[Linux Kernel Bug] UBSAN: array-index-out-of-bounds in rds_cmsg_recv

[Chenyuan Yang <chenyuan0y@gmail.com>]

[-- Attachment #1: Type: text/plain, Size: 1012 bytes --]

Dear Linux Kernel Developers for Network RDS,

We encountered "UBSAN: array-index-out-of-bounds in rds_cmsg_recv"
when testing the RDS with our generated specifications. The C
reproduce program and logs for this crash are attached.

This crash happens when RDS receives messages by using
`rds_cmsg_recv`, which reads the `j+1` index of the array
`inc->i_rx_lat_trace`
(https://elixir.bootlin.com/linux/v6.7/source/net/rds/recv.c#L585).
The length of `inc->i_rx_lat_trace` array is 4 (defined by
`RDS_RX_MAX_TRACES`,
https://elixir.bootlin.com/linux/v6.7/source/net/rds/rds.h#L289) while
`j` is the value stored in another array `rs->rs_rx_trace`
(https://elixir.bootlin.com/linux/v6.7/source/net/rds/recv.c#L583),
which is sent from others and could be arbitrary value.

This crash might be exploited to read the value out-of-bound from the
array by setting arbitrary values for the array `rs->rs_rx_trace`.

If you have any questions or require more information, please feel
free to contact us.

Best,
Chenyuan

[-- Attachment #2: repro.prog --]
[-- Type: application/octet-stream, Size: 925 bytes --]

# {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Repro:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}
r0 = socket$KGPT_RDS(0x15, 0x5, 0x0)
setsockopt$KGPT_SO_RDS_MSG_RXPATH_LATENCY(r0, 0x114, 0xa, &(0x7f00000000c0)=ANY=[@ANYRES8=r0, @ANYRES16=r0, @ANYRES8=r0, @ANYRESHEX=r0, @ANYRES8=0x0, @ANYRES64=r0, @ANYRES8=0x0, @ANYRES16, @ANYRES32, @ANYRES8], 0x4)
connect$rds(r0, &(0x7f0000000080)={0x2, 0x0, @local}, 0x10)
bind$rds(r0, &(0x7f0000000540)={0x2, 0x0, @local}, 0x10)
sendto$KGPT_rds_proto_ops(r0, 0x0, 0x0, 0x0, 0x0, 0x0)
recvfrom$KGPT_rds_proto_ops(r0, 0x0, 0x0, 0x0, 0x0, 0x0)

[-- Attachment #3: repro.report --]
[-- Type: application/octet-stream, Size: 1925 bytes --]

netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
================================================================================
UBSAN: array-index-out-of-bounds in net/rds/recv.c:585:39
index 4 is out of range for type 'u64 [4]'
CPU: 1 PID: 8058 Comm: syz-executor228 Not tainted 6.6.0-gd2f51b3516da #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x136/0x150 lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:217 [inline]
 __ubsan_handle_out_of_bounds+0xd5/0x130 lib/ubsan.c:348
 rds_cmsg_recv+0x60d/0x700 net/rds/recv.c:585
 rds_recvmsg+0x3fb/0x1610 net/rds/recv.c:716
 sock_recvmsg_nosec net/socket.c:1044 [inline]
 sock_recvmsg+0xe2/0x160 net/socket.c:1066
 __sys_recvfrom+0x1b6/0x2f0 net/socket.c:2246
 __do_sys_recvfrom net/socket.c:2264 [inline]
 __se_sys_recvfrom net/socket.c:2260 [inline]
 __x64_sys_recvfrom+0xe0/0x1b0 net/socket.c:2260
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fdd574dad9d
Code: 28 c3 e8 e6 22 00 00 66 0f 1f 44 00 00 f3 0f 1e fa 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff993d59f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fdd574dad9d
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007fdd57533380 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff993d5a40
R13: 00007fff993d5a60 R14: 00007fdd57567300 R15: 00007fdd57533366
 </TASK>
================================================================================

[-- Attachment #4: repro.log --]
[-- Type: application/octet-stream, Size: 15746 bytes --]


