mirror of
https://github.com/topjohnwu/Magisk.git
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289 lines
10 KiB
Python
Executable File
289 lines
10 KiB
Python
Executable File
#!/usr/bin/env python3
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primitives = ['jint', 'jboolean', 'jlong']
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class JType:
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def __init__(self, cpp, jni):
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self.cpp = cpp
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self.jni = jni
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class JArray(JType):
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def __init__(self, type):
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if type.cpp in primitives:
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name = type.cpp + 'Array'
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else:
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name = 'jobjectArray'
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super().__init__(name, '[' + type.jni)
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class Argument:
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def __init__(self, name, type, set_arg = False):
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self.name = name
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self.type = type
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self.set_arg = set_arg
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def cpp(self):
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return f'{self.type.cpp} {self.name}'
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# Args we don't care, give it an auto generated name
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class Anon(Argument):
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cnt = 0
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def __init__(self, type):
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super().__init__(f'_{Anon.cnt}', type)
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Anon.cnt += 1
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class Return:
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def __init__(self, value, type):
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self.value = value
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self.type = type
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class Method:
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def __init__(self, name, ret, args):
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self.name = name
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self.ret = ret
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self.args = args
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def cpp(self):
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return ', '.join(map(lambda x: x.cpp(), self.args))
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def name_list(self):
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return ', '.join(map(lambda x: x.name, self.args))
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def jni(self):
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args = ''.join(map(lambda x: x.type.jni, self.args))
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return f'({args}){self.ret.type.jni}'
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def body(self):
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return ''
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class JNIHook(Method):
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def __init__(self, ver, ret, args):
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name = f'{self.base_name()}_{ver}'
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super().__init__(name, ret, args)
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def base_name(self):
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return ''
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def orig_method(self):
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return f'reinterpret_cast<decltype(&{self.name})>({self.base_name()}_orig)'
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def ind(i):
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return '\n' + ' ' * i
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# Common types
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jint = JType('jint', 'I')
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jintArray = JArray(jint)
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jstring = JType('jstring', 'Ljava/lang/String;')
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jboolean = JType('jboolean', 'Z')
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jlong = JType('jlong', 'J')
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void = JType('void', 'V')
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class ForkAndSpec(JNIHook):
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def __init__(self, ver, args):
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super().__init__(ver, Return('ctx.pid', jint), args)
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def base_name(self):
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return 'nativeForkAndSpecialize'
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def init_args(self):
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return 'AppSpecializeArgs_v3 args(uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, nice_name, instruction_set, app_data_dir);'
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def body(self):
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decl = ''
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decl += ind(1) + self.init_args()
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for a in self.args:
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if a.set_arg:
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decl += ind(1) + f'args.{a.name} = &{a.name};'
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decl += ind(1) + 'HookContext ctx;'
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decl += ind(1) + 'ctx.env = env;'
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decl += ind(1) + 'ctx.raw_args = &args;'
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decl += ind(1) + f'ctx.{self.base_name()}_pre();'
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decl += ind(1) + self.orig_method() + '('
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decl += ind(2) + f'env, clazz, {self.name_list()}'
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decl += ind(1) + ');'
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decl += ind(1) + f'ctx.{self.base_name()}_post();'
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return decl
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class SpecApp(ForkAndSpec):
