Messages in this thread Patch in this message | | | Date | Tue, 2 Jun 2020 20:44:08 +0200 | Subject | [PATCH -tip 1/2] Kconfig: Bump required compiler version of KASAN and UBSAN | From | Marco Elver <> |
| |
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.
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
| |