forked from MarcoBuster/Magisk
142 lines
4.4 KiB
C++
142 lines
4.4 KiB
C++
#include <jni.h>
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#include <xhook.h>
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#include <utils.hpp>
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#include <flags.hpp>
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#include "inject.hpp"
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using namespace std;
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static JavaVM *g_jvm;
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// For some reason static vector won't work, use a pointer instead
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static vector<tuple<const char *, const char *, void **>> *hook_list;
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#define DEF_HOOK_FUNC(ret, func, ...) \
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static ret (*old_##func)(__VA_ARGS__); \
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static ret new_##func(__VA_ARGS__)
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#define HOOK_JNI(clazz, method) \
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if (newMethods[i].name == #method##sv) { \
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JNI::clazz::method##_orig = new JNINativeMethod(); \
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memcpy(JNI::clazz::method##_orig, &newMethods[i], sizeof(JNINativeMethod)); \
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for (int j = 0; j < JNI::clazz::method##_methods_num; ++j) { \
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if (strcmp(newMethods[i].signature, JNI::clazz::method##_methods[j].signature) == 0) { \
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newMethods[i] = JNI::clazz::method##_methods[j]; \
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LOGI("hook: replaced " #clazz "#" #method "\n"); \
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++hooked; \
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break; \
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} \
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} \
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continue; \
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}
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#define clone_methods() \
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newMethods = make_unique<JNINativeMethod[]>(numMethods); \
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memcpy(newMethods.get(), methods, sizeof(JNINativeMethod) * numMethods)
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DEF_HOOK_FUNC(int, jniRegisterNativeMethods,
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JNIEnv *env, const char *className, const JNINativeMethod *methods, int numMethods) {
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LOGD("hook: jniRegisterNativeMethods %s", className);
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unique_ptr<JNINativeMethod[]> newMethods;
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int hooked = 0;
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if (g_jvm == nullptr) {
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// Save for later unhooking
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env->GetJavaVM(&g_jvm);
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}
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if (className == "com/android/internal/os/Zygote"sv) {
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clone_methods();
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for (int i = 0; i < numMethods && hooked < 3; ++i) {
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HOOK_JNI(Zygote, nativeForkAndSpecialize);
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HOOK_JNI(Zygote, nativeSpecializeAppProcess);
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HOOK_JNI(Zygote, nativeForkSystemServer);
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}
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} else if (className == "android/os/SystemProperties"sv) {
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clone_methods();
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for (int i = 0; i < numMethods && hooked < 1; ++i) {
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HOOK_JNI(SystemProperties, native_set);
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}
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}
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return old_jniRegisterNativeMethods(env, className, newMethods.get() ?: methods, numMethods);
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}
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static bool hook_refresh() {
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if (xhook_refresh(0) == 0) {
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xhook_clear();
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LOGI("hook: xhook success\n");
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return true;
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} else {
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LOGE("hook: xhook failed\n");
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return false;
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}
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}
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static int hook_register(const char *path, const char *symbol, void *new_func, void **old_func) {
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int ret = xhook_register(path, symbol, new_func, old_func);
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if (ret != 0) {
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LOGE("hook: Failed to register hook \"%s\"\n", symbol);
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return ret;
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}
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hook_list->emplace_back(path, symbol, old_func);
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return 0;
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}
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#define XHOOK_REGISTER(PATH_REGEX, NAME) \
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hook_register(PATH_REGEX, #NAME, (void*) new_##NAME, (void **) &old_##NAME)
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void hook_functions() {
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#ifdef MAGISK_DEBUG
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xhook_enable_debug(1);
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xhook_enable_sigsegv_protection(0);
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#endif
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hook_list = new remove_pointer_t<decltype(hook_list)>();
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XHOOK_REGISTER(".*\\libandroid_runtime.so$", jniRegisterNativeMethods);
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hook_refresh();
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}
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#define push_method(clazz, method) \
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if (JNI::clazz::method##_orig) methods.emplace_back(*JNI::clazz::method##_orig)
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bool unhook_functions() {
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JNIEnv* env;
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if (g_jvm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK)
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return false;
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vector<JNINativeMethod> methods;
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push_method(Zygote, nativeForkAndSpecialize);
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push_method(Zygote, nativeSpecializeAppProcess);
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push_method(Zygote, nativeForkSystemServer);
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if (!methods.empty() && old_jniRegisterNativeMethods(env,
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"com/android/internal/os/Zygote",
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methods.data(), methods.size()) != 0) {
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LOGE("hook: Failed to register JNI hook for Zygote\n");
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return false;
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}
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methods.clear();
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push_method(SystemProperties, native_set);
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if (!methods.empty() && old_jniRegisterNativeMethods(env,
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"android/os/SystemProperties",
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methods.data(), methods.size()) != 0) {
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LOGE("hook: Failed to register JNI hook for SystemProperties\n");
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return false;
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}
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for (auto &[path, sym, old_func] : *hook_list) {
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if (xhook_register(path, sym, *old_func, nullptr) != 0) {
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LOGE("hook: Failed to register hook \"%s\"\n", sym);
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return false;
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}
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}
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delete hook_list;
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return hook_refresh();
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}
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