[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <53EBD848.1060203@zytor.com>
Date: Wed, 13 Aug 2014 14:27:36 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: Andy Lutomirski <luto@...capital.net>
CC: Alexei Starovoitov <ast@...mgrid.com>,
"David S. Miller" <davem@...emloft.net>,
Ingo Molnar <mingo@...nel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Steven Rostedt <rostedt@...dmis.org>,
Daniel Borkmann <dborkman@...hat.com>,
Chema Gonzalez <chema@...gle.com>,
Eric Dumazet <edumazet@...gle.com>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Andrew Morton <akpm@...ux-foundation.org>,
Kees Cook <keescook@...omium.org>,
Linux API <linux-api@...r.kernel.org>,
Network Development <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC v4 net-next 01/26] net: filter: add "load 64-bit immediate"
eBPF instruction
On 08/13/2014 02:23 PM, Andy Lutomirski wrote:
> On Wed, Aug 13, 2014 at 2:21 PM, H. Peter Anvin <hpa@...or.com> wrote:
>> One thing about this that may be a serious concern: allowing the user to
>> control 8 contiguous bytes of kernel memory may be a security hazard.
>
> I'm confused. What kind of memory? I can control a lot more than 8
> bytes of stack very easily.
>
> Or are you concerned about 8 contiguous bytes of *executable* memory?
>
Yes. Useful for some kinds of ROP custom gadgets.
-hpa
--
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/
Powered by blists - more mailing lists