==================================================================
BUG: KASAN: use-after-free in tcp_retransmit_timer+0x2ef3/0x3360 net/ipv4/tcp_timer.c:511
Read of size 8 at addr ffff88804425b9c0 by task syz-executor.4/17899
CPU: 1 PID: 17899 Comm: syz-executor.4 Not tainted 5.18.0-rc3-syzkaller-01616-g834650b50ed2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313
print_report mm/kasan/report.c:429 [inline]
kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
tcp_retransmit_timer+0x2ef3/0x3360 net/ipv4/tcp_timer.c:511
tcp_write_timer_handler+0x5e6/0xbc0 net/ipv4/tcp_timer.c:622
tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:642
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers.part.0+0x679/0xa80 kernel/time/timer.c:1737
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1750
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:__syscall_enter_from_user_work kernel/entry/common.c:89 [inline]
RIP: 0010:syscall_enter_from_user_mode+0x2b/0x70 kernel/entry/common.c:110
Code: 54 49 89 f4 55 48 89 fd 48 8b 7c 24 10 e8 ed f5 ff ff eb 27 eb 2b e8 e4 51 11 f8 e8 5f 4e 11 f8 fb 65 48 8b 04 25 00 70 02 00 <48> 8b 70 08 40 f6 c6 3f 75 19 4c 89 e0 5d 41 5c c3 eb 1b 0f 0b eb
RSP: 0018:ffffc9000f49ff28 EFLAGS: 00000202
RAX: ffff888043451d00 RBX: 0000000000000000 RCX: 1ffffffff1b72981
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000f49ff58 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817f7608 R11: 0000000000000000 R12: 0000000000000003
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
do_syscall_64+0x16/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f9de823bd2b
Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44
RSP: 002b:00007ffd461a0de0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007f9de823bd2b
RDX: ffffffffffffffb8 RSI: ffffffffffffffff RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f9de83a07e8
R10: 00007ffd461a0d00 R11: 0000000000000293 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffd461a0ec0
Allocated by task 10112:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:436 [inline]
__kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:749 [inline]
slab_alloc_node mm/slub.c:3217 [inline]
slab_alloc mm/slub.c:3225 [inline]
__kmem_cache_alloc_lru mm/slub.c:3232 [inline]
kmem_cache_alloc+0x204/0x3b0 mm/slub.c:3242
kmem_cache_zalloc include/linux/slab.h:704 [inline]
net_alloc net/core/net_namespace.c:403 [inline]
copy_net_ns+0x125/0x760 net/core/net_namespace.c:458
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x445/0x920 kernel/fork.c:3132
__do_sys_unshare kernel/fork.c:3203 [inline]
__se_sys_unshare kernel/fork.c:3201 [inline]
__x64_sys_unshare+0x2d/0x40 kernel/fork.c:3201
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Freed by task 662:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track+0x21/0x30 mm/kasan/common.c:45
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328
kasan_slab_free include/linux/kasan.h:200 [inline]
slab_free_hook mm/slub.c:1728 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754
slab_free mm/slub.c:3510 [inline]
kmem_cache_free+0xdd/0x5a0 mm/slub.c:3527
net_free net/core/net_namespace.c:432 [inline]
net_free net/core/net_namespace.c:428 [inline]
cleanup_net+0x8ba/0xb00 net/core/net_namespace.c:615
process_one_work+0x996/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
Last potentially related work creation:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
__kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348
insert_work+0x48/0x350 kernel/workqueue.c:1358
__queue_work+0x62e/0x1140 kernel/workqueue.c:1517
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1461 [inline]
__run_timers.part.0+0x4a3/0xa80 kernel/time/timer.c:1737
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0x152/0x1d0 kernel/time/timer.c:1752
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
The buggy address belongs to the object at ffff88804425b700
which belongs to the cache net_namespace of size 6784
The buggy address is located 704 bytes inside of
6784-byte region [ffff88804425b700, ffff88804425d180)
The buggy address belongs to the physical page:
page:ffffea0001109600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888044258000 pfn:0x44258
head:ffffea0001109600 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff888071d40001
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888010dcd3c0
raw: ffff888044258000 0000000080040001 00000001ffffffff ffff888071d40001
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5630, tgid 5629 (syz-executor.3), ts 154528951461, free_ts 154471393338
prep_new_page mm/page_alloc.c:2441 [inline]
get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4182
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5408
alloc_pages+0x1aa/0x310 mm/mempolicy.c:2272
alloc_slab_page mm/slub.c:1799 [inline]
allocate_slab+0x26c/0x3c0 mm/slub.c:1944
new_slab mm/slub.c:2004 [inline]
___slab_alloc+0x8df/0xf20 mm/slub.c:3005
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3092
slab_alloc_node mm/slub.c:3183 [inline]
slab_alloc mm/slub.c:3225 [inline]
__kmem_cache_alloc_lru mm/slub.c:3232 [inline]
kmem_cache_alloc+0x360/0x3b0 mm/slub.c:3242
kmem_cache_zalloc include/linux/slab.h:704 [inline]
net_alloc net/core/net_namespace.c:403 [inline]
copy_net_ns+0x125/0x760 net/core/net_namespace.c:458
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
copy_namespaces+0x391/0x450 kernel/nsproxy.c:178
copy_process+0x2f79/0x6fe0 kernel/fork.c:2237
kernel_clone+0xe7/0xab0 kernel/fork.c:2639
__do_sys_clone+0xc8/0x110 kernel/fork.c:2756
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1356 [inline]
free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1406
free_unref_page_prepare mm/page_alloc.c:3328 [inline]
free_unref_page+0x19/0x6a0 mm/page_alloc.c:3423
__unfreeze_partials+0x17c/0x1a0 mm/slub.c:2523
qlink_free mm/kasan/quarantine.c:157 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:749 [inline]
slab_alloc_node mm/slub.c:3217 [inline]
slab_alloc mm/slub.c:3225 [inline]
__kmalloc+0x200/0x350 mm/slub.c:4410
kmalloc include/linux/slab.h:586 [inline]
kzalloc include/linux/slab.h:714 [inline]
lsm_task_alloc security/security.c:614 [inline]
security_task_alloc+0x10b/0x250 security/security.c:1660
copy_process+0x2301/0x6fe0 kernel/fork.c:2216
kernel_clone+0xe7/0xab0 kernel/fork.c:2639
__do_sys_clone+0xc8/0x110 kernel/fork.c:2756
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Memory state around the buggy address:
ffff88804425b880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804425b900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88804425b980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88804425ba00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804425ba80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 54 push %rsp
1: 49 89 f4 mov %rsi,%r12
4: 55 push %rbp
5: 48 89 fd mov %rdi,%rbp
8: 48 8b 7c 24 10 mov 0x10(%rsp),%rdi
d: e8 ed f5 ff ff callq 0xfffff5ff
12: eb 27 jmp 0x3b
14: eb 2b jmp 0x41
16: e8 e4 51 11 f8 callq 0xf81151ff
1b: e8 5f 4e 11 f8 callq 0xf8114e7f
20: fb sti
21: 65 48 8b 04 25 00 70 mov %gs:0x27000,%rax
28: 02 00
* 2a: 48 8b 70 08 mov 0x8(%rax),%rsi <-- trapping instruction
2e: 40 f6 c6 3f test $0x3f,%sil
32: 75 19 jne 0x4d
34: 4c 89 e0 mov %r12,%rax
37: 5d pop %rbp
38: 41 5c pop %r12
3a: c3 retq
3b: eb 1b jmp 0x58
3d: 0f 0b ud2
3f: eb .byte 0xeb