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

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Message-ID: <20230530164131.987213-1-azeemshaikh38@gmail.com>
Date:   Tue, 30 May 2023 16:41:31 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Bart Van Assche <bvanassche@....org>,
        linux-scsi@...r.kernel.org,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH] scsi: ufs: 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/ufs/core/ufs-fault-injection.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufs-fault-injection.c b/drivers/ufs/core/ufs-fault-injection.c
index 7ac7c4e7ff83..5b1184aac585 100644
--- a/drivers/ufs/core/ufs-fault-injection.c
+++ b/drivers/ufs/core/ufs-fault-injection.c
@@ -54,7 +54,7 @@ static int ufs_fault_set(const char *val, const struct kernel_param *kp)
 	if (!setup_fault_attr(attr, (char *)val))
 		return -EINVAL;
 
-	strlcpy(kp->arg, val, FAULT_INJ_STR_SIZE);
+	strscpy(kp->arg, val, FAULT_INJ_STR_SIZE);
 
 	return 0;
 }