linux-hardening - Re: [PATCH] ARM: Replace all non-returning strlcpy with strscpy

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Date:   Wed, 31 May 2023 15:29:46 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Azeem Shaikh <azeemshaikh38@...il.com>
Cc:     Russell King <linux@...linux.org.uk>,
        linux-hardening@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Amit Daniel Kachhap <amit.kachhap@....com>,
        Ard Biesheuvel <ardb@...nel.org>
Subject: Re: [PATCH] ARM: Replace all non-returning strlcpy with strscpy

On Tue, May 30, 2023 at 5:55 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().
> No return values were used, so direct replacement is safe.
>
> [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: Linus Walleij <linus.walleij@...aro.org>

Please put this into Russell's patch tracker:
https://www.arm.linux.org.uk/developer/patches/

Yours,
Linus Walleij