linux-hardening - Re: [PATCH] drm/display/dp_mst: Replace all non-returning strlcpy with strscpy

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Date:   Mon, 22 May 2023 13:15:16 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Azeem Shaikh <azeemshaikh38@...il.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Jani Nikula <jani.nikula@...el.com>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>, Sam Ravnborg <sam@...nborg.org>,
        Jim Cromie <jim.cromie@...il.com>,
        Khaled Almahallawy <khaled.almahallawy@...el.com>,
        Lyude Paul <lyude@...hat.com>, Wayne Lin <Wayne.Lin@....com>,
        Imre Deak <imre.deak@...el.com>,
        Alex Deucher <alexander.deucher@....com>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/display/dp_mst: Replace all non-returning strlcpy
 with strscpy

On Mon, May 22, 2023 at 03:51:24PM +0000, Azeem Shaikh 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: Kees Cook <keescook@...omium.org>

-- 
Kees Cook