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Kernel: Store Thread name as a KString

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This commit is contained in:
Andreas Kling 2021-08-05 22:22:26 +02:00
parent 07599b48de
commit d5d8fba579
8 changed files with 43 additions and 33 deletions
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24
Kernel/Syscalls/thread.cpp
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@ -54,7 +54,7 @@ KResultOr<FlatPtr> Process::sys$create_thread(void* (*entry)(void*), Userspace<c
// So give it a unique name until the user calls $set_thread_name on it
// length + 4 to give space for our extra junk at the end
StringBuilder builder(m_name.length() + 4);
thread->set_name(String::formatted("{} [{}]", m_name, thread->tid().value()));
thread->set_name(KString::try_create(String::formatted("{} [{}]", m_name, thread->tid().value())));
if (!is_thread_joinable)
thread->detach();
@ -186,12 +186,14 @@ KResultOr<FlatPtr> Process::sys$set_thread_name(pid_t tid, Userspace<const char*
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
REQUIRE_PROMISE(stdio);
auto name = copy_string_from_user(user_name, user_name_length);
if (name.is_null())
return EFAULT;
auto name_or_error = try_copy_kstring_from_user(user_name, user_name_length);
if (name_or_error.is_error())
return name_or_error.error();
auto name = name_or_error.release_value();
const size_t max_thread_name_size = 64;
if (name.length() > max_thread_name_size)
if (name->length() > max_thread_name_size)
return EINVAL;
auto thread = Thread::from_tid(tid);
@ -213,12 +215,20 @@ KResultOr<FlatPtr> Process::sys$get_thread_name(pid_t tid, Userspace<char*> buff
if (!thread || thread->pid() != pid())
return ESRCH;
// We must make a temporary copy here to avoid a race with sys$set_thread_name
ScopedSpinLock locker(thread->get_lock());
auto thread_name = thread->name();
if (thread_name.is_null()) {
char null_terminator = '\0';
if (!copy_to_user(buffer, &null_terminator, sizeof(null_terminator)))
return EFAULT;
return 0;
}
if (thread_name.length() + 1 > buffer_size)
return ENAMETOOLONG;
if (!copy_to_user(buffer, thread_name.characters(), thread_name.length() + 1))
if (!copy_to_user(buffer, thread_name.characters_without_null_termination(), thread_name.length() + 1))
return EFAULT;
return 0;
}