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From: Kuniyuki Iwashima To: Zhu Yanjun , Jason Gunthorpe , Leon Romanovsky Cc: David Ahern , Kuniyuki Iwashima , Kuniyuki Iwashima , linux-rdma@vger.kernel.org, syzbot+d8f76778263ab65c2b21@syzkaller.appspotmail.com Content-Type: text/plain; charset="UTF-8" syzbot reported null-ptr-deref in kernel_sock_shutdown(). [0] The problem is ->newlink() and ->dellink() can be called concurrently with no synchronisation, leading sk leak or double free, etc. We defer UDP tunnel allocation to the first device creation, but this would requrie per-netns locking. Let's allocate UDP tunnels in the __init_net hook. Now extra sock_hold() and __sock_put() are no longer needed. Note that rxe_ns_pernet_sk6() is broken and will be fixed in the following patch. [0]: Oops: general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f] CPU: 3 UID: 0 PID: 12652 Comm: syz.7.1709 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:kernel_sock_shutdown+0x47/0x70 net/socket.c:3785 Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 33 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 20 49 8d 7c 24 68 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 1a 49 8b 44 24 68 89 ee 48 89 df 5b 5d 41 5c e9 46 RSP: 0018:ffffc9000566f180 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888058587240 RCX: 0000000000000000 RDX: 000000000000000d RSI: ffffffff895ced12 RDI: 0000000000000068 RBP: 0000000000000002 R08: 0000000000000001 R09: ffffed1006d98945 R10: ffff888036cc4a2b R11: 0000003683c25c00 R12: 0000000000000000 R13: ffff88805c998000 R14: 0000000000000002 R15: 0000000000000018 FS: 00007f1306d976c0(0000) GS:ffff8880d65db000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1306d97d58 CR3: 00000000404f1000 CR4: 0000000000352ef0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000002 DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: udp_tunnel_sock_release+0x68/0x80 net/ipv4/udp_tunnel_core.c:202 rxe_release_udp_tunnel drivers/infiniband/sw/rxe/rxe_net.c:294 [inline] rxe_sock_put+0xae/0x130 drivers/infiniband/sw/rxe/rxe_net.c:639 rxe_net_del+0x83/0x120 drivers/infiniband/sw/rxe/rxe_net.c:660 rxe_dellink+0x15/0x20 drivers/infiniband/sw/rxe/rxe.c:254 nldev_dellink+0x289/0x3c0 drivers/infiniband/core/nldev.c:1849 rdma_nl_rcv_msg+0x392/0x6f0 drivers/infiniband/core/netlink.c:195 rdma_nl_rcv_skb.constprop.0.isra.0+0x2cb/0x410 drivers/infiniband/core/netlink.c:239 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg net/socket.c:802 [inline] ____sys_sendmsg+0x9e1/0xb70 net/socket.c:2698 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2752 __sys_sendmsg+0x170/0x220 net/socket.c:2784 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1305f9c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1306d97028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f1306216090 RCX: 00007f1305f9c819 RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 0000000000000003 RBP: 00007f1306032c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1306216128 R14: 00007f1306216090 R15: 00007ffd8ecad288 Modules linked in: Fixes: f1327abd6abe ("RDMA/rxe: Support RDMA link creation and destruction per net namespace") Reported-by: syzbot+d8f76778263ab65c2b21@syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/69ea344f.a00a0220.17a17.0040.GAE@google.com/ Signed-off-by: Kuniyuki Iwashima --- v2: Set up UDP tunnels in __net_init instead of adding mutex. v1: https://lore.kernel.org/all/20260424013759.728288-1-kuniyu@google.com/ --- drivers/infiniband/sw/rxe/rxe.c | 6 -- drivers/infiniband/sw/rxe/rxe_net.c | 126 ++-------------------------- drivers/infiniband/sw/rxe/rxe_net.h | 5 +- drivers/infiniband/sw/rxe/rxe_ns.c | 90 +++++++++----------- drivers/infiniband/sw/rxe/rxe_ns.h | 1 - 5 files changed, 47 insertions(+), 181 deletions(-) diff --git a/drivers/infiniband/sw/rxe/rxe.c b/drivers/infiniband/sw/rxe/rxe.c index b0714f9abe3d..111ba4e57261 100644 --- a/drivers/infiniband/sw/rxe/rxe.c +++ b/drivers/infiniband/sw/rxe/rxe.c @@ -236,10 +236,6 @@ static int rxe_newlink(const char *ibdev_name, struct net_device *ndev) goto err; } - err = rxe_net_init(ndev); - if (err) - return err; - err = rxe_net_add(ibdev_name, ndev); if (err) { rxe_err("failed to add %s\n", ndev->name); @@ -251,8 +247,6 @@ static int rxe_newlink(const char *ibdev_name, struct net_device *ndev) static int rxe_dellink(struct ib_device *dev) { - rxe_net_del(dev); - return 0; } diff --git a/drivers/infiniband/sw/rxe/rxe_net.c b/drivers/infiniband/sw/rxe/rxe_net.c index 50a2cb5405e2..9080d4c893a1 100644 --- a/drivers/infiniband/sw/rxe/rxe_net.c +++ b/drivers/infiniband/sw/rxe/rxe_net.c @@ -256,8 +256,8 @@ static int rxe_udp_encap_recv(struct sock *sk, struct sk_buff *skb) return 0; } -static struct socket *rxe_setup_udp_tunnel(struct net *net, __be16 port, - bool ipv6) +struct sock *rxe_setup_udp_tunnel(struct net *net, __be16 port, + bool ipv6) { int err; struct socket *sock; @@ -285,13 +285,12 @@ static struct socket *rxe_setup_udp_tunnel(struct net *net, __be16 port, /* Setup UDP tunnel */ setup_udp_tunnel_sock(net, sock, &tnl_cfg); - return sock; + return sock->sk; } -static void rxe_release_udp_tunnel(struct socket *sk) +void rxe_release_udp_tunnel(struct sock *sk) { - if (sk) - udp_tunnel_sock_release(sk); + udp_tunnel_sock_release(sk->sk_socket); } static void prepare_udp_hdr(struct sk_buff *skb, __be16 src_port, @@ -629,43 +628,6 @@ int rxe_net_add(const char *ibdev_name, struct net_device *ndev) return 0; } -static void rxe_sock_put(struct sock *sk, - void (*set_sk)(struct net *, struct sock *), - struct net *net) -{ - if (refcount_read(&sk->sk_refcnt) > SK_REF_FOR_TUNNEL) { - __sock_put(sk); - } else { - rxe_release_udp_tunnel(sk->sk_socket); - sk = NULL; - set_sk(net, sk); - } -} - -void rxe_net_del(struct ib_device *dev) -{ - struct rxe_dev *rxe = container_of(dev, struct rxe_dev, ib_dev); - struct net_device *ndev; - struct sock *sk; - struct net *net; - - ndev = rxe_ib_device_get_netdev(&rxe->ib_dev); - if (!ndev) - return; - - net = dev_net(ndev); - - sk = rxe_ns_pernet_sk4(net); - if (sk) - rxe_sock_put(sk, rxe_ns_pernet_set_sk4, net); - - sk = rxe_ns_pernet_sk6(net); - if (sk) - rxe_sock_put(sk, rxe_ns_pernet_set_sk6, net); - - dev_put(ndev); -} - static void rxe_port_event(struct rxe_dev *rxe, enum ib_event_type event) { @@ -722,7 +684,6 @@ static int rxe_notify(struct notifier_block *not_blk, switch (event) { case NETDEV_UNREGISTER: ib_unregister_device_queued(&rxe->ib_dev); - rxe_net_del(&rxe->ib_dev); break; case NETDEV_CHANGEMTU: rxe_dbg_dev(rxe, "%s changed mtu to %d\n", ndev->name, ndev->mtu); @@ -752,56 +713,6 @@ static struct notifier_block rxe_net_notifier = { .notifier_call = rxe_notify, }; -static int rxe_net_ipv4_init(struct net *net) -{ - struct sock *sk; - struct socket *sock; - - sk = rxe_ns_pernet_sk4(net); - if (sk) { - sock_hold(sk); - return 0; - } - - sock = rxe_setup_udp_tunnel(net, htons(ROCE_V2_UDP_DPORT), false); - if (IS_ERR(sock)) { - pr_err("Failed to create IPv4 UDP tunnel\n"); - return -1; - } - rxe_ns_pernet_set_sk4(net, sock->sk); - - return 0; -} - -static int rxe_net_ipv6_init(struct net *net) -{ -#if IS_ENABLED(CONFIG_IPV6) - struct sock *sk; - struct socket *sock; - - sk = rxe_ns_pernet_sk6(net); - if (sk) { - sock_hold(sk); - return 0; - } - - sock = rxe_setup_udp_tunnel(net, htons(ROCE_V2_UDP_DPORT), true); - if (PTR_ERR(sock) == -EAFNOSUPPORT) { - pr_warn("IPv6 is not supported, can not create a UDPv6 socket\n"); - return 0; - } - - if (IS_ERR(sock)) { - pr_err("Failed to create IPv6 UDP tunnel\n"); - return -1; - } - - rxe_ns_pernet_set_sk6(net, sock->sk); - -#endif - return 0; -} - int rxe_register_notifier(void) { int err; @@ -819,30 +730,3 @@ void rxe_net_exit(void) { unregister_netdevice_notifier(&rxe_net_notifier); } - -int rxe_net_init(struct net_device *ndev) -{ - struct net *net; - struct sock *sk; - int err; - - net = dev_net(ndev); - - err = rxe_net_ipv4_init(net); - if (err) - return err; - - err = rxe_net_ipv6_init(net); - if (err) - goto err_out; - - return 0; - -err_out: - /* If ipv6 error, release ipv4 resource */ - sk = rxe_ns_pernet_sk4(net); - if (sk) - rxe_sock_put(sk, rxe_ns_pernet_set_sk4, net); - - return err; -} diff --git a/drivers/infiniband/sw/rxe/rxe_net.h b/drivers/infiniband/sw/rxe/rxe_net.h index 56249677d692..592b0e577f32 100644 --- a/drivers/infiniband/sw/rxe/rxe_net.h +++ b/drivers/infiniband/sw/rxe/rxe_net.h @@ -11,11 +11,12 @@ #include #include +struct sock *rxe_setup_udp_tunnel(struct net *net, __be16 port, bool ipv6); +void rxe_release_udp_tunnel(struct sock *sk); + int rxe_net_add(const char *ibdev_name, struct net_device *ndev); -void rxe_net_del(struct ib_device *dev); int rxe_register_notifier(void); -int rxe_net_init(struct net_device *ndev); void rxe_net_exit(void); #endif /* RXE_NET_H */ diff --git a/drivers/infiniband/sw/rxe/rxe_ns.c b/drivers/infiniband/sw/rxe/rxe_ns.c index 8b9d734229b2..06eb2e2387a1 100644 --- a/drivers/infiniband/sw/rxe/rxe_ns.c +++ b/drivers/infiniband/sw/rxe/rxe_ns.c @@ -7,8 +7,10 @@ #include #include #include +#include #include "rxe_ns.h" +#include "rxe_net.h" /* * Per network namespace data @@ -23,40 +25,54 @@ struct rxe_ns_sock { */ static unsigned int rxe_pernet_id; -/* - * Called for every existing and added