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