Commit 3ea10b7c authored by topjohnwu's avatar topjohnwu

Reorganize injection code

parent 1ec33863
#pragma once
#include <jni.h>
struct SpecializeAppProcessArgs {
jint &uid;
jint &gid;
jintArray &gids;
jint &runtime_flags;
jint &mount_external;
jstring &se_info;
jstring &nice_name;
jstring &instruction_set;
jstring &app_data_dir;
/* Optional */
jboolean *is_child_zygote = nullptr;
jboolean *is_top_app = nullptr;
jobjectArray *pkg_data_info_list = nullptr;
jobjectArray *whitelisted_data_info_list = nullptr;
jboolean *mount_data_dirs = nullptr;
jboolean *mount_storage_dirs = nullptr;
SpecializeAppProcessArgs(
jint &uid, jint &gid, jintArray &gids, jint &runtime_flags,
jint &mount_external, jstring &se_info, jstring &nice_name,
jstring &instruction_set, jstring &app_data_dir) :
uid(uid), gid(gid), gids(gids), runtime_flags(runtime_flags),
mount_external(mount_external), se_info(se_info), nice_name(nice_name),
instruction_set(instruction_set), app_data_dir(app_data_dir) {}
};
struct ForkSystemServerArgs {
jint &uid;
jint &gid;
jintArray &gids;
jint &runtime_flags;
jlong &permitted_capabilities;
jlong &effective_capabilities;
ForkSystemServerArgs(
jint &uid, jint &gid, jintArray &gids, jint &runtime_flags,
jlong &permitted_capabilities, jlong &effective_capabilities) :
uid(uid), gid(gid), gids(gids), runtime_flags(runtime_flags),
permitted_capabilities(permitted_capabilities),
effective_capabilities(effective_capabilities) {}
};
......@@ -150,7 +150,7 @@ def gen_definitions(methods, base_name):
jni_ret = 'V'
for m in methods:
func_name = f'{base_name}_{m.name}'
decl += ind(0) + f'static {cpp_ret} {func_name}(JNIEnv *env, jclass clazz, {m.cpp()}) {{'
decl += ind(0) + f'{cpp_ret} {func_name}(JNIEnv *env, jclass clazz, {m.cpp()}) {{'
decl += ind(1) + 'HookContext ctx{};'
if base_name == 'nativeForkSystemServer':
decl += ind(1) + 'ForkSystemServerArgs args(uid, gid, gids, runtime_flags, permitted_capabilities, effective_capabilities);'
......@@ -168,7 +168,6 @@ def gen_definitions(methods, base_name):
decl += ret_stat
decl += ind(0) + '}'
decl += ind(0) + 'namespace {'
decl += ind(0) + f'const JNINativeMethod {base_name}_methods[] = {{'
for m in methods:
decl += ind(1) + '{'
......@@ -177,8 +176,7 @@ def gen_definitions(methods, base_name):
decl += ind(2) + f'(void *) &{base_name}_{m.name}'
decl += ind(1) + '},'
decl += ind(0) + '};'
decl += ind(0) + f'const int {base_name}_methods_num = std::size({base_name}_methods);'
decl += ind(0) + '} // namespace'
decl += ind(0) + f'constexpr int {base_name}_methods_num = std::size({base_name}_methods);'
decl += ind(0)
return decl
......
