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Kernel: Inherit shared buffers when forking

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We need to create a reference for the new PID for each shared buffer
that the process had a reference to. If the process subsequently
get replaced through exec, those references will be dropped again.
But if exec for some reason fails then other code, such as global
destructors could still expect having access to them.

Fixes #4076
This commit is contained in:
Tom 2020-11-22 15:25:48 -07:00 • committed by Andreas Kling
parent 48369194d2
commit a89648e159
3 changed files with 20 additions and 0 deletions
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16
Kernel/SharedBuffer.cpp
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@ -121,6 +121,22 @@ void SharedBuffer::share_with(ProcessID peer_pid)
sanity_check("share_with (new ref)");
}
void SharedBuffer::share_all_shared_buffers(Process& from_process, Process& with_process)
{
LOCKER(shared_buffers().lock());
for (auto& shbuf : shared_buffers().resource()) {
auto& shared_buffer = *shbuf.value;
if (shared_buffer.m_global)
continue;
for (auto& ref : shared_buffer.m_refs) {
if (ref.pid == from_process.pid()) {
shared_buffer.share_with(with_process.pid());
break;
}
}
}
}
void SharedBuffer::deref_for_process(Process& process)
{
LOCKER(shared_buffers().lock());