Debian GNU/Linux 11 syzkaller ttyS0

Warning: Permanently added '[localhost]:34396' (ED25519) to the list of known hosts.
syzkaller login: [   76.563563][ T8058] chnl_net:caif_netlink_parms(): no params data found
[   76.658011][ T8058] bridge0: port 1(bridge_slave_0) entered blocking state
[   76.658506][ T8058] bridge0: port 1(bridge_slave_0) entered disabled state
[   76.659084][ T8058] bridge_slave_0: entered allmulticast mode
[   76.660299][ T8058] bridge_slave_0: entered promiscuous mode
[   76.663217][ T8058] bridge0: port 2(bridge_slave_1) entered blocking state
[   76.663702][ T8058] bridge0: port 2(bridge_slave_1) entered disabled state
[   76.664144][ T8058] bridge_slave_1: entered allmulticast mode
[   76.665860][ T8058] bridge_slave_1: entered promiscuous mode
[   76.705902][ T8058] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   76.711053][ T8058] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   76.744093][ T8058] team0: Port device team_slave_0 added
[   76.747721][ T8058] team0: Port device team_slave_1 added
[   76.773132][ T8058] batman_adv: batadv0: Adding interface: batadv_slave_0
[   76.774069][ T8058] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem.
[   76.775801][ T8058] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   76.780194][ T8058] batman_adv: batadv0: Adding interface: batadv_slave_1
[   76.780722][ T8058] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem.
[   76.782464][ T8058] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   76.823268][ T8058] hsr_slave_0: entered promiscuous mode
[   76.824366][ T8058] hsr_slave_1: entered promiscuous mode
[   77.009502][ T8058] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   77.016829][ T8058] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   77.022014][ T8058] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   77.027136][ T8058] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   77.058249][ T8058] bridge0: port 2(bridge_slave_1) entered blocking state
[   77.058848][ T8058] bridge0: port 2(bridge_slave_1) entered forwarding state
[   77.059787][ T8058] bridge0: port 1(bridge_slave_0) entered blocking state
[   77.060270][ T8058] bridge0: port 1(bridge_slave_0) entered forwarding state
[   77.121388][ T8058] 8021q: adding VLAN 0 to HW filter on device bond0
[   77.132911][   T55] bridge0: port 1(bridge_slave_0) entered disabled state
[   77.134359][   T55] bridge0: port 2(bridge_slave_1) entered disabled state
[   77.145134][ T8058] 8021q: adding VLAN 0 to HW filter on device team0
[   77.153978][   T27] bridge0: port 1(bridge_slave_0) entered blocking state
[   77.154733][   T27] bridge0: port 1(bridge_slave_0) entered forwarding state
[   77.170108][   T55] bridge0: port 2(bridge_slave_1) entered blocking state
[   77.170751][   T55] bridge0: port 2(bridge_slave_1) entered forwarding state
[   77.259307][ T8058] 8021q: adding VLAN 0 to HW filter on device batadv0
[   77.319233][ T8058] veth0_vlan: entered promiscuous mode
[   77.331313][ T8058] veth1_vlan: entered promiscuous mode
[   77.362228][ T8058] veth0_macvtap: entered promiscuous mode
[   77.367879][ T8058] veth1_macvtap: entered promiscuous mode
[   77.393904][ T8058] batman_adv: batadv0: Interface activated: batadv_slave_0
[   77.404207][ T8058] batman_adv: batadv0: Interface activated: batadv_slave_1
[   77.409640][ T8058] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   77.410260][ T8058] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   77.410845][ T8058] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   77.411419][ T8058] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
executing program
[   77.476675][ T8058] ================================================================================
[   77.477434][ T8058] UBSAN: array-index-out-of-bounds in net/rds/recv.c:585:39
[   77.477981][ T8058] index 4 is out of range for type 'u64 [4]'
[   77.478419][ T8058] CPU: 1 PID: 8058 Comm: syz-executor228 Not tainted 6.6.0-gd2f51b3516da #1
[   77.479015][ T8058] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
[   77.479836][ T8058] Call Trace:
[   77.480190][ T8058]  <TASK>
[   77.480448][ T8058]  dump_stack_lvl+0x136/0x150
[   77.480825][ T8058]  __ubsan_handle_out_of_bounds+0xd5/0x130
[   77.481488][ T8058]  ? kvm_sched_clock_read+0x16/0x20
[   77.481933][ T8058]  rds_cmsg_recv+0x60d/0x700
[   77.482537][ T8058]  ? rds_recvmsg_zcookie+0x490/0x490
[   77.483058][ T8058]  ? rds_recvmsg+0x695/0x1610
[   77.483436][ T8058]  ? lock_downgrade+0x6a0/0x6a0
[   77.483836][ T8058]  ? _raw_write_unlock_irqrestore+0x54/0x70
[   77.484287][ T8058]  rds_recvmsg+0x3fb/0x1610
[   77.484646][ T8058]  ? rds_notify_queue_get+0x760/0x760
[   77.485120][ T8058]  ? aa_af_perm+0x240/0x240
[   77.485475][ T8058]  ? prepare_to_swait_exclusive+0x240/0x240
[   77.485934][ T8058]  ? bpf_lsm_socket_recvmsg+0x9/0x10
[   77.486345][ T8058]  ? security_socket_recvmsg+0x93/0xc0
[   77.486751][ T8058]  ? rds_notify_queue_get+0x760/0x760
[   77.487175][ T8058]  sock_recvmsg+0xe2/0x160
[   77.487517][ T8058]  __sys_recvfrom+0x1b6/0x2f0
[   77.487876][ T8058]  ? __ia32_sys_send+0x100/0x100
[   77.488261][ T8058]  ? lock_downgrade+0x6a0/0x6a0
[   77.488684][ T8058]  ? __rseq_handle_notify_resume+0x5cf/0x1000
[   77.489175][ T8058]  ? __ia32_sys_socketpair+0x100/0x100
[   77.489590][ T8058]  ? __sys_connect+0x10e/0x1a0
[   77.489963][ T8058]  ? __do_sys_rseq+0x750/0x750
[   77.490362][ T8058]  ? folio_memcg_unlock+0x240/0x240
[   77.490756][ T8058]  __x64_sys_recvfrom+0xe0/0x1b0
[   77.491183][ T8058]  ? syscall_enter_from_user_mode+0x7f/0x120
[   77.491727][ T8058]  do_syscall_64+0x40/0x110
[   77.492118][ T8058]  entry_SYSCALL_64_after_hwframe+0x63/0x6b
[   77.492591][ T8058] RIP: 0033:0x7fdd574dad9d
[   77.492938][ T8058] Code: 28 c3 e8 e6 22 00 00 66 0f 1f 44 00 00 f3 0f 1e fa 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 b8 ff ff ff f7 d8 64 89 01 48
[   77.494300][ T8058] RSP: 002b:00007fff993d59f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
[   77.494971][ T8058] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fdd574dad9d
[   77.495631][ T8058] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
[   77.496221][ T8058] RBP: 00007fdd57533380 R08: 0000000000000000 R09: 0000000000000000
[   77.496798][ T8058] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff993d5a40
[   77.497409][ T8058] R13: 00007fff993d5a60 R14: 00007fdd57567300 R15: 00007fdd57533366
[   77.498041][ T8058]  </TASK>
[   77.504343][ T8058] ================================================================================
[   77.505104][ T8058] Kernel panic - not syncing: UBSAN: panic_on_warn set ...
[   77.505643][ T8058] CPU: 1 PID: 8058 Comm: syz-executor228 Not tainted 6.6.0-gd2f51b3516da #1
[   77.506306][ T8058] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
[   77.507003][ T8058] Call Trace:
[   77.507285][ T8058]  <TASK>
[   77.507510][ T8058]  dump_stack_lvl+0xd9/0x150
[   77.507896][ T8058]  panic+0x6b9/0x760
[   77.508213][ T8058]  ? panic_smp_self_stop+0xa0/0xa0
[   77.508633][ T8058]  ? kmsg_dump_get_line+0x330/0x330
[   77.509070][ T8058]  ? check_panic_on_warn+0x1f/0xc0
[   77.509501][ T8058]  check_panic_on_warn+0xb1/0xc0
[   77.509866][ T8058]  __ubsan_handle_out_of_bounds+0xfd/0x130
[   77.510342][ T8058]  ? kvm_sched_clock_read+0x16/0x20
[   77.510763][ T8058]  rds_cmsg_recv+0x60d/0x700
[   77.511150][ T8058]  ? rds_recvmsg_zcookie+0x490/0x490
[   77.511575][ T8058]  ? rds_recvmsg+0x695/0x1610
[   77.512017][ T8058]  ? lock_downgrade+0x6a0/0x6a0
[   77.512425][ T8058]  ? _raw_write_unlock_irqrestore+0x54/0x70
[   77.512914][ T8058]  rds_recvmsg+0x3fb/0x1610
[   77.513276][ T8058]  ? rds_notify_queue_get+0x760/0x760
[   77.513706][ T8058]  ? aa_af_perm+0x240/0x240
[   77.514081][ T8058]  ? prepare_to_swait_exclusive+0x240/0x240
[   77.514573][ T8058]  ? bpf_lsm_socket_recvmsg+0x9/0x10
[   77.515053][ T8058]  ? security_socket_recvmsg+0x93/0xc0
[   77.515518][ T8058]  ? rds_notify_queue_get+0x760/0x760
[   77.515977][ T8058]  sock_recvmsg+0xe2/0x160
[   77.516379][ T8058]  __sys_recvfrom+0x1b6/0x2f0
[   77.516775][ T8058]  ? __ia32_sys_send+0x100/0x100
[   77.517210][ T8058]  ? lock_downgrade+0x6a0/0x6a0
[   77.517641][ T8058]  ? __rseq_handle_notify_resume+0x5cf/0x1000
[   77.518178][ T8058]  ? __ia32_sys_socketpair+0x100/0x100
[   77.518655][ T8058]  ? __sys_connect+0x10e/0x1a0
[   77.519083][ T8058]  ? __do_sys_rseq+0x750/0x750
[   77.519497][ T8058]  ? folio_memcg_unlock+0x240/0x240
[   77.519908][ T8058]  __x64_sys_recvfrom+0xe0/0x1b0
[   77.520325][ T8058]  ? syscall_enter_from_user_mode+0x7f/0x120
[   77.520809][ T8058]  do_syscall_64+0x40/0x110
[   77.521178][ T8058]  entry_SYSCALL_64_after_hwframe+0x63/0x6b
[   77.521724][ T8058] RIP: 0033:0x7fdd574dad9d
[   77.522156][ T8058] Code: 28 c3 e8 e6 22 00 00 66 0f 1f 44 00 00 f3 0f 1e fa 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 b8 ff ff ff f7 d8 64 89 01 48
[   77.523535][ T8058] RSP: 002b:00007fff993d59f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
[   77.524134][ T8058] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fdd574dad9d
[   77.524683][ T8058] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
[   77.525239][ T8058] RBP: 00007fdd57533380 R08: 0000000000000000 R09: 0000000000000000
[   77.525799][ T8058] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff993d5a40
[   77.526362][ T8058] R13: 00007fff993d5a60 R14: 00007fdd57567300 R15: 00007fdd57533366
[   77.526984][ T8058]  </TASK>
[   77.527362][ T8058] Kernel Offset: disabled
[   77.527767][ T8058] Rebooting in 86400 seconds..