......@@ -6,55 +6,14 @@
#include "inject.hpp"
#include "memory.hpp"
#include "api.hpp"
using namespace std;
using jni_hook::hash_map;
using jni_hook::tree_map;
using xstring = jni_hook::string;
struct SpecializeAppProcessArgs {
jint &uid;
jint &gid;
jintArray &gids;
jint &runtime_flags;
jint &mount_external;
jstring &se_info;
jstring &nice_name;
jstring &instruction_set;
jstring &app_data_dir;
/* Optional */
jboolean *is_child_zygote = nullptr;
jboolean *is_top_app = nullptr;
jobjectArray *pkg_data_info_list = nullptr;
jobjectArray *whitelisted_data_info_list = nullptr;
jboolean *mount_data_dirs = nullptr;
jboolean *mount_storage_dirs = nullptr;
SpecializeAppProcessArgs(
jint &uid, jint &gid, jintArray &gids, jint &runtime_flags,
jint &mount_external, jstring &se_info, jstring &nice_name,
jstring &instruction_set, jstring &app_data_dir) :
uid(uid), gid(gid), gids(gids), runtime_flags(runtime_flags),
mount_external(mount_external), se_info(se_info), nice_name(nice_name),
instruction_set(instruction_set), app_data_dir(app_data_dir) {}
};
struct ForkSystemServerArgs {
jint &uid;
jint &gid;
jintArray &gids;
jint &runtime_flags;
jlong &permitted_capabilities;
jlong &effective_capabilities;
ForkSystemServerArgs(
jint &uid, jint &gid, jintArray &gids, jint &runtime_flags,
jlong &permitted_capabilities, jlong &effective_capabilities) :
uid(uid), gid(gid), gids(gids), runtime_flags(runtime_flags),
permitted_capabilities(permitted_capabilities),
effective_capabilities(effective_capabilities) {}
};
namespace {
struct HookContext {
int pid;
......@@ -65,33 +24,32 @@ struct HookContext {
void *raw_args;
};
};
struct vtable_t;
static vector<tuple<const char *, const char *, void **>> *xhook_list;
static vector<JNINativeMethod> *jni_hook_list;
static hash_map<xstring, tree_map<xstring, tree_map<xstring, void *>>> *jni_method_map;
static HookContext *current_ctx;
static JavaVM *g_jvm;
static vtable_t *gAppRuntimeVTable;
static const JNINativeInterface *old_functions;
static JNINativeInterface *new_functions;
// Global variables
vector<tuple<const char *, const char *, void **>> *xhook_list;
vector<JNINativeMethod> *jni_hook_list;
hash_map<xstring, tree_map<xstring, tree_map<xstring, void *>>> *jni_method_map;
#define DCL_HOOK_FUNC(ret, func, ...) \
static ret (*old_##func)(__VA_ARGS__); \
static ret new_##func(__VA_ARGS__)
HookContext *current_ctx;
JavaVM *g_jvm;
const JNINativeInterface *old_functions;
JNINativeInterface *new_functions;
#define DCL_JNI_FUNC(name) \
static void *name##_orig; \
extern const JNINativeMethod name##_methods[]; \
extern const int name##_methods_num;
void *name##_orig; \
void name##_pre(HookContext *ctx, JNIEnv *env, jclass clazz); \
void name##_post(HookContext *ctx, JNIEnv *env, jclass clazz);
namespace {
// JNI method declarations
DCL_JNI_FUNC(nativeForkAndSpecialize)
DCL_JNI_FUNC(nativeSpecializeAppProcess)
DCL_JNI_FUNC(nativeForkSystemServer)
}
#undef DCL_JNI_FUNC
// JNI method definitions
// Includes all method signatures of all supported Android versions
#include "jni_hooks.hpp"
#define HOOK_JNI(method) \
if (methods[i].name == #method##sv) { \
......@@ -108,7 +66,7 @@ if (methods[i].name == #method##sv) { \
continue; \
}
static unique_ptr<JNINativeMethod[]> hookAndSaveJNIMethods(
unique_ptr<JNINativeMethod[]> hookAndSaveJNIMethods(
JNIEnv *env, const char *className, const JNINativeMethod *methods, int numMethods) {
if (g_jvm == nullptr) {
// Save for later unhooking
......@@ -135,9 +93,11 @@ static unique_ptr<JNINativeMethod[]> hookAndSaveJNIMethods(
return newMethods;
}
static jclass gClassRef;
static jmethodID class_getName;
static string get_class_name(JNIEnv *env, jclass clazz) {
#undef HOOK_JNI
jclass gClassRef;
jmethodID class_getName;
string get_class_name(JNIEnv *env, jclass clazz) {
if (!gClassRef) {
jclass cls = env->FindClass("java/lang/Class");
gClassRef = (jclass) env->NewGlobalRef(cls);
......@@ -154,7 +114,11 @@ static string get_class_name(JNIEnv *env, jclass clazz) {
// -----------------------------------------------------------------
static jint new_env_RegisterNatives(
#define DCL_HOOK_FUNC(ret, func, ...) \
ret (*old_##func)(__VA_ARGS__); \
ret new_##func(__VA_ARGS__)
jint new_env_RegisterNatives(
JNIEnv *env, jclass clazz, const JNINativeMethod *methods, jint numMethods) {
