linux-kernel - Re: [PATCH 2/3] string: provide strscpy() and strscpy

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Message-ID: <CAMuHMdUuaRGn10_k+Gm7vG5P_=QfSw7Mao3oB_u2Poy=PeiGtg@mail.gmail.com>
Date:	Wed, 6 May 2015 18:45:56 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Chris Metcalf <cmetcalf@...hip.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Fabian Frederick <fabf@...net.be>,
	Randy Dunlap <rdunlap@...radead.org>,
	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	Greg KH <gregkh@...uxfoundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"David S. Miller" <davem@...emloft.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sam Ravnborg <sam@...nborg.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	"Theodore Ts'o" <tytso@....edu>,
	Grant Likely <grant.likely@...aro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH 2/3] string: provide strscpy() and strscpy_truncate()

On Wed, May 6, 2015 at 5:59 PM, Dan Carpenter <dan.carpenter@...cle.com> wrote:
> We actually do have a __must_check tag so it's easy enough to force
> people to check.  A different option is we could make it trigger a

People tend to ignore compiler warnings...

> WARN_ONCE().
>
> #define strXcpy(dest, src, len) (({                             \
>         ssize_t __ret = strscpy_truncate(dest, src, len);       \
>         WARN_ONCE(__ret < 0, "strXcpy trancates\n");            \
>         __ret; }))

Which will probably trigger only in extreme cases in the wild, not during
development.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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