linux-kernel - [PATCH AUTOSEL 5.15 05/13] af_packet: avoid a false positive warning in packet

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Date: Mon, 27 May 2024 10:17:59 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Eric Dumazet <edumazet@...gle.com>,
	syzbot <syzkaller@...glegroups.com>,
	Kees Cook <keescook@...omium.org>,
	Willem de Bruijn <willemdebruijn.kernel@...il.com>,
	Willem de Bruijn <willemb@...gle.com>,
	"David S . Miller" <davem@...emloft.net>,
	Sasha Levin <sashal@...nel.org>,
	kuba@...nel.org,
	pabeni@...hat.com,
	netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 05/13] af_packet: avoid a false positive warning in packet_setsockopt()

From: Eric Dumazet <edumazet@...gle.com>

[ Upstream commit 86d43e2bf93ccac88ef71cee36a23282ebd9e427 ]

Although the code is correct, the following line

	copy_from_sockptr(&req_u.req, optval, len));

triggers this warning :

memcpy: detected field-spanning write (size 28) of single field "dst" at include/linux/sockptr.h:49 (size 16)

Refactor the code to be more explicit.

Reported-by: syzbot <syzkaller@...glegroups.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Willem de Bruijn <willemdebruijn.kernel@...il.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Willem de Bruijn <willemb@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/packet/af_packet.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index cffa217fb3063..787036afa69a5 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -3762,28 +3762,30 @@ packet_setsockopt(struct socket *sock, int level, int optname, sockptr_t optval,
 	case PACKET_TX_RING:
 	{
 		union tpacket_req_u req_u;
-		int len;
 
+		ret = -EINVAL;
 		lock_sock(sk);
 		switch (po->tp_version) {
 		case TPACKET_V1:
 		case TPACKET_V2:
-			len = sizeof(req_u.req);
+			if (optlen < sizeof(req_u.req))
+				break;
+			ret = copy_from_sockptr(&req_u.req, optval,
+						sizeof(req_u.req)) ?
+						-EINVAL : 0;
 			break;
 		case TPACKET_V3:
 		default:
-			len = sizeof(req_u.req3);
+			if (optlen < sizeof(req_u.req3))
+				break;
+			ret = copy_from_sockptr(&req_u.req3, optval,
+						sizeof(req_u.req3)) ?
+						-EINVAL : 0;
 			break;
 		}
-		if (optlen < len) {
-			ret = -EINVAL;
-		} else {
-			if (copy_from_sockptr(&req_u.req, optval, len))
-				ret = -EFAULT;
-			else
-				ret = packet_set_ring(sk, &req_u, 0,
-						    optname == PACKET_TX_RING);
-		}
+		if (!ret)
+			ret = packet_set_ring(sk, &req_u, 0,
+					      optname == PACKET_TX_RING);
 		release_sock(sk);
 		return ret;
 	}
-- 
2.43.0