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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Justin Stitt Content-Type: text/plain; charset="utf-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable `strncpy` is deprecated for use on NUL-terminated destination strings [1] and as such we should prefer more robust and less ambiguous string interfaces. NUL-padding is not required as rep_cfg is memset to 0: | memset(&rep_cfg, 0, sizeof(rep_cfg)); 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#strncp= y-on-nul-terminated-strings [1] Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.htm= l [2] Link: https://github.com/KSPP/linux/issues/90 Cc: linux-hardening@vger.kernel.org Signed-off-by: Justin Stitt Reviewed-by: Kees Cook --- Note: build-tested only. --- drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c b/drivers/ne= t/ethernet/cavium/liquidio/lio_vf_rep.c index 600de587d7a9..aa6c0dfb6f1c 100644 --- a/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c +++ b/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c @@ -638,7 +638,8 @@ lio_vf_rep_netdev_event(struct notifier_block *nb, memset(&rep_cfg, 0, sizeof(rep_cfg)); rep_cfg.req_type =3D LIO_VF_REP_REQ_DEVNAME; rep_cfg.ifidx =3D vf_rep->ifidx; - strncpy(rep_cfg.rep_name.name, ndev->name, LIO_IF_NAME_SIZE); + strscpy(rep_cfg.rep_name.name, ndev->name, + sizeof(rep_cfg.rep_name.name)); =20 ret =3D lio_vf_rep_send_soft_command(oct, &rep_cfg, sizeof(rep_cfg), NULL, 0); --- base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2 change-id: 20231005-strncpy-drivers-net-ethernet-cavium-liquidio-lio_vf_rep= -c-b23567b42939 Best regards, -- Justin Stitt