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Massive sepolicy refactor

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topjohnwu
2018-04-15 03:18:18 +08:00
parent 9194c50590
commit 87f6018468
13 changed files with 71 additions and 112 deletions
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native/jni/core/daemon.c
+39 -27
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@@ -19,8 +19,11 @@
#include "utils.h"
#include "daemon.h"
#include "resetprop.h"
#include "magiskpolicy.h"
int is_daemon_init = 0, seperate_vendor = 0;
int is_daemon_init = 0;
int seperate_vendor = 0;
int full_patch_pid;
static void *request_handler(void *args) {
int client = *((int *) args);
@@ -133,23 +136,50 @@ void daemon_init() {
LOGI("* Creating /sbin overlay");
DIR *dir;
struct dirent *entry;
int root, sbin;
int root, sbin, fd;
char buf[PATH_MAX], buf2[PATH_MAX];
char magisk_name[10], init_name[10];
void *data;
size_t size;
// Setup links under /sbin
// Create hardlink mirror of /sbin to /root
xmount(NULL, "/", NULL, MS_REMOUNT, NULL);
xmkdir("/root", 0755);
chmod("/root", 0755);
full_read("/sbin/magisk", &data, &size);
root = xopen("/root", O_RDONLY | O_CLOEXEC);
sbin = xopen("/sbin", O_RDONLY | O_CLOEXEC);
link_dir(sbin, root);
unlink("/sbin/magisk");
close(sbin);
// Mount the /sbin tmpfs overlay
xmount("tmpfs", "/sbin", "tmpfs", 0, NULL);
chmod("/sbin", 0755);
setfilecon("/sbin", "u:object_r:rootfs:s0");
// Setup magisk
fd = creat("/sbin/magisk", 0755);
xwrite(fd, data, size);
close(fd);
free(data);
setfilecon("/sbin/magisk", "u:object_r:"SEPOL_FILE_DOMAIN":s0");
for (int i = 0; applet[i]; ++i) {
snprintf(buf, PATH_MAX, "/sbin/%s", applet[i]);
xsymlink("/sbin/magisk", buf);
}
// Setup magiskinit
full_read("/root/magiskinit", &data, &size);
unlink("/root/magiskinit");
fd = creat("/sbin/magiskinit", 0755);
xwrite(fd, data, size);
close(fd);
free(data);
setfilecon("/sbin/magiskinit", "u:object_r:"SEPOL_FILE_DOMAIN":s0");
for (int i = 0; init_applet[i]; ++i) {
snprintf(buf, PATH_MAX, "/sbin/%s", init_applet[i]);
xsymlink("/sbin/magiskinit", buf);
}
// Create symlinks pointing back to /root
dir = xfdopendir(root);
while((entry = xreaddir(dir))) {
if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0) continue;
@@ -158,29 +188,11 @@ void daemon_init() {
xsymlink(buf, buf2);
}
gen_rand_str(magisk_name, sizeof(magisk_name));
snprintf(buf, PATH_MAX, "/root/%s", magisk_name);
unlink("/sbin/magisk");
rename("/root/magisk", buf);
xsymlink(buf, "/sbin/magisk");
for (int i = 0; applet[i]; ++i) {
snprintf(buf2, PATH_MAX, "/sbin/%s", applet[i]);
xsymlink(buf, buf2);
}
gen_rand_str(init_name, sizeof(init_name));
snprintf(buf, PATH_MAX, "/root/%s", init_name);
unlink("/sbin/magiskinit");
rename("/root/magiskinit", buf);
for (int i = 0; init_applet[i]; ++i) {
snprintf(buf2, PATH_MAX, "/sbin/%s", init_applet[i]);
xsymlink(buf, buf2);
}
close(root);
xmount(NULL, "/", NULL, MS_REMOUNT | MS_RDONLY, NULL);
full_patch_pid = exec_command(0, NULL, NULL, "/sbin/magiskpolicy", "--live", "allow "SEPOL_PROC_DOMAIN" * * *", NULL);
LOGI("* Mounting mirrors");
struct vector mounts;
vec_init(&mounts);
@@ -239,7 +251,7 @@ void daemon_init() {
void start_daemon() {
setsid();
setcon("u:r:su:s0");
setcon("u:r:"SEPOL_PROC_DOMAIN":s0");
umask(0);
int fd = xopen("/dev/null", O_RDWR | O_CLOEXEC);
xdup2(fd, STDIN_FILENO);