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Kernel: Make Process creation APIs OOM safe

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This change looks more involved than it actually is. This simply
reshuffles the previous Process constructor and splits out the
parts which can fail (resource allocation) into separate methods
which can be called from a factory method. The factory is then
used everywhere instead of the constructor.
This commit is contained in:
Brian Gianforcaro 2021-05-14 04:55:43 -07:00 • committed by Andreas Kling
parent 77868abe6a
commit ede1483e48
3 changed files with 30 additions and 8 deletions
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4
Kernel/Syscalls/fork.cpp
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@ -17,8 +17,8 @@ KResultOr<pid_t> Process::sys$fork(RegisterState& regs)
{
REQUIRE_PROMISE(proc);
RefPtr<Thread> child_first_thread;
auto child = adopt_ref(*new Process(child_first_thread, m_name, uid(), gid(), pid(), m_is_kernel_process, m_cwd, m_executable, m_tty, this));
if (!child_first_thread)
auto child = Process::create(child_first_thread, m_name, uid(), gid(), pid(), m_is_kernel_process, m_cwd, m_executable, m_tty, this);
if (!child || !child_first_thread)
return ENOMEM;
child->m_root_directory = m_root_directory;
child->m_root_directory_relative_to_global_root = m_root_directory_relative_to_global_root;