kernel: Added legacy throne tracker support, using packages.list to scan application UIDs
This commit is contained in:
ShirkNeko
609
kernel/throne_tracker_legacy.c
Normal file
609
kernel/throne_tracker_legacy.c
Normal file
@@ -0,0 +1,609 @@
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#include <linux/err.h>
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#include <linux/fs.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/version.h>
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#include "allowlist.h"
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#include "klog.h" // IWYU pragma: keep
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#include "ksu.h"
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#include "manager.h"
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#include "throne_tracker.h"
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#include "kernel_compat.h"
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#include "dynamic_manager.h"
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#include "throne_comm.h"
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uid_t ksu_manager_uid = KSU_INVALID_UID;
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#define SYSTEM_PACKAGES_LIST_PATH "/data/system/packages.list.tmp"
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#define KSU_UID_LIST_PATH "/data/misc/user_uid/uid_list"
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struct uid_data {
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struct list_head list;
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u32 uid;
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char package[KSU_MAX_PACKAGE_NAME];
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};
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// Try read whitelist first, fallback if failed
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static int read_uid_whitelist(struct list_head *uid_list)
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{
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struct file *fp;
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char *file_content = NULL;
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char *line, *next_line;
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loff_t file_size;
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loff_t pos = 0;
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int count = 0;
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ssize_t bytes_read;
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fp = ksu_filp_open_compat(KSU_UID_LIST_PATH, O_RDONLY, 0);
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if (IS_ERR(fp)) {
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pr_info("whitelist not found, fallback needed\n");
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return -ENOENT;
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}
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file_size = fp->f_inode->i_size;
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if (file_size <= 0) {
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pr_info("whitelist file is empty\n");
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filp_close(fp, NULL);
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return -ENODATA;
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}
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file_content = kzalloc(file_size + 1, GFP_ATOMIC);
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if (!file_content) {
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pr_err("failed to allocate memory for whitelist file (%lld bytes)\n", file_size);
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filp_close(fp, NULL);
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return -ENOMEM;
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}
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bytes_read = ksu_kernel_read_compat(fp, file_content, file_size, &pos);
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if (bytes_read != file_size) {
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pr_err("failed to read whitelist file: read %zd bytes, expected %lld bytes\n",
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bytes_read, file_size);
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kfree(file_content);
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filp_close(fp, NULL);
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return -EIO;
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}
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file_content[file_size] = '\0';
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filp_close(fp, NULL);
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pr_info("successfully read whitelist file (%lld bytes), parsing lines...\n", file_size);
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line = file_content;
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while (line && *line) {
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next_line = strchr(line, '\n');
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if (next_line) {
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*next_line = '\0';
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next_line++;
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}
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char *trimmed_line = line;
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while (*trimmed_line == ' ' || *trimmed_line == '\t' || *trimmed_line == '\r') {
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trimmed_line++;
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}
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if (strlen(trimmed_line) > 0) {
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char *line_copy = trimmed_line;
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char *uid_str = strsep(&line_copy, " \t");
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char *package_name = line_copy;
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if (package_name) {
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while (*package_name == ' ' || *package_name == '\t') {
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package_name++;
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}
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}
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if (uid_str && package_name && strlen(package_name) > 0) {
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u32 uid;
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if (!kstrtou32(uid_str, 10, &uid)) {
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struct uid_data *data = kzalloc(sizeof(struct uid_data), GFP_ATOMIC);
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if (data) {
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data->uid = uid;
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size_t pkg_len = strlen(package_name);
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size_t copy_len = min(pkg_len, (size_t)(KSU_MAX_PACKAGE_NAME - 1));
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strncpy(data->package, package_name, copy_len);
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data->package[copy_len] = '\0';
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list_add_tail(&data->list, uid_list);
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count++;
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if (count % 100 == 0) {
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pr_info("parsed %d packages so far...\n", count);
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}
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} else {
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pr_err("failed to allocate memory for uid_data\n");
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}
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} else {
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pr_warn("invalid uid format in line: %s\n", trimmed_line);
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}
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} else {
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pr_warn("invalid line format: %s\n", trimmed_line);
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}
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}
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line = next_line;
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}
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kfree(file_content);
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pr_info("successfully loaded %d uids from whitelist\n", count);
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return count > 0 ? 0 : -ENODATA;
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}
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static int get_pkg_from_apk_path(char *pkg, const char *path)
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{
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int len = strlen(path);
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if (len >= KSU_MAX_PACKAGE_NAME || len < 1)
