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c3317f4db8
When a topology subscription is created, we may encounter (or KASAN
may provoke) a failure to create a corresponding service instance in
the binding table. Instead of letting the tipc_nametbl_subscribe()
report the failure back to the caller, the function just makes a warning
printout and returns, without incrementing the subscription reference
counter as expected by the caller.
This makes the caller believe that the subscription was successful, so
it will at a later moment try to unsubscribe the item. This involves
a sub_put() call. Since the reference counter never was incremented
in the first place, we get a premature delete of the subscription item,
followed by a "use-after-free" warning.
We fix this by adding a return value to tipc_nametbl_subscribe() and
make the caller aware of the failure to subscribe.
This bug seems to always have been around, but this fix only applies
back to the commit shown below. Given the low risk of this happening
we believe this to be sufficient.
Fixes: commit 218527fe27 ("tipc: replace name table service range
array with rb tree")
Reported-by: syzbot+aa245f26d42b8305d157@syzkaller.appspotmail.com
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
153 lines
6.1 KiB
C
153 lines
6.1 KiB
C
/*
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* net/tipc/name_table.h: Include file for TIPC name table code
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*
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* Copyright (c) 2000-2006, 2014-2018, Ericsson AB
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* Copyright (c) 2004-2005, 2010-2011, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _TIPC_NAME_TABLE_H
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#define _TIPC_NAME_TABLE_H
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struct tipc_subscription;
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struct tipc_plist;
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struct tipc_nlist;
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struct tipc_group;
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/*
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* TIPC name types reserved for internal TIPC use (both current and planned)
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*/
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#define TIPC_ZM_SRV 3 /* zone master service name type */
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#define TIPC_PUBL_SCOPE_NUM (TIPC_NODE_SCOPE + 1)
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#define TIPC_NAMETBL_SIZE 1024 /* must be a power of 2 */
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/**
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* struct publication - info about a published (name or) name sequence
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* @type: name sequence type
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* @lower: name sequence lower bound
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* @upper: name sequence upper bound
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* @scope: scope of publication, TIPC_NODE_SCOPE or TIPC_CLUSTER_SCOPE
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* @node: network address of publishing socket's node
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* @port: publishing port
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* @key: publication key, unique across the cluster
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* @binding_node: all publications from the same node which bound this one
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* - Remote publications: in node->publ_list
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* Used by node/name distr to withdraw publications when node is lost
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* - Local/node scope publications: in name_table->node_scope list
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* - Local/cluster scope publications: in name_table->cluster_scope list
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* @binding_sock: all publications from the same socket which bound this one
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* Used by socket to withdraw publications when socket is unbound/released
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* @local_publ: list of identical publications made from this node
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* Used by closest_first and multicast receive lookup algorithms
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* @all_publ: all publications identical to this one, whatever node and scope
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* Used by round-robin lookup algorithm
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* @rcu: RCU callback head used for deferred freeing
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*/
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struct publication {
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u32 type;
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u32 lower;
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u32 upper;
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u32 scope;
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u32 node;
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u32 port;
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u32 key;
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struct list_head binding_node;
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struct list_head binding_sock;
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struct list_head local_publ;
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struct list_head all_publ;
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struct rcu_head rcu;
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};
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/**
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* struct name_table - table containing all existing port name publications
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* @seq_hlist: name sequence hash lists
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* @node_scope: all local publications with node scope
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* - used by name_distr during re-init of name table
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* @cluster_scope: all local publications with cluster scope
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* - used by name_distr to send bulk updates to new nodes
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* - used by name_distr during re-init of name table
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* @local_publ_count: number of publications issued by this node
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*/
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struct name_table {
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struct hlist_head services[TIPC_NAMETBL_SIZE];
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struct list_head node_scope;
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struct list_head cluster_scope;
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u32 local_publ_count;
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};
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int tipc_nl_name_table_dump(struct sk_buff *skb, struct netlink_callback *cb);
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u32 tipc_nametbl_translate(struct net *net, u32 type, u32 instance, u32 *node);
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void tipc_nametbl_mc_lookup(struct net *net, u32 type, u32 lower, u32 upper,
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u32 scope, bool exact, struct list_head *dports);
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void tipc_nametbl_build_group(struct net *net, struct tipc_group *grp,
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u32 type, u32 domain);
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void tipc_nametbl_lookup_dst_nodes(struct net *net, u32 type, u32 lower,
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u32 upper, struct tipc_nlist *nodes);
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bool tipc_nametbl_lookup(struct net *net, u32 type, u32 instance, u32 domain,
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struct list_head *dsts, int *dstcnt, u32 exclude,
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bool all);
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struct publication *tipc_nametbl_publish(struct net *net, u32 type, u32 lower,
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u32 upper, u32 scope, u32 port,
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u32 key);
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int tipc_nametbl_withdraw(struct net *net, u32 type, u32 lower, u32 upper,
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u32 key);
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struct publication *tipc_nametbl_insert_publ(struct net *net, u32 type,
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u32 lower, u32 upper, u32 scope,
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u32 node, u32 ref, u32 key);
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struct publication *tipc_nametbl_remove_publ(struct net *net, u32 type,
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u32 lower, u32 upper,
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u32 node, u32 key);
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bool tipc_nametbl_subscribe(struct tipc_subscription *s);
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void tipc_nametbl_unsubscribe(struct tipc_subscription *s);
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int tipc_nametbl_init(struct net *net);
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void tipc_nametbl_stop(struct net *net);
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struct tipc_dest {
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struct list_head list;
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union {
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struct {
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u32 port;
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u32 node;
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};
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u64 value;
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};
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};
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struct tipc_dest *tipc_dest_find(struct list_head *l, u32 node, u32 port);
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bool tipc_dest_push(struct list_head *l, u32 node, u32 port);
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bool tipc_dest_pop(struct list_head *l, u32 *node, u32 *port);
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bool tipc_dest_del(struct list_head *l, u32 node, u32 port);
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void tipc_dest_list_purge(struct list_head *l);
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int tipc_dest_list_len(struct list_head *l);
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#endif
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