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

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Message-ID: <20201019163449.0a3f4675@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 19 Oct 2020 16:34:49 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Kees Cook <keescook@...omium.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, 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;

;)