linux-kernel - RE: [PATCH v2] net: ena: replace deprecated strncpy with strscpy

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Message-ID: <6a877c080404447c8f715c614b276bef@amazon.com>
Date:   Thu, 7 Dec 2023 21:48:23 +0000
From:   "Kiyanovski, Arthur" <akiyano@...zon.com>
To:     "justinstitt@...gle.com" <justinstitt@...gle.com>,
        "Agroskin, Shay" <shayagr@...zon.com>,
        "Arinzon, David" <darinzon@...zon.com>,
        "Dagan, Noam" <ndagan@...zon.com>,
        "Bshara, Saeed" <saeedb@...zon.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>
Subject: RE: [PATCH v2] net: ena: replace deprecated strncpy with strscpy

> -----Original Message-----
> From: justinstitt@...gle.com <justinstitt@...gle.com>
> 
> `strncpy` is deprecated for use on NUL-terminated destination strings [1] and as
> such we should prefer more robust and less ambiguous string interfaces.
> 
> A suitable replacement is `strscpy` [2] due to the fact that it guarantees NUL-
> termination on the destination buffer without unnecessarily NUL-padding.
> 
> host_info allocation is done in ena_com_allocate_host_info() via
> dma_alloc_coherent() and is not zero initialized by alloc_etherdev_mq().
> 
> However zero initialization of the destination doesn't matter in this case,
> because strscpy() guarantees a NULL termination.
> 
> 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>
> ---
> Changes in v2:
> - update commit message, dropping inaccurate statement about allocation
>   (thanks Arthur)
> - copy/paste Arthur's explanation regarding host_info allocation into
> - rebased onto mainline
> - Link to v1: https://lore.kernel.org/r/20231005-strncpy-drivers-net-ethernet-
> amazon-ena-ena_netdev-c-v1-1-ba4879974160@...gle.com
> ---
> Note: build-tested only.
> ---
>  ..................
> Best regards,
> --
> Justin Stitt <justinstitt@...gle.com>

Thanks for making the necessary changes to the commit message Justin.
Looks good.

Acked-by: Arthur Kiyanovski <akiyano@...zon.com>