network namespaces - */ -static int rxe_ns_init(struct net *net) +static __net_init int rxe_ns_init(struct net *net) { - /* defer socket create in the namespace to the first - * device create. - */ + struct rxe_ns_sock *ns_sk = net_generic(net, rxe_pernet_id); + struct sock *sk; + int err = 0; + + sk = rxe_setup_udp_tunnel(net, htons(ROCE_V2_UDP_DPORT), false); + if (IS_ERR(sk)) { + err = PTR_ERR(sk); + goto out; + } + + RCU_INIT_POINTER(ns_sk->rxe_sk4, sk); + +#if IS_ENABLED(CONFIG_IPV6) + sk = rxe_setup_udp_tunnel(net, htons(ROCE_V2_UDP_DPORT), true); + if (IS_ERR(sk)) { + err = PTR_ERR(sk); + if (err == -EAFNOSUPPORT) { + err = 0; + goto out; + } + + sk = rcu_dereference_protected(ns_sk->rxe_sk4, 1); + rxe_release_udp_tunnel(sk); + goto out; + } - return 0; + RCU_INIT_POINTER(ns_sk->rxe_sk6, sk); +#endif +out: + return err; } -static void rxe_ns_exit(struct net *net) +static __net_exit void rxe_ns_exit(struct net *net) { - /* called when the network namespace is removed - */ struct rxe_ns_sock *ns_sk = net_generic(net, rxe_pernet_id); struct sock *sk; - rcu_read_lock(); - sk = rcu_dereference(ns_sk->rxe_sk4); - rcu_read_unlock(); - if (sk) { - rcu_assign_pointer(ns_sk->rxe_sk4, NULL); - udp_tunnel_sock_release(sk->sk_socket); - } + sk = rcu_dereference_protected(ns_sk->rxe_sk4, 1); + RCU_INIT_POINTER(ns_sk->rxe_sk4, NULL); + rxe_release_udp_tunnel(sk); #if IS_ENABLED(CONFIG_IPV6) - rcu_read_lock(); - sk = rcu_dereference(ns_sk->rxe_sk6); - rcu_read_unlock(); + sk = rcu_dereference_protected(ns_sk->rxe_sk6, 1); if (sk) { - rcu_assign_pointer(ns_sk->rxe_sk6, NULL); - udp_tunnel_sock_release(sk->sk_socket); + RCU_INIT_POINTER(ns_sk->rxe_sk6, NULL); + rxe_release_udp_tunnel(sk); } #endif } @@ -71,26 +87,6 @@ static struct pernet_operations rxe_net_ops = { .size = sizeof(struct rxe_ns_sock), }; -struct sock *rxe_ns_pernet_sk4(struct net *net) -{ - struct rxe_ns_sock *ns_sk = net_generic(net, rxe_pernet_id); - struct sock *sk; - - rcu_read_lock(); - sk = rcu_dereference(ns_sk->rxe_sk4); - rcu_read_unlock(); - - return sk; -} - -void rxe_ns_pernet_set_sk4(struct net *net, struct sock *sk) -{ - struct rxe_ns_sock *ns_sk = net_generic(net, rxe_pernet_id); - - rcu_assign_pointer(ns_sk->rxe_sk4, sk); - synchronize_rcu(); -} - #if IS_ENABLED(CONFIG_IPV6) struct sock *rxe_ns_pernet_sk6(struct net *net) { @@ -103,14 +99,6 @@ struct sock *rxe_ns_pernet_sk6(struct net *net) return sk; } - -void rxe_ns_pernet_set_sk6(struct net *net, struct sock *sk) -{ - struct rxe_ns_sock *ns_sk = net_generic(net, rxe_pernet_id); - - rcu_assign_pointer(ns_sk->rxe_sk6, sk); - synchronize_rcu(); -} #endif /* IPV6 */ int rxe_namespace_init(void) diff --git a/drivers/infiniband/sw/rxe/rxe_ns.h b/drivers/infiniband/sw/rxe/rxe_ns.h index 4da2709e6b71..7f48d624fa05 100644 --- a/drivers/infiniband/sw/rxe/rxe_ns.h +++ b/drivers/infiniband/sw/rxe/rxe_ns.h @@ -3,7 +3,6 @@ #ifndef RXE_NS_H #define RXE_NS_H -struct sock *rxe_ns_pernet_sk4(struct net *net); void rxe_ns_pernet_set_sk4(struct net *net, struct sock *sk); #if IS_ENABLED(CONFIG_IPV6) -- 2.54.0.rc2.544.gc7ae2d5bb8-goog