Generalize gen_jni_hooks.py

build.gradle.kts

@@ -16,7 +16,7 @@ buildscript {
     extra["vNav"] = vNav
 
     dependencies {
-        classpath("com.android.tools.build:gradle:7.0.0")
+        classpath("com.android.tools.build:gradle:7.0.1")
         classpath(kotlin("gradle-plugin", version = "1.5.21"))
         classpath("androidx.navigation:navigation-safe-args-gradle-plugin:${vNav}")
 

native/jni/zygisk/gen_jni_hooks.py

@@ -3,44 +3,73 @@
 primitives = ['jint', 'jboolean', 'jlong']
 
 class JType:
-    def __init__(self, name, sig) -> None:
+    def __init__(self, cpp, jni):
-        self.name = name
+        self.cpp = cpp
-        self.sig = sig
+        self.jni = jni
 
 
 class JArray(JType):
-    def __init__(self, type) -> None:
+    def __init__(self, type):
-        if type.name in primitives:
+        if type.cpp in primitives:
-            name = type.name + 'Array'
+            name = type.cpp + 'Array'
         else:
             name = 'jobjectArray'
-        super().__init__(name, '[' + type.sig)
+        super().__init__(name, '[' + type.jni)
 
 
 class Argument:
-    def __init__(self, name, type, set_arg = False) -> None:
+    def __init__(self, name, type, set_arg = False):
         self.name = name
         self.type = type
         self.set_arg = set_arg
 
     def cpp(self):
-        return f'{self.type.name} {self.name}'
+        return f'{self.type.cpp} {self.name}'
 
+# Args we don't care, give it an auto generated name
+class Anon(Argument):
+    cnt = 0
+    def __init__(self, type):
+        super().__init__(f'_{Anon.cnt}', type)
+        Anon.cnt += 1
+
+class Return:
+    def __init__(self, value, type):
+        self.value = value
+        self.type = type
 
 class Method:
-    def __init__(self, name, args) -> None:
+    def __init__(self, name, ret, args):
         self.name = name
+        self.ret = ret
         self.args = args
 
     def cpp(self):
-        return ', '.join(map(lambda a: a.cpp(), self.args))
+        return ', '.join(map(lambda x: x.cpp(), self.args))
 
     def name_list(self):
-        return ', '.join(map(lambda a: a.name, self.args))
+        return ', '.join(map(lambda x: x.name, self.args))
 
     def jni(self):
-        return ''.join(map(lambda a: a.type.sig, self.args))
+        args = ''.join(map(lambda x: x.type.jni, self.args))
+        return f'({args}){self.ret.type.jni}'
 
+    def body(self):
+        return ''
+
+class JNIHook(Method):
+    def __init__(self, ver, ret, args):
+        name = f'{self.base_name()}_{ver}'
+        super().__init__(name, ret, args)
+
+    def base_name(self):
+        return ''
+
+    def orig_method(self):
+        return f'reinterpret_cast<decltype(&{self.name})>({self.base_name()}_orig)'
+
+def ind(i):
+    return '\n' + '    ' * i
 
 # Common types
 jint = JType('jint', 'I')
@@ -48,6 +77,48 @@ jintArray = JArray(jint)
 jstring = JType('jstring', 'Ljava/lang/String;')
 jboolean = JType('jboolean', 'Z')
 jlong = JType('jlong', 'J')
+void = JType('void', 'V')
+
+class ForkAndSpec(JNIHook):
+    def __init__(self, ver, args):
+        super().__init__(ver, Return('ctx.pid', jint), args)
+
+    def base_name(self):
+        return 'nativeForkAndSpecialize'
+
+    def init_args(self):
+        return 'SpecializeAppProcessArgs args(uid, gid, gids, runtime_flags, mount_external, se_info, nice_name, instruction_set, app_data_dir);'
+
+    def body(self):
+        decl = ''
+        decl += ind(1) + self.init_args()
+        for a in self.args:
+            if a.set_arg:
+                decl += ind(1) + f'args.{a.name} = &{a.name};'
+        decl += ind(1) + 'HookContext ctx;'
+        decl += ind(1) + 'ctx.env = env;'
+        decl += ind(1) + 'ctx.raw_args = &args;'
+        decl += ind(1) + f'ctx.{self.base_name()}_pre();'
+        decl += ind(1) + self.orig_method() + '('
+        decl += ind(2) + f'env, clazz, {self.name_list()}'
+        decl += ind(1) + ');'
+        decl += ind(1) + f'ctx.{self.base_name()}_post();'
+        return decl
+
+class SpecApp(ForkAndSpec):
+    def __init__(self, ver, args):
+        super().__init__(ver, args)
+        self.ret = Return('', void)
+
+    def base_name(self):
+        return 'nativeSpecializeAppProcess'
+
+class ForkServer(ForkAndSpec):
+    def base_name(self):
+        return 'nativeForkSystemServer'
+
+    def init_args(self):
+        return 'ForkSystemServerArgs args(uid, gid, gids, runtime_flags, permitted_capabilities, effective_capabilities);'
 
 # Common args
 uid = Argument('uid', jint)
@@ -77,125 +148,143 @@ whitelisted_data_info_list = Argument('whitelisted_data_info_list', JArray(jstri
 mount_data_dirs = Argument('mount_data_dirs', jboolean, True)
 mount_storage_dirs = Argument('mount_storage_dirs', jboolean, True)
 
-# samsung (non-standard arguments)
-i1 = Argument('i1', jint)
-i2 = Argument('i2', jint)
-i3 = Argument('i3', jint)
-
 # server
 permitted_capabilities = Argument('permitted_capabilities', jlong)
 effective_capabilities = Argument('effective_capabilities', jlong)
 
 # Method definitions
-fork_l = Method('l', [uid, gid, gids, runtime_flags, rlimits, mount_external,
+fas_l = ForkAndSpec('l', [uid, gid, gids, runtime_flags, rlimits, mount_external,
     se_info, nice_name, fds_to_close, instruction_set, app_data_dir])
 
-fork_o = Method('o', [uid, gid, gids, runtime_flags, rlimits, mount_external,
+fas_o = ForkAndSpec('o', [uid, gid, gids, runtime_flags, rlimits, mount_external,
     se_info, nice_name, fds_to_close, fds_to_ignore, instruction_set, app_data_dir])
 
-fork_p = Method('p', [uid, gid, gids, runtime_flags, rlimits, mount_external, se_info,
+fas_p = ForkAndSpec('p', [uid, gid, gids, runtime_flags, rlimits, mount_external, se_info,
     nice_name, fds_to_close, fds_to_ignore, is_child_zygote, instruction_set, app_data_dir])
 
