linux-kernel - Re: [RFC PATCH] string.h: Add stracpy/stracpy_pad (was: Re: [PATCH] checkpatch: Added warnings in favor of strscpy().)

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Message-ID: <207e201cb7a36e38f032bcb66e79e2d4b9b63c7b.camel@perches.com>
Date:   Mon, 22 Jul 2019 11:35:33 -0700
From:   Joe Perches <joe@...ches.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Nitin Gote <nitin.r.gote@...el.com>, akpm@...ux-foundation.org,
        corbet@....net, apw@...onical.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com,
        Rasmus Villemoes <rasmus.villemoes@...vas.dk>
Subject: Re: [RFC PATCH] string.h: Add stracpy/stracpy_pad (was: Re: [PATCH]
 checkpatch: Added warnings in favor of strscpy().)

On Mon, 2019-07-22 at 11:27 -0700, Matthew Wilcox wrote:
> On Mon, Jul 22, 2019 at 10:58:15AM -0700, Joe Perches wrote:
> > On Mon, 2019-07-22 at 10:43 -0700, Joe Perches wrote:
> > > On Mon, 2019-07-22 at 10:33 -0700, Kees Cook wrote:
> > > > On Thu, Jul 04, 2019 at 05:15:57PM -0700, Joe Perches wrote:
> > > > > On Thu, 2019-07-04 at 13:46 -0700, Joe Perches wrote:
[]
> > > > > +#define stracpy(to, from)					\
> > > > > +({								\
> > > > > +	size_t size = ARRAY_SIZE(to);				\
> > > > > +	BUILD_BUG_ON(!__same_type(typeof(*to), char));		\
> > > > > +								\
> > > > > +	strscpy(to, from, size);				\
> > > > > +})
> 
> Where does the 'a' in 'stracpy' come from?

No place in particular.

I used it because dst has to be an 'a'rray rather
than a pointer.