================================================================== 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 ffff8880306a8e08 by task syz.5.1224/8204 CPU: 0 PID: 8204 Comm: syz.5.1224 Not tainted 6.1.118-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 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:284 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:395 kasan_report+0x136/0x160 mm/kasan/report.c:495 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:4300 [inline] xdp_do_redirect_frame+0x2f0/0x660 net/core/filter.c:4358 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:3685 __sys_bpf+0x3eb/0x6c0 kernel/bpf/syscall.c:5038 __do_sys_bpf kernel/bpf/syscall.c:5124 [inline] __se_sys_bpf kernel/bpf/syscall.c:5122 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5122 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: 0033:0x7f24ca77e719 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:00007f24cb60b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f24ca935f80 RCX: 00007f24ca77e719 RDX: 0000000000000050 RSI: 00000000200000c0 RDI: 000000000000000a RBP: 00007f24ca7f175e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f24ca935f80 R15: 00007ffc12e2b258 Allocated by task 8066: 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:557 [inline] kzalloc include/linux/slab.h:693 [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:5002 __do_sys_bpf kernel/bpf/syscall.c:5124 [inline] __se_sys_bpf kernel/bpf/syscall.c:5122 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5122 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 56: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x25c/0x3c0 mm/slub.c:3674 prog_array_map_free+0x17a/0x230 kernel/bpf/arraymap.c:1110 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 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+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 cpu_map_free+0xd7/0x1b0 kernel/bpf/cpumap.c:641 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff8880306a8e00 which belongs to the cache kmalloc-cg-256 of size 256 The buggy address is located 8 bytes inside of 256-byte region [ffff8880306a8e00, ffff8880306a8f00) The buggy address belongs to the physical page: page:ffffea0000c1aa00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x306a8 head:ffffea0000c1aa00 order:1 compound_mapcount:0 compound_pincount:0 memcg:ffff88802c785d01 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888017c42c80 raw: 0000000000000000 0000000000100010 00000001ffffffff ffff88802c785d01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4252, tgid 4252 (syz-executor), ts 69281314792, free_ts 69240557479 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2517 prep_new_page mm/page_alloc.c:2524 [inline] get_page_from_freelist+0x3731/0x38d0 mm/page_alloc.c:4313 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5589 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:562 [inline] kzalloc include/linux/slab.h:693 [inline] __register_sysctl_table+0xdc/0x11e0 fs/proc/proc_sysctl.c:1341 ipv6_sysctl_net_init+0x39f/0x480 net/ipv6/sysctl_net_ipv6.c:288 ops_init+0x35d/0x610 net/core/net_namespace.c:138 setup_net+0x4b5/0xb90 net/core/net_namespace.c:335 copy_net_ns+0x392/0x5d0 net/core/net_namespace.c:481 create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226 ksys_unshare+0x531/0xa40 kernel/fork.c:3201 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1444 [inline] free_pcp_prepare mm/page_alloc.c:1494 [inline] free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3369 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3464 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] __kmem_cache_alloc_node+0x137/0x260 mm/slub.c:3437 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:693 [inline] fqdir_init+0x55/0x170 net/ipv4/inet_fragment.c:191 ipv6_frags_init_net+0x2b/0x2b0 net/ipv6/reassembly.c:529 ops_init+0x35d/0x610 net/core/net_namespace.c:138 setup_net+0x4b5/0xb90 net/core/net_namespace.c:335 copy_net_ns+0x392/0x5d0 net/core/net_namespace.c:481 create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226 ksys_unshare+0x531/0xa40 kernel/fork.c:3201 Memory state around the buggy address: ffff8880306a8d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880306a8d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880306a8e00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880306a8e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880306a8f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================