-fork_q_alt = Method('q_alt', [uid, gid, gids, runtime_flags, rlimits, mount_external, se_info,
+fas_q_alt = ForkAndSpec('q_alt', [uid, gid, gids, runtime_flags, rlimits, mount_external, se_info,
     nice_name, fds_to_close, fds_to_ignore, is_child_zygote, instruction_set, app_data_dir, is_top_app])
 
-fork_r = Method('r', [uid, gid, gids, runtime_flags, rlimits, mount_external, se_info,
+fas_r = ForkAndSpec('r', [uid, gid, gids, runtime_flags, rlimits, mount_external, se_info,
     nice_name, fds_to_close, fds_to_ignore, is_child_zygote, instruction_set, app_data_dir, is_top_app,
     pkg_data_info_list, whitelisted_data_info_list, mount_data_dirs, mount_storage_dirs])
 
-fork_samsung_m = Method('samsung_m', [uid, gid, gids, runtime_flags, rlimits, mount_external,
+fas_samsung_m = ForkAndSpec('samsung_m', [uid, gid, gids, runtime_flags, rlimits, mount_external,
-    se_info, i1, i2, nice_name, fds_to_close, instruction_set, app_data_dir])
+    se_info, Anon(jint), Anon(jint), nice_name, fds_to_close, instruction_set, app_data_dir])
 
-fork_samsung_n = Method('samsung_n', [uid, gid, gids, runtime_flags, rlimits, mount_external,
+fas_samsung_n = ForkAndSpec('samsung_n', [uid, gid, gids, runtime_flags, rlimits, mount_external,
-    se_info, i1, i2, nice_name, fds_to_close, instruction_set, app_data_dir, i3])
+    se_info, Anon(jint), Anon(jint), nice_name, fds_to_close, instruction_set, app_data_dir, Anon(jint)])
 
-fork_samsung_o = Method('samsung_o', [uid, gid, gids, runtime_flags, rlimits, mount_external,
+fas_samsung_o = ForkAndSpec('samsung_o', [uid, gid, gids, runtime_flags, rlimits, mount_external,
-    se_info, i1, i2, nice_name, fds_to_close, fds_to_ignore, instruction_set, app_data_dir])
+    se_info, Anon(jint), Anon(jint), nice_name, fds_to_close, fds_to_ignore, instruction_set, app_data_dir])
 
-fork_samsung_p = Method('samsung_p', [uid, gid, gids, runtime_flags, rlimits, mount_external,
+fas_samsung_p = ForkAndSpec('samsung_p', [uid, gid, gids, runtime_flags, rlimits, mount_external,
-    se_info, i1, i2, nice_name, fds_to_close, fds_to_ignore, is_child_zygote, instruction_set, app_data_dir])
+    se_info, Anon(jint), Anon(jint), nice_name, fds_to_close, fds_to_ignore, is_child_zygote,
+    instruction_set, app_data_dir])
 
-spec_q = Method('q', [uid, gid, gids, runtime_flags, rlimits, mount_external, se_info,
+spec_q = SpecApp('q', [uid, gid, gids, runtime_flags, rlimits, mount_external, se_info,
     nice_name, is_child_zygote, instruction_set, app_data_dir])
 
-spec_q_alt = Method('q_alt', [uid, gid, gids, runtime_flags, rlimits, mount_external, se_info,
+spec_q_alt = SpecApp('q_alt', [uid, gid, gids, runtime_flags, rlimits, mount_external, se_info,
     nice_name, is_child_zygote, instruction_set, app_data_dir, is_top_app])
 
-spec_r = Method('r', [uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, nice_name,
+spec_r = SpecApp('r', [uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, nice_name,
     is_child_zygote, instruction_set, app_data_dir, is_top_app, pkg_data_info_list,
     whitelisted_data_info_list, mount_data_dirs, mount_storage_dirs])
 
-spec_samsung_q = Method('samsung_q', [uid, gid, gids, runtime_flags, rlimits, mount_external,
+spec_samsung_q = SpecApp('samsung_q', [uid, gid, gids, runtime_flags, rlimits, mount_external,
-    se_info, i1, i2, nice_name, is_child_zygote, instruction_set, app_data_dir])
+    se_info, Anon(jint), Anon(jint), nice_name, is_child_zygote, instruction_set, app_data_dir])
 
-server_l = Method('l', [uid, gid, gids, runtime_flags, rlimits,
+server_l = ForkServer('l', [uid, gid, gids, runtime_flags, rlimits,
     permitted_capabilities, effective_capabilities])
 
-server_samsung_q = Method('samsung_q', [uid, gid, gids, runtime_flags, i1, i2, rlimits,
+server_samsung_q = ForkServer('samsung_q', [uid, gid, gids, runtime_flags, Anon(jint), Anon(jint), rlimits,
     permitted_capabilities, effective_capabilities])
 
+hook_map = {}
 
-def ind(i):
+def gen_jni_def(clz, methods):
-    return '\n' + '    ' * i
+    if clz not in hook_map:
+        hook_map[clz] = []
 
-def gen_definitions(methods, base_name):
     decl = ''
-    if base_name != 'nativeSpecializeAppProcess':
-        ret_stat = ind(1) + 'return ctx.pid;'
-        cpp_ret = 'jint'
-        jni_ret = 'I'
-    else:
-        ret_stat = ''
-        cpp_ret = 'void'
-        jni_ret = 'V'
     for m in methods:
-        func_name = f'{base_name}_{m.name}'
+        decl += ind(0) + f'{m.ret.type.cpp} {m.name}(JNIEnv *env, jclass clazz, {m.cpp()}) {{'
-        decl += ind(0) + f'{cpp_ret} {func_name}(JNIEnv *env, jclass clazz, {m.cpp()}) {{'
+        decl += m.body()
-        if base_name == 'nativeForkSystemServer':
+        if m.ret.value:
-            decl += ind(1) + 'ForkSystemServerArgs args(uid, gid, gids, runtime_flags, permitted_capabilities, effective_capabilities);'
+            decl += ind(1) + f'return {m.ret.value};'
-        else:
-            decl += ind(1) + 'SpecializeAppProcessArgs args(uid, gid, gids, runtime_flags, mount_external, se_info, nice_name, instruction_set, app_data_dir);'
-        for a in m.args:
-            if a.set_arg:
-                decl += ind(1) + f'args.{a.name} = &{a.name};'
-        decl += ind(1) + 'HookContext ctx;'
-        decl += ind(1) + 'ctx.env = env;'
-        decl += ind(1) + 'ctx.clazz = clazz;'
-        decl += ind(1) + 'ctx.raw_args = &args;'
-        decl += ind(1) + f'ctx.{base_name}_pre();'
-        decl += ind(1) + f'reinterpret_cast<decltype(&{func_name})>(HookContext::{base_name}_orig)('
-        decl += ind(2) + f'env, clazz, {m.name_list()}'
-        decl += ind(1) + ');'
-        decl += ind(1) + f'ctx.{base_name}_post();'
-        decl += ret_stat
         decl += ind(0) + '}'
 
