mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-11-24 02:25:28 +00:00
More MagiskHide optimizations
- Use a general procfs traversal function with callbacks - Much better functions for killing processes
This commit is contained in:
topjohnwu
parent
c66cabd80f
commit
4eed6794c7
@ -20,7 +20,7 @@ using namespace std;
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// Protect access to both hide_list and hide_uid
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pthread_mutex_t list_lock;
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vector<string> hide_list;
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set<uid_t> hide_uid;
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set<int> hide_uid;
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// Treat GMS separately as we're only interested in one component
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int gms_uid = -1;
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@ -37,11 +37,6 @@ static const char *prop_value[] =
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"enforcing", "0", "0", "0",
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"1", "user", "release-keys", "0", nullptr };
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struct ps_arg {
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const char *name;
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uid_t uid;
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};
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void manage_selinux() {
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char val;
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int fd = xopen(SELINUX_ENFORCE, O_RDONLY);
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@ -54,7 +49,7 @@ void manage_selinux() {
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}
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}
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void hide_sensitive_props() {
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static void hide_sensitive_props() {
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LOGI("hide_utils: Hiding sensitive props\n");
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// Hide all sensitive props
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@ -65,27 +60,32 @@ void hide_sensitive_props() {
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}
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}
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static bool is_digits(const char *s) {
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for (const char *c = s; *c; ++c) {
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if (*c < '0' || *c > '9')
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return false;
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/*
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* Bionic's atoi runs through strtol().
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* Use our own implementation for faster conversion.
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*/
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static inline int parse_int(const char *s) {
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int val = 0;
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char c;
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while ((c = *(s++))) {
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if (c > '9' || c < '0')
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return -1;
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val = val * 10 + c - '0';
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}
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return true;
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return val;
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}
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static void ps(void (*cb)(int, void*), void *arg) {
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DIR *dir;
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struct dirent *entry;
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if (!(dir = xopendir("/proc")))
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return;
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while ((entry = xreaddir(dir))) {
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if (entry->d_type == DT_DIR && is_digits(entry->d_name))
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cb(atoi(entry->d_name), arg);
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// Leave /proc fd opened as we're going to read from it repeatedly
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static DIR *procfp;
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void crawl_procfs(const function<bool (int)> &fn) {
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struct dirent *dp;
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int pid;
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rewinddir(procfp);
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while ((dp = readdir(procfp))) {
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pid = parse_int(dp->d_name);
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if (pid > 0 && !fn(pid))
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break;
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}
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closedir(dir);
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}
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static bool proc_name_match(int pid, const char *name) {
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@ -94,24 +94,24 @@ static bool proc_name_match(int pid, const char *name) {
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sprintf(buf, "/proc/%d/comm", pid);
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if ((f = fopen(buf, "re"))) {
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fgets(buf, sizeof(buf), f);
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fclose(f);
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if (strcmp(buf, name) == 0)
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return true;
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} else {
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// The PID is already killed
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return false;
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}
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fclose(f);
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sprintf(buf, "/proc/%d/cmdline", pid);
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if ((f = fopen(buf, "re"))) {
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fgets(buf, sizeof(buf), f);
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fclose(f);
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if (strcmp(basename(buf), name) == 0)
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return true;
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} else {
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// The PID is already killed
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return false;
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}
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fclose(f);
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sprintf(buf, "/proc/%d/exe", pid);