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return -1;
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const char *last_slash = NULL;
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const char *second_last_slash = NULL;
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int i;
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for (i = len - 1; i >= 0; i--) {
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if (path[i] == '/') {
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if (!last_slash) {
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last_slash = &path[i];
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} else {
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second_last_slash = &path[i];
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break;
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}
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}
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}
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if (!last_slash || !second_last_slash)
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return -1;
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const char *last_hyphen = strchr(second_last_slash, '-');
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if (!last_hyphen || last_hyphen > last_slash)
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return -1;
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int pkg_len = last_hyphen - second_last_slash - 1;
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if (pkg_len >= KSU_MAX_PACKAGE_NAME || pkg_len <= 0)
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return -1;
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// Copying the package name
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strncpy(pkg, second_last_slash + 1, pkg_len);
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pkg[pkg_len] = '\0';
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return 0;
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}
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static void crown_manager(const char *apk, struct list_head *uid_data,
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int signature_index)
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{
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char pkg[KSU_MAX_PACKAGE_NAME];
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if (get_pkg_from_apk_path(pkg, apk) < 0) {
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pr_err("Failed to get package name from apk path: %s\n", apk);
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return;
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}
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pr_info("manager pkg: %s, signature_index: %d\n", pkg, signature_index);
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#ifdef KSU_MANAGER_PACKAGE
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// pkg is `/<real package>`
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if (strncmp(pkg, KSU_MANAGER_PACKAGE, sizeof(KSU_MANAGER_PACKAGE))) {
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pr_info("manager package is inconsistent with kernel build: %s\n",
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KSU_MANAGER_PACKAGE);
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return;
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}
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#endif
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struct list_head *list = (struct list_head *)uid_data;
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struct uid_data *np;
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list_for_each_entry(np, list, list) {
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if (strncmp(np->package, pkg, KSU_MAX_PACKAGE_NAME) == 0) {
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pr_info("Crowning manager: %s(uid=%d, signature_index=%d)\n",
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pkg, np->uid, signature_index);
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// Dynamic Sign index (1) or multi-manager signatures (2+)
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if (signature_index == DYNAMIC_SIGN_INDEX || signature_index >= 2) {
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ksu_add_manager(np->uid, signature_index);
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if (!ksu_is_manager_uid_valid()) {
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ksu_set_manager_uid(np->uid);
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}
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} else {
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ksu_set_manager_uid(np->uid);
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}
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break;
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}
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}
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}
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#define DATA_PATH_LEN 384 // 384 is enough for /data/app/<package>/base.apk
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struct data_path {
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char dirpath[DATA_PATH_LEN];
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int depth;
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struct list_head list;
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};
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struct apk_path_hash {
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unsigned int hash;
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bool exists;
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struct list_head list;
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};
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static struct list_head apk_path_hash_list;
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struct my_dir_context {
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struct dir_context ctx;
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struct list_head *data_path_list;
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char *parent_dir;
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void *private_data;
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int depth;
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int *stop;
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};
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// https://docs.kernel.org/filesystems/porting.html
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// filldir_t (readdir callbacks) calling conventions have changed. Instead of returning 0 or -E... it returns bool now. false means "no more" (as -E... used to) and true - "keep going" (as 0 in old calling conventions). Rationale: callers never looked at specific -E... values anyway. -> iterate_shared() instances require no changes at all, all filldir_t ones in the tree converted.
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 1, 0)
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#define FILLDIR_RETURN_TYPE bool
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#define FILLDIR_ACTOR_CONTINUE true
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#define FILLDIR_ACTOR_STOP false
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#else
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#define FILLDIR_RETURN_TYPE int
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#define FILLDIR_ACTOR_CONTINUE 0
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#define FILLDIR_ACTOR_STOP -EINVAL
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#endif
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FILLDIR_RETURN_TYPE my_actor(struct dir_context *ctx, const char *name,
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int namelen, loff_t off, u64 ino,
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unsigned int d_type)
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{
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struct my_dir_context *my_ctx =
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container_of(ctx, struct my_dir_context, ctx);
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char dirpath[DATA_PATH_LEN];
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if (!my_ctx) {
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pr_err("Invalid context\n");
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return FILLDIR_ACTOR_STOP;
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}
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if (my_ctx->stop && *my_ctx->stop) {
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pr_info("Stop searching\n");
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return FILLDIR_ACTOR_STOP;
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}
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if (!strncmp(name, "..", namelen) || !strncmp(name, ".", namelen))
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return FILLDIR_ACTOR_CONTINUE; // Skip "." and ".."