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def __init__(self, ver, args):
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super().__init__(ver, args)
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self.ret = Return('', void)
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def base_name(self):
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return 'nativeSpecializeAppProcess'
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class ForkServer(ForkAndSpec):
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def base_name(self):
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return 'nativeForkSystemServer'
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def init_args(self):
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return 'ServerSpecializeArgs_v1 args(uid, gid, gids, runtime_flags, permitted_capabilities, effective_capabilities);'
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# Common args
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uid = Argument('uid', jint)
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gid = Argument('gid', jint)
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gids = Argument('gids', jintArray)
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runtime_flags = Argument('runtime_flags', jint)
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rlimits = Argument('rlimits', JArray(jintArray))
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mount_external = Argument('mount_external', jint)
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se_info = Argument('se_info', jstring)
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nice_name = Argument('nice_name', jstring)
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fds_to_close = Argument('fds_to_close', jintArray)
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instruction_set = Argument('instruction_set', jstring)
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app_data_dir = Argument('app_data_dir', jstring)
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# o
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fds_to_ignore = Argument('fds_to_ignore', jintArray, True)
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# p
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is_child_zygote = Argument('is_child_zygote', jboolean, True)
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# q_alt
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is_top_app = Argument('is_top_app', jboolean, True)
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# r
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pkg_data_info_list = Argument('pkg_data_info_list', JArray(jstring), True)
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whitelisted_data_info_list = Argument('whitelisted_data_info_list', JArray(jstring), True)
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mount_data_dirs = Argument('mount_data_dirs', jboolean, True)
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mount_storage_dirs = Argument('mount_storage_dirs', jboolean, True)
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# server
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permitted_capabilities = Argument('permitted_capabilities', jlong)
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effective_capabilities = Argument('effective_capabilities', jlong)
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# Method definitions
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fas_l = ForkAndSpec('l', [uid, gid, gids, runtime_flags, rlimits, mount_external,
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se_info, nice_name, fds_to_close, instruction_set, app_data_dir])
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fas_o = ForkAndSpec('o', [uid, gid, gids, runtime_flags, rlimits, mount_external,
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se_info, nice_name, fds_to_close, fds_to_ignore, instruction_set, app_data_dir])
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fas_p = ForkAndSpec('p', [uid, gid, gids, runtime_flags, rlimits, mount_external, se_info,
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nice_name, fds_to_close, fds_to_ignore, is_child_zygote, instruction_set, app_data_dir])
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fas_q_alt = ForkAndSpec('q_alt', [uid, gid, gids, runtime_flags, rlimits, mount_external, se_info,
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nice_name, fds_to_close, fds_to_ignore, is_child_zygote, instruction_set, app_data_dir, is_top_app])
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fas_r = ForkAndSpec('r', [uid, gid, gids, runtime_flags, rlimits, mount_external, se_info,
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nice_name, fds_to_close, fds_to_ignore, is_child_zygote, instruction_set, app_data_dir, is_top_app,
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pkg_data_info_list, whitelisted_data_info_list, mount_data_dirs, mount_storage_dirs])
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fas_samsung_m = ForkAndSpec('samsung_m', [uid, gid, gids, runtime_flags, rlimits, mount_external,
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se_info, Anon(jint), Anon(jint), nice_name, fds_to_close, instruction_set, app_data_dir])
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fas_samsung_n = ForkAndSpec('samsung_n', [uid, gid, gids, runtime_flags, rlimits, mount_external,
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se_info, Anon(jint), Anon(jint), nice_name, fds_to_close, instruction_set, app_data_dir, Anon(jint)])
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fas_samsung_o = ForkAndSpec('samsung_o', [uid, gid, gids, runtime_flags, rlimits, mount_external,
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se_info, Anon(jint), Anon(jint), nice_name, fds_to_close, fds_to_ignore, instruction_set, app_data_dir])
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fas_samsung_p = ForkAndSpec('samsung_p', [uid, gid, gids, runtime_flags, rlimits, mount_external,
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se_info, Anon(jint), Anon(jint), nice_name, fds_to_close, fds_to_ignore, is_child_zygote,
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instruction_set, app_data_dir])
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spec_q = SpecApp('q', [uid, gid, gids, runtime_flags, rlimits, mount_external, se_info,
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nice_name, is_child_zygote, instruction_set, app_data_dir])
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spec_q_alt = SpecApp('q_alt', [uid, gid, gids, runtime_flags, rlimits, mount_external, se_info,
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nice_name, is_child_zygote, instruction_set, app_data_dir, is_top_app])
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spec_r = SpecApp('r', [uid, gid, gids, runtime_flags, rlimits, mount_external, se_info, nice_name,
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is_child_zygote, instruction_set, app_data_dir, is_top_app, pkg_data_info_list,
