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https://github.com/topjohnwu/Magisk.git
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Magisk Hide: Auto unmount necessary files
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topjohnwu
parent
aa54ef10ae
commit
f785dcac3d
159
jni/magiskhide.c
159
jni/magiskhide.c
@ -16,14 +16,35 @@ typedef unsigned short int sa_family_t;
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <asm/unistd.h>
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#include <sys/mount.h>
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#define HIDE_LIST "/magisk/.core/magiskhide/hidelist"
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#define MOUNT_LIST "/dev/mountlist"
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char **file_to_str_arr(FILE *fp, int *size) {
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int allocated = 16;
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char *line = NULL, **array;
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size_t len = 0;
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ssize_t read;
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int hide_size = 0, mount_size = 0;
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char **hide_list, **mount_list;
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time_t last_update = 0;
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array = (char **) malloc(sizeof(char*) * allocated);
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*size = 0;
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while ((read = getline(&line, &len, fp)) != -1) {
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if (*size >= allocated) {
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// Double our allocation and re-allocate
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allocated *= 2;
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array = (char **) realloc(array, sizeof(char*) * allocated);
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}
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// Remove end newline
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if (line[read - 1] == '\n') {
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line[read - 1] = '\0';
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}
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array[*size] = line;
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line = NULL;
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++(*size);
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}
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return array;
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}
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//WARNING: Calling this will change our current namespace
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//We don't care because we don't want to run from here anyway
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@ -32,103 +53,72 @@ int hideMagisk(int pid) {
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asprintf(&path, "/proc/%d/ns/mnt", pid);
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int fd = open(path, O_RDONLY);
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if(fd == -1) return 2;
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//TODO: Fix non arm platforms
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#define SYS_setns 375
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int res = syscall(SYS_setns, fd, 0);
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if(res == -1) return 3;
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int i;
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for(i = mount_size - 1; i >= 0; --i) {
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res = umount2(mount_list[i], MNT_DETACH);
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if (res != -1) printf("Unmounted: %s\n", mount_list[i]);
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else printf("Failed: %s\n", mount_list[i]);
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path = NULL;
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asprintf(&path, "/proc/%d/mounts", pid);
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FILE *mount_fp = fopen(path, "r");
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if (mount_fp == NULL) {
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fprintf(stderr, "Error opening mount list!\n");
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return 1;
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}
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res = umount2("/magisk", MNT_DETACH);
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if (res != -1) printf("Unmounted: %s\n", "/magisk");
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else printf("Failed: %s\n", "/magisk");
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return 0;
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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), mountpoint[256], *sbstr;
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fclose(mount_fp);
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char** file_to_str_arr(const int fd, int *size) {
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int allocated = 16;
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char *buffer, *tok, **array;
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off_t filesize = lseek(fd, 0, SEEK_END);
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buffer = malloc(sizeof(char) * filesize);
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lseek(fd, 0, SEEK_SET);
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read(fd, buffer, filesize);
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array = (char **) malloc(sizeof(char*) * allocated);
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*size = 0;
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tok = strtok(buffer, "\r\n");
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while (tok != NULL) {
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if (*size >= allocated) {
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// Double our allocation and re-allocate
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allocated = allocated * 2;
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array = (char **) realloc(array, sizeof(char*) * allocated);
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}
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if (strlen(tok)) {
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array[*size] = malloc(strlen(tok));
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strcpy(array[*size], tok);
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++(*size);
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}
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tok = strtok(NULL, "\r\n");
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}
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free(buffer);
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return array;
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}
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int load_hide_list(const int fd) {
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int i;
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struct stat file_stat;
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fstat(fd, &file_stat);
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if (file_stat.st_mtime == last_update) {
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return 0;
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int i, unmount = 0;
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for(i = mount_size - 1; i >= 0; --i) {
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if((strstr(mount_list[i], "/dev/block/loop") != NULL)) {
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sscanf(mount_list[i], "%256s %256s", mountpoint, mountpoint);
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if (strstr(mountpoint, "/.core/dummy") != NULL)
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unmount = 0;
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else
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unmount = 1;
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} else if ((sbstr = strstr(mount_list[i], "/.core/dummy")) != NULL) {
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sscanf(sbstr, "/.core/dummy%256s", mountpoint);
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unmount = 1;
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}
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if(unmount) {
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unmount = 0;
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res = umount2(mountpoint, MNT_DETACH);
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if (res != -1) printf("Unmounted: %s\n", mountpoint);
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else printf("Failed: %s\n", mountpoint);
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}
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free(mount_list[i]);
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}
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// Free memory
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for(i = 0; i < hide_size; ++i)
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free(hide_list[i]);
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free(hide_list);
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hide_list = file_to_str_arr(fd, &hide_size);
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fstat(fd, &file_stat);
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last_update = file_stat.st_mtime;
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printf("Get package name from config:\n");
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for(i = 0; i < hide_size; i++)
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printf("%s\n", hide_list[i]);
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printf("\n");
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free(mount_list);
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return 0;
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}
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int main(int argc, char **argv, char **envp) {
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int i;
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if (argc != 2) {
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fprintf(stderr, "%s <process/package name list>\n", argv[0]);
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return 1;
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}
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int i, hide_size;
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char **hide_list;
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int hide_fd = open(HIDE_LIST, O_RDONLY);
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if (hide_fd == -1){
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printf("Error opening hide list\n");
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exit(1);
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FILE *hide_fp = fopen(argv[1], "r");
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if (hide_fp == NULL) {
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fprintf(stderr, "Error opening hide list\n");
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return 1;
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}
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int mount_fd = open(MOUNT_LIST, O_RDONLY);
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if (mount_fd == -1){
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printf("Error opening mount list\n");
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exit(1);
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}
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hide_list = file_to_str_arr(hide_fp, &hide_size);
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fclose(hide_fp);
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mount_list = file_to_str_arr(mount_fd, &mount_size);
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close(mount_fd);
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printf("Get process / package name from config:\n");
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for(i = 0; i < hide_size; i++)
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printf("%s\n", hide_list[i]);
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printf("\n");
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char buffer[512];
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FILE *p = popen("while true;do logcat -b events -v raw -s am_proc_start;sleep 1;done", "r");
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while(!feof(p)) {
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load_hide_list(hide_fd);
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//Format of am_proc_start is (as of Android 5.1 and 6.0)
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//UserID, pid, unix uid, processName, hostingType, hostingName
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fgets(buffer, sizeof(buffer), p);
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@ -163,16 +153,11 @@ int main(int argc, char **argv, char **envp) {
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}
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pclose(p);
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close(hide_fd);
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// Free memory
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for(i = 0; i < hide_size; ++i)
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free(hide_list[i]);
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free(hide_list);
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for(i = 0; i < mount_size; ++i)
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free(mount_list[i]);
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free(mount_list);
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return 0;
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}
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