================================================================== BUG: KASAN: use-after-free in cleancache_fs_enabled_mapping include/linux/cleancache.h:56 [inline] BUG: KASAN: use-after-free in cleancache_invalidate_page include/linux/cleancache.h:110 [inline] BUG: KASAN: use-after-free in unaccount_page_cache_page+0x99f/0xa80 mm/filemap.c:175 Read of size 4 at addr ffff8881230cb470 by task syz.3.6439/23083 CPU: 0 PID: 23083 Comm: syz.3.6439 Not tainted 5.10.223-syzkaller-01561-g0890c03b8b7d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:452 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 cleancache_fs_enabled_mapping include/linux/cleancache.h:56 [inline] cleancache_invalidate_page include/linux/cleancache.h:110 [inline] unaccount_page_cache_page+0x99f/0xa80 mm/filemap.c:175 __delete_from_page_cache+0xd0/0x5d0 mm/filemap.c:243 __remove_mapping+0x567/0x690 mm/vmscan.c:978 shrink_page_list+0x1f38/0x4c60 mm/vmscan.c:1491 shrink_inactive_list+0x591/0x1150 mm/vmscan.c:2068 shrink_list mm/vmscan.c:2287 [inline] shrink_lruvec+0xced/0x3860 mm/vmscan.c:5466 shrink_node_memcgs mm/vmscan.c:5653 [inline] shrink_node+0xded/0x2000 mm/vmscan.c:5683 shrink_zones mm/vmscan.c:5889 [inline] do_try_to_free_pages+0x652/0x1630 mm/vmscan.c:5947 try_to_free_mem_cgroup_pages+0x369/0x830 mm/vmscan.c:6265 try_charge+0x4b8/0x15f0 mm/memcontrol.c:2742 __mem_cgroup_charge+0x147/0x6e0 mm/memcontrol.c:6848 mem_cgroup_charge include/linux/memcontrol.h:458 [inline] shmem_add_to_page_cache+0x6a9/0x10c0 mm/shmem.c:699 shmem_getpage_gfp+0xa65/0x2480 mm/shmem.c:1952 shmem_getpage mm/shmem.c:161 [inline] shmem_write_begin+0xca/0x1b0 mm/shmem.c:2500 generic_perform_write+0x2cd/0x570 mm/filemap.c:3509 __generic_file_write_iter+0x23c/0x560 mm/filemap.c:3638 generic_file_write_iter+0xaf/0x1c0 mm/filemap.c:3670 __kernel_write+0x5ab/0x9d0 fs/read_write.c:550 dump_emit+0x261/0x3a0 fs/coredump.c:849 dump_user_range+0x71/0x1a0 fs/coredump.c:902 elf_core_dump+0x33bd/0x3c10 fs/binfmt_elf.c:2287 do_coredump+0x1eb8/0x2d60 fs/coredump.c:811 get_signal+0x102c/0x1410 kernel/signal.c:2768 arch_do_signal_or_restart+0xbd/0x17c0 arch/x86/kernel/signal.c:805 handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop+0x9b/0xd0 kernel/entry/common.c:169 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] irqentry_exit_to_user_mode+0x4e/0x80 kernel/entry/common.c:287 irqentry_exit+0x12/0x60 kernel/entry/common.c:375 exc_page_fault+0x33d/0x5b0 arch/x86/mm/fault.c:1487 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571 RIP: 0033:0x7f4d003f1307 Code: 88 15 ea 93 e0 00 88 05 e7 93 e0 00 c3 50 48 8d 35 f6 b5 1a 00 48 8d 3d fc b5 1a 00 31 c0 e8 a0 f9 ff ff 53 89 fb 48 83 ec 10 <64> 8b 04 25 94 ff ff ff 85 c0 74 2a 89 fe 31 c0 bf 3c 00 00 00 e8 RSP: 002b:00007f4cfef28120 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007f4d0052e9f9 RDX: 00007f4cfef28140 RSI: 00007f4cfef28270 RDI: 000000000000000b RBP: 00007f4d0059c8ee R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f4d006cb208 R15: 00007ffd9f1bc9c8 Allocated by task 19601: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:430 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:509 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x1aa/0x330 mm/slub.c:4033 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:664 [inline] ops_init+0x8e/0x4a0 net/core/net_namespace.c:134 setup_net+0x367/0xbf0 net/core/net_namespace.c:345 copy_net_ns+0x32f/0x520 net/core/net_namespace.c:486 create_new_namespaces+0x410/0x660 kernel/nsproxy.c:110 copy_namespaces+0x1d1/0x220 kernel/nsproxy.c:179 copy_process+0x11a0/0x3340 kernel/fork.c:2186 kernel_clone+0x21e/0x9e0 kernel/fork.c:2574 __do_sys_clone kernel/fork.c:2700 [inline] __se_sys_clone kernel/fork.c:2684 [inline] __x64_sys_clone+0x23f/0x290 kernel/fork.c:2684 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 22591: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1595 [inline] slab_free_freelist_hook+0xc0/0x190 mm/slub.c:1621 slab_free mm/slub.c:3203 [inline] kfree+0xc3/0x270 mm/slub.c:4191 skb_free_head net/core/skbuff.c:606 [inline] skb_release_data+0x5c6/0x6f0 net/core/skbuff.c:626 skb_release_all net/core/skbuff.c:680 [inline] __kfree_skb net/core/skbuff.c:694 [inline] kfree_skb+0xb9/0x320 net/core/skbuff.c:713 neigh_connected_output+0x427/0x450 net/core/neighbour.c:1541 neigh_output include/net/neighbour.h:517 [inline] ip_finish_output2+0xb7a/0xfc0 net/ipv4/ip_output.c:237 ip_do_fragment+0xc22/0x2310 net/ipv4/ip_output.c:921 ip_fragment+0x123/0x210 __ip_finish_output+0x557/0x740 net/ipv4/ip_output.c:313 ip_finish_output+0x34/0x1e0 