VM DIAGNOSIS:
19:50:56  Registers:
info registers vcpu 0
RAX=00000000000220e9 RBX=0000000000000000 RCX=ffffffff8a6223db RDX=0000000000000000
RSI=0000000000000001 RDI=0000000000000000 RBP=dffffc0000000000 RSP=ffffffff8ca07e08
R8 =0000000000000001 R9 =ffffed1005946dbd R10=ffff88802ca36deb R11=0000000000000000
R12=0000000000000000 R13=ffffffff8ef7d250 R14=0000000000000000 R15=0000000000000000
RIP=ffffffff8a623bfe RFL=00000202 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=1
ES =0000 0000000000000000 00000000 00000000
CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA]
SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0000 0000000000000000 00000000 00000000
FS =0000 0000000000000000 00000000 00000000
GS =0000 ffff88802ca00000 00000000 00000000
LDT=0000 fffffe5900000000 00000000 00000000
TR =0040 fffffe0000003000 00004087 00008b00 DPL=0 TSS64-busy
GDT=     fffffe0000001000 0000007f
IDT=     fffffe0000000000 00000fff
CR0=80050033 CR2=00007f906224d648 CR3=0000000017398000 CR4=00350ef0
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000d01
FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80
FPR0=0000000000000000 0000 FPR1=0000000000000000 0000
FPR2=0000000000000000 0000 FPR3=0000000000000000 0000
FPR4=0000000000000000 0000 FPR5=0000000000000000 0000
FPR6=0000000000000000 0000 FPR7=0000000000000000 0000
YMM00=0000000000000000 0000000000000000 512e60cee616e48b a7a17fa2a98833e0
YMM01=0000000000000000 0000000000000000 1bb8cee680be1f6e 7a6bb8571aee9717
YMM02=0000000000000000 0000000000000000 a6280bc585993577 c6e81887f0754763
YMM03=0000000000000000 0000000000000000 7eb7b8fd75791865 81a912d699d3c682
YMM04=0000000000000000 0000000000000000 0000000000000000 0000000000000000
YMM05=0000000000000000 0000000000000000 0000000000000000 0000000000000000
YMM06=0000000000000000 0000000000000000 0000000000000000 0000000000000000
YMM07=0000000000000000 0000000000000000 0000000000000000 0000000002eed311
YMM08=0000000000000000 0000000000000000 8a00000030000000 180000006c000000
YMM09=0000000000000000 0000000000000000 0000000000000000 0000000000000000
YMM10=0000000000000000 0000000000000000 a6964d585ee97e45 a80c335293b2e155
YMM11=0000000000000000 0000000000000000 ef65dbfbc5faeef7 e3da409fef92181f
YMM12=0000000000000000 0000000000000000 0d0c0f0e09080b0a 0504070601000302
YMM13=0000000000000000 0000000000000000 0c0f0e0d080b0a09 0407060500030201
YMM14=0000000000000000 0000000000000000 00000000ffffffff 0000000000000060
YMM15=0000000000000000 0000000000000000 0000000000000000 0000000000000020
info registers vcpu 1
RAX=dffffc0000000005 RBX=00000000000003f9 RCX=0000000000000000 RDX=00000000000003f9
RSI=ffffffff84c81d00 RDI=ffffffff9286ff60 RBP=ffffffff9286ff20 RSP=ffffc90003e67490
R8 =0000000000000001 R9 =000000000000001f R10=0000000000000000 R11=0000000000000000
R12=0000000000000000 R13=ffffffff9286ff20 R14=ffffffff928701e0 R15=ffffffff9286ff70
RIP=ffffffff84c81d27 RFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0000 0000000000000000 00000000 00000000
CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA]
SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0000 0000000000000000 00000000 00000000
FS =0000 0000555556eea3c0 00000000 00000000
GS =0000 ffff88807ec00000 00000000 00000000
LDT=0000 fffffe1d00000000 00000000 00000000
TR =0040 fffffe000004a000 00004087 00008b00 DPL=0 TSS64-busy
GDT=     fffffe0000048000 0000007f
IDT=     fffffe0000000000 00000fff
CR0=80050033 CR2=00000000200000c0 CR3=000000001d2f2000 CR4=00350ef0
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000d01
FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80
FPR0=0000000000000000 0000 FPR1=0000000000000000 0000
FPR2=0000000000000000 0000 FPR3=0000000000000000 0000
FPR4=0000000000000000 0000 FPR5=0000000000000000 0000
FPR6=0000000000000000 0000 FPR7=0000000000000000 0000
YMM00=0000000000000000 0000000000000000 249dd689f4b472fe d82d68dcbe16388a
YMM01=0000000000000000 0000000000000000 43b409cde8b7e134 26c925d3087d519f
YMM02=0000000000000000 0000000000000000 a47a2bb03ce18847 f002136ae62620c4
YMM03=0000000000000000 0000000000000000 4d00908ea79f2da6 073fdb521fd6c940
YMM04=0000000000000000 0000000000000000 0000000000000000 00000000ed27fd12
YMM05=0000000000000000 0000000000000000 0000000000000000 612d1be5cf3ea66a
YMM06=0000000000000000 0000000000000000 0000000000000000 00000000612d1be5
YMM07=0000000000000000 0000000000000000 612d1be5cf3ea66a ed27fd1217933eae
YMM08=0000000000000000 0000000000000000 5400000050000000 ba00000046000000
YMM09=0000000000000000 0000000000000000 0000000000000000 0000000000000000
YMM10=0000000000000000 0000000000000000 a54ff53a3c6ef372 bb67ae856b08e647
YMM11=0000000000000000 0000000000000000 5be0cd191f83d9ab 9b05688c510e527f
YMM12=0000000000000000 0000000000000000 0d0c0f0e09080b0a 0504070601000302
YMM13=0000000000000000 0000000000000000 0c0f0e0d080b0a09 0407060500030201
YMM14=0000000000000000 0000000000000000 00000000ffffffff 000000000000003c
YMM15=0000000000000000 0000000000000000 0000000000000000 000000000000003c

[-- Attachment #5: repro.cprog --]
[-- Type: application/octet-stream, Size: 34342 bytes --]

// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE 

#include <arpa/inet.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <netinet/in.h>
#include <sched.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <unistd.h>

#include <linux/capability.h>
#include <linux/genetlink.h>
#include <linux/if_addr.h>
#include <linux/if_ether.h>
#include <linux/if_link.h>
#include <linux/if_tun.h>
#include <linux/in6.h>
#include <linux/ip.h>
#include <linux/neighbour.h>
#include <linux/net.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/tcp.h>
#include <linux/veth.h>

static unsigned long long procid;

static bool write_file(const char* file, const char* what, ...)
{
	char buf[1024];
	va_list args;
	va_start(args, what);
	vsnprintf(buf, sizeof(buf), what, args);
	va_end(args);
	buf[sizeof(buf) - 1] = 0;
	int len = strlen(buf);
	int fd = open(file, O_WRONLY | O_CLOEXEC);
	if (fd == -1)
		return false;
	if (write(fd, buf, len) != len) {
		int err = errno;
		close(fd);
		errno = err;
		return false;
	}
	close(fd);
	return true;
}

struct nlmsg {
	char* pos;
	int nesting;
	struct nlattr* nested[8];
	char buf[4096];
};

static void netlink_init(struct nlmsg* nlmsg, int typ, int flags,
			 const void* data, int size)
{
	memset(nlmsg, 0, sizeof(*nlmsg));
	struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
	hdr->nlmsg_type = typ;
	hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags;
	memcpy(hdr + 1, data, size);
	nlmsg->pos = (char*)(hdr + 1) + NLMSG_ALIGN(size);
}

static void netlink_attr(struct nlmsg* nlmsg, int typ,
			 const void* data, int size)
{
	struct nlattr* attr = (struct nlattr*)nlmsg->pos;
	attr->nla_len = sizeof(*attr) + size;
	attr->nla_type = typ;
	if (size > 0)
		memcpy(attr + 1, data, size);
	nlmsg->pos += NLMSG_ALIGN(attr->nla_len);
}

static void netlink_nest(struct nlmsg* nlmsg, int typ)
{
	struct nlattr* attr = (struct nlattr*)nlmsg->pos;
	attr->nla_type = typ;
	nlmsg->pos += sizeof(*attr);
	nlmsg->nested[nlmsg->nesting++] = attr;
}

static void netlink_done(struct nlmsg* nlmsg)
{
	struct nlattr* attr = nlmsg->nested[--nlmsg->nesting];
	attr->nla_len = nlmsg->pos - (char*)attr;
}

