Re: [PATCH 31/32] x86, pkeys: execute-only support

[Dave Hansen]

On 12/14/2015 03:39 PM, Andy Lutomirski wrote:
>> > Nope.  My linker-fu is weak.
>> >
>> > Can we even depend on the linker by itself?  Even if the sections were
>> > marked --x, we can't actually use them with those permissions unless we
>> > have protection keys.
>> >
>> > Do we need some special tag on the section to tell the linker to map it
>> > as --x under some conditions and r-x for others?
>> >
> Why?  Wouldn't --x just end up acting like r-x if PKRU is absent?

An app doing --x would expect it to be unreadable.  I don't think we can
just silently turn it in to r-x.
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