linux-kernel - Re: [PATCH V2] KVM: sev: Fix potential overflow send|recieve_update

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Date:   Wed,  8 Feb 2023 02:07:02 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>, kvm@...r.kernel.org,
        Peter Gonda <pgonda@...gle.com>
Cc:     Andy Nguyen <theflow@...gle.com>,
        Thomas Lendacky <thomas.lendacky@....com>,
        David Rientjes <rientjes@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] KVM: sev: Fix potential overflow send|recieve_update_data

On Tue, 07 Feb 2023 09:13:54 -0800, Peter Gonda wrote:
> KVM_SEV_SEND_UPDATE_DATA and KVM_SEV_RECEIVE_UPDATE_DATA have an integer
> overflow issue. Params.guest_len and offset are both 32bite wide, with a
> large params.guest_len the check to confirm a page boundary is not
> crossed can falsely pass:
> 
>     /* Check if we are crossing the page boundary *
>     offset = params.guest_uaddr & (PAGE_SIZE - 1);
>     if ((params.guest_len + offset > PAGE_SIZE))
> 
> [...]

Applied to kvm-x86 svm, thanks!

[1/1] KVM: sev: Fix potential overflow send|recieve_update_data
      https://github.com/kvm-x86/linux/commit/f94f053aa3a5

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