Re: [syzbot] [kernel?] KASAN: slab-use-after-free Write in binder_add_device

[syzbot <syzbot+810b8555076779a07399@syzkaller.appspotmail.com>]

> #syz upstream

Can't upstream, this is final destination.

>
> On Sun, Mar 16, 2025 at 6:51 PM syzbot
> <syzbot+810b8555076779a07399@syzkaller.appspotmail.com> wrote:
>>
>> Hello,
>>
>> syzbot found the following issue on:
>>
>> HEAD commit:    b7f94fcf5546 Merge tag 'sched_ext-for-6.14-rc6-fixes' of g..
>> git tree:       upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=134f303f980000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=cdc24cb631dc9bc4
>> dashboard link: https://syzkaller.appspot.com/bug?extid=810b8555076779a07399
>> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
>>
>> Unfortunately, I don't have any reproducer for this issue yet.
>>
>> Downloadable assets:
>> disk image: https://storage.googleapis.com/syzbot-assets/532c57952c57/disk-b7f94fcf.raw.xz
>> vmlinux: https://storage.googleapis.com/syzbot-assets/38b172b182bb/vmlinux-b7f94fcf.xz
>> kernel image: https://storage.googleapis.com/syzbot-assets/516117ec1173/bzImage-b7f94fcf.xz
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+810b8555076779a07399@syzkaller.appspotmail.com
>>
>> ==================================================================
>> BUG: KASAN: slab-use-after-free in hlist_add_head include/linux/list.h:1026 [inline]
>> BUG: KASAN: slab-use-after-free in binder_add_device+0xa4/0xb0 drivers/android/binder.c:6932
>> Write of size 8 at addr ffff88805b2f1408 by task syz-executor/20732
>>
>> CPU: 0 UID: 0 PID: 20732 Comm: syz-executor Not tainted 6.14.0-rc6-syzkaller-00022-gb7f94fcf5546 #0
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
>> Call Trace:
>>  <TASK>
>>  __dump_stack lib/dump_stack.c:94 [inline]
>>  dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
>>  print_address_description mm/kasan/report.c:408 [inline]
>>  print_report+0xc3/0x670 mm/kasan/report.c:521
>>  kasan_report+0xd9/0x110 mm/kasan/report.c:634
>>  hlist_add_head include/linux/list.h:1026 [inline]
>>  binder_add_device+0xa4/0xb0 drivers/android/binder.c:6932
>>  binderfs_binder_device_create.isra.0+0x95f/0xb70 drivers/android/binderfs.c:210
>>  binderfs_fill_super+0x8d6/0x1360 drivers/android/binderfs.c:730
>>  vfs_get_super fs/super.c:1280 [inline]
>>  get_tree_nodev+0xda/0x190 fs/super.c:1299
>>  vfs_get_tree+0x8b/0x340 fs/super.c:1814
>>  do_new_mount fs/namespace.c:3560 [inline]
>>  path_mount+0x14e6/0x1f10 fs/namespace.c:3887
>>  do_mount fs/namespace.c:3900 [inline]
>>  __do_sys_mount fs/namespace.c:4111 [inline]
>>  __se_sys_mount fs/namespace.c:4088 [inline]
>>  __x64_sys_mount+0x28f/0x310 fs/namespace.c:4088
>>  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>>  do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
>>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
>> RIP: 0033:0x7f102658e90a
>> Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
>> RSP: 002b:00007ffe8e459a48 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
>> RAX: ffffffffffffffda RBX: 00007f102660e663 RCX: 00007f102658e90a
>> RDX: 00007f102661dda7 RSI: 00007f102660e663 RDI: 00007f102661dda7
>> RBP: 00007f102660e8ac R08: 0000000000000000 R09: 00007f10267a6738
>> R10: 0000000000000000 R11: 0000000000000246 R12: 00007f10265eb1a8
>> R13: 00007f10265eb180 R14: 0000000000000009 R15: 0000000000000000
>>  </TASK>
>>
>> Allocated by task 6747:
>>  kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
>>  kasan_save_track+0x14/0x30 mm/kasan/common.c:68
>>  poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
>>  __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
>>  kmalloc_noprof include/linux/slab.h:901 [inline]
>>  batadv_forw_packet_alloc+0x3ac/0x4e0 net/batman-adv/send.c:519
>>  batadv_iv_ogm_aggregate_new+0x132/0x4a0 net/batman-adv/bat_iv_ogm.c:562
>>  batadv_iv_ogm_queue_add net/batman-adv/bat_iv_ogm.c:670 [inline]
