netdev - [PATCH v4 10/11] net: Replace strcpy() with __get_task

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Message-Id: <20240628090517.17994-10-laoar.shao@gmail.com>
Date: Fri, 28 Jun 2024 17:05:16 +0800
From: Yafang Shao <laoar.shao@...il.com>
To: torvalds@...ux-foundation.org,
	laoar.shao@...il.com
Cc: akpm@...ux-foundation.org,
	alexei.starovoitov@...il.com,
	audit@...r.kernel.org,
	bpf@...r.kernel.org,
	catalin.marinas@....com,
	dri-devel@...ts.freedesktop.org,
	ebiederm@...ssion.com,
	linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org,
	linux-security-module@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	penguin-kernel@...ove.sakura.ne.jp,
	rostedt@...dmis.org,
	selinux@...r.kernel.org,
	"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 v4 10/11] net: Replace strcpy() with __get_task_comm()

To prevent errors from occurring when the src string is longer than the dst
string in strcpy(), we should use __get_task_comm() 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..10d8e8c6ca02 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);
+		__get_task_comm(warncomm, TASK_COMM_LEN, current);
 		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