================================================================== 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+0x6d8/0x750 mm/filemap.c:163 Read of size 4 at addr ffff88810def5470 by task syz-executor.2/31333 CPU: 1 PID: 31333 Comm: syz-executor.2 Not tainted 5.15.137-syzkaller-01792-g61cfd264993d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description+0x87/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:444 __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+0x6d8/0x750 mm/filemap.c:163 __delete_from_page_cache+0xc6/0x5b0 mm/filemap.c:231 __remove_mapping+0x566/0x690 mm/vmscan.c:1200 shrink_page_list+0x2723/0x5c50 mm/vmscan.c:1797 shrink_inactive_list mm/vmscan.c:2304 [inline] shrink_list mm/vmscan.c:2549 [inline] shrink_lruvec+0x17ec/0x4580 mm/vmscan.c:5752 shrink_node_memcgs mm/vmscan.c:5944 [inline] shrink_node+0x1077/0x24e0 mm/vmscan.c:5974 shrink_zones mm/vmscan.c:6177 [inline] do_try_to_free_pages+0x5b6/0x1570 mm/vmscan.c:6235 try_to_free_mem_cgroup_pages+0x36c/0x850 mm/vmscan.c:6549 try_charge_memcg+0x48f/0x1550 mm/memcontrol.c:2686 try_charge mm/memcontrol.c:2811 [inline] charge_memcg+0x6b/0x1a0 mm/memcontrol.c:6813 __mem_cgroup_charge+0x37/0x130 mm/memcontrol.c:6849 mem_cgroup_charge include/linux/memcontrol.h:715 [inline] __add_to_page_cache_locked+0x2d1/0xa20 mm/filemap.c:892 add_to_page_cache_lru+0x11b/0x2c0 mm/filemap.c:984 pagecache_get_page+0xbe1/0xeb0 mm/filemap.c:1951 grab_cache_page_write_begin+0x5d/0xa0 mm/filemap.c:3787 ext4_da_write_begin+0x5ae/0xc30 fs/ext4/inode.c:3003 generic_perform_write+0x2bc/0x5a0 mm/filemap.c:3833 ext4_buffered_write_iter+0x48a/0x610 fs/ext4/file.c:270 ext4_file_write_iter+0x443/0x1c80 __kernel_write+0x5ab/0xa60 fs/read_write.c:539 __dump_emit+0x261/0x3a0 fs/coredump.c:875 dump_emit+0x381/0x3f0 fs/coredump.c:912 dump_user_range+0x86/0x1c0 fs/coredump.c:949 elf_core_dump+0x3663/0x3e80 fs/binfmt_elf.c:2285 do_coredump+0x1834/0x3050 fs/coredump.c:826 get_signal+0x4c8/0x1630 kernel/signal.c:2877 arch_do_signal_or_restart+0xbd/0x1680 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop+0xa0/0xe0 kernel/entry/common.c:172 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:208 irqentry_exit_to_user_mode+0x9/0x20 kernel/entry/common.c:314 irqentry_exit+0x12/0x40 kernel/entry/common.c:405 exc_page_fault+0x47a/0x830 arch/x86/mm/fault.c:1608 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:568 RIP: 0033:0x247f9569ef82 Code: Unable to access opcode bytes at RIP 0x247f9569ef58. RSP: 002b:00000000200003a8 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f86b8077120 RCX: 00007f86b7f57ae9 RDX: 0000000020000180 RSI: 00000000200003a0 RDI: 0000000054002000 RBP: 00007f86b7fa347a R08: 00000000200003c0 R09: 00000000200003c0 R10: 00000000200001c0 R11: 0000000000000206 R12: 0000000000000000 R13: 000000000000000b R14: 00007f86b8077120 R15: 00007fff51a71788 Allocated by task 1025: 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:433 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:512 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc_track_caller+0x139/0x260 mm/slub.c:4950 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0x10c/0x550 net/core/skbuff.c:428 alloc_skb include/linux/skbuff.h:1183 [inline] nlmsg_new include/net/netlink.h:953 [inline] rtmsg_ifinfo_build_skb+0x7f/0x180 net/core/rtnetlink.c:3863 unregister_netdevice_many+0xea2/0x17c0 net/core/dev.c:11106 ip_tunnel_delete_nets+0x33b/0x380 net/ipv4/ip_tunnel.c:1123 vti_exit_batch_net+0x22/0x30 net/ipv4/ip_vti.c:515 ops_exit_list net/core/net_namespace.c:174 [inline] cleanup_net+0x6ce/0xc00 net/core/net_namespace.c:596 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2317 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2464 kthread+0x421/0x510 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Freed by task 1025: 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+0x126/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749 slab_free mm/slub.c:3519 [inline] kfree+0xc8/0x220 mm/slub.c:4579 skb_free_head net/core/skbuff.c:656 [inline] skb_release_data+0x8a9/0xa80 net/core/skbuff.c:678 skb_release_all net/core/skbuff.c:743 [inline] __kfree_skb net/core/skbuff.c:757 [inline] consume_skb+0xac/0x250 net/core/skbuff.c:930 netlink_broadcast_filtered+0x10f4/0x1220 net/netlink/af_netlink.c:1540 netlink_broadcast net/netlink/af_netlink.c:1562 [inline] nlmsg_multicast include/net/netlink.h:1033 [inline] nlmsg_notify+0x101/0x1c0 net/netlink/af_netlink.c:2548 rtnl_notify net/core/rtnetlink.c:730 [inline] rtmsg_ifinfo_send+0x79/0x90 