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Kernel: Add jail semantics to methods iterating over thread lists

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We should consider whether the selected Thread is within the same jail
or not.
Therefore let's make it clear to callers with jail semantics if a called
method checks if the desired Thread object is within the same jail.

As for Thread::for_each_* methods, currently nothing in the kernel
codebase needs iteration with consideration for jails, so the old
Thread::for_each* were simply renamed to include "ignoring_jails" suffix
in their names.
This commit is contained in:
Liav A 2023-09-09 18:09:42 +03:00 • committed by Andrew Kaster
parent 3a55a1b592
commit cbaa3465a8
7 changed files with 36 additions and 17 deletions
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22
Kernel/Tasks/Thread.cpp
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@ -589,7 +589,7 @@ void Thread::finalize_dying_threads()
Vector<Thread*, 32> dying_threads;
{
SpinlockLocker lock(g_scheduler_lock);
for_each_in_state(Thread::State::Dying, [&](Thread& thread) {
for_each_in_state_ignoring_jails(Thread::State::Dying, [&](Thread& thread) {
if (!thread.is_finalizable())
return;
auto result = dying_threads.try_append(&thread);
@ -1398,7 +1398,25 @@ ErrorOr<void> Thread::make_thread_specific_region(Badge<Process>)
});
}
RefPtr<Thread> Thread::from_tid(ThreadID tid)
RefPtr<Thread> Thread::from_tid_in_same_jail(ThreadID tid)
{
return Thread::all_instances().with([&](auto& list) -> RefPtr<Thread> {
for (Thread& thread : list) {
if (thread.tid() == tid) {
return Process::current().jail().with([&thread](auto const& my_jail) -> RefPtr<Thread> {
return thread.process().jail().with([&thread, my_jail](auto const& other_thread_process_jail) -> RefPtr<Thread> {
if (my_jail && my_jail.ptr() != other_thread_process_jail.ptr())
return nullptr;
return thread;
});
});
}
}
return nullptr;
});
}
RefPtr<Thread> Thread::from_tid_ignoring_jails(ThreadID tid)
{
return Thread::all_instances().with([&](auto& list) -> RefPtr<Thread> {
for (Thread& thread : list) {