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whitelisted_data_info_list, mount_data_dirs, mount_storage_dirs])
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spec_samsung_q = SpecApp('samsung_q', [uid, gid, gids, runtime_flags, rlimits, mount_external,
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se_info, Anon(jint), Anon(jint), nice_name, is_child_zygote, instruction_set, app_data_dir])
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server_l = ForkServer('l', [uid, gid, gids, runtime_flags, rlimits,
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permitted_capabilities, effective_capabilities])
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server_samsung_q = ForkServer('samsung_q', [uid, gid, gids, runtime_flags, Anon(jint), Anon(jint), rlimits,
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permitted_capabilities, effective_capabilities])
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hook_map = {}
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def gen_jni_def(clz, methods):
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if clz not in hook_map:
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hook_map[clz] = []
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decl = ''
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for m in methods:
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decl += ind(0) + f'{m.ret.type.cpp} {m.name}(JNIEnv *env, jclass clazz, {m.cpp()}) {{'
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decl += m.body()
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if m.ret.value:
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decl += ind(1) + f'return {m.ret.value};'
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decl += ind(0) + '}'
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decl += ind(0) + f'const JNINativeMethod {m.base_name()}_methods[] = {{'
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for m in methods:
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decl += ind(1) + '{'
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decl += ind(2) + f'"{m.base_name()}",'
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decl += ind(2) + f'"{m.jni()}",'
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decl += ind(2) + f'(void *) &{m.name}'
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decl += ind(1) + '},'
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decl += ind(0) + '};'
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decl = ind(0) + f'void *{m.base_name()}_orig = nullptr;' + decl
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decl += ind(0) + f'constexpr int {m.base_name()}_methods_num = std::size({m.base_name()}_methods);'
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decl += ind(0)
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hook_map[clz].append(m.base_name())
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return decl
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def gen_jni_hook():
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decl = ''
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decl += ind(0) + 'unique_ptr<JNINativeMethod[]> hookAndSaveJNIMethods(const char *className, const JNINativeMethod *methods, int numMethods) {'
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decl += ind(1) + 'unique_ptr<JNINativeMethod[]> newMethods;'
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decl += ind(1) + 'int clz_id = -1;'
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decl += ind(1) + 'int hook_cnt = 0;'
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decl += ind(1) + 'do {'
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for index, (clz, methods) in enumerate(hook_map.items()):
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decl += ind(2) + f'if (className == "{clz}"sv) {{'
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decl += ind(3) + f'clz_id = {index};'
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decl += ind(3) + f'hook_cnt = {len(methods)};'
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decl += ind(3) + 'break;'
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decl += ind(2) + '}'
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decl += ind(1) + '} while (false);'
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decl += ind(1) + 'if (hook_cnt) {'
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decl += ind(2) + 'newMethods = make_unique<JNINativeMethod[]>(numMethods);'
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decl += ind(2) + 'memcpy(newMethods.get(), methods, sizeof(JNINativeMethod) * numMethods);'
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decl += ind(1) + '}'
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decl += ind(1) + 'auto &class_map = (*jni_method_map)[className];'
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decl += ind(1) + 'for (int i = 0; i < numMethods; ++i) {'
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for index, methods in enumerate(hook_map.values()):
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decl += ind(2) + f'if (hook_cnt && clz_id == {index}) {{'
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for m in methods:
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decl += ind(3) + f'HOOK_JNI({m})'
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decl += ind(2) + '}'
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decl += ind(2) + 'class_map[methods[i].name][methods[i].signature] = methods[i].fnPtr;'
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decl += ind(1) + '}'
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decl += ind(1) + 'return newMethods;'
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decl += ind(0) + '}'
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return decl
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with open('jni_hooks.hpp', 'w') as f:
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f.write('// Generated by gen_jni_hooks.py\n')
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zygote = 'com/android/internal/os/Zygote'
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methods = [fas_l, fas_o, fas_p, fas_q_alt, fas_r, fas_samsung_m, fas_samsung_n, fas_samsung_o, fas_samsung_p]
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f.write(gen_jni_def(zygote, methods))
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methods = [spec_q, spec_q_alt, spec_r, spec_samsung_q]
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f.write(gen_jni_def(zygote, methods))
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methods = [server_l, server_samsung_q]
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f.write(gen_jni_def(zygote, methods))
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f.write(gen_jni_hook())
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f.write('\n')
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