MarcoBuster/Magisk
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Directly inject services into init.rc

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This commit is contained in:
topjohnwu 2019-02-09 02:48:05 -05:00
parent c8491d008f
commit ed25e1bbd6
1 changed files with 10 additions and 42 deletions
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52
native/jni/core/init.cpp
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@ -312,21 +312,6 @@ static int dump_manager(const char *path, mode_t mode) {
return 0;
}
static int dump_magiskrc(const char *path, mode_t mode) {
int fd = creat(path, mode);
if (fd < 0)
return 1;
char startup_svc[8], late_start_svc[8], rc[sizeof(magiskrc) + 100];
gen_rand_str(startup_svc, sizeof(startup_svc));
do {
gen_rand_str(late_start_svc, sizeof(late_start_svc));
} while (strcmp(startup_svc, late_start_svc) == 0);
int size = sprintf(rc, magiskrc, startup_svc, startup_svc, late_start_svc);
xwrite(fd, rc, size);
close(fd);
return 0;
}
static void patch_socket_name(const char *path) {
uint8_t *buf;
char name[sizeof(MAIN_SOCKET)];
@ -347,30 +332,15 @@ static void patch_socket_name(const char *path) {
munmap(buf, size);
}
static void setup_rc() {
// Patch init.rc to load magisk scripts
bool injected = false;
char line[4096];
FILE *fp = xfopen("/init.rc", "r");
int fd = open("/init.rc.new", O_WRONLY | O_CREAT | O_CLOEXEC, 0750);
while(fgets(line, sizeof(line), fp)) {
if (!injected && strncmp(line, "import", 6) == 0) {
if (strstr(line, "init.magisk.rc")) {
injected = true;
} else {
xwrite(fd, "import /init.magisk.rc\n", 23);
injected = true;
}
} else if (strstr(line, "selinux.reload_policy")) {
// Do not allow sepolicy patch
continue;
}
xwrite(fd, line, strlen(line));
}
fclose(fp);
close(fd);
rename("/init.rc.new", "/init.rc");
dump_magiskrc(MAGISKRC, 0750);
static void setup_init_rc() {
FILE *rc = xfopen("/init.rc", "ae");
char pfd_svc[8], ls_svc[8];
gen_rand_str(pfd_svc, sizeof(pfd_svc));
do {
gen_rand_str(ls_svc, sizeof(ls_svc));
} while (strcmp(pfd_svc, ls_svc) == 0);
fprintf(rc, magiskrc, pfd_svc, pfd_svc, ls_svc);
fclose(rc);
}
static const char wrapper[] =
@ -468,8 +438,6 @@ int main(int argc, char *argv[]) {
return dump_magisk(argv[3], 0755);
else if (strcmp(argv[2], "manager") == 0)
return dump_manager(argv[3], 0644);
else if (strcmp(argv[2], "magiskrc") == 0)
return dump_magiskrc(argv[3], 0755);
}
// Prevent file descriptor confusion
@ -574,7 +542,7 @@ int main(int argc, char *argv[]) {
sbin = xopen("/sbin", O_RDONLY | O_CLOEXEC);
link_dir(sbin, root);
setup_rc();
setup_init_rc();
patch_sepolicy();
// Close all file descriptors