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

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Message-ID: <202010201019.7BFEC3D@keescook>
Date:   Tue, 20 Oct 2020 10:19:52 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     laniel_francis@...vacyrequired.com,
        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.

On Mon, Oct 19, 2020 at 04:34:49PM -0700, Jakub Kicinski wrote:
> 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;
> 
> ;)

Oops, sorry, yes. ENOCOFFEE on my end. :)

-- 
Kees Cook