-    decl += ind(0) + f'const JNINativeMethod {base_name}_methods[] = {{'
+    decl += ind(0) + f'const JNINativeMethod {m.base_name()}_methods[] = {{'
     for m in methods:
         decl += ind(1) + '{'
-        decl += ind(2) + f'"{base_name}",'
+        decl += ind(2) + f'"{m.base_name()}",'
-        decl += ind(2) + f'"({m.jni()}){jni_ret}",'
+        decl += ind(2) + f'"{m.jni()}",'
-        decl += ind(2) + f'(void *) &{base_name}_{m.name}'
+        decl += ind(2) + f'(void *) &{m.name}'
         decl += ind(1) + '},'
     decl += ind(0) + '};'
-    decl += ind(0) + f'constexpr int {base_name}_methods_num = std::size({base_name}_methods);'
+    decl = ind(0) + f'void *{m.base_name()}_orig = nullptr;' + decl
+    decl += ind(0) + f'constexpr int {m.base_name()}_methods_num = std::size({m.base_name()}_methods);'
     decl += ind(0)
+
+    hook_map[clz].append(m.base_name())
+
     return decl
 
-def gen_fork():
+def gen_jni_hook():
-    methods = [fork_l, fork_o, fork_p, fork_q_alt, fork_r, fork_samsung_m, fork_samsung_n, fork_samsung_o, fork_samsung_p]
+    decl = ''
-    return gen_definitions(methods, 'nativeForkAndSpecialize')
+    decl += ind(0) + 'unique_ptr<JNINativeMethod[]> hookAndSaveJNIMethods(const char *className, const JNINativeMethod *methods, int numMethods) {'
+    decl += ind(1) + 'unique_ptr<JNINativeMethod[]> newMethods;'
+    decl += ind(1) + 'int clz_id = -1;'
+    decl += ind(1) + 'int hook_cnt = 0;'
+    decl += ind(1) + 'do {'
 
-def gen_spec():
+    for index, (clz, methods) in enumerate(hook_map.items()):
-    methods = [spec_q, spec_q_alt, spec_r, spec_samsung_q]
+        decl += ind(2) + f'if (className == "{clz}"sv) {{'
-    return gen_definitions(methods, 'nativeSpecializeAppProcess')
+        decl += ind(3) + f'clz_id = {index};'
+        decl += ind(3) + f'hook_cnt = {len(methods)};'
+        decl += ind(3) + 'break;'
+        decl += ind(2) + '}'
 
-def gen_server():
+    decl += ind(1) + '} while (false);'
-    methods = [server_l, server_samsung_q]
+
-    return gen_definitions(methods, 'nativeForkSystemServer')
+    decl += ind(1) + 'if (hook_cnt) {'
+    decl += ind(2) + 'newMethods = make_unique<JNINativeMethod[]>(numMethods);'
+    decl += ind(2) + 'memcpy(newMethods.get(), methods, sizeof(JNINativeMethod) * numMethods);'
+    decl += ind(1) + '}'
+
+    decl += ind(1) + 'auto &class_map = (*jni_method_map)[className];'
+    decl += ind(1) + 'for (int i = 0; i < numMethods; ++i) {'
+    decl += ind(2) + 'class_map[methods[i].name][methods[i].signature] = methods[i].fnPtr;'
+    decl += ind(2) + 'if (hook_cnt == 0) continue;'
+
+    for index, methods in enumerate(hook_map.values()):
+        decl += ind(2) + f'if (clz_id == {index}) {{'
+        for m in methods:
+            decl += ind(3) + f'HOOK_JNI({m})'
+        decl += ind(3) + 'continue;'
+        decl += ind(2) + '}'
+
+    decl += ind(1) + '}'
+
+    decl += ind(1) + 'return newMethods;'
+    decl += ind(0) + '}'
+    return decl
 
 with open('jni_hooks.hpp', 'w') as f:
     f.write('// Generated by gen_jni_hooks.py\n')
-    f.write(gen_fork())
+
-    f.write(gen_spec())
+    zygote = 'com/android/internal/os/Zygote'
-    f.write(gen_server())
+
+    methods = [fas_l, fas_o, fas_p, fas_q_alt, fas_r, fas_samsung_m, fas_samsung_n, fas_samsung_o, fas_samsung_p]
+    f.write(gen_jni_def(zygote, methods))
+
+    methods = [spec_q, spec_q_alt, spec_r, spec_samsung_q]
+    f.write(gen_jni_def(zygote, methods))
+
+    methods = [server_l, server_samsung_q]
+    f.write(gen_jni_def(zygote, methods))
+
+    f.write(gen_jni_hook())
+
+    f.write('\n')

native/jni/zygisk/hook.cpp

@@ -15,25 +15,24 @@ using jni_hook::hash_map;
 using jni_hook::tree_map;
 using xstring = jni_hook::string;
 
+// Extreme verbose logging
+#define VLOG(...) LOGD(__VA_ARGS__)
+//#define VLOG(...)
+
 namespace {
 
-#define DCL_JNI_FUNC(name) \
-static void *name##_orig;  \
-void name##_pre();         \
-void name##_post();
-
-#define DEF_STATIC(name) \
-void *HookContext::name##_orig = nullptr;
-
 enum {
     DENY_FLAG,
-    APP_FORK,
+    FORK_AND_SPECIALIZE,
     FLAG_MAX
 };
 
+#define DCL_JNI_FUNC(name) \
+void name##_pre();         \
+void name##_post();
+
 struct HookContext {
     JNIEnv *env;
-    jclass clazz;
     union {
         SpecializeAppProcessArgs *args;
         ForkSystemServerArgs *server_args;
@@ -43,23 +42,26 @@ struct HookContext {
     int pid;
     bitset<FLAG_MAX> flags;
 
-    HookContext() : process(nullptr), pid(0) {}
+    HookContext() : pid(-1) {}
+
+    void pre_fork();
+    static void post_fork();
 
-    // JNI method declarations
     DCL_JNI_FUNC(nativeForkAndSpecialize)
     DCL_JNI_FUNC(nativeSpecializeAppProcess)
     DCL_JNI_FUNC(nativeForkSystemServer)
 };
-DEF_STATIC(nativeForkAndSpecialize)
-DEF_STATIC(nativeSpecializeAppProcess)
-DEF_STATIC(nativeForkSystemServer)
 
