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Subject[tip: x86/entry] kasan: Bump required compiler version
The following commit has been merged into the x86/entry branch of tip:

Commit-ID: 7b861a53e46b6b42ab8560b105af308cb72d7285
Gitweb: https://git.kernel.org/tip/7b861a53e46b6b42ab8560b105af308cb72d7285
Author: Marco Elver <elver@google.com>
AuthorDate: Thu, 04 Jun 2020 07:58:10 +02:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Mon, 15 Jun 2020 14:10:09 +02:00

kasan: Bump required compiler version

Adds config variable CC_HAS_WORKING_NOSANITIZE_ADDRESS, which will be
true if we have a compiler that does not fail builds due to
no_sanitize_address 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_address functions do not generate instrumentation. On GCC <=
7 this fails to build entirely, therefore we make the minimum version
GCC 8.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Andrey Konovalov <andreyknvl@google.com>
Link: https://lkml.kernel.org/r/20200602175859.GC2604@hirez.programming.kicks-ass.net
---
lib/Kconfig.kasan | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
index 81f5464..af0dd09 100644
--- a/lib/Kconfig.kasan
+++ b/lib/Kconfig.kasan
@@ -15,11 +15,15 @@ config CC_HAS_KASAN_GENERIC
config CC_HAS_KASAN_SW_TAGS
def_bool $(cc-option, -fsanitize=kernel-hwaddress)

+config CC_HAS_WORKING_NOSANITIZE_ADDRESS
+ def_bool !CC_IS_GCC || GCC_VERSION >= 80000
+
config KASAN
bool "KASAN: runtime memory debugger"
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_ADDRESS
help
Enables KASAN (KernelAddressSANitizer) - runtime memory debugger,
designed to find out-of-bounds accesses and use-after-free bugs.
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