openbsd: implement setuid sandbox

[blackgnezdo]

We currently don't have support for setuid which AFAICT means everything is fuzzed as root.

2018/11/29 13:39:14 setuid sandbox          : support is not implemented in syzkaller

This finds some bugs which would not be reachable by normal users potentially exposing issues which are less important to fix.

@mptre if you don't decide to do it, I will :)

[mptre]

On Thu, Nov 29, 2018 at 03:22:23PM -0800, Greg Steuck wrote: We currently don't have support for setuid which AFAICT means everything is fuzzed as root. ``` 2018/11/29 13:39:14 setuid sandbox : support is not implemented in syzkaller ``` This finds some bugs which would not be reachable by normal users potentially exposing issues which are less important to fix. @mptre if you don't decide to do it, I will :)

Running as root has helped discovering many of the found panics. But you're right, let's try to hit new code paths. Crashes that does not require root privileges is even more interesting from a security perspective. I'm currently working on adding MP-support to kcov and making good progress. Therefore, please proceed if you have time :)