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8fe08d70a2
sk_diag_put_flags(), netlink_setsockopt(), netlink_getsockopt() and others use nlk->flags without correct locking. Use set_bit(), clear_bit(), test_bit(), assign_bit() to remove data-races. Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Simon Horman <horms@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
81 lines
2 KiB
C
81 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _AF_NETLINK_H
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#define _AF_NETLINK_H
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#include <linux/rhashtable.h>
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#include <linux/atomic.h>
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#include <linux/workqueue.h>
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#include <net/sock.h>
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/* flags */
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enum {
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NETLINK_F_KERNEL_SOCKET,
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NETLINK_F_RECV_PKTINFO,
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NETLINK_F_BROADCAST_SEND_ERROR,
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NETLINK_F_RECV_NO_ENOBUFS,
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NETLINK_F_LISTEN_ALL_NSID,
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NETLINK_F_CAP_ACK,
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NETLINK_F_EXT_ACK,
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NETLINK_F_STRICT_CHK,
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};
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#define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8)
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#define NLGRPLONGS(x) (NLGRPSZ(x)/sizeof(unsigned long))
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struct netlink_sock {
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/* struct sock has to be the first member of netlink_sock */
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struct sock sk;
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unsigned long flags;
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u32 portid;
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u32 dst_portid;
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u32 dst_group;
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u32 subscriptions;
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u32 ngroups;
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unsigned long *groups;
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unsigned long state;
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size_t max_recvmsg_len;
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wait_queue_head_t wait;
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bool bound;
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bool cb_running;
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int dump_done_errno;
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struct netlink_callback cb;
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struct mutex *cb_mutex;
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struct mutex cb_def_mutex;
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void (*netlink_rcv)(struct sk_buff *skb);
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int (*netlink_bind)(struct net *net, int group);
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void (*netlink_unbind)(struct net *net, int group);
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void (*netlink_release)(struct sock *sk,
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unsigned long *groups);
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struct module *module;
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struct rhash_head node;
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struct rcu_head rcu;
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struct work_struct work;
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};
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static inline struct netlink_sock *nlk_sk(struct sock *sk)
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{
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return container_of(sk, struct netlink_sock, sk);
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}
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#define nlk_test_bit(nr, sk) test_bit(NETLINK_F_##nr, &nlk_sk(sk)->flags)
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struct netlink_table {
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struct rhashtable hash;
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struct hlist_head mc_list;
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struct listeners __rcu *listeners;
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unsigned int flags;
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unsigned int groups;
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struct mutex *cb_mutex;
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struct module *module;
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int (*bind)(struct net *net, int group);
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void (*unbind)(struct net *net, int group);
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void (*release)(struct sock *sk,
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unsigned long *groups);
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int registered;
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};
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extern struct netlink_table *nl_table;
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extern rwlock_t nl_table_lock;
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#endif
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