linux-hardening - Re: [PATCH v2 4/4] um: Convert strscpy() usage to 2-argument style

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Message-ID: <CAMuHMdWOKEYvGKRUmii5CqtaM-RAM_4SZC5gds=00+KUYyu+MA@mail.gmail.com>
Date: Mon, 5 Feb 2024 13:50:14 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Kees Cook <keescook@...omium.org>
Cc: Andy Shevchenko <andy@...nel.org>, Richard Weinberger <richard@....at>, linux-um@...ts.infradead.org, 
	Justin Stitt <justinstitt@...gle.com>, Anton Ivanov <anton.ivanov@...bridgegreys.com>, 
	Johannes Berg <johannes@...solutions.net>, 
	Willem de Bruijn <willemdebruijn.kernel@...il.com>, Jason Wang <jasowang@...hat.com>, 
	kernel test robot <lkp@...el.com>, Nathan Chancellor <nathan@...nel.org>, 
	Azeem Shaikh <azeemshaikh38@...il.com>, linux-kernel@...r.kernel.org, 
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 4/4] um: Convert strscpy() usage to 2-argument style

Hi Kees,

On Mon, Feb 5, 2024 at 1:36 PM Kees Cook <keescook@...omium.org> wrote:
> The ARCH=um build has its own idea about strscpy()'s definition. Adjust
> the callers to remove the redundant sizeof() arguments ahead of treewide
> changes, since it needs a manual adjustment for the newly named
> sized_strscpy() export.
>
> Cc: Richard Weinberger <richard@....at>
> Cc: linux-um@...ts.infradead.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Thanks for your patch!

> --- a/arch/um/include/shared/user.h
> +++ b/arch/um/include/shared/user.h
> @@ -52,7 +52,7 @@ static inline int printk(const char *fmt, ...)
>  extern int in_aton(char *str);
>  extern size_t strlcat(char *, const char *, size_t);
>  extern size_t sized_strscpy(char *, const char *, size_t);
> -#define strscpy(dst, src, size)        sized_strscpy(dst, src, size)
> +#define strscpy(dst, src)      sized_strscpy(dst, src, sizeof(dst))

(dst), (src)

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