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Re: [PATCH 1/3] x86/pv: Don't deliver #GP for a SYSENTER with NT set

To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
From: Jan Beulich <jbeulich@xxxxxxxx>
Date: Thu, 24 Sep 2020 15:55:40 +0200
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>
Delivery-date: Thu, 24 Sep 2020 13:55:51 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 23.09.2020 12:18, Andrew Cooper wrote:
> It is a matter of guest kernel policy what to do with offending userspace, and
> terminating said userspace may not be the action chosen.
> 
> Linux explicitly tolerates this case.
> 
> Reported-by: Andy Lutomirski <luto@xxxxxxxxxx>
> Fixes: fdac951560 ("x86: clear EFLAGS.NT in SYSENTER entry path")
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>

References:
- [PATCH 0/3] x86/pv: Multiple fixes to SYSCALL/SYSENTER handling (XSA-339 followup)
  - From: Andrew Cooper
- [PATCH 1/3] x86/pv: Don't deliver #GP for a SYSENTER with NT set
  - From: Andrew Cooper

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