net/ipv4/ip_output.c:325 NF_HOOK_COND include/linux/netfilter.h:288 [inline] ip_mc_output+0x3d3/0xa30 net/ipv4/ip_output.c:424 dst_output include/net/dst.h:437 [inline] ip_local_out+0x92/0xb0 net/ipv4/ip_output.c:126 iptunnel_xmit+0x470/0x850 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x1e64/0x2760 net/ipv4/ip_tunnel.c:824 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x87a/0xc30 net/ipv4/ip_gre.c:664 __netdev_start_xmit include/linux/netdevice.h:4858 [inline] netdev_start_xmit include/linux/netdevice.h:4872 [inline] xmit_one net/core/dev.c:3607 [inline] dev_hard_start_xmit+0x228/0x620 net/core/dev.c:3623 __dev_queue_xmit+0x16f1/0x28e0 net/core/dev.c:4190 dev_queue_xmit+0x17/0x20 net/core/dev.c:4223 __bpf_tx_skb net/core/filter.c:2120 [inline] __bpf_redirect_no_mac net/core/filter.c:2154 [inline] __bpf_redirect+0x665/0xde0 net/core/filter.c:2177 ____bpf_clone_redirect net/core/filter.c:2461 [inline] bpf_clone_redirect+0x24d/0x390 net/core/filter.c:2433 0xffffffffa00165e6 bpf_dispatcher_nop_func include/linux/bpf.h:669 [inline] bpf_test_run+0x40b/0xc20 net/bpf/test_run.c:116 bpf_prog_test_run_skb+0xb6e/0x1410 net/bpf/test_run.c:635 bpf_prog_test_run kernel/bpf/syscall.c:3156 [inline] __do_sys_bpf kernel/bpf/syscall.c:4453 [inline] __se_sys_bpf+0x5235/0x11cb0 kernel/bpf/syscall.c:4391 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:4391 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2976 [inline] call_rcu+0x135/0x11f0 kernel/rcu/tree.c:3050 netlink_release+0x12df/0x16f0 net/netlink/af_netlink.c:811 __sock_release net/socket.c:597 [inline] sock_release+0x7e/0x140 net/socket.c:625 netlink_kernel_release+0x4d/0x60 net/netlink/af_netlink.c:2104 nl_fib_lookup_exit net/ipv4/fib_frontend.c:1409 [inline] fib_net_exit+0x4b/0x80 net/ipv4/fib_frontend.c:1614 ops_exit_list net/core/net_namespace.c:185 [inline] cleanup_net+0x66c/0xcb0 net/core/net_namespace.c:609 process_one_work+0x6dc/0xbd0 kernel/workqueue.c:2301 worker_thread+0xaea/0x1510 kernel/workqueue.c:2447 kthread+0x34b/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2976 [inline] call_rcu+0x135/0x11f0 kernel/rcu/tree.c:3050 netlink_release+0x12df/0x16f0 net/netlink/af_netlink.c:811 __sock_release net/socket.c:597 [inline] sock_release+0x7e/0x140 net/socket.c:625 netlink_kernel_release+0x4d/0x60 net/netlink/af_netlink.c:2104 nfnetlink_net_exit_batch+0xd3/0x110 net/netfilter/nfnetlink.c:649 ops_exit_list net/core/net_namespace.c:190 [inline] cleanup_net+0x6e9/0xcb0 net/core/net_namespace.c:609 process_one_work+0x6dc/0xbd0 kernel/workqueue.c:2301 worker_thread+0xaea/0x1510 kernel/workqueue.c:2447 kthread+0x34b/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 The buggy address belongs to the object at ffff8881230cb000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1136 bytes inside of 2048-byte region [ffff8881230cb000, ffff8881230cb800) The buggy address belongs to the page: page:ffffea00048c3200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8881230c9000 pfn:0x1230c8 head:ffffea00048c3200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 ffffea00047a7a08 ffffea0005701608 ffff888100042d80 raw: ffff8881230c9000 0000000000080007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 285, ts 20108417294, free_ts 0 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348 allocate_slab mm/slub.c:1808 [inline] new_slab+0x80/0x400 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x302/0x4b0 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] __kmalloc_track_caller+0x1f8/0x320 mm/slub.c:4536 kmemdup+0x24/0x50 mm/util.c:131 neigh_sysctl_register+0xb0/0x530 net/core/neighbour.c:3647 addrconf_sysctl_register+0xae/0x1a0 net/ipv6/addrconf.c:7078 ipv6_add_dev+0xc11/0x10b0 net/ipv6/addrconf.c:448 addrconf_notify+0x58e/0xe90 net/ipv6/addrconf.c:3566 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x8c/0xf0 kernel/notifier.c:410 call_netdevice_notifiers_info net/core/dev.c:2054 [inline] call_netdevice_notifiers_extack net/core/dev.c:2066 [inline] call_netdevice_notifiers+0x145/0x1b0 net/core/dev.c:2080 register_netdevice+0x1066/0x13f0 net/core/dev.c:10067 veth_newlink+0x835/0xb50 drivers/net/veth.c:1387 page_owner free stack trace missing Memory state around the buggy address: ffff8881230cb300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881230cb380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881230cb400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881230cb480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881230cb500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================