linux-hardening - [PATCH] mac80211: Replace strlcpy with strscpy

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Message-ID: <20230613003404.3538524-1-azeemshaikh38@gmail.com>
Date:   Tue, 13 Jun 2023 00:34:04 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Subject: [PATCH] mac80211: 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 LOCAL_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>
---
 net/mac80211/trace.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mac80211/trace.h b/net/mac80211/trace.h
index db0d0132c58c..c51c6e3feac9 100644
--- a/net/mac80211/trace.h
+++ b/net/mac80211/trace.h
@@ -17,7 +17,7 @@
 
 #define MAXNAME		32
 #define LOCAL_ENTRY	__array(char, wiphy_name, 32)
-#define LOCAL_ASSIGN	strlcpy(__entry->wiphy_name, wiphy_name(local->hw.wiphy), MAXNAME)
+#define LOCAL_ASSIGN	strscpy(__entry->wiphy_name, wiphy_name(local->hw.wiphy), MAXNAME)
 #define LOCAL_PR_FMT	"%s"
 #define LOCAL_PR_ARG	__entry->wiphy_name
 
-- 
2.41.0.162.gfafddb0af9-goog