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ssize_t len;
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@ -121,52 +121,38 @@ static bool proc_name_match(int pid, const char *name) {
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return strcmp(basename(buf), name) == 0;
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}
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static void kill_proc_cb(int pid, void *v) {
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auto args = static_cast<ps_arg *>(v);
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if (proc_name_match(pid, args->name))
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kill(pid, SIGTERM);
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else if (args->uid > 0) {
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char buf[64];
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struct stat st;
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sprintf(buf, "/proc/%d", pid);
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stat(buf, &st);
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if (args->uid == st.st_uid)
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kill(pid, SIGTERM);
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}
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}
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static void kill_process(const char *name) {
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ps_arg args;
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char *slash = nullptr;
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if (strcmp(name, SAFETYNET_COMPONENT) == 0) {
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// We do NOT want to kill gms, it will cause massive system crashes
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args.name = SAFETYNET_PROCESS;
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} else {
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// Only leave the package name part of component name temporarily
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slash = strchr((char *)name, '/');
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if (slash)
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*slash = '\0';
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args.name = name;
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}
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struct stat st;
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int fd = xopen("/data/data", O_RDONLY | O_CLOEXEC);
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if (fstatat(fd, args.name, &st, 0) == 0)
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args.uid = st.st_uid;
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else
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args.uid = 0;
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close(fd);
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ps(kill_proc_cb, &args);
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// Revert back to component name
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if (slash)
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*slash = '/';
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// We do NOT want to kill GMS itself
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if (strcmp(name, SAFETYNET_PKG) == 0)
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name = SAFETYNET_PROCESS;
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crawl_procfs([=](int pid) -> bool {
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if (proc_name_match(pid, name)) {
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if (kill(pid, SIGTERM) == 0)
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LOGD("hide_utils: killed PID=[%d] (%s)\n", pid, name);
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return false;
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}
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return true;
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});
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}
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static int add_pkg_uid(const char *proc) {
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static void kill_process(int uid) {
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// We do NOT want to kill all GMS processes
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if (uid == gms_uid) {
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kill_process(SAFETYNET_PROCESS);
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return;
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}
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crawl_procfs([=](int pid) -> bool {
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if (get_uid(pid) == uid && kill(pid, SIGTERM) == 0)
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LOGD("hide_utils: killed PID=[%d]\n", pid);
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return true;
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});
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}
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static int add_pkg_uid(const char *pkg) {
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char path[4096];
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struct stat st;
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const char *data = SDK_INT >= 24 ? "/data/user_de/0" : "/data/data";
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sprintf(path, "%s/%s", data, proc);
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sprintf(path, "%s/%s", data, pkg);
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if (xstat(path, &st) == 0) {
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hide_uid.insert(st.st_uid);
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return st.st_uid;
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@ -181,53 +167,52 @@ void refresh_uid() {
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}
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void clean_magisk_props() {
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LOGD("hide_utils: Cleaning magisk props\n");
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getprop([](const char *name, auto, auto) -> void {
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if (strstr(name, "magisk"))
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deleteprop(name);
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}, nullptr, false);
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}
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int add_list(const char *proc) {
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int add_list(const char *pkg) {
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for (auto &s : hide_list) {
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if (s == proc)
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if (s == pkg)
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return HIDE_ITEM_EXIST;
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}
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// Add to database
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char sql[4096];
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snprintf(sql, sizeof(sql), "INSERT INTO hidelist (process) VALUES('%s')", proc);
