netdev - Re: [PATCH net-next 03/13] genetlink: introduce split op representation

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Date:   Wed, 19 Oct 2022 12:50:40 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, edumazet@...gle.com,
        pabeni@...hat.com, jiri@...nulli.us, razor@...ckwall.org,
        nicolas.dichtel@...nd.com, gnault@...hat.com,
        jacob.e.keller@...el.com, fw@...len.de, mareklindner@...mailbox.ch,
        sw@...onwunderlich.de, a@...table.cc, sven@...fation.org,
        jiri@...dia.com, nhorman@...driver.com, alex.aring@...il.com,
        stefan@...enfreihafen.org
Subject: Re: [PATCH net-next 03/13] genetlink: introduce split op
 representation

On Wed, 19 Oct 2022 21:36:00 +0200 Johannes Berg wrote:
> > It's used as an output argument here, so that's what initializes it.
> > genl_get_cmd* should always init the split command because in policy
> > dumping we don't care about the errors, we just want the structure
> > to be zeroed if do/dump is not implemented, and we'll skip accordingly.
> > Wiping the 40B just to write all the fields felt... wrong. 
> > Let KASAN catch us if we fail to init something.  
> 
> KASAN doesn't, I think, you'd need KMSAN?

Quite possibly :S  Too many SANs :S