linux-hardening - [PATCH] w1: sgi_w1: Replace all non-returning strlcpy with strscpy

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Message-ID: <20230523022023.2406955-1-azeemshaikh38@gmail.com>
Date:   Tue, 23 May 2023 02:20:23 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] w1: sgi_w1: 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/w1/masters/sgi_w1.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/w1/masters/sgi_w1.c b/drivers/w1/masters/sgi_w1.c
index e8c7fa68d3cc..d7fbc3c146e1 100644
--- a/drivers/w1/masters/sgi_w1.c
+++ b/drivers/w1/masters/sgi_w1.c
@@ -93,7 +93,7 @@ static int sgi_w1_probe(struct platform_device *pdev)
 
 	pdata = dev_get_platdata(&pdev->dev);
 	if (pdata) {
-		strlcpy(sdev->dev_id, pdata->dev_id, sizeof(sdev->dev_id));
+		strscpy(sdev->dev_id, pdata->dev_id, sizeof(sdev->dev_id));
 		sdev->bus_master.dev_id = sdev->dev_id;
 	}