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snprintf(sql, sizeof(sql), "INSERT INTO hidelist (process) VALUES('%s')", pkg);
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char *err = db_exec(sql);
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db_err_cmd(err, return DAEMON_ERROR);
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LOGI("hide_list add: [%s]\n", proc);
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LOGI("hide_list add: [%s]\n", pkg);
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// Critical region
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pthread_mutex_lock(&list_lock);
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hide_list.emplace_back(proc);
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add_pkg_uid(proc);
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hide_list.emplace_back(pkg);
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int uid = add_pkg_uid(pkg);
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pthread_mutex_unlock(&list_lock);
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kill_process(proc);
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kill_process(uid);
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return DAEMON_SUCCESS;
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}
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int add_list(int client) {
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char *proc = read_string(client);
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int ret = add_list(proc);
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free(proc);
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char *pkg = read_string(client);
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int ret = add_list(pkg);
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free(pkg);
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update_inotify_mask();
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return ret;
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}
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static int rm_list(const char *proc) {
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static int rm_list(const char *pkg) {
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// Critical region
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bool remove = false;
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pthread_mutex_lock(&list_lock);
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for (auto it = hide_list.begin(); it != hide_list.end(); ++it) {
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if (*it == proc) {
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if (*it == pkg) {
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remove = true;
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LOGI("hide_list rm: [%s]\n", proc);
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LOGI("hide_list rm: [%s]\n", pkg);
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hide_list.erase(it);
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break;
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}
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@ -238,7 +223,7 @@ static int rm_list(const char *proc) {
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if (remove) {
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char sql[4096];
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snprintf(sql, sizeof(sql), "DELETE FROM hidelist WHERE process='%s'", proc);
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snprintf(sql, sizeof(sql), "DELETE FROM hidelist WHERE process='%s'", pkg);
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char *err = db_exec(sql);
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db_err(err);
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return DAEMON_SUCCESS;
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@ -248,14 +233,14 @@ static int rm_list(const char *proc) {
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}
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int rm_list(int client) {
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char *proc = read_string(client);
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int ret = rm_list(proc);
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free(proc);
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char *pkg = read_string(client);
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int ret = rm_list(pkg);
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free(pkg);
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update_inotify_mask();
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return ret;
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}
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int init_list(void *, int, char **data, char**) {
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static int init_list(void *, int, char **data, char**) {
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LOGI("hide_list init: [%s]\n", *data);
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hide_list.emplace_back(*data);
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kill_process(*data);
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@ -265,8 +250,8 @@ int init_list(void *, int, char **data, char**) {
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return 0;
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}
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void init_list(const char *proc) {
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init_list(nullptr, 0, (char **) &proc, nullptr);
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static void init_list(const char *pkg) {
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init_list(nullptr, 0, (char **) &pkg, nullptr);
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}
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#define LEGACY_LIST MODULEROOT "/.core/hidelist"
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@ -311,17 +296,36 @@ static void set_hide_config() {
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db_err(err);
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}
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int launch_magiskhide(int client) {
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static inline void launch_err(int client, int code = DAEMON_ERROR) {
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if (code == DAEMON_ERROR)
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hide_enabled = false;
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if (client >= 0) {
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write_int(client, code);
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close(client);
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}
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pthread_exit(nullptr);
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}
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#define LAUNCH_ERR launch_err(client)
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void launch_magiskhide(int client) {
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if (SDK_INT < 19)
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goto error;
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LAUNCH_ERR;
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if (hide_enabled)
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return HIDE_IS_ENABLED;