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if (d_type == DT_DIR && namelen >= 8 && !strncmp(name, "vmdl", 4) &&
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!strncmp(name + namelen - 4, ".tmp", 4)) {
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pr_info("Skipping directory: %.*s\n", namelen, name);
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return FILLDIR_ACTOR_CONTINUE; // Skip staging package
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}
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if (snprintf(dirpath, DATA_PATH_LEN, "%s/%.*s", my_ctx->parent_dir,
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namelen, name) >= DATA_PATH_LEN) {
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pr_err("Path too long: %s/%.*s\n", my_ctx->parent_dir, namelen,
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name);
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return FILLDIR_ACTOR_CONTINUE;
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}
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if (d_type == DT_DIR && my_ctx->depth > 0 &&
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(my_ctx->stop && !*my_ctx->stop)) {
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struct data_path *data =
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kmalloc(sizeof(struct data_path), GFP_ATOMIC);
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if (!data) {
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pr_err("Failed to allocate memory for %s\n", dirpath);
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return FILLDIR_ACTOR_CONTINUE;
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}
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strscpy(data->dirpath, dirpath, DATA_PATH_LEN);
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data->depth = my_ctx->depth - 1;
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list_add_tail(&data->list, my_ctx->data_path_list);
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} else {
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if ((namelen == 8) &&
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(strncmp(name, "base.apk", namelen) == 0)) {
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struct apk_path_hash *pos, *n;
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0)
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unsigned int hash =
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full_name_hash(dirpath, strlen(dirpath));
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#else
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unsigned int hash =
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full_name_hash(NULL, dirpath, strlen(dirpath));
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#endif
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list_for_each_entry(pos, &apk_path_hash_list, list) {
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if (hash == pos->hash) {
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pos->exists = true;
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return FILLDIR_ACTOR_CONTINUE;
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}
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}
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int signature_index = -1;
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bool is_multi_manager = is_dynamic_manager_apk(
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dirpath, &signature_index);
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pr_info("Found new base.apk at path: %s, is_multi_manager: %d, signature_index: %d\n",
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dirpath, is_multi_manager, signature_index);
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// Check for dynamic sign or multi-manager signatures
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if (is_multi_manager &&
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(signature_index == DYNAMIC_SIGN_INDEX || signature_index >= 2)) {
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crown_manager(dirpath, my_ctx->private_data,
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signature_index);
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struct apk_path_hash *apk_data =
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kmalloc(sizeof(struct apk_path_hash),
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GFP_ATOMIC);
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if (apk_data) {
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apk_data->hash = hash;
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apk_data->exists = true;
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list_add_tail(&apk_data->list,
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&apk_path_hash_list);
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}
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} else if (is_manager_apk(dirpath)) {
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crown_manager(dirpath, my_ctx->private_data, 0);
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*my_ctx->stop = 1;
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// Manager found, clear APK cache list
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list_for_each_entry_safe(
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pos, n, &apk_path_hash_list, list) {
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list_del(&pos->list);
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kfree(pos);
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}
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} else {
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struct apk_path_hash *apk_data =
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kmalloc(sizeof(struct apk_path_hash),
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GFP_ATOMIC);
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if (apk_data) {
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apk_data->hash = hash;
