Re: [PATCH net 0/2] vsock/virtio: fix MSG_PEEK calculation on bytes to copy

[Michael S. Tsirkin]

On Thu, Apr 02, 2026 at 10:18:00AM +0200, Luigi Leonardi wrote:
> `virtio_transport_stream_do_peek`, when calculating the number of bytes to copy,
> didn't consider the `offset`, caused by partial reads that happend before.
> This might cause out-of-bounds read that lead to an EFAULT.
> More details in the commit.
> 
> Commit 1 introduces the fix
> Commit 2 introduces a test that checks for this bug to avoid future
> regressions.
> 
> Signed-off-by: Luigi Leonardi <leonardi@xxxxxxxxxx>

Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>

> ---
> Luigi Leonardi (2):
>       vsock/virtio: fix MSG_PEEK ignoring skb offset when calculating bytes to copy
>       vsock/test: add MSG_PEEK after partial recv test
> 
>  net/vmw_vsock/virtio_transport_common.c |  5 ++-
>  tools/testing/vsock/vsock_test.c        | 64 +++++++++++++++++++++++++++++++++
>  2 files changed, 66 insertions(+), 3 deletions(-)
> ---
> base-commit: 9147566d801602c9e7fc7f85e989735735bf38ba
> change-id: 20260401-fix_peek-6837b83469e3
> 
> Best regards,
> -- 
> Luigi Leonardi <leonardi@xxxxxxxxxx>