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Message-ID: <20231005-strncpy-drivers-net-ethernet-cavium-liquidio-lio_vf_rep-c-v1-1-92123a747780@google.com> Date: Thu, 05 Oct 2023 21:55:06 +0000 From: Justin Stitt <justinstitt@...gle.com> To: Derek Chickles <dchickles@...vell.com>, Satanand Burla <sburla@...vell.com>, Felix Manlunas <fmanlunas@...vell.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] liquidio: 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. 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#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/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/net/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 = LIO_VF_REP_REQ_DEVNAME; rep_cfg.ifidx = 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)); ret = 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 <justinstitt@...gle.com>
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