>>  batadv_iv_ogm_schedule_buff+0xe6d/0x14d0 net/batman-adv/bat_iv_ogm.c:849
>>  batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:868 [inline]
>>  batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:861 [inline]
>>  batadv_iv_send_outstanding_bat_ogm_packet+0x31e/0x8d0 net/batman-adv/bat_iv_ogm.c:1712
>>  process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238
>>  process_scheduled_works kernel/workqueue.c:3319 [inline]
>>  worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400
>>  kthread+0x3af/0x750 kernel/kthread.c:464
>>  ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
>>  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
>>
>> Freed by task 10272:
>>  kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
>>  kasan_save_track+0x14/0x30 mm/kasan/common.c:68
>>  kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
>>  poison_slab_object mm/kasan/common.c:247 [inline]
>>  __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
>>  kasan_slab_free include/linux/kasan.h:233 [inline]
>>  slab_free_hook mm/slub.c:2353 [inline]
>>  slab_free mm/slub.c:4609 [inline]
>>  kfree+0x2c4/0x4d0 mm/slub.c:4757
>>  batadv_iv_send_outstanding_bat_ogm_packet+0x262/0x8d0 net/batman-adv/bat_iv_ogm.c:1718
>>  process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238
>>  process_scheduled_works kernel/workqueue.c:3319 [inline]
>>  worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400
>>  kthread+0x3af/0x750 kernel/kthread.c:464
>>  ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
>>  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
>>
>> Last potentially related work creation:
>>  kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
>>  kasan_record_aux_stack+0xb8/0xd0 mm/kasan/generic.c:548
>>  insert_work+0x36/0x230 kernel/workqueue.c:2183
>>  __queue_work+0x3f8/0x10f0 kernel/workqueue.c:2345
>>  call_timer_fn+0x1a0/0x610 kernel/time/timer.c:1789
>>  expire_timers kernel/time/timer.c:1835 [inline]
>>  __run_timers+0x56a/0x930 kernel/time/timer.c:2414
>>  __run_timer_base kernel/time/timer.c:2426 [inline]
>>  __run_timer_base kernel/time/timer.c:2418 [inline]
>>  run_timer_base+0x114/0x190 kernel/time/timer.c:2435
>>  run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2445
>>  handle_softirqs+0x213/0x8f0 kernel/softirq.c:561
>>  __do_softirq kernel/softirq.c:595 [inline]
>>  invoke_softirq kernel/softirq.c:435 [inline]
>>  __irq_exit_rcu+0x109/0x170 kernel/softirq.c:662
>>  irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
>>  instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
>>  sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
>>  asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
>>
>> The buggy address belongs to the object at ffff88805b2f1400
>>  which belongs to the cache kmalloc-512 of size 512
>> The buggy address is located 8 bytes inside of
>>  freed 512-byte region [ffff88805b2f1400, ffff88805b2f1600)
>>
>> The buggy address belongs to the physical page:
>> page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805b2f1000 pfn:0x5b2f0
>> head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
>> flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
>> page_type: f5(slab)
>> raw: 00fff00000000240 ffff88801b041c80 ffffea0000c12c10 ffffea000093fd10
>> raw: ffff88805b2f1000 000000000010000a 00000000f5000000 0000000000000000
>> head: 00fff00000000240 ffff88801b041c80 ffffea0000c12c10 ffffea000093fd10
>> head: ffff88805b2f1000 000000000010000a 00000000f5000000 0000000000000000
>> head: 00fff00000000002 ffffea00016cbc01 ffffffffffffffff 0000000000000000
>> head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000
>> page dumped because: kasan: bad access detected
>> page_owner tracks the page as allocated
>> page last allocated via order 2, migratetype Unmovable, gfp_mask 0x152820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 12181, tgid 12181 (syz-executor), ts 725842820442, free_ts 725318767702
