==================================================================
BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:388 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler+0x7ef/0x930 net/ipv4/tcp_timer.c:652
Read of size 1 at addr ffff8881621e8745 by task kworker/u4:4/56
CPU: 0 PID: 56 Comm: kworker/u4:4 Not tainted 6.1.82-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Workqueue: events_unbound flush_to_ldisc
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_address_description mm/kasan/report.c:284 [inline]
print_report+0x15f/0x4f0 mm/kasan/report.c:395
kasan_report+0x136/0x160 mm/kasan/report.c:495
tcp_probe_timer net/ipv4/tcp_timer.c:388 [inline]
tcp_write_timer_handler+0x7ef/0x930 net/ipv4/tcp_timer.c:652
tcp_write_timer+0x12e/0x280 net/ipv4/tcp_timer.c:665
call_timer_fn+0x1ad/0x6b0 kernel/time/timer.c:1474
expire_timers kernel/time/timer.c:1519 [inline]
__run_timers+0x67c/0x890 kernel/time/timer.c:1790
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1803
__do_softirq+0x2e9/0xa4c kernel/softirq.c:571
invoke_softirq kernel/softirq.c:445 [inline]
__irq_exit_rcu+0x155/0x240 kernel/softirq.c:650
irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1106
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:arch_test_and_set_bit arch/x86/include/asm/bitops.h:138 [inline]
RIP: 0010:test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:72 [inline]
RIP: 0010:queue_work_on+0x1f4/0x250 kernel/workqueue.c:1547
Code: 11 e8 20 32 31 00 4d 85 e4 75 16 e8 16 32 31 00 eb 15 e8 0f 32 31 00 e8 aa 36 30 09 4d 85 e4 74 ea e8 00 32 31 00 fb 45 84 ed <0f> 94 c0 48 c7 44 24 20 0e 36 e0 45 48 b9 00 00 00 00 00 fc ff df
RSP: 0018:ffffc900015777c0 EFLAGS: 00000246
RAX: ffffffff81595190 RBX: 0000000000000000 RCX: ffff88801a6b5940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90001577888 R08: ffffffff81595166 R09: fffffbfff2092c59
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000200
R13: 0000000000000000 R14: 0000000000000046 R15: 1ffff920002aeefc
queue_work include/linux/workqueue.h:512 [inline]
tty_insert_flip_string_and_push_buffer+0x329/0x390 drivers/tty/tty_buffer.c:634
tty_put_char+0x116/0x180 drivers/tty/tty_io.c:3141
__process_echoes+0x462/0x920 drivers/tty/n_tty.c:716
flush_echoes drivers/tty/n_tty.c:817 [inline]
__receive_buf drivers/tty/n_tty.c:1615 [inline]
n_tty_receive_buf_common+0xd1c/0x1410 drivers/tty/n_tty.c:1711
tty_port_default_receive_buf+0x6a/0x90 drivers/tty/tty_port.c:39
receive_buf drivers/tty/tty_buffer.c:515 [inline]
flush_to_ldisc+0x2f4/0x840 drivers/tty/tty_buffer.c:565
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:307
Allocated by task 3579:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
__kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
slab_alloc_node mm/slub.c:3398 [inline]
slab_alloc mm/slub.c:3406 [inline]
__kmem_cache_alloc_lru mm/slub.c:3413 [inline]
kmem_cache_alloc+0x10c/0x2d0 mm/slub.c:3422
kmem_cache_zalloc include/linux/slab.h:682 [inline]
net_alloc net/core/net_namespace.c:410 [inline]
copy_net_ns+0x143/0x5d0 net/core/net_namespace.c:465
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:3203
__do_sys_unshare kernel/fork.c:3274 [inline]
__se_sys_unshare kernel/fork.c:3272 [inline]
__x64_sys_unshare+0x34/0x40 kernel/fork.c:3272
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Last potentially related work creation:
kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486
insert_work+0x54/0x3d0 kernel/workqueue.c:1361
__queue_work+0xb4b/0xf90 kernel/workqueue.c:1520
call_timer_fn+0x1ad/0x6b0 kernel/time/timer.c:1474
expire_timers kernel/time/timer.c:1514 [inline]
__run_timers+0x6a8/0x890 kernel/time/timer.c:1790
__do_softirq+0x2e9/0xa4c kernel/softirq.c:571
Second to last potentially related work creation:
kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486
insert_work+0x54/0x3d0 kernel/workqueue.c:1361
__queue_work+0xb4b/0xf90 kernel/workqueue.c:1520
queue_work_on+0x14b/0x250 kernel/workqueue.c:1548
queue_work include/linux/workqueue.h:512 [inline]
schedule_work include/linux/workqueue.h:573 [inline]
xfrm_hash_grow_check net/xfrm/xfrm_state.c:1025 [inline]
__find_acq_core+0x1073/0x1470 net/xfrm/xfrm_state.c:1418
xfrm_find_acq+0x68/0x90 net/xfrm/xfrm_state.c:1844
xfrm_alloc_userspi+0x634/0xc90 net/xfrm/xfrm_user.c:1582
xfrm_user_rcv_msg+0x6f0/0xa40 net/xfrm/xfrm_user.c:3105
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2508
xfrm_netlink_rcv+0x70/0x80 net/xfrm/xfrm_user.c:3127
netlink_unicast_kernel net/netlink/af_netlink.c:1326 [inline]
netlink_unicast+0x7d8/0x970 net/netlink/af_netlink.c:1352
netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1874
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:730 [inline]
____sys_sendmsg+0x5a5/0x8f0 net/socket.c:2514
___sys_sendmsg net/socket.c:2568 [inline]
__sys_sendmsg+0x2a9/0x390 net/socket.c:2597
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x63/0xcd
The buggy address belongs to the object at ffff8881621e8000
which belongs to the cache net_namespace of size 6976
The buggy address is located 1861 bytes inside of
6976-byte region [ffff8881621e8000, ffff8881621e9b40)
The buggy address belongs to the physical page:
page:ffffea0005887a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8881621e8000 pfn:0x1621e8
head:ffffea0005887a00 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88814b2a4781
flags: 0x57ff00000010200(slab|head|node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000010200 0000000000000000 dead000000000001 ffff888140009500
raw: ffff8881621e8000 0000000080040000 00000001ffffffff ffff88814b2a4781
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 3579, tgid 3579 (syz-executor.1), ts 184140056364, free_ts 0
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513
prep_new_page mm/page_alloc.c:2520 [inline]
get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279
__alloc_pages+0x28d/0x770 mm/page_alloc.c:5545
alloc_slab_page+0x6a/0x150 mm/slub.c:1794
allocate_slab mm/slub.c:1939 [inline]
new_slab+0x84/0x2d0 mm/slub.c:1992
___slab_alloc+0xc20/0x1270 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
slab_alloc mm/slub.c:3406 [inline]
__kmem_cache_alloc_lru mm/slub.c:3413 [inline]
kmem_cache_alloc+0x1a5/0x2d0 mm/slub.c:3422
kmem_cache_zalloc include/linux/slab.h:682 [inline]
net_alloc net/core/net_namespace.c:410 [inline]
copy_net_ns+0x143/0x5d0 net/core/net_namespace.c:465
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:3203
__do_sys_unshare kernel/fork.c:3274 [inline]
__se_sys_unshare kernel/fork.c:3272 [inline]
__x64_sys_unshare+0x34/0x40 kernel/fork.c:3272
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x63/0xcd
page_owner free stack trace missing
Memory state around the buggy address:
ffff8881621e8600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881621e8680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881621e8700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881621e8780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881621e8800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 11 e8 adc %ebp,%eax
2: 20 32 and %dh,(%rdx)
4: 31 00 xor %eax,(%rax)
6: 4d 85 e4 test %r12,%r12
9: 75 16 jne 0x21
b: e8 16 32 31 00 call 0x313226
10: eb 15 jmp 0x27
12: e8 0f 32 31 00 call 0x313226
17: e8 aa 36 30 09 call 0x93036c6
1c: 4d 85 e4 test %r12,%r12
1f: 74 ea je 0xb
21: e8 00 32 31 00 call 0x313226
26: fb sti
27: 45 84 ed test %r13b,%r13b
* 2a: 0f 94 c0 sete %al <-- trapping instruction
2d: 48 c7 44 24 20 0e 36 movq $0x45e0360e,0x20(%rsp)
34: e0 45
36: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
3d: fc ff df