 #undef DCL_JNI_FUNC
-#undef DEF_STATIC
+
+struct StringCmp {
+    using is_transparent = void;
+    bool operator()(string_view a, string_view b) const { return a < b; }
+};
 
 // Global variables
 vector<tuple<const char *, const char *, void **>> *xhook_list;
-vector<JNINativeMethod> *jni_hook_list;
+map<string, vector<JNINativeMethod>, StringCmp> *jni_hook_list;
 hash_map<xstring, tree_map<xstring, tree_map<xstring, void *>>> *jni_method_map;
 
 // Current context
@@ -67,46 +69,23 @@ HookContext *g_ctx;
 const JNINativeInterface *old_functions;
 JNINativeInterface *new_functions;
 
-// JNI method definitions
-// Includes method signatures of all supported Android versions
-#include "jni_hooks.hpp"
-
 #define HOOK_JNI(method) \
 if (methods[i].name == #method##sv) { \
-    jni_hook_list->push_back(methods[i]);              \
-    HookContext::method##_orig = methods[i].fnPtr;     \
     for (int j = 0; j < method##_methods_num; ++j) { \
         if (strcmp(methods[i].signature, method##_methods[j].signature) == 0) { \
+            jni_hook_list->try_emplace(className).first->second.push_back(methods[i]); \
+            method##_orig = methods[i].fnPtr;        \
             newMethods[i] = method##_methods[j];     \
-            LOGI("zygisk: replaced #" #method "\n");   \
+            LOGI("zygisk: replaced %s#" #method "\n", className);               \
-            ++hooked;    \
+            --hook_cnt;  \
             break;       \
         }                \
     }                    \
     continue;            \
 }
 
-unique_ptr<JNINativeMethod[]>hookAndSaveJNIMethods(
+// JNI method hook definitions, auto generated
-        const char *className, const JNINativeMethod *methods, int numMethods) {
+#include "jni_hooks.hpp"
-    unique_ptr<JNINativeMethod[]> newMethods;
-    int hooked = numeric_limits<int>::max();
-    if (className == "com/android/internal/os/Zygote"sv) {
-        hooked = 0;
-        newMethods = make_unique<JNINativeMethod[]>(numMethods);
-        memcpy(newMethods.get(), methods, sizeof(JNINativeMethod) * numMethods);
-    }
-
-    auto &class_map = (*jni_method_map)[className];
-    for (int i = 0; i < numMethods; ++i) {
-        class_map[methods[i].name][methods[i].signature] = methods[i].fnPtr;
-        if (hooked < 3) {
-            HOOK_JNI(nativeForkAndSpecialize)
-            HOOK_JNI(nativeSpecializeAppProcess)
-            HOOK_JNI(nativeForkSystemServer)
-        }
-    }
-    return newMethods;
-}
 
 #undef HOOK_JNI
 
@@ -133,29 +112,29 @@ string get_class_name(JNIEnv *env, jclass clazz) {
 ret (*old_##func)(__VA_ARGS__);       \
 ret new_##func(__VA_ARGS__)
 
-jint jniRegisterNatives(
+jint env_RegisterNatives(
         JNIEnv *env, jclass clazz, const JNINativeMethod *methods, jint numMethods) {
     auto className = get_class_name(env, clazz);
-    LOGD("zygisk: JNIEnv->RegisterNatives [%s]\n", className.data());
+    VLOG("zygisk: JNIEnv->RegisterNatives [%s]\n", className.data());
     auto newMethods = hookAndSaveJNIMethods(className.data(), methods, numMethods);
     return old_functions->RegisterNatives(env, clazz, newMethods.get() ?: methods, numMethods);
 }
 
 DCL_HOOK_FUNC(int, jniRegisterNativeMethods,
         JNIEnv *env, const char *className, const JNINativeMethod *methods, int numMethods) {
-    LOGD("zygisk: jniRegisterNativeMethods [%s]\n", className);
+    VLOG("zygisk: jniRegisterNativeMethods [%s]\n", className);
     auto newMethods = hookAndSaveJNIMethods(className, methods, numMethods);
     return old_jniRegisterNativeMethods(env, className, newMethods.get() ?: methods, numMethods);
 }
 
 DCL_HOOK_FUNC(int, fork) {
-    return g_ctx ? g_ctx->pid : old_fork();
+    return (g_ctx && g_ctx->pid >= 0) ? g_ctx->pid : old_fork();
 }
 
 DCL_HOOK_FUNC(int, selinux_android_setcontext,
         uid_t uid, int isSystemServer, const char *seinfo, const char *pkgname) {
     if (g_ctx && g_ctx->flags[DENY_FLAG]) {
-        // Ask magiskd to cleanup our mount namespace before switching context
+        // Request magiskd to cleanup our mount namespace before switching secontext
         // This is the latest point where we can still connect to the magiskd main socket
         if (remote_request_unmount() == 0) {
             LOGD("zygisk: mount namespace cleaned up\n");
@@ -180,7 +159,7 @@ void onVmCreated(void *self, JNIEnv* env) {
 
     new_functions = new JNINativeInterface();
     memcpy(new_functions, env->functions, sizeof(*new_functions));
-    new_functions->RegisterNatives = &jniRegisterNatives;
+    new_functions->RegisterNatives = &env_RegisterNatives;
 
     // Replace the function table in JNIEnv to hook RegisterNatives
     old_functions = env->functions;
@@ -189,7 +168,7 @@ void onVmCreated(void *self, JNIEnv* env) {
 
 template<int N>
 void vtable_entry(void *self, JNIEnv* env) {
-    // The first invocation will be onVmCreated
+    // The first invocation will be onVmCreated. It will also restore the vtable.
     onVmCreated(self, env);
     // Call original function
     reinterpret_cast<decltype(&onVmCreated)>(gAppRuntimeVTable[N])(self, env);
@@ -232,10 +211,10 @@ DCL_HOOK_FUNC(void, setArgv0, void *self, const char *argv0, bool setProcName) {
 void HookContext::nativeSpecializeAppProcess_pre() {
     g_ctx = this;
     process = env->GetStringUTFChars(args->nice_name, nullptr);
-    if (flags[APP_FORK]) {
+    if (flags[FORK_AND_SPECIALIZE]) {
-        LOGD("zygisk: pre app fork [%s]\n", process);
+        VLOG("zygisk: pre  forkAndSpecialize [%s]\n", process);
     } else {
-        LOGD("zygisk: pre specialize [%s]\n", process);
+        VLOG("zygisk: pre  specialize [%s]\n", process);
     }
 
