Date: Sun, 2 Apr 2006 23:21:30 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Tom Lane <tgl@sss.pgh.pa.us> Cc: "Marc G. Fournier" <scrappy@postgresql.org>, pgsql-hackers@postgresql.org, freebsd-stable@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: [HACKERS] semaphore usage "port based"? Message-ID: <20060403032130.GA58053@xor.obsecurity.org> In-Reply-To: <27515.1144034269@sss.pgh.pa.us> References: <26796.1144028094@sss.pgh.pa.us> <20060402225204.U947@ganymede.hub.org> <26985.1144029657@sss.pgh.pa.us> <20060402231232.C947@ganymede.hub.org> <27148.1144030940@sss.pgh.pa.us> <20060402232832.M947@ganymede.hub.org> <20060402234459.Y947@ganymede.hub.org> <27417.1144033691@sss.pgh.pa.us> <20060403031157.GA57914@xor.obsecurity.org> <27515.1144034269@sss.pgh.pa.us>
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--AhhlLboLdkugWU4S Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, Apr 02, 2006 at 11:17:49PM -0400, Tom Lane wrote: > Kris Kennaway <kris@obsecurity.org> writes: > > On Sun, Apr 02, 2006 at 11:08:11PM -0400, Tom Lane wrote: > >> If this is the story, then FBSD have broken their system and must reve= rt > >> their change. They do not have kernel behavior that totally hides the > >> existence of the other process, and therefore having some calls that > >> pretend it's not there is simply inconsistent. >=20 > > I'm guessing it's a deliberate change to prevent the information > > leakage between jails. >=20 > I have no objection to doing that, so long as you are actually doing it > correctly. This example shows that each jail must have its own SysV > semaphore key space, else information leaks anyway. By default SysV shared memory is disallowed in jails. Kris --AhhlLboLdkugWU4S Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (FreeBSD) iD8DBQFEMJS6Wry0BWjoQKURAk2eAKC3+8tnCW5pGTmNN7bkiqarXZTw8gCeMXaY Rzcc2FvkkH+61J/iEJuTsPs= =Sxbh -----END PGP SIGNATURE----- --AhhlLboLdkugWU4S--
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