[libc-commits] [libc] [libc] Make LlvmLibcStackChkFail.Smash test compatible with asan, hwasan (PR #125763)

[Roland McGrath via libc-commits]

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@@ -12,19 +12,30 @@
 #include "src/string/memset.h"
 #include "test/UnitTest/Test.h"
 
+namespace {
+
 TEST(LlvmLibcStackChkFail, Death) {
   EXPECT_DEATH([] { __stack_chk_fail(); }, WITH_SIGNAL(SIGABRT));
 }
 
-// Disable the test when asan is enabled so that it doesn't immediately fail
-// after the memset, but before the stack canary is re-checked.
-#ifndef LIBC_HAS_ADDRESS_SANITIZER
+// When https://github.com/llvm/llvm-project/issues/125760 is fixed,
+// this can use the `gnu::` spelling unconditionally.
+#ifdef __clang__
+#define SANITIZER_ATTR_NS clang
+#else
+#define SANITIZER_ATTR_NS gnu
+#endif
+
+// Disable sanitizers such as asan and hwasan that would catch the buffer
+// overrun before it clobbered the stack canary word.  Function attributes
+// can't be applied to lambdas before C++23, so this has to be separate.
+[[SANITIZER_ATTR_NS::no_sanitize("all")]] void smash_stack() {
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frobtech wrote:

Done.

https://github.com/llvm/llvm-project/pull/125763