linux-kernel - [PATCH AUTOSEL 4.20 027/105] bpf: Fix [::] -> [::1] rewrite in sys

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Message-Id: <20190213023336.19019-27-sashal@kernel.org>
Date:   Tue, 12 Feb 2019 21:32:18 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Andrey Ignatov <rdna@...com>, Alexei Starovoitov <ast@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.20 027/105] bpf: Fix [::] -> [::1] rewrite in sys_sendmsg

From: Andrey Ignatov <rdna@...com>

[ Upstream commit e8e36984080b55ac5e57bdb09a5b570f2fc8e963 ]

sys_sendmsg has supported unspecified destination IPv6 (wildcard) for
unconnected UDP sockets since 876c7f41. When [::] is passed by user as
destination, sys_sendmsg rewrites it with [::1] to be consistent with
BSD (see "BSD'ism" comment in the code).

This didn't work when cgroup-bpf was enabled though since the rewrite
[::] -> [::1] happened before passing control to cgroup-bpf block where
fl6.daddr was updated with passed by user sockaddr_in6.sin6_addr (that
might or might not be changed by BPF program). That way if user passed
[::] as dst IPv6 it was first rewritten with [::1] by original code from
876c7f41, but then rewritten back with [::] by cgroup-bpf block.

It happened even when BPF_CGROUP_UDP6_SENDMSG program was not present
(CONFIG_CGROUP_BPF=y was enough).

The fix is to apply BSD'ism after cgroup-bpf block so that [::] is
replaced with [::1] no matter where it came from: passed by user to
sys_sendmsg or set by BPF_CGROUP_UDP6_SENDMSG program.

Fixes: 1cedee13d25a ("bpf: Hooks for sys_sendmsg")
Reported-by: Nitin Rawat <nitin.rawat@...el.com>
Signed-off-by: Andrey Ignatov <rdna@...com>
Signed-off-by: Alexei Starovoitov <ast@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/ipv6/udp.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index d01ec252cb81..848dd38a907a 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1322,10 +1322,7 @@ do_udp_sendmsg:
 	ipc6.opt = opt;

 	fl6.flowi6_proto = sk->sk_protocol;
-	if (!ipv6_addr_any(daddr))
-		fl6.daddr = *daddr;
-	else
-		fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
+	fl6.daddr = *daddr;
 	if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
 		fl6.saddr = np->saddr;
 	fl6.fl6_sport = inet->inet_sport;
@@ -1353,6 +1350,9 @@ do_udp_sendmsg:
 		}
 	}

+	if (ipv6_addr_any(&fl6.daddr))
+		fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
+
 	final_p = fl6_update_dst(&fl6, opt, &final);
 	if (final_p)
 		connected = false;
-- 
2.19.1