It seems that there is no way to mark a page as exec-only on Linux x86/64 (and arm?). After mprotect(PROT_EXEC) the page is still readable.pic.twitter.com/opUx2epgix
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but as far as I know, no processors with that feature are shipping yet
ARM employs another level of indirection to allow that by default. mpk is already applied in 4.16 with r/w to PKRU
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