lkml.org 
[lkml]   [2018]   [Feb]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.4 01/22] netfilter: drop outermost socket lock in getsockopt()
Date
4.4-stable review patch.  If anyone has any objections, please let me know.

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

From: Paolo Abeni <pabeni@redhat.com>

commit 01ea306f2ac2baff98d472da719193e738759d93 upstream.

The Syzbot reported a possible deadlock in the netfilter area caused by
rtnl lock, xt lock and socket lock being acquired with a different order
on different code paths, leading to the following backtrace:
Reviewed-by: Xin Long <lucien.xin@gmail.com>

======================================================
WARNING: possible circular locking dependency detected
4.15.0+ #301 Not tainted
------------------------------------------------------
syzkaller233489/4179 is trying to acquire lock:
(rtnl_mutex){+.+.}, at: [<0000000048e996fd>] rtnl_lock+0x17/0x20
net/core/rtnetlink.c:74

but task is already holding lock:
(&xt[i].mutex){+.+.}, at: [<00000000328553a2>]
xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1041

which lock already depends on the new lock.
===

Since commit 3f34cfae1230 ("netfilter: on sockopt() acquire sock lock
only in the required scope"), we already acquire the socket lock in
the innermost scope, where needed. In such commit I forgot to remove
the outer-most socket lock from the getsockopt() path, this commit
addresses the issues dropping it now.

v1 -> v2: fix bad subj, added relavant 'fixes' tag

Fixes: 22265a5c3c10 ("netfilter: xt_TEE: resolve oif using netdevice notifiers")
Fixes: 202f59afd441 ("netfilter: ipt_CLUSTERIP: do not hold dev")
Fixes: 3f34cfae1230 ("netfilter: on sockopt() acquire sock lock only in the required scope")
Reported-by: syzbot+ddde1c7b7ff7442d7f2d@syzkaller.appspotmail.com
Suggested-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Tested-by: Krzysztof Piotr Oledzki <ole@ans.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
net/ipv4/ip_sockglue.c | 7 +------
net/ipv6/ipv6_sockglue.c | 10 ++--------
2 files changed, 3 insertions(+), 14 deletions(-)

--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -1527,10 +1527,7 @@ int ip_getsockopt(struct sock *sk, int l
if (get_user(len, optlen))
return -EFAULT;

- lock_sock(sk);
- err = nf_getsockopt(sk, PF_INET, optname, optval,
- &len);
- release_sock(sk);
+ err = nf_getsockopt(sk, PF_INET, optname, optval, &len);
if (err >= 0)
err = put_user(len, optlen);
return err;
@@ -1562,9 +1559,7 @@ int compat_ip_getsockopt(struct sock *sk
if (get_user(len, optlen))
return -EFAULT;

- lock_sock(sk);
err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
- release_sock(sk);
if (err >= 0)
err = put_user(len, optlen);
return err;
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -1340,10 +1340,7 @@ int ipv6_getsockopt(struct sock *sk, int
if (get_user(len, optlen))
return -EFAULT;

- lock_sock(sk);
- err = nf_getsockopt(sk, PF_INET6, optname, optval,
- &len);
- release_sock(sk);
+ err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
if (err >= 0)
err = put_user(len, optlen);
}
@@ -1382,10 +1379,7 @@ int compat_ipv6_getsockopt(struct sock *
if (get_user(len, optlen))
return -EFAULT;

- lock_sock(sk);
- err = compat_nf_getsockopt(sk, PF_INET6,
- optname, optval, &len);
- release_sock(sk);
+ err = compat_nf_getsockopt(sk, PF_INET6, optname, optval, &len);
if (err >= 0)
err = put_user(len, optlen);
}

\
 
 \ /
  Last update: 2018-02-26 22:07    [W:0.937 / U:6.132 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site