From: Peter Zijlstra <peterz@infradead.org>
To: tglx@linutronix.de
Cc: x86@kernel.org, elver@google.com, paulmck@kernel.org,
kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org,
peterz@infradead.org, will@kernel.org, dvyukov@google.com,
glider@google.com, andreyknvl@google.com,
Nick Desaulniers <ndesaulniers@google.com>
Subject: [PATCH 4/8] kasan: Bump required compiler version
Date: Thu, 04 Jun 2020 12:22:45 +0200 [thread overview]
Message-ID: <20200604102428.135635542@infradead.org> (raw)
In-Reply-To: 20200604102241.466509982@infradead.org
From: Marco Elver <elver@google.com>
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
---
Apply after:
https://lkml.kernel.org/r/20200602173103.931412766@infradead.org
v2:
* No longer restrict UBSAN (and KCSAN), since the attributes behave
differently for different sanitizers. For UBSAN the above case with GCC
<= 7 actually works fine (no compiler error). So it seems that only
KASAN is affected by this -- let's limit our restriction to KASAN.
---
lib/Kconfig.kasan | 4 ++++
1 file changed, 4 insertions(+)
--- 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.
next prev parent reply other threads:[~2020-06-04 10:25 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-04 10:22 [PATCH 0/8] x86/entry: KCSAN/KASAN/UBSAN vs noinstr Peter Zijlstra
2020-06-04 10:22 ` [PATCH 1/8] x86, kcsan: Remove __no_kcsan_or_inline usage Peter Zijlstra
2020-06-04 10:22 ` [PATCH 2/8] kcsan: Remove __no_kcsan_or_inline Peter Zijlstra
2020-06-04 10:22 ` [PATCH 3/8] x86, kcsan: Add __no_kcsan to noinstr Peter Zijlstra
2020-06-04 10:22 ` Peter Zijlstra [this message]
2020-06-04 10:22 ` [PATCH 5/8] compiler_types.h: Add __no_sanitize_{address,undefined} " Peter Zijlstra
2020-06-04 10:22 ` [PATCH 6/8] x86/entry, cpumask: Provide non-instrumented variant of cpu_is_offline() Peter Zijlstra
2020-06-04 10:22 ` [PATCH 7/8] x86/entry, ubsan, objtool: Whitelist __ubsan_handle_*() Peter Zijlstra
2020-06-04 10:22 ` [PATCH 8/8] x86/entry, bug: Comment the instrumentation_begin() usage for WARN() Peter Zijlstra
2020-06-04 11:01 ` [PATCH 0/8] x86/entry: KCSAN/KASAN/UBSAN vs noinstr Marco Elver
2020-06-15 10:07 ` Marco Elver
2020-06-15 14:57 ` Qian Cai
2020-06-15 15:06 ` Peter Zijlstra
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