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Message-ID: <CAMEtUuwO028MV8TQXQew1SOQjUvSbQ_bazAqorGRxojXXYXEnA@mail.gmail.com>
Date: Wed, 13 Aug 2014 14:38:23 -0700
From: Alexei Starovoitov <ast@...mgrid.com>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: Andy Lutomirski <luto@...capital.net>,
"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 Wed, Aug 13, 2014 at 2:27 PM, H. Peter Anvin <hpa@...or.com> wrote:
> 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.
I don't get it. What is ROP ?
What is the concern about 8 bytes ?
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