syzbot


KASAN: slab-use-after-free Read in hci_disconnect

Status: moderation: reported on 2024/01/10 02:39
Subsystems: bluetooth
[Documentation on labels]
Reported-by: syzbot+77f227635f1d0b7d5102@syzkaller.appspotmail.com
First crash: 108d, last: 3d21h

Sample crash report:
Bluetooth: hci2: link tx timeout
Bluetooth: hci2: killing stalled connection 11:aa:aa:aa:aa:aa
==================================================================
BUG: KASAN: slab-use-after-free in hci_disconnect+0x208/0x2d0 net/bluetooth/hci_conn.c:190
Read of size 1 at addr ffff888063da4039 by task kworker/u9:0/12299

CPU: 0 PID: 12299 Comm: kworker/u9:0 Not tainted 6.9.0-rc4-syzkaller-00173-g3cdb45594619 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: hci2 hci_tx_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 hci_disconnect+0x208/0x2d0 net/bluetooth/hci_conn.c:190
 hci_link_tx_to net/bluetooth/hci_core.c:3495 [inline]
 __check_timeout+0x3a8/0x560 net/bluetooth/hci_core.c:3642
 hci_sched_le net/bluetooth/hci_core.c:3825 [inline]
 hci_tx_work+0x139b/0x1ef0 net/bluetooth/hci_core.c:3903
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0xa10/0x17c0 kernel/workqueue.c:3335
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Allocated by task 5092:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 kmalloc_trace+0x1db/0x360 mm/slub.c:3997
 kmalloc include/linux/slab.h:628 [inline]
 kzalloc include/linux/slab.h:749 [inline]
 hci_conn_add+0xc7/0x13a0 net/bluetooth/hci_conn.c:914
 le_conn_complete_evt+0x303/0x12f0 net/bluetooth/hci_event.c:5771
 hci_le_conn_complete_evt+0x18c/0x420 net/bluetooth/hci_event.c:5923
 hci_event_func net/bluetooth/hci_event.c:7539 [inline]
 hci_event_packet+0xa53/0x1540 net/bluetooth/hci_event.c:7594
 hci_rx_work+0x3e8/0xca0 net/bluetooth/hci_core.c:4171
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0xa10/0x17c0 kernel/workqueue.c:3335
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Freed by task 5092:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240
 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2106 [inline]
 slab_free mm/slub.c:4280 [inline]
 kfree+0x153/0x3a0 mm/slub.c:4390
 device_release+0x99/0x1c0
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x22f/0x480 lib/kobject.c:737
 hci_conn_cleanup net/bluetooth/hci_conn.c:176 [inline]
 hci_conn_del+0x900/0xc80 net/bluetooth/hci_conn.c:1126
 hci_abort_conn_sync+0x583/0xde0 net/bluetooth/hci_sync.c:5567
 hci_cmd_sync_work+0x22b/0x400 net/bluetooth/hci_sync.c:310
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0xa10/0x17c0 kernel/workqueue.c:3335
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

The buggy address belongs to the object at ffff888063da4000
 which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 57 bytes inside of
 freed 8192-byte region [ffff888063da4000, ffff888063da6000)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x63da0
head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff80000000840(slab|head|node=0|zone=1|lastcpupid=0xfff)
page_type: 0xffffffff()
raw: 00fff80000000840 ffff888015042280 ffffea00007cae00 dead000000000002
raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000
head: 00fff80000000840 ffff888015042280 ffffea00007cae00 dead000000000002
head: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000
head: 00fff80000000003 ffffea00018f6801 dead000000000122 00000000ffffffff
head: 0000000800000000 0000000000000000 00000000ffffffff 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 7154, tgid 1104498093 (syz-executor.2), ts 7154, free_ts 172893134475
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1534
 prep_new_page mm/page_alloc.c:1541 [inline]
 get_page_from_freelist+0x3410/0x35b0 mm/page_alloc.c:3317
 __alloc_pages+0x256/0x6c0 mm/page_alloc.c:4575
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page+0x5f/0x160 mm/slub.c:2175
 allocate_slab mm/slub.c:2338 [inline]
 new_slab+0x84/0x2f0 mm/slub.c:2391
 ___slab_alloc+0xc73/0x1260 mm/slub.c:3525
 __slab_alloc mm/slub.c:3610 [inline]
 __slab_alloc_node mm/slub.c:3663 [inline]
 slab_alloc_node mm/slub.c:3835 [inline]
 __do_kmalloc_node mm/slub.c:3965 [inline]
 __kmalloc_node+0x2db/0x4e0 mm/slub.c:3973
 kmalloc_node include/linux/slab.h:648 [inline]
 kvmalloc_node+0x72/0x190 mm/util.c:634
 kvmalloc include/linux/slab.h:766 [inline]
 kvmalloc_array include/linux/slab.h:784 [inline]
 __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:471 [inline]
 ptr_ring_init include/linux/ptr_ring.h:489 [inline]
 skb_array_init include/linux/skb_array.h:182 [inline]
 pfifo_fast_init+0x389/0x6e0 net/sched/sch_generic.c:860
 qdisc_create_dflt+0x136/0x4b0 net/sched/sch_generic.c:1007
 attach_one_default_qdisc net/sched/sch_generic.c:1165 [inline]
 netdev_for_each_tx_queue include/linux/netdevice.h:2500 [inline]
 attach_default_qdiscs net/sched/sch_generic.c:1183 [inline]
 dev_activate+0x3c0/0x1240 net/sched/sch_generic.c:1242
 __dev_open+0x352/0x450 net/core/dev.c:1439
 __dev_change_flags+0x1e2/0x6f0 net/core/dev.c:8692
 dev_change_flags+0x8b/0x1a0 net/core/dev.c:8764
 do_setlink+0xccd/0x41f0 net/core/rtnetlink.c:2884
 __rtnl_newlink net/core/rtnetlink.c:3680 [inline]
 rtnl_newlink+0x180b/0x20a0 net/core/rtnetlink.c:3727
page last free pid 5421 tgid 5421 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1141 [inline]
 free_unref_page_prepare+0x97b/0xaa0 mm/page_alloc.c:2347
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2487
 discard_slab mm/slub.c:2437 [inline]
 __put_partials+0xeb/0x130 mm/slub.c:2906
 put_cpu_partial+0x17c/0x250 mm/slub.c:2981
 __slab_free+0x2ea/0x3d0 mm/slub.c:4151
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x5e/0xc0 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3798 [inline]
 slab_alloc_node mm/slub.c:3845 [inline]
 __do_kmalloc_node mm/slub.c:3965 [inline]
 __kmalloc+0x1e2/0x4a0 mm/slub.c:3979
 kmalloc include/linux/slab.h:632 [inline]
 tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_number_perm+0x23a/0x880 security/tomoyo/file.c:723
 security_file_ioctl+0x75/0xb0 security/security.c:2764
 __do_sys_ioctl fs/ioctl.c:898 [inline]
 __se_sys_ioctl+0x47/0x170 fs/ioctl.c:890
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888063da3f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888063da3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888063da4000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff888063da4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888063da4100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/20 02:31 upstream 3cdb45594619 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-use-after-free Read in hci_disconnect
2024/03/31 23:23 upstream fe46a7dd189e 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-use-after-free Read in hci_disconnect
2024/02/18 13:57 upstream c02197fc9076 578f7538 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-use-after-free Read in hci_disconnect
2024/01/06 02:29 linux-next e2425464bc87 d0304e9c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-use-after-free Read in hci_disconnect
* Struck through repros no longer work on HEAD.