linux-kernel - Re: [PATCH v3] lib/string.c: implement stpcpy

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Date:   Thu, 27 Aug 2020 12:41:45 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Joe Perches <joe@...ches.com>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        stable <stable@...r.kernel.org>, Andy Lavr <andy.lavr@...il.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        Yury Norov <yury.norov@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] lib/string.c: implement stpcpy

On Thu, Aug 27, 2020 at 12:37:03PM -0700, Joe Perches wrote:
> On Thu, 2020-08-27 at 11:30 -0700, Kees Cook wrote:
> 
> > Most of the uses of strcpy() in the kernel are just copying between two
> > known-at-compile-time NUL-terminated character arrays. We had wanted to
> > introduce stracpy() for this, but Linus objected to yet more string
> > functions.
> 
> https://lore.kernel.org/kernel-hardening/24bb53c57767c1c2a8f266c305a670f7@sk2.org/T/
> 
> I still think stracpy is a good idea.
> 
> Maybe when the strcpy/strlcpy uses are removed
> it'll be more acceptable.
> 
> And here's a cocci script to convert most of them.
> https://lore.kernel.org/kernel-hardening/b9bb5550b264d4b29b2b20f7ff8b1b40d20def6a.camel@perches.com/

Yeah, thanks again for that. Most of this is very mechanical. (strncpy is not, unfortunately)

-- 
Kees Cook