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From: Azeem Shaikh <azeemshaikh38@gmail.com>
To: Felix Fietkau <nbd@nbd.name>,
	Lorenzo Bianconi <lorenzo@kernel.org>,
	Ryder Lee <ryder.lee@mediatek.com>
Cc: linux-hardening@vger.kernel.org,
	Azeem Shaikh <azeemshaikh38@gmail.com>,
	Shayne Chen <shayne.chen@mediatek.com>,
	Sean Wang <sean.wang@mediatek.com>,
	linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org,
	Kalle Valo <kvalo@kernel.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	AngeloGioacchino Del Regno 
	<angelogioacchino.delregno@collabora.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org
Subject: [PATCH] wifi: mt76: Replace strlcpy with strscpy
Date: Mon,  3 Jul 2023 18:12:56 +0000	[thread overview]
Message-ID: <20230703181256.3712079-1-azeemshaikh38@gmail.com> (raw)

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().

Direct replacement is safe here since DEV_ASSIGN is only used by
TRACE macros and the return values are ignored.

[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@gmail.com>
---
 drivers/net/wireless/mediatek/mt76/mt7615/mt7615_trace.h | 2 +-
 drivers/net/wireless/mediatek/mt76/mt76x02_trace.h       | 2 +-
 drivers/net/wireless/mediatek/mt76/mt7921/mt7921_trace.h | 2 +-
 drivers/net/wireless/mediatek/mt76/trace.h               | 2 +-
 drivers/net/wireless/mediatek/mt76/usb_trace.h           | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mt7615_trace.h b/drivers/net/wireless/mediatek/mt76/mt7615/mt7615_trace.h
index d3eb49d83b98..9be5a58a4e6d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mt7615_trace.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mt7615_trace.h
@@ -14,7 +14,7 @@
 
 #define MAXNAME		32
 #define DEV_ENTRY	__array(char, wiphy_name, 32)
-#define DEV_ASSIGN	strlcpy(__entry->wiphy_name,	\
+#define DEV_ASSIGN	strscpy(__entry->wiphy_name,	\
 				wiphy_name(mt76_hw(dev)->wiphy), MAXNAME)
 #define DEV_PR_FMT	"%s"
 #define DEV_PR_ARG	__entry->wiphy_name
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_trace.h b/drivers/net/wireless/mediatek/mt76/mt76x02_trace.h
index 6a98092e996b..11d119cd0f6f 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_trace.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_trace.h
@@ -14,7 +14,7 @@
 
 #define MAXNAME		32
 #define DEV_ENTRY	__array(char, wiphy_name, 32)
-#define DEV_ASSIGN	strlcpy(__entry->wiphy_name,	\
+#define DEV_ASSIGN	strscpy(__entry->wiphy_name,	\
 				wiphy_name(mt76_hw(dev)->wiphy), MAXNAME)
 #define DEV_PR_FMT	"%s"
 #define DEV_PR_ARG	__entry->wiphy_name
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921_trace.h b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921_trace.h
index 9bc4db67f352..887d5cfddd01 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921_trace.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921_trace.h
@@ -14,7 +14,7 @@
 
 #define MAXNAME		32
 #define DEV_ENTRY	__array(char, wiphy_name, 32)
-#define DEV_ASSIGN	strlcpy(__entry->wiphy_name,	\
+#define DEV_ASSIGN	strscpy(__entry->wiphy_name,	\
 				wiphy_name(mt76_hw(dev)->wiphy), MAXNAME)
 #define DEV_PR_FMT	"%s"
 #define DEV_PR_ARG	__entry->wiphy_name
diff --git a/drivers/net/wireless/mediatek/mt76/trace.h b/drivers/net/wireless/mediatek/mt76/trace.h
index c3d0ef8e2890..109a07f9733a 100644
--- a/drivers/net/wireless/mediatek/mt76/trace.h
+++ b/drivers/net/wireless/mediatek/mt76/trace.h
@@ -14,7 +14,7 @@
 
 #define MAXNAME		32
 #define DEV_ENTRY	__array(char, wiphy_name, 32)
-#define DEVICE_ASSIGN	strlcpy(__entry->wiphy_name,	\
+#define DEVICE_ASSIGN	strscpy(__entry->wiphy_name,	\
 				wiphy_name(dev->hw->wiphy), MAXNAME)
 #define DEV_PR_FMT	"%s"
 #define DEV_PR_ARG	__entry->wiphy_name
diff --git a/drivers/net/wireless/mediatek/mt76/usb_trace.h b/drivers/net/wireless/mediatek/mt76/usb_trace.h
index f5ab3215af80..7b261ddb2ac6 100644
--- a/drivers/net/wireless/mediatek/mt76/usb_trace.h
+++ b/drivers/net/wireless/mediatek/mt76/usb_trace.h
@@ -14,7 +14,7 @@
 
 #define MAXNAME		32
 #define DEV_ENTRY	__array(char, wiphy_name, 32)
-#define DEV_ASSIGN	strlcpy(__entry->wiphy_name,	\
+#define DEV_ASSIGN	strscpy(__entry->wiphy_name,	\
 				wiphy_name(dev->hw->wiphy), MAXNAME)
 #define DEV_PR_FMT	"%s "
 #define DEV_PR_ARG	__entry->wiphy_name
-- 
2.41.0.255.g8b1d071c50-goog


             reply	other threads:[~2023-07-03 18:13 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-07-03 18:12 Azeem Shaikh [this message]
2023-07-12 23:54 ` [PATCH] wifi: mt76: Replace strlcpy with strscpy Kees Cook
2023-07-18  4:38   ` Azeem Shaikh
2023-07-27 17:02     ` Kees Cook
2023-07-27 15:52 ` Kees Cook
2023-07-27 16:00   ` Kalle Valo
2023-07-27 17:01     ` Kees Cook
2023-08-01  9:07       ` Kalle Valo
2023-08-02 10:09 ` wifi: mt76: Replace strlcpy() with strscpy() Kalle Valo

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