================================================================== BUG: KASAN: use-after-free in get_kprobe+0xa1/0xc0 kernel/kprobes.c:372 Read of size 8 at addr ffff888009790a28 by task syz-executor.5/10011 CPU: 1 PID: 10011 Comm: syz-executor.5 Not tainted 5.10.56 #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+0xa1/0xc0 kernel/kprobes.c:372 arch_check_optimized_kprobe+0xa9/0x180 arch/x86/kernel/kprobes/opt.c:355 optimize_kprobe kernel/kprobes.c:684 [inline] optimize_kprobe+0x136/0x420 kernel/kprobes.c:668 __arm_kprobe kernel/kprobes.c:964 [inline] arm_kprobe+0xa5/0x110 kernel/kprobes.c:1139 enable_kprobe+0x11d/0x180 kernel/kprobes.c:2331 __enable_trace_kprobe kernel/trace/trace_kprobe.c:326 [inline] enable_trace_kprobe+0x1c8/0x350 kernel/trace/trace_kprobe.c:380 kprobe_register+0x80/0xb0 kernel/trace/trace_kprobe.c:1704 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline] perf_trace_event_init+0x550/0x9c0 kernel/trace/trace_event_perf.c:204 perf_kprobe_init+0x1c5/0x280 kernel/trace/trace_event_perf.c:281 perf_kprobe_event_init+0xf8/0x1c0 kernel/events/core.c:9595 perf_try_init_event+0x130/0x570 kernel/events/core.c:10973 perf_init_event kernel/events/core.c:11025 [inline] perf_event_alloc.part.0+0xd96/0x2b30 kernel/events/core.c:11303 perf_event_alloc kernel/events/core.c:11682 [inline] __do_sys_perf_event_open+0x57c/0x2d00 kernel/events/core.c:11780 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x466609 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:00007f24963fd188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000020001d80 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffcc68c8baf R14: 00007f24963fd300 R15: 0000000000022000 Allocated by task 9992: 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:1833 perf_kprobe_init+0x18c/0x280 kernel/trace/trace_event_perf.c:272 perf_kprobe_event_init+0xf8/0x1c0 kernel/events/core.c:9595 perf_try_init_event+0x130/0x570 kernel/events/core.c:10973 perf_init_event kernel/events/core.c:11025 [inline] perf_event_alloc.part.0+0xd96/0x2b30 kernel/events/core.c:11303 perf_event_alloc kernel/events/core.c:11682 [inline] __do_sys_perf_event_open+0x57c/0x2d00 kernel/events/core.c:11780 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 7524: 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+0x64/0x150 mm/slub.c:1575 slab_free mm/slub.c:3140 [inline] kfree+0xca/0x360 mm/slub.c:4116 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:292 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:2960 [inline] call_rcu+0x8a/0xa20 kernel/rcu/tree.c:3034 neigh_parms_release net/core/neighbour.c:1670 [inline] neigh_parms_release+0x178/0x1d0 net/core/neighbour.c:1660 addrconf_ifdown.isra.0+0xf43/0x14e0 net/ipv6/addrconf.c:3847 addrconf_notify+0x159/0x22f0 net/ipv6/addrconf.c:3628 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:9540 unregister_netdevice_many.part.0+0x18/0x220 net/core/dev.c:10749 unregister_netdevice_many+0x36/0x50 net/core/dev.c:10748 sit_exit_batch_net+0x508/0x730 net/ipv6/sit.c:1942 ops_exit_list+0x113/0x160 net/core/net_namespace.c:190 cleanup_net+0x484/0x8e0 net/core/net_namespace.c:604 process_one_work+0x9a9/0x1590 kernel/workqueue.c:2270 worker_thread+0x61d/0x1310 kernel/workqueue.c:2416 kthread+0x38f/0x470 kernel/kthread.c:292 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:296 The buggy address belongs to the object at ffff888009790a00 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 40 bytes inside of 192-byte region [ffff888009790a00, ffff888009790ac0) The buggy address belongs to the page: page:00000000a0fdfd33 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888009790800 pfn:0x9790 flags: 0x100000000000200(slab) raw: 0100000000000200 ffffea00003ec080 0000000700000007 ffff888007c41500 raw: ffff888009790800 000000008010000f 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888009790900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888009790980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888009790a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888009790a80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888009790b00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== netlink: 280 bytes leftover after parsing attributes in process `syz-executor.7'. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 10041 at kernel/kprobes.c:764 reuse_unused_kprobe kernel/kprobes.c:764 [inline] WARNING: CPU: 0 PID: 10041 at kernel/kprobes.c:764 register_aggr_kprobe kernel/kprobes.c:1447 [inline] WARNING: CPU: 0 PID: 10041 at kernel/kprobes.c:764 register_kprobe kernel/kprobes.c:1713 [inline] WARNING: CPU: 0 PID: 10041 at kernel/kprobes.c:764 register_kprobe+0x1008/0x1330 kernel/kprobes.c:1682 Modules linked in: CPU: 0 PID: 10041 Comm: syz-executor.0 Tainted: G B 5.10.56 #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 c2 ef ed ff e9 5b f9 ff ff e8 38 64 ff ff <0f> 0b e9 9d fc ff ff 4c 89 ff e8 d9 95 2a 00 e9 99 f5 ff ff e8 cf RSP: 0018:ffff88805db1fbd0 EFLAGS: 00010212 RAX: 000000000000b192 RBX: ffff888009790a78 RCX: ffffc900007e5000 RDX: 0000000000040000 RSI: ffffffff81402218 RDI: ffff888009790a78 RBP: ffff88800dd1f018 R08: 0000000000000000 R09: ffffffff84ce8a47 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: ffff88800dd1f028 R14: ffff888009790a70 R15: ffff888009790a00 FS: 00007f394bac4700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ce22000 CR3: 000000005db5c000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 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:1833 perf_kprobe_init+0x18c/0x280 kernel/trace/trace_event_perf.c:272 perf_kprobe_event_init+0xf8/0x1c0 kernel/events/core.c:9595 perf_try_init_event+0x130/0x570 kernel/events/core.c:10973 perf_init_event kernel/events/core.c:11025 [inline] perf_event_alloc.part.0+0xd96/0x2b30 kernel/events/core.c:11303 perf_event_alloc kernel/events/core.c:11682 [inline] __do_sys_perf_event_open+0x57c/0x2d00 kernel/events/core.c:11780 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x466609 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:00007f394bac4188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020001d80 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffe93ee8b0f R14: 00007f394bac4300 R15: 0000000000022000 irq event stamp: 0 hardirqs last enabled at (0): [<0000000000000000>] 0x0 hardirqs last disabled at (0): [] copy_process+0x15bc/0x6650 kernel/fork.c:2049 softirqs last enabled at (0): [] copy_process+0x15fd/0x6650 kernel/fork.c:2053 softirqs last disabled at (0): [<0000000000000000>] 0x0 ---[ end trace b67529fc1c0477f5 ]--- selinux_netlink_send: 16 callbacks suppressed SELinux: unrecognized netlink message: protocol=0 nlmsg_type=33608 sclass=netlink_route_socket pid=10042 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=33608 sclass=netlink_route_socket pid=10081 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=50422 sclass=netlink_route_socket pid=10081 comm=syz-executor.1