netdev - Re: [PATCH] ionic: replace deprecated strncpy with strscpy

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Date: Wed, 11 Oct 2023 15:17:06 -0700
From: "Nelson, Shannon" <shannon.nelson@....com>
To: Justin Stitt <justinstitt@...gle.com>,
 Brett Creeley <brett.creeley@....com>, drivers@...sando.io,
 "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, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH] ionic: replace deprecated strncpy with strscpy

On 10/11/2023 2:53 PM, 'Justin Stitt' via Pensando Drivers 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 needed due to `ident` being memset'd to 0 just before
> the copy.
> 
> Considering the above, 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>

Thanks, I suspected this was coming soon :-)

Reviewed-by: Shannon Nelson <shannon.nelson@....com>


> ---
> Note: build-tested only.
> 
> Found with: $ rg "strncpy\("
> ---
>   drivers/net/ethernet/pensando/ionic/ionic_main.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/pensando/ionic/ionic_main.c b/drivers/net/ethernet/pensando/ionic/ionic_main.c
> index 1dc79cecc5cc..835577392178 100644
> --- a/drivers/net/ethernet/pensando/ionic/ionic_main.c
> +++ b/drivers/net/ethernet/pensando/ionic/ionic_main.c
> @@ -554,8 +554,8 @@ int ionic_identify(struct ionic *ionic)
>          memset(ident, 0, sizeof(*ident));
> 
>          ident->drv.os_type = cpu_to_le32(IONIC_OS_TYPE_LINUX);
> -       strncpy(ident->drv.driver_ver_str, UTS_RELEASE,
> -               sizeof(ident->drv.driver_ver_str) - 1);
> +       strscpy(ident->drv.driver_ver_str, UTS_RELEASE,
> +               sizeof(ident->drv.driver_ver_str));
> 
>          mutex_lock(&ionic->dev_cmd_lock);
> 
> 
> ---
> base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
> change-id: 20231011-strncpy-drivers-net-ethernet-pensando-ionic-ionic_main-c-709f8f1ea312
> 
> Best regards,
> --
> Justin Stitt <justinstitt@...gle.com>
>