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Track app ID instead of UID

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topjohnwu 2021-09-20 05:08:25 -07:00
parent f1b6c9f4aa
commit 4f0bced53e
1 changed files with 53 additions and 39 deletions
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92
native/jni/zygisk/deny/utils.cpp
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@ -14,8 +14,8 @@
using namespace std;
static set<pair<string, string>> *deny_set; /* set of <pkg, process> pair */
static map<int, vector<string_view>> *uid_proc_map; /* uid -> list of process */
static set<pair<string, string>> *deny_set; /* set of <pkg, process> pair */
static map<int, vector<string_view>> *app_id_proc_map; /* app ID -> list of process */
static int inotify_fd = -1;
// Locks the variables above
@ -23,32 +23,45 @@ static pthread_mutex_t data_lock = PTHREAD_MUTEX_INITIALIZER;
atomic<bool> denylist_enabled = false;
static void rebuild_uid_map() {
uid_proc_map->clear();
static void rebuild_map() {
app_id_proc_map->clear();
string data_path(APP_DATA_DIR);
size_t len = data_path.length();
auto dir = open_dir(APP_DATA_DIR);
bool first_iter = true;
for (dirent *entry; (entry = xreaddir(dir.get()));) {
data_path.resize(len);
data_path += '/';
data_path += entry->d_name; // multiuser user id
data_path += '/';
size_t user_len = data_path.length();
struct stat st;
for (const auto &hide : *deny_set) {
if (hide.first == ISOLATED_MAGIC) {
if (!first_iter) continue;
// Setup isolated processes
(*uid_proc_map)[-1].emplace_back(hide.second);
}
data_path.resize(user_len);
data_path += hide.first;
if (stat(data_path.data(), &st))
continue;
(*uid_proc_map)[st.st_uid].emplace_back(hide.second);
// Collect all user IDs
vector<string> users;
if (auto dir = open_dir(APP_DATA_DIR)) {
for (dirent *entry; (entry = xreaddir(dir.get()));) {
users.emplace_back(entry->d_name);
}
} else {
return;
}
string_view prev_pkg;
struct stat st;
for (const auto &target : *deny_set) {
if (target.first == ISOLATED_MAGIC) {
// Isolated process
(*app_id_proc_map)[-1].emplace_back(target.second);
} else if (prev_pkg == target.first) {
// Optimize the case when it's the same package as previous iteration
(*app_id_proc_map)[to_app_id(st.st_uid)].emplace_back(target.second);
} else {
// Traverse the filesystem to find app ID
for (const auto &user_id : users) {
data_path.resize(len);
data_path += '/';
data_path += user_id;
data_path += '/';
data_path += target.first;
if (stat(data_path.data(), &st) == 0) {
prev_pkg = target.first;
(*app_id_proc_map)[to_app_id(st.st_uid)].emplace_back(target.second);
break;
}
}
}
first_iter = false;
}
}
@ -154,7 +167,7 @@ static int add_list(const char *pkg, const char *proc) {
if (hide.first == pkg && hide.second == proc)
return DENYLIST_ITEM_EXIST;
add_hide_set(pkg, proc);
rebuild_uid_map();
rebuild_map();
}
// Add to database
@ -187,7 +200,7 @@ static int rm_list(const char *pkg, const char *proc) {
}
if (!remove)
return DENYLIST_ITEM_NOT_EXIST;
rebuild_uid_map();
rebuild_map();
}
char sql[4096];
@ -265,7 +278,7 @@ static void inotify_handler(pollfd *pfd) {
if (u.event.name == "packages.xml"sv) {
exec_task([] {
mutex_guard lock(data_lock);
rebuild_uid_map();
rebuild_map();
});
}
}
@ -295,8 +308,8 @@ int enable_deny() {
denylist_enabled = true;
default_new(uid_proc_map);
rebuild_uid_map();
default_new(app_id_proc_map);
rebuild_map();
inotify_fd = xinotify_init1(IN_CLOEXEC);
if (inotify_fd >= 0) {
@ -317,9 +330,9 @@ int disable_deny() {
LOGI("* Disable DenyList\n");
mutex_guard lock(data_lock);
delete uid_proc_map;
delete app_id_proc_map;
delete deny_set;
uid_proc_map = nullptr;
app_id_proc_map = nullptr;
deny_set = nullptr;
unregister_poll(inotify_fd, true);
inotify_fd = -1;
@ -340,22 +353,23 @@ void initialize_denylist() {
bool is_deny_target(int uid, string_view process) {
mutex_guard lock(data_lock);
if (uid % 100000 >= 90000) {
int app_id = to_app_id(uid);
if (app_id >= 90000) {
// Isolated processes
auto it = uid_proc_map->find(-1);
if (it == uid_proc_map->end())
auto it = app_id_proc_map->find(-1);
if (it == app_id_proc_map->end())
return false;
for (auto &s : it->second) {
for (const auto &s : it->second) {
if (str_starts(process, s))
return true;
}
} else {
auto it = uid_proc_map->find(uid);
if (it == uid_proc_map->end())
auto it = app_id_proc_map->find(app_id);
if (it == app_id_proc_map->end())
return false;
for (auto &s : it->second) {
for (const auto &s : it->second) {
if (s == process)
return true;
}