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apk_data->exists = true;
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list_add_tail(&apk_data->list,
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&apk_path_hash_list);
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}
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}
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}
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}
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return FILLDIR_ACTOR_CONTINUE;
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}
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void search_manager(const char *path, int depth, struct list_head *uid_data)
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{
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int i, stop = 0;
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struct list_head data_path_list;
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INIT_LIST_HEAD(&data_path_list);
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INIT_LIST_HEAD(&apk_path_hash_list);
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unsigned long data_app_magic = 0;
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// Initialize APK cache list
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struct apk_path_hash *pos, *n;
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list_for_each_entry(pos, &apk_path_hash_list, list) {
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pos->exists = false;
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}
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// First depth
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struct data_path data;
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strscpy(data.dirpath, path, DATA_PATH_LEN);
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data.depth = depth;
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list_add_tail(&data.list, &data_path_list);
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for (i = depth; i >= 0; i--) {
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struct data_path *pos, *n;
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list_for_each_entry_safe(pos, n, &data_path_list, list) {
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struct my_dir_context ctx = {
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.ctx.actor = my_actor,
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.data_path_list = &data_path_list,
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.parent_dir = pos->dirpath,
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.private_data = uid_data,
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.depth = pos->depth,
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.stop = &stop
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};
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struct file *file;
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if (!stop) {
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file = ksu_filp_open_compat(
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pos->dirpath, O_RDONLY | O_NOFOLLOW, 0);
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if (IS_ERR(file)) {
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pr_err("Failed to open directory: %s, err: %ld\n",
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pos->dirpath, PTR_ERR(file));
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goto skip_iterate;
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}
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// grab magic on first folder, which is /data/app
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if (!data_app_magic) {
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if (file->f_inode->i_sb->s_magic) {
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data_app_magic =
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file->f_inode->i_sb
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->s_magic;
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pr_info("%s: dir: %s got magic! 0x%lx\n",
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__func__, pos->dirpath,
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data_app_magic);
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} else {
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filp_close(file, NULL);
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goto skip_iterate;
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}
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}
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if (file->f_inode->i_sb->s_magic !=
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data_app_magic) {
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pr_info("%s: skip: %s magic: 0x%lx expected: 0x%lx\n",
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__func__, pos->dirpath,
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file->f_inode->i_sb->s_magic,
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data_app_magic);
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filp_close(file, NULL);
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goto skip_iterate;
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}
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iterate_dir(file, &ctx.ctx);
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filp_close(file, NULL);
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}
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skip_iterate:
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list_del(&pos->list);
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if (pos != &data)
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kfree(pos);
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}
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}
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// clear apk_path_hash_list unconditionally
