linux-kernel - Re: [PATCH v3 0/3] KVM: x86: Out-of-bounds access in kvm_recalculate_phys

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Message-ID: <169102013519.1831058.15796555141707320249.b4-ty@google.com>
Date:   Wed,  2 Aug 2023 17:04:20 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Michal Luczaj <mhal@...x.co>
Subject: Re: [PATCH v3 0/3] KVM: x86: Out-of-bounds access in kvm_recalculate_phys_map()

On Fri, 02 Jun 2023 16:32:47 -0700, Sean Christopherson wrote:
> In Michal's words...
> 
> kvm_recalculate_apic_map() creates the APIC map iterating over the list of
> vCPUs twice. First to find the max APIC ID and allocate a max-sized buffer,
> then again, calling kvm_recalculate_phys_map() for each vCPU. This opens a
> race window: value of max APIC ID can increase _after_ the buffer was
> allocated.
> 
> [...]

Applied patch 2 with fixup for the typo to kvm-x86 misc.  Note, patches 1 and 3
went into 6.5.

[2/3] KVM: x86: Retry APIC optimized map recalc if vCPU is added/enabled
      https://github.com/kvm-x86/linux/commit/41e90a69a49b

--
https://github.com/kvm-x86/linux/tree/next
https://github.com/kvm-x86/linux/tree/fixes