linux-kernel - Re: [PATCH] um,ethertap: refactor deprecated strncpy

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Message-Id: <169601235586.3007879.13354261591100704778.b4-ty@chromium.org>
Date:   Fri, 29 Sep 2023 11:32:37 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Jason Wang <jasowang@...hat.com>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        Justin Stitt <justinstitt@...gle.com>
Cc:     Kees Cook <keescook@...omium.org>, linux-um@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] um,ethertap: refactor deprecated strncpy

On Mon, 11 Sep 2023 17:52:44 +0000, Justin Stitt wrote:
> `strncpy` is deprecated for use on NUL-terminated destination strings [1].
> 
> `gate_buf` should always be NUL-terminated and does not require
> NUL-padding. It is used as a string arg inside an argv array given to
> `run_helper()`. Due to this, let's use `strscpy` as it guarantees
> NUL-terminated on the destination buffer preventing potential buffer
> overreads [2].
> 
> [...]

Applied to for-next/hardening, thanks!

[1/1] um,ethertap: refactor deprecated strncpy
      https://git.kernel.org/kees/c/d4e178fe19c9

Take care,

-- 
Kees Cook