linux-kernel - RE: [EXT] Re: [PATCH v2 RESEND 1/1] net: fec: add xdp and page pool statistics

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Message-ID: <PAXPR04MB91853A6A1DDDBB06F33C975E89019@PAXPR04MB9185.eurprd04.prod.outlook.com>
Date:   Thu, 10 Nov 2022 13:29:56 +0000
From:   Shenwei Wang <shenwei.wang@....com>
To:     Paolo Abeni <pabeni@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "imx@...ts.linux.dev" <imx@...ts.linux.dev>
Subject: RE: [EXT] Re: [PATCH v2 RESEND 1/1] net: fec: add xdp and page pool
 statistics



> -----Original Message-----
> From: Paolo Abeni <pabeni@...hat.com>
> Sent: Thursday, November 10, 2022 5:54 AM
> To: Shenwei Wang <shenwei.wang@....com>; David S. Miller
> <davem@...emloft.net>; Eric Dumazet <edumazet@...gle.com>; Jakub
> Kicinski <kuba@...nel.org>
> >       case ETH_SS_STATS:
> > -             for (i = 0; i < ARRAY_SIZE(fec_stats); i++)
> > -                     memcpy(data + i * ETH_GSTRING_LEN,
> > -                             fec_stats[i].name, ETH_GSTRING_LEN);
> > +             for (i = 0; i < ARRAY_SIZE(fec_stats); i++) {
> > +                     memcpy(data, fec_stats[i].name, ETH_GSTRING_LEN);
> > +                     data += ETH_GSTRING_LEN;
> > +             }
> > +             for (i = 0; i < ARRAY_SIZE(fec_xdp_stat_strs); i++) {
> > +                     memcpy(data, fec_xdp_stat_strs[i], ETH_GSTRING_LEN);
> > +                     data += ETH_GSTRING_LEN;
> 
> The above triggers a warning:
> 
> In function ‘fortify_memcpy_chk’,
>     inlined from ‘fec_enet_get_strings’
> at ../drivers/net/ethernet/freescale/fec_main.c:2788:4:
> ../include/linux/fortify-string.h:413:25: warning: call to ‘__read_overflow2_field’
> declared with attribute warning: detected read beyond size of field (2nd
> parameter); maybe use struct_group()? [-Wattribute-warning]
>   413 |                         __read_overflow2_field(q_size_field, size);
>       |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> I think you can address it changing fec_xdp_stat_strs definition to:
> 
> static const char fec_xdp_stat_strs[XDP_STATS_TOTAL][ETH_GSTRING_LEN] =

That does a problem. How about just change the memcpy to strncpy? 

Regards,
Shenwei

> { // ...
> 
> Cheers,
> 
> Paolo