==================================================================
BUG: KASAN: use-after-free in inet_twsk_kill+0x358/0x3c0 net/ipv4/inet_timewait_sock.c:46
Read of size 8 at addr ffff8880233f9f40 by task syz-executor.4/3638
CPU: 0 PID: 3638 Comm: syz-executor.4 Not tainted 5.17.0-rc1-next-20220127-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+0xa5/0x3e0 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:finish_task_switch.isra.0+0x323/0xb80 kernel/sched/core.c:4866
Code: 93 97 0a 08 85 c0 75 02 0f 0b 48 85 db 0f 85 25 01 00 00 4c 89 f7 e8 fc f7 ff ff e8 67 a6 2d 00 fb 65 48 8b 1c 25 00 70 02 00 <48> 8d bb 88 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc900028bfad8 EFLAGS: 00000206
RAX: 000000000049ad6f RBX: ffff88807f2457c0 RCX: 1ffffffff1b2bef9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900028bfb20 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817eb9d8 R11: 0000000000000001 R12: ffff8880b9c3a998
R13: ffff88802eb13a80 R14: ffff8880b9c39c40 R15: ffff8880b9c3a678
context_switch kernel/sched/core.c:4989 [inline]
__schedule+0xaba/0x4db0 kernel/sched/core.c:6295
schedule+0xd2/0x260 kernel/sched/core.c:6368
freezable_schedule include/linux/freezer.h:172 [inline]
do_nanosleep+0x24e/0x690 kernel/time/hrtimer.c:2044
hrtimer_nanosleep+0x1f9/0x4a0 kernel/time/hrtimer.c:2097
common_nsleep+0xa2/0xc0 kernel/time/posix-timers.c:1227
__do_sys_clock_nanosleep kernel/time/posix-timers.c:1267 [inline]
__se_sys_clock_nanosleep kernel/time/posix-timers.c:1245 [inline]
__x64_sys_clock_nanosleep+0x2f4/0x430 kernel/time/posix-timers.c:1245
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: 0033:0x7f31e7f66d81
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 aa e7 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 e3 e7 ff ff 48 8b 04 24 eb 97 66 2e 0f 1f
RSP: 002b:00007ffdf367d0d0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 000000000000051b RCX: 00007f31e7f66d81
RDX: 00007ffdf367d110 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffdf367d19c R08: 0000000000000000 R09: 00007ffdf3793080
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032
R13: 00000000000a4d48 R14: 0000000000000013 R15: 00007ffdf367d200
Allocated by task 3641:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:436 [inline]
__kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
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
The buggy address belongs to the object at ffff8880233f9a80
which belongs to the cache net_namespace of size 6528
The buggy address is located 1216 bytes inside of
6528-byte region [ffff8880233f9a80, ffff8880233fb400)
The buggy address belongs to the page:
page:ffffea00008cfe00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880233f9a80 pfn:0x233f8
head:ffffea00008cfe00 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff888019be4f81
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001a88a00 dead000000000003 ffff8880118d5a00
raw: ffff8880233f9a80 0000000080040003 00000001ffffffff ffff888019be4f81
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 3639, ts 178057740137, free_ts 174489511535
prep_new_page mm/page_alloc.c:2434 [inline]
get_page_from_freelist+0xa72/0x2f40 mm/page_alloc.c:4165
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5381
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+0x28d/0x380 mm/slub.c:2004
___slab_alloc+0x6be/0xd60 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+0x414/0xb60 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
__put_page+0x1c1/0x2b0 mm/swap.c:128
folio_put include/linux/mm.h:1199 [inline]
put_page include/linux/mm.h:1237 [inline]
__skb_frag_unref include/linux/skbuff.h:3179 [inline]
skb_release_data+0x4a7/0x870 net/core/skbuff.c:672
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb+0x46/0x60 net/core/skbuff.c:756
__sk_defer_free_flush net/ipv4/tcp.c:1592 [inline]
sk_defer_free_flush include/net/tcp.h:1379 [inline]
tcp_recvmsg+0x1ca/0x610 net/ipv4/tcp.c:2566
inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:850
sock_recvmsg_nosec net/socket.c:948 [inline]
sock_recvmsg net/socket.c:966 [inline]
sock_recvmsg net/socket.c:962 [inline]
sock_read_iter+0x33c/0x470 net/socket.c:1039
call_read_iter include/linux/fs.h:2068 [inline]
new_sync_read+0x5c2/0x6e0 fs/read_write.c:401
vfs_read+0x35c/0x600 fs/read_write.c:482
ksys_read+0x1ee/0x250 fs/read_write.c:620
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:
ffff8880233f9e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880233f9e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880233f9f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880233f9f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880233fa000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
vkms_vblank_simulate: vblank timer overrun
----------------
Code disassembly (best guess):
0: 93 xchg %eax,%ebx
1: 97 xchg %eax,%edi
2: 0a 08 or (%rax),%cl
4: 85 c0 test %eax,%eax
6: 75 02 jne 0xa
8: 0f 0b ud2
a: 48 85 db test %rbx,%rbx
d: 0f 85 25 01 00 00 jne 0x138
13: 4c 89 f7 mov %r14,%rdi
16: e8 fc f7 ff ff callq 0xfffff817
1b: e8 67 a6 2d 00 callq 0x2da687
20: fb sti
21: 65 48 8b 1c 25 00 70 mov %gs:0x27000,%rbx
28: 02 00
* 2a: 48 8d bb 88 15 00 00 lea 0x1588(%rbx),%rdi <-- trapping instruction
31: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
38: fc ff df
3b: 48 89 fa mov %rdi,%rdx
3e: 48 rex.W
3f: c1 .byte 0xc1