wifi: mt76: Replace 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(). 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] KSPP#89 Signed-off-by: Azeem Shaikh <[email protected]> Reviewed-by: Kees Cook <[email protected]> Signed-off-by: Kalle Valo <[email protected]> Link: https://lore.kernel.org/r/[email protected]
caleberi · Aug 2, 2023 · d6b484b · d6b484b
1 parent 111d5c4
commit d6b484b
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Showing 4 changed files with 4 additions and 4 deletions.
diff --git 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
@@ -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
@@ -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
@@ -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