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launch_err(client, HIDE_IS_ENABLED);
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hide_enabled = true;
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set_hide_config();
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LOGI("* Starting MagiskHide\n");
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if (procfp == nullptr) {
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int fd = xopen("/proc", O_RDONLY | O_CLOEXEC);
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if (fd < 0)
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LAUNCH_ERR;
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procfp = fdopendir(fd);
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}
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hide_sensitive_props();
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// Initialize the mutex lock
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@ -329,20 +333,20 @@ int launch_magiskhide(int client) {
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// Initialize the hide list
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if (!init_list())
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goto error;
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LAUNCH_ERR;
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// Get thread reference
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proc_monitor_thread = pthread_self();
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if (client >= 0) {
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write_int(client, DAEMON_SUCCESS);
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close(client);
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client = -1;
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}
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// Start monitoring
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proc_monitor();
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error:
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hide_enabled = false;
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return DAEMON_ERROR;
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// proc_monitor should not return
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LAUNCH_ERR;
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}
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int stop_magiskhide() {
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@ -52,8 +52,8 @@ void magiskhide_handler(int client) {
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switch (req) {
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case LAUNCH_MAGISKHIDE:
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res = launch_magiskhide(client);
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break;
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launch_magiskhide(client);
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return;
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case STOP_MAGISKHIDE:
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res = stop_magiskhide();
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break;
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@ -2,9 +2,13 @@
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#define MAGISK_HIDE_H
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#include <pthread.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <vector>
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#include <string>
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#include <set>
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#include <functional>
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#include "daemon.h"
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@ -15,7 +19,7 @@
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#define SAFETYNET_PKG "com.google.android.gms"
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// Daemon entries
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int launch_magiskhide(int client);
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void launch_magiskhide(int client);
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int stop_magiskhide();
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int add_list(int client);
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int rm_list(int client);
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@ -29,14 +33,26 @@ void proc_monitor();
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// Utility functions
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void manage_selinux();
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void hide_sensitive_props();
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void clean_magisk_props();
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void refresh_uid();
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void crawl_procfs(const std::function<bool (int)> &fn);
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static inline int get_uid(const int pid) {
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char path[16];
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struct stat st;
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sprintf(path, "/proc/%d", pid);
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if (stat(path, &st) == -1)
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return -1;
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// We don't care about multiuser
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return st.st_uid % 100000;
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}
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extern bool hide_enabled;
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extern pthread_mutex_t list_lock;
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extern std::vector<std::string> hide_list;
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extern std::set<uid_t> hide_uid;
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extern std::set<int> hide_uid;
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extern int gms_uid;
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enum {
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@ -11,7 +11,6 @@
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <pthread.h>
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@ -21,7 +20,7 @@
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#include <sys/mount.h>
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#include <vector>
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#include <string>
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#include <unordered_map>
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#include <map>
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#include <magisk.h>
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#include <utils.h>
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@ -62,6 +61,9 @@ static inline void lazy_unmount(const char* mountpoint) {
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LOGD("hide_daemon: Unmounted (%s)\n", mountpoint);
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}
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/* APK monitoring doesn't seem to require checking namespace
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* separation from PPID. Preserve this function just in case */
