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

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Message-ID: <98787c53f0577952be3f0ec0f7e58d618a165c33.camel@perches.com>
Date:   Thu, 27 Aug 2020 12:37:03 -0700
From:   Joe Perches <joe@...ches.com>
To:     Kees Cook <keescook@...omium.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     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, 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/