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linux-next/net/tipc/netlink.c
Cong Wang 9a07efa9ae tipc: switch to rhashtable iterator 
syzbot reported a use-after-free in tipc_group_fill_sock_diag(),
where tipc_group_fill_sock_diag() still reads tsk->group meanwhile
tipc_group_delete() just deletes it in tipc_release().

tipc_nl_sk_walk() aims to lock this sock when walking each sock
in the hash table to close race conditions with sock changes like
this one, by acquiring tsk->sk.sk_lock.slock spinlock, unfortunately
this doesn't work at all. All non-BH call path should take
lock_sock() instead to make it work.

tipc_nl_sk_walk() brutally iterates with raw rht_for_each_entry_rcu()
where RCU read lock is required, this is the reason why lock_sock()
can't be taken on this path. This could be resolved by switching to
rhashtable iterator API's, where taking a sleepable lock is possible.
Also, the iterator API's are friendly for restartable calls like
diag dump, the last position is remembered behind the scence,
all we need to do here is saving the iterator into cb->args[].

I tested this with parallel tipc diag dump and thousands of tipc
socket creation and release, no crash or memory leak.

Reported-by: syzbot+b9c8f3ab2994b7cd1625@syzkaller.appspotmail.com
Cc: Jon Maloy <jon.maloy@ericsson.com>
Cc: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-08-29 18:04:54 -07:00