     /* TODO: Handle MOUNT_EXTERNAL_NONE */
@@ -246,10 +225,10 @@ void HookContext::nativeSpecializeAppProcess_pre() {
 }
 
 void HookContext::nativeSpecializeAppProcess_post() {
-    if (flags[APP_FORK]) {
+    if (flags[FORK_AND_SPECIALIZE]) {
-        LOGD("zygisk: post app fork [%s]\n", process);
+        VLOG("zygisk: post forkAndSpecialize [%s]\n", process);
     } else {
-        LOGD("zygisk: post specialize [%s]\n", process);
+        VLOG("zygisk: post specialize [%s]\n", process);
     }
 
     env->ReleaseStringUTFChars(args->nice_name, process);
@@ -258,6 +237,18 @@ void HookContext::nativeSpecializeAppProcess_post() {
     g_ctx = nullptr;
 }
 
+void HookContext::nativeForkSystemServer_pre() {
+    pre_fork();
+    if (pid) return;
+    VLOG("zygisk: pre  forkSystemServer\n");
+}
+
+void HookContext::nativeForkSystemServer_post() {
+    run_finally f([]{ post_fork(); });
+    if (pid) return;
+    VLOG("zygisk: post forkSystemServer\n");
+}
+
 // -----------------------------------------------------------------
 
 int sigmask(int how, int signum) {
@@ -269,49 +260,34 @@ int sigmask(int how, int signum) {
 
 // Do our own fork before loading any 3rd party code
 // First block SIGCHLD, unblock after original fork is done
-#define PRE_FORK() \
+void HookContext::pre_fork() {
-    g_ctx = this;  \
+    g_ctx = this;
-    sigmask(SIG_BLOCK, SIGCHLD); \
+    sigmask(SIG_BLOCK, SIGCHLD);
-    pid = old_fork();            \
+    pid = old_fork();
-    if (pid != 0)  \
+}
-        return;
 
 // Unblock SIGCHLD in case the original method didn't
-#define POST_FORK() \
+void HookContext::post_fork() {
-    run_finally f([]{g_ctx = nullptr;}); \
+    sigmask(SIG_UNBLOCK, SIGCHLD);
-    sigmask(SIG_UNBLOCK, SIGCHLD);       \
+    g_ctx = nullptr;
-    if (pid != 0)   \
+}
-        return;
 
 void HookContext::nativeForkAndSpecialize_pre() {
-    PRE_FORK()
+    pre_fork();
-    flags[APP_FORK] = true;
+    flags[FORK_AND_SPECIALIZE] = true;
+    if (pid == 0)
         nativeSpecializeAppProcess_pre();
 }
 
 void HookContext::nativeForkAndSpecialize_post() {
-    POST_FORK()
+    if (pid == 0)
         nativeSpecializeAppProcess_post();
+    post_fork();
 }
 
-// -----------------------------------------------------------------
+} // namespace
 
-void HookContext::nativeForkSystemServer_pre() {
+static bool hook_refresh() {
-    PRE_FORK()
-    LOGD("zygisk: pre server fork\n");
-}
-
-void HookContext::nativeForkSystemServer_post() {
-    POST_FORK()
-    LOGD("zygisk: post server fork\n");
-}
-
-#undef PRE_FORK
-#undef POST_FORK
-
-// -----------------------------------------------------------------
-
-bool hook_refresh() {
     if (xhook_refresh(0) == 0) {
         xhook_clear();
         LOGI("zygisk: xhook success\n");
@@ -322,7 +298,7 @@ bool hook_refresh() {
     }
 }
 
-int hook_register(const char *path, const char *symbol, void *new_func, void **old_func) {
+static int hook_register(const char *path, const char *symbol, void *new_func, void **old_func) {
     int ret = xhook_register(path, symbol, new_func, old_func);
     if (ret != 0) {
         LOGE("hook: Failed to register hook \"%s\"\n", symbol);
@@ -332,8 +308,6 @@ int hook_register(const char *path, const char *symbol, void *new_func, void **o
     return 0;
 }
 
-} // namespace
-
 #define XHOOK_REGISTER_SYM(PATH_REGEX, SYM, NAME) \
     hook_register(PATH_REGEX, SYM, (void*) new_##NAME, (void **) &old_##NAME)
 
@@ -378,6 +352,8 @@ void hook_functions() {
 }
 
 bool unhook_functions() {
+    bool success = true;
+
     // Restore JNIEnv
     if (g_ctx->env->functions == new_functions) {
         g_ctx->env->functions = old_functions;
@@ -394,21 +370,27 @@ bool unhook_functions() {
     jni_hook::memory_block::release();
 
     // Unhook JNI methods
-    if (!jni_hook_list->empty() && old_jniRegisterNativeMethods(g_ctx->env,
+    for (const auto &[clz, methods] : *jni_hook_list) {
-            "com/android/internal/os/Zygote",
+        if (!methods.empty() && old_jniRegisterNativeMethods(
-            jni_hook_list->data(), jni_hook_list->size()) != 0) {
+                g_ctx->env, clz.data(), methods.data(), methods.size()) != 0) {
-        LOGE("hook: Failed to register JNI hook\n");
+            LOGE("zygisk: Failed to restore JNI hook of class [%s]\n", clz.data());
-        return false;
+            success = false;
+        }
     }
     delete jni_hook_list;
 
     // Unhook xhook
-    for (auto &[path, sym, old_func] : *xhook_list) {
+    for (const auto &[path, sym, old_func] : *xhook_list) {
         if (xhook_register(path, sym, *old_func, nullptr) != 0) {
-            LOGE("hook: Failed to register hook \"%s\"\n", sym);
+            LOGE("zygisk: Failed to register xhook [%s]\n", sym);
-            return false;
+            success = false;
         }
     }
     delete xhook_list;
-    return hook_refresh();
+    if (!hook_refresh()) {
+        LOGE("zygisk: Failed to restore xhook\n");
+        success = false;
+    }
+
+    return success;
 }

