linux-kernel - Re: [PATCH v17 08/15] seccomp: add system call filtering using BPF

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Date:	Tue, 10 Apr 2012 12:34:34 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Indan Zupancic <indan@....nu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Will Drewry <wad@...omium.org>, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-doc@...r.kernel.org, kernel-hardening@...ts.openwall.com,
	netdev@...r.kernel.org, x86@...nel.org, arnd@...db.de,
	davem@...emloft.net, hpa@...or.com, mingo@...hat.com,
	oleg@...hat.com, peterz@...radead.org, rdunlap@...otime.net,
	mcgrathr@...omium.org, tglx@...utronix.de, luto@....edu,
	eparis@...hat.com, serge.hallyn@...onical.com, djm@...drot.org,
	scarybeasts@...il.com, pmoore@...hat.com, corbet@....net,
	markus@...omium.org, coreyb@...ux.vnet.ibm.com,
	keescook@...omium.org, jmorris@...ei.org
Subject: Re: [PATCH v17 08/15] seccomp: add system call filtering using BPF

On Mon, 2012-04-09 at 04:22 +1000, Indan Zupancic wrote:
> On Sat, April 7, 2012 06:23, Andrew Morton wrote:
> >
> > I think this gives userspace an easy way of causing page allocation
> > failure warnings, by permitting large kmalloc() attempts.  Add
> > __GFP_NOWARN?
> 
> Max is 32kb. sk_attach_filter() in net/core/filter.c is worse,
> it allocates up to 512kb before even checking the length.
> 

I dont think so.

sk_attach_filter() uses sk_malloc() and it does a check.

# cat /proc/sys/net/core/optmem_max 
20480

Of course you can change the limit on your machine.



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