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Small code restructuring

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This commit is contained in:
topjohnwu 2019-03-11 12:44:50 -04:00
parent 771e500468
commit a4a661bf34
1 changed files with 64 additions and 65 deletions
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129
native/jni/magiskhide/proc_monitor.cpp
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@ -391,74 +391,73 @@ void proc_monitor() {
ptrace(PTRACE_DETACH, pid, 0, 0);
}
});
if (WIFSTOPPED(status)) {
if (detaches[pid]) {
PTRACE_LOG("detach\n");
DETACH_AND_CONT;
}
if (WSTOPSIG(status) == SIGTRAP && WEVENT(status)) {
unsigned long msg;
xptrace(PTRACE_GETEVENTMSG, pid, nullptr, &msg);
if (zygote_map.count(pid)) {
// Zygote event
switch (WEVENT(status)) {
case PTRACE_EVENT_FORK:
case PTRACE_EVENT_VFORK:
PTRACE_LOG("zygote forked: [%d]\n", msg);
attaches[msg] = true;
if (unknowns[msg]) {
/* Stop the child again to make sure
* we are monitoring the proper events */
unknowns[msg] = false;
tgkill(msg, msg, SIGSTOP);
}
break;
case PTRACE_EVENT_EXIT:
PTRACE_LOG("zygote exited with status: [%d]\n", msg);
zygote_map.erase(pid);
DETACH_AND_CONT;
default:
PTRACE_LOG("unknown event: %d\n", WEVENT(status));
break;
}
xptrace(PTRACE_CONT, pid);
} else {
switch (WEVENT(status)) {
case PTRACE_EVENT_CLONE:
PTRACE_LOG("create new threads: [%d]\n", msg);
detaches[msg] = true;
if (attaches[pid] && check_pid(pid))
continue;
break;
case PTRACE_EVENT_EXEC:
case PTRACE_EVENT_EXIT:
PTRACE_LOG("exited or execve\n");
DETACH_AND_CONT;
default:
PTRACE_LOG("unknown event: %d\n", WEVENT(status));
break;
}
xptrace(PTRACE_CONT, pid);
}
} else if (WSTOPSIG(status) == SIGSTOP) {
if (attaches[pid]) {
PTRACE_LOG("SIGSTOP from zygote child\n");
xptrace(PTRACE_SETOPTIONS, pid, nullptr,
PTRACE_O_TRACECLONE | PTRACE_O_TRACEEXEC | PTRACE_O_TRACEEXIT);
} else {
PTRACE_LOG("SIGSTOP from unknown\n");
unknowns[pid] = true;
}
xptrace(PTRACE_CONT, pid);
} else {
// Not caused by us, resend signal
xptrace(PTRACE_CONT, pid, nullptr, WSTOPSIG(status));
PTRACE_LOG("signal [%d]\n", WSTOPSIG(status));
}
} else {
if (!WIFSTOPPED(status)) {
// Nothing to do with us
PTRACE_LOG("terminate\n");
DETACH_AND_CONT;
}
if (detaches[pid]) {
PTRACE_LOG("detach\n");
DETACH_AND_CONT;
}
if (WSTOPSIG(status) == SIGTRAP && WEVENT(status)) {
unsigned long msg;
xptrace(PTRACE_GETEVENTMSG, pid, nullptr, &msg);
if (zygote_map.count(pid)) {
// Zygote event
switch (WEVENT(status)) {
case PTRACE_EVENT_FORK:
case PTRACE_EVENT_VFORK:
PTRACE_LOG("zygote forked: [%d]\n", msg);
attaches[msg] = true;
if (unknowns[msg]) {
/* Stop the child again to make sure
* we are monitoring the proper events */
unknowns[msg] = false;
tgkill(msg, msg, SIGSTOP);
}
break;
case PTRACE_EVENT_EXIT:
PTRACE_LOG("zygote exited with status: [%d]\n", msg);
zygote_map.erase(pid);
DETACH_AND_CONT;
default:
PTRACE_LOG("unknown event: %d\n", WEVENT(status));
break;
}
xptrace(PTRACE_CONT, pid);
} else {
switch (WEVENT(status)) {
case PTRACE_EVENT_CLONE:
PTRACE_LOG("create new threads: [%d]\n", msg);
detaches[msg] = true;
if (attaches[pid] && check_pid(pid))
continue;
break;
case PTRACE_EVENT_EXEC:
case PTRACE_EVENT_EXIT:
PTRACE_LOG("exited or execve\n");
DETACH_AND_CONT;
default:
PTRACE_LOG("unknown event: %d\n", WEVENT(status));
break;
}
xptrace(PTRACE_CONT, pid);
}
} else if (WSTOPSIG(status) == SIGSTOP) {
if (attaches[pid]) {
PTRACE_LOG("SIGSTOP from zygote child\n");
xptrace(PTRACE_SETOPTIONS, pid, nullptr,
PTRACE_O_TRACECLONE | PTRACE_O_TRACEEXEC | PTRACE_O_TRACEEXIT);
} else {
PTRACE_LOG("SIGSTOP from unknown\n");
unknowns[pid] = true;
}
xptrace(PTRACE_CONT, pid);
} else {
// Not caused by us, resend signal
xptrace(PTRACE_CONT, pid, nullptr, WSTOPSIG(status));
PTRACE_LOG("signal [%d]\n", WSTOPSIG(status));
}
}
}