native/jni/zygisk/jni_hooks.hpp

@@ -1,13 +1,13 @@
 // Generated by gen_jni_hooks.py
 
+void *nativeForkAndSpecialize_orig = nullptr;
 jint nativeForkAndSpecialize_l(JNIEnv *env, jclass clazz, jint uid, jint gid, jintArray gids, jint runtime_flags, jobjectArray rlimits, jint mount_external, jstring se_info, jstring nice_name, jintArray fds_to_close, jstring instruction_set, jstring app_data_dir) {
     SpecializeAppProcessArgs args(uid, gid, gids, runtime_flags, mount_external, se_info, nice_name, instruction_set, app_data_dir);
     HookContext ctx;
     ctx.env = env;
-    ctx.clazz = clazz;
     ctx.raw_args = &args;
     ctx.nativeForkAndSpecialize_pre();
-    reinterpret_cast<decltype(&nativeForkAndSpecialize_l)>(HookContext::nativeForkAndSpecialize_orig)(
+    reinterpret_cast<decltype(&nativeForkAndSpecialize_l)>(nativeForkAndSpecialize_orig)(
         env, clazz, uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, nice_name, fds_to_close, instruction_set, app_data_dir
     );
     ctx.nativeForkAndSpecialize_post();
@@ -17,10 +17,9 @@ jint nativeForkAndSpecialize_o(JNIEnv *env, jclass clazz, jint uid, jint gid, ji
     SpecializeAppProcessArgs args(uid, gid, gids, runtime_flags, mount_external, se_info, nice_name, instruction_set, app_data_dir);
     HookContext ctx;
     ctx.env = env;
-    ctx.clazz = clazz;
     ctx.raw_args = &args;
     ctx.nativeForkAndSpecialize_pre();
-    reinterpret_cast<decltype(&nativeForkAndSpecialize_o)>(HookContext::nativeForkAndSpecialize_orig)(
+    reinterpret_cast<decltype(&nativeForkAndSpecialize_o)>(nativeForkAndSpecialize_orig)(
         env, clazz, uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, nice_name, fds_to_close, fds_to_ignore, instruction_set, app_data_dir
     );
     ctx.nativeForkAndSpecialize_post();
@@ -31,10 +30,9 @@ jint nativeForkAndSpecialize_p(JNIEnv *env, jclass clazz, jint uid, jint gid, ji
     args.is_child_zygote = &is_child_zygote;
     HookContext ctx;
     ctx.env = env;
-    ctx.clazz = clazz;
     ctx.raw_args = &args;
     ctx.nativeForkAndSpecialize_pre();
-    reinterpret_cast<decltype(&nativeForkAndSpecialize_p)>(HookContext::nativeForkAndSpecialize_orig)(
+    reinterpret_cast<decltype(&nativeForkAndSpecialize_p)>(nativeForkAndSpecialize_orig)(
         env, clazz, uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, nice_name, fds_to_close, fds_to_ignore, is_child_zygote, instruction_set, app_data_dir
     );
     ctx.nativeForkAndSpecialize_post();
@@ -46,10 +44,9 @@ jint nativeForkAndSpecialize_q_alt(JNIEnv *env, jclass clazz, jint uid, jint gid
     args.is_top_app = &is_top_app;
     HookContext ctx;
     ctx.env = env;
-    ctx.clazz = clazz;
     ctx.raw_args = &args;
     ctx.nativeForkAndSpecialize_pre();
-    reinterpret_cast<decltype(&nativeForkAndSpecialize_q_alt)>(HookContext::nativeForkAndSpecialize_orig)(
+    reinterpret_cast<decltype(&nativeForkAndSpecialize_q_alt)>(nativeForkAndSpecialize_orig)(
         env, clazz, uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, nice_name, fds_to_close, fds_to_ignore, is_child_zygote, instruction_set, app_data_dir, is_top_app
     );
     ctx.nativeForkAndSpecialize_post();
@@ -65,64 +62,59 @@ jint nativeForkAndSpecialize_r(JNIEnv *env, jclass clazz, jint uid, jint gid, ji
     args.mount_storage_dirs = &mount_storage_dirs;
     HookContext ctx;
     ctx.env = env;
-    ctx.clazz = clazz;
     ctx.raw_args = &args;
     ctx.nativeForkAndSpecialize_pre();
-    reinterpret_cast<decltype(&nativeForkAndSpecialize_r)>(HookContext::nativeForkAndSpecialize_orig)(
+    reinterpret_cast<decltype(&nativeForkAndSpecialize_r)>(nativeForkAndSpecialize_orig)(
         env, clazz, uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, nice_name, fds_to_close, fds_to_ignore, is_child_zygote, instruction_set, app_data_dir, is_top_app, pkg_data_info_list, whitelisted_data_info_list, mount_data_dirs, mount_storage_dirs
     );
     ctx.nativeForkAndSpecialize_post();
     return ctx.pid;
 }
-jint nativeForkAndSpecialize_samsung_m(JNIEnv *env, jclass clazz, jint uid, jint gid, jintArray gids, jint runtime_flags, jobjectArray rlimits, jint mount_external, jstring se_info, jint i1, jint i2, jstring nice_name, jintArray fds_to_close, jstring instruction_set, jstring app_data_dir) {
+jint nativeForkAndSpecialize_samsung_m(JNIEnv *env, jclass clazz, jint uid, jint gid, jintArray gids, jint runtime_flags, jobjectArray rlimits, jint mount_external, jstring se_info, jint _0, jint _1, jstring nice_name, jintArray fds_to_close, jstring instruction_set, jstring app_data_dir) {
     SpecializeAppProcessArgs args(uid, gid, gids, runtime_flags, mount_external, se_info, nice_name, instruction_set, app_data_dir);
     HookContext ctx;
     ctx.env = env;
-    ctx.clazz = clazz;
     ctx.raw_args = &args;
     ctx.nativeForkAndSpecialize_pre();
-    reinterpret_cast<decltype(&nativeForkAndSpecialize_samsung_m)>(HookContext::nativeForkAndSpecialize_orig)(
+    reinterpret_cast<decltype(&nativeForkAndSpecialize_samsung_m)>(nativeForkAndSpecialize_orig)(
-        env, clazz, uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, i1, i2, nice_name, fds_to_close, instruction_set, app_data_dir
+        env, clazz, uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, _0, _1, nice_name, fds_to_close, instruction_set, app_data_dir
     );
     ctx.nativeForkAndSpecialize_post();
     return ctx.pid;
 }
-jint nativeForkAndSpecialize_samsung_n(JNIEnv *env, jclass clazz, jint uid, jint gid, jintArray gids, jint runtime_flags, jobjectArray rlimits, jint mount_external, jstring se_info, jint i1, jint i2, jstring nice_name, jintArray fds_to_close, jstring instruction_set, jstring app_data_dir, jint i3) {
+jint nativeForkAndSpecialize_samsung_n(JNIEnv *env, jclass clazz, jint uid, jint gid, jintArray gids, jint runtime_flags, jobjectArray rlimits, jint mount_external, jstring se_info, jint _2, jint _3, jstring nice_name, jintArray fds_to_close, jstring instruction_set, jstring app_data_dir, jint _4) {
     SpecializeAppProcessArgs args(uid, gid, gids, runtime_flags, mount_external, se_info, nice_name, instruction_set, app_data_dir);
     HookContext ctx;
     ctx.env = env;
-    ctx.clazz = clazz;
     ctx.raw_args = &args;
     ctx.nativeForkAndSpecialize_pre();
-    reinterpret_cast<decltype(&nativeForkAndSpecialize_samsung_n)>(HookContext::nativeForkAndSpecialize_orig)(
+    reinterpret_cast<decltype(&nativeForkAndSpecialize_samsung_n)>(nativeForkAndSpecialize_orig)(
-        env, clazz, uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, i1, i2, nice_name, fds_to_close, instruction_set, app_data_dir, i3
+        env, clazz, uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, _2, _3, nice_name, fds_to_close, instruction_set, app_data_dir, _4
     );
     ctx.nativeForkAndSpecialize_post();
     return ctx.pid;
 }
-jint nativeForkAndSpecialize_samsung_o(JNIEnv *env, jclass clazz, jint uid, jint gid, jintArray gids, jint runtime_flags, jobjectArray rlimits, jint mount_external, jstring se_info, jint i1, jint i2, jstring nice_name, jintArray fds_to_close, jintArray fds_to_ignore, jstring instruction_set, jstring app_data_dir) {
+jint nativeForkAndSpecialize_samsung_o(JNIEnv *env, jclass clazz, jint uid, jint gid, jintArray gids, jint runtime_flags, jobjectArray rlimits, jint mount_external, jstring se_info, jint _5, jint _6, jstring nice_name, jintArray fds_to_close, jintArray fds_to_ignore, jstring instruction_set, jstring app_data_dir) {
     SpecializeAppProcessArgs args(uid, gid, gids, runtime_flags, mount_external, se_info, nice_name, instruction_set, app_data_dir);
     HookContext ctx;
     ctx.env = env;
-    ctx.clazz = clazz;
     ctx.raw_args = &args;
     ctx.nativeForkAndSpecialize_pre();
-    reinterpret_cast<decltype(&nativeForkAndSpecialize_samsung_o)>(HookContext::nativeForkAndSpecialize_orig)(
+    reinterpret_cast<decltype(&nativeForkAndSpecialize_samsung_o)>(nativeForkAndSpecialize_orig)(
-        env, clazz, uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, i1, i2, nice_name, fds_to_close, fds_to_ignore, instruction_set, app_data_dir
+        env, clazz, uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, _5, _6, nice_name, fds_to_close, fds_to_ignore, instruction_set, app_data_dir
     );
     ctx.nativeForkAndSpecialize_post();
     return ctx.pid;
 }
-jint nativeForkAndSpecialize_samsung_p(JNIEnv *env, jclass clazz, jint uid, jint gid, jintArray gids, jint runtime_flags, jobjectArray rlimits, jint mount_external, jstring se_info, jint i1, jint i2, jstring nice_name, jintArray fds_to_close, jintArray fds_to_ignore, jboolean is_child_zygote, jstring instruction_set, jstring app_data_dir) {
+jint nativeForkAndSpecialize_samsung_p(JNIEnv *env, jclass clazz, jint uid, jint gid, jintArray gids, jint runtime_flags, jobjectArray rlimits, jint mount_external, jstring se_info, jint _7, jint _8, jstring nice_name, jintArray fds_to_close, jintArray fds_to_ignore, jboolean is_child_zygote, jstring instruction_set, jstring app_data_dir) {
     SpecializeAppProcessArgs args(uid, gid, gids, runtime_flags, mount_external, se_info, nice_name, instruction_set, app_data_dir);
     args.is_child_zygote = &is_child_zygote;
     HookContext ctx;
     ctx.env = env;
-    ctx.clazz = clazz;
     ctx.raw_args = &args;
     ctx.nativeForkAndSpecialize_pre();
-    reinterpret_cast<decltype(&nativeForkAndSpecialize_samsung_p)>(HookContext::nativeForkAndSpecialize_orig)(
+    reinterpret_cast<decltype(&nativeForkAndSpecialize_samsung_p)>(nativeForkAndSpecialize_orig)(
-        env, clazz, uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, i1, i2, nice_name, fds_to_close, fds_to_ignore, is_child_zygote, instruction_set, app_data_dir
+        env, clazz, uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, _7, _8, nice_name, fds_to_close, fds_to_ignore, is_child_zygote, instruction_set, app_data_dir
     );
     ctx.nativeForkAndSpecialize_post();
     return ctx.pid;
@@ -176,15 +168,15 @@ const JNINativeMethod nativeForkAndSpecialize_methods[] = {
 };
 constexpr int nativeForkAndSpecialize_methods_num = std::size(nativeForkAndSpecialize_methods);
 
