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LoveSy 2024-07-15 17:17:49 +08:00 committed by John Wu
parent 53a8ba8cfe
commit de7e5bdfe7
1 changed files with 8 additions and 16 deletions
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24
native/src/core/zygisk/hook.cpp
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@ -52,14 +52,8 @@ using namespace std;
// │ └───────────────────────┘ // │ └───────────────────────┘
// ▼ // ▼
// ┌──────────────────────────┐ // ┌──────────────────────────┐
// │androidSetCreateThreadFunc│ // │ strdup("ZygiskInit") │
// └─────────────┬────┬───────┘ // └─────────────┬────┬───────┘
// │ │ ┌────────────┐
// │ └────────────────►│hook_jni_env│
// ▼ └────────────┘
// ┌──────────────────┐
// │register_jni_procs│
// └────────┬────┬────┘
// │ │ ┌───────────────────┐ // │ │ ┌───────────────────┐
// │ └─────────────►│replace_jni_methods│ // │ └─────────────►│replace_jni_methods│
// │ └───────────────────┘ ┌─────────┐ // │ └───────────────────┘ ┌─────────┐
@ -85,13 +79,11 @@ using namespace std;
// * NativeBridgeItf: this symbol is the entry point for android::LoadNativeBridge // * NativeBridgeItf: this symbol is the entry point for android::LoadNativeBridge
// * HookContext::hook_plt(): hook functions like |dlclose| and |androidSetCreateThreadFunc| // * HookContext::hook_plt(): hook functions like |dlclose| and |androidSetCreateThreadFunc|
// * dlclose: the final step before android::LoadNativeBridge returns // * dlclose: the final step before android::LoadNativeBridge returns
// * androidSetCreateThreadFunc: called in AndroidRuntime::startReg before // * strdup: called in AndroidRuntime::start before calling specializations routines
// |register_jni_procs|, which is when most native JNI methods are registered.
// * HookContext::hook_jni_env(): replace the |RegisterNatives| function pointer in JNIEnv. // * HookContext::hook_jni_env(): replace the |RegisterNatives| function pointer in JNIEnv.
// * replace_jni_methods: called in the replaced |RegisterNatives| function to filter and replace // * replace_jni_methods: replace the function pointers registered in register_jni_procs,
// the function pointers registered in register_jni_procs, most importantly the process // most importantly the process specialization routines, which are our main targets.
// specialization routines, which are our main targets. This marks the final step // This marks the final step of the code injection bootstrap process.
// of the code injection bootstrap process.
// * pthread_attr_destroy: called whenever the JVM tries to setup threads for itself. We use // * pthread_attr_destroy: called whenever the JVM tries to setup threads for itself. We use
// this method to cleanup and unload Zygisk from the process. // this method to cleanup and unload Zygisk from the process.
@ -102,7 +94,7 @@ struct HookContext {
void hook_plt(); void hook_plt();
void hook_unloader(); void hook_unloader();
void restore_plt_hook(); void restore_plt_hook();
void hook_jni_env(); void replace_jni_methods();
void restore_jni_hook(JNIEnv *env); void restore_jni_hook(JNIEnv *env);
void post_native_bridge_load(); void post_native_bridge_load();
@ -135,7 +127,7 @@ ret new_##func(__VA_ARGS__)
DCL_HOOK_FUNC(char *, strdup, const char * str) { DCL_HOOK_FUNC(char *, strdup, const char * str) {
if (strcmp(kZygiskInit, str) == 0) { if (strcmp(kZygiskInit, str) == 0) {
g_hook->hook_jni_env(); g_hook->replace_jni_methods();
} }
return old_strdup(str); return old_strdup(str);
} }
@ -452,7 +444,7 @@ void HookContext::restore_plt_hook() {
hookJniNativeMethods(env, kZygote, method##_methods.data(), method##_methods.size()); \ hookJniNativeMethods(env, kZygote, method##_methods.data(), method##_methods.size()); \
for (auto m: method##_methods) if (m.fnPtr) { method##_orig = m.fnPtr; break; } for (auto m: method##_methods) if (m.fnPtr) { method##_orig = m.fnPtr; break; }
void HookContext::hook_jni_env() { void HookContext::replace_jni_methods() {
using method_sig = jint(*)(JavaVM **, jsize, jsize *); using method_sig = jint(*)(JavaVM **, jsize, jsize *);
auto get_created_vms = reinterpret_cast<method_sig>( auto get_created_vms = reinterpret_cast<method_sig>(
dlsym(RTLD_DEFAULT, "JNI_GetCreatedJavaVMs")); dlsym(RTLD_DEFAULT, "JNI_GetCreatedJavaVMs"));