==================================================================
BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:906 [inline]
BUG: KASAN: use-after-free in hlist_del_init_rcu include/linux/rculist.h:184 [inline]
BUG: KASAN: use-after-free in __xfrm_state_delete+0x3db/0x940 net/xfrm/xfrm_state.c:700
Write of size 8 at addr ffff88807dc19268 by task syz.3.465/6385
CPU: 0 PID: 6385 Comm: syz.3.465 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
print_address_description mm/kasan/report.c:316 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:420
kasan_report+0x10b/0x140 mm/kasan/report.c:524
__hlist_del include/linux/list.h:906 [inline]
hlist_del_init_rcu include/linux/rculist.h:184 [inline]
__xfrm_state_delete+0x3db/0x940 net/xfrm/xfrm_state.c:700
xfrm_timer_handler+0x10b/0x970 net/xfrm/xfrm_state.c:631
__run_hrtimer kernel/time/hrtimer.c:1751 [inline]
__hrtimer_run_queues+0x522/0xc90 kernel/time/hrtimer.c:1815
hrtimer_run_softirq+0x173/0x290 kernel/time/hrtimer.c:1832
handle_softirqs+0x291/0x910 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:194
Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 9f 64 17 f7 65 8b 05 30 01 c1 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0000:ffffc900038e6d20 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a06 RCX: ef1f1bc5e5546400
RDX: dffffc0000000000 RSI: ffffffff8aac1cc0 RDI: 0000000000000001
RBP: ffffc900038e6db0 R08: ffffffff91b62287 R09: 1ffffffff236c450
R10: dffffc0000000000 R11: fffffbfff236c451 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88807944a050 R15: 1ffff9200071cda4
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
unlock_page_lruvec_irqrestore include/linux/memcontrol.h:1611 [inline]
folio_batch_move_lru+0x524/0x690 mm/swap.c:244
folio_add_lru+0x412/0xcf0 mm/swap.c:526
shmem_get_folio_gfp+0x1750/0x35e0 mm/shmem.c:1985
shmem_get_folio mm/shmem.c:2081 [inline]
shmem_write_begin+0xee/0x3f0 mm/shmem.c:2565
generic_perform_write+0x2fa/0x5c0 mm/filemap.c:3862
__generic_file_write_iter+0x148/0x2a0 mm/filemap.c:3960
generic_file_write_iter+0xab/0x2e0 mm/filemap.c:3989
__kernel_write_iter+0x298/0x690 fs/read_write.c:517
dump_emit_page fs/coredump.c:950 [inline]
dump_user_range+0x374/0x7b0 fs/coredump.c:977
elf_core_dump+0x30ca/0x3630 fs/binfmt_elf.c:2354
do_coredump+0x1702/0x25c0 fs/coredump.c:824
get_signal+0x1093/0x1340 kernel/signal.c:2870
arch_do_signal_or_restart+0xc4/0x1310 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:213
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:319
exc_page_fault+0x88/0x100 arch/x86/mm/fault.c:1485
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f56f319f561
Code: 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 48 3d 01 f0 ff ff 73 01 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f56f3425fa0 RCX: 00007f56f319f559
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007f56f3236b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f56f3426038 R14: 00007f56f3425fa0 R15: 00007ffe78c03c38
Allocated by task 4348:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
____kasan_kmalloc mm/kasan/common.c:375 [inline]
__kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slab_common.c:936 [inline]
__kmalloc+0xb3/0x240 mm/slab_common.c:949
xfrm_hash_resize+0x84/0xff0 net/xfrm/xfrm_state.c:156
process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Freed by task 3603:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516
____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1735 [inline]
slab_free_freelist_hook+0x133/0x1b0 mm/slub.c:1761
slab_free mm/slub.c:3694 [inline]
__kmem_cache_free+0xb6/0x200 mm/slub.c:3707
xfrm_hash_resize+0xdce/0xff0 net/xfrm/xfrm_state.c:198
process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
The buggy address belongs to the object at ffff88807dc19000
