linux-hardening - [PATCH 3/7] scsi: qedf: replace deprecated strncpy with strscpy

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Message-ID: <20240223-strncpy-drivers-scsi-mpi3mr-mpi3mr_fw-c-v1-3-9cd3882f0700@google.com>
Date: Fri, 23 Feb 2024 22:23:08 +0000
From: Justin Stitt <justinstitt@...gle.com>
To: Sathya Prakash Veerichetty <sathya.prakash@...adcom.com>, Kashyap Desai <kashyap.desai@...adcom.com>, 
	Sumit Saxena <sumit.saxena@...adcom.com>, Sreekanth Reddy <sreekanth.reddy@...adcom.com>, 
	"James E.J. Bottomley" <jejb@...ux.ibm.com>, "Martin K. Petersen" <martin.petersen@...cle.com>, 
	Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>, Ariel Elior <aelior@...vell.com>, 
	Manish Chopra <manishc@...vell.com>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Saurav Kashyap <skashyap@...vell.com>, Javed Hasan <jhasan@...vell.com>, 
	GR-QLogic-Storage-Upstream@...vell.com, Nilesh Javali <njavali@...vell.com>, 
	Manish Rangankar <mrangankar@...vell.com>, Don Brace <don.brace@...rochip.com>
Cc: mpi3mr-linuxdrv.pdl@...adcom.com, linux-scsi@...r.kernel.org, 
	linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Kees Cook <keescook@...omium.org>, MPT-FusionLinux.pdl@...adcom.com, 
	netdev@...r.kernel.org, storagedev@...rochip.com, 
	Justin Stitt <justinstitt@...gle.com>
Subject: [PATCH 3/7] scsi: qedf: replace deprecated strncpy with strscpy

We expect slowpath_params.name to be NUL-terminated based on its future
usage with other string APIs:

|	static int qed_slowpath_start(struct qed_dev *cdev,
|				      struct qed_slowpath_params *params)
...
|	strscpy(drv_version.name, params->name,
|		MCP_DRV_VER_STR_SIZE - 4);

Moreover, NUL-padding is not necessary as the only use for this slowpath
name parameter is to copy into the drv_version.name field.

Also, let's prefer using strscpy(src, dest, sizeof(src)) in two
instances (one of which is outside of the scsi system but it is trivial
and related to this patch).

We can see the drv_version.name size here:
|	struct qed_mcp_drv_version {
|		u32	version;
|		u8	name[MCP_DRV_VER_STR_SIZE - 4];
|	};

Signed-off-by: Justin Stitt <justinstitt@...gle.com>
---
 drivers/net/ethernet/qlogic/qed/qed_main.c | 2 +-
 drivers/scsi/qedf/qedf_main.c              | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_main.c b/drivers/net/ethernet/qlogic/qed/qed_main.c
index c278f8893042..d39e198fe8db 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_main.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_main.c
@@ -1351,7 +1351,7 @@ static int qed_slowpath_start(struct qed_dev *cdev,
 				      (params->drv_rev << 8) |
 				      (params->drv_eng);
 		strscpy(drv_version.name, params->name,
-			MCP_DRV_VER_STR_SIZE - 4);
+			sizeof(drv_version.name));
 		rc = qed_mcp_send_drv_version(hwfn, hwfn->p_main_ptt,
 					      &drv_version);
 		if (rc) {
diff --git a/drivers/scsi/qedf/qedf_main.c b/drivers/scsi/qedf/qedf_main.c
index a58353b7b4e8..fd12439cbaab 100644
--- a/drivers/scsi/qedf/qedf_main.c
+++ b/drivers/scsi/qedf/qedf_main.c
@@ -3468,7 +3468,7 @@ static int __qedf_probe(struct pci_dev *pdev, int mode)
 	slowpath_params.drv_minor = QEDF_DRIVER_MINOR_VER;
 	slowpath_params.drv_rev = QEDF_DRIVER_REV_VER;
 	slowpath_params.drv_eng = QEDF_DRIVER_ENG_VER;
-	strncpy(slowpath_params.name, "qedf", QED_DRV_VER_STR_SIZE);
+	strscpy(slowpath_params.name, "qedf", sizeof(slowpath_params.name));
 	rc = qed_ops->common->slowpath_start(qedf->cdev, &slowpath_params);
 	if (rc) {
 		QEDF_ERR(&(qedf->dbg_ctx), "Cannot start slowpath.\n");

-- 
2.44.0.rc0.258.g7320e95886-goog