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633006926f
This is done with 2 major steps:
1. Remove JailManagement singleton and use a structure that resembles
what we have with the Process object. This is required later for the
second step in this commit, but on its own, is a major change that
removes this clunky singleton that had no real usage by itself.
2. Use IntrusiveLists to keep references to Process objects in the same
Jail so it will be much more straightforward to iterate on this kind
of objects when needed. Previously we locked the entire Process list
and we did a simple pointer comparison to check if the checked
Process we iterate on is in the same Jail or not, which required
taking multiple Spinlocks in a very clumsy and heavyweight way.
83 lines
2.2 KiB
C++
83 lines
2.2 KiB
C++
/*
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* Copyright (c) 2022-2023, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/IntrusiveList.h>
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#include <AK/Singleton.h>
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#include <Kernel/Jail.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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static Atomic<u64> s_jail_id;
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static Singleton<SpinlockProtected<Jail::List, LockRank::None>> s_all_instances {};
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static JailIndex generate_jail_id()
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{
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return s_jail_id.fetch_add(1);
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}
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NonnullRefPtr<ProcessList> Jail::process_list()
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{
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return m_process_list;
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}
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ErrorOr<NonnullLockRefPtr<Jail>> Jail::create(NonnullOwnPtr<KString> name)
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{
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return s_all_instances->with([&](auto& list) -> ErrorOr<NonnullLockRefPtr<Jail>> {
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auto process_list = TRY(ProcessList::create());
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auto jail = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) Jail(move(name), generate_jail_id(), move(process_list))));
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list.append(jail);
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return jail;
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});
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}
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ErrorOr<void> Jail::for_each_when_process_is_not_jailed(Function<ErrorOr<void>(Jail const&)> callback)
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{
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return Process::current().jail().with([&](auto const& my_jail) -> ErrorOr<void> {
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// Note: If we are in a jail, don't reveal anything about the outside world,
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// not even the fact that we are in which jail...
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if (my_jail)
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return {};
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return s_all_instances->with([&](auto& list) -> ErrorOr<void> {
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for (auto& jail : list) {
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TRY(callback(jail));
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}
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return {};
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});
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});
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}
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LockRefPtr<Jail> Jail::find_by_index(JailIndex index)
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{
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return s_all_instances->with([&](auto& list) -> LockRefPtr<Jail> {
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for (auto& jail : list) {
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if (jail.index() == index)
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return jail;
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}
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return {};
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});
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}
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Jail::Jail(NonnullOwnPtr<KString> name, JailIndex index, NonnullRefPtr<ProcessList> process_list)
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: m_name(move(name))
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, m_index(index)
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, m_process_list(move(process_list))
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{
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}
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void Jail::detach(Badge<Process>)
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{
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VERIFY(ref_count() > 0);
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m_attach_count.with([&](auto& my_attach_count) {
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VERIFY(my_attach_count > 0);
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my_attach_count--;
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if (my_attach_count == 0) {
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m_list_node.remove();
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}
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});
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}
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}
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