From owner-freebsd-questions Sat Apr 10 0:16:59 1999 Delivered-To: freebsd-questions@freebsd.org Received: from xkis.kis.ru (xkis.kis.ru [195.98.32.200]) by hub.freebsd.org (Postfix) with ESMTP id 2BE9514DCC; Sat, 10 Apr 1999 00:16:55 -0700 (PDT) (envelope-from dv@dv.ru) Received: from localhost (dv@localhost) by xkis.kis.ru (8.9.3/8.9.0) with SMTP id LAA09722; Sat, 10 Apr 1999 11:14:37 +0400 (MSD) Date: Sat, 10 Apr 1999 11:14:37 +0400 (MSD) From: Dmitry Valdov X-Sender: dv@xkis.kis.ru To: chris@calldei.com Cc: freebsd-current@FreeBSD.ORG, freebsd-questions@FreeBSD.ORG Subject: Re: DoS from local users (fwd) In-Reply-To: <19990410020533.A8083@holly.dyndns.org> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Sat, 10 Apr 1999, Chris Costello wrote: > Date: Sat, 10 Apr 1999 02:05:33 -0500 > From: Chris Costello > Reply-To: chris@calldei.com > To: Dmitry Valdov > Cc: freebsd-current@FreeBSD.ORG, freebsd-questions@FreeBSD.ORG > Subject: Re: DoS from local users (fwd) > > On Sat, Apr 10, 1999, Dmitry Valdov wrote: > > > You typically want to set a restriction as to how many > > > processes a user can spawn. This is done by editing > > > /etc/login.conf and changing the user's login class, see the man > > > page for 'login.conf'. > > > > > > > I'm about CPU usage, not about many processes. > > See: > > CPU states: 17.8% user, 0.0% nice, 81.7% system, 0.5% interrupt, 0.0% > > idle > > on any (tested on P2-45) machine. > > > > CPU is used by SYSTEM, not by USER. So I can't restrict it with login.conf > > And load average can be up to 20-40 :( > > > > Please don't redirect me to -questions, it's a kernel problem, not just > > config. > > How is it a kernel problem? It's a forkbomb. It spawns many > processes. You can also limit CPU usage with login.conf, I > believe. Hmm. How I can limit CPU usage by SYSTEM? See top's output below. Dmitry. PS. I've just tried it. And I'm right - CPU usage limit can't help. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message