static int netlink_send_ext(struct nlmsg* nlmsg, int sock,
			    uint16_t reply_type, int* reply_len, bool dofail)
{
	if (nlmsg->pos > nlmsg->buf + sizeof(nlmsg->buf) || nlmsg->nesting)
	exit(1);
	struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
	hdr->nlmsg_len = nlmsg->pos - nlmsg->buf;
	struct sockaddr_nl addr;
	memset(&addr, 0, sizeof(addr));
	addr.nl_family = AF_NETLINK;
	ssize_t n = sendto(sock, nlmsg->buf, hdr->nlmsg_len, 0, (struct sockaddr*)&addr, sizeof(addr));
	if (n != (ssize_t)hdr->nlmsg_len) {
		if (dofail)
	exit(1);
		return -1;
	}
	n = recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
	if (reply_len)
		*reply_len = 0;
	if (n < 0) {
		if (dofail)
	exit(1);
		return -1;
	}
	if (n < (ssize_t)sizeof(struct nlmsghdr)) {
		errno = EINVAL;
		if (dofail)
	exit(1);
		return -1;
	}
	if (hdr->nlmsg_type == NLMSG_DONE)
		return 0;
	if (reply_len && hdr->nlmsg_type == reply_type) {
		*reply_len = n;
		return 0;
	}
	if (n < (ssize_t)(sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr))) {
		errno = EINVAL;
		if (dofail)
	exit(1);
		return -1;
	}
	if (hdr->nlmsg_type != NLMSG_ERROR) {
		errno = EINVAL;
		if (dofail)
	exit(1);
		return -1;
	}
	errno = -((struct nlmsgerr*)(hdr + 1))->error;
	return -errno;
}

static int netlink_send(struct nlmsg* nlmsg, int sock)
{
	return netlink_send_ext(nlmsg, sock, 0, NULL, true);
}

static int netlink_query_family_id(struct nlmsg* nlmsg, int sock, const char* family_name, bool dofail)
{
	struct genlmsghdr genlhdr;
	memset(&genlhdr, 0, sizeof(genlhdr));
	genlhdr.cmd = CTRL_CMD_GETFAMILY;
	netlink_init(nlmsg, GENL_ID_CTRL, 0, &genlhdr, sizeof(genlhdr));
	netlink_attr(nlmsg, CTRL_ATTR_FAMILY_NAME, family_name, strnlen(family_name, GENL_NAMSIZ - 1) + 1);
	int n = 0;
	int err = netlink_send_ext(nlmsg, sock, GENL_ID_CTRL, &n, dofail);
	if (err < 0) {
		return -1;
	}
	uint16_t id = 0;
	struct nlattr* attr = (struct nlattr*)(nlmsg->buf + NLMSG_HDRLEN + NLMSG_ALIGN(sizeof(genlhdr)));
	for (; (char*)attr < nlmsg->buf + n; attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
		if (attr->nla_type == CTRL_ATTR_FAMILY_ID) {
			id = *(uint16_t*)(attr + 1);
			break;
		}
	}
	if (!id) {
		errno = EINVAL;
		return -1;
	}
	recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
	return id;
}

static int netlink_next_msg(struct nlmsg* nlmsg, unsigned int offset,
			    unsigned int total_len)
{
	struct nlmsghdr* hdr = (struct nlmsghdr*)(nlmsg->buf + offset);
	if (offset == total_len || offset + hdr->nlmsg_len > total_len)
		return -1;
	return hdr->nlmsg_len;
}

static void netlink_add_device_impl(struct nlmsg* nlmsg, const char* type,
				    const char* name, bool up)
{
	struct ifinfomsg hdr;
	memset(&hdr, 0, sizeof(hdr));
	if (up)
		hdr.ifi_flags = hdr.ifi_change = IFF_UP;
	netlink_init(nlmsg, RTM_NEWLINK, NLM_F_EXCL | NLM_F_CREATE, &hdr, sizeof(hdr));
	if (name)
		netlink_attr(nlmsg, IFLA_IFNAME, name, strlen(name));
	netlink_nest(nlmsg, IFLA_LINKINFO);
	netlink_attr(nlmsg, IFLA_INFO_KIND, type, strlen(type));
}

static void netlink_add_device(struct nlmsg* nlmsg, int sock, const char* type,
			       const char* name)
{
	netlink_add_device_impl(nlmsg, type, name, false);
	netlink_done(nlmsg);
	int err = netlink_send(nlmsg, sock);
	if (err < 0) {
	}
}

static void netlink_add_veth(struct nlmsg* nlmsg, int sock, const char* name,
			     const char* peer)
{
	netlink_add_device_impl(nlmsg, "veth", name, false);
	netlink_nest(nlmsg, IFLA_INFO_DATA);
	netlink_nest(nlmsg, VETH_INFO_PEER);
	nlmsg->pos += sizeof(struct ifinfomsg);
	netlink_attr(nlmsg, IFLA_IFNAME, peer, strlen(peer));
	netlink_done(nlmsg);
	netlink_done(nlmsg);
	netlink_done(nlmsg);
	int err = netlink_send(nlmsg, sock);
	if (err < 0) {
	}
}

static void netlink_add_xfrm(struct nlmsg* nlmsg, int sock, const char* name)
{
	netlink_add_device_impl(nlmsg, "xfrm", name, true);
	netlink_nest(nlmsg, IFLA_INFO_DATA);
	int if_id = 1;
	netlink_attr(nlmsg, 2, &if_id, sizeof(if_id));
	netlink_done(nlmsg);
	netlink_done(nlmsg);
	int err = netlink_send(nlmsg, sock);
	if (err < 0) {
	}
}

static void netlink_add_hsr(struct nlmsg* nlmsg, int sock, const char* name,
			    const char* slave1, const char* slave2)
{
	netlink_add_device_impl(nlmsg, "hsr", name, false);
	netlink_nest(nlmsg, IFLA_INFO_DATA);
	int ifindex1 = if_nametoindex(slave1);
	netlink_attr(nlmsg, IFLA_HSR_SLAVE1, &ifindex1, sizeof(ifindex1));
	int ifindex2 = if_nametoindex(slave2);
	netlink_attr(nlmsg, IFLA_HSR_SLAVE2, &ifindex2, sizeof(ifindex2));
	netlink_done(nlmsg);
	netlink_done(nlmsg);
	int err = netlink_send(nlmsg, sock);
	if (err < 0) {
	}
}

static void netlink_add_linked(struct nlmsg* nlmsg, int sock, const char* type, const char* name, const char* link)
{
	netlink_add_device_impl(nlmsg, type, name, false);
	netlink_done(nlmsg);
	int ifindex = if_nametoindex(link);
	netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
	int err = netlink_send(nlmsg, sock);
	if (err < 0) {
	}
}

static void netlink_add_vlan(struct nlmsg* nlmsg, int sock, const char* name, const char* link, uint16_t id, uint16_t proto)
{
	netlink_add_device_impl(nlmsg, "vlan", name, false);
	netlink_nest(nlmsg, IFLA_INFO_DATA);
	netlink_attr(nlmsg, IFLA_VLAN_ID, &id, sizeof(id));
	netlink_attr(nlmsg, IFLA_VLAN_PROTOCOL, &proto, sizeof(proto));
	netlink_done(nlmsg);
	netlink_done(nlmsg);
	int ifindex = if_nametoindex(link);
	netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
	int err = netlink_send(nlmsg, sock);
	if (err < 0) {
	}
}

static void netlink_add_macvlan(struct nlmsg* nlmsg, int sock, const char* name, const char* link)
{
	netlink_add_device_impl(nlmsg, "macvlan", name, false);
	netlink_nest(nlmsg, IFLA_INFO_DATA);
	uint32_t mode = MACVLAN_MODE_BRIDGE;
	netlink_attr(nlmsg, IFLA_MACVLAN_MODE, &mode, sizeof(mode));
	netlink_done(nlmsg);
	netlink_done(nlmsg);
	int ifindex = if_nametoindex(link);
	netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
	int err = netlink_send(nlmsg, sock);
	if (err < 0) {
	}
}

static void netlink_add_geneve(struct nlmsg* nlmsg, int sock, const char* name, uint32_t vni, struct in_addr* addr4, struct in6_addr* addr6)
{
	netlink_add_device_impl(nlmsg, "geneve", name, false);
	netlink_nest(nlmsg, IFLA_INFO_DATA);
	netlink_attr(nlmsg, IFLA_GENEVE_ID, &vni, sizeof(vni));
	if (addr4)
		netlink_attr(nlmsg, IFLA_GENEVE_REMOTE, addr4, sizeof(*addr4));
	if (addr6)
		netlink_attr(nlmsg, IFLA_GENEVE_REMOTE6, addr6, sizeof(*addr6));
	netlink_done(nlmsg);
	netlink_done(nlmsg);
	int err = netlink_send(nlmsg, sock);
	if (err < 0) {
	}
}

