==================================================================
BUG: KASAN: use-after-free in inet_twsk_kill+0x358/0x3c0 net/ipv4/inet_timewait_sock.c:46
Read of size 8 at addr ffff88807a1639c0 by task syz-executor.0/15045
CPU: 1 PID: 15045 Comm: syz-executor.0 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0x8d/0x336 mm/kasan/report.c:255
__kasan_report mm/kasan/report.c:442 [inline]
kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
inet_twsk_kill+0x358/0x3c0 net/ipv4/inet_timewait_sock.c:46
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers.part.0+0x67c/0xa30 kernel/time/timer.c:1734
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:6711
Code: 55 53 65 48 8b 1c 25 00 70 02 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 e2 df 01 f8 e8 dd f8 2f f8 fb bf 01 00 00 00 c2 a3 ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 10 cf 01
RSP: 0018:ffffc9000363f818 EFLAGS: 00000206
RAX: 0000000000000da5 RBX: ffff8880205c0000 RCX: 1ffffffff1b28941
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffed10040b8000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817e98b8 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
irqentry_exit+0x31/0x80 kernel/entry/common.c:425
asm_sysvec_reschedule_ipi+0x12/0x20 arch/x86/include/asm/idtentry.h:643
RIP: 0010:dump_stack_lvl+0x12c/0x134 lib/dump_stack.c:108
Code: 48 85 ed 74 0a e8 dd 86 5f f8 e8 78 16 34 00 e8 d3 86 5f f8 31 ff 48 89 de e8 59 89 5f f8 48 85 db 74 06 e8 bf 86 5f f8 fb 5b <5d> 41 5c e9 b5 86 5f f8 e8 b0 86 5f f8 48 c7 c7 c0 3f 09 8a e9 bb
RSP: 0018:ffffc9000363f8e0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 1ffff920006c7f23 RCX: 0000000000000000
RDX: ffff8880205c0000 RSI: ffffffff8918cc71 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff8918cc67 R11: 0000000000000000 R12: ffffffff8a093fc0
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880205c0000
warn_alloc.cold+0x9b/0x189 mm/page_alloc.c:4238
__vmalloc_area_node mm/vmalloc.c:2979 [inline]
__vmalloc_node_range+0xe1e/0x1060 mm/vmalloc.c:3107
alloc_thread_stack_node kernel/fork.c:245 [inline]
dup_task_struct kernel/fork.c:887 [inline]
copy_process+0x926/0x7300 kernel/fork.c:1998
kernel_clone+0xe7/0xab0 kernel/fork.c:2555
__do_sys_clone+0xc8/0x110 kernel/fork.c:2672
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fadd4b7d481
Code: 48 85 ff 74 3d 48 85 f6 74 38 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 7c 13 74 01 c3 31 ed 58 5f ff d0 48 89 c7 b8 3c 00 00 00
RSP: 002b:00007ffecc797308 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fadd340a700 RCX: 00007fadd4b7d481
RDX: 00007fadd340a9d0 RSI: 00007fadd340a2f0 RDI: 00000000003d0f00
RBP: 00007ffecc797550 R08: 00007fadd340a700 R09: 00007fadd340a700
R10: 00007fadd340a9d0 R11: 0000000000000206 R12: 00007ffecc7973be
R13: 00007ffecc7973bf R14: 00007fadd340a300 R15: 0000000000022000
Allocated by task 14742:
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:437 [inline]
__kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:470
kasan_slab_alloc include/linux/kasan.h:260 [inline]
slab_post_alloc_hook mm/slab.h:732 [inline]
slab_alloc_node mm/slub.c:3230 [inline]
slab_alloc mm/slub.c:3238 [inline]
kmem_cache_alloc+0x202/0x3a0 mm/slub.c:3243
kmem_cache_zalloc include/linux/slab.h:705 [inline]
net_alloc net/core/net_namespace.c:407 [inline]
copy_net_ns+0x125/0x760 net/core/net_namespace.c:462
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x445/0x920 kernel/fork.c:3048
__do_sys_unshare kernel/fork.c:3119 [inline]
__se_sys_unshare kernel/fork.c:3117 [inline]
__x64_sys_unshare+0x2d/0x40 kernel/fork.c:3117
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Freed by task 14742:
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
kasan_set_track+0x21/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
____kasan_slab_free mm/kasan/common.c:367 [inline]
____kasan_slab_free+0x130/0x160 mm/kasan/common.c:329
kasan_slab_free include/linux/kasan.h:236 [inline]
