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Kernel: Don't leak an FPU state buffer for every spawned thread

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We were leaking 512 bytes of kmalloc memory for every new thread.
This patch fixes that, and also makes sure to zero out the FPU state
buffer after allocating it, and finally also makes the LogStream
operator<< for Thread look a little bit nicer. :^)
This commit is contained in:
Andreas Kling
2019-10-13 14:36:55 +02:00
parent 517e78a7e2
commit 40beb4c5c0
2 changed files with 7 additions and 5 deletions
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7
Kernel/Thread.cpp
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@@ -50,6 +50,7 @@ Thread::Thread(Process& process)
dbgprintf("Thread{%p}: New thread TID=%u in %s(%u)\n", this, m_tid, process.name().characters(), process.pid());
set_default_signal_dispositions();
m_fpu_state = (FPUState*)kmalloc_aligned(sizeof(FPUState), 16);
memset(m_fpu_state, 0, sizeof(FPUState));
memset(&m_tss, 0, sizeof(m_tss));
// Only IF is set when a process boots.
@@ -564,7 +565,6 @@ Thread* Thread::clone(Process& process)
auto* clone = new Thread(process);
memcpy(clone->m_signal_action_data, m_signal_action_data, sizeof(m_signal_action_data));
clone->m_signal_mask = m_signal_mask;
clone->m_fpu_state = (FPUState*)kmalloc_aligned(sizeof(FPUState), 16);
memcpy(clone->m_fpu_state, m_fpu_state, sizeof(FPUState));
clone->m_has_used_fpu = m_has_used_fpu;
clone->m_thread_specific_data = m_thread_specific_data;
@@ -658,3 +658,8 @@ void Thread::make_thread_specific_region(Badge<Process>)
if (process().m_master_tls_size)
memcpy(thread_local_storage, process().m_master_tls_region->vaddr().as_ptr(), process().m_master_tls_size);
}
const LogStream& operator<<(const LogStream& stream, const Thread& value)
{
return stream << value.process().name() << "(" << value.pid() << ":" << value.tid() << ")";
}