>>  set_page_owner include/linux/page_owner.h:32 [inline]
>>  post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1551
>>  prep_new_page mm/page_alloc.c:1559 [inline]
>>  get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3477
>>  __alloc_frozen_pages_noprof+0x221/0x2470 mm/page_alloc.c:4740
>>  alloc_pages_mpol+0x1fc/0x540 mm/mempolicy.c:2270
>>  alloc_slab_page mm/slub.c:2423 [inline]
>>  allocate_slab mm/slub.c:2587 [inline]
>>  new_slab+0x23d/0x330 mm/slub.c:2640
>>  ___slab_alloc+0xc5d/0x1720 mm/slub.c:3826
>>  __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3916
>>  __slab_alloc_node mm/slub.c:3991 [inline]
>>  slab_alloc_node mm/slub.c:4152 [inline]
>>  __do_kmalloc_node mm/slub.c:4293 [inline]
>>  __kmalloc_noprof+0x2ec/0x510 mm/slub.c:4306
>>  kmalloc_noprof include/linux/slab.h:905 [inline]
>>  kzalloc_noprof include/linux/slab.h:1037 [inline]
>>  fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155
>>  ip6_route_info_create+0x337/0x1910 net/ipv6/route.c:3766
>>  ip6_route_add+0x26/0x1c0 net/ipv6/route.c:3858
>>  addrconf_prefix_route+0x2fe/0x510 net/ipv6/addrconf.c:2485
>>  addrconf_add_linklocal+0x32a/0x620 net/ipv6/addrconf.c:3310
>>  addrconf_addr_gen+0x36f/0x3c0 net/ipv6/addrconf.c:3439
>>  addrconf_dev_config net/ipv6/addrconf.c:3485 [inline]
>>  addrconf_init_auto_addrs+0x446/0x820 net/ipv6/addrconf.c:3563
>>  addrconf_notify+0xe91/0x19c0 net/ipv6/addrconf.c:3736
>> page last free pid 12513 tgid 12513 stack trace:
>>  reset_page_owner include/linux/page_owner.h:25 [inline]
>>  free_pages_prepare mm/page_alloc.c:1127 [inline]
>>  free_frozen_pages+0x6db/0xfb0 mm/page_alloc.c:2660
>>  vfree+0x174/0x950 mm/vmalloc.c:3383
>>  vb2_vmalloc_put drivers/media/common/videobuf2/videobuf2-vmalloc.c:68 [inline]
>>  vb2_vmalloc_put+0x7b/0xc0 drivers/media/common/videobuf2/videobuf2-vmalloc.c:63
>>  __vb2_buf_mem_free+0x14d/0x2b0 drivers/media/common/videobuf2/videobuf2-core.c:275
>>  __vb2_free_mem drivers/media/common/videobuf2/videobuf2-core.c:571 [inline]
>>  __vb2_queue_free+0x7dc/0xa20 drivers/media/common/videobuf2/videobuf2-core.c:599
>>  vb2_core_queue_release+0x70/0x190 drivers/media/common/videobuf2/videobuf2-core.c:2695
>>  v4l2_m2m_ctx_release+0x2a/0x40 drivers/media/v4l2-core/v4l2-mem2mem.c:1277
>>  vim2m_release+0xe2/0x170 drivers/media/test-drivers/vim2m.c:1243
>>  v4l2_release+0x232/0x460 drivers/media/v4l2-core/v4l2-dev.c:458
>>  __fput+0x3ff/0xb70 fs/file_table.c:464
>>  task_work_run+0x14e/0x250 kernel/task_work.c:227
>>  resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
>>  exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
>>  exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
>>  __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
>>  syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218
>>  do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
>>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
>>
>> Memory state around the buggy address:
>>  ffff88805b2f1300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>>  ffff88805b2f1380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>> >ffff88805b2f1400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>>                       ^
>>  ffff88805b2f1480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>>  ffff88805b2f1500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> ==================================================================
>>
>>
>> ---
>> This report is generated by a bot. It may contain errors.
>> See https://goo.gl/tpsmEJ for more information about syzbot.
>> syzbot engineers can be reached at syzkaller@googlegroups.com.
>>
>> syzbot will keep track of this issue. See:
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>>
>> If the report is already addressed, let syzbot know by replying with:
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>>
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