==================================================================
BUG: KASAN: slab-use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
BUG: KASAN: slab-use-after-free in do_raw_spin_lock+0x23b/0x260 kernel/locking/spinlock_debug.c:115
Read of size 4 at addr ffff888037399004 by task udevd/5143
CPU: 3 UID: 0 PID: 5143 Comm: udevd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0x13d/0x4b0 mm/kasan/report.c:482
kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
do_raw_spin_lock+0x23b/0x260 kernel/locking/spinlock_debug.c:115
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock_irqsave+0x42/0x60 kernel/locking/spinlock.c:166
p9_tag_remove net/9p/client.c:274 [inline]
p9_req_put net/9p/client.c:282 [inline]
p9_req_put+0xaf/0x250 net/9p/client.c:279
req_done+0x1dc/0x2e0 net/9p/trans_virtio.c:147
vring_interrupt+0x2ef/0x660 drivers/virtio/virtio_ring.c:3297
__handle_irq_event_percpu+0x232/0x880 kernel/irq/handle.c:209
handle_irq_event_percpu kernel/irq/handle.c:246 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:263
handle_edge_irq+0x34c/0x950 kernel/irq/chip.c:859
generic_handle_irq_desc include/linux/irqdesc.h:188 [inline]
handle_irq arch/x86/kernel/irq.c:209 [inline]
call_irq_handler arch/x86/kernel/irq.c:265 [inline]
__common_interrupt+0xd8/0x2f0 arch/x86/kernel/irq.c:280
common_interrupt+0x60/0xe0 arch/x86/kernel/irq.c:273
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:665
RIP: 0010:handle_softirqs+0x1ad/0x9b0 kernel/softirq.c:608
Code: 20 44 88 74 24 1e 45 89 ee 48 c7 c7 80 7a ad 8b e8 18 f4 ce 09 31 d2 65 66 89 15 d6 b8 48 12 e8 39 c6 49 00 fb bb ff ff ff ff <49> c7 c4 c0 a0 40 8e 41 0f bc de 83 c3 01 0f 85 a4 00 00 00 e9 1b
RSP: 0018:ffffc900006f8f28 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 00000000ffffffff RCX: ffffffff8211ac5f
RDX: 0000000000000000 RSI: ffffffff8c1e6100 RDI: ffffffff81c7e767
RBP: 00000001000034b7 R08: 0000000000000000 R09: fffffbfff21b45d2
R10: 0000000000000000 R11: ffffc900006f8ff8 R12: 000000000000000a
R13: 0000000000000004 R14: 0000000000000004 R15: 1ffff920000df1ec
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x162/0x210 kernel/softirq.c:735
irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__sanitizer_cov_trace_pc+0x2a/0x70 kernel/kcov.c:235
Code: f3 0f 1e fa 65 8b 05 05 41 07 12 48 8b 34 24 65 48 8b 15 e1 40 07 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 00 ff 00 74 05 51 a2 90 09 8b 82 24 17 00 00 85 c0 74 f1 8b 82 f8 16 00 00 83
RSP: 0018:ffffc900035474b0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff888026642988 RCX: ffffc900035477d8
RDX: ffff88802b8a0000 RSI: ffffffff84b9bccb RDI: ffff888026642988
RBP: ffffc90003547640 R08: 0000000000000002 R09: 000000000000041d
R10: 0000000000000409 R11: 0000000000000001 R12: ffffc90003547948
R13: 0000000000000600 R14: ffffc90003547948 R15: ffffc90003547640
avtab_search_node+0x2b/0x490 security/selinux/ss/avtab.c:151
cond_compute_av+0x5f/0x350 security/selinux/ss/conditional.c:591
context_struct_compute_av+0x81f/0x1250 security/selinux/ss/services.c:677
security_compute_av+0x5ea/0x11e0 security/selinux/ss/services.c:1178
avc_compute_av+0x84/0x820 security/selinux/avc.c:992
avc_perm_nonode+0xb1/0x180 security/selinux/avc.c:1117
avc_has_perm_noaudit+0x2d4/0x3b0 security/selinux/avc.c:1160
selinux_inode_permission+0x8d4/0x1130 security/selinux/hooks.c:3280
security_inode_permission+0xda/0x250 security/security.c:1842
inode_permission+0x36c/0x620 fs/namei.c:661
may_open+0x2b8/0x480 fs/namei.c:4274
do_open fs/namei.c:4698 [inline]
path_openat+0x8da/0x4280 fs/namei.c:4859
do_file_open+0x20e/0x430 fs/namei.c:4888
do_sys_openat2+0x10f/0x1e0 fs/open.c:1395
do_sys_open fs/open.c:1401 [inline]
__do_sys_openat fs/open.c:1417 [inline]
__se_sys_openat fs/open.c:1412 [inline]
__x64_sys_openat+0x12d/0x210 fs/open.c:1412
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6e8aea7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffc0beee160 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f6e8b580880 RCX: 00007f6e8aea7407
RDX: 0000000000080141 RSI: 0000564328c8602e RDI: ffffffffffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000001a4 R11: 0000000000000202 R12: 00000000ffffffff
R13: 00000000ffffffff R14: ffffffffffffffff R15: 00007ffc0beee480
Allocated by task 24042:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
_kmalloc_noprof include/linux/slab.h:969 [inline]
p9_client_create+0xaf/0xd40 net/9p/client.c:864
v9fs_session_init+0x3c/0xdd0 fs/9p/v9fs.c:471
v9fs_get_tree+0xb8/0xb50 fs/9p/vfs_super.c:97
vfs_get_tree+0x92/0x320 fs/super.c:1694
fc_mount fs/namespace.c:1198 [inline]
do_new_mount_fc fs/namespace.c:3765 [inline]