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#if 0
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static inline int parse_ppid(const int pid) {
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char path[32];
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int ppid;
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@ -77,17 +79,7 @@ static inline int parse_ppid(const int pid) {
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return ppid;
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}
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static inline uid_t get_uid(const int pid) {
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char path[16];
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struct stat st;
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sprintf(path, "/proc/%d", pid);
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if (stat(path, &st) == -1)
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return -1;
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return st.st_uid;
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}
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#endif
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static bool is_pid_safetynet_process(const int pid) {
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char path[32];
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@ -109,7 +101,7 @@ static bool is_pid_safetynet_process(const int pid) {
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}
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static void hide_daemon(int pid) {
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LOGD("hide_daemon: handling pid=[%d]\n", pid);
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LOGD("hide_daemon: handling PID=[%d]\n", pid);
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char buffer[4096];
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vector<string> mounts;
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@ -151,80 +143,49 @@ exit:
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_exit(0);
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}
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/*
|
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* Bionic's atoi runs through strtol() and fault-tolerence checkings.
|
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* Since we don't need it, use our own implementation of atoi()
|
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* for faster conversion.
|
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*/
|
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static inline int fast_atoi(const char *str) {
|
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int val = 0;
|
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// A mapping from pid to namespace inode to avoid time-consuming GC
|
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static map<int, uint64_t> pid_ns_map;
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while (*str)
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val = val * 10 + (*str++ - '0');
|
||||
static bool process_pid(int pid) {
|
||||
// We're only interested in PIDs > 1000
|
||||
if (pid <= 1000)
|
||||
return true;
|
||||
|
||||
return val;
|
||||
}
|
||||
struct stat ns;
|
||||
int uid = get_uid(pid);
|
||||
if (hide_uid.count(uid)) {
|
||||
// Make sure we can read mount namespace
|
||||
if (read_ns(pid, &ns))
|
||||
return true;
|
||||
|
||||
// Leave /proc fd opened as we're going to read from it repeatedly
|
||||
static DIR *dfd;
|
||||
// Use unordered map with pid and namespace inode number to avoid time-consuming GC
|
||||
static unordered_map<int, uint64_t> pid_ns_map;
|
||||
// Check if it's a process we haven't already hijacked
|
||||
auto pos = pid_ns_map.find(pid);
|
||||
if (pos != pid_ns_map.end() && pos->second == ns.st_ino)
|
||||
return true;
|
||||
|
||||
static void detect_new_processes() {
|
||||
struct dirent *dp;
|
||||
struct stat ns, pns;
|
||||
int pid, ppid;
|
||||
uid_t uid;
|
||||
if (uid == gms_uid) {
|
||||
// Check /proc/uid/cmdline to see if it's SAFETYNET_PROCESS
|
||||
if (!is_pid_safetynet_process(pid))
|
||||
return true;
|
||||
|
||||
// Iterate through /proc and get a process that reads the target APK
|
||||
rewinddir(dfd);
|
||||
pthread_mutex_lock(&list_lock);
|
||||
while ((dp = readdir(dfd))) {
|
||||
if (!isdigit(dp->d_name[0]))
|
||||
continue;
|
||||
|
||||
// dp->d_name is now the pid
|
||||
pid = fast_atoi(dp->d_name);
|
||||
|
||||
// We're only interested in PIDs > 1000
|
||||
if (pid <= 1000)
|
||||
continue;
|
||||
|
||||
uid = get_uid(pid) % 100000; // Handle multiuser
|
||||
bool is_target = hide_uid.count(uid) != 0;
|
||||
if (is_target) {
|
||||
// Make sure our target is alive
|
||||
if ((ppid = parse_ppid(pid)) < 0 || read_ns(ppid, &pns) || read_ns(pid, &ns))
|
||||
continue;
|
||||
|
||||
// Check if it's a process we haven't already hijacked
|
||||
auto pos = pid_ns_map.find(pid);
|
||||
if (pos == pid_ns_map.end() || pos->second != ns.st_ino) {
|
||||
pid_ns_map[pid] = ns.st_ino;
|
||||
if (uid == gms_uid) {
|
||||
// Check /proc/uid/cmdline to see if it's SAFETYNET_PROCESS
|
||||
if (!is_pid_safetynet_process(pid))
|
||||
continue;
|
||||
|
||||
LOGI("proc_monitor: found %s\n", SAFETYNET_PROCESS);
|
||||
}
|
||||
|
||||
// Send pause signal ASAP
|
||||
if (kill(pid, SIGSTOP) == -1)
|
||||
continue;
|
||||
|
||||
/*
|
||||
* The setns system call do not support multithread processes
|
||||
* We have to fork a new process, setns, then do the unmounts
|
||||
*/
|
||||
LOGI("proc_monitor: UID=[%ju] PID=[%d] ns=[%llu]\n",
|
||||
(uintmax_t)uid, pid, ns.st_ino);
|
||||
if (fork_dont_care() == 0)
|
||||
hide_daemon(pid);
|
||||
}
|
||||
LOGD("proc_monitor: " SAFETYNET_PROCESS "\n");
|
||||
}
|
||||
|
||||
// Send pause signal ASAP
|
||||
if (kill(pid, SIGSTOP) == -1)
|
||||
return true;
|
||||
|
||||
pid_ns_map[pid] = ns.st_ino;
|
||||
LOGI("proc_monitor: UID=[%d] PID=[%d] ns=[%llu]\n", uid, pid, ns.st_ino);
|
||||
|
||||
/*
|
||||
* The setns system call do not support multithread processes
|
||||
* We have to fork a new process, setns, then do the unmounts
|
||||
*/
|
||||
if (fork_dont_care() == 0)
|
||||
hide_daemon(pid);
|
||||
}
|
||||
pthread_mutex_unlock(&list_lock);
|
||||
return true;
|
||||
}
|
||||
|
||||
static void listdir_apk(const char *name) {
|
||||
@ -310,14 +271,6 @@ void proc_monitor() {
|
||||
term_thread(TERM_THREAD);
|
||||
}
|
||||
|
||||
if ((dfd = opendir("/proc")) == NULL) {
|
||||
LOGE("proc_monitor: Unable to open /proc\n");
|
||||
term_thread(TERM_THREAD);
|
||||
}
|
||||
|
||||
// Detect existing processes for the first time
|
||||
detect_new_processes();
|
||||
|
||||
// Read inotify events
|
||||
struct inotify_event *event;
|
||||
ssize_t len;
|
||||
@ -337,8 +290,9 @@ void proc_monitor() {
|
||||
if (event->mask & IN_OPEN) {
|
||||
// Since we're just watching files,
|
||||
// extracting file name is not possible from querying event
|
||||
// LOGI("proc_monitor: inotify: APK opened\n");
|
||||
detect_new_processes();
|
||||
pthread_mutex_lock(&list_lock);
|
||||
crawl_procfs(process_pid);
|
||||
pthread_mutex_unlock(&list_lock);
|
||||
} else {
|
||||
LOGI("proc_monitor: inotify: /data/app change detected\n");
|
||||
pthread_mutex_lock(&list_lock);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user