linux-kernel - Re: Fork Bombing Patch

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Message-ID: <25ae38200708200726tdf097b1kcd0269cf11c53bf3@mail.gmail.com>
Date:	Mon, 20 Aug 2007 19:56:00 +0530
From:	"Anand Jahagirdar" <anandjigar@...il.com>
To:	"Krzysztof Halasa" <khc@...waw.pl>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Fork Bombing Patch

Hi
  I think Its not worth to make it configurable just for one printk
statement. am i missing something?

anand

On 8/16/07, Krzysztof Halasa <khc@...waw.pl> wrote:
> "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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