linux-hardening - Re: [PATCH] m68k/atari: Replace strlcpy with strscpy

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Date:   Mon, 4 Sep 2023 11:29:20 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Azeem Shaikh <azeemshaikh38@...il.com>
Cc:     linux-hardening@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] m68k/atari: Replace strlcpy with strscpy

On Wed, Aug 30, 2023 at 8:54 PM Azeem Shaikh <azeemshaikh38@...il.com> wrote:
> strlcpy() reads the entire source buffer first.
> This read may exceed the destination size limit.
> This is both inefficient and can lead to linear read
> overflows if a source string is not NUL-terminated [1].
> In an effort to remove strlcpy() completely [2], replace
> strlcpy() here with strscpy().
>
> Direct replacement is safe here since return value of -errno
> is used to check for truncation instead of sizeof(dest).
>
> [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
> [2] https://github.com/KSPP/linux/issues/89
>
> Signed-off-by: Azeem Shaikh <azeemshaikh38@...il.com>

Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>
i.e. will queue in the m68k for-v6.7 branch.

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