linux-kernel - Re: [PATCH] lib/string.c: Clarify kerndoc for stpcpy()

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Date:   Sun, 6 Sep 2020 12:08:09 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Kees Cook <keescook@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Joe Perches <joe@...ches.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Yury Norov <yury.norov@...il.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lib/string.c: Clarify kerndoc for stpcpy()

On Sun, Sep 06, 2020 at 03:06:29AM -0700, Kees Cook wrote:
> Fix the language around return values to indicate destination instead of
> source.
> 
> Reported-by: Masahiro Yamada <masahiroy@...nel.org>
> Link: https://lore.kernel.org/lkml/CAK7LNAQvQBhjYgSkvm-dVyNz2Jd2C2qAtfyRk-rngEDfjkc38g
> Cc: Nick Desaulniers <ndesaulniers@...gle.com>
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
> This is a fix for lib-stringc-implement-stpcpy.patch in -mm.
> 
> Andrew, please note that it would be nice to get this into -rc6
> to unbreak the clang builds.
> 
> Thanks!
> ---
>  lib/string.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/lib/string.c b/lib/string.c
> index 6bd0cf0fb009..32a56436c7eb 100644
> --- a/lib/string.c
> +++ b/lib/string.c
> @@ -280,12 +280,12 @@ EXPORT_SYMBOL(strscpy_pad);
>   * @src: pointer to the beginning of string being copied from. Must not overlap
>   *       dest.
>   *
> - * stpcpy differs from strcpy in a key way: the return value is the new
> - * %NUL-terminated character. (for strcpy, the return value is a pointer to
> - * src. This interface is considered unsafe as it doesn't perform bounds
> - * checking of the inputs. As such it's not recommended for usage. Instead,
> - * its definition is provided in case the compiler lowers other libcalls to
> - * stpcpy.
> + * stpcpy differs from strcpy in a key way: the return value is a pointer
> + * to the new %NUL-terminated character in @dest. (For strcpy, the return
> + * value is a pointer to the start of @dest. This interface is considered
					      ^ need closing parenthesis

Thanks.