gtp: Destroy device along with udp socket's netns dismantle.

In the Linux kernel, the following vulnerability has been resolved:

gtp: Destroy device along with udp socket's netns dismantle.

gtp_newlink() links the device to a list in dev_net(dev) instead of

src_net, where a udp tunnel socket is created.

Even when src_net is removed, the device stays alive on dev_net(dev).

Then, removing src_net triggers the splat below. [0]

In this example, gtp0 is created in ns2, and the udp socket is created

in ns1.

ip netns add ns1

ip netns add ns2

ip -n ns1 link add netns ns2 name gtp0 type gtp role sgsn

ip netns del ns1

Let's link the device to the socket's netns instead.

Now, gtp_net_exit_batch_rtnl() needs another netdev iteration to remove

all gtp devices in the netns.

[0]:

ref_tracker: net notrefcnt@000000003d6e7d05 has 1/2 users at

sk_alloc (./include/net/net_namespace.h:345 net/core/sock.c:2236)

inet_create (net/ipv4/af_inet.c:326 net/ipv4/af_inet.c:252)

__sock_create (net/socket.c:1558)

udp_sock_create4 (net/ipv4/udp_tunnel_core.c:18)

gtp_create_sock (./include/net/udp_tunnel.h:59 drivers/net/gtp.c:1423)

gtp_create_sockets (drivers/net/gtp.c:1447)

gtp_newlink (drivers/net/gtp.c:1507)

rtnl_newlink (net/core/rtnetlink.c:3786 net/core/rtnetlink.c:3897 net/core/rtnetlink.c:4012)

rtnetlink_rcv_msg (net/core/rtnetlink.c:6922)

netlink_rcv_skb (net/netlink/af_netlink.c:2542)

netlink_unicast (net/netlink/af_netlink.c:1321 net/netlink/af_netlink.c:1347)

netlink_sendmsg (net/netlink/af_netlink.c:1891)

____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2583)

___sys_sendmsg (net/socket.c:2639)

__sys_sendmsg (net/socket.c:2669)

do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)

WARNING: CPU: 1 PID: 60 at lib/ref_tracker.c:179 ref_tracker_dir_exit (lib/ref_tracker.c:179)

Modules linked in:

CPU: 1 UID: 0 PID: 60 Comm: kworker/u16:2 Not tainted 6.13.0-rc5-00147-g4c1224501e9d #5

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014

Workqueue: netns cleanup_net

RIP: 0010:ref_tracker_dir_exit (lib/ref_tracker.c:179)

Code: 00 00 00 fc ff df 4d 8b 26 49 bd 00 01 00 00 00 00 ad de 4c 39 f5 0f 85 df 00 00 00 48 8b 74 24 08 48 89 df e8 a5 cc 12 02 90 <0f> 0b 90 48 8d 6b 44 be 04 00 00 00 48 89 ef e8 80 de 67 ff 48 89

RSP: 0018:ff11000009a07b60 EFLAGS: 00010286

RAX: 0000000000002bd3 RBX: ff1100000f4e1aa0 RCX: 1ffffffff0e40ac6

RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8423ee3c

RBP: ff1100000f4e1af0 R08: 0000000000000001 R09: fffffbfff0e395ae

R10: 0000000000000001 R11: 0000000000036001 R12: ff1100000f4e1af0

R13: dead000000000100 R14: ff1100000f4e1af0 R15: dffffc0000000000

FS: 0000000000000000(0000) GS:ff1100006ce80000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f9b2464bd98 CR3: 0000000005286005 CR4: 0000000000771ef0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400

PKRU: 55555554

Call Trace:

<TASK>

? __warn (kernel/panic.c:748)

? ref_tracker_dir_exit (lib/ref_tracker.c:179)

? report_bug (lib/bug.c:201 lib/bug.c:219)

? handle_bug (arch/x86/kernel/traps.c:285)

? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))

? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)

? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:97 ./arch/x86/include/asm/irqflags.h:155 ./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194)

? ref_tracker_dir_exit (lib/ref_tracker.c:179)

? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:158)

? kfree (mm/slub.c:4613 mm/slub.c:4761)

net_free (net/core/net_namespace.c:476 net/core/net_namespace.c:467)

cleanup_net (net/core/net_namespace.c:664 (discriminator 3))

process_one_work (kernel/workqueue.c:3229)

worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391

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