Date: Wed, 07 Jun 2000 09:52:34 +0100 From: David Pick <D.M.Pick@qmw.ac.uk> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Cy Schubert - ITSD Open Systems Group <Cy.Schubert@uumail.gov.bc.ca>, "mouss" <usebsd@free.fr>, "Peter van Dijk" <petervd@vuurwerk.nl>, freebsd-security@FreeBSD.ORG Subject: Re: FreeBSDDEATH.c.txt (mmap dirty page no check bug) Message-ID: <E12zbZi-0000w9-00@xi.css.qmw.ac.uk> In-Reply-To: Your message of "Tue, 06 Jun 2000 23:55:03 PDT." <200006070655.XAA97086@apollo.backplane.com>
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> Maybe on your system it is, but try running a multi-user system that > way and you will quickly find your /var/tmp filled up to the brim. Or, > worse, you will find one of the two tmp directories filling up while > the other remains entirely empty, or vise-versa depending on which > programs your users run. > > The argument that we should have two tmp's because one should be > treated differently from the other doesn't hold any water. There > should be one tmp, period. Since programs tend to use /var/tmp > and /tmp interchangeably these days, one has to be a symlink to the > other. But trying to classify the two as having to have different > characteristics only creates sysadmin headaches. > > What it comes down to is that it is far easier and far more robust to > have a single (larger) temporary filesystem to maintain then to have > two. I think I have to agree with Matthews comments here. Generally, one filesystem for temporary files uses disc space better and means there are a smaller number of filesystems that can get filled up by rampant "temporary" file creations. Personally, I prefer a separate filesystem (on disc, not in memory) in most cases, to avoid rampant temporary files screwing up the logs, but if not I think "/var" is the best bet. "/usr" is not a good idea because I think it's a good idea to mount "/usr" read-only if possible. If you really want to make the distinction between "/tmp" and "/var/tmp" in terms of files being automatically cleared, I suggest that a "temp" filesystem called (for example) "/temp" could have a directory in it called "temporally_temporary" which could be cleared, and: /var/tmp -> /temp /tmp -> /temp/temporally_temporary or, if there is no separate filesystem, a similar: /tmp -> /var/tmp/temporally_temporary -- David Pick To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the messagehome | help
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