netdev - [PATCH v6 8/9] net: Replace strcpy() with strscpy()

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Message-Id: <20240812022933.69850-9-laoar.shao@gmail.com>
Date: Mon, 12 Aug 2024 10:29:32 +0800
From: Yafang Shao <laoar.shao@...il.com>
To: akpm@...ux-foundation.org
Cc: torvalds@...ux-foundation.org,
	ebiederm@...ssion.com,
	alexei.starovoitov@...il.com,
	rostedt@...dmis.org,
	catalin.marinas@....com,
	penguin-kernel@...ove.sakura.ne.jp,
	linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	audit@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	selinux@...r.kernel.org,
	bpf@...r.kernel.org,
	netdev@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	Yafang Shao <laoar.shao@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH v6 8/9] net: Replace strcpy() with strscpy()

To prevent errors from occurring when the src string is longer than the dst
string in strcpy(), we should use strscpy() instead. This approach
also facilitates future extensions to the task comm.

Signed-off-by: Yafang Shao <laoar.shao@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: David Ahern <dsahern@...nel.org>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
---
 net/ipv6/ndisc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 254b192c5705..bf969a4773c0 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1942,7 +1942,7 @@ static void ndisc_warn_deprecated_sysctl(const struct ctl_table *ctl,
 	static char warncomm[TASK_COMM_LEN];
 	static int warned;
 	if (strcmp(warncomm, current->comm) && warned < 5) {
-		strcpy(warncomm, current->comm);
+		strscpy(warncomm, current->comm, sizeof(warncomm));
 		pr_warn("process `%s' is using deprecated sysctl (%s) net.ipv6.neigh.%s.%s - use net.ipv6.neigh.%s.%s_ms instead\n",
 			warncomm, func,
 			dev_name, ctl->procname,
-- 
2.43.5