Date: Sun, 15 Aug 2004 14:38:54 -0700 From: Kris Kennaway <kris@obsecurity.org> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Kris Kennaway <kris@obsecurity.org> Subject: Re: bsdtar's security restrictions (was Re: Spurious EACCES errors from apache) Message-ID: <20040815213854.GA22381@xor.obsecurity.org> In-Reply-To: <200408152136.i7FLapSg024733@apollo.backplane.com> References: <20040813235434.GA75875@xor.obsecurity.org> <20040814063541.GA43063@xor.obsecurity.org> <411FCCCC.8040508@freebsd.org> <200408152136.i7FLapSg024733@apollo.backplane.com>
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--fdj2RfSjLxBAspz7 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, Aug 15, 2004 at 02:36:51PM -0700, Matthew Dillon wrote: > : > This is bad when some of those directories > :> already exist, because other processes trying to access files in the > :> directory hierarchy may lose the race and fail. > : > :<scratching head> I don't think I understand what > :exactly you're trying to do. > : > :You are extracting archives over an existing directory > :that is currently being served by an Apache process in > :order to refresh some (presumably) small number of files? > : > :Give me some more details about your situation and I'll > :see what I can come up with. > : > :Tim >=20 > Using tar for that sort of thing is a bad idea anyway, since tar (and > bsdtar) do not use the create-temporary/write/rename trick to atomica= lly > replace files. This means that a live server like a web server could > easily 'catch' files in the middle of being written, leading to odd= =20 > errors. No, my use is safe because I know the clients are not going to request the files until they're all in place (because of the way jobs are ordered). Kris --fdj2RfSjLxBAspz7 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (FreeBSD) iD8DBQFBH9fuWry0BWjoQKURApvsAJ9UtrkEWOJeDiSxKE9MEZ/Km6JT5wCfRT1n th/BVsyIzF4KzITa6eObZPc= =tPIZ -----END PGP SIGNATURE----- --fdj2RfSjLxBAspz7--
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