Android: Add simple test harness for Sandbox

tools/android/Makefile

@@ -0,0 +1,18 @@
+TARGET := libs/arm64-v8a/sandbox_test
+SRC := jni/sandbox_test.c
+
+all: $(TARGET)
+
+$(TARGET): $(SRC)
+	ndk-build
+
+push: $(TARGET)
+	adb push "$^" /data/local/tmp
+
+run: push
+	adb shell /data/local/tmp/sandbox_test
+
+clean:
+	rm -rf libs obj
+
+.PHONY: all push run

tools/android/jni/Android.mk

@@ -0,0 +1,8 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := sandbox_test
+LOCAL_SRC_FILES := sandbox_test.c
+LOCAL_C_INCLUDES := ../../
+
+include $(BUILD_EXECUTABLE)

tools/android/jni/Application.mk

@@ -0,0 +1,5 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+APP_ABI:= arm64-v8a
+APP_PLATFORM:=latest

tools/android/jni/sandbox_test.c

@@ -0,0 +1,43 @@
+#define GOOS_linux 1
+#define SYZ_SANDBOX_ANDROID_UNTRUSTED_APP 1
+#define SYZ_USE_TMP_DIR 1
+#define fail(...)   do { dprintf(2, __VA_ARGS__); dprintf(2, "\n"); perror("errno"); exit(1); } while(0)
+#define error(...)  do { dprintf(2, __VA_ARGS__); } while(0)
+#define debug(...)  do { dprintf(2, __VA_ARGS__); } while(0)
+
+#include <stdlib.h>
+#include <string.h>
+
+void doexit(int status)
+{
+    exit(status);
+}
+
+static void loop() {
+    exit(system("id"));
+}
+
+static void use_temporary_dir(void)
+{
+#if SYZ_SANDBOX_ANDROID_UNTRUSTED_APP
+    char tmpdir_template[] = "/data/data/syzkaller/syzkaller.XXXXXX";
+#else
+    char tmpdir_template[] = "./syzkaller.XXXXXX";
+#endif
+    char* tmpdir = mkdtemp(tmpdir_template);
+    if (!tmpdir)
+        fail("failed to mkdtemp");
+    if (chmod(tmpdir, 0777))
+        fail("failed to chmod");
+    if (chdir(tmpdir))
+        fail("failed to chdir");
+}
+
+
+
+#include "executor/common_linux.h"
+
+int main() {
+    use_temporary_dir();
+    do_sandbox_android_untrusted_app();
+}