#define IFLA_IPVLAN_FLAGS 2
#define IPVLAN_MODE_L3S 2
#undef IPVLAN_F_VEPA
#define IPVLAN_F_VEPA 2

static void netlink_add_ipvlan(struct nlmsg* nlmsg, int sock, const char* name, const char* link, uint16_t mode, uint16_t flags)
{
	netlink_add_device_impl(nlmsg, "ipvlan", name, false);
	netlink_nest(nlmsg, IFLA_INFO_DATA);
	netlink_attr(nlmsg, IFLA_IPVLAN_MODE, &mode, sizeof(mode));
	netlink_attr(nlmsg, IFLA_IPVLAN_FLAGS, &flags, sizeof(flags));
	netlink_done(nlmsg);
	netlink_done(nlmsg);
	int ifindex = if_nametoindex(link);
	netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
	int err = netlink_send(nlmsg, sock);
	if (err < 0) {
	}
}

static void netlink_device_change(struct nlmsg* nlmsg, int sock, const char* name, bool up,
				  const char* master, const void* mac, int macsize,
				  const char* new_name)
{
	struct ifinfomsg hdr;
	memset(&hdr, 0, sizeof(hdr));
	if (up)
		hdr.ifi_flags = hdr.ifi_change = IFF_UP;
	hdr.ifi_index = if_nametoindex(name);
	netlink_init(nlmsg, RTM_NEWLINK, 0, &hdr, sizeof(hdr));
	if (new_name)
		netlink_attr(nlmsg, IFLA_IFNAME, new_name, strlen(new_name));
	if (master) {
		int ifindex = if_nametoindex(master);
		netlink_attr(nlmsg, IFLA_MASTER, &ifindex, sizeof(ifindex));
	}
	if (macsize)
		netlink_attr(nlmsg, IFLA_ADDRESS, mac, macsize);
	int err = netlink_send(nlmsg, sock);
	if (err < 0) {
	}
}

static int netlink_add_addr(struct nlmsg* nlmsg, int sock, const char* dev,
			    const void* addr, int addrsize)
{
	struct ifaddrmsg hdr;
	memset(&hdr, 0, sizeof(hdr));
	hdr.ifa_family = addrsize == 4 ? AF_INET : AF_INET6;
	hdr.ifa_prefixlen = addrsize == 4 ? 24 : 120;
	hdr.ifa_scope = RT_SCOPE_UNIVERSE;
	hdr.ifa_index = if_nametoindex(dev);
	netlink_init(nlmsg, RTM_NEWADDR, NLM_F_CREATE | NLM_F_REPLACE, &hdr, sizeof(hdr));
	netlink_attr(nlmsg, IFA_LOCAL, addr, addrsize);
	netlink_attr(nlmsg, IFA_ADDRESS, addr, addrsize);
	return netlink_send(nlmsg, sock);
}

static void netlink_add_addr4(struct nlmsg* nlmsg, int sock,
			      const char* dev, const char* addr)
{
	struct in_addr in_addr;
	inet_pton(AF_INET, addr, &in_addr);
	int err = netlink_add_addr(nlmsg, sock, dev, &in_addr, sizeof(in_addr));
	if (err < 0) {
	}
}

static void netlink_add_addr6(struct nlmsg* nlmsg, int sock,
			      const char* dev, const char* addr)
{
	struct in6_addr in6_addr;
	inet_pton(AF_INET6, addr, &in6_addr);
	int err = netlink_add_addr(nlmsg, sock, dev, &in6_addr, sizeof(in6_addr));
	if (err < 0) {
	}
}

static struct nlmsg nlmsg;

#define DEVLINK_FAMILY_NAME "devlink"

#define DEVLINK_CMD_PORT_GET 5
#define DEVLINK_ATTR_BUS_NAME 1
#define DEVLINK_ATTR_DEV_NAME 2
#define DEVLINK_ATTR_NETDEV_NAME 7

static struct nlmsg nlmsg2;

static void initialize_devlink_ports(const char* bus_name, const char* dev_name,
				     const char* netdev_prefix)
{
	struct genlmsghdr genlhdr;
	int len, total_len, id, err, offset;
	uint16_t netdev_index;
	int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
	if (sock == -1)
	exit(1);
	int rtsock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
	if (rtsock == -1)
	exit(1);
	id = netlink_query_family_id(&nlmsg, sock, DEVLINK_FAMILY_NAME, true);
	if (id == -1)
		goto error;
	memset(&genlhdr, 0, sizeof(genlhdr));
	genlhdr.cmd = DEVLINK_CMD_PORT_GET;
	netlink_init(&nlmsg, id, NLM_F_DUMP, &genlhdr, sizeof(genlhdr));
	netlink_attr(&nlmsg, DEVLINK_ATTR_BUS_NAME, bus_name, strlen(bus_name) + 1);
	netlink_attr(&nlmsg, DEVLINK_ATTR_DEV_NAME, dev_name, strlen(dev_name) + 1);
	err = netlink_send_ext(&nlmsg, sock, id, &total_len, true);
	if (err < 0) {
		goto error;
	}
	offset = 0;
	netdev_index = 0;
	while ((len = netlink_next_msg(&nlmsg, offset, total_len)) != -1) {
		struct nlattr* attr = (struct nlattr*)(nlmsg.buf + offset + NLMSG_HDRLEN + NLMSG_ALIGN(sizeof(genlhdr)));
		for (; (char*)attr < nlmsg.buf + offset + len; attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
			if (attr->nla_type == DEVLINK_ATTR_NETDEV_NAME) {
				char* port_name;
				char netdev_name[IFNAMSIZ];
				port_name = (char*)(attr + 1);
				snprintf(netdev_name, sizeof(netdev_name), "%s%d", netdev_prefix, netdev_index);
				netlink_device_change(&nlmsg2, rtsock, port_name, true, 0, 0, 0, netdev_name);
				break;
			}
		}
		offset += len;
		netdev_index++;
	}
error:
	close(rtsock);
	close(sock);
}

#define DEV_IPV4 "172.20.20.%d"
#define DEV_IPV6 "fe80::%02x"
#define DEV_MAC 0x00aaaaaaaaaa

static void netdevsim_add(unsigned int addr, unsigned int port_count)
{
	write_file("/sys/bus/netdevsim/del_device", "%u", addr);
	if (write_file("/sys/bus/netdevsim/new_device", "%u %u", addr, port_count)) {
		char buf[32];
		snprintf(buf, sizeof(buf), "netdevsim%d", addr);
		initialize_devlink_ports("netdevsim", buf, "netdevsim");
	}
}

#define WG_GENL_NAME "wireguard"
enum wg_cmd {
	WG_CMD_GET_DEVICE,
	WG_CMD_SET_DEVICE,
};
enum wgdevice_attribute {
	WGDEVICE_A_UNSPEC,
	WGDEVICE_A_IFINDEX,
	WGDEVICE_A_IFNAME,
	WGDEVICE_A_PRIVATE_KEY,
	WGDEVICE_A_PUBLIC_KEY,
	WGDEVICE_A_FLAGS,
	WGDEVICE_A_LISTEN_PORT,
	WGDEVICE_A_FWMARK,
	WGDEVICE_A_PEERS,
};
enum wgpeer_attribute {
	WGPEER_A_UNSPEC,
	WGPEER_A_PUBLIC_KEY,
	WGPEER_A_PRESHARED_KEY,
	WGPEER_A_FLAGS,
	WGPEER_A_ENDPOINT,
	WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL,
	WGPEER_A_LAST_HANDSHAKE_TIME,
	WGPEER_A_RX_BYTES,
	WGPEER_A_TX_BYTES,
	WGPEER_A_ALLOWEDIPS,
	WGPEER_A_PROTOCOL_VERSION,
};
enum wgallowedip_attribute {
	WGALLOWEDIP_A_UNSPEC,
	WGALLOWEDIP_A_FAMILY,
	WGALLOWEDIP_A_IPADDR,
	WGALLOWEDIP_A_CIDR_MASK,
};