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pr_info("search manager: cleanup!\n");
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list_for_each_entry_safe(pos, n, &apk_path_hash_list, list) {
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list_del(&pos->list);
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kfree(pos);
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}
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}
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static bool is_uid_exist(uid_t uid, char *package, void *data)
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{
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struct list_head *list = (struct list_head *)data;
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struct uid_data *np;
|
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bool exist = false;
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list_for_each_entry(np, list, list) {
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if (np->uid == uid % 100000 &&
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strncmp(np->package, package, KSU_MAX_PACKAGE_NAME) == 0) {
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exist = true;
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break;
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}
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}
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return exist;
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}
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void track_throne(void)
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{
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struct list_head uid_list;
|
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INIT_LIST_HEAD(&uid_list);
|
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|
||||
pr_info("track_throne triggered, attempting whitelist read\n");
|
||||
|
||||
// Try read whitelist first
|
||||
int ret = read_uid_whitelist(&uid_list);
|
||||
|
||||
if (ret < 0) {
|
||||
pr_info("whitelist read failed (%d), request userspace scan\n", ret);
|
||||
|
||||
// Request userspace to rescan
|
||||
ksu_request_userspace_scan();
|
||||
|
||||
// fallback to packages.list method
|
||||
struct file *fp = ksu_filp_open_compat(SYSTEM_PACKAGES_LIST_PATH, O_RDONLY, 0);
|
||||
if (IS_ERR(fp)) {
|
||||
pr_err("%s: open " SYSTEM_PACKAGES_LIST_PATH " failed: %ld\n",
|
||||
__func__, PTR_ERR(fp));
|
||||
goto out;
|
||||
}
|
||||
|
||||
char chr = 0;
|
||||
loff_t pos = 0;
|
||||
loff_t line_start = 0;
|
||||
char buf[KSU_MAX_PACKAGE_NAME];
|
||||
size_t fallback_count = 0;
|
||||
|
||||
for (;;) {
|
||||
ssize_t count =
|
||||
ksu_kernel_read_compat(fp, &chr, sizeof(chr), &pos);
|
||||
if (count != sizeof(chr))
|
||||
break;
|
||||
if (chr != '\n')
|
||||
continue;
|
||||
|
||||
count = ksu_kernel_read_compat(fp, buf, sizeof(buf),
|
||||
&line_start);
|
||||
|
||||
struct uid_data *data =
|
||||
kzalloc(sizeof(struct uid_data), GFP_ATOMIC);
|
||||
if (!data) {
|
||||
filp_close(fp, 0);
|
||||
goto out;
|
||||
}
|
||||
|
||||
char *tmp = buf;
|
||||
const char *delim = " ";
|
||||
char *package = strsep(&tmp, delim);
|
||||
char *uid = strsep(&tmp, delim);
|
||||
if (!uid || !package) {
|
||||
pr_err("update_uid: package or uid is NULL!\n");
|
||||
kfree(data);
|
||||
break;
|
||||
}
|
||||
|
||||
u32 res;
|
||||
if (kstrtou32(uid, 10, &res)) {
|
||||
pr_err("update_uid: uid parse err\n");
|
||||
kfree(data);
|
||||
break;
|
||||
}
|
||||
data->uid = res;
|
||||
strncpy(data->package, package, KSU_MAX_PACKAGE_NAME);
|
||||
list_add_tail(&data->list, &uid_list);
|
||||
fallback_count++;
|
||||
|
||||
// reset line start
|
||||
line_start = pos;
|
||||
}
|
||||
filp_close(fp, 0);
|
||||
pr_info("Loaded %zu packages from packages.list fallback\n", fallback_count);
|
||||
} else {
|
||||
pr_info("loaded uids from whitelist successfully\n");
|
||||
}
|
||||
|
||||
// now update uid list
|
||||
struct uid_data *np;
|
||||
struct uid_data *n;
|
||||
|
||||
// first, check if manager_uid exist!
|
||||
bool manager_exist = false;
|
||||
bool dynamic_manager_exist = false;
|
||||
|
||||
list_for_each_entry(np, &uid_list, list) {
|
||||
// if manager is installed in work profile, the uid in packages.list is still equals main profile
|
||||
// don't delete it in this case!
|
||||
int manager_uid = ksu_get_manager_uid() % 100000;
|
||||
if (np->uid == manager_uid) {
|
||||
manager_exist = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
// Check for dynamic managers
|
||||
if (!dynamic_manager_exist && ksu_is_dynamic_manager_enabled()) {
|
||||
list_for_each_entry(np, &uid_list, list) {
|
||||
// Check if this uid is a dynamic manager (not the traditional manager)
|
||||
if (ksu_is_any_manager(np->uid) &&
|
||||
np->uid != ksu_get_manager_uid()) {
|
||||
dynamic_manager_exist = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (!manager_exist) {
|
||||
if (ksu_is_manager_uid_valid()) {
|
||||
pr_info("manager is uninstalled, invalidate it!\n");
|
||||
ksu_invalidate_manager_uid();
|
||||
goto prune;
|
||||
}
|
||||
pr_info("Searching manager...\n");
|
||||
search_manager("/data/app", 2, &uid_list);
|
||||
pr_info("Search manager finished\n");
|
||||
} else if (!dynamic_manager_exist && ksu_is_dynamic_manager_enabled()) {
|
||||
// Always perform search when called from dynamic manager rescan
|
||||
pr_info("Dynamic sign enabled, Searching manager...\n");
|
||||
search_manager("/data/app", 2, &uid_list);
|
||||
pr_info("Search Dynamic sign manager finished\n");
|
||||
}
|
||||
|
||||
prune:
|
||||
// then prune the allowlist
|
||||
ksu_prune_allowlist(is_uid_exist, &uid_list);
|
||||
out:
|
||||
// free uid_list
|
||||
list_for_each_entry_safe(np, n, &uid_list, list) {
|
||||
list_del(&np->list);
|
||||
kfree(np);
|
||||
}
|
||||
}
|
||||
|
||||
void ksu_throne_tracker_init(void)
|
||||
{
|
||||
// nothing to do
|
||||
}
|
||||
|
||||
void ksu_throne_tracker_exit(void)
|
||||
{
|
||||
// nothing to do
|
||||
}
|
||||
Reference in New Issue
Block a user