Re: MPK: removing a pkey

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On 11/22/2017 04:15 AM, Florian Weimer wrote:
> On 11/22/2017 09:18 AM, Vlastimil Babka wrote:
>> And, was the pkey == -1 internal wiring supposed to be exposed to the
>> pkey_mprotect() signal, or should there have been a pre-check returning
>> EINVAL in SYSCALL_DEFINE4(pkey_mprotect), before calling
>> do_mprotect_pkey())? I assume it's too late to change it now anyway (or
>> not?), so should we also document it?
> 
> I think the -1 case to the set the default key is useful because it
> allows you to use a key value of -1 to mean “MPK is not supported”, and
> still call pkey_mprotect.

The behavior to not allow 0 to be set was unintentional and is a bug.
We should fix that.

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