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Message-ID: <202310042152.C8A84D30@keescook>
Date: Wed, 4 Oct 2023 21:53:13 -0700
From: Kees Cook <keescook@...omium.org>
To: Justin Stitt <justinstitt@...gle.com>
Cc: Shay Agroskin <shayagr@...zon.com>,
Arthur Kiyanovski <akiyano@...zon.com>,
David Arinzon <darinzon@...zon.com>, Noam Dagan <ndagan@...zon.com>,
Saeed Bishara <saeedb@...zon.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-hardening@...r.kernel.org
Subject: Re: [PATCH] net: ena: replace deprecated strncpy with strscpy
On Thu, Oct 05, 2023 at 12:56:08AM +0000, Justin Stitt wrote:
> `strncpy` is deprecated for use on NUL-terminated destination strings
> [1] and as such we should prefer more robust and less ambiguous string
> interfaces.
>
> NUL-padding is not necessary as host_info is initialized to
> `ena_dev->host_attr.host_info` which is ultimately zero-initialized via
> alloc_etherdev_mq().
>
> A suitable replacement is `strscpy` [2] due to the fact that it
> guarantees NUL-termination on the destination buffer without
> unnecessarily NUL-padding.
>
> 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>
Looks right to me. Length nicely adjusted. :)
Reviewed-by: Kees Cook <keescook@...omium.org>
--
Kees Cook
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