Date: Fri, 21 Nov 2003 13:43:50 +0100 From: Pawel Jakub Dawidek <nick@garage.freebsd.pl> To: Dag-Erling Sm?rgrav <des@des.no> Cc: freebsd-hackers@freebsd.org Subject: Re: "secure" file flag? Message-ID: <20031121124350.GT511@garage.freebsd.pl> In-Reply-To: <xzp65hegd9q.fsf@dwp.des.no> References: <20031119003133.18473.qmail@web11404.mail.yahoo.com> <200311201327.29226.wes@softweyr.com> <20031121095939.GS511@garage.freebsd.pl> <xzp65hegd9q.fsf@dwp.des.no>
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--FZIkiClxIZ9JeWSb Content-Type: text/plain; charset=iso-8859-2 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Nov 21, 2003 at 12:41:05PM +0100, Dag-Erling Sm?rgrav wrote: +> > If this operation is able to fail (and of course it is) it should block +> > on unlink(2). +>=20 +> FreeBSD is not DOS; unlink(2) does not actually remove the file. It +> is removed by the filesystem if the link count is zero when the vnode +> is released, which may be immediately after the unlink(2) call, or an +> indefinite amount of time later if the file was open at the time. I'm aware of this, but what we want to think over here is something like in-kernel 'rm -P'. So file will be overwriten even if it is opened and/or link count is grater than 0. That's why allowing link(2) operation for such files don't make much sens (the problem exists when there are hardlinks before "secure" flag is set). --=20 Pawel Jakub Dawidek pawel@dawidek.net UNIX Systems Programmer/Administrator http://garage.freebsd.pl Am I Evil? Yes, I Am! http://cerber.sourceforge.net --FZIkiClxIZ9JeWSb Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (FreeBSD) iQCVAwUBP74Ihj/PhmMH/Mf1AQEXZAP/Y2x+EpADzKuQoJktUo7k+rXYYJY4izp6 p6XUXH01dMGZyLbQ06cGFa/klGQyb4aN6VtnPrnDrbil/yjvf5e6Xl0uM2yL5fD4 k5r4m3R30zESQSXJdA2cVr4iXtRKpLEe91VU8oDb7WEtQDhDJe5RX+eEqyxAhznQ 96scgU0CvAo= =5F+K -----END PGP SIGNATURE----- --FZIkiClxIZ9JeWSb--
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