linux-hardening - Re: [PATCH] crypto: qat - refactor deprecated strncpy

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Message-ID: <ZQLfRbnGHXts515P@gcabiddu-mobl1.ger.corp.intel.com>
Date:   Thu, 14 Sep 2023 11:24:05 +0100
From:   Giovanni Cabiddu <giovanni.cabiddu@...el.com>
To:     Justin Stitt <justinstitt@...gle.com>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>, <qat-linux@...el.com>,
        <linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-hardening@...r.kernel.org>
Subject: Re: [PATCH] crypto: qat - refactor deprecated strncpy

On Wed, Sep 13, 2023 at 12:51:05AM +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.
> 
> `buf` is expected to be NUL-terminated for its eventual use in
> `kstrtoul()` and NUL-padding is not required.
> 
> Due to the above, a suitable replacement is `strscpy` [2] due to the
> fact that it guarantees NUL-termination on the destination buffer.
> 
> 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@...r.kernel.org
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>
Acked-by: Giovanni Cabiddu <giovanni.cabiddu@...el.com>

> ---
> Note: build-tested only.
Reviewed and tested on dh895xcc, the only device impacted by this
change. All good.

Thanks,

-- 
Giovanni