==================================================================
BUG: KASAN: use-after-free in tcp_retransmit_timer+0x6ee/0x2890 net/ipv4/tcp_timer.c:515
Read of size 8 at addr ffff888023300258 by task udevd/2961
CPU: 0 PID: 2961 Comm: udevd Not tainted 5.15.113-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/16/2023
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_address_description+0x63/0x3b0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
tcp_retransmit_timer+0x6ee/0x2890 net/ipv4/tcp_timer.c:515
tcp_write_timer_handler+0x1f7/0x9c0 net/ipv4/tcp_timer.c:626
tcp_write_timer+0x12e/0x280 net/ipv4/tcp_timer.c:646
call_timer_fn+0x16d/0x560 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers+0x67c/0x890 kernel/time/timer.c:1737
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1750
__do_softirq+0x3b3/0x93a kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x155/0x240 kernel/softirq.c:636
irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1096
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:330 [inline]
RIP: 0010:rcu_is_watching+0x13/0xa0 kernel/rcu/tree.c:1122
Code: 00 02 00 00 75 b4 eb b3 e8 8a e3 af 08 66 2e 0f 1f 84 00 00 00 00 00 41 57 41 56 53 65 ff 05 bc aa 97 7e e8 2f f7 af 08 89 c3 <83> f8 08 73 72 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd e0 b7 34
RSP: 0018:ffffc90002c6f700 EFLAGS: 00000286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81628438
RDX: 0000000000000000 RSI: ffffffff8ad85ea0 RDI: ffffffff8ad85e60
RBP: ffffc90002c6f850 R08: dffffc0000000000 R09: fffffbfff1bc76ce
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff9200058def0
R13: ffffffff818d3495 R14: 00007f692045a37f R15: dffffc0000000000
trace_lock_release include/trace/events/lock.h:58 [inline]
lock_release+0xb9/0x9a0 kernel/locking/lockdep.c:5633
rcu_read_unlock include/linux/rcupdate.h:729 [inline]
is_bpf_text_address+0x24f/0x260 kernel/bpf/core.c:719
kernel_text_address kernel/extable.c:151 [inline]
__kernel_text_address+0x94/0x100 kernel/extable.c:105
unwind_get_return_address+0x49/0x80 arch/x86/kernel/unwind_orc.c:323
arch_stack_walk+0xf3/0x140 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x113/0x1c0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x80 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1705 [inline]
slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731
slab_free mm/slub.c:3499 [inline]
kfree+0xf1/0x270 mm/slub.c:4559
kernfs_fop_release+0x1e0/0x2b0 fs/kernfs/file.c:760
__fput+0x3bf/0x890 fs/file_table.c:280
task_work_run+0x129/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f692045a37f
Code: af 6a 0d 00 f7 d8 64 89 02 48 83 c8 ff 44 89 c7 48 89 04 24 e8 e1 fc f9 ff 48 8b 04 24 48 83 c4 28 c3 c3 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 10 48 8b 15 7a 6a 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffd8f6dc518 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000562de30187d0 RCX: 00007f692045a37f
RDX: 00007f692052d860 RSI: 0000562de3077b40 RDI: 000000000000000c
RBP: 0000000000000000 R08: 0000562de3077b40 R09: 00000000000003a0
R10: 000000000000010f R11: 0000000000000202 R12: 0000000000000000
R13: 0000562de30266b0 R14: 00007ffd8f6dc868 R15: 0000000000000000
Allocated by task 3531:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
__kasan_slab_alloc+0x8e/0xc0 mm/kasan/common.c:467
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233
kmem_cache_zalloc include/linux/slab.h:711 [inline]
net_alloc net/core/net_namespace.c:405 [inline]
copy_net_ns+0x143/0x5d0 net/core/net_namespace.c:460
create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226
ksys_unshare+0x580/0xb20 kernel/fork.c:3094
__do_sys_unshare kernel/fork.c:3168 [inline]
__se_sys_unshare kernel/fork.c:3166 [inline]
__x64_sys_unshare+0x34/0x40 kernel/fork.c:3166
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
The buggy address belongs to the object at ffff888023300000
which belongs to the cache net_namespace of size 6464
The buggy address is located 600 bytes inside of
6464-byte region [ffff888023300000, ffff888023301940)
The buggy address belongs to the page:
page:ffffea00008cc000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888023304ec0 pfn:0x23300
head:ffffea00008cc000 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff8880559a9f81
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001b3d400 0000000200000002 ffff888011dc63c0
raw: ffff888023304ec0 0000000080040001 00000001ffffffff ffff8880559a9f81
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 3531, ts 94541779781, free_ts 94518235705
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159
__alloc_pages+0x272/0x700 mm/page_alloc.c:5421
alloc_slab_page mm/slub.c:1775 [inline]
allocate_slab mm/slub.c:1912 [inline]
new_slab+0xbb/0x4b0 mm/slub.c:1975
___slab_alloc+0x6f6/0xe10 mm/slub.c:3008
__slab_alloc mm/slub.c:3095 [inline]
slab_alloc_node mm/slub.c:3186 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0x18e/0x280 mm/slub.c:3233
kmem_cache_zalloc include/linux/slab.h:711 [inline]
net_alloc net/core/net_namespace.c:405 [inline]
copy_net_ns+0x143/0x5d0 net/core/net_namespace.c:460
create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226
ksys_unshare+0x580/0xb20 kernel/fork.c:3094
__do_sys_unshare kernel/fork.c:3168 [inline]
__se_sys_unshare kernel/fork.c:3166 [inline]
__x64_sys_unshare+0x34/0x40 kernel/fork.c:3166
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1340 [inline]
free_pcp_prepare mm/page_alloc.c:1391 [inline]
free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317
free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396
free_slab mm/slub.c:2015 [inline]
discard_slab mm/slub.c:2021 [inline]
__unfreeze_partials+0x1b7/0x210 mm/slub.c:2507
put_cpu_partial+0x132/0x1a0 mm/slub.c:2587
do_slab_free mm/slub.c:3487 [inline]
___cache_free+0xe3/0x100 mm/slub.c:3506
qlist_free_all+0x36/0x90 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233
skb_clone+0x1bb/0x350 net/core/skbuff.c:1523
hci_cmd_work+0xbf/0x340 net/bluetooth/hci_core.c:5189
process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2307
worker_thread+0xaca/0x1280 kernel/workqueue.c:2454
kthread+0x3f6/0x4f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
Memory state around the buggy address:
ffff888023300100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888023300180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888023300200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888023300280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888023300300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 00 02 add %al,(%rdx)
2: 00 00 add %al,(%rax)
4: 75 b4 jne 0xffffffba
6: eb b3 jmp 0xffffffbb
8: e8 8a e3 af 08 callq 0x8afe397
d: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
14: 00 00 00
17: 41 57 push %r15
19: 41 56 push %r14
1b: 53 push %rbx
1c: 65 ff 05 bc aa 97 7e incl %gs:0x7e97aabc(%rip) # 0x7e97aadf
23: e8 2f f7 af 08 callq 0x8aff757
28: 89 c3 mov %eax,%ebx
* 2a: 83 f8 08 cmp $0x8,%eax <-- trapping instruction
2d: 73 72 jae 0xa1
2f: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15
36: fc ff df
39: 4c rex.WR
3a: 8d .byte 0x8d
3b: 34 dd xor $0xdd,%al
3d: e0 b7 loopne 0xfffffff6
3f: 34 .byte 0x34