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Date: Wed, 28 Feb 2024 22:59:01 +0000
In-Reply-To: <20240228-strncpy-drivers-scsi-mpi3mr-mpi3mr_fw-c-v2-0-dacebd3fcfa0@google.com>
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Message-ID: <20240228-strncpy-drivers-scsi-mpi3mr-mpi3mr_fw-c-v2-1-dacebd3fcfa0@google.com>
Subject: [PATCH v2 1/7] scsi: mpi3mr: replace deprecated strncpy with assignments
From: Justin Stitt <justinstitt@google.com>
To: Sathya Prakash Veerichetty <sathya.prakash@broadcom.com>, Kashyap Desai <kashyap.desai@broadcom.com>, 
	Sumit Saxena <sumit.saxena@broadcom.com>, Sreekanth Reddy <sreekanth.reddy@broadcom.com>, 
	"James E.J. Bottomley" <jejb@linux.ibm.com>, "Martin K. Petersen" <martin.petersen@oracle.com>, 
	Suganath Prabu Subramani <suganath-prabu.subramani@broadcom.com>, Ariel Elior <aelior@marvell.com>, 
	Manish Chopra <manishc@marvell.com>, "David S. Miller" <davem@davemloft.net>, 
	Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>, 
	Saurav Kashyap <skashyap@marvell.com>, Javed Hasan <jhasan@marvell.com>, 
	GR-QLogic-Storage-Upstream@marvell.com, Nilesh Javali <njavali@marvell.com>, 
	Manish Rangankar <mrangankar@marvell.com>, Don Brace <don.brace@microchip.com>
Cc: mpi3mr-linuxdrv.pdl@broadcom.com, linux-scsi@vger.kernel.org, 
	linux-hardening@vger.kernel.org, linux-kernel@vger.kernel.org, 
	Kees Cook <keescook@chromium.org>, MPT-FusionLinux.pdl@broadcom.com, 
	netdev@vger.kernel.org, storagedev@microchip.com, 
	Justin Stitt <justinstitt@google.com>
Content-Type: text/plain; charset="utf-8"

Really, there's no bug with the current code. Let's just ditch strncpy()
all together.

We can just copy the const strings instead of reserving room on the
stack.

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@vger.kernel.org
Signed-off-by: Justin Stitt <justinstitt@google.com>

---
changes from v1->v2:
* use const char* assignments rather than strscpy (thanks Finn+Kees)
---
 drivers/scsi/mpi3mr/mpi3mr_fw.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/mpi3mr/mpi3mr_fw.c b/drivers/scsi/mpi3mr/mpi3mr_fw.c
index 528f19f782f2..da0710cdac1d 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_fw.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_fw.c
@@ -3676,7 +3676,7 @@ static const struct {
  * mpi3mr_print_ioc_info - Display controller information
  * @mrioc: Adapter instance reference
  *
- * Display controller personalit, capability, supported
+ * Display controller personality, capability, supported
  * protocols etc.
  *
  * Return: Nothing
@@ -3685,20 +3685,20 @@ static void
 mpi3mr_print_ioc_info(struct mpi3mr_ioc *mrioc)
 {
 	int i = 0, bytes_written = 0;
-	char personality[16];
+	const char *personality;
 	char protocol[50] = {0};
 	char capabilities[100] = {0};
 	struct mpi3mr_compimg_ver *fwver = &mrioc->facts.fw_ver;
 
 	switch (mrioc->facts.personality) {
 	case MPI3_IOCFACTS_FLAGS_PERSONALITY_EHBA:
-		strncpy(personality, "Enhanced HBA", sizeof(personality));
+		personality = "Enhanced HBA";
 		break;
 	case MPI3_IOCFACTS_FLAGS_PERSONALITY_RAID_DDR:
-		strncpy(personality, "RAID", sizeof(personality));
+		personality = "RAID";
 		break;
 	default:
-		strncpy(personality, "Unknown", sizeof(personality));
+		personality = "Unknown";
 		break;
 	}
 

-- 
2.44.0.rc1.240.g4c46232300-goog