Re: pkeys: Support setting access rights for signal handlers

On 12/09/2017 10:42 PM, Florian Weimer wrote:

quoted

My only nit with this is whether it is the *right* interface.  The 
signal vs. XSAVE state thing is pretty x86 specific and I doubt
that this will be the last feature that we encounter that needs
special signal behavior.

The interface is not specific to XSAVE.  To generic code, only the
two signal mask manipulation functions are exposed.  And I expect
that we're going to need that for other (non-x86) implementations
because they will have the same issue because the signal handler
behavior will be identical.

Let's check with the other implementation...

Ram, this is a question about the signal handler behavior on POWER.  I
thought you ended up having different behavior in signal handlers than x86.

In any case, I think the question still stands: Do we want this to be
pkeys-only, or build it so that it can be used for MPX and any future
XSAVE features that need non-init values when entering a signal handler.

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