Re: file descriptor passing (jail related question)

From: Bill Davidsen (davidsen@tmr.com)
Date: Mon Jul 29 2002 - 06:37:50 EST


On 19 Jul 2002, Shaya Potter wrote:

> If it can be transmited over IP, its a much more serious issue, as all
> one has to do is crack a jail (root inside the jail), crack the local
> system (regular user) run a program that talks to the local system over
> ip, and have the cracked regular user pass a fd in.

But of course you would have no more access outside the jail than the
cracked user. I would expect connections into the jail to behave as if
they were on another machine, which would prevent fd passing. At least the
last time I played with fd passing it didn't work between machines, that
may have been a bug rather than a security features, of course.

-- 
bill davidsen <davidsen@tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.

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