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Kernel: Don't allocate memory for names of processes and threads

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Instead, use the FixedCharBuffer class to ensure we always use a static
buffer storage for these names. This ensures that if a Process or a
Thread were created, there's a guarantee that setting a new name will
never fail, as only copying of strings should be done to that static
storage.

The limits which are set are 32 characters for processes' names and 64
characters for thread names - this is because threads' names could be
more verbose than processes' names.
This commit is contained in:
Liav A 2023-07-17 18:34:19 +03:00 • committed by Andrew Kaster
parent 0d30f558f4
commit 3fd4997fc2
22 changed files with 102 additions and 110 deletions
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8
Kernel/Syscalls/execve.cpp
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@ -480,9 +480,6 @@ ErrorOr<void> Process::do_exec(NonnullRefPtr<OpenFileDescription> main_program_d
auto last_part = path->view().find_last_split_view('/');
auto new_process_name = TRY(KString::try_create(last_part));
auto new_main_thread_name = TRY(new_process_name->try_clone());
auto allocated_space = TRY(Memory::AddressSpace::try_create(*this, nullptr));
OwnPtr<Memory::AddressSpace> old_space;
auto old_master_tls_region = m_master_tls_region;
@ -659,8 +656,9 @@ ErrorOr<void> Process::do_exec(NonnullRefPtr<OpenFileDescription> main_program_d
// and we don't want to deal with faults after this point.
auto new_userspace_sp = TRY(make_userspace_context_for_main_thread(new_main_thread->regs(), *load_result.stack_region.unsafe_ptr(), m_arguments, m_environment, move(auxv)));
set_name(move(new_process_name));
new_main_thread->set_name(move(new_main_thread_name));
// NOTE: The Process and its first thread share the same name.
set_name(last_part);
new_main_thread->set_name(last_part);
if (wait_for_tracer_at_next_execve()) {
// Make sure we release the ptrace lock here or the tracer will block forever.