do_new_mount fs/namespace.c:3841 [inline]
path_mount+0x7d0/0x23d0 fs/namespace.c:4161
do_mount fs/namespace.c:4174 [inline]
__do_sys_mount fs/namespace.c:4390 [inline]
__se_sys_mount fs/namespace.c:4367 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4367
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 24042:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2700 [inline]
slab_free mm/slub.c:6310 [inline]
kfree+0x22b/0x6c0 mm/slub.c:6625
p9_client_create+0x72d/0xd40 net/9p/client.c:943
v9fs_session_init+0x3c/0xdd0 fs/9p/v9fs.c:471
v9fs_get_tree+0xb8/0xb50 fs/9p/vfs_super.c:97
vfs_get_tree+0x92/0x320 fs/super.c:1694
fc_mount fs/namespace.c:1198 [inline]
do_new_mount_fc fs/namespace.c:3765 [inline]
do_new_mount fs/namespace.c:3841 [inline]
path_mount+0x7d0/0x23d0 fs/namespace.c:4161
do_mount fs/namespace.c:4174 [inline]
__do_sys_mount fs/namespace.c:4390 [inline]
__se_sys_mount fs/namespace.c:4367 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4367
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888037399000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 4 bytes inside of
freed 512-byte region [ffff888037399000, ffff888037399200)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x37398
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b842c80 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b842c80 dead000000000100 dead000000000122
head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 22693, tgid 22693 (syz-executor), ts 414022627116, free_ts 413307180413
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
prep_new_page mm/page_alloc.c:1867 [inline]
get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
__alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
alloc_slab_page mm/slub.c:3289 [inline]
allocate_slab mm/slub.c:3404 [inline]
new_slab+0xa2/0x670 mm/slub.c:3447
refill_objects+0xe3/0x430 mm/slub.c:7241
refill_sheaf mm/slub.c:2827 [inline]
__pcs_replace_empty_main+0x375/0x660 mm/slub.c:4692
alloc_from_pcs mm/slub.c:4790 [inline]
slab_alloc_node mm/slub.c:4924 [inline]
__kmalloc_cache_noprof+0x48d/0x6e0 mm/slub.c:5446
_kmalloc_noprof include/linux/slab.h:969 [inline]
_kzalloc_noprof include/linux/slab.h:1286 [inline]
device_private_init drivers/base/core.c:3602 [inline]
device_add+0xd3f/0x1970 drivers/base/core.c:3653
netdev_register_kobject+0x1a9/0x3d0 net/core/net-sysfs.c:2337
register_netdevice+0x15b6/0x25a0 net/core/dev.c:11439
virt_wifi_newlink+0x3ec/0x840 drivers/net/wireless/virtual/virt_wifi.c:572
rtnl_newlink_create net/core/rtnetlink.c:3905 [inline]
__rtnl_newlink net/core/rtnetlink.c:4036 [inline]
rtnl_newlink+0x1499/0x2380 net/core/rtnetlink.c:4151
rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:7068
netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2556
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1900
page last free pid 5827 tgid 5827 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1406 [inline]
__free_frozen_pages+0x79f/0x1090 mm/page_alloc.c:2950
kasan_depopulate_vmalloc_pte+0x5d/0x80 mm/kasan/shadow.c:484
apply_to_pte_range mm/memory.c:3338 [inline]
apply_to_pmd_range mm/memory.c:3382 [inline]
apply_to_pud_range mm/memory.c:3418 [inline]
apply_to_p4d_range mm/memory.c:3454 [inline]
__apply_to_page_range+0xb1d/0x1520 mm/memory.c:3490
__kasan_release_vmalloc+0xd7/0xe0 mm/kasan/shadow.c:602
kasan_release_vmalloc include/linux/kasan.h:593 [inline]
kasan_release_vmalloc_node mm/vmalloc.c:2284 [inline]
purge_vmap_node+0x210/0xb40 mm/vmalloc.c:2306
__purge_vmap_area_lazy+0x90a/0xc00 mm/vmalloc.c:2396
drain_vmap_area_work+0x27/0x40 mm/vmalloc.c:2430
process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
process_scheduled_works kernel/workqueue.c:3405 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff888037398f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888037398f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888037399000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888037399080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888037399100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 20 44 88 74 and %al,0x74(%rax,%rcx,4)
4: 24 1e and $0x1e,%al
6: 45 89 ee mov %r13d,%r14d
9: 48 c7 c7 80 7a ad 8b mov $0xffffffff8bad7a80,%rdi
10: e8 18 f4 ce 09 call 0x9cef42d
15: 31 d2 xor %edx,%edx
17: 65 66 89 15 d6 b8 48 mov %dx,%gs:0x1248b8d6(%rip) # 0x1248b8f5
1e: 12
1f: e8 39 c6 49 00 call 0x49c65d
24: fb sti
25: bb ff ff ff ff mov $0xffffffff,%ebx
* 2a: 49 c7 c4 c0 a0 40 8e mov $0xffffffff8e40a0c0,%r12 <-- trapping instruction
31: 41 0f bc de bsf %r14d,%ebx
35: 83 c3 01 add $0x1,%ebx
38: 0f 85 a4 00 00 00 jne 0xe2
3e: e9 .byte 0xe9
3f: 1b .byte 0x1b