executor: add test_syzos() for arm64

Make sure regressions in guest code validation are reported during testing
rather than fuzzing.

Author: ramosian-glider

executor/test.h

@@ -1,7 +1,7 @@
 // Copyright 2017 syzkaller project authors. All rights reserved.
 // Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
 
-#if GOOS_linux && (GOARCH_amd64 | GOARCH_ppc64 | GOARCH_ppc64le)
+#if GOOS_linux && (GOARCH_amd64 || GOARCH_ppc64 || GOARCH_ppc64le || GOARCH_arm64)
 #include "test_linux.h"
 #endif
 
@@ -372,8 +372,11 @@ static struct {
     {"test_copyin", test_copyin},
     {"test_csum_inet", test_csum_inet},
     {"test_csum_inet_acc", test_csum_inet_acc},
-#if GOOS_linux && (GOARCH_amd64 || GOARCH_ppc64 || GOARCH_ppc64le)
+#if GOOS_linux && (GOARCH_amd64 || GOARCH_ppc64 || GOARCH_ppc64le || GOARCH_arm64)
     {"test_kvm", test_kvm},
+#endif
+#if GOOS_linux && GOARCH_arm64
+    {"test_syzos", test_syzos},
 #endif
     {"test_cover_filter", test_cover_filter},
     {"test_glob", test_glob},

executor/test_linux.h

@@ -304,3 +304,19 @@ static int cpu_feature_enabled(uint32_t function, uint32_t eax_bits, uint32_t eb
 	return 0;
 }
 #endif
+
+#ifdef GOARCH_arm64
+static int test_syzos()
+{
+	int mem_size = SYZ_PAGE_SIZE * 4;
+	void* mem = mmap(0, mem_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+	if (mem == MAP_FAILED) {
+		printf("mmap failed (%d)\n", errno);
+		return 1;
+	}
+	// Right now SyzOS testing just boils down to installing code into memory.
+	install_syzos_code(mem, mem_size);
+	munmap(mem, mem_size);
+	return 0;
+}
+#endif