An additional benefit of Linux's Page Table Isolation features is that it emulates SMEP for pre-SMEP hardware. Only a bit more work to emulate SMAP too! https://outflux.net/blog/archives/2018/01/04/smep-emulation-in-pti/ …
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never said you did. however you should then also know that PTI is missing key infrastructure that makes it impossible implement UDEREF.
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