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authorMarco Elver <elver@google.com>2021-11-30 14:44:33 +0300
committerPaul E. McKenney <paulmck@kernel.org>2021-12-10 03:42:28 +0300
commitbd3d5bd1a0ad386475ea7a3de8a91e7d8a600536 (patch)
tree0e66c5199f20a5757e3763a92be0158cccac35a2 /lib/Kconfig.kcsan
parenta015b7085979b12e55f67f3b86be0321fff6be3f (diff)
downloadlinux-bd3d5bd1a0ad386475ea7a3de8a91e7d8a600536.tar.xz
kcsan: Support WEAK_MEMORY with Clang where no objtool support exists
Clang and GCC behave a little differently when it comes to the __no_sanitize_thread attribute, which has valid reasons, and depending on context either one could be right. Traditionally, user space ThreadSanitizer [1] still expects instrumented builtin atomics (to avoid false positives) and __tsan_func_{entry,exit} (to generate meaningful stack traces), even if the function has the attribute no_sanitize("thread"). [1] https://clang.llvm.org/docs/ThreadSanitizer.html#attribute-no-sanitize-thread GCC doesn't follow the same policy (for better or worse), and removes all kinds of instrumentation if no_sanitize is added. Arguably, since this may be a problem for user space ThreadSanitizer, we expect this may change in future. Since KCSAN != ThreadSanitizer, the likelihood of false positives even without barrier instrumentation everywhere, is much lower by design. At least for Clang, however, to fully remove all sanitizer instrumentation, we must add the disable_sanitizer_instrumentation attribute, which is available since Clang 14.0. Signed-off-by: Marco Elver <elver@google.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'lib/Kconfig.kcsan')
-rw-r--r--lib/Kconfig.kcsan2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Kconfig.kcsan b/lib/Kconfig.kcsan
index e4394ea8068b..63b70b8c5551 100644
--- a/lib/Kconfig.kcsan
+++ b/lib/Kconfig.kcsan
@@ -198,7 +198,7 @@ config KCSAN_WEAK_MEMORY
# We can either let objtool nop __tsan_func_{entry,exit}() and builtin
# atomics instrumentation in .noinstr.text, or use a compiler that can
# implement __no_kcsan to really remove all instrumentation.
- depends on STACK_VALIDATION || CC_IS_GCC
+ depends on STACK_VALIDATION || CC_IS_GCC || CLANG_VERSION >= 140000
help
Enable support for modeling a subset of weak memory, which allows
detecting a subset of data races due to missing memory barriers.