static void netlink_wireguard_setup(void)
{
	const char ifname_a[] = "wg0";
	const char ifname_b[] = "wg1";
	const char ifname_c[] = "wg2";
	const char private_a[] = "\xa0\x5c\xa8\x4f\x6c\x9c\x8e\x38\x53\xe2\xfd\x7a\x70\xae\x0f\xb2\x0f\xa1\x52\x60\x0c\xb0\x08\x45\x17\x4f\x08\x07\x6f\x8d\x78\x43";
	const char private_b[] = "\xb0\x80\x73\xe8\xd4\x4e\x91\xe3\xda\x92\x2c\x22\x43\x82\x44\xbb\x88\x5c\x69\xe2\x69\xc8\xe9\xd8\x35\xb1\x14\x29\x3a\x4d\xdc\x6e";
	const char private_c[] = "\xa0\xcb\x87\x9a\x47\xf5\xbc\x64\x4c\x0e\x69\x3f\xa6\xd0\x31\xc7\x4a\x15\x53\xb6\xe9\x01\xb9\xff\x2f\x51\x8c\x78\x04\x2f\xb5\x42";
	const char public_a[] = "\x97\x5c\x9d\x81\xc9\x83\xc8\x20\x9e\xe7\x81\x25\x4b\x89\x9f\x8e\xd9\x25\xae\x9f\x09\x23\xc2\x3c\x62\xf5\x3c\x57\xcd\xbf\x69\x1c";
	const char public_b[] = "\xd1\x73\x28\x99\xf6\x11\xcd\x89\x94\x03\x4d\x7f\x41\x3d\xc9\x57\x63\x0e\x54\x93\xc2\x85\xac\xa4\x00\x65\xcb\x63\x11\xbe\x69\x6b";
	const char public_c[] = "\xf4\x4d\xa3\x67\xa8\x8e\xe6\x56\x4f\x02\x02\x11\x45\x67\x27\x08\x2f\x5c\xeb\xee\x8b\x1b\xf5\xeb\x73\x37\x34\x1b\x45\x9b\x39\x22";
	const uint16_t listen_a = 20001;
	const uint16_t listen_b = 20002;
	const uint16_t listen_c = 20003;
	const uint16_t af_inet = AF_INET;
	const uint16_t af_inet6 = AF_INET6;
	const struct sockaddr_in endpoint_b_v4 = {
	    .sin_family = AF_INET,
	    .sin_port = htons(listen_b),
	    .sin_addr = {htonl(INADDR_LOOPBACK)}};
	const struct sockaddr_in endpoint_c_v4 = {
	    .sin_family = AF_INET,
	    .sin_port = htons(listen_c),
	    .sin_addr = {htonl(INADDR_LOOPBACK)}};
	struct sockaddr_in6 endpoint_a_v6 = {
	    .sin6_family = AF_INET6,
	    .sin6_port = htons(listen_a)};
	endpoint_a_v6.sin6_addr = in6addr_loopback;
	struct sockaddr_in6 endpoint_c_v6 = {
	    .sin6_family = AF_INET6,
	    .sin6_port = htons(listen_c)};
	endpoint_c_v6.sin6_addr = in6addr_loopback;
	const struct in_addr first_half_v4 = {0};
	const struct in_addr second_half_v4 = {(uint32_t)htonl(128 << 24)};
	const struct in6_addr first_half_v6 = {{{0}}};
	const struct in6_addr second_half_v6 = {{{0x80}}};
	const uint8_t half_cidr = 1;
	const uint16_t persistent_keepalives[] = {1, 3, 7, 9, 14, 19};
	struct genlmsghdr genlhdr = {
	    .cmd = WG_CMD_SET_DEVICE,
	    .version = 1};
	int sock;
	int id, err;
	sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
	if (sock == -1) {
		return;
	}
	id = netlink_query_family_id(&nlmsg, sock, WG_GENL_NAME, true);
	if (id == -1)
		goto error;
	netlink_init(&nlmsg, id, 0, &genlhdr, sizeof(genlhdr));
	netlink_attr(&nlmsg, WGDEVICE_A_IFNAME, ifname_a, strlen(ifname_a) + 1);
	netlink_attr(&nlmsg, WGDEVICE_A_PRIVATE_KEY, private_a, 32);
	netlink_attr(&nlmsg, WGDEVICE_A_LISTEN_PORT, &listen_a, 2);
	netlink_nest(&nlmsg, NLA_F_NESTED | WGDEVICE_A_PEERS);
	netlink_nest(&nlmsg, NLA_F_NESTED | 0);
	netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_b, 32);
	netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_b_v4, sizeof(endpoint_b_v4));
	netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, &persistent_keepalives[0], 2);
	netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS);
	netlink_nest(&nlmsg, NLA_F_NESTED | 0);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v4, sizeof(first_half_v4));
	netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
	netlink_done(&nlmsg);
	netlink_nest(&nlmsg, NLA_F_NESTED | 0);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v6, sizeof(first_half_v6));
	netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
	netlink_done(&nlmsg);
	netlink_done(&nlmsg);
	netlink_done(&nlmsg);
	netlink_nest(&nlmsg, NLA_F_NESTED | 0);
	netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_c, 32);
	netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_c_v6, sizeof(endpoint_c_v6));
	netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, &persistent_keepalives[1], 2);
	netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS);
	netlink_nest(&nlmsg, NLA_F_NESTED | 0);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v4, sizeof(second_half_v4));
	netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
	netlink_done(&nlmsg);
	netlink_nest(&nlmsg, NLA_F_NESTED | 0);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v6, sizeof(second_half_v6));
	netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
	netlink_done(&nlmsg);
	netlink_done(&nlmsg);
	netlink_done(&nlmsg);
	netlink_done(&nlmsg);
	err = netlink_send(&nlmsg, sock);
	if (err < 0) {
	}
	netlink_init(&nlmsg, id, 0, &genlhdr, sizeof(genlhdr));
	netlink_attr(&nlmsg, WGDEVICE_A_IFNAME, ifname_b, strlen(ifname_b) + 1);
	netlink_attr(&nlmsg, WGDEVICE_A_PRIVATE_KEY, private_b, 32);
	netlink_attr(&nlmsg, WGDEVICE_A_LISTEN_PORT, &listen_b, 2);
	netlink_nest(&nlmsg, NLA_F_NESTED | WGDEVICE_A_PEERS);
	netlink_nest(&nlmsg, NLA_F_NESTED | 0);
	netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_a, 32);
	netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_a_v6, sizeof(endpoint_a_v6));
	netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, &persistent_keepalives[2], 2);
	netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS);
	netlink_nest(&nlmsg, NLA_F_NESTED | 0);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v4, sizeof(first_half_v4));
	netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
	netlink_done(&nlmsg);
	netlink_nest(&nlmsg, NLA_F_NESTED | 0);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v6, sizeof(first_half_v6));
	netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
	netlink_done(&nlmsg);
	netlink_done(&nlmsg);
	netlink_done(&nlmsg);
	netlink_nest(&nlmsg, NLA_F_NESTED | 0);
	netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_c, 32);
	netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_c_v4, sizeof(endpoint_c_v4));
	netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, &persistent_keepalives[3], 2);
	netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS);
	netlink_nest(&nlmsg, NLA_F_NESTED | 0);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v4, sizeof(second_half_v4));
	netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
	netlink_done(&nlmsg);
	netlink_nest(&nlmsg, NLA_F_NESTED | 0);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v6, sizeof(second_half_v6));
	netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
	netlink_done(&nlmsg);
	netlink_done(&nlmsg);
	netlink_done(&nlmsg);
	netlink_done(&nlmsg);
	err = netlink_send(&nlmsg, sock);
	if (err < 0) {
	}
	netlink_init(&nlmsg, id, 0, &genlhdr, sizeof(genlhdr));
	netlink_attr(&nlmsg, WGDEVICE_A_IFNAME, ifname_c, strlen(ifname_c) + 1);
	netlink_attr(&nlmsg, WGDEVICE_A_PRIVATE_KEY, private_c, 32);
	netlink_attr(&nlmsg, WGDEVICE_A_LISTEN_PORT, &listen_c, 2);
	netlink_nest(&nlmsg, NLA_F_NESTED | WGDEVICE_A_PEERS);
	netlink_nest(&nlmsg, NLA_F_NESTED | 0);
	netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_a, 32);
	netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_a_v6, sizeof(endpoint_a_v6));
	netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, &persistent_keepalives[4], 2);
	netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS);
	netlink_nest(&nlmsg, NLA_F_NESTED | 0);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v4, sizeof(first_half_v4));
	netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
	netlink_done(&nlmsg);
	netlink_nest(&nlmsg, NLA_F_NESTED | 0);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v6, sizeof(first_half_v6));
	netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
	netlink_done(&nlmsg);
	netlink_done(&nlmsg);
	netlink_done(&nlmsg);
	netlink_nest(&nlmsg, NLA_F_NESTED | 0);
	netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_b, 32);
	netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_b_v4, sizeof(endpoint_b_v4));
	netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, &persistent_keepalives[5], 2);
	netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS);
	netlink_nest(&nlmsg, NLA_F_NESTED | 0);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v4, sizeof(second_half_v4));
	netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
	netlink_done(&nlmsg);
	netlink_nest(&nlmsg, NLA_F_NESTED | 0);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2);
	netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v6, sizeof(second_half_v6));
	netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1);
	netlink_done(&nlmsg);
	netlink_done(&nlmsg);
	netlink_done(&nlmsg);
	netlink_done(&nlmsg);
	err = netlink_send(&nlmsg, sock);
	if (err < 0) {
	}

