linux-kernel - [PATCH 4.9 008/119] net: ping: do not abuse udp

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Message-Id: <20170612152557.049331579@linuxfoundation.org>
Date:   Mon, 12 Jun 2017 17:24:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        Sasha Levin <alexander.levin@...izon.com>,
        Solar Designer <solar@...nwall.com>,
        Vasiliy Kulikov <segoon@...nwall.com>,
        Lorenzo Colitti <lorenzo@...gle.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.9 008/119] net: ping: do not abuse udp_poll()

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

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


[ Upstream commit 77d4b1d36926a9b8387c6b53eeba42bcaaffcea3 ]

Alexander reported various KASAN messages triggered in recent kernels

The problem is that ping sockets should not use udp_poll() in the first
place, and recent changes in UDP stack finally exposed this old bug.

Fixes: c319b4d76b9e ("net: ipv4: add IPPROTO_ICMP socket kind")
Fixes: 6d0bfe226116 ("net: ipv6: Add IPv6 support to the ping socket.")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reported-by: Sasha Levin <alexander.levin@...izon.com>
Cc: Solar Designer <solar@...nwall.com>
Cc: Vasiliy Kulikov <segoon@...nwall.com>
Cc: Lorenzo Colitti <lorenzo@...gle.com>
Acked-By: Lorenzo Colitti <lorenzo@...gle.com>
Tested-By: Lorenzo Colitti <lorenzo@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/net/ipv6.h |    1 +
 net/ipv4/af_inet.c |    2 +-
 net/ipv6/ping.c    |    2 +-
 net/ipv6/raw.c     |    2 +-
 4 files changed, 4 insertions(+), 3 deletions(-)

--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -1001,6 +1001,7 @@ int inet6_hash_connect(struct inet_timew
  */
 extern const struct proto_ops inet6_stream_ops;
 extern const struct proto_ops inet6_dgram_ops;
+extern const struct proto_ops inet6_sockraw_ops;
 
 struct group_source_req;
 struct group_filter;
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1015,7 +1015,7 @@ static struct inet_protosw inetsw_array[
 		.type =       SOCK_DGRAM,
 		.protocol =   IPPROTO_ICMP,
 		.prot =       &ping_prot,
-		.ops =        &inet_dgram_ops,
+		.ops =        &inet_sockraw_ops,
 		.flags =      INET_PROTOSW_REUSE,
        },
 
--- a/net/ipv6/ping.c
+++ b/net/ipv6/ping.c
@@ -198,7 +198,7 @@ static struct inet_protosw pingv6_protos
 	.type =      SOCK_DGRAM,
 	.protocol =  IPPROTO_ICMPV6,
 	.prot =      &pingv6_prot,
-	.ops =       &inet6_dgram_ops,
+	.ops =       &inet6_sockraw_ops,
 	.flags =     INET_PROTOSW_REUSE,
 };
 
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -1330,7 +1330,7 @@ void raw6_proc_exit(void)
 #endif	/* CONFIG_PROC_FS */
 
 /* Same as inet6_dgram_ops, sans udp_poll.  */
-static const struct proto_ops inet6_sockraw_ops = {
+const struct proto_ops inet6_sockraw_ops = {
 	.family		   = PF_INET6,
 	.owner		   = THIS_MODULE,
 	.release	   = inet6_release,