linux-kernel - Re: [PATCH 0/2] KVM: SVM: Fix a NULL VMSA deref with MOVE_ENC

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Message-ID: <20250604150242.137563-2-pbonzini@redhat.com>
Date: Wed,  4 Jun 2025 11:02:43 -0400
From: Paolo Bonzini <pbonzini@...hat.com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Alexander Potapenko <glider@...gle.com>,
	James Houghton <jthoughton@...gle.com>,
	Peter Gonda <pgonda@...gle.com>,
	Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [PATCH 0/2] KVM: SVM: Fix a NULL VMSA deref with MOVE_ENC_CONTEXT

> Fix a NULL VMSA deref bug (which is probably the tip of the iceberg with
> respect to what all can go wrong) due to a race between KVM_CREATE_VCPU and
> KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM, where a non-SEV-ES vCPU can be created in
> an SEV-ES VM.
>
> Found by running syzkaller on a bare metal SEV-ES host.  C repro below.

Queued, thanks (with EBUSY instead of EINVAL).

Paolo