==================================================================
BUG: KASAN: use-after-free in tcp_retransmit_timer+0x6ee/0x2890 net/ipv4/tcp_timer.c:515
Read of size 8 at addr ffff88807c3e1c98 by task syz-executor.3/6990
CPU: 1 PID: 6990 Comm: syz-executor.3 Not tainted 5.15.104-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
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:seqcount_lockdep_reader_access+0x185/0x1e0 include/linux/seqlock.h:106
Code: 42 80 3c 23 00 74 08 4c 89 ff e8 f6 5d 09 00 f6 44 24 41 02 75 4c f7 44 24 18 00 02 00 00 74 01 fb 48 c7 44 24 20 0e 36 e0 45 <4b> c7 04 34 00 00 00 00 66 43 c7 44 34 09 00 00 43 c6 44 34 0b 00
RSP: 0018:ffffc900033ce520 EFLAGS: 00000206
RAX: 1d541d30e0cbd600 RBX: 1ffff92000679cac RCX: ffffffff8162a208
RDX: dffffc0000000000 RSI: ffffffff8a8af0e0 RDI: ffffffff8ad85100
RBP: ffffc900033ce600 R08: dffffc0000000000 R09: fffffbfff1f76c28
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88813fffb7c0 R14: 1ffff92000679ca8 R15: ffffc900033ce560
read_seqbegin include/linux/seqlock.h:840 [inline]
zone_span_seqbegin include/linux/memory_hotplug.h:83 [inline]
page_outside_zone_boundaries mm/page_alloc.c:580 [inline]
bad_range+0x77/0x2c0 mm/page_alloc.c:607
rmqueue mm/page_alloc.c:3736 [inline]
get_page_from_freelist+0x3209/0x33c0 mm/page_alloc.c:4156
__alloc_pages+0x272/0x700 mm/page_alloc.c:5421
__page_cache_alloc+0xd4/0x4a0 mm/filemap.c:1022
pagecache_get_page+0xa91/0x1010 mm/filemap.c:1940
grab_cache_page_write_begin+0x57/0x90 mm/filemap.c:3730
ext4_da_write_begin+0x599/0xb60 fs/ext4/inode.c:2990
generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776
ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269
ext4_file_write_iter+0x87c/0x1990
__kernel_write+0x5b1/0xa60 fs/read_write.c:539
__dump_emit+0x264/0x3a0 fs/coredump.c:875
dump_user_range+0x91/0x320 fs/coredump.c:949
elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285
do_coredump+0x1852/0x31e0 fs/coredump.c:826
get_signal+0xc06/0x14e0 kernel/signal.c:2875
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:207
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:313
exc_page_fault+0x342/0x740 arch/x86/mm/fault.c:1544
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:568
RIP: 0033:0x7f3a5abbcec7
Code: 38 5d 41 5c c3 48 8d 3d ad ea 0b 00 e8 72 f8 ff ff 48 8d 3d af ea 0b 00 e8 66 f8 ff ff 66 0f 1f 44 00 00 55 89 fd 48 83 ec 10 <64> 8b 04 25 b4 ff ff ff 85 c0 74 2a 89 fe 31 c0 bf 3c 00 00 00 e8
RSP: 002b:00007f3a59174260 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 00007f3a5ad40f80 RCX: 00007f3a5ac210f9
RDX: 00007f3a59174280 RSI: 00007f3a591743b0 RDI: 000000000000000b
RBP: 000000000000000b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffe781e727f R14: 00007f3a59193300 R15: 0000000000022000
Allocated by task 3611:
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
Freed by task 144:
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]
kmem_cache_free+0x91/0x1f0 mm/slub.c:3515
net_free net/core/net_namespace.c:434 [inline]
cleanup_net+0xab5/0xb60 net/core/net_namespace.c:617
process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2306
worker_thread+0xaca/0x1280 kernel/workqueue.c:2453
kthread+0x3f6/0x4f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
The buggy address belongs to the object at ffff88807c3e1a40
which belongs to the cache net_namespace of size 6464
The buggy address is located 600 bytes inside of
6464-byte region [ffff88807c3e1a40, ffff88807c3e3380)
The buggy address belongs to the page:
page:ffffea0001f0f800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807c3e3480 pfn:0x7c3e0
head:ffffea0001f0f800 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88801f812041
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001d68008 ffff888011dd1288 ffff8881400043c0
raw: ffff88807c3e3480 0000000000040003 00000001ffffffff ffff88801f812041
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 3616, ts 61063419119, free_ts 61062249694
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:
ffff88807c3e1b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807c3e1c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807c3e1c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807c3e1d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807c3e1d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 42 80 3c 23 00 cmpb $0x0,(%rbx,%r12,1)
5: 74 08 je 0xf
7: 4c 89 ff mov %r15,%rdi
a: e8 f6 5d 09 00 callq 0x95e05
f: f6 44 24 41 02 testb $0x2,0x41(%rsp)
14: 75 4c jne 0x62
16: f7 44 24 18 00 02 00 testl $0x200,0x18(%rsp)
1d: 00
1e: 74 01 je 0x21
20: fb sti
21: 48 c7 44 24 20 0e 36 movq $0x45e0360e,0x20(%rsp)
28: e0 45
* 2a: 4b c7 04 34 00 00 00 movq $0x0,(%r12,%r14,1) <-- trapping instruction
31: 00
32: 66 43 c7 44 34 09 00 movw $0x0,0x9(%r12,%r14,1)
39: 00
3a: 43 c6 44 34 0b 00 movb $0x0,0xb(%r12,%r14,1)