Re: [PATCH RFC net-next 08/14] bpf: add eBPF verifier
From: Andy Lutomirski <luto@amacapital.net>
Date: 2014-06-29 01:59:13
Also in:
linux-api, lkml
On Sat, Jun 28, 2014 at 1:25 PM, Alexei Starovoitov [off-list ref] wrote:
On Sat, Jun 28, 2014 at 9:01 AM, Andy Lutomirski [off-list ref] wrote:quoted
On Fri, Jun 27, 2014 at 5:06 PM, Alexei Starovoitov [off-list ref] wrote:quoted
Safety of eBPF programs is statically determined by the verifier, which detects:This is a very high-level review. I haven't tried to read all the code yet, and this is mostly questions rather than real comments.
These were great questions! I hope I answered them. If not, please continue asking.
I have plenty more questions, but here's one right now: does anything prevent programs from using pointers in comparisons, returning pointers, or otherwise figuring out the value of a pointer? If so, I think it would be worthwhile to prevent that so that eBPF programs can't learn kernel addresses. --Andy