From owner-freebsd-security Sun Feb 3 16:53:13 2002 Delivered-To: freebsd-security@freebsd.org Received: from patrocles.silby.com (d45.as3.nwbl0.wi.voyager.net [169.207.92.173]) by hub.freebsd.org (Postfix) with ESMTP id 4230037B41D for ; Sun, 3 Feb 2002 16:53:07 -0800 (PST) Received: from localhost (silby@localhost) by patrocles.silby.com (8.11.6/8.11.6) with ESMTP id g13IuBg12763; Sun, 3 Feb 2002 18:56:24 GMT (envelope-from silby@silby.com) X-Authentication-Warning: patrocles.silby.com: silby owned process doing -bs Date: Sun, 3 Feb 2002 18:56:10 +0000 (GMT) From: Mike Silbersack To: Jason Stone Cc: freebsd-security@freebsd.org Subject: Re: crashs on 4.5RC In-Reply-To: <20020203143638.N6370-100000@walter> Message-ID: <20020203185219.P11305-100000@patrocles.silby.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org On Sun, 3 Feb 2002, Jason Stone wrote: > The last messages in my logs before the box went down were: > > Feb 2 11:47:28 walter /kernel: m_retry failed, consider increase mbuf value > Feb 2 11:47:28 walter /kernel: m_retryhdr failed, consider increase mbuf value > Feb 2 11:47:29 walter /kernel: fxp0: mbuf allocation failed, packet dropped! > Feb 2 11:47:29 walter last message repeated 15 times > > So my question is, is it possible to panic and crash a FreeBSD box by > overflowing its nmbclusters? > > -Jason In theory, no. However, if there's a piece of code which doesn't expect to have mbuf allocations ever fail, then a panic and crash could very well occur. Also, network connections failing could cause a userland app to start acting really strange. So, we'd need more information to really know. Mike "Silby" Silbersack To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message