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Optimize proc_monitor

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This commit is contained in:
topjohnwu 2018-11-23 14:32:33 -05:00
parent 0784448c69
commit c8c57c74cc
1 changed files with 16 additions and 27 deletions
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43
native/jni/magiskhide/proc_monitor.cpp
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@ -43,29 +43,27 @@ static int read_ns(const int pid, struct stat *st) {
return stat(path, st);
}
static void lazy_unmount(const char* mountpoint) {
static inline void lazy_unmount(const char* mountpoint) {
if (umount2(mountpoint, MNT_DETACH) != -1)
LOGD("hide_daemon: Unmounted (%s)\n", mountpoint);
}
static int parse_ppid(int pid) {
char stat[512], path[32];
int fd, ppid;
char path[32];
int ppid;
sprintf(path, "/proc/%d/stat", pid);
fd = xopen(path, O_RDONLY);
if (fd < 0)
FILE *stat = fopen(path, "r");
if (stat == nullptr)
return -1;
xread(fd, stat, sizeof(stat));
close(fd);
/* PID COMM STATE PPID ..... */
sscanf(stat, "%*d %*s %*c %d", &ppid);
fscanf(stat, "%*d %*s %*c %d", &ppid);
return ppid;
}
static void hide_daemon(int pid) {
LOGD("hide_daemon: start unmount for pid=[%d]\n", pid);
char buffer[PATH_MAX];
char buffer[4096];
Vector<CharArray> mounts;
manage_selinux();
@ -126,30 +124,27 @@ void proc_monitor() {
// Connect to the log daemon
sockfd = connect_log_daemon();
if (sockfd < 0)
return;
pthread_exit(nullptr);
write_int(sockfd, HIDE_CONNECT);
FILE *log_in = fdopen(sockfd, "r");
char buf[4096];
while (fgets(buf, sizeof(buf), log_in)) {
char *ss = strchr(buf, '[');
char *ss = strchr(buf, '[') + 1;
int pid, ppid, num = 0;
char *pos = ss, proc[256];
struct stat ns, pns;
while(1) {
pos = strchr(pos, ',');
if(pos == NULL)
break;
pos[0] = ' ';
while((pos = strchr(pos, ','))) {
*pos = ' ';
++num;
}
if(sscanf(ss, num == 6 ? "[%*d %d %*d %*d %256s" : "[%*d %d %*d %256s", &pid, proc) != 2)
if(sscanf(ss, num == 6 ? "%*d %d %*d %*d %256s" : "%*d %d %*d %256s", &pid, proc) != 2)
continue;
// Make sure our target is alive
if (kill(pid, 0))
if ((ppid = parse_ppid(pid)) < 0 || read_ns(ppid, &pns))
continue;
// Allow hiding sub-services of applications
@ -167,17 +162,11 @@ void proc_monitor() {
}
pthread_mutex_unlock(&list_lock);
if (!hide || (ppid = parse_ppid(pid)) < 0 || read_ns(ppid, &pns) == -1)
if (!hide)
continue;
do {
if (read_ns(pid, &ns) == -1)
break;
if (ns.st_dev == pns.st_dev && ns.st_ino == pns.st_ino)
usleep(50);
else
break;
} while (1);
while (read_ns(pid, &ns) == 0 && ns.st_dev == pns.st_dev && ns.st_ino == pns.st_ino)
usleep(500);
// Send pause signal ASAP
if (kill(pid, SIGSTOP) == -1)