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SubjectRe: [PATCH -tip 1/2] Kconfig: Bump required compiler version of KASAN and UBSAN
On Tue, Jun 2, 2020 at 8:44 PM Marco Elver <elver@google.com> wrote:
>
> Adds config variable CC_HAS_WORKING_NOSANITIZE, which will be true if we
> have a compiler that does not fail builds due to no_sanitize functions.
> This does not yet mean they work as intended, but for automated
> build-tests, this is the minimum requirement.
>
> For example, we require that __always_inline functions used from
> no_sanitize functions do not generate instrumentation. On GCC <= 7 this
> fails to build entirely, therefore we make the minimum version GCC 8.

Could you also update KASAN docs to mention this requirement? As a
separate patch or in v2, up to you.

>
> For KCSAN this is a non-functional change, however, we should add it in
> case this variable changes in future.
>
> Link: https://lkml.kernel.org/r/20200602175859.GC2604@hirez.programming.kicks-ass.net
> Suggested-by: Peter Zijlstra <peterz@infradead.org>
> Signed-off-by: Marco Elver <elver@google.com>
> ---
> Apply after:
> https://lkml.kernel.org/r/20200602173103.931412766@infradead.org
> ---
> init/Kconfig | 3 +++
> lib/Kconfig.kasan | 1 +
> lib/Kconfig.kcsan | 1 +
> lib/Kconfig.ubsan | 1 +
> 4 files changed, 6 insertions(+)
>
> diff --git a/init/Kconfig b/init/Kconfig
> index 0f72eb4ffc87..3e8565bc8376 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -39,6 +39,9 @@ config TOOLS_SUPPORT_RELR
> config CC_HAS_ASM_INLINE
> def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
>
> +config CC_HAS_WORKING_NOSANITIZE
> + def_bool !CC_IS_GCC || GCC_VERSION >= 80000
> +
> config CONSTRUCTORS
> bool
> depends on !UML
> diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
> index 81f5464ea9e1..15e6c4b26a40 100644
> --- a/lib/Kconfig.kasan
> +++ b/lib/Kconfig.kasan
> @@ -20,6 +20,7 @@ config KASAN
> depends on (HAVE_ARCH_KASAN && CC_HAS_KASAN_GENERIC) || \
> (HAVE_ARCH_KASAN_SW_TAGS && CC_HAS_KASAN_SW_TAGS)
> depends on (SLUB && SYSFS) || (SLAB && !DEBUG_SLAB)
> + depends on CC_HAS_WORKING_NOSANITIZE
> help
> Enables KASAN (KernelAddressSANitizer) - runtime memory debugger,
> designed to find out-of-bounds accesses and use-after-free bugs.
> diff --git a/lib/Kconfig.kcsan b/lib/Kconfig.kcsan
> index 5ee88e5119c2..2ab4a7f511c9 100644
> --- a/lib/Kconfig.kcsan
> +++ b/lib/Kconfig.kcsan
> @@ -5,6 +5,7 @@ config HAVE_ARCH_KCSAN
>
> config HAVE_KCSAN_COMPILER
> def_bool CC_IS_CLANG && $(cc-option,-fsanitize=thread -mllvm -tsan-distinguish-volatile=1)
> + depends on CC_HAS_WORKING_NOSANITIZE
> help
> For the list of compilers that support KCSAN, please see
> <file:Documentation/dev-tools/kcsan.rst>.
> diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
> index a5ba2fd51823..f725d126af7d 100644
> --- a/lib/Kconfig.ubsan
> +++ b/lib/Kconfig.ubsan
> @@ -4,6 +4,7 @@ config ARCH_HAS_UBSAN_SANITIZE_ALL
>
> menuconfig UBSAN
> bool "Undefined behaviour sanity checker"
> + depends on CC_HAS_WORKING_NOSANITIZE
> help
> This option enables the Undefined Behaviour sanity checker.
> Compile-time instrumentation is used to detect various undefined
> --
> 2.27.0.rc2.251.g90737beb825-goog
>

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