auto className = get_class_name(env, clazz);
LOGD("hook: JNIEnv->RegisterNatives %s\n", className.data());
......@@ -196,6 +160,8 @@ struct vtable_t {
void (*onExit)(void *self, int code);
};
vtable_t *gAppRuntimeVTable;
// This method is a trampoline for hooking JNIEnv->RegisterNatives
DCL_HOOK_FUNC(void, onVmCreated, void *self, JNIEnv *env) {
LOGD("hook: AppRuntime::onVmCreated\n");
......@@ -215,7 +181,7 @@ DCL_HOOK_FUNC(void, onVmCreated, void *self, JNIEnv *env) {
}
// This method is a trampoline for swizzling android::AppRuntime vtable
static bool swizzled = false;
bool swizzled = false;
DCL_HOOK_FUNC(void, setArgv0, void *self, const char *argv0, bool setProcName) {
if (swizzled) {
old_setArgv0(self, argv0, setProcName);
......@@ -236,9 +202,11 @@ DCL_HOOK_FUNC(void, setArgv0, void *self, const char *argv0, bool setProcName) {
old_setArgv0(self, argv0, setProcName);
}
#undef DCL_HOOK_FUNC
// -----------------------------------------------------------------
static void nativeSpecializeAppProcess_pre(HookContext *ctx, JNIEnv *env, jclass clazz) {
void nativeSpecializeAppProcess_pre(HookContext *ctx, JNIEnv *env, jclass clazz) {
current_ctx = ctx;
const char *process = env->GetStringUTFChars(ctx->args->nice_name, nullptr);
LOGD("hook: %s %s\n", __FUNCTION__, process);
......@@ -252,7 +220,7 @@ static void nativeSpecializeAppProcess_pre(HookContext *ctx, JNIEnv *env, jclass
env->ReleaseStringUTFChars(ctx->args->nice_name, process);
}
static void nativeSpecializeAppProcess_post(HookContext *ctx, JNIEnv *env, jclass clazz) {
void nativeSpecializeAppProcess_post(HookContext *ctx, JNIEnv *env, jclass clazz) {
current_ctx = nullptr;
LOGD("hook: %s\n", __FUNCTION__);
......@@ -262,7 +230,7 @@ static void nativeSpecializeAppProcess_post(HookContext *ctx, JNIEnv *env, jclas
// -----------------------------------------------------------------
static int sigmask(int how, int signum) {
int sigmask(int how, int signum) {
sigset_t set;
sigemptyset(&set);
sigaddset(&set, signum);
......@@ -285,19 +253,19 @@ static int sigmask(int how, int signum) {
if (ctx->pid != 0)\
return;
static void nativeForkAndSpecialize_pre(HookContext *ctx, JNIEnv *env, jclass clazz) {
void nativeForkAndSpecialize_pre(HookContext *ctx, JNIEnv *env, jclass clazz) {
PRE_FORK();
nativeSpecializeAppProcess_pre(ctx, env, clazz);
}
static void nativeForkAndSpecialize_post(HookContext *ctx, JNIEnv *env, jclass clazz) {
void nativeForkAndSpecialize_post(HookContext *ctx, JNIEnv *env, jclass clazz) {
POST_FORK();
nativeSpecializeAppProcess_post(ctx, env, clazz);
}
// -----------------------------------------------------------------
static void nativeForkSystemServer_pre(HookContext *ctx, JNIEnv *env, jclass clazz) {
void nativeForkSystemServer_pre(HookContext *ctx, JNIEnv *env, jclass clazz) {
if (env->functions == new_functions) {
// Restore JNIEnv
env->functions = old_functions;
......@@ -312,7 +280,7 @@ static void nativeForkSystemServer_pre(HookContext *ctx, JNIEnv *env, jclass cla
LOGD("hook: %s\n", __FUNCTION__);
}
static void nativeForkSystemServer_post(HookContext *ctx, JNIEnv *env, jclass clazz) {
void nativeForkSystemServer_post(HookContext *ctx, JNIEnv *env, jclass clazz) {
POST_FORK();
LOGD("hook: %s\n", __FUNCTION__);
}
......@@ -322,7 +290,7 @@ static void nativeForkSystemServer_post(HookContext *ctx, JNIEnv *env, jclass cl
// -----------------------------------------------------------------
static bool hook_refresh() {
bool hook_refresh() {
if (xhook_refresh(0) == 0) {
xhook_clear();
LOGI("hook: xhook success\n");
......@@ -333,7 +301,7 @@ static bool hook_refresh() {
}
}
static int hook_register(const char *path, const char *symbol, void *new_func, void **old_func) {
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);
......@@ -343,6 +311,8 @@ static int hook_register(const char *path, const char *symbol, void *new_func, v
return 0;
}
} // namespace
template<class T>
static inline void default_new(T *&p) { p = new T(); }
......@@ -418,6 +388,3 @@ bool unhook_functions() {
delete xhook_list;
return hook_refresh();
}
// JNI method definitions, include all method signatures of past Android versions
#include "jni_hooks.hpp"
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