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Kernel/ProcFS: Clean dead processes properly

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Now we use WeakPtrs to break Ref-counting cycle. Also, we call the
prepare_for_deletion method to ensure deleted objects are ready for
deletion. This is necessary to ensure we don't keep dead processes,
which would become zombies.

In addition to that, add some debug prints to aid debug in the future.
This commit is contained in:
Liav A 2021-07-01 19:18:38 +03:00 • committed by Andreas Kling
commit 3344f91fc4
Notes: sideshowbarker 2024-07-18 11:08:13 +09:00
6 changed files with 103 additions and 43 deletions
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11
Kernel/ProcessExposed.cpp
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@ -157,7 +157,10 @@ KResult ProcFSProcessInformation::refresh_data(FileDescription& description) con
// For process-specific inodes, hold the process's ptrace lock across refresh
// and refuse to load data if the process is not dumpable.
// Without this, files opened before a process went non-dumpable could still be used for dumping.
auto process = const_cast<ProcFSProcessInformation&>(*this).m_parent_folder->m_associated_process;
auto parent_folder = const_cast<ProcFSProcessInformation&>(*this).m_parent_folder.strong_ref();
if (parent_folder.is_null())
return KResult(EINVAL);
auto process = parent_folder->m_associated_process;
process->ptrace_lock().lock();
if (!process->is_dumpable()) {
process->ptrace_lock().unlock();
@ -240,9 +243,11 @@ RefPtr<ProcFSExposedComponent> ProcFSExposedFolder::lookup(StringView name)
KResult ProcFSExposedFolder::traverse_as_directory(unsigned fsid, Function<bool(const FS::DirectoryEntryView&)> callback) const
{
Locker locker(ProcFSComponentsRegistrar::the().m_lock);
VERIFY(m_parent_folder);
auto parent_folder = m_parent_folder.strong_ref();
if (parent_folder.is_null())
return KResult(EINVAL);
callback({ ".", { fsid, component_index() }, 0 });
callback({ "..", { fsid, m_parent_folder->component_index() }, 0 });
callback({ "..", { fsid, parent_folder->component_index() }, 0 });
for (auto& component : m_components) {
InodeIdentifier identifier = { fsid, component.component_index() };