mirror of
https://github.com/topjohnwu/Magisk.git
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135 lines
3.0 KiB
C
135 lines
3.0 KiB
C
/* hide_daemon.c - MagiskHide daemon
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*
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* A dedicated process to join the target namespace,
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* and hide all traces in that particular namespace
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mount.h>
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#include "magisk.h"
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#include "utils.h"
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#include "magiskhide.h"
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static int pid;
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static void lazy_unmount(const char* mountpoint) {
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if (umount2(mountpoint, MNT_DETACH) != -1)
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LOGI("hide_daemon: Unmounted (%s)\n", mountpoint);
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else
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LOGI("hide_daemon: Unmount Failed (%s)\n", mountpoint);
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}
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static void hide_daemon_err() {
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LOGD("hide_daemon: error occured, stopping magiskhide services\n");
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// Resume process if possible
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kill(pid, SIGCONT);
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int err = 1;
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write(sv[1], &err, sizeof(err));
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_exit(-1);
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}
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int hide_daemon() {
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// Fork to a new process
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hide_pid = fork();
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switch(hide_pid) {
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case -1:
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PLOGE("fork");
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return 1;
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case 0:
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break;
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default:
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return 0;
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}
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close(sv[0]);
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// Set the process name
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strcpy(argv0, "magiskhide_daemon");
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// When an error occurs, report its failure to main process
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err_handler = hide_daemon_err;
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int fd;
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FILE *fp;
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char buffer[4096], cache_block[256], *line;
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struct vector mount_list;
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cache_block[0] = '\0';
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while(1) {
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xxread(sv[1], &pid, sizeof(pid));
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// Termination called
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if(pid == -1) {
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LOGD("hide_daemon: received termination request\n");
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_exit(0);
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}
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manage_selinux();
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relink_sbin();
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snprintf(buffer, sizeof(buffer), "/proc/%d/ns/mnt", pid);
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if(access(buffer, F_OK) == -1) continue; // Maybe process died..
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fd = xopen(buffer, O_RDONLY);
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// Switch to its namespace
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xsetns(fd, 0);
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close(fd);
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snprintf(buffer, sizeof(buffer), "/proc/%d/mounts", pid);
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vec_init(&mount_list);
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file_to_vector(buffer, &mount_list);
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// Find the cache block name if not found yet
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if (strlen(cache_block) == 0) {
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vec_for_each(&mount_list, line) {
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if (strstr(line, " /cache ")) {
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sscanf(line, "%256s", cache_block);
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break;
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}
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}
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}
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// First unmount the dummy skeletons, cache mounts, and /sbin links
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vec_for_each_r(&mount_list, line) {
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if (strstr(line, "tmpfs /system") || strstr(line, "tmpfs /vendor") || strstr(line, "tmpfs /sbin")
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|| (strstr(line, cache_block) && strstr(line, "/system/")) ) {
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sscanf(line, "%*s %512s", buffer);
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lazy_unmount(buffer);
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}
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free(line);
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}
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vec_destroy(&mount_list);
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// Re-read mount infos
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snprintf(buffer, sizeof(buffer), "/proc/%d/mounts", pid);
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vec_init(&mount_list);
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file_to_vector(buffer, &mount_list);
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// Unmount loop mounts
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vec_for_each_r(&mount_list, line) {
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if (strstr(line, "/dev/block/loop") && !strstr(line, DUMMYPATH)) {
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sscanf(line, "%*s %512s", buffer);
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lazy_unmount(buffer);
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}
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free(line);
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}
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vec_destroy(&mount_list);
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// All done, send resume signal
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kill(pid, SIGCONT);
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// Tell main process all is well
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pid = 0;
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xwrite(sv[1], &pid, sizeof(pid));
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}
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// Should never go here
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}
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