MarcoBuster/Magisk
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Dynamically find libselinux.so path

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This commit is contained in:
topjohnwu 2021-01-13 19:41:57 -08:00
parent f2cb3c38fe
commit 1860e5d133
2 changed files with 23 additions and 23 deletions
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32
native/jni/init/rootdir.cpp
View File

@ -9,12 +9,6 @@
#include "init.hpp"
#include "magiskrc.inc"
#ifdef USE_64BIT
#define LIBNAME "lib64"
#else
#define LIBNAME "lib"
#endif
using namespace std;
static vector<string> rc_list;
@ -182,7 +176,6 @@ static void magic_mount(const string &sdir, const string &ddir = "") {
#define ROOTMIR MIRRDIR "/system_root"
#define MONOPOLICY "/sepolicy"
#define LIBSELINUX "/system/" LIBNAME "/libselinux.so"
#define NEW_INITRC "/system/etc/init/hw/init.rc"
void SARBase::patch_rootdir() {
@ -231,15 +224,25 @@ void SARBase::patch_rootdir() {
close(dest);
}
if (patch_count != 2 && access(LIBSELINUX, F_OK) == 0) {
if (patch_count != 2) {
// init is dynamically linked, need to patch libselinux
auto lib = mmap_data::ro(LIBSELINUX);
const char *path = "/system/lib64/libselinux.so";
if (access(path, F_OK) != 0) {
path = "/system/lib/libselinux.so";
if (access(path, F_OK) != 0)
path = nullptr;
}
if (path) {
char ovl[128];
sprintf(ovl, ROOTOVL "%s", path);
auto lib = mmap_data::ro(path);
lib.patch({make_pair(MONOPOLICY, sepol)});
xmkdirs(dirname(ROOTOVL LIBSELINUX), 0755);
int dest = xopen(ROOTOVL LIBSELINUX, O_CREAT | O_WRONLY | O_CLOEXEC, 0);
xmkdirs(dirname(ovl), 0755);
int dest = xopen(ovl, O_CREAT | O_WRONLY | O_CLOEXEC, 0);
xwrite(dest, lib.buf, lib.sz);
close(dest);
clone_attr(LIBSELINUX, ROOTOVL LIBSELINUX);
clone_attr(path, ovl);
}
}
// sepolicy
@ -251,10 +254,9 @@ void SARBase::patch_rootdir() {
if (connect(sockfd, (struct sockaddr*) &sun, setup_sockaddr(&sun, INIT_SOCKET)) == 0) {
LOGD("ACK init daemon to write backup files\n");
// Let daemon know where tmp_dir is
write_string(sockfd, tmp_dir.data());
write_string(sockfd, tmp_dir);
// Wait for daemon to finish restoring files
int ack;
read(sockfd, &ack, sizeof(ack));
read_int(sockfd);
} else {
LOGD("Restore backup files locally\n");
restore_folder(ROOTOVL, overlays);

8
native/jni/init/twostage.cpp
View File

@ -142,8 +142,6 @@ void FirstStageInit::prepare() {
#define REDIR_PATH "/system/bin/am"
void SARInit::first_stage_prep() {
int pid = getpid();
xmount("tmpfs", "/dev", "tmpfs", 0, "mode=755");
// Patch init binary
@ -174,7 +172,7 @@ void SARInit::first_stage_prep() {
sigaddset(&block, SIGUSR1);
sigprocmask(SIG_BLOCK, &block, &old);
if (int child = xfork(); child) {
if (int child = xfork()) {
LOGD("init daemon [%d]\n", child);
// Wait for children signal
int sig;
@ -190,7 +188,7 @@ void SARInit::first_stage_prep() {
xlisten(sockfd, 1);
// Resume parent
kill(pid, SIGUSR1);
kill(getppid(), SIGUSR1);
// Wait for second stage ack
int client = xaccept4(sockfd, nullptr, nullptr, SOCK_CLOEXEC);
@ -204,7 +202,7 @@ void SARInit::first_stage_prep() {
restore_folder(ROOTOVL, overlays);
// Ack and bail out!
write(sockfd, &sockfd, sizeof(sockfd));
write_int(sockfd, 0);
close(client);
close(sockfd);