--- /dev/null
+++ libmalloc/libmalloc-792.80.2/tests/guarded_range_test_tool.c
@@ -0,0 +1,30 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <malloc/malloc.h>
+
+extern malloc_zone_t **malloc_zones;
+
+uint8_t data[256];
+
+int main(int argc, const char *argv[])
+{
+	const char *pgm = getenv("MallocProbGuard");
+	const char *bypass_pgm_check = getenv("GuardedRangeTestBypassPGMCheck");
+	uintptr_t addr;
+
+	assert(argc == 2);
+	assert(pgm || bypass_pgm_check);
+	if (strcmp(argv[1], "zone") == 0) {
+		addr = (uintptr_t)malloc_zones[0];
+	} else if (strcmp(argv[1], "array") == 0) {
+		addr = (uintptr_t)malloc_zones;
+	} else {
+		assert(false && "Argument 1 should be either 'zone' or 'array'");
+	}
+
+	printf("0x%lx\n", (uintptr_t)data - addr);
+	return 0;
+}