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[求助]android4.2.2的jni加载dex问题
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发表于:
2014-12-23 17:37
6641
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[求助]android4.2.2的jni加载dex问题
测试版本android4.2.2
inject.c 注入 libmyhook.so 成功，
libmyhook.so中的代码：
JavaVM* jvm = AndroidRuntime::getJavaVM();
LOGD("[+][+]JavaVM = AndroidRuntime::getJavaVM()\n");
jvm->AttachCurrentThread(&jni_env, NULL);
LOGD("[+][+]JavaVM = AttachCurrentThread()\n");
jstring apk_path = jni_env->NewStringUTF(
"/data/Entry.apk");
jstring dex_out_path = jni_env->NewStringUTF("/data/dexout");
jclass dexloader_claxx = jni_env->FindClass("dalvik/system/DexClassLoader");
jstring apk_lib_path = jni_env->NewStringUTF("/system/lib");
snprintf(sig_buffer, 512, "(%s%s%s%s)V", JSTRING, JSTRING, JSTRING,
JCLASS_LOADER);
jmethodID dexloader_init_method = jni_env->GetMethodID(dexloader_claxx,
"<init>", sig_buffer);
LOGD("[+][+]JavaVM = dexloader_init_method\n");
snprintf(sig_buffer, 512, "(%s)%s", JSTRING, JCLASS);
jmethodID loadClass_method = jni_env->GetMethodID(dexloader_claxx,
"loadClass", sig_buffer);
LOGD("[+][+]JavaVM = loadClass_method\n");
jobject class_loader = getSystemClassLoader();
check_value(class_loader);
if (class_loader == NULL) {
LOGD("[+][+]JavaVM = getSystemClassLoader NULL\n");
} else {
LOGD("[+][+]JavaVM = getSystemClassLoader\n");
}
jobject dex_loader_obj = jni_env->NewObject(dexloader_claxx,
dexloader_init_method, apk_path, dex_out_path, apk_lib_path,
class_loader);
if (dex_loader_obj == NULL) {
LOGD("[+][+]JavaVM = dex_loader_obj NULL\n");
} else {
LOGD("[+][+]JavaVM = dex_loader_obj\n");
}
jstring class_name = jni_env->NewStringUTF(
"com.example.inject.EntryClass");
jclass entry_class = static_cast<jclass>(jni_env->CallObjectMethod(
dex_loader_obj, loadClass_method, class_name));
if (entry_class == NULL) {
LOGD("[+][+]JavaVM = entry_class NULL\n");
} else {
LOGD("[+][+]JavaVM = entry_class\n");
}
测试结果错误在[+][+]JavaVM = entry_class NULL
目录权限dexout为777
Entry.apk权限为755
应该没错，我在Android4.0.3下测试成功的。
从错误上看应该是DexClassLoader类的loadClass方法有问题。查不出问题是什么。
希望熟悉的朋友帮个忙！给某解惑！谢谢！
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