Messages in this thread | | | Date | Wed, 2 Mar 2022 14:49:08 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH v2 18/39] x86/ibt: Add IBT feature, MSR and #CP handling |
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On Wed, Mar 02, 2022 at 01:59:46AM +0000, Edgecombe, Rick P wrote: > As for pinning strength, I'm not understanding this kexec asm enough to > say for sure how much better it is than just removing the bit from the > pinning mask. I think some future hardening around preventing turning > off IBT might still be worthwhile. > > Kees, I think you brought up the pinning, what do you think of this?
IIRC the whole purpose of that was to ensure that the cr4_update_irqsoff() function itself isn't a useful gadget to manipulate CR4 with.
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