================================================================== BUG: KASAN: use-after-free in get_kprobe kernel/kprobes.c:372 [inline] BUG: KASAN: use-after-free in __get_valid_kprobe+0x1ff/0x230 kernel/kprobes.c:1585 Read of size 8 at addr ffff8880435b4928 by task syz-executor.4/9768 CPU: 1 PID: 9768 Comm: syz-executor.4 Not tainted 5.10.90 #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_valid_kprobe+0x1ff/0x230 kernel/kprobes.c:1585 check_kprobe_rereg kernel/kprobes.c:1606 [inline] register_kprobe+0x119/0x1330 kernel/kprobes.c:1695 __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:1837 perf_kprobe_init+0x18c/0x280 kernel/trace/trace_event_perf.c:272 perf_kprobe_event_init+0xf8/0x1c0 kernel/events/core.c:9602 perf_try_init_event+0x130/0x570 kernel/events/core.c:10980 perf_init_event kernel/events/core.c:11032 [inline] perf_event_alloc.part.0+0xd96/0x2b30 kernel/events/core.c:11310 perf_event_alloc kernel/events/core.c:11689 [inline] __do_sys_perf_event_open+0x57c/0x2d00 kernel/events/core.c:11787 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f57df0e7b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f57dc65d188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f57df1faf60 RCX: 00007f57df0e7b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020001d80 RBP: 00007f57df141f6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffd093beef R14: 00007f57dc65d300 R15: 0000000000022000 Allocated by task 9768: 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:1837 perf_kprobe_init+0x18c/0x280 kernel/trace/trace_event_perf.c:272 perf_kprobe_event_init+0xf8/0x1c0 kernel/events/core.c:9602 perf_try_init_event+0x130/0x570 kernel/events/core.c:10980 perf_init_event kernel/events/core.c:11032 [inline] perf_event_alloc.part.0+0xd96/0x2b30 kernel/events/core.c:11310 perf_event_alloc kernel/events/core.c:11689 [inline] __do_sys_perf_event_open+0x57c/0x2d00 kernel/events/core.c:11787 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 8174: 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:2270 worker_thread+0x61d/0x1310 kernel/workqueue.c:2416 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:2962 [inline] call_rcu+0x8a/0xa00 kernel/rcu/tree.c:3036 neigh_parms_release net/core/neighbour.c:1675 [inline] neigh_parms_release+0x178/0x1d0 net/core/neighbour.c:1665 addrconf_ifdown.isra.0+0xf43/0x14e0 net/ipv6/addrconf.c:3850 addrconf_notify+0x159/0x2350 net/ipv6/addrconf.c:3631 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:9552 rollback_registered net/core/dev.c:9597 [inline] unregister_netdevice_queue+0x1fd/0x420 net/core/dev.c:10742 unregister_netdevice include/linux/netdevice.h:2868 [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 ffff8880435b4900 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 40 bytes inside of 192-byte region [ffff8880435b4900, ffff8880435b49c0) The buggy address belongs to the page: page:00000000f93d1ab0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x435b4 flags: 0x100000000000200(slab) raw: 0100000000000200 dead000000000100 dead000000000122 ffff888007c41500 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880435b4800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880435b4880: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880435b4900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880435b4980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880435b4a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ------------[ cut here ]------------ WARNING: CPU: 1 PID: 9768 at kernel/kprobes.c:764 reuse_unused_kprobe kernel/kprobes.c:764 [inline] WARNING: CPU: 1 PID: 9768 at kernel/kprobes.c:764 register_aggr_kprobe kernel/kprobes.c:1447 [inline] WARNING: CPU: 1 PID: 9768 at kernel/kprobes.c:764 register_kprobe kernel/kprobes.c:1713 [inline] WARNING: CPU: 1 PID: 9768 at kernel/kprobes.c:764 register_kprobe+0x1008/0x1330 kernel/kprobes.c:1682 Modules linked in: CPU: 1 PID: 9768 Comm: syz-executor.4 Tainted: G B 5.10.90 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 RIP: 0010:reuse_unused_kprobe kernel/kprobes.c:764 [inline] RIP: 0010:register_aggr_kprobe kernel/kprobes.c:1447 [inline] RIP: 0010:register_kprobe kernel/kprobes.c:1713 [inline] RIP: 0010:register_kprobe+0x1008/0x1330 kernel/kprobes.c:1682 Code: 4d 89 6c 24 08 e8 58 64 ff ff 41 89 dc 48 b8 22 01 00 00 00 00 ad de 48 89 45 08 e8 82 e7 ed ff e9 5b f9 ff ff e8 38 64 ff ff <0f> 0b e9 9d fc ff ff 4c 89 ff e8 b9 af 2a 00 e9 99 f5 ff ff e8 af RSP: 0018:ffff888038017bd0 EFLAGS: 00010212 RAX: 000000000003ace7 RBX: ffff8880435b4978 RCX: ffffc90006c19000 RDX: 0000000000040000 RSI: ffffffff81403578 RDI: ffff8880435b4978 RBP: ffff88804a417c18 R08: 0000000000000000 R09: ffffffff84ce8dc7 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: ffff88804a417c28 R14: ffff8880435b4970 R15: ffff8880435b4900 FS: 00007f57dc65d700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb3fb3fbdb0 CR3: 000000003b2ce000 CR4: 0000000000350ee0 Call Trace: __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:1837 perf_kprobe_init+0x18c/0x280 kernel/trace/trace_event_perf.c:272 perf_kprobe_event_init+0xf8/0x1c0 kernel/events/core.c:9602 perf_try_init_event+0x130/0x570 kernel/events/core.c:10980 perf_init_event kernel/events/core.c:11032 [inline] perf_event_alloc.part.0+0xd96/0x2b30 kernel/events/core.c:11310 perf_event_alloc kernel/events/core.c:11689 [inline] __do_sys_perf_event_open+0x57c/0x2d00 kernel/events/core.c:11787 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f57df0e7b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f57dc65d188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f57df1faf60 RCX: 00007f57df0e7b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020001d80 RBP: 00007f57df141f6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffd093beef R14: 00007f57dc65d300 R15: 0000000000022000 irq event stamp: 824 hardirqs last enabled at (823): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (823): [] _raw_spin_unlock_irq+0x1f/0x30 kernel/locking/spinlock.c:199 hardirqs last disabled at (824): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (824): [] _raw_spin_lock_irqsave+0x4b/0x50 kernel/locking/spinlock.c:159 softirqs last enabled at (238): [] asm_call_irq_on_stack+0x12/0x20 softirqs last disabled at (65): [] asm_call_irq_on_stack+0x12/0x20 ---[ end trace ca0f13a7c7acda66 ]--- EXT4-fs (sda): Cannot specify journal on remount EXT4-fs (sda): Cannot specify journal on remount kmemleak: 12 new suspected memory leaks (see /sys/kernel/debug/kmemleak)