==================================================================
BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:384 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler+0x882/0x9c0 net/ipv4/tcp_timer.c:648
Read of size 1 at addr ffff88801d8c554d by task syz-executor.1/25552
CPU: 0 PID: 25552 Comm: syz-executor.1 Not tainted 5.15.152-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
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_probe_timer net/ipv4/tcp_timer.c:384 [inline]
tcp_write_timer_handler+0x882/0x9c0 net/ipv4/tcp_timer.c:648
tcp_write_timer+0x12e/0x280 net/ipv4/tcp_timer.c:664
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:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1096
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__preempt_count_add kernel/rcu/tree.c:1119 [inline]
RIP: 0010:rcu_is_watching+0x4/0xa0 kernel/rcu/tree.c:1122
Code: 5d 41 5e 41 5f 5d c3 e8 6a d5 b0 08 41 f7 c4 00 02 00 00 75 b4 eb b3 e8 4a d5 b0 08 66 2e 0f 1f 84 00 00 00 00 00 41 57 41 56 <53> 65 ff 05 0c 7c 97 7e e8 ff e8 b0 08 89 c3 83 f8 08 73 72 49 bf
RSP: 0018:ffffc90003af72a8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 1ffff9200075ee60 RCX: ffff88807ba59dc0
RDX: dffffc0000000000 RSI: ffffffff8a8b27a0 RDI: ffffffff8ad88f00
RBP: ffffc90003af73b8 R08: dffffc0000000000 R09: fffffbfff1f79e19
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000555556174000
R13: ffffea00013bb1c0 R14: ffffea00013bb1c0 R15: ffffea00013bb1c8
rcu_read_lock include/linux/rcupdate.h:697 [inline]
lock_page_memcg+0xbd/0x4d0 mm/memcontrol.c:2044
page_remove_rmap+0x2a/0x11e0 mm/rmap.c:1351
zap_pte_range mm/memory.c:1373 [inline]
zap_pmd_range mm/memory.c:1494 [inline]
zap_pud_range mm/memory.c:1523 [inline]
zap_p4d_range mm/memory.c:1544 [inline]
unmap_page_range+0xffa/0x2630 mm/memory.c:1565
unmap_vmas+0x1f8/0x390 mm/memory.c:1642
exit_mmap+0x3b6/0x670 mm/mmap.c:3186
__mmput+0x112/0x3b0 kernel/fork.c:1126
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:867
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: 0033:0x7f4ed4ed6da9
Code: Unable to access opcode bytes at RIP 0x7f4ed4ed6d7f.
RSP: 002b:00007f4ed3457178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f4ed5004f88 RCX: 00007f4ed4ed6da9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f4ed5004f88
RBP: 00007f4ed5004f80 R08: 00007f4ed34576c0 R09: 00007f4ed34576c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4ed5004f8c
R13: 000000000000000b R14: 00007ffffff22d20 R15: 00007ffffff22e08
Allocated by task 4692:
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:3101
__do_sys_unshare kernel/fork.c:3175 [inline]
__se_sys_unshare kernel/fork.c:3173 [inline]
__x64_sys_unshare+0x34/0x40 kernel/fork.c:3173
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 ffff88801d8c4ec0
which belongs to the cache net_namespace of size 6464
The buggy address is located 1677 bytes inside of
6464-byte region [ffff88801d8c4ec0, ffff88801d8c6800)
The buggy address belongs to the page:
page:ffffea0000763000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801d8c4ec0 pfn:0x1d8c0
head:ffffea0000763000 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88802193e101
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001cd9600 0000000200000002 ffff888011dea3c0
raw: ffff88801d8c4ec0 0000000080040001 00000001ffffffff ffff88802193e101
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 3865, ts 124128263965, free_ts 123975473279
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:3101
__do_sys_unshare kernel/fork.c:3175 [inline]
__se_sys_unshare kernel/fork.c:3173 [inline]
__x64_sys_unshare+0x34/0x40 kernel/fork.c:3173
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_slab mm/slub.c:2015 [inline]
discard_slab mm/slub.c:2021 [inline]
__unfreeze_partials+0x1b7/0x210 mm/slub.c:2507
put_cpu_partial+0x132/0x1a0 mm/slub.c:2587
do_slab_free mm/slub.c:3487 [inline]
___cache_free+0xe3/0x100 mm/slub.c:3506
qlist_free_all+0x36/0x90 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444
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
vm_area_alloc+0x20/0xe0 kernel/fork.c:349
mmap_region+0xad4/0x1670 mm/mmap.c:1771
do_mmap+0x78d/0xe00 mm/mmap.c:1575
vm_mmap_pgoff+0x1ca/0x2d0 mm/util.c:551
ksys_mmap_pgoff+0x559/0x780 mm/mmap.c:1624
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
Memory state around the buggy address:
ffff88801d8c5400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801d8c5480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801d8c5500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801d8c5580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801d8c5600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 5d pop %rbp
1: 41 5e pop %r14
3: 41 5f pop %r15
5: 5d pop %rbp
6: c3 ret
7: e8 6a d5 b0 08 call 0x8b0d576
c: 41 f7 c4 00 02 00 00 test $0x200,%r12d
13: 75 b4 jne 0xffffffc9
15: eb b3 jmp 0xffffffca
17: e8 4a d5 b0 08 call 0x8b0d566
1c: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
23: 00 00 00
26: 41 57 push %r15
28: 41 56 push %r14
* 2a: 53 push %rbx <-- trapping instruction
2b: 65 ff 05 0c 7c 97 7e incl %gs:0x7e977c0c(%rip) # 0x7e977c3e
32: e8 ff e8 b0 08 call 0x8b0e936
37: 89 c3 mov %eax,%ebx
39: 83 f8 08 cmp $0x8,%eax
3c: 73 72 jae 0xb0
3e: 49 rex.WB
3f: bf .byte 0xbf