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Upgrade LSPlt

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Fix #6533
This commit is contained in:
LoveSy 2023-01-20 09:46:00 +08:00 committed by John Wu
parent cd8a2edefb
commit 0329f00129
4 changed files with 29 additions and 27 deletions
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2
native/src/external/lsplt vendored

@ -1 +1 @@
Subproject commit 1afe99bb166be7924ca529b6be6f8474902f4838
Subproject commit 772a1b168cb6feaea8e8021309f1fce942e2fa49

8
native/src/zygisk/api.hpp
View File

@ -230,7 +230,7 @@ struct Api {
// For ELFs loaded in memory matching `inode`, replace function `symbol` with `newFunc`.
// If `oldFunc` is not nullptr, the original function pointer will be saved to `oldFunc`.
void pltHookRegister(ino_t inode, const char *symbol, void *newFunc, void **oldFunc);
void pltHookRegister(dev_t dev, ino_t inode, const char *symbol, void *newFunc, void **oldFunc);
// Commit all the hooks that was previously registered.
// Returns false if an error occurred.
@ -291,7 +291,7 @@ struct api_table {
bool (*registerModule)(api_table *, module_abi *);
void (*hookJniNativeMethods)(JNIEnv *, const char *, JNINativeMethod *, int);
void (*pltHookRegister)(ino_t, const char *, void *, void **);
void (*pltHookRegister)(dev_t, ino_t, const char *, void *, void **);
bool (*exemptFd)(int);
bool (*pltHookCommit)();
int (*connectCompanion)(void * /* impl */);
@ -330,8 +330,8 @@ inline bool Api::exemptFd(int fd) {
inline void Api::hookJniNativeMethods(JNIEnv *env, const char *className, JNINativeMethod *methods, int numMethods) {
if (tbl->hookJniNativeMethods) tbl->hookJniNativeMethods(env, className, methods, numMethods);
}
inline void Api::pltHookRegister(ino_t inode, const char *symbol, void *newFunc, void **oldFunc) {
if (tbl->pltHookRegister) tbl->pltHookRegister(inode, symbol, newFunc, oldFunc);
inline void Api::pltHookRegister(dev_t dev, ino_t inode, const char *symbol, void *newFunc, void **oldFunc) {
if (tbl->pltHookRegister) tbl->pltHookRegister(dev, inode, symbol, newFunc, oldFunc);
}
inline bool Api::pltHookCommit() {
return tbl->pltHookCommit != nullptr && tbl->pltHookCommit();

