Message-ID: <CANp29Y4_KXDJxxB0uPKzcGjgsjXnE8XzrGOKQ-GCvriMmdORuA@mail.gmail.com>
Date: Sun, 16 Mar 2025 23:38:42 -0400
From: Aleksandr Nogikh <nogikh@...gle.com>
To: syzbot <syzbot+810b8555076779a07399@...kaller.appspotmail.com>
Cc: arve@...roid.com, brauner@...nel.org, cmllamas@...gle.com, 
	gregkh@...uxfoundation.org, joel@...lfernandes.org, 
	linux-kernel@...r.kernel.org, maco@...roid.com, surenb@...gle.com, 
	syzkaller-bugs@...glegroups.com, tkjos@...roid.com
Subject: Re: [syzbot] [kernel?] KASAN: slab-use-after-free Write in binder_add_device

#syz upstream

On Sun, Mar 16, 2025 at 6:51 PM syzbot
<syzbot+810b8555076779a07399@...kaller.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@...kaller.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@...glegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> If you want to overwrite report's subsystems, reply with:
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> (See the list of subsystem names on the web dashboard)
>
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup
>
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