Re: [PATCH] KVM: x86: Forcibly leave nested virt when SMM state is toggled

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On 2/18/22 10:14, Paolo Bonzini wrote:
On 2/18/22 18:22, Tadeusz Struk wrote:
On 2/18/22 08:58, Sean Christopherson wrote:
This SMM-specific patch fixes something different, the bug that you are still
hitting is the FNAME(cmpxchg_gpte) mess.  The uaccess CMPXCHG series[*] that
properly fixes that issue hasn't been merged yet.

   ==================================================================
   BUG: KASAN: use-after-free in ept_cmpxchg_gpte.constprop.0+0x3c3/0x590
   Write of size 8 at addr ffff888010000000 by task repro/5633

[*]https://lore.kernel.org/all/20220202004945.2540433-1-seanjc@xxxxxxxxxx


Ok, that's good. I will keep an eye on it and give it a try then.

I'll poke PeterZ for a review next week.


Paulo, do you know if PeterZ had a chance to look at the uaccess patches yet?

--
Thanks,
Tadeusz



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