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Kernel: Change wait blocking to Process-only blocking

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This prevents zombies created by multi-threaded applications and brings
our model back to closer to what other OSs do.

This also means that SIGSTOP needs to halt all threads, and SIGCONT needs
to resume those threads.
This commit is contained in:
Tom 2020-12-08 21:18:45 -07:00 • committed by Andreas Kling
parent 47ede74326
commit c455fc2030
11 changed files with 284 additions and 203 deletions
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11
Kernel/Ptrace.cpp
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@ -37,7 +37,7 @@ KResultOr<u32> handle_syscall(const Kernel::Syscall::SC_ptrace_params& params, P
{
ScopedSpinLock scheduler_lock(g_scheduler_lock);
if (params.request == PT_TRACE_ME) {
if (Thread::current()->tracer())
if (Process::current()->tracer())
return KResult(-EBUSY);
caller.set_wait_for_tracer_at_next_execve(true);
@ -59,11 +59,12 @@ KResultOr<u32> handle_syscall(const Kernel::Syscall::SC_ptrace_params& params, P
|| (peer->process().uid() != peer->process().euid())) // Disallow tracing setuid processes
return KResult(-EACCES);
auto& peer_process = peer->process();
if (params.request == PT_ATTACH) {
if (peer->tracer()) {
if (peer_process.tracer()) {
return KResult(-EBUSY);
}
peer->start_tracing_from(caller.pid());
peer_process.start_tracing_from(caller.pid());
ScopedSpinLock lock(peer->get_lock());
if (peer->state() != Thread::State::Stopped) {
peer->send_signal(SIGSTOP, &caller);
@ -71,7 +72,7 @@ KResultOr<u32> handle_syscall(const Kernel::Syscall::SC_ptrace_params& params, P
return KSuccess;
}
auto* tracer = peer->tracer();
auto* tracer = peer_process.tracer();
if (!tracer)
return KResult(-EPERM);
@ -88,7 +89,7 @@ KResultOr<u32> handle_syscall(const Kernel::Syscall::SC_ptrace_params& params, P
break;
case PT_DETACH:
peer->stop_tracing();
peer_process.stop_tracing();
peer->send_signal(SIGCONT, &caller);
break;