==================================================================
BUG: KASAN: use-after-free in tcp_retransmit_timer+0x6ee/0x2890 net/ipv4/tcp_timer.c:515
Read of size 8 at addr ffff88807e379c98 by task syz-executor.5/3624
CPU: 0 PID: 3624 Comm: syz-executor.5 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:constant_test_bit arch/x86/include/asm/bitops.h:207 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
RIP: 0010:page_needs_cow_for_dma include/linux/mm.h:1348 [inline]
RIP: 0010:copy_present_page mm/memory.c:903 [inline]
RIP: 0010:copy_present_pte mm/memory.c:949 [inline]
RIP: 0010:copy_pte_range mm/memory.c:1070 [inline]
RIP: 0010:copy_pmd_range mm/memory.c:1156 [inline]
RIP: 0010:copy_pud_range mm/memory.c:1193 [inline]
RIP: 0010:copy_p4d_range mm/memory.c:1217 [inline]
RIP: 0010:copy_page_range+0x1368/0x43b0 mm/memory.c:1290
Code: b8 78 05 00 00 48 01 c3 48 89 df be 08 00 00 00 e8 8d fc 11 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 48 89 df e8 de fa 11 00 48 8b 1b be 00 00 00 10 48 21 de 31
RSP: 0018:ffffc90002f3f5c0 EFLAGS: 00000246
RAX: 1ffff110032a00af RBX: ffff888019500578 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888019500578
RBP: ffffc90002f3f930 R08: dffffc0000000000 R09: ffffed10032a00b0
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888023175528
R13: 8000000048548845 R14: 1ffff11008c6edaa R15: ffff888023175578
dup_mmap kernel/fork.c:613 [inline]
dup_mm+0xad6/0x1230 kernel/fork.c:1457
copy_mm+0x101/0x190 kernel/fork.c:1509
copy_process+0x1816/0x3ef0 kernel/fork.c:2198
kernel_clone+0x210/0x960 kernel/fork.c:2601
__do_sys_clone kernel/fork.c:2718 [inline]
__se_sys_clone kernel/fork.c:2702 [inline]
__x64_sys_clone+0x23f/0x290 kernel/fork.c:2702
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
RIP: 0033:0x7fd8abad2e2b
Code: ed 0f 85 60 01 00 00 64 4c 8b 0c 25 10 00 00 00 45 31 c0 4d 8d 91 d0 02 00 00 31 d2 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 89 00 00 00 41 89 c5 85 c0 0f 85 90 00 00
RSP: 002b:00007ffe1e08c410 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd8abad2e2b
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000555556fe1400
R10: 0000555556fe16d0 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffe1e08c4f0
Allocated by task 3630:
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 ffff88807e379a40
which belongs to the cache net_namespace of size 6464
The buggy address is located 600 bytes inside of
6464-byte region [ffff88807e379a40, ffff88807e37b380)
The buggy address belongs to the page:
page:ffffea0001f8de00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807e379a40 pfn:0x7e378
head:ffffea0001f8de00 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88801f0180c1
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0000a17c08 ffff888011dc7288 ffff888011dc63c0
raw: ffff88807e379a40 0000000000040001 00000001ffffffff ffff88801f0180c1
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 3619, ts 162751072790, free_ts 162744989318
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:
ffff88807e379b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807e379c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807e379c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807e379d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807e379d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: b8 78 05 00 00 mov $0x578,%eax
5: 48 01 c3 add %rax,%rbx
8: 48 89 df mov %rbx,%rdi
b: be 08 00 00 00 mov $0x8,%esi
10: e8 8d fc 11 00 callq 0x11fca2
15: 48 89 d8 mov %rbx,%rax
18: 48 c1 e8 03 shr $0x3,%rax
1c: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
23: fc ff df
26: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1)
* 2a: 74 08 je 0x34 <-- trapping instruction
2c: 48 89 df mov %rbx,%rdi
2f: e8 de fa 11 00 callq 0x11fb12
34: 48 8b 1b mov (%rbx),%rbx
37: be 00 00 00 10 mov $0x10000000,%esi
3c: 48 21 de and %rbx,%rsi
3f: 31 .byte 0x31