linux-hardening - [PATCH] scsi: libfcoe: Replace all non-returning strlcpy with strscpy

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Message-ID: <20230530155818.368562-1-azeemshaikh38@gmail.com>
Date:   Tue, 30 May 2023 15:58:18 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Hannes Reinecke <hare@...e.de>
Cc:     linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH] scsi: libfcoe: Replace all non-returning strlcpy with strscpy

strlcpy() reads the entire source buffer first.
This read may exceed the destination size limit.
This is both inefficient and can lead to linear read
overflows if a source string is not NUL-terminated [1].
In an effort to remove strlcpy() completely [2], replace
strlcpy() here with strscpy().
No return values were used, so direct replacement is safe.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

Signed-off-by: Azeem Shaikh <azeemshaikh38@...il.com>
---
 drivers/scsi/fcoe/fcoe_transport.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/fcoe/fcoe_transport.c b/drivers/scsi/fcoe/fcoe_transport.c
index 46b0bf237be1..a48d24af9ac3 100644
--- a/drivers/scsi/fcoe/fcoe_transport.c
+++ b/drivers/scsi/fcoe/fcoe_transport.c
@@ -711,7 +711,7 @@ static struct net_device *fcoe_if_to_netdev(const char *buffer)
 	char ifname[IFNAMSIZ + 2];
 
 	if (buffer) {
-		strlcpy(ifname, buffer, IFNAMSIZ);
+		strscpy(ifname, buffer, IFNAMSIZ);
 		cp = ifname + strlen(ifname);
 		while (--cp >= ifname && *cp == '\n')
 			*cp = '\0';