netdev - [PATCH] net: Replace strlcpy with strscpy

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

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