/Makefile.kasan~kasan-remove-hwasan-kernel-mem-intrinsic-prefix=1-for-clang-14
+++ a/scripts/Makefile.kasan
@@ -69,7 +69,9 @@ CFLAGS_KASAN := -fsanitize=kernel-hwaddr
$(instrumentation_flags)
# Instrument memcpy/memset/memmove calls by using instrumented __hwasan_mem*().
+ifeq ($(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
_
Patches currently in -mm which might be from arnd@xxxxxxxx are
mm-make-arch_has_descending_max_zone_pfns-static.patch
mm-make-arch_has_descending_max_zone_pfns-static-v2.patch
kasan-remove-hwasan-kernel-mem-intrinsic-prefix=1-for-clang-14.patch
