--- /dev/null
+++ libmalloc/libmalloc-283/tests/asan.c
@@ -0,0 +1,78 @@
+#include <TargetConditionals.h>
+#include <darwintest.h>
+#include <dlfcn.h>
+#include <setjmp.h>
+#include <stdlib.h>
+#include "sanitizer/asan_interface.h"
+
+T_GLOBAL_META(T_META_RUN_CONCURRENTLY(true));
+
+T_DECL(asan_sanity, "ASan Sanity Check", T_META_CHECK_LEAKS(NO))
+{
+	const char *dylib_path =
+		TARGET_OS_OSX    ? "@rpath/libclang_rt.asan_osx_dynamic.dylib" :
+		TARGET_OS_IOS    ? "@rpath/libclang_rt.asan_ios_dynamic.dylib" :
+		TARGET_OS_TV     ? "@rpath/libclang_rt.asan_tvos_dynamic.dylib" :
+		TARGET_OS_WATCH  ? "@rpath/libclang_rt.asan_watchos_dynamic.dylib" :
+		TARGET_OS_BRIDGE ? "@rpath/libclang_rt.asan_bridgeos_dynamic.dylib" :
+		NULL;
+
+	void *asan_dylib = dlopen(dylib_path, RTLD_NOLOAD);
+	T_ASSERT_NOTNULL(asan_dylib, "ASan dylib loaded");
+
+	void *ptr = malloc(16);
+	free(ptr);
+	
+	T_PASS("I didn't crash!");
+}
+
+jmp_buf longjmp_env = {0};
+bool asan_report_hit = false;
+char *asan_report = NULL;
+
+void asan_report_handler(const char *report) {
+	asan_report_hit = true;
+	asan_report = strdup(report);
+	longjmp(longjmp_env, 1);
+}
+
+__attribute__((optnone, noinline))
+void write_byte(void *ptr, size_t offset) {
+	((char *)ptr)[offset] = 'x';
+}
+
+T_DECL(asan_use_after_free, "ASan Detects use-after-free", T_META_CHECK_LEAKS(NO))
+{
+	asan_report = NULL;
+	asan_report_hit = false;
+	__asan_set_error_report_callback(asan_report_handler);
+
+	if (setjmp(longjmp_env) == 0) {
+		char *ptr = malloc(16);
+		free(ptr);
+		write_byte(ptr, 10);
+
+		T_FAIL("use-after-free not detected");
+	}
+
+	T_EXPECT_EQ(asan_report_hit, true, "asan finds use-after-free");
+	T_EXPECT_NOTNULL(strstr(asan_report, "AddressSanitizer: heap-use-after-free"), "asan header");
+}
+
+T_DECL(asan_heap_buffer_overflow, "ASan Detects heap-buffer-overflow", T_META_CHECK_LEAKS(NO))
+{
+	asan_report = NULL;
+	asan_report_hit = false;
+	__asan_set_error_report_callback(asan_report_handler);
+
+	if (setjmp(longjmp_env) == 0) {
+		char *ptr = malloc(16);
+		write_byte(ptr, 17);
+		free(ptr);
+
+		T_FAIL("heap-buffer-overflow not detected");
+	}
+
+	T_EXPECT_EQ(asan_report_hit, true, "asan finds heap-buffer-overflow");
+	T_EXPECT_NOTNULL(strstr(asan_report, "AddressSanitizer: heap-buffer-overflow"), "asan header");
+}