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| author | Kefeng Wang <wangkefeng.wang@huawei.com> | 2021-12-11 21:17:34 +0800 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2021-12-14 18:54:34 +0000 |
| commit | dd03762ab608e058c8f390ad9cf667e490089796 (patch) | |
| tree | b10773204ab7317c256802cf71632e3e535acdc6 /arch/arm64/Kconfig | |
| parent | d58071a8a76d779eedab38033ae4c821c30295a5 (diff) | |
| download | linux-dd03762ab608e058c8f390ad9cf667e490089796.tar.bz2 | |
arm64: Enable KCSAN
This patch enables KCSAN for arm64, with updates to build rules
to not use KCSAN for several incompatible compilation units.
Recent GCC version(at least GCC10) made outline-atomics as the
default option(unlike Clang), which will cause linker errors
for kernel/kcsan/core.o. Disables the out-of-line atomics by
no-outline-atomics to fix the linker errors.
Meanwhile, as Mark said[1], some latent issues are needed to be
fixed which isn't just a KCSAN problem, we make the KCSAN depends
on EXPERT for now.
Tested selftest and kcsan_test(built with GCC11 and Clang 13),
and all passed.
[1] https://lkml.kernel.org/r/YadiUPpJ0gADbiHQ@FVFF77S0Q05N
Acked-by: Marco Elver <elver@google.com> # kernel/kcsan
Tested-by: Joey Gouly <joey.gouly@arm.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Link: https://lore.kernel.org/r/20211211131734.126874-1-wangkefeng.wang@huawei.com
[catalin.marinas@arm.com: added comment to justify EXPERT]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index c4207cf9bb17..1d98e935c4d6 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -150,6 +150,8 @@ config ARM64 select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN select HAVE_ARCH_KASAN_SW_TAGS if HAVE_ARCH_KASAN select HAVE_ARCH_KASAN_HW_TAGS if (HAVE_ARCH_KASAN && ARM64_MTE) + # Some instrumentation may be unsound, hence EXPERT + select HAVE_ARCH_KCSAN if EXPERT select HAVE_ARCH_KFENCE select HAVE_ARCH_KGDB select HAVE_ARCH_MMAP_RND_BITS |