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

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Message-ID: <20230703175840.3706231-1-azeemshaikh38@gmail.com>
Date:   Mon,  3 Jul 2023 17:58:40 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org,
        David Ahern <dsahern@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Kees Cook <keescook@...omium.org>, netdev@...r.kernel.org
Subject: [PATCH] net: 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().
No return values were used, so direct replacement is safe.

[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>
---
 include/trace/events/fib.h  |    2 +-
 include/trace/events/fib6.h |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/trace/events/fib.h b/include/trace/events/fib.h
index 76297ecd4935..20b914250ce9 100644
--- a/include/trace/events/fib.h
+++ b/include/trace/events/fib.h
@@ -65,7 +65,7 @@ TRACE_EVENT(fib_table_lookup,
 		}
 
 		dev = nhc ? nhc->nhc_dev : NULL;
-		strlcpy(__entry->name, dev ? dev->name : "-", IFNAMSIZ);
+		strscpy(__entry->name, dev ? dev->name : "-", IFNAMSIZ);
 
 		if (nhc) {
 			if (nhc->nhc_gw_family == AF_INET) {
diff --git a/include/trace/events/fib6.h b/include/trace/events/fib6.h
index 4d3e607b3cde..5d7ee2610728 100644
--- a/include/trace/events/fib6.h
+++ b/include/trace/events/fib6.h
@@ -63,7 +63,7 @@ TRACE_EVENT(fib6_table_lookup,
 		}
 
 		if (res->nh && res->nh->fib_nh_dev) {
-			strlcpy(__entry->name, res->nh->fib_nh_dev->name, IFNAMSIZ);
+			strscpy(__entry->name, res->nh->fib_nh_dev->name, IFNAMSIZ);
 		} else {
 			strcpy(__entry->name, "-");
 		}
-- 
2.41.0.255.g8b1d071c50-goog