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SubjectRe: [PATCH] POSIX message queues
Hi!

> > 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.

Imagine something that writes data into the que then erases the data and
gets rid of setuid.
Pavel
--
Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.

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