==================================================================
BUG: KASAN: use-after-free in tcp_retransmit_timer+0x6ee/0x2890 net/ipv4/tcp_timer.c:515
Read of size 8 at addr ffff88807e74b6d8 by task syz-executor.5/14237
CPU: 0 PID: 14237 Comm: syz-executor.5 Not tainted 5.15.105-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
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:1097
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:zap_pmd_range mm/memory.c:1494 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1523 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1544 [inline]
RIP: 0010:unmap_page_range+0xdd8/0x2630 mm/memory.c:1565
Code: 11 e8 2c 73 c8 ff eb 22 e8 25 73 c8 ff e9 8f 00 00 00 e8 1b 73 c8 ff 4c 89 ef e8 a3 ec f2 ff c7 84 24 94 00 00 00 01 00 00 00 <48> 8b 5c 24 40 89 de 83 e6 20 31 ff e8 57 76 c8 ff 89 d8 83 e0 20
RSP: 0018:ffffc9000342f420 EFLAGS: 00000293
RAX: ffffffff81b74794 RBX: 800000005fa00007 RCX: ffff888023369d00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000342f650 R08: ffffffff81b74788 R09: ffffed100466d3a1
R10: 0000000000000000 R11: dffffc0000000001 R12: 00007fc4f1282000
R13: ffffea00017e8000 R14: ffffea00017e8008 R15: dffffc0000000000
unmap_vmas+0x1f8/0x390 mm/memory.c:1642
exit_mmap+0x3b6/0x670 mm/mmap.c:3186
__mmput+0x112/0x3b0 kernel/fork.c:1118
exit_mm+0x688/0x7f0 kernel/exit.c:548
do_exit+0x626/0x2480 kernel/exit.c:859
do_group_exit+0x144/0x310 kernel/exit.c:994
get_signal+0xc66/0x14e0 kernel/signal.c:2889
arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
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: 0033:0x7fc4f2371169
Code: Unable to access opcode bytes at RIP 0x7fc4f237113f.
RSP: 002b:00007fc4f08e3168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 0000000000070000 RBX: 00007fc4f2490f80 RCX: 00007fc4f2371169
RDX: 0000000000020030 RSI: 0000000020000a80 RDI: 0000000000000003
RBP: 00007fc4f23ccca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd80cd5baf R14: 00007fc4f08e3300 R15: 0000000000022000
Allocated by task 3612:
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 ffff88807e74b480
which belongs to the cache net_namespace of size 6464
The buggy address is located 600 bytes inside of
6464-byte region [ffff88807e74b480, ffff88807e74cdc0)
The buggy address belongs to the page:
page:ffffea0001f9d200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807e74b480 pfn:0x7e748
head:ffffea0001f9d200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001e1cc00 0000000200000002 ffff888011dc63c0
raw: ffff88807e74b480 0000000080040000 00000001ffffffff 0000000000000000
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 3606, ts 64272660438, free_ts 64269372378
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_nonslab_page+0xe4/0x150 mm/slub.c:3535
kfree+0x1cf/0x270 mm/slub.c:4556
skb_free_head net/core/skbuff.c:655 [inline]
skb_release_data+0x73a/0x8a0 net/core/skbuff.c:677
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb net/core/skbuff.c:756 [inline]
consume_skb+0xa3/0x140 net/core/skbuff.c:914
skb_free_datagram+0x24/0xe0 net/core/datagram.c:325
netlink_recvmsg+0x5ef/0x1140 net/netlink/af_netlink.c:2030
____sys_recvmsg+0x286/0x530
___sys_recvmsg+0x1ec/0x690 net/socket.c:2673
__sys_recvmsg net/socket.c:2703 [inline]
__do_sys_recvmsg net/socket.c:2713 [inline]
__se_sys_recvmsg net/socket.c:2710 [inline]
__x64_sys_recvmsg+0x1dc/0x2b0 net/socket.c:2710
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
Memory state around the buggy address:
ffff88807e74b580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807e74b600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807e74b680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807e74b700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807e74b780: 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: 2c 73 sub $0x73,%al
4: c8 ff eb 22 enterq $0xebff,$0x22
8: e8 25 73 c8 ff callq 0xffc87332
d: e9 8f 00 00 00 jmpq 0xa1
12: e8 1b 73 c8 ff callq 0xffc87332
17: 4c 89 ef mov %r13,%rdi
1a: e8 a3 ec f2 ff callq 0xfff2ecc2
1f: c7 84 24 94 00 00 00 movl $0x1,0x94(%rsp)
26: 01 00 00 00
* 2a: 48 8b 5c 24 40 mov 0x40(%rsp),%rbx <-- trapping instruction
2f: 89 de mov %ebx,%esi
31: 83 e6 20 and $0x20,%esi
34: 31 ff xor %edi,%edi
36: e8 57 76 c8 ff callq 0xffc87692
3b: 89 d8 mov %ebx,%eax
3d: 83 e0 20 and $0x20,%eax