error:
	close(sock);
}

static void initialize_netdevices(void)
{
	char netdevsim[16];
	sprintf(netdevsim, "netdevsim%d", (int)procid);
	struct {
		const char* type;
		const char* dev;
	} devtypes[] = {
		{"ip6gretap", "ip6gretap0"},
		{"bridge", "bridge0"},
		{"vcan", "vcan0"},
		{"bond", "bond0"},
		{"team", "team0"},
		{"dummy", "dummy0"},
		{"nlmon", "nlmon0"},
		{"caif", "caif0"},
		{"batadv", "batadv0"},
		{"vxcan", "vxcan1"},
		{"veth", 0},
		{"wireguard", "wg0"},
		{"wireguard", "wg1"},
		{"wireguard", "wg2"},
	};
	const char* devmasters[] = {"bridge", "bond", "team", "batadv"};
	struct {
		const char* name;
		int macsize;
		bool noipv6;
	} devices[] = {
		{"lo", ETH_ALEN},
		{"sit0", 0},
		{"bridge0", ETH_ALEN},
		{"vcan0", 0, true},
		{"tunl0", 0},
		{"gre0", 0},
		{"gretap0", ETH_ALEN},
		{"ip_vti0", 0},
		{"ip6_vti0", 0},
		{"ip6tnl0", 0},
		{"ip6gre0", 0},
		{"ip6gretap0", ETH_ALEN},
		{"erspan0", ETH_ALEN},
		{"bond0", ETH_ALEN},
		{"veth0", ETH_ALEN},
		{"veth1", ETH_ALEN},
		{"team0", ETH_ALEN},
		{"veth0_to_bridge", ETH_ALEN},
		{"veth1_to_bridge", ETH_ALEN},
		{"veth0_to_bond", ETH_ALEN},
		{"veth1_to_bond", ETH_ALEN},
		{"veth0_to_team", ETH_ALEN},
		{"veth1_to_team", ETH_ALEN},
		{"veth0_to_hsr", ETH_ALEN},
		{"veth1_to_hsr", ETH_ALEN},
		{"hsr0", 0},
		{"dummy0", ETH_ALEN},
		{"nlmon0", 0},
		{"vxcan0", 0, true},
		{"vxcan1", 0, true},
		{"caif0", ETH_ALEN},
		{"batadv0", ETH_ALEN},
		{netdevsim, ETH_ALEN},
		{"xfrm0", ETH_ALEN},
		{"veth0_virt_wifi", ETH_ALEN},
		{"veth1_virt_wifi", ETH_ALEN},
		{"virt_wifi0", ETH_ALEN},
		{"veth0_vlan", ETH_ALEN},
		{"veth1_vlan", ETH_ALEN},
		{"vlan0", ETH_ALEN},
		{"vlan1", ETH_ALEN},
		{"macvlan0", ETH_ALEN},
		{"macvlan1", ETH_ALEN},
		{"ipvlan0", ETH_ALEN},
		{"ipvlan1", ETH_ALEN},
		{"veth0_macvtap", ETH_ALEN},
		{"veth1_macvtap", ETH_ALEN},
		{"macvtap0", ETH_ALEN},
		{"macsec0", ETH_ALEN},
		{"veth0_to_batadv", ETH_ALEN},
		{"veth1_to_batadv", ETH_ALEN},
		{"batadv_slave_0", ETH_ALEN},
		{"batadv_slave_1", ETH_ALEN},
		{"geneve0", ETH_ALEN},
		{"geneve1", ETH_ALEN},
		{"wg0", 0},
		{"wg1", 0},
		{"wg2", 0},
	};
	int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
	if (sock == -1)
	exit(1);
	unsigned i;
	for (i = 0; i < sizeof(devtypes) / sizeof(devtypes[0]); i++)
		netlink_add_device(&nlmsg, sock, devtypes[i].type, devtypes[i].dev);
	for (i = 0; i < sizeof(devmasters) / (sizeof(devmasters[0])); i++) {
		char master[32], slave0[32], veth0[32], slave1[32], veth1[32];
		sprintf(slave0, "%s_slave_0", devmasters[i]);
		sprintf(veth0, "veth0_to_%s", devmasters[i]);
		netlink_add_veth(&nlmsg, sock, slave0, veth0);
		sprintf(slave1, "%s_slave_1", devmasters[i]);
		sprintf(veth1, "veth1_to_%s", devmasters[i]);
		netlink_add_veth(&nlmsg, sock, slave1, veth1);
		sprintf(master, "%s0", devmasters[i]);
		netlink_device_change(&nlmsg, sock, slave0, false, master, 0, 0, NULL);
		netlink_device_change(&nlmsg, sock, slave1, false, master, 0, 0, NULL);
	}
	netlink_add_xfrm(&nlmsg, sock, "xfrm0");
	netlink_device_change(&nlmsg, sock, "bridge_slave_0", true, 0, 0, 0, NULL);
	netlink_device_change(&nlmsg, sock, "bridge_slave_1", true, 0, 0, 0, NULL);
	netlink_add_veth(&nlmsg, sock, "hsr_slave_0", "veth0_to_hsr");
	netlink_add_veth(&nlmsg, sock, "hsr_slave_1", "veth1_to_hsr");
	netlink_add_hsr(&nlmsg, sock, "hsr0", "hsr_slave_0", "hsr_slave_1");
	netlink_device_change(&nlmsg, sock, "hsr_slave_0", true, 0, 0, 0, NULL);
	netlink_device_change(&nlmsg, sock, "hsr_slave_1", true, 0, 0, 0, NULL);
	netlink_add_veth(&nlmsg, sock, "veth0_virt_wifi", "veth1_virt_wifi");
	netlink_add_linked(&nlmsg, sock, "virt_wifi", "virt_wifi0", "veth1_virt_wifi");
	netlink_add_veth(&nlmsg, sock, "veth0_vlan", "veth1_vlan");
	netlink_add_vlan(&nlmsg, sock, "vlan0", "veth0_vlan", 0, htons(ETH_P_8021Q));
	netlink_add_vlan(&nlmsg, sock, "vlan1", "veth0_vlan", 1, htons(ETH_P_8021AD));
	netlink_add_macvlan(&nlmsg, sock, "macvlan0", "veth1_vlan");
	netlink_add_macvlan(&nlmsg, sock, "macvlan1", "veth1_vlan");
	netlink_add_ipvlan(&nlmsg, sock, "ipvlan0", "veth0_vlan", IPVLAN_MODE_L2, 0);
	netlink_add_ipvlan(&nlmsg, sock, "ipvlan1", "veth0_vlan", IPVLAN_MODE_L3S, IPVLAN_F_VEPA);
	netlink_add_veth(&nlmsg, sock, "veth0_macvtap", "veth1_macvtap");
	netlink_add_linked(&nlmsg, sock, "macvtap", "macvtap0", "veth0_macvtap");
	netlink_add_linked(&nlmsg, sock, "macsec", "macsec0", "veth1_macvtap");
	char addr[32];
	sprintf(addr, DEV_IPV4, 14 + 10);
	struct in_addr geneve_addr4;
	if (inet_pton(AF_INET, addr, &geneve_addr4) <= 0)
	exit(1);
	struct in6_addr geneve_addr6;
	if (inet_pton(AF_INET6, "fc00::01", &geneve_addr6) <= 0)
	exit(1);
	netlink_add_geneve(&nlmsg, sock, "geneve0", 0, &geneve_addr4, 0);
	netlink_add_geneve(&nlmsg, sock, "geneve1", 1, 0, &geneve_addr6);
	netdevsim_add((int)procid, 4);
	netlink_wireguard_setup();
	for (i = 0; i < sizeof(devices) / (sizeof(devices[0])); i++) {
		char addr[32];
		sprintf(addr, DEV_IPV4, i + 10);
		netlink_add_addr4(&nlmsg, sock, devices[i].name, addr);
		if (!devices[i].noipv6) {
			sprintf(addr, DEV_IPV6, i + 10);
			netlink_add_addr6(&nlmsg, sock, devices[i].name, addr);
		}
		uint64_t macaddr = DEV_MAC + ((i + 10ull) << 40);
		netlink_device_change(&nlmsg, sock, devices[i].name, true, 0, &macaddr, devices[i].macsize, NULL);
	}
	close(sock);
}
static void initialize_netdevices_init(void)
{
	int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
	if (sock == -1)
	exit(1);
	struct {
		const char* type;
		int macsize;
		bool noipv6;
		bool noup;
	} devtypes[] = {
	    {"nr", 7, true},
	    {"rose", 5, true, true},
	};
	unsigned i;
	for (i = 0; i < sizeof(devtypes) / sizeof(devtypes[0]); i++) {
		char dev[32], addr[32];
		sprintf(dev, "%s%d", devtypes[i].type, (int)procid);
		sprintf(addr, "172.30.%d.%d", i, (int)procid + 1);
		netlink_add_addr4(&nlmsg, sock, dev, addr);
		if (!devtypes[i].noipv6) {
			sprintf(addr, "fe88::%02x:%02x", i, (int)procid + 1);
			netlink_add_addr6(&nlmsg, sock, dev, addr);
		}
		int macsize = devtypes[i].macsize;
		uint64_t macaddr = 0xbbbbbb + ((unsigned long long)i << (8 * (macsize - 2))) +
				 (procid << (8 * (macsize - 1)));
		netlink_device_change(&nlmsg, sock, dev, !devtypes[i].noup, 0, &macaddr, macsize, NULL);
	}
	close(sock);