slab_free_hook mm/slub.c:1728 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754
slab_free mm/slub.c:3509 [inline]
kmem_cache_free+0xd8/0x340 mm/slub.c:3526
net_free net/core/net_namespace.c:436 [inline]
net_free net/core/net_namespace.c:432 [inline]
copy_net_ns+0x590/0x760 net/core/net_namespace.c:485
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x445/0x920 kernel/fork.c:3048
__do_sys_unshare kernel/fork.c:3119 [inline]
__se_sys_unshare kernel/fork.c:3117 [inline]
__x64_sys_unshare+0x2d/0x40 kernel/fork.c:3117
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
The buggy address belongs to the object at ffff88807a163500
which belongs to the cache net_namespace of size 6528
The buggy address is located 1216 bytes inside of
6528-byte region [ffff88807a163500, ffff88807a164e80)
The buggy address belongs to the page:
page:ffffea0001e85800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7a160
head:ffffea0001e85800 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88801e39c641
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001f65600 dead000000000002 ffff88814479c000
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88801e39c641
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3636, ts 123417445285, free_ts 123416688600
prep_new_page mm/page_alloc.c:2434 [inline]
get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4165
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5389
alloc_pages+0x1aa/0x310 mm/mempolicy.c:2271
alloc_slab_page mm/slub.c:1799 [inline]
allocate_slab mm/slub.c:1944 [inline]
new_slab+0x28a/0x3b0 mm/slub.c:2004
___slab_alloc+0x87c/0xe90 mm/slub.c:3018
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105
slab_alloc_node mm/slub.c:3196 [inline]
slab_alloc mm/slub.c:3238 [inline]
kmem_cache_alloc+0x35c/0x3a0 mm/slub.c:3243
kmem_cache_zalloc include/linux/slab.h:705 [inline]
net_alloc net/core/net_namespace.c:407 [inline]
copy_net_ns+0x125/0x760 net/core/net_namespace.c:462
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x445/0x920 kernel/fork.c:3048
__do_sys_unshare kernel/fork.c:3119 [inline]
__se_sys_unshare kernel/fork.c:3117 [inline]
__x64_sys_unshare+0x2d/0x40 kernel/fork.c:3117
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1352 [inline]
free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1404
free_unref_page_prepare mm/page_alloc.c:3325 [inline]
free_unref_page+0x19/0x690 mm/page_alloc.c:3404
skb_free_head net/core/skbuff.c:655 [inline]
skb_release_data+0x65d/0x790 net/core/skbuff.c:677
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb net/core/skbuff.c:756 [inline]
consume_skb net/core/skbuff.c:914 [inline]
consume_skb+0xc2/0x160 net/core/skbuff.c:908
skb_free_datagram+0x1b/0x1f0 net/core/datagram.c:325
netlink_recvmsg+0x636/0xea0 net/netlink/af_netlink.c:1998
sock_recvmsg_nosec net/socket.c:948 [inline]
sock_recvmsg net/socket.c:966 [inline]
sock_recvmsg net/socket.c:962 [inline]
____sys_recvmsg+0x2c4/0x600 net/socket.c:2632
___sys_recvmsg+0x127/0x200 net/socket.c:2674
__sys_recvmsg+0xe2/0x1a0 net/socket.c:2704
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Memory state around the buggy address:
ffff88807a163880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807a163900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807a163980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807a163a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807a163a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 55 push %rbp
1: 53 push %rbx
2: 65 48 8b 1c 25 00 70 mov %gs:0x27000,%rbx
9: 02 00
b: 48 89 dd mov %rbx,%rbp
e: 48 c1 ed 03 shr $0x3,%rbp
12: 48 01 c5 add %rax,%rbp
15: bf 01 00 00 00 mov $0x1,%edi
1a: e8 e2 df 01 f8 callq 0xf801e001
1f: e8 dd f8 2f f8 callq 0xf82ff901
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 c2 a3 ff ff callq 0xffffa3f1 <-- trapping instruction
2f: 9c pushfq
30: 58 pop %rax
31: fa cli
32: f6 c4 02 test $0x2,%ah
35: 75 27 jne 0x5e
37: bf 01 00 00 00 mov $0x1,%edi
3c: e8 .byte 0xe8
3d: 10 cf adc %cl,%bh
3f: 01 .byte 0x1