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! outflux.net/blog/archives/20…
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this is what UDEREF/amd64 in PaX has been doing for years, you even knew of it not long ago: events.linuxfoundation.org/s… (slides 29/30)
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Never said it didn't. I was commenting on PTI, pointing out a side-effect not everyone was aware of.
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Replying to @kees_cook
never said you did. however you should then also know that PTI is missing key infrastructure that makes it impossible implement UDEREF.

Jan 11, 2018 · 12:35 AM UTC
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