Re: [PATCH net-next] net: ethtool: Fix out-of-bounds copy to user

[Ding Hui]

On 2023/6/10 1:59, Alexander Duyck wrote:
> On Fri, Jun 9, 2023 at 10:13 AM Jakub Kicinski <kuba@xxxxxxxxxx> wrote:
> > On Fri, 9 Jun 2023 23:25:34 +0800 Ding Hui wrote:
> > > drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c: .get_sset_count         = nfp_net_get_sset_count,
> > > drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c: .get_sset_count         = nfp_port_get_sset_count,
> >
> > Not sure if your research is accurate, NFP does not change the number
> > of stats. The number depends on the device and the FW loaded, but those
> > are constant during a lifetime of a netdevice.

Sorry, my research is rough indeed.

> Yeah, the value doesn't need to be a constant, it just need to be constant.
>
> So for example in the ixgbe driver I believe we were using the upper
> limits on the Tx and Rx queues which last I recall are stored in the
> netdev itself.
Thanks to point that, the examples NFP and ixgbe do help me.
           
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Thanks,
-dinghui