netdev - Re: [PATCH net-next v2 0/7] ethtool: allow dumping policies to user space

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Message-ID: <20201007083345.GW1874917@unreal>
Date:   Wed, 7 Oct 2020 11:33:45 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     David Miller <davem@...emloft.net>, kuba@...nel.org,
        netdev@...r.kernel.org, kernel-team@...com, jiri@...nulli.us,
        andrew@...n.ch, mkubecek@...e.cz,
        Saeed Mahameed <saeedm@...dia.com>
Subject: Re: [PATCH net-next v2 0/7] ethtool: allow dumping policies to user
 space

On Wed, Oct 07, 2020 at 10:29:01AM +0200, Johannes Berg wrote:
> On Wed, 2020-10-07 at 11:24 +0300, Leon Romanovsky wrote:
> > On Wed, Oct 07, 2020 at 09:30:51AM +0200, Johannes Berg wrote:
> > > On Wed, 2020-10-07 at 09:27 +0300, Leon Romanovsky wrote:
> > > > This series and my guess that it comes from ff419afa4310 ("ethtool: trim policy tables")
> > > > generates the following KASAN out-of-bound error.
> > >
> > > Interesting. I guess that is
> > >
> > > 	req_info->counts_only = tb[ETHTOOL_A_STRSET_COUNTS_ONLY];
> > >
> > > which basically means that before you never actually *use* the
> > > ETHTOOL_A_STRSET_COUNTS_ONLY flag, but of course it shouldn't be doing
> > > this ...
> > >
> > > Does this fix it?
> >
> > Yes, it fixed KASAN, but it we got new failure after that.
>
> Good.
>
> I'm not very familiar with ethtool netlink tbh :)
>
> > 11:07:51 player_id: 1 shell.py:62 [LinuxEthtoolAgent] DEBUG : running command(/opt/mellanox/ethtool/sbin/ethtool --set-channels eth2 combined 3) with pid: 13409
> > 11:07:51 player_id: 1 protocol.py:605 [OpSetChannels] ERROR : RC:1, STDERR:
> > netlink error: Unknown attribute type (offset 36)
> > netlink error: Invalid argument
>
> That's even stranger, since strict validation should've meant this was
> always rejected? Hmm.
>
> Oh, copy/paste error I guess, try this:

I'm trying it now and will update in the next hour.

Thanks