55 lines
1.7 KiB
Diff
55 lines
1.7 KiB
Diff
From: Eric Dumazet <edumazet@google.com>
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Date: Fri, 24 Mar 2017 19:36:13 -0700
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Subject: ping: implement proper locking
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Origin: https://git.kernel.org/linus/43a6684519ab0a6c52024b5e25322476cabad893
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Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2017-2671
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We got a report of yet another bug in ping
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http://www.openwall.com/lists/oss-security/2017/03/24/6
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->disconnect() is not called with socket lock held.
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Fix this by acquiring ping rwlock earlier.
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Thanks to Daniel, Alexander and Andrey for letting us know this problem.
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Fixes: c319b4d76b9e ("net: ipv4: add IPPROTO_ICMP socket kind")
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Signed-off-by: Eric Dumazet <edumazet@google.com>
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Reported-by: Daniel Jiang <danieljiang0415@gmail.com>
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Reported-by: Solar Designer <solar@openwall.com>
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Reported-by: Andrey Konovalov <andreyknvl@google.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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net/ipv4/ping.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
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index 2af6244b83e2..ccfbce13a633 100644
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--- a/net/ipv4/ping.c
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+++ b/net/ipv4/ping.c
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@@ -156,17 +156,18 @@ int ping_hash(struct sock *sk)
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void ping_unhash(struct sock *sk)
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{
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struct inet_sock *isk = inet_sk(sk);
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+
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pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num);
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+ write_lock_bh(&ping_table.lock);
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if (sk_hashed(sk)) {
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- write_lock_bh(&ping_table.lock);
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hlist_nulls_del(&sk->sk_nulls_node);
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sk_nulls_node_init(&sk->sk_nulls_node);
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sock_put(sk);
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isk->inet_num = 0;
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isk->inet_sport = 0;
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
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- write_unlock_bh(&ping_table.lock);
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}
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+ write_unlock_bh(&ping_table.lock);
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}
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EXPORT_SYMBOL_GPL(ping_unhash);
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--
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2.11.0
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