From owner-freebsd-security Wed Sep 1 13:22:21 1999 Delivered-To: freebsd-security@freebsd.org Received: from granite.sentex.net (granite.sentex.ca [199.212.134.1]) by hub.freebsd.org (Postfix) with ESMTP id BA25C14BCF for ; Wed, 1 Sep 1999 13:22:18 -0700 (PDT) (envelope-from mike@sentex.net) Received: from simoeon (simeon.sentex.ca [209.112.4.47]) by granite.sentex.net (8.8.8/8.6.9) with SMTP id QAA18232; Wed, 1 Sep 1999 16:22:11 -0400 (EDT) Message-Id: <3.0.5.32.19990901162052.023c18d0@staff.sentex.ca> X-Sender: mdtpop@staff.sentex.ca X-Mailer: QUALCOMM Windows Eudora Light Version 3.0.5 (32) Date: Wed, 01 Sep 1999 16:20:52 -0400 To: FreeBSD -- The Power to Serve From: Mike Tancsa Subject: Re: FW: Local DoS in FreeBSD Cc: freebsd-security@FreeBSD.ORG In-Reply-To: References: <3.0.5.32.19990901140428.01f197b0@staff.sentex.ca> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org At 02:10 PM 9/1/99 -0600, FreeBSD -- The Power to Serve wrote: >Exactly what I mean! Limit file descriptors, and it also uses a lot of CPU >time so you can limit that too.. It will never crash the system with the >proper limits set :). They can run it all they want. Well, that sort of helps for kids just doing ./a.out, but would you put accounting limits on your web server ? That seems like a nasty can of configuration worms one would be opening no ? ---Mike > >On Wed, 1 Sep 1999, Mike Tancsa wrote: > >> At 11:49 AM 9/1/99 -0600, FreeBSD -- The Power to Serve wrote: >> >If you have public access users, you should have login accounting in the >> >first place.. and yes, it does stop it :).. I verified this on a 3.2 box >> >with my login accounting setup.. >> >> How does accounting stop it ? Or do you mean it just discourages users >> from doing it ? How much overhead does accounting add to the system ? >> Also, limiting the amount of file descriptors can prevent it, as the 'bug' >> is essentially a resource starving issue (e.g. fork bomb) >> >> ---Mike >> ------------------------------------------------------------------------ >> Mike Tancsa, tel 01.519.651.3400 >> Network Administrator, mike@sentex.net >> Sentex Communications www.sentex.net >> Cambridge, Ontario Canada >> >> >> To Unsubscribe: send mail to majordomo@FreeBSD.org >> with "unsubscribe freebsd-security" in the body of the message >> > > > ------------------------------------------------------------------------ Mike Tancsa, tel 01.519.651.3400 Network Administrator, mike@sentex.net Sentex Communications www.sentex.net Cambridge, Ontario Canada To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message