================================================================== BUG: KASAN: use-after-free in bq_enqueue kernel/bpf/cpumap.c:749 [inline] BUG: KASAN: use-after-free in cpu_map_enqueue+0xb6/0x370 kernel/bpf/cpumap.c:775 Read of size 8 at addr ffff88801f3e9408 by task syz.8.26200/28199 CPU: 0 PID: 28199 Comm: syz.8.26200 Not tainted 6.1.128-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:427 kasan_report+0x136/0x160 mm/kasan/report.c:531 bq_enqueue kernel/bpf/cpumap.c:749 [inline] cpu_map_enqueue+0xb6/0x370 kernel/bpf/cpumap.c:775 __xdp_do_redirect_frame net/core/filter.c:4324 [inline] xdp_do_redirect_frame+0x2f0/0x660 net/core/filter.c:4382 xdp_test_run_batch net/bpf/test_run.c:314 [inline] bpf_test_run_xdp_live+0xbf4/0x1ea0 net/bpf/test_run.c:362 bpf_prog_test_run_xdp+0x7d1/0x1130 net/bpf/test_run.c:1393 bpf_prog_test_run+0x32f/0x3a0 kernel/bpf/syscall.c:3690 __sys_bpf+0x3eb/0x6c0 kernel/bpf/syscall.c:5043 __do_sys_bpf kernel/bpf/syscall.c:5129 [inline] __se_sys_bpf kernel/bpf/syscall.c:5127 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5127 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: 0033:0x7f127cf8cde9 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:00007f127dd72038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f127d1a5fa0 RCX: 00007f127cf8cde9 RDX: 0000000000000050 RSI: 00002000000000c0 RDI: 000000000000000a RBP: 00007f127d00e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f127d1a5fa0 R15: 00007ffc939e3cb8 Allocated by task 27652: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] prog_array_map_alloc+0x4d/0x1f0 kernel/bpf/arraymap.c:1080 find_and_alloc_map kernel/bpf/syscall.c:131 [inline] map_create+0x4c0/0xd20 kernel/bpf/syscall.c:1143 __sys_bpf+0x2d3/0x6c0 kernel/bpf/syscall.c:5007 __do_sys_bpf kernel/bpf/syscall.c:5129 [inline] __se_sys_bpf kernel/bpf/syscall.c:5127 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5127 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+0xb0/0xc0 mm/kasan/generic.c:486 insert_work+0x54/0x3d0 kernel/workqueue.c:1361 __queue_work+0xb4b/0xf90 kernel/workqueue.c:1520 queue_work_on+0x14b/0x250 kernel/workqueue.c:1548 bpf_map_put_uref kernel/bpf/syscall.c:642 [inline] bpf_map_put_with_uref kernel/bpf/syscall.c:693 [inline] bpf_map_release+0x107/0x130 kernel/bpf/syscall.c:704 __fput+0x3f6/0x8d0 fs/file_table.c:320 task_work_run+0x246/0x300 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486 insert_work+0x54/0x3d0 kernel/workqueue.c:1361 __queue_work+0xb4b/0xf90 kernel/workqueue.c:1520 queue_work_on+0x14b/0x250 kernel/workqueue.c:1548 bpf_map_put_uref kernel/bpf/syscall.c:642 [inline] bpf_map_put_with_uref kernel/bpf/syscall.c:693 [inline] bpf_map_release+0x107/0x130 kernel/bpf/syscall.c:704 __fput+0x3f6/0x8d0 fs/file_table.c:320 task_work_run+0x246/0x300 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88801f3e9400 which belongs to the cache kmalloc-cg-256 of size 256 The buggy address is located 8 bytes inside of 256-byte region [ffff88801f3e9400, ffff88801f3e9500) The buggy address belongs to the physical page: page:ffffea00007cfa00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801f3e8a00 pfn:0x1f3e8 head:ffffea00007cfa00 order:1 compound_mapcount:0 compound_pincount:0 memcg:ffff8880241da101 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001022b00 dead000000000004 ffff888017c42c80 raw: ffff88801f3e8a00 000000008010000b 00000001ffffffff ffff8880241da101 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 14532, tgid 14531 (syz.0.5058), ts 360305682701, free_ts 350504086738 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x3731/0x38d0 mm/page_alloc.c:4328 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5605 alloc_slab_page+0x6a/0x150 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc+0xa1/0x230 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] kzalloc include/linux/slab.h:699 [inline] __register_sysctl_table+0xdc/0x11e0 fs/proc/proc_sysctl.c:1341 ip4_frags_ns_ctl_register net/ipv4/ip_fragment.c:611 [inline] ipv4_frags_init_net+0x211/0x300 net/ipv4/ip_fragment.c:685 ops_init+0x35d/0x610 net/core/net_namespace.c:138 setup_net+0x4f9/0xc70 net/core/net_namespace.c:336 copy_net_ns+0x352/0x590 net/core/net_namespace.c:508 create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110 copy_namespaces+0x397/0x3f0 kernel/nsproxy.c:178 copy_process+0x1ab8/0x4060 kernel/fork.c:2269 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x12a6/0x15b0 mm/page_alloc.c:3384 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3479 tlb_batch_list_free mm/mmu_gather.c:75 [inline] tlb_finish_mmu+0x119/0x1f0 mm/mmu_gather.c:364 exit_mmap+0x3b3/0x980 mm/mmap.c:3250 __mmput+0x115/0x3c0 kernel/fork.c:1200 exit_mm+0x226/0x300 kernel/exit.c:565 do_exit+0x9f1/0x26a0 kernel/exit.c:858 do_group_exit+0x202/0x2b0 kernel/exit.c:1021 get_signal+0x16f7/0x17d0 kernel/signal.c:2871 arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff88801f3e9300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801f3e9380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801f3e9400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801f3e9480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801f3e9500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================