================================================================== BUG: KASAN: use-after-free in cpu_map_generic_redirect+0x1b9/0x5d0 kernel/bpf/cpumap.c:786 Read of size 8 at addr ffff88805d708018 by task kworker/1:14/5995 CPU: 1 PID: 5995 Comm: kworker/1:14 Not tainted 5.15.178-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: wg-crypt-wg0 wg_packet_tx_worker Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 cpu_map_generic_redirect+0x1b9/0x5d0 kernel/bpf/cpumap.c:786 xdp_do_generic_redirect_map net/core/filter.c:4189 [inline] xdp_do_generic_redirect+0x401/0x850 net/core/filter.c:4236 do_xdp_generic+0x4f5/0x6c0 net/core/dev.c:4911 __netif_receive_skb_core+0x1bf1/0x3df0 net/core/dev.c:5316 __netif_receive_skb_one_core net/core/dev.c:5491 [inline] __netif_receive_skb+0x11c/0x530 net/core/dev.c:5607 process_backlog+0x363/0x7f0 net/core/dev.c:6484 __napi_poll+0xc7/0x440 net/core/dev.c:7043 napi_poll net/core/dev.c:7110 [inline] net_rx_action+0x617/0xda0 net/core/dev.c:7200 handle_softirqs+0x3a7/0x930 kernel/softirq.c:558 do_softirq+0x162/0x240 kernel/softirq.c:459 __local_bh_enable_ip+0x1b1/0x1f0 kernel/softirq.c:383 wg_socket_send_skb_to_peer+0x172/0x1d0 drivers/net/wireguard/socket.c:184 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline] wg_packet_tx_worker+0x1a1/0x7a0 drivers/net/wireguard/send.c:276 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Allocated by task 4760: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xba/0xf0 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:264 [inline] __kmalloc_node+0x199/0x390 mm/slub.c:4455 kmalloc_node include/linux/slab.h:614 [inline] bpf_map_kmalloc_node+0xdb/0x160 kernel/bpf/syscall.c:430 __cpu_map_entry_alloc kernel/bpf/cpumap.c:442 [inline] cpu_map_update_elem+0x273/0xe50 kernel/bpf/cpumap.c:600 map_update_elem+0x6a0/0x7c0 kernel/bpf/syscall.c:1185 __sys_bpf+0x2fd/0x670 kernel/bpf/syscall.c:4644 __do_sys_bpf kernel/bpf/syscall.c:4760 [inline] __se_sys_bpf kernel/bpf/syscall.c:4758 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4758 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348 insert_work+0x54/0x3e0 kernel/workqueue.c:1366 __queue_work+0x963/0xd00 kernel/workqueue.c:1532 queue_work_on+0x14b/0x250 kernel/workqueue.c:1559 cpu_map_free+0xd7/0x1b0 kernel/bpf/cpumap.c:638 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Second to last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3007 [inline] call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3087 __cpu_map_entry_replace+0x74/0x170 kernel/bpf/cpumap.c:553 cpu_map_free+0xd7/0x1b0 kernel/bpf/cpumap.c:638 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff88805d708000 which belongs to the cache kmalloc-cg-256 of size 256 The buggy address is located 24 bytes inside of 256-byte region [ffff88805d708000, ffff88805d708100) The buggy address belongs to the page: page:ffffea000175c200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88805d708c00 pfn:0x5d708 head:ffffea000175c200 order:1 compound_mapcount:0 memcg:ffff888076282901 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888017442c80 raw: ffff88805d708c00 000000008010000b 00000001ffffffff ffff888076282901 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 4760, ts 79845043112, free_ts 79835557728 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x3b78/0x3d40 mm/page_alloc.c:4192 __alloc_pages+0x272/0x700 mm/page_alloc.c:5465 __alloc_pages_node include/linux/gfp.h:570 [inline] alloc_slab_page mm/slub.c:1777 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xb1/0x4b0 mm/slub.c:1975 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] __kmalloc_node+0x1fa/0x390 mm/slub.c:4451 kmalloc_node include/linux/slab.h:614 [inline] bpf_map_kmalloc_node+0xdb/0x160 kernel/bpf/syscall.c:430 __cpu_map_entry_alloc kernel/bpf/cpumap.c:442 [inline] cpu_map_update_elem+0x273/0xe50 kernel/bpf/cpumap.c:600 map_update_elem+0x6a0/0x7c0 kernel/bpf/syscall.c:1185 __sys_bpf+0x2fd/0x670 kernel/bpf/syscall.c:4644 __do_sys_bpf kernel/bpf/syscall.c:4760 [inline] __se_sys_bpf kernel/bpf/syscall.c:4758 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4758 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317 free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396 kasan_depopulate_vmalloc_pte+0x66/0x80 mm/kasan/shadow.c:375 apply_to_pte_range mm/memory.c:2573 [inline] apply_to_pmd_range mm/memory.c:2617 [inline] apply_to_pud_range mm/memory.c:2653 [inline] apply_to_p4d_range mm/memory.c:2689 [inline] __apply_to_page_range+0x9bf/0xcc0 mm/memory.c:2723 kasan_release_vmalloc+0x96/0xb0 mm/kasan/shadow.c:485 __purge_vmap_area_lazy+0x15ae/0x1740 mm/vmalloc.c:1704 _vm_unmap_aliases+0x453/0x4e0 mm/vmalloc.c:2107 change_page_attr_set_clr+0x308/0x1050 arch/x86/mm/pat/set_memory.c:1740 change_page_attr_clear arch/x86/mm/pat/set_memory.c:1797 [inline] set_memory_ro+0xa1/0xe0 arch/x86/mm/pat/set_memory.c:1943 bpf_jit_binary_lock_ro include/linux/filter.h:892 [inline] bpf_int_jit_compile+0xbf36/0xc6c0 arch/x86/net/bpf_jit_comp.c:2422 bpf_prog_select_runtime+0x701/0x9f0 kernel/bpf/core.c:1934 bpf_prog_load+0x131c/0x1b60 kernel/bpf/syscall.c:2357 __sys_bpf+0x343/0x670 kernel/bpf/syscall.c:4656 __do_sys_bpf kernel/bpf/syscall.c:4760 [inline] __se_sys_bpf kernel/bpf/syscall.c:4758 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4758 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Memory state around the buggy address: ffff88805d707f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805d707f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805d708000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805d708080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805d708100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================