netdev - [PATCH net-next] net: allow SO_MARK with CAP_NET

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Message-Id: <20220131233357.52964-1-kuba@kernel.org>
Date:   Mon, 31 Jan 2022 15:33:57 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, dsahern@...il.com, edumazet@...gle.com,
        Jakub Kicinski <kuba@...nel.org>, maze@...gle.com
Subject: [PATCH net-next] net: allow SO_MARK with CAP_NET_RAW via cmsg

There's not reason SO_MARK would be allowed via setsockopt()
and not via cmsg, let's keep the two consistent. See
commit 079925cce1d0 ("net: allow SO_MARK with CAP_NET_RAW")
for justification why NET_RAW -> SO_MARK is safe.

Signed-off-by: Jakub Kicinski <kuba@...nel.org>
--
CC: maze@...gle.com
---
 net/core/sock.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index d6804685f17f..09d31a7dc68f 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2625,7 +2625,8 @@ int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
 
 	switch (cmsg->cmsg_type) {
 	case SO_MARK:
-		if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
+		if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
+		    !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
 			return -EPERM;
 		if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
 			return -EINVAL;
-- 
2.34.1