linux-hardening - Re: [PATCH] fm10k: replace deprecated strncpy with strscpy

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Date: Tue, 10 Oct 2023 22:37:08 +0000
From: Justin Stitt <justinstitt@...gle.com>
To: Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] fm10k: replace deprecated strncpy with strscpy

On Tue, Oct 10, 2023 at 07:53:32PM +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.
>
> A suitable replacement is `strscpy` [2] due to the fact that it
> guarantees NUL-termination on the destination buffer without
> unnecessarily NUL-padding.
>
> Other implementations of .*get_drvinfo also use strscpy so this patch
> brings fm10k_get_drvinfo in line as well:
>
> igb/igb_ethtool.c +851
> static void igb_get_drvinfo(struct net_device *netdev,
>
> igbvf/ethtool.c
> 167:static void igbvf_get_drvinfo(struct net_device *netdev,
>
> i40e/i40e_ethtool.c
> 1999:static void i40e_get_drvinfo(struct net_device *netdev,
>
> e1000/e1000_ethtool.c
> 529:static void e1000_get_drvinfo(struct net_device *netdev,
>
> ixgbevf/ethtool.c
> 211:static void ixgbevf_get_drvinfo(struct net_device *netdev,
>
> 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>
> ---
> Note: build-tested only.
> ---
>  drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c b/drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c
> index d53369e30040..13a05604dcc0 100644
> --- a/drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c
> +++ b/drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c
> @@ -448,10 +448,10 @@ static void fm10k_get_drvinfo(struct net_device *dev,
>  {
>  	struct fm10k_intfc *interface = netdev_priv(dev);
>
> -	strncpy(info->driver, fm10k_driver_name,
> -		sizeof(info->driver) - 1);
> -	strncpy(info->bus_info, pci_name(interface->pdev),
> -		sizeof(info->bus_info) - 1);
> +	strscpy(info->driver, fm10k_driver_name,
> +		sizeof(info->driver));
> +	strscpy(info->bus_info, pci_name(interface->pdev),
> +		sizeof(info->bus_info));
>  }
>
>  static void fm10k_get_pauseparam(struct net_device *dev,
>
> ---
> base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
> change-id: 20231010-strncpy-drivers-net-ethernet-intel-fm10k-fm10k_ethtool-c-8184ea77861f
>
> Best regards,
> --
> Justin Stitt <justinstitt@...gle.com>
>
Hi, this patch was bundled up with some others. It has a new home:

https://lore.kernel.org/all/20231010-netdev-replace-strncpy-resend-as-series-v1-0-caf9f0f2f021@google.com/