Re: [PATCH RFC v4 net-next 01/26] net: filter: add "load 64-bit immediate" eBPF instruction

From: H. Peter Anvin
Date: Wed Aug 13 2014 - 17:28:01 EST

On 08/13/2014 02:23 PM, Andy Lutomirski wrote:
> On Wed, Aug 13, 2014 at 2:21 PM, H. Peter Anvin <hpa@xxxxxxxxx> 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.


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