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ptrace: Stop a traced thread when it exists from execve

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This was a missing feature in the PT_TRACEME command.

This feature allows the tracer to interact with the tracee before the
tracee has started executing its program.

It will be useful for automatically inserting a breakpoint at a
debugged program's entry point.
This commit is contained in:
Itamar 2020-04-06 16:08:25 +03:00 • committed by Andreas Kling
parent 4568a628f9
commit 0431712660
3 changed files with 58 additions and 16 deletions
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7
Kernel/Process.cpp
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@ -1243,6 +1243,13 @@ int Process::exec(String path, Vector<String> arguments, Vector<String> environm
if (rc < 0)
return rc;
if (m_wait_for_tracer_at_next_execve) {
ASSERT(Thread::current->state() == Thread::State::Skip1SchedulerPass);
// State::Skip1SchedulerPass is irrelevant since we block the thread
Thread::current->set_state(Thread::State::Running);
Thread::current->send_urgent_signal_to_self(SIGSTOP);
}
if (Process::current == this) {
Scheduler::yield();
ASSERT_NOT_REACHED();