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[bug #48456] mig-generated user code does not destroy invalid reply


From: Kalle Olavi Niemitalo
Subject: [bug #48456] mig-generated user code does not destroy invalid reply
Date: Wed, 31 Aug 2016 22:35:59 +0000 (UTC)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Firefox/45.0

Follow-up Comment #1, bug #48456 (project hurd):

I wrote: "This could perhaps be used for denial of service, if a long-lived
process calls a less-trusted one."

The exec server is a long-lived process, and it calls several RPC routines on
the FILE and OLDTASK passed to exec_exec, which can be called by anyone.  That
makes it vulnerable to the DoS.  I don't currently have a test case for that.

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