Messages in this thread |  | | Date | Fri, 6 Sep 2002 10:04:06 +0000 | From | Pavel Machek <> | Subject | Re: [PATCH] POSIX message queues |
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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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