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/*
* net/tipc/netlink.c: TIPC configuration handling
*
* Copyright (c) 2005-2006, 2014, Ericsson AB
* Copyright (c) 2005-2007, Wind River Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "core.h"
#include "socket.h"
#include "name_table.h"
#include "bearer.h"
#include "link.h"
#include "node.h"
#include "net.h"
#include "udp_media.h"
#include <net/genetlink.h>
static const struct nla_policy tipc_nl_policy[TIPC_NLA_MAX + 1] = {
[TIPC_NLA_UNSPEC] = { .type = NLA_UNSPEC, },
[TIPC_NLA_BEARER] = { .type = NLA_NESTED, },
[TIPC_NLA_SOCK] = { .type = NLA_NESTED, },
[TIPC_NLA_PUBL] = { .type = NLA_NESTED, },
[TIPC_NLA_LINK] = { .type = NLA_NESTED, },
[TIPC_NLA_MEDIA] = { .type = NLA_NESTED, },
[TIPC_NLA_NODE] = { .type = NLA_NESTED, },
[TIPC_NLA_NET] = { .type = NLA_NESTED, },
[TIPC_NLA_NAME_TABLE] = { .type = NLA_NESTED, },
[TIPC_NLA_MON] = { .type = NLA_NESTED, },
};
const struct nla_policy
tipc_nl_name_table_policy[TIPC_NLA_NAME_TABLE_MAX + 1] = {
[TIPC_NLA_NAME_TABLE_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_NAME_TABLE_PUBL] = { .type = NLA_NESTED }
};
const struct nla_policy tipc_nl_monitor_policy[TIPC_NLA_MON_MAX + 1] = {
[TIPC_NLA_MON_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_MON_REF] = { .type = NLA_U32 },
[TIPC_NLA_MON_ACTIVATION_THRESHOLD] = { .type = NLA_U32 },
};
const struct nla_policy tipc_nl_sock_policy[TIPC_NLA_SOCK_MAX + 1] = {
[TIPC_NLA_SOCK_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_SOCK_ADDR] = { .type = NLA_U32 },
[TIPC_NLA_SOCK_REF] = { .type = NLA_U32 },
[TIPC_NLA_SOCK_CON] = { .type = NLA_NESTED },
[TIPC_NLA_SOCK_HAS_PUBL] = { .type = NLA_FLAG }
};
const struct nla_policy tipc_nl_net_policy[TIPC_NLA_NET_MAX + 1] = {
[TIPC_NLA_NET_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_NET_ID] = { .type = NLA_U32 },
[TIPC_NLA_NET_ADDR] = { .type = NLA_U32 },
[TIPC_NLA_NET_NODEID] = { .type = NLA_U64 },
[TIPC_NLA_NET_NODEID_W1] = { .type = NLA_U64 },
};
const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = {
[TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_LINK_NAME] = { .type = NLA_STRING,
.len = TIPC_MAX_LINK_NAME },
[TIPC_NLA_LINK_MTU] = { .type = NLA_U32 },
[TIPC_NLA_LINK_BROADCAST] = { .type = NLA_FLAG },
[TIPC_NLA_LINK_UP] = { .type = NLA_FLAG },
[TIPC_NLA_LINK_ACTIVE] = { .type = NLA_FLAG },
[TIPC_NLA_LINK_PROP] = { .type = NLA_NESTED },
[TIPC_NLA_LINK_STATS] = { .type = NLA_NESTED },
[TIPC_NLA_LINK_RX] = { .type = NLA_U32 },
[TIPC_NLA_LINK_TX] = { .type = NLA_U32 }
};
const struct nla_policy tipc_nl_node_policy[TIPC_NLA_NODE_MAX + 1] = {
[TIPC_NLA_NODE_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_NODE_ADDR] = { .type = NLA_U32 },
[TIPC_NLA_NODE_UP] = { .type = NLA_FLAG }
};
/* Properties valid for media, bearer and link */
const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
[TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 },
[TIPC_NLA_PROP_TOL] = { .type = NLA_U32 },
[TIPC_NLA_PROP_WIN] = { .type = NLA_U32 }
};
const struct nla_policy tipc_nl_bearer_policy[TIPC_NLA_BEARER_MAX + 1] = {
[TIPC_NLA_BEARER_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_BEARER_NAME] = { .type = NLA_STRING,
.len = TIPC_MAX_BEARER_NAME },
[TIPC_NLA_BEARER_PROP] = { .type = NLA_NESTED },
[TIPC_NLA_BEARER_DOMAIN] = { .type = NLA_U32 }
};
const struct nla_policy tipc_nl_media_policy[TIPC_NLA_MEDIA_MAX + 1] = {
[TIPC_NLA_MEDIA_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_MEDIA_NAME] = { .type = NLA_STRING },
[TIPC_NLA_MEDIA_PROP] = { .type = NLA_NESTED }
};
const struct nla_policy tipc_nl_udp_policy[TIPC_NLA_UDP_MAX + 1] = {
[TIPC_NLA_UDP_UNSPEC] = {.type = NLA_UNSPEC},
[TIPC_NLA_UDP_LOCAL] = {.type = NLA_BINARY,
.len = sizeof(struct sockaddr_storage)},
[TIPC_NLA_UDP_REMOTE] = {.type = NLA_BINARY,
.len = sizeof(struct sockaddr_storage)},
};
/* Users of the legacy API (tipc-config) can't handle that we add operations,
* so we have a separate genl handling for the new API.
*/
static const struct genl_ops tipc_genl_v2_ops[] = {
{
.cmd = TIPC_NL_BEARER_DISABLE,
.doit = tipc_nl_bearer_disable,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_BEARER_ENABLE,
.doit = tipc_nl_bearer_enable,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_BEARER_GET,
.doit = tipc_nl_bearer_get,
.dumpit = tipc_nl_bearer_dump,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_BEARER_ADD,
.doit = tipc_nl_bearer_add,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_BEARER_SET,
.doit = tipc_nl_bearer_set,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_SOCK_GET,
.start = tipc_dump_start,
.dumpit = tipc_nl_sk_dump,
.done = tipc_dump_done,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_PUBL_GET,
.dumpit = tipc_nl_publ_dump,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_LINK_GET,
.doit = tipc_nl_node_get_link,
.dumpit = tipc_nl_node_dump_link,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_LINK_SET,
.doit = tipc_nl_node_set_link,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_LINK_RESET_STATS,
.doit = tipc_nl_node_reset_link_stats,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_MEDIA_GET,
.doit = tipc_nl_media_get,
.dumpit = tipc_nl_media_dump,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_MEDIA_SET,
.doit = tipc_nl_media_set,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_NODE_GET,
.dumpit = tipc_nl_node_dump,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_NET_GET,
.dumpit = tipc_nl_net_dump,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_NET_SET,
.doit = tipc_nl_net_set,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_NAME_TABLE_GET,
.dumpit = tipc_nl_name_table_dump,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_MON_SET,
.doit = tipc_nl_node_set_monitor,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_MON_GET,
.doit = tipc_nl_node_get_monitor,
.dumpit = tipc_nl_node_dump_monitor,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_MON_PEER_GET,
.dumpit = tipc_nl_node_dump_monitor_peer,
.policy = tipc_nl_policy,
},
{
.cmd = TIPC_NL_PEER_REMOVE,
.doit = tipc_nl_peer_rm,
.policy = tipc_nl_policy,
},
#ifdef CONFIG_TIPC_MEDIA_UDP
{
.cmd = TIPC_NL_UDP_GET_REMOTEIP,
.dumpit = tipc_udp_nl_dump_remoteip,
.policy = tipc_nl_policy,
},
#endif
};
struct genl_family tipc_genl_family __ro_after_init = {
.name = TIPC_GENL_V2_NAME,
.version = TIPC_GENL_V2_VERSION,
.hdrsize = 0,
.maxattr = TIPC_NLA_MAX,
.netnsok = true,
.module = THIS_MODULE,
.ops = tipc_genl_v2_ops,
.n_ops = ARRAY_SIZE(tipc_genl_v2_ops),
};
int tipc_nlmsg_parse(const struct nlmsghdr *nlh, struct nlattr ***attr)
{
u32 maxattr = tipc_genl_family.maxattr;
*attr = genl_family_attrbuf(&tipc_genl_family);
if (!*attr)
return -EOPNOTSUPP;
return nlmsg_parse(nlh, GENL_HDRLEN, *attr, maxattr, tipc_nl_policy,
NULL);
}
int __init tipc_netlink_start(void)
{
int res;
res = genl_register_family(&tipc_genl_family);
if (res) {
pr_err("Failed to register netlink interface\n");
return res;
}
return 0;
}
void tipc_netlink_stop(void)
{
genl_unregister_family(&tipc_genl_family);
}
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