44
native/src/zygisk/hook.cpp
View File

@ -107,7 +107,7 @@ struct HookContext {
#undef DCL_PRE_POST
// Global variables
vector<tuple<ino_t, const char *, void **>> *plt_hook_list;
vector<tuple<dev_t, ino_t, const char *, void **>> *plt_hook_list;
map<string, vector<JNINativeMethod>, StringCmp> *jni_hook_list;
hash_map<xstring, tree_map<xstring, tree_map<xstring, void *>>> *jni_method_map;
@ -368,10 +368,10 @@ bool ZygiskModule::RegisterModuleImpl(ApiTable *api, long *module) {
api->v2.getFlags = [](auto) { return ZygiskModule::getFlags(); };
}
if (api_version >= 4) {
api->v4.pltHookRegister = [](ino_t inode, const char *symbol, void *fn, void **backup) {
if (inode == 0 || symbol == nullptr || fn == nullptr)
api->v4.pltHookRegister = [](dev_t dev, ino_t inode, const char *symbol, void *fn, void **backup) {
if (dev == 0 || inode == 0 || symbol == nullptr || fn == nullptr)
return;
lsplt::RegisterHook(inode, symbol, fn, backup);
lsplt::RegisterHook(dev, inode, symbol, fn, backup);
};
api->v4.exemptFd = [](int fd) { return g_ctx && g_ctx->exempt_fd(fd); };
}
@ -416,7 +416,7 @@ void HookContext::plt_hook_process_regex() {
}
}
if (!ignored) {
lsplt::RegisterHook(map.inode, reg.symbol, reg.callback, reg.backup);
lsplt::RegisterHook(map.dev, map.inode, reg.symbol, reg.callback, reg.backup);
}
}
}
@ -777,19 +777,19 @@ static bool hook_commit() {
}
}
static void hook_register(ino_t inode, const char *symbol, void *new_func, void **old_func) {
if (!lsplt::RegisterHook(inode, symbol, new_func, old_func)) {
static void hook_register(dev_t dev, ino_t inode, const char *symbol, void *new_func, void **old_func) {
if (!lsplt::RegisterHook(dev, inode, symbol, new_func, old_func)) {
ZLOGE("Failed to register plt_hook \"%s\"\n", symbol);
return;
}
plt_hook_list->emplace_back(inode, symbol, old_func);
plt_hook_list->emplace_back(dev, inode, symbol, old_func);
}
#define PLT_HOOK_REGISTER_SYM(PATH_REGEX, SYM, NAME) \
hook_register(PATH_REGEX, SYM, (void*) new_##NAME, (void **) &old_##NAME)
#define PLT_HOOK_REGISTER_SYM(DEV, INODE, SYM, NAME) \
hook_register(DEV, INODE, SYM, (void*) new_##NAME, (void **) &old_##NAME)
#define PLT_HOOK_REGISTER(PATH_REGEX, NAME) \
PLT_HOOK_REGISTER_SYM(PATH_REGEX, #NAME, NAME)
#define PLT_HOOK_REGISTER(DEV, INODE, NAME) \
PLT_HOOK_REGISTER_SYM(DEV, INODE, #NAME, NAME)
void hook_functions() {
default_new(plt_hook_list);
@ -797,24 +797,26 @@ void hook_functions() {
default_new(jni_method_map);
ino_t android_runtime_inode = 0;
dev_t android_runtime_dev = 0;
for (auto &map : lsplt::MapInfo::Scan()) {
if (map.path.ends_with("libandroid_runtime.so")) {
android_runtime_inode = map.inode;
android_runtime_dev = map.dev;
break;
}
}
PLT_HOOK_REGISTER(android_runtime_inode, fork);
PLT_HOOK_REGISTER(android_runtime_inode, unshare);
PLT_HOOK_REGISTER(android_runtime_inode, jniRegisterNativeMethods);
PLT_HOOK_REGISTER(android_runtime_inode, selinux_android_setcontext);
PLT_HOOK_REGISTER_SYM(android_runtime_inode, "__android_log_close", android_log_close);
PLT_HOOK_REGISTER(android_runtime_dev, android_runtime_inode, fork);
PLT_HOOK_REGISTER(android_runtime_dev, android_runtime_inode, unshare);
PLT_HOOK_REGISTER(android_runtime_dev, android_runtime_inode, jniRegisterNativeMethods);
PLT_HOOK_REGISTER(android_runtime_dev, android_runtime_inode, selinux_android_setcontext);
PLT_HOOK_REGISTER_SYM(android_runtime_dev, android_runtime_inode, "__android_log_close", android_log_close);
hook_commit();
// Remove unhooked methods
plt_hook_list->erase(
std::remove_if(plt_hook_list->begin(), plt_hook_list->end(),
[](auto &t) { return *std::get<2>(t) == nullptr;}),
[](auto &t) { return *std::get<3>(t) == nullptr;}),
plt_hook_list->end());
if (old_jniRegisterNativeMethods == nullptr) {
@ -822,7 +824,7 @@ void hook_functions() {
struct stat self_stat{};
stat("/proc/self/exe", &self_stat);
// android::AndroidRuntime::setArgv0(const char*, bool)
PLT_HOOK_REGISTER_SYM(self_stat.st_ino, "_ZN7android14AndroidRuntime8setArgv0EPKcb", setArgv0);
PLT_HOOK_REGISTER_SYM(self_stat.st_dev, self_stat.st_ino, "_ZN7android14AndroidRuntime8setArgv0EPKcb", setArgv0);
hook_commit();
// We still need old_jniRegisterNativeMethods as other code uses it
@ -856,8 +858,8 @@ static bool unhook_functions() {
delete jni_hook_list;
// Unhook plt_hook
for (const auto &[inode, sym, old_func] : *plt_hook_list) {
if (!lsplt::RegisterHook(inode, sym, *old_func, nullptr)) {
for (const auto &[dev, inode, sym, old_func] : *plt_hook_list) {
if (!lsplt::RegisterHook(dev, inode, sym, *old_func, nullptr)) {
ZLOGE("Failed to register plt_hook [%s]\n", sym);
success = false;
}

2
native/src/zygisk/module.hpp
View File

@ -139,7 +139,7 @@ struct api_abi_v2 : public api_abi_v1 {
struct api_abi_v4 : public api_abi_base {
/* 0 */ void (*hookJniNativeMethods)(JNIEnv *, const char *, JNINativeMethod *, int);
/* 1 */ void (*pltHookRegister)(ino_t, const char *, void *, void **);
/* 1 */ void (*pltHookRegister)(dev_t, ino_t, const char *, void *, void **);
/* 2 */ bool (*exemptFd)(int);
/* 3 */ bool (*pltHookCommit)();
/* 4 */ int (*connectCompanion)(ZygiskModule *);