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Message-ID: <oypijd34yp5unl.fsf%l.stelmach@samsung.com>
Date: Thu, 05 Oct 2023 10:40:46 +0200
From: Lukasz Stelmach <l.stelmach@...sung.com>
To: Justin Stitt <justinstitt@...gle.com>
Cc: "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: ax88796c: replace deprecated strncpy with strscpy
It was <2023-10-05 czw 01:06>, when 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.
>
> It should be noted that there doesn't currently exist a bug here as
> DRV_NAME is a small string literal which means no overread bugs are
> present.
>
> Also to note, other ethernet drivers are using strscpy in a similar
> pattern:
> | dec/tulip/tulip_core.c
> | 861: strscpy(info->driver, DRV_NAME, sizeof(info->driver));
> |
> | 8390/ax88796.c
> | 582: strscpy(info->driver, DRV_NAME, sizeof(info->driver));
> |
> | dec/tulip/dmfe.c
> | 1077: strscpy(info->driver, DRV_NAME, sizeof(info->driver));
> |
> | 8390/etherh.c
> | 558: strscpy(info->driver, DRV_NAME, sizeof(info->driver));
>
> 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/asix/ax88796c_ioctl.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
Reviewed-by: Lukasz Stelmach <l.stelmach@...sung.com>
> diff --git a/drivers/net/ethernet/asix/ax88796c_ioctl.c b/drivers/net/ethernet/asix/ax88796c_ioctl.c
> index 916ae380a004..7d2fe2e5af92 100644
> --- a/drivers/net/ethernet/asix/ax88796c_ioctl.c
> +++ b/drivers/net/ethernet/asix/ax88796c_ioctl.c
> @@ -24,7 +24,7 @@ static void
> ax88796c_get_drvinfo(struct net_device *ndev, struct ethtool_drvinfo *info)
> {
> /* Inherit standard device info */
> - strncpy(info->driver, DRV_NAME, sizeof(info->driver));
> + strscpy(info->driver, DRV_NAME, sizeof(info->driver));
> }
>
> static u32 ax88796c_get_msglevel(struct net_device *ndev)
>
> ---
> base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
> change-id: 20231005-strncpy-drivers-net-ethernet-asix-ax88796c_ioctl-c-56af20b7d992
>
> Best regards,
> --
> Justin Stitt <justinstitt@...gle.com>
>
>
>
--
Ćukasz Stelmach
Samsung R&D Institute Poland
Samsung Electronics
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