linux-kernel - [PATCH] liquidio: replace deprecated strncpy with strscpy

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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>