================================================================== 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 ffff888137543208 by task syz.2.781/2022 CPU: 0 PID: 2022 Comm: syz.2.781 Not tainted 6.1.118-syzkaller-00019-ge09bed30088f #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:4300 [inline] xdp_do_redirect_frame+0x275/0x800 net/core/filter.c:4358 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: 0033:0x7ffb4fd85d29 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:00007ffb4fbff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007ffb4ff75fa0 RCX: 00007ffb4fd85d29 RDX: 0000000000000050 RSI: 00000000200000c0 RDI: 000000000000000a RBP: 00007ffb4fe01b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffb4ff75fa0 R15: 00007ffe59a91938 Allocated by task 1510: 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] __do_kmalloc_node mm/slab_common.c:938 [inline] __kmalloc_node+0xb4/0x1e0 mm/slab_common.c:945 kmalloc_node include/linux/slab.h:583 [inline] bpf_map_kmalloc_node+0xd0/0x2c0 kernel/bpf/syscall.c:454 __cpu_map_entry_alloc kernel/bpf/cpumap.c:445 [inline] cpu_map_update_elem+0x28f/0xf50 kernel/bpf/cpumap.c:603 bpf_map_update_value+0x1a3/0x410 kernel/bpf/syscall.c:190 map_update_elem+0x500/0x680 kernel/bpf/syscall.c:1443 __sys_bpf+0x460/0x7f0 kernel/bpf/syscall.c:4990 __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 1512: 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:3686 [inline] __kmem_cache_free+0x21d/0x410 mm/slub.c:3702 kfree+0x7a/0xf0 mm/slab_common.c:990 put_cpu_map_entry+0x6e2/0x760 kernel/bpf/cpumap.c:161 cpu_map_kthread_run+0x2463/0x2520 kernel/bpf/cpumap.c:408 kthread+0x26d/0x300 kernel/kthread.c:386 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 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 ffff888137543200 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 8 bytes inside of 192-byte region [ffff888137543200, ffff8881375432c0) The buggy address belongs to the physical page: page:ffffea0004dd50c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x137543 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 0000000000000000 dead000000000001 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 964, tgid 963 (syz.3.296), ts 35379001489, free_ts 35378920802 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+0x2f41/0x2fc0 mm/page_alloc.c:4462 __alloc_pages+0x234/0x610 mm/page_alloc.c:5759 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+0x207/0x2a0 mm/slub.c:3462 kmalloc_trace+0x2a/0xa0 mm/slab_common.c:1028 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:10487 [inline] do_check+0x9369/0xe040 kernel/bpf/verifier.c:12726 do_check_common+0x6ca/0xca0 kernel/bpf/verifier.c:14930 do_check_main kernel/bpf/verifier.c:14993 [inline] bpf_check+0x6d12/0x17ed0 kernel/bpf/verifier.c:15570 bpf_prog_load+0x1304/0x1bf0 kernel/bpf/syscall.c:2626 __sys_bpf+0x52c/0x7f0 kernel/bpf/syscall.c:5002 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:5848 __vunmap+0x9f3/0xb60 mm/vmalloc.c:2728 __vfree mm/vmalloc.c:2776 [inline] vfree+0x5c/0x80 mm/vmalloc.c:2807 bpf_prog_calc_tag+0x65f/0x8f0 kernel/bpf/core.c:343 resolve_pseudo_ldimm64+0xe0/0x1240 kernel/bpf/verifier.c:13021 bpf_check+0x5d2b/0x17ed0 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 Memory state around the buggy address: ffff888137543100: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888137543180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888137543200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888137543280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888137543300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== general protection fault, probably for non-canonical address 0xe0c20d417edc00c8: 0000 [#1] PREEMPT SMP KASAN KASAN: maybe wild-memory-access in range [0x06108a0bf6e00640-0x06108a0bf6e00647] CPU: 0 PID: 2022 Comm: syz.2.781 Tainted: G B 6.1.118-syzkaller-00019-ge09bed30088f #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 46 f0 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:ffffc9000e42f600 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffffffff8674b890 RCX: 0000000000080000 RDX: ffffc9000238d000 RSI: 000000000002e935 RDI: 000000000002e936 RBP: ffffc9000e42f638 R08: ffffffff81980bce R09: fffffbfff0f6e2fd R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f6e00000 R13: 00c211417edc00c8 R14: 06108a0bf6e00640 R15: 0611018a000005e8 FS: 00007ffb4fbff6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e21aff8 CR3: 0000000111a5f000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __xdp_do_redirect_frame net/core/filter.c:4300 [inline] xdp_do_redirect_frame+0x275/0x800 net/core/filter.c:4358 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: 0033:0x7ffb4fd85d29 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:00007ffb4fbff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007ffb4ff75fa0 RCX: 00007ffb4fd85d29 RDX: 0000000000000050 RSI: 00000000200000c0 RDI: 000000000000000a RBP: 00007ffb4fe01b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffb4ff75fa0 R15: 00007ffe59a91938 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 46 f0 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:ffffc9000e42f600 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffffffff8674b890 RCX: 0000000000080000 RDX: ffffc9000238d000 RSI: 000000000002e935 RDI: 000000000002e936 RBP: ffffc9000e42f638 R08: ffffffff81980bce R09: fffffbfff0f6e2fd R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f6e00000 R13: 00c211417edc00c8 R14: 06108a0bf6e00640 R15: 0611018a000005e8 FS: 00007ffb4fbff6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e21aff8 CR3: 0000000111a5f000 CR4: 00000000003506b0 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 46 f0 24 00 call 0x24f057 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