Re: pkeys: Support setting access rights for signal handlers

On 12/16/2017 06:20 PM, Ram Pai wrote:

Ok. Sounds like I do not have much to do. My patches in its current form
will continue to work and provide the semantics you envision.

Thanks for confirming.

quoted

I'm open to a different way towards conveying this information to
userspace.  I don't want to probe for the behavior by sending a
signal because that is quite involved and would also be visible in
debuggers, confusing programmers.

I am fine with your proposal.

So how can we move this forward?  Should I submit a single new patch 
with the new flag with a more appropriate name (PKEY_ALLOC_SIGNALINHERIT 
comes to my mind) and the signal inheritance change?

Dave, do you still want to wait for feedback from the x86 maintainer 
regarding a general interface?  Is this really feasible without detailed 
knowledge of the XSAVE output structure?  Otherwise, there probably 
isn't a way around code which explicitly copies the bits we want to 
preserve from the interrupted CPU context to the signal handler context.

Thanks,
Florian