linux-hardening - [PATCH] net/mediatek: strlcpy withreturn

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Date:   Tue, 13 Jun 2023 00:34:57 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kalle Valo <kvalo@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH] net/mediatek: strlcpy withreturn

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@...il.com>
---
 drivers/net/wireless/mediatek/mt7601u/trace.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt7601u/trace.h b/drivers/net/wireless/mediatek/mt7601u/trace.h
index 5a6ba015085f..07696b672161 100644
--- a/drivers/net/wireless/mediatek/mt7601u/trace.h
+++ b/drivers/net/wireless/mediatek/mt7601u/trace.h
@@ -16,7 +16,7 @@
 
 #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
-- 
2.41.0.162.gfafddb0af9-goog