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Date: Tue, 12 Jan 2010 08:59:27 +0100 From: Pavel Machek <pavel@....cz> To: Valdis.Kletnieks@...edu Cc: Michael Stone <michael@...top.org>, James Morris <jmorris@...ei.org>, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, linux-security-module@...r.kernel.org, Andi Kleen <andi@...stfloor.org>, David Lang <david@...g.hm>, Oliver Hartkopp <socketcan@...tkopp.net>, Alan Cox <alan@...rguk.ukuu.org.uk>, Herbert Xu <herbert@...dor.apana.org.au>, Bryan Donlan <bdonlan@...il.com>, Evgeniy Polyakov <zbr@...emap.net>, "C. Scott Ananian" <cscott@...ott.net>, "Eric W. Biederman" <ebiederm@...ssion.com>, Bernie Innocenti <bernie@...ewiz.org>, Mark Seaborn <mrs@...hic-beasts.com>, Randy Dunlap <randy.dunlap@...cle.com>, Am?rico Wang <xiyou.wangcong@...il.com>, Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>, Samir Bellabes <sam@...ack.fr>, Casey Schaufler <casey@...aufler-ca.com>, "Serge E. Hallyn" <serue@...ibm.com>, Al Viro <viro@...IV.linux.org.uk> Subject: Re: [PATCH 2/3] Security: Implement disablenetwork semantics. (v4) > On Sun, 10 Jan 2010 22:58:48 +0100, Pavel Machek said: > > > Scenario 2: > > > > Mallory calls disablenetwork, calls sendmail as the first user after > > boot; sendmail can't deliver anything (its network is disabled), but > > starts forking and taking requests for other users, DoSing the mail > > delivery. > > You need to be root to start sendmail as a daemon. Well, maybe, but mailer system where first user starts is as a daemon makes sense... same for authentication system, etc. And it was okay before disablenetwork come. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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