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Message-ID: <20231005-strncpy-drivers-net-ethernet-asix-ax88796c_ioctl-c-v1-1-6fafdc38b170@google.com> Date: Thu, 05 Oct 2023 01:06:26 +0000 From: Justin Stitt <justinstitt@...gle.com> To: "Ćukasz Stelmach" <l.stelmach@...sung.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, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org, Justin Stitt <justinstitt@...gle.com> Subject: [PATCH] net: ax88796c: replace deprecated strncpy with strscpy `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(-) 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>
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