From: Kees Cook <keescook@chromium.org>
To: Justin Stitt <justinstitt@google.com>
Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>,
David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
linux-hardening@vger.kernel.org
Subject: Re: [PATCH v2] drm/gma500: refactor deprecated strncpy
Date: Sat, 23 Sep 2023 20:01:41 -0700 [thread overview]
Message-ID: <202309232000.E307B49B@keescook> (raw)
In-Reply-To: <20230919-drivers-gpu-drm-gma500-oaktrail_lvds_i2c-c-v2-1-9ebe6983b4cb@google.com>
On Tue, Sep 19, 2023 at 04:41:16AM +0000, Justin Stitt wrote:
> `strncpy` is deprecated for use on NUL-terminated destination strings [1].
>
> We should prefer more robust and less ambiguous string interfaces.
>
> Since `chan->base.name` is expected to be NUL-terminated, a suitable
> replacement is `strscpy` [2] due to the fact that it guarantees
> NUL-termination on the destination buffer without also unnecessarily
> NUL-padding (since `chan` is kzalloc'd already).
>
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
> Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
> Link: https://github.com/KSPP/linux/issues/90
> Cc: linux-hardening@vger.kernel.org
> Signed-off-by: Justin Stitt <justinstitt@google.com>
Thanks, looks good. If a v3 is needed, Subject can be improved to be
"...: Replace strncpy with strscpy".
Reviewed-by: Kees Cook <keescook@chromium.org>
--
Kees Cook
WARNING: multiple messages have this Message-ID (diff)
From: Kees Cook <keescook@chromium.org>
To: Justin Stitt <justinstitt@google.com>
Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-hardening@vger.kernel.org
Subject: Re: [PATCH v2] drm/gma500: refactor deprecated strncpy
Date: Sat, 23 Sep 2023 20:01:41 -0700 [thread overview]
Message-ID: <202309232000.E307B49B@keescook> (raw)
In-Reply-To: <20230919-drivers-gpu-drm-gma500-oaktrail_lvds_i2c-c-v2-1-9ebe6983b4cb@google.com>
On Tue, Sep 19, 2023 at 04:41:16AM +0000, Justin Stitt wrote:
> `strncpy` is deprecated for use on NUL-terminated destination strings [1].
>
> We should prefer more robust and less ambiguous string interfaces.
>
> Since `chan->base.name` is expected to be NUL-terminated, a suitable
> replacement is `strscpy` [2] due to the fact that it guarantees
> NUL-termination on the destination buffer without also unnecessarily
> NUL-padding (since `chan` is kzalloc'd already).
>
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
> Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
> Link: https://github.com/KSPP/linux/issues/90
> Cc: linux-hardening@vger.kernel.org
> Signed-off-by: Justin Stitt <justinstitt@google.com>
Thanks, looks good. If a v3 is needed, Subject can be improved to be
"...: Replace strncpy with strscpy".
Reviewed-by: Kees Cook <keescook@chromium.org>
--
Kees Cook
next prev parent reply other threads:[~2023-09-24 3:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-19 4:41 [PATCH v2] drm/gma500: refactor deprecated strncpy Justin Stitt
2023-09-19 4:41 ` Justin Stitt
2023-09-24 3:01 ` Kees Cook [this message]
2023-09-24 3:01 ` Kees Cook
2023-09-27 10:43 ` Patrik Jakobsson
2023-09-27 10:43 ` Patrik Jakobsson
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