}

static void setup_common()
{
	if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
	}
}

static void setup_binderfs()
{
	if (mkdir("/dev/binderfs", 0777)) {
	}
	if (mount("binder", "/dev/binderfs", "binder", 0, NULL)) {
	}
	if (symlink("/dev/binderfs", "./binderfs")) {
	}
}

static void loop();

static void sandbox_common()
{
	prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
	setsid();
	struct rlimit rlim;
	rlim.rlim_cur = rlim.rlim_max = (200 << 20);
	setrlimit(RLIMIT_AS, &rlim);
	rlim.rlim_cur = rlim.rlim_max = 32 << 20;
	setrlimit(RLIMIT_MEMLOCK, &rlim);
	rlim.rlim_cur = rlim.rlim_max = 136 << 20;
	setrlimit(RLIMIT_FSIZE, &rlim);
	rlim.rlim_cur = rlim.rlim_max = 1 << 20;
	setrlimit(RLIMIT_STACK, &rlim);
	rlim.rlim_cur = rlim.rlim_max = 128 << 20;
	setrlimit(RLIMIT_CORE, &rlim);
	rlim.rlim_cur = rlim.rlim_max = 256;
	setrlimit(RLIMIT_NOFILE, &rlim);
	if (unshare(CLONE_NEWNS)) {
	}
	if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) {
	}
	if (unshare(CLONE_NEWIPC)) {
	}
	if (unshare(0x02000000)) {
	}
	if (unshare(CLONE_NEWUTS)) {
	}
	if (unshare(CLONE_SYSVSEM)) {
	}
	typedef struct {
		const char* name;
		const char* value;
	} sysctl_t;
	static const sysctl_t sysctls[] = {
	    {"/proc/sys/kernel/shmmax", "16777216"},
	    {"/proc/sys/kernel/shmall", "536870912"},
	    {"/proc/sys/kernel/shmmni", "1024"},
	    {"/proc/sys/kernel/msgmax", "8192"},
	    {"/proc/sys/kernel/msgmni", "1024"},
	    {"/proc/sys/kernel/msgmnb", "1024"},
	    {"/proc/sys/kernel/sem", "1024 1048576 500 1024"},
	};
	unsigned i;
	for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++)
		write_file(sysctls[i].name, sysctls[i].value);
}

static int wait_for_loop(int pid)
{
	if (pid < 0)
	exit(1);
	int status = 0;
	while (waitpid(-1, &status, __WALL) != pid) {
	}
	return WEXITSTATUS(status);
}

static void drop_caps(void)
{
	struct __user_cap_header_struct cap_hdr = {};
	struct __user_cap_data_struct cap_data[2] = {};
	cap_hdr.version = _LINUX_CAPABILITY_VERSION_3;
	cap_hdr.pid = getpid();
	if (syscall(SYS_capget, &cap_hdr, &cap_data))
	exit(1);
	const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE);
	cap_data[0].effective &= ~drop;
	cap_data[0].permitted &= ~drop;
	cap_data[0].inheritable &= ~drop;
	if (syscall(SYS_capset, &cap_hdr, &cap_data))
	exit(1);
}

static int do_sandbox_none(void)
{
	if (unshare(CLONE_NEWPID)) {
	}
	int pid = fork();
	if (pid != 0)
		return wait_for_loop(pid);
	setup_common();
	sandbox_common();
	drop_caps();
	initialize_netdevices_init();
	if (unshare(CLONE_NEWNET)) {
	}
	write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535");
	initialize_netdevices();
	setup_binderfs();
	loop();
	exit(1);
}

uint64_t r[1] = {0xffffffffffffffff};

void loop(void)
{
		intptr_t res = 0;
	res = syscall(__NR_socket, /*domain=*/0x15ul, /*type=*/5ul, /*proto=*/0);
	if (res != -1)
		r[0] = res;
*(uint8_t*)0x200000c0 = r[0];
*(uint16_t*)0x200000c1 = r[0];
*(uint8_t*)0x200000c3 = r[0];
sprintf((char*)0x200000c4, "0x%016llx", (long long)r[0]);
*(uint8_t*)0x200000d6 = 0;
*(uint64_t*)0x200000d7 = r[0];
*(uint8_t*)0x200000df = 0;
*(uint16_t*)0x200000e0 = -1;
*(uint32_t*)0x200000e2 = -1;
*(uint8_t*)0x200000e6 = -1;
	syscall(__NR_setsockopt, /*fd=*/r[0], /*level=*/0x114, /*opt=*/0xa, /*val=*/0x200000c0ul, /*len=*/4ul);
*(uint16_t*)0x20000080 = 2;
*(uint16_t*)0x20000082 = htobe16(0);
*(uint8_t*)0x20000084 = 0xac;
*(uint8_t*)0x20000085 = 0x14;
*(uint8_t*)0x20000086 = 0x14;
*(uint8_t*)0x20000087 = 0xaa;
	syscall(__NR_connect, /*fd=*/r[0], /*addr=*/0x20000080ul, /*addrlen=*/0x10ul);
*(uint16_t*)0x20000540 = 2;
*(uint16_t*)0x20000542 = htobe16(0);
*(uint8_t*)0x20000544 = 0xac;
*(uint8_t*)0x20000545 = 0x14;
*(uint8_t*)0x20000546 = 0x14;
*(uint8_t*)0x20000547 = 0xaa;
	syscall(__NR_bind, /*fd=*/r[0], /*addr=*/0x20000540ul, /*addrlen=*/0x10ul);
	syscall(__NR_sendto, /*fd=*/r[0], /*buf=*/0ul, /*len=*/0ul, /*f=*/0ul, /*addr=*/0ul, /*addrlen=*/0ul);
	syscall(__NR_recvfrom, /*fd=*/r[0], /*buf=*/0ul, /*len=*/0ul, /*f=*/0ul, /*addr=*/0ul, /*addrlen=*/0ul);

}
int main(void)
{
		syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
	syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
	syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
			do_sandbox_none();
	return 0;
}