> That is the fundamental problem with a userspace shared memory
> implementation: write permissions on a message queue should grant
> mq_send(), but write permissions on shared memory grant a lot more than
> just that.
is it really a problem? As long as the read and write queues are separated
per sender, all that can happen is that a sender is allowed to read his
own messages - that is not an exciting capability.
Ingo
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