Re: [PATCH] bpf: validate bpf_func when BPF_JIT is enabled

[Sami Tolvanen]

On Thu, Sep 12, 2019 at 3:52 AM Toke HÃiland-JÃrgensen <toke@xxxxxxxxxx> wrote:
> I think it would be good if you do both. I'm a bit worried that XDP
> performance will end up in a "death by a thousand paper cuts" situation,
> so I'd rather push back on even relatively small overheads like this; so
> being able to turn it off in the config would be good.

OK, thanks for the feedback. In that case, I think it's probably
better to wait until we have CFI ready for upstreaming and use the
same config for this one.

> Can you share more details about what the "future CFI checking" is
> likely to look like?

Sure, I posted an overview of CFI and what we're doing in Pixel devices here:

https://android-developers.googleblog.com/2018/10/control-flow-integrity-in-android-kernel.html

Sami