Kernel: VERIFY that signals are not sent to Kernel processes

Kernel processes can't handle signals, nor should they ever receive any
orospakr · Feb 21, 2022 · 0911112 · 0911112
1 parent 2c996cb
commit 0911112
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diff --git a/Kernel/Process.cpp b/Kernel/Process.cpp
@@ -707,6 +707,7 @@ void Process::terminate_due_to_signal(u8 signal)
 
 ErrorOr<void> Process::send_signal(u8 signal, Process* sender)
 {
+ VERIFY(is_user_process());
  // Try to send it to the "obvious" main thread:
  auto receiver_thread = Thread::from_tid(pid().value());
  // If the main thread has died, there may still be other threads:

diff --git a/Kernel/Thread.cpp b/Kernel/Thread.cpp
@@ -721,6 +721,7 @@ u32 Thread::pending_signals_for_state() const
 void Thread::send_signal(u8 signal, [[maybe_unused]] Process* sender)
 {
  VERIFY(signal < 32);
+ VERIFY(process().is_user_process());
  SpinlockLocker scheduler_lock(g_scheduler_lock);
 
  // FIXME: Figure out what to do for masked signals. Should we also ignore them here?