[PATCH v2] audit: report audit wait metric in audit status reply

[Steve Grubb]

On Monday, December 7, 2020 8:34:35 PM EST Richard Guy Briggs wrote:
> On 2020-12-07 18:28, Steve Grubb wrote:
> > Hello Max,
> > 
> > On Monday, December 7, 2020 4:28:14 PM EST Max Englander wrote:
> > > Steve, I'm happy to make changes to the userspace PR based on
> > > Richard's suggestions, if that sounds good to you. I'll follow up in
> > > the PR to discuss it more
> > 
> > The only issue is new userspace on old kernel. I think if we use both the
> > configure macro in addition to a size check, then it will at least allow
> > forward and backward compatibility.
> 
> Are you talking about a new userspace compiled on a new kernel header
> file run on an old kernel?

Yes. This is my worry. Someone compiles the code and the does a roll back. It 
can happen because the new kernel has some problems that a driver cannot 
handle.

> That would be less reliable and need the
> size check.  The bitmap would be the most reliable in that scenario.

Right, but the person that can make that happen doesn't want to use this 
facility for what it was intended for. So, we are all trying to do the best.


> By configure macro are you talking about the presence of that audit
> status mask bit, or the presence of that struct audit_status member?

Yes. But it doesn't apply to old kernels.

-Steve