================================================================== BUG: KASAN: use-after-free in get_kprobe kernel/kprobes.c:372 [inline] BUG: KASAN: use-after-free in get_optimized_kprobe+0x184/0x1c0 kernel/kprobes.c:489 Read of size 8 at addr ffff888017feb228 by task syz-executor.5/6722 CPU: 0 PID: 6722 Comm: syz-executor.5 Not tainted 5.10.109 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 print_address_description.constprop.0+0x1c/0x210 mm/kasan/report.c:385 __kasan_report mm/kasan/report.c:545 [inline] kasan_report.cold+0x37/0x7c mm/kasan/report.c:562 get_kprobe kernel/kprobes.c:372 [inline] get_optimized_kprobe+0x184/0x1c0 kernel/kprobes.c:489 __disarm_kprobe+0x80/0x120 kernel/kprobes.c:978 disarm_kprobe kernel/kprobes.c:1154 [inline] __disable_kprobe+0x235/0x350 kernel/kprobes.c:1793 disable_kprobe+0x25/0x70 kernel/kprobes.c:2299 __disable_trace_kprobe+0xef/0x180 kernel/trace/trace_kprobe.c:344 disable_trace_kprobe+0x231/0x2d0 kernel/trace/trace_kprobe.c:422 kprobe_register+0x61/0xb0 kernel/trace/trace_kprobe.c:1713 perf_trace_event_unreg.isra.0+0xb0/0x210 kernel/trace/trace_event_perf.c:162 perf_kprobe_destroy+0xc0/0x130 kernel/trace/trace_event_perf.c:294 _free_event+0x159/0xc70 kernel/events/core.c:4951 put_event kernel/events/core.c:5045 [inline] perf_event_release_kernel+0x899/0xc20 kernel/events/core.c:5160 perf_release+0x33/0x40 kernel/events/core.c:5170 __fput+0x285/0x980 fs/file_table.c:281 task_work_run+0xe2/0x1a0 kernel/task_work.c:151 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:164 [inline] exit_to_user_mode_prepare+0x155/0x160 kernel/entry/common.c:191 syscall_exit_to_user_mode+0x38/0x230 kernel/entry/common.c:266 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f71016df72b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffd4435afd0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f71016df72b RDX: ffffffffffffffbc RSI: 0000000000000081 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffd4435b0b0 Allocated by task 6745: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] alloc_aggr_kprobe+0x41/0x190 kernel/kprobes.c:822 try_to_optimize_kprobe kernel/kprobes.c:853 [inline] register_kprobe kernel/kprobes.c:1740 [inline] register_kprobe+0xb78/0x1330 kernel/kprobes.c:1682 __register_trace_kprobe kernel/trace/trace_kprobe.c:514 [inline] __register_trace_kprobe+0x262/0x2d0 kernel/trace/trace_kprobe.c:482 create_local_trace_kprobe+0x1e6/0x3b0 kernel/trace/trace_kprobe.c:1840 perf_kprobe_init+0x18c/0x280 kernel/trace/trace_event_perf.c:272 perf_kprobe_event_init+0xf8/0x1c0 kernel/events/core.c:9663 perf_try_init_event+0x130/0x570 kernel/events/core.c:11041 perf_init_event kernel/events/core.c:11093 [inline] perf_event_alloc.part.0+0xd96/0x2b30 kernel/events/core.c:11371 perf_event_alloc kernel/events/core.c:11750 [inline] __do_sys_perf_event_open+0x57c/0x2d00 kernel/events/core.c:11848 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 4590: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0x110/0x150 mm/kasan/common.c:422 slab_free_hook mm/slub.c:1542 [inline] slab_free_freelist_hook+0xa9/0x180 mm/slub.c:1576 slab_free mm/slub.c:3149 [inline] kfree+0xd7/0x380 mm/slub.c:4125 free_aggr_kprobe kernel/kprobes.c:434 [inline] do_free_cleaned_kprobes kernel/kprobes.c:586 [inline] kprobe_optimizer+0x56f/0x7e0 kernel/kprobes.c:624 process_one_work+0x9a9/0x1590 kernel/workqueue.c:2279 worker_thread+0x61d/0x1310 kernel/workqueue.c:2425 kthread+0x38f/0x470 kernel/kthread.c:313 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:296 Last call_rcu(): kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_record_aux_stack+0x9e/0xb0 mm/kasan/generic.c:346 __call_rcu kernel/rcu/tree.c:2963 [inline] call_rcu+0x8a/0xa00 kernel/rcu/tree.c:3037 neigh_parms_release net/core/neighbour.c:1675 [inline] neigh_parms_release+0x178/0x1d0 net/core/neighbour.c:1665 inetdev_destroy net/ipv4/devinet.c:325 [inline] inetdev_event+0x1007/0x1550 net/ipv4/devinet.c:1599 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xb3/0x110 kernel/notifier.c:410 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2047 call_netdevice_notifiers_extack net/core/dev.c:2059 [inline] call_netdevice_notifiers net/core/dev.c:2073 [inline] rollback_registered_many+0x83d/0x1270 net/core/dev.c:9558 rollback_registered net/core/dev.c:9603 [inline] unregister_netdevice_queue+0x1fd/0x420 net/core/dev.c:10748 unregister_netdevice include/linux/netdevice.h:2869 [inline] __tun_detach+0xfa8/0x1240 drivers/net/tun.c:681 tun_detach drivers/net/tun.c:698 [inline] tun_chr_close+0xc4/0x180 drivers/net/tun.c:3450 __fput+0x285/0x980 fs/file_table.c:281 task_work_run+0xe2/0x1a0 kernel/task_work.c:151 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:164 [inline] exit_to_user_mode_prepare+0x155/0x160 kernel/entry/common.c:191 syscall_exit_to_user_mode+0x38/0x230 kernel/entry/common.c:266 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff888017feb200 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 40 bytes inside of 192-byte region [ffff888017feb200, ffff888017feb2c0) The buggy address belongs to the page: page:00000000fd1e5b1a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x17feb flags: 0x100000000000200(slab) raw: 0100000000000200 ffffea0000343e40 0000000300000003 ffff888007c41500 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888017feb100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888017feb180: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc >ffff888017feb200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888017feb280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888017feb300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs (loop7): mounted filesystem without journal. Opts: ,errors=continue ext4 filesystem being mounted at /syzkaller-testdir034675893/syzkaller.gJVlGD/73/file0 supports timestamps until 2038 (0x7fffffff)