================================================================== BUG: KASAN: use-after-free in bq_enqueue kernel/bpf/cpumap.c:749 [inline] BUG: KASAN: use-after-free in cpu_map_enqueue+0xb4/0x370 kernel/bpf/cpumap.c:775 Read of size 8 at addr ffff888136360108 by task syz.0.554/2211 CPU: 1 PID: 2211 Comm: syz.0.554 Not tainted 6.1.112-syzkaller-00109-gfadb08b36671 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x158/0x4e0 mm/kasan/report.c:427 kasan_report+0x13c/0x170 mm/kasan/report.c:531 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:351 bq_enqueue kernel/bpf/cpumap.c:749 [inline] cpu_map_enqueue+0xb4/0x370 kernel/bpf/cpumap.c:775 __xdp_do_redirect_frame net/core/filter.c:4298 [inline] xdp_do_redirect_frame+0x275/0x800 net/core/filter.c:4356 xdp_test_run_batch net/bpf/test_run.c:314 [inline] bpf_test_run_xdp_live+0xc30/0x1f70 net/bpf/test_run.c:362 bpf_prog_test_run_xdp+0x7d1/0x1130 net/bpf/test_run.c:1393 bpf_prog_test_run+0x3b0/0x630 kernel/bpf/syscall.c:3665 __sys_bpf+0x59f/0x7f0 kernel/bpf/syscall.c:5020 __do_sys_bpf kernel/bpf/syscall.c:5106 [inline] __se_sys_bpf kernel/bpf/syscall.c:5104 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5104 x64_sys_call+0x87f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7ff28a97e719 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff28b7f5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007ff28ab36058 RCX: 00007ff28a97e719 RDX: 0000000000000050 RSI: 00000000200000c0 RDI: 000000000000000a RBP: 00007ff28a9f132e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff28ab36058 R15: 00007ffc6ce55588 Allocated by task 2159: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:379 [inline] __kasan_kmalloc+0x9c/0xb0 mm/kasan/common.c:388 kasan_kmalloc include/linux/kasan.h:212 [inline] kmalloc_trace+0x44/0xa0 mm/slab_common.c:1033 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:693 [inline] push_stack+0x8e/0x4f0 kernel/bpf/verifier.c:1227 check_cond_jmp_op kernel/bpf/verifier.c:10472 [inline] do_check+0x9369/0xe040 kernel/bpf/verifier.c:12711 do_check_common+0x6ca/0xca0 kernel/bpf/verifier.c:14915 do_check_main kernel/bpf/verifier.c:14978 [inline] bpf_check+0x6d0d/0x17ec0 kernel/bpf/verifier.c:15555 bpf_prog_load+0x1304/0x1bf0 kernel/bpf/syscall.c:2626 __sys_bpf+0x52c/0x7f0 kernel/bpf/syscall.c:5002 __do_sys_bpf kernel/bpf/syscall.c:5106 [inline] __se_sys_bpf kernel/bpf/syscall.c:5104 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5104 x64_sys_call+0x87f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 2159: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x131/0x180 mm/kasan/common.c:241 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:249 kasan_slab_free include/linux/kasan.h:178 [inline] slab_free_hook mm/slub.c:1745 [inline] slab_free_freelist_hook mm/slub.c:1771 [inline] slab_free mm/slub.c:3684 [inline] __kmem_cache_free+0x218/0x3b0 mm/slub.c:3697 kfree+0x7a/0xf0 mm/slab_common.c:990 pop_stack kernel/bpf/verifier.c:1213 [inline] do_check+0x7bfe/0xe040 kernel/bpf/verifier.c:12700 do_check_common+0x6ca/0xca0 kernel/bpf/verifier.c:14915 do_check_main kernel/bpf/verifier.c:14978 [inline] bpf_check+0x6d0d/0x17ec0 kernel/bpf/verifier.c:15555 bpf_prog_load+0x1304/0x1bf0 kernel/bpf/syscall.c:2626 __sys_bpf+0x52c/0x7f0 kernel/bpf/syscall.c:5002 __do_sys_bpf kernel/bpf/syscall.c:5106 [inline] __se_sys_bpf kernel/bpf/syscall.c:5104 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5104 x64_sys_call+0x87f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb4/0xc0 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496 insert_work+0x56/0x310 kernel/workqueue.c:1368 __queue_work+0x9b6/0xd70 kernel/workqueue.c:1527 queue_work_on+0x105/0x170 kernel/workqueue.c:1555 queue_work include/linux/workqueue.h:510 [inline] schedule_work include/linux/workqueue.h:571 [inline] __cpu_map_entry_replace kernel/bpf/cpumap.c:558 [inline] cpu_map_free+0x1e7/0x2c0 kernel/bpf/cpumap.c:641 bpf_map_free_deferred+0xf7/0x1b0 kernel/bpf/syscall.c:637 process_one_work+0x73d/0xcb0 kernel/workqueue.c:2299 worker_thread+0xa60/0x1260 kernel/workqueue.c:2446 kthread+0x26d/0x300 kernel/kthread.c:386 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb4/0xc0 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496 __call_rcu_common kernel/rcu/tree.c:2807 [inline] call_rcu+0xdc/0x10f0 kernel/rcu/tree.c:2926 __cpu_map_entry_replace kernel/bpf/cpumap.c:556 [inline] cpu_map_free+0x109/0x2c0 kernel/bpf/cpumap.c:641 bpf_map_free_deferred+0xf7/0x1b0 kernel/bpf/syscall.c:637 process_one_work+0x73d/0xcb0 kernel/workqueue.c:2299 worker_thread+0xa60/0x1260 kernel/workqueue.c:2446 kthread+0x26d/0x300 kernel/kthread.c:386 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff888136360100 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 8 bytes inside of 192-byte region [ffff888136360100, ffff8881363601c0) The buggy address belongs to the physical page: page:ffffea0004d8d800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x136360 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea000451e5c0 dead000000000004 ffff888100042c00 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 865, tgid 864 (syz.0.165), ts 33690158344, free_ts 33683795546 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x213/0x220 mm/page_alloc.c:2590 prep_new_page+0x1b/0x110 mm/page_alloc.c:2597 get_page_from_freelist+0x2980/0x2a10 mm/page_alloc.c:4439 __alloc_pages+0x234/0x610 mm/page_alloc.c:5728 alloc_slab_page+0x6c/0xf0 allocate_slab mm/slub.c:1962 [inline] new_slab+0x90/0x3e0 mm/slub.c:2015 ___slab_alloc+0x6f9/0xb80 mm/slub.c:3203 __slab_alloc+0x5d/0xa0 mm/slub.c:3302 slab_alloc_node mm/slub.c:3387 [inline] __kmem_cache_alloc_node+0x1af/0x250 mm/slub.c:3460 __do_kmalloc_node mm/slab_common.c:937 [inline] __kmalloc_node_track_caller+0xa2/0x1e0 mm/slab_common.c:958 kmemdup+0x29/0x60 mm/util.c:134 _Z7kmemdupPKvU17pass_object_size0mj include/linux/fortify-string.h:585 [inline] neigh_parms_alloc+0x81/0x530 net/core/neighbour.c:1706 ipv6_add_dev+0x317/0x11a0 net/ipv6/addrconf.c:396 addrconf_notify+0x6d2/0xe10 net/ipv6/addrconf.c:3601 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0x8c/0xf0 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:1978 [inline] call_netdevice_notifiers_extack net/core/dev.c:2016 [inline] call_netdevice_notifiers+0x145/0x1b0 net/core/dev.c:2030 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1498 [inline] free_pcp_prepare mm/page_alloc.c:1572 [inline] free_unref_page_prepare+0x83d/0x850 mm/page_alloc.c:3511 free_unref_page+0xb2/0x5c0 mm/page_alloc.c:3607 free_the_page mm/page_alloc.c:798 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:5817 free_pages+0x7c/0x90 mm/page_alloc.c:5828 _pgd_free arch/x86/mm/pgtable.c:420 [inline] pgd_free+0x17d/0x190 arch/x86/mm/pgtable.c:476 mm_free_pgd kernel/fork.c:833 [inline] __mmdrop+0xb0/0x3e0 kernel/fork.c:884 mmdrop include/linux/sched/mm.h:50 [inline] mmdrop_sched include/linux/sched/mm.h:78 [inline] finish_task_switch+0x2cd/0x7b0 kernel/sched/core.c:5319 context_switch kernel/sched/core.c:5420 [inline] __schedule+0xcbd/0x1560 kernel/sched/core.c:6747 schedule+0xc3/0x180 kernel/sched/core.c:6823 do_nanosleep+0x149/0x580 kernel/time/hrtimer.c:2047 hrtimer_nanosleep+0x1c5/0x3f0 kernel/time/hrtimer.c:2100 common_nsleep+0x91/0xb0 kernel/time/posix-timers.c:1267 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1308 [inline] __se_sys_clock_nanosleep+0x323/0x3b0 kernel/time/posix-timers.c:1285 __x64_sys_clock_nanosleep+0x9b/0xb0 kernel/time/posix-timers.c:1285 x64_sys_call+0x609/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:231 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 Memory state around the buggy address: ffff888136360000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888136360080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888136360100: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888136360180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888136360200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== general protection fault, probably for non-canonical address 0xe0a84d39bede0118: 0000 [#1] PREEMPT SMP KASAN KASAN: maybe wild-memory-access in range [0x054289cdf6f008c0-0x054289cdf6f008c7] CPU: 1 PID: 2211 Comm: syz.0.554 Tainted: G B 6.1.112-syzkaller-00109-gfadb08b36671 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:bq_enqueue kernel/bpf/cpumap.c:751 [inline] RIP: 0010:cpu_map_enqueue+0x113/0x370 kernel/bpf/cpumap.c:775 Code: e8 03 42 80 3c 30 00 74 08 48 89 df e8 b6 e1 24 00 4c 8b 23 4f 8d 74 3c 58 4d 89 f5 49 c1 ed 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 44 05 00 84 c0 0f 85 a8 01 00 00 4d 01 fc 41 8b 1e bf 08 RSP: 0018:ffffc90000ae7600 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffffffff86747898 RCX: ffff88812da99440 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000008 RBP: ffffc90000ae7638 R08: ffffffff81982bee R09: fffffbfff0f6defd R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f6f00000 R13: 00a85139bede0118 R14: 054289cdf6f008c7 R15: 0543014c0000086f FS: 00007ff28b7f56c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002000cf3d CR3: 0000000116838000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __xdp_do_redirect_frame net/core/filter.c:4298 [inline] xdp_do_redirect_frame+0x275/0x800 net/core/filter.c:4356 xdp_test_run_batch net/bpf/test_run.c:314 [inline] bpf_test_run_xdp_live+0xc30/0x1f70 net/bpf/test_run.c:362 bpf_prog_test_run_xdp+0x7d1/0x1130 net/bpf/test_run.c:1393 bpf_prog_test_run+0x3b0/0x630 kernel/bpf/syscall.c:3665 __sys_bpf+0x59f/0x7f0 kernel/bpf/syscall.c:5020 __do_sys_bpf kernel/bpf/syscall.c:5106 [inline] __se_sys_bpf kernel/bpf/syscall.c:5104 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5104 x64_sys_call+0x87f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7ff28a97e719 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff28b7f5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007ff28ab36058 RCX: 00007ff28a97e719 RDX: 0000000000000050 RSI: 00000000200000c0 RDI: 000000000000000a RBP: 00007ff28a9f132e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff28ab36058 R15: 00007ffc6ce55588 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bq_enqueue kernel/bpf/cpumap.c:751 [inline] RIP: 0010:cpu_map_enqueue+0x113/0x370 kernel/bpf/cpumap.c:775 Code: e8 03 42 80 3c 30 00 74 08 48 89 df e8 b6 e1 24 00 4c 8b 23 4f 8d 74 3c 58 4d 89 f5 49 c1 ed 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 44 05 00 84 c0 0f 85 a8 01 00 00 4d 01 fc 41 8b 1e bf 08 RSP: 0018:ffffc90000ae7600 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffffffff86747898 RCX: ffff88812da99440 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000008 RBP: ffffc90000ae7638 R08: ffffffff81982bee R09: fffffbfff0f6defd R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f6f00000 R13: 00a85139bede0118 R14: 054289cdf6f008c7 R15: 0543014c0000086f FS: 00007ff28b7f56c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002000cf3d CR3: 0000000116838000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: e8 03 42 80 3c call 0x3c804208 5: 30 00 xor %al,(%rax) 7: 74 08 je 0x11 9: 48 89 df mov %rbx,%rdi c: e8 b6 e1 24 00 call 0x24e1c7 11: 4c 8b 23 mov (%rbx),%r12 14: 4f 8d 74 3c 58 lea 0x58(%r12,%r15,1),%r14 19: 4d 89 f5 mov %r14,%r13 1c: 49 c1 ed 03 shr $0x3,%r13 20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 27: fc ff df * 2a: 41 0f b6 44 05 00 movzbl 0x0(%r13,%rax,1),%eax <-- trapping instruction 30: 84 c0 test %al,%al 32: 0f 85 a8 01 00 00 jne 0x1e0 38: 4d 01 fc add %r15,%r12 3b: 41 8b 1e mov (%r14),%ebx 3e: bf .byte 0xbf 3f: 08 .byte 0x8