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Kernel: Don't remove from SharedBuffer map while iterating it.

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This was causing a finalizer crash when handling a process that co-owned
multiple shared buffers.
This commit is contained in:
Andreas Kling 2019-02-20 21:31:52 +01:00
parent d054fbee91
commit 6158f456fa
1 changed files with 9 additions and 3 deletions
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12
Kernel/Process.cpp
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@ -2455,13 +2455,18 @@ void SharedBuffer::destroy_if_unused()
void Process::disown_all_shared_buffers()
{
LOCKER(shared_buffers().lock());
for (auto& it : shared_buffers().resource()) {
(*it.value).disown(m_pid);
}
Vector<SharedBuffer*> buffers_to_disown;
for (auto& it : shared_buffers().resource())
buffers_to_disown.append(it.value.ptr());
for (auto* shared_buffer : buffers_to_disown)
shared_buffer->disown(m_pid);
}
int Process::sys$create_shared_buffer(pid_t peer_pid, size_t size, void** buffer)
{
if (!size)
return -EINVAL;
size = PAGE_ROUND_UP(size);
if (!peer_pid || peer_pid < 0 || peer_pid == m_pid)
return -EINVAL;
if (!validate_write_typed(buffer))
@ -2476,6 +2481,7 @@ int Process::sys$create_shared_buffer(pid_t peer_pid, size_t size, void** buffer
int shared_buffer_id = ++s_next_shared_buffer_id;
auto shared_buffer = make<SharedBuffer>(m_pid, peer_pid, size);
shared_buffer->m_shared_buffer_id = shared_buffer_id;
ASSERT(shared_buffer->size() >= size);
shared_buffer->m_pid1_region = allocate_region_with_vmo(LinearAddress(), shared_buffer->size(), shared_buffer->m_vmo.copy_ref(), 0, "SharedBuffer", true, true);
shared_buffer->m_pid1_region->set_shared(true);
*buffer = shared_buffer->m_pid1_region->laddr().as_ptr();