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 616 bytes inside of
1024-byte region [ffff88807dc19000, ffff88807dc19400)
The buggy address belongs to the physical page:
page:ffffea0001f70600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807dc1f800 pfn:0x7dc18
head:ffffea0001f70600 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0000c86c08 ffffea00015ad008 ffff888018441dc0
raw: ffff88807dc1f800 000000000010000f 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 4101, tgid 4101 (dhcpcd-run-hook), ts 62412966898, free_ts 62406456497
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560
prep_new_page mm/page_alloc.c:2567 [inline]
get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358
__alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658
alloc_slab_page+0x5d/0x180 mm/slub.c:1805
allocate_slab mm/slub.c:1950 [inline]
new_slab+0x87/0x2d0 mm/slub.c:2003
___slab_alloc+0xbc5/0x1240 mm/slub.c:3161
__slab_alloc mm/slub.c:3247 [inline]
slab_alloc_node mm/slub.c:3332 [inline]
__kmem_cache_alloc_node+0x126/0x270 mm/slub.c:3405
__do_kmalloc_node mm/slab_common.c:935 [inline]
__kmalloc+0xa3/0x240 mm/slab_common.c:949
kmalloc include/linux/slab.h:568 [inline]
load_elf_phdrs fs/binfmt_elf.c:507 [inline]
load_elf_binary+0x26e/0x2820 fs/binfmt_elf.c:887
search_binary_handler fs/exec.c:1777 [inline]
exec_binprm fs/exec.c:1818 [inline]
bprm_execve+0xaf7/0x17e0 fs/exec.c:1887
do_execveat_common+0x501/0x6b0 fs/exec.c:1992
do_execve fs/exec.c:2066 [inline]
__do_sys_execve fs/exec.c:2142 [inline]
__se_sys_execve fs/exec.c:2137 [inline]
__x64_sys_execve+0x8e/0xa0 fs/exec.c:2137
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1487 [inline]
free_pcp_prepare mm/page_alloc.c:1537 [inline]
free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414
free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509
free_slab mm/slub.c:2042 [inline]
discard_slab mm/slub.c:2048 [inline]
__unfreeze_partials+0x188/0x1e0 mm/slub.c:2598
put_cpu_partial+0x17c/0x250 mm/slub.c:2674
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook+0x4b/0x490 mm/slab.h:742
slab_alloc_node mm/slub.c:3366 [inline]
__kmem_cache_alloc_node+0x19d/0x270 mm/slub.c:3405
kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026
kmalloc include/linux/slab.h:563 [inline]
kzalloc include/linux/slab.h:699 [inline]
tomoyo_print_bprm security/tomoyo/audit.c:26 [inline]
tomoyo_init_log+0x10a3/0x1f90 security/tomoyo/audit.c:264
tomoyo_supervisor+0x361/0x11b0 security/tomoyo/common.c:2088
tomoyo_audit_env_log security/tomoyo/environ.c:36 [inline]
tomoyo_env_perm+0x14e/0x1f0 security/tomoyo/environ.c:63
tomoyo_environ security/tomoyo/domain.c:672 [inline]
tomoyo_find_next_domain+0x12dd/0x1a30 security/tomoyo/domain.c:882
tomoyo_bprm_check_security+0x100/0x150 security/tomoyo/tomoyo.c:101
security_bprm_check+0x5e/0x90 security/security.c:873
Memory state around the buggy address:
ffff88807dc19100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807dc19180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807dc19200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807dc19280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807dc19300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: c7 44 24 20 00 00 00 movl $0x0,0x20(%rsp)
7: 00
8: 9c pushf
9: 8f 44 24 20 pop 0x20(%rsp)
d: f7 44 24 20 00 02 00 testl $0x200,0x20(%rsp)
14: 00
15: 41 c6 04 07 f8 movb $0xf8,(%r15,%rax,1)
1a: 75 4b jne 0x67
1c: f7 c3 00 02 00 00 test $0x200,%ebx
22: 74 01 je 0x25
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 9f 64 17 f7 call 0xf71764ce <-- trapping instruction
2f: 65 8b 05 30 01 c1 75 mov %gs:0x75c10130(%rip),%eax # 0x75c10166
36: 85 c0 test %eax,%eax
38: 74 3c je 0x76
3a: 48 rex.W
3b: c7 .byte 0xc7
3c: 04 24 add $0x24,%al
3e: 0e (bad)
3f: 36 ss