linux-kernel - Re: [PATCH] drm/i915: Replace all non-returning strlcpy with strscpy

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Message-ID: <202305221316.2817AA4FC@keescook>
Date:   Mon, 22 May 2023 13:16:03 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Azeem Shaikh <azeemshaikh38@...il.com>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        linux-hardening@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        John Harrison <John.C.Harrison@...el.com>,
        Matthew Brost <matthew.brost@...el.com>,
        Ashutosh Dixit <ashutosh.dixit@...el.com>,
        Lionel Landwerlin <lionel.g.landwerlin@...el.com>,
        Umesh Nerlige Ramappa <umesh.nerlige.ramappa@...el.com>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/i915: Replace all non-returning strlcpy with strscpy

On Mon, May 22, 2023 at 03:52:28PM +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