6.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jakub Kicinski <kuba@xxxxxxxxxx>
[ Upstream commit a535d59432370343058755100ee75ab03c0e3f91 ]
For TLS offload we mark packets with skb->decrypted to make sure
they don't escape the host without getting encrypted first.
The crypto state lives in the socket, so it may get detached
by a call to skb_orphan(). As a safety check - the egress path
drops all packets with skb->decrypted and no "crypto-safe" socket.
The skb marking was added to sendpage only (and not sendmsg),
because tls_device injected data into the TCP stack using sendpage.
This special case was missed when sendpage got folded into sendmsg.
Fixes: c5c37af6ecad ("tcp: Convert do_tcp_sendpages() to use MSG_SPLICE_PAGES")
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Reviewed-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240530232607.82686-1-kuba@xxxxxxxxxx
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/ipv4/tcp.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 66d77faca64f6..5c79836e4c9e7 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1159,6 +1159,9 @@ int tcp_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t size)
process_backlog++;
+#ifdef CONFIG_SKB_DECRYPTED
+ skb->decrypted = !!(flags & MSG_SENDPAGE_DECRYPTED);
+#endif
tcp_skb_entail(sk, skb);
copy = size_goal;
--
2.43.0
