Re: pkeys: Support setting access rights for signal handlers

[Florian Weimer <fweimer@redhat.com>]

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.

>> 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

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