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Make zygote notifier more reliable

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This commit is contained in:
topjohnwu 2019-03-06 18:22:04 -05:00
parent 6226f875ff
commit 82c864d57e
6 changed files with 31 additions and 25 deletions
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2
native/jni/core/bootstages.cpp
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@ -583,7 +583,7 @@ static void dump_logs() {
sprintf(buf, "/system/bin/%s", app);
if (lstat(buf, &st) == 0 && S_ISREG(st.st_mode)) {
clone_attr(buf, MAGISKTMP "/app_process");
bind_mount(MAGISKTMP "/app_process", buf);
bind_mount(MAGISKTMP "/app_process", buf, false);
}
}
unblock_boot_process();

1
native/jni/core/magisk.cpp
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@ -129,6 +129,7 @@ int app_process_main(int argc, char *argv[]) {
int fd = connect_daemon();
write_int(fd, ZYGOTE_NOTIFY);
write_string(fd, path);
read_int(fd);
close(fd);
} else {
// Redirect to system mirror

1
native/jni/include/daemon.h
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@ -80,7 +80,6 @@ void install_apk(const char *apk);
void magiskhide_handler(int client);
void zygote_notify(int client, struct ucred *cred);
void zygote_notify(int pid);
/*************
* Superuser *

20
native/jni/magiskhide/hide_utils.cpp
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@ -18,7 +18,7 @@
using namespace std;
static pthread_t proc_monitor_thread;
pthread_t proc_monitor_thread;
static const char *prop_key[] =
{ "ro.boot.vbmeta.device_state", "ro.boot.verifiedbootstate", "ro.boot.flash.locked",
@ -328,21 +328,3 @@ void auto_start_magiskhide() {
}
}
int next_zygote = -1;
void zygote_notify(int pid) {
if (hide_enabled) {
MutexGuard lock(monitor_lock);
next_zygote = pid;
pthread_kill(proc_monitor_thread, SIGZYGOTE);
}
}
void zygote_notify(int client, struct ucred *cred) {
char *path = read_string(client);
close(client);
zygote_notify(cred->pid);
usleep(100000);
xmount(MAGISKTMP "/app_process", path, nullptr, MS_BIND, nullptr);
free(path);
}

6
native/jni/magiskhide/magiskhide.h
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@ -1,5 +1,4 @@
#ifndef MAGISK_HIDE_H
#define MAGISK_HIDE_H
#pragma once
#include <pthread.h>
#include <sys/types.h>
@ -54,6 +53,7 @@ static inline int parse_int(const char *s) {
return val;
}
extern pthread_t proc_monitor_thread;
extern bool hide_enabled;
extern pthread_mutex_t monitor_lock;
extern std::set<std::pair<std::string, std::string>> hide_set;
@ -75,5 +75,3 @@ enum {
HIDE_ITEM_NOT_EXIST,
HIDE_NO_NS
};
#endif

26
native/jni/magiskhide/proc_monitor.cpp
View File

@ -241,6 +241,32 @@ static void term_thread(int) {
//#define PTRACE_LOG(fmt, args...) LOGD("PID=[%d] " fmt, pid, ##args)
#define PTRACE_LOG(...)
int next_zygote = -1;
void zygote_notify(int client, struct ucred *cred) {
char *path = read_string(client);
xptrace(PTRACE_ATTACH, cred->pid);
// Wait for attach
waitpid(cred->pid, nullptr, __WALL | __WNOTHREAD);
xptrace(PTRACE_CONT, cred->pid);
write_int(client, 0);
close(client);
// Wait for exec
waitpid(cred->pid, nullptr, __WALL | __WNOTHREAD);
xptrace(PTRACE_DETACH, cred->pid);
if (hide_enabled) {
MutexGuard lock(monitor_lock);
next_zygote = cred->pid;
pthread_kill(proc_monitor_thread, SIGZYGOTE);
}
// Remount zygote notifier ASAP
xmount(MAGISKTMP "/app_process", path, nullptr, MS_BIND, nullptr);
free(path);
}
static bool check_pid(int pid) {
char path[128];
char cmdline[1024];