linux-kernel - Re: Patch related with Fork Bobmbing Attack

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Date:	Wed, 13 Jun 2007 12:34:09 +0100
From:	"Simon Arlott" <simon@...e.lp0.eu>
To:	"Jan Engelhardt" <jengelh@...putergmbh.de>
Cc:	"Roland Dreier" <rdreier@...co.com>,
	"Anand Jahagirdar" <anandjigar@...il.com>,
	linux-kernel@...r.kernel.org, security@...nel.org,
	"Andrew Morton" <akpm@...ux-foundation.org>, akpm@...eo.com,
	"Daniel Hazelton" <dhazelton@...er.net>,
	"Jens Axboe" <jens.axboe@...cle.com>,
	"Jiri Kosina" <jikos@...os.cz>
Subject: Re: Patch related with Fork Bobmbing Attack

On Tue, June 12, 2007 18:32, Jan Engelhardt wrote:
> On Jun 12 2007 10:04, Roland Dreier wrote:
>> > +	/*
>> > +         * following code does not allow Non Root User to cross its process
>> > +         * limit. it alerts administrator about fork bombing attack and prevents
>> > +         * it.
>> > +         */
>> >  	if (atomic_read(&p->user->processes) >= p->signal->rlim[RLIMIT_NPROC].rlim_cur)
>> >  		if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RESOURCE) &&
>> > -				p->user != &root_user)
>> > -
>> > +				p->user != &root_user) {
>> > +			if (printk_ratelimit())
>> > +                                printk(KERN_CRIT"User with uid %d is crossing its process
>> limit\n",p->user->uid);
>> >  			goto bad_fork_free;
>> > +		}

Why does this need to be KERN_CRIT? You can't assume that every time a process limit is reached that it's a
fork bomb.

-- 
Simon Arlott
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