mt76: replace strlcpy with strscpy

Change deprecated function strlcpy to strscpy
for compatibility with kernel 6.12.

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: Mieczyslaw Nalewaj <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/18927
Signed-off-by: Hauke Mehrtens <[email protected]>

package/kernel/mt76/patches/002-wifi-mt76-replace-strlcpy-with-strscpy.patch

@@ -0,0 +1,73 @@
+From d6b484b5cb2a7d509b36a220911509ddd8b777c4 Mon Sep 17 00:00:00 2001
+From: Azeem Shaikh <[email protected]>
+Date: Mon, 3 Jul 2023 18:12:56 +0000
+Subject: 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] https://github.com/KSPP/linux/issues/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]
+---
+ mt7615/mt7615_trace.h | 2 +-
+ mt76x02_trace.h       | 2 +-
+ trace.h               | 2 +-
+ usb_trace.h           | 2 +-
+ 4 files changed, 4 insertions(+), 4 deletions(-)
+
+--- a/mt7615/mt7615_trace.h
++++ b/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
+--- a/mt76x02_trace.h
++++ b/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
+--- a/trace.h
++++ b/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
+--- a/usb_trace.h
++++ b/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