Date: Wed, 13 Nov 2002 11:38:33 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: hackers@FreeBSD.ORG Subject: Re: tty/pty devices not safe in jail? Message-ID: <200211131938.gADJcX1X091590@apollo.backplane.com> References: <98061.1037215858@critter.freebsd.dk>
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: :In message <200211131927.gADJRxP8085877@apollo.backplane.com>, Matthew Dillon w :rites: :> Hmm. While tracking down a null mount issue I think I might have :> come across a potentially serious problem with jail. It seems to :> me that it would be possible for someone inside a jailed environment :> to 'steal' pty's, tty's, or the tty side of a pty that is being :> used from within other jails or by processes outside the jail. Has :> this ever come up before? : :There has always been code in kern/tty_pty.c which makes sure that the :master and slave have the same prison: : : } else if (pti->pt_prison != td->td_ucred->cr_prison) { : return (EBUSY); : : :-- :Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 :phk@FreeBSD.ORG | TCP/IP since RFC 956 Ah, excellent. Is there a limit inside the prison so a jail cannot exhaust all available ptys? -Matt Matthew Dillon <dillon@backplane.com> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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