+void *nativeSpecializeAppProcess_orig = nullptr;
 void nativeSpecializeAppProcess_q(JNIEnv *env, jclass clazz, jint uid, jint gid, jintArray gids, jint runtime_flags, jobjectArray rlimits, jint mount_external, jstring se_info, jstring nice_name, jboolean is_child_zygote, jstring instruction_set, jstring app_data_dir) {
     SpecializeAppProcessArgs args(uid, gid, gids, runtime_flags, mount_external, se_info, nice_name, instruction_set, app_data_dir);
     args.is_child_zygote = &is_child_zygote;
     HookContext ctx;
     ctx.env = env;
-    ctx.clazz = clazz;
     ctx.raw_args = &args;
     ctx.nativeSpecializeAppProcess_pre();
-    reinterpret_cast<decltype(&nativeSpecializeAppProcess_q)>(HookContext::nativeSpecializeAppProcess_orig)(
+    reinterpret_cast<decltype(&nativeSpecializeAppProcess_q)>(nativeSpecializeAppProcess_orig)(
         env, clazz, uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, nice_name, is_child_zygote, instruction_set, app_data_dir
     );
     ctx.nativeSpecializeAppProcess_post();
@@ -195,10 +187,9 @@ void nativeSpecializeAppProcess_q_alt(JNIEnv *env, jclass clazz, jint uid, jint
     args.is_top_app = &is_top_app;
     HookContext ctx;
     ctx.env = env;
-    ctx.clazz = clazz;
     ctx.raw_args = &args;
     ctx.nativeSpecializeAppProcess_pre();
-    reinterpret_cast<decltype(&nativeSpecializeAppProcess_q_alt)>(HookContext::nativeSpecializeAppProcess_orig)(
+    reinterpret_cast<decltype(&nativeSpecializeAppProcess_q_alt)>(nativeSpecializeAppProcess_orig)(
         env, clazz, uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, nice_name, is_child_zygote, instruction_set, app_data_dir, is_top_app
     );
     ctx.nativeSpecializeAppProcess_post();
@@ -213,24 +204,22 @@ void nativeSpecializeAppProcess_r(JNIEnv *env, jclass clazz, jint uid, jint gid,
     args.mount_storage_dirs = &mount_storage_dirs;
     HookContext ctx;
     ctx.env = env;
-    ctx.clazz = clazz;
     ctx.raw_args = &args;
     ctx.nativeSpecializeAppProcess_pre();
-    reinterpret_cast<decltype(&nativeSpecializeAppProcess_r)>(HookContext::nativeSpecializeAppProcess_orig)(
+    reinterpret_cast<decltype(&nativeSpecializeAppProcess_r)>(nativeSpecializeAppProcess_orig)(
         env, clazz, uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, nice_name, is_child_zygote, instruction_set, app_data_dir, is_top_app, pkg_data_info_list, whitelisted_data_info_list, mount_data_dirs, mount_storage_dirs
     );
     ctx.nativeSpecializeAppProcess_post();
 }
-void nativeSpecializeAppProcess_samsung_q(JNIEnv *env, jclass clazz, jint uid, jint gid, jintArray gids, jint runtime_flags, jobjectArray rlimits, jint mount_external, jstring se_info, jint i1, jint i2, jstring nice_name, jboolean is_child_zygote, jstring instruction_set, jstring app_data_dir) {
+void nativeSpecializeAppProcess_samsung_q(JNIEnv *env, jclass clazz, jint uid, jint gid, jintArray gids, jint runtime_flags, jobjectArray rlimits, jint mount_external, jstring se_info, jint _9, jint _10, jstring nice_name, jboolean is_child_zygote, jstring instruction_set, jstring app_data_dir) {
     SpecializeAppProcessArgs args(uid, gid, gids, runtime_flags, mount_external, se_info, nice_name, instruction_set, app_data_dir);
     args.is_child_zygote = &is_child_zygote;
     HookContext ctx;
     ctx.env = env;
-    ctx.clazz = clazz;
     ctx.raw_args = &args;
     ctx.nativeSpecializeAppProcess_pre();
-    reinterpret_cast<decltype(&nativeSpecializeAppProcess_samsung_q)>(HookContext::nativeSpecializeAppProcess_orig)(
+    reinterpret_cast<decltype(&nativeSpecializeAppProcess_samsung_q)>(nativeSpecializeAppProcess_orig)(
-        env, clazz, uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, i1, i2, nice_name, is_child_zygote, instruction_set, app_data_dir
+        env, clazz, uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, _9, _10, nice_name, is_child_zygote, instruction_set, app_data_dir
     );
     ctx.nativeSpecializeAppProcess_post();
 }
@@ -258,28 +247,27 @@ const JNINativeMethod nativeSpecializeAppProcess_methods[] = {
 };
 constexpr int nativeSpecializeAppProcess_methods_num = std::size(nativeSpecializeAppProcess_methods);
 
