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Mon, 16 Oct 2023 01:40:59 -0700 (PDT) > -----Original Message----- > From: Intel-wired-lan On Behalf Of J= ustin Stitt > Sent: Wednesday, October 11, 2023 3:57 AM > To: Brandeburg, Jesse ; Nguyen, Anthony L ; David S. Miller ; Eric Duma= zet ; Jakub Kicinski ; Paolo Abeni > Cc: netdev@vger.kernel.org; Justin Stitt ; intel-= wired-lan@lists.osuosl.org; linux-hardening@vger.kernel.org; linux-kernel@v= ger.kernel.org > Subject: [Intel-wired-lan] [PATCH v1 net-next 6/7] igbvf: replace depreca= ted 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 expect netdev->name to be NUL-terminated based on its usage with > `strlen` and format strings: > | if (strlen(netdev->name) < (IFNAMSIZ - 5)) { > | sprintf(adapter->tx_ring->name, "%s-tx-0", netdev->name); > > Moreover, we do not need NUL-padding as netdev is already > zero-allocated: > | netdev =3D alloc_etherdev(sizeof(struct igbvf_adapter)); > ... > alloc_etherdev() -> alloc_etherdev_mq() -> alloc_etherdev_mqs() -> > alloc_netdev_mqs() ... > | p =3D kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFA= IL); > > 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#strn= cpy-on-nul-terminated-strings [1] > Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.h= tml [2] > Link: https://github.com/KSPP/linux/issues/90 > Cc: linux-hardening@vger.kernel.org > Signed-off-by: Justin Stitt > > --- > Note: build-tested only. > --- > drivers/net/ethernet/intel/igbvf/netdev.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > Tested-by: Pucha Himasekhar Reddy (A Co= ntingent worker at Intel)