linux-kernel - Re: Fork Bombing Patch

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Message-ID: <m3lkcbu3ps.fsf@maximus.localdomain>
Date:	Thu, 16 Aug 2007 13:19:11 +0200
From:	Krzysztof Halasa <khc@...waw.pl>
To:	"Anand Jahagirdar" <anandjigar@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Fork Bombing Patch

"Anand Jahagirdar" <anandjigar@...il.com> writes:

> +++ linux-2.6.17/kernel/fork.c
> +        /*
> +         * following code does not allow Non Root User to cross its process
> +         * limit and it alerts administrator about user Nearing the process limit.
> +         */
> + 
>        	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_WARNING "User with uid %u is Nearing the process limit\n",p->user->uid);
> +
>  			 goto bad_fork_free;

At least make that configurable - on some systems users are allowed
50 processes or so and I'm sure admins don't really want to know
which particular users are currently close to limits.

I don't really find the above useful. Perhaps we should warn when users
try to write to R/O files or execute root-only commands etc?
-- 
Krzysztof Halasa
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