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

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Date:   Wed, 17 May 2023 14:30:49 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Adaptec OEM Raid Solutions <aacraid@...rosemi.com>
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: aacraid: 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/aacraid/aachba.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index 24c049eff157..70e1cac1975e 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -3289,7 +3289,7 @@ static int query_disk(struct aac_dev *dev, void __user *arg)
 	else
 		qd.unmapped = 0;
 
-	strlcpy(qd.name, fsa_dev_ptr[qd.cnum].devname,
+	strscpy(qd.name, fsa_dev_ptr[qd.cnum].devname,
 	  min(sizeof(qd.name), sizeof(fsa_dev_ptr[qd.cnum].devname) + 1));
 
 	if (copy_to_user(arg, &qd, sizeof (struct aac_query_disk)))