netdev - RE: [Intel-wired-lan] [PATCH v1 net-next 5/7] igb: replace deprecated strncpy with strscpy

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Message-ID: <BL0PR11MB31226EB326F7170325155973BDD7A@BL0PR11MB3122.namprd11.prod.outlook.com>
Date: Mon, 16 Oct 2023 08:42:36 +0000
From: "Pucha, HimasekharX Reddy" <himasekharx.reddy.pucha@...el.com>
To: Justin Stitt <justinstitt@...gle.com>, "Brandeburg, Jesse"
	<jesse.brandeburg@...el.com>, "Nguyen, Anthony L"
	<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: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
	"linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [Intel-wired-lan] [PATCH v1 net-next 5/7] igb: replace deprecated
 strncpy with strscpy

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of Justin Stitt
> Sent: Wednesday, October 11, 2023 3:57 AM
> To: Brandeburg, Jesse <jesse.brandeburg@...el.com>; Nguyen, Anthony L <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: netdev@...r.kernel.org; Justin Stitt <justinstitt@...gle.com>; intel-wired-lan@...ts.osuosl.org; linux-hardening@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [Intel-wired-lan] [PATCH v1 net-next 5/7] igb: 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.
>
> We see that netdev->name is expected to be NUL-terminated based on its
> usage with format strings:
> |       sprintf(q_vector->name, "%s-TxRx-%u", netdev->name,
> |               q_vector->rx.ring->queue_index);
>
> Furthermore, NUL-padding is not required as netdev is already
> zero-allocated:
> |       netdev = alloc_etherdev_mq(sizeof(struct igb_adapter),
> |                                  IGB_MAX_TX_QUEUES);
> ...
> alloc_etherdev_mq() -> alloc_etherdev_mqs() -> alloc_netdev_mqs() ...
> |       p = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL);
>
> 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>
>
> ---
> Note: build-tested only.
> ---
>  drivers/net/ethernet/intel/igb/igb_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>

Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@...el.com> (A Contingent worker at Intel)