+void *nativeForkSystemServer_orig = nullptr;
 jint nativeForkSystemServer_l(JNIEnv *env, jclass clazz, jint uid, jint gid, jintArray gids, jint runtime_flags, jobjectArray rlimits, jlong permitted_capabilities, jlong effective_capabilities) {
     ForkSystemServerArgs args(uid, gid, gids, runtime_flags, permitted_capabilities, effective_capabilities);
     HookContext ctx;
     ctx.env = env;
-    ctx.clazz = clazz;
     ctx.raw_args = &args;
     ctx.nativeForkSystemServer_pre();
-    reinterpret_cast<decltype(&nativeForkSystemServer_l)>(HookContext::nativeForkSystemServer_orig)(
+    reinterpret_cast<decltype(&nativeForkSystemServer_l)>(nativeForkSystemServer_orig)(
         env, clazz, uid, gid, gids, runtime_flags, rlimits, permitted_capabilities, effective_capabilities
     );
     ctx.nativeForkSystemServer_post();
     return ctx.pid;
 }
-jint nativeForkSystemServer_samsung_q(JNIEnv *env, jclass clazz, jint uid, jint gid, jintArray gids, jint runtime_flags, jint i1, jint i2, jobjectArray rlimits, jlong permitted_capabilities, jlong effective_capabilities) {
+jint nativeForkSystemServer_samsung_q(JNIEnv *env, jclass clazz, jint uid, jint gid, jintArray gids, jint runtime_flags, jint _11, jint _12, jobjectArray rlimits, jlong permitted_capabilities, jlong effective_capabilities) {
     ForkSystemServerArgs args(uid, gid, gids, runtime_flags, permitted_capabilities, effective_capabilities);
     HookContext ctx;
     ctx.env = env;
-    ctx.clazz = clazz;
     ctx.raw_args = &args;
     ctx.nativeForkSystemServer_pre();
-    reinterpret_cast<decltype(&nativeForkSystemServer_samsung_q)>(HookContext::nativeForkSystemServer_orig)(
+    reinterpret_cast<decltype(&nativeForkSystemServer_samsung_q)>(nativeForkSystemServer_orig)(
-        env, clazz, uid, gid, gids, runtime_flags, i1, i2, rlimits, permitted_capabilities, effective_capabilities
+        env, clazz, uid, gid, gids, runtime_flags, _11, _12, rlimits, permitted_capabilities, effective_capabilities
     );
     ctx.nativeForkSystemServer_post();
     return ctx.pid;
@@ -297,3 +285,32 @@ const JNINativeMethod nativeForkSystemServer_methods[] = {
     },
 };
 constexpr int nativeForkSystemServer_methods_num = std::size(nativeForkSystemServer_methods);
+
+unique_ptr<JNINativeMethod[]> hookAndSaveJNIMethods(const char *className, const JNINativeMethod *methods, int numMethods) {
+    unique_ptr<JNINativeMethod[]> newMethods;
+    int clz_id = -1;
+    int hook_cnt = 0;
+    do {
+        if (className == "com/android/internal/os/Zygote"sv) {
+            clz_id = 0;
+            hook_cnt = 3;
+            break;
+        }
+    } while (false);
+    if (hook_cnt) {
+        newMethods = make_unique<JNINativeMethod[]>(numMethods);
+        memcpy(newMethods.get(), methods, sizeof(JNINativeMethod) * numMethods);
+    }
+    auto &class_map = (*jni_method_map)[className];
+    for (int i = 0; i < numMethods; ++i) {
+        class_map[methods[i].name][methods[i].signature] = methods[i].fnPtr;
+        if (hook_cnt == 0) continue;
+        if (clz_id == 0) {
+            HOOK_JNI(nativeForkAndSpecialize)
+            HOOK_JNI(nativeSpecializeAppProcess)
+            HOOK_JNI(nativeForkSystemServer)
+            continue;
+        }
+    }
+    return newMethods;
+}