linux-hardening - Re: [RFC][PATCH v2 2/3] Modify return value of nla

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Date:   Tue, 20 Oct 2020 12:28:49 +0200
From:   Francis Laniel <laniel_francis@...vacyrequired.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>, linux-hardening@...r.kernel.org,
        davem@...emloft.net
Subject: Re: [RFC][PATCH v2 2/3] Modify return value of nla_strlcpy to match that of strscpy.

Le mardi 20 octobre 2020, 01:34:49 CEST Jakub Kicinski a écrit :
> On Mon, 19 Oct 2020 16:01:27 -0700 Kees Cook wrote:
> > On Mon, Oct 19, 2020 at 09:43:55AM -0700, Jakub Kicinski wrote:
> > > On Mon, 19 Oct 2020 17:23:30 +0200 laniel_francis@...vacyrequired.com
> > > 
> > > wrote:
> > > > -size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t
> > > > dstsize)
> > > > +ssize_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t
> > > > dstsize)
> > > > 
> > > >  {
> > > > 
> > > > +	size_t len;
> > > > +	ssize_t ret;
> > > > 
> > > >  	size_t srclen = nla_len(nla);
> > > >  	char *src = nla_data(nla);
> > > 
> > > Sort local variables long to short.
> > 
> > Specifically, "reverse christmas tree":
> >  	size_t srclen = nla_len(nla);
> >  	char *src = nla_data(nla);
> >  	size_t len;
> >  	ssize_t ret;
> 
> Or even
> 
>  	size_t srclen = nla_len(nla);
>  	char *src = nla_data(nla);
>  	ssize_t ret;
>  	size_t len;
> 
> ;)

I reordered the variables names for the v3.
Just to know, is it a new rule? Because scripts/checkpatch.pl did not report 
anything and I was not aware of it.