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| author | Kirill Tkhai <ktkhai@virtuozzo.com> | 2018-03-22 12:45:22 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-03-22 22:12:56 +0300 |
| commit | 128aaa98ad1422eacc4c74879840cb3e579cd934 (patch) | |
| tree | f4e4bbd368062c32567a24e857a27fc3ab0ecd02 | |
| parent | 0526947f9dd019da8d550ed20177585a84b3460e (diff) | |
| download | linux-128aaa98ad1422eacc4c74879840cb3e579cd934.tar.xz | |
net: Revert "ipv4: fix a deadlock in ip_ra_control"
This reverts commit 1215e51edad1.
Since raw_close() is used on every RAW socket destruction,
the changes made by 1215e51edad1 scale sadly. This clearly
seen on endless unshare(CLONE_NEWNET) test, and cleanup_net()
kwork spends a lot of time waiting for rtnl_lock() introduced
by this commit.
Previous patch moved IP_ROUTER_ALERT out of rtnl_lock(),
so we revert this patch.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/ip_sockglue.c | 1 | ||||
| -rw-r--r-- | net/ipv4/ipmr.c | 11 | ||||
| -rw-r--r-- | net/ipv4/raw.c | 2 |
3 files changed, 9 insertions, 5 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index dcbf6afe27e7..bf5f44b27b7e 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -594,7 +594,6 @@ static bool setsockopt_needs_rtnl(int optname) case MCAST_LEAVE_GROUP: case MCAST_LEAVE_SOURCE_GROUP: case MCAST_UNBLOCK_SOURCE: - case IP_ROUTER_ALERT: return true; } return false; diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c index d752a70855d8..f6be5db16da2 100644 --- a/net/ipv4/ipmr.c +++ b/net/ipv4/ipmr.c @@ -1399,7 +1399,7 @@ static void mrtsock_destruct(struct sock *sk) struct net *net = sock_net(sk); struct mr_table *mrt; - ASSERT_RTNL(); + rtnl_lock(); ipmr_for_each_table(mrt, net) { if (sk == rtnl_dereference(mrt->mroute_sk)) { IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; @@ -1411,6 +1411,7 @@ static void mrtsock_destruct(struct sock *sk) mroute_clean_tables(mrt, false); } } + rtnl_unlock(); } /* Socket options and virtual interface manipulation. The whole @@ -1475,8 +1476,13 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, if (sk != rcu_access_pointer(mrt->mroute_sk)) { ret = -EACCES; } else { + /* We need to unlock here because mrtsock_destruct takes + * care of rtnl itself and we can't change that due to + * the IP_ROUTER_ALERT setsockopt which runs without it. + */ + rtnl_unlock(); ret = ip_ra_control(sk, 0, NULL); - goto out_unlock; + goto out; } break; case MRT_ADD_VIF: @@ -1588,6 +1594,7 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, } out_unlock: rtnl_unlock(); +out: return ret; } diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c index 54648d20bf0f..720bef7da2f6 100644 --- a/net/ipv4/raw.c +++ b/net/ipv4/raw.c @@ -711,9 +711,7 @@ static void raw_close(struct sock *sk, long timeout) /* * Raw sockets may have direct kernel references. Kill them. */ - rtnl_lock(); ip_ra_control(sk, 0, NULL); - rtnl_unlock(); sk_common_release(sk); } |