113 lines
2.8 KiB
C
113 lines
2.8 KiB
C
#include "magiskhide.h"
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int hideMagisk() {
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close(pipefd[1]);
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int pid, zygote_num = 0;
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char cache_block[256], zygote_ns[2][32];
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cache_block[0] = '\0';
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// Set to the top priority
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setpriority(PRIO_PROCESS, 0, -20);
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// Get the mount namespace of zygote
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FILE *p = popen("/data/busybox/ps | grep zygote | grep -v grep", "r");
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while(fgets(buffer, sizeof(buffer), p)) {
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if (zygote_num == 2) break;
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sscanf(buffer, "%d", &pid);
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read_namespace(pid, zygote_ns[zygote_num], 32);
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++zygote_num;
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}
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pclose(p);
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for (i = 0; i < zygote_num; ++i)
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fprintf(logfile, "Zygote(%d) ns=%s ", i, zygote_ns[i]);
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fprintf(logfile, "\n");
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while(1) {
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read(pipefd[0], &pid, sizeof(pid));
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// Termination called
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if(pid == -1) break;
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int badns, fd;
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while(1) {
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badns = 0;
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read_namespace(pid, buffer, 32);
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printf("%s\n", buffer);
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for (i = 0; i < zygote_num; ++i) {
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if (strcmp(buffer, zygote_ns[i]) == 0) {
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usleep(500);
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badns = 1;
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break;
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}
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}
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if (!badns) break;
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}
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// Send pause signal ASAP
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if (kill(pid, SIGSTOP) == -1) continue;
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fprintf(logfile, "ns=%s)\n", buffer);
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snprintf(buffer, sizeof(buffer), "/proc/%d/ns/mnt", pid);
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if((fd = open(buffer, O_RDONLY)) == -1) continue; // Maybe process died..
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if(setns(fd, 0) == -1) {
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fprintf(logfile, "MagiskHide: Unable to change namespace for pid=%d\n", pid);
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continue;
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}
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close(fd);
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snprintf(buffer, sizeof(buffer), "/proc/%d/mounts", pid);
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FILE *mount_fp = fopen(buffer, "r");
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if (mount_fp == NULL) {
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fprintf(logfile, "MagiskHide: Error opening mount list!\n");
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continue;
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}
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int mount_size;
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char **mount_list = file_to_str_arr(mount_fp, &mount_size);
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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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for(i = 0; i < mount_size; ++i) {
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if (strstr(mount_list[i], " /cache ")) {
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sscanf(mount_list[i], "%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 and the cache mounts
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for(i = mount_size - 1; i >= 0; --i) {
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if (strstr(mount_list[i], "tmpfs /system/") || strstr(mount_list[i], "tmpfs /vendor/")
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|| (strstr(mount_list[i], cache_block) && strstr(mount_list[i], "/system")) ) {
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sscanf(mount_list[i], "%*s %512s", buffer);
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lazy_unmount(buffer);
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}
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free(mount_list[i]);
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}
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free(mount_list);
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// Re-read mount infos
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fseek(mount_fp, 0, SEEK_SET);
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mount_list = file_to_str_arr(mount_fp, &mount_size);
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fclose(mount_fp);
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// Unmount loop mounts
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for(i = mount_size - 1; i >= 0; --i) {
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if (strstr(mount_list[i], "/dev/block/loop") && !strstr(mount_list[i], DUMMYPATH)) {
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sscanf(mount_list[i], "%*s %512s", buffer);
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lazy_unmount(buffer);
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}
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free(mount_list[i]);
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}
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free(mount_list);
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// Send resume signal
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kill(pid, SIGCONT);
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}
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// Should never go here
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return 1;
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}
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