Re: [PATCH] hw/nvme: fix oob memory read in fdp events log

[Klaus Jensen <its@irrelevant.dk>]

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+CC qemu-stable

On Aug  3 20:44, Klaus Jensen wrote:
> From: Klaus Jensen <k.jensen@samsung.com>
> 
> As reported by Trend Micro's Zero Day Initiative, an oob memory read
> vulnerability exists in nvme_fdp_events(). The host-provided offset is
> not verified.
> 
> Fix this.
> 
> This is only exploitable when Flexible Data Placement mode (fdp=on) is
> enabled.
> 
> Fixes: CVE-2023-4135
> Fixes: 73064edfb864 ("hw/nvme: flexible data placement emulation")
> Reported-by: Trend Micro's Zero Day Initiative
> Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
> ---
>  hw/nvme/ctrl.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
> index f2e5a2fa737b..e9b5a55811b8 100644
> --- a/hw/nvme/ctrl.c
> +++ b/hw/nvme/ctrl.c
> @@ -5120,6 +5120,11 @@ static uint16_t nvme_fdp_events(NvmeCtrl *n, uint32_t endgrpid,
>      }
>  
>      log_size = sizeof(NvmeFdpEventsLog) + ebuf->nelems * sizeof(NvmeFdpEvent);
> +
> +    if (off >= log_size) {
> +        return NVME_INVALID_FIELD | NVME_DNR;
> +    }
> +
>      trans_len = MIN(log_size - off, buf_len);
>      elog = g_malloc0(log_size);
>      elog->num_events = cpu_to_le32(ebuf->nelems);
> -- 
> 2.41.0
> 

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