net/core/rtnetlink.c:3887 unregister_netdevice_many+0x11d0/0x17c0 net/core/dev.c:11122 ip_tunnel_delete_nets+0x33b/0x380 net/ipv4/ip_tunnel.c:1123 vti_exit_batch_net+0x22/0x30 net/ipv4/ip_vti.c:515 ops_exit_list net/core/net_namespace.c:174 [inline] cleanup_net+0x6ce/0xc00 net/core/net_namespace.c:596 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2317 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2464 kthread+0x421/0x510 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2994 [inline] call_rcu+0x133/0x12a0 kernel/rcu/tree.c:3074 netlink_release+0x12df/0x16f0 net/netlink/af_netlink.c:819 __sock_release net/socket.c:649 [inline] sock_release+0x7e/0x140 net/socket.c:677 netlink_kernel_release+0x4d/0x60 net/netlink/af_netlink.c:2111 audit_net_exit+0x86/0x90 kernel/audit.c:1664 ops_exit_list net/core/net_namespace.c:169 [inline] cleanup_net+0x64b/0xc00 net/core/net_namespace.c:596 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2317 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2464 kthread+0x421/0x510 kernel/kthread.c:319 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+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2994 [inline] call_rcu+0x133/0x12a0 kernel/rcu/tree.c:3074 keypair_free_kref drivers/net/wireguard/noise.c:128 [inline] kref_put include/linux/kref.h:65 [inline] wg_noise_keypair_put+0xdb/0x190 drivers/net/wireguard/noise.c:139 add_new_keypair drivers/net/wireguard/noise.c:248 [inline] wg_noise_handshake_begin_session+0x4de/0x750 drivers/net/wireguard/noise.c:845 wg_packet_send_handshake_response+0x118/0x1f0 drivers/net/wireguard/send.c:96 wg_receive_handshake_packet drivers/net/wireguard/receive.c:161 [inline] wg_packet_handshake_receive_worker+0x570/0x930 drivers/net/wireguard/receive.c:220 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2317 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2464 kthread+0x421/0x510 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 The buggy address belongs to the object at ffff88810def5000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1136 bytes inside of 2048-byte region [ffff88810def5000, ffff88810def5800) The buggy address belongs to the page: page:ffffea000437bc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10def0 head:ffffea000437bc00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 0000000100000001 ffff888100043200 raw: 0000000000000000 0000000000080008 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 2768, ts 251425700899, free_ts 251419252973 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2602 prep_new_page+0x1b/0x110 mm/page_alloc.c:2608 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4482 __alloc_pages+0x206/0x5e0 mm/page_alloc.c:5773 allocate_slab mm/slub.c:1932 [inline] new_slab+0x9a/0x4e0 mm/slub.c:1995 ___slab_alloc+0x39e/0x830 mm/slub.c:3028 __slab_alloc+0x4a/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3248 [inline] __kmalloc_track_caller+0x16c/0x260 mm/slub.c:4945 kmemdup+0x24/0x50 mm/util.c:132 neigh_sysctl_register+0xb0/0x530 net/core/neighbour.c:3637 devinet_sysctl_register+0xaa/0x1e0 net/ipv4/devinet.c:2614 inetdev_init+0x284/0x4b0 net/ipv4/devinet.c:276 inetdev_event+0x205/0x1040 net/ipv4/devinet.c:1530 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x8c/0xf0 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2025 [inline] call_netdevice_notifiers_extack net/core/dev.c:2037 [inline] call_netdevice_notifiers+0x145/0x1b0 net/core/dev.c:2051 register_netdevice+0x1035/0x1390 net/core/dev.c:10389 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1469 [inline] free_pcp_prepare mm/page_alloc.c:1541 [inline] free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3531 free_unref_page+0xe6/0x730 mm/page_alloc.c:3613 free_the_page mm/page_alloc.c:802 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:5849 __free_slab+0xec/0x1d0 mm/slub.c:2020 free_slab mm/slub.c:2035 [inline] discard_slab mm/slub.c:2041 [inline] __unfreeze_partials+0x165/0x1a0 mm/slub.c:2527 put_cpu_partial+0xc4/0x120 mm/slub.c:2607 __slab_free+0x1c8/0x290 mm/slub.c:3388 do_slab_free mm/slub.c:3507 [inline] ___cache_free+0x109/0x120 mm/slub.c:3526 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x44/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x15a/0x180 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550 slab_alloc_node mm/slub.c:3240 [inline] slab_alloc mm/slub.c:3248 [inline] kmem_cache_alloc+0xf5/0x200 mm/slub.c:3253 vm_area_dup+0x26/0x230 kernel/fork.c:367 __split_vma+0xc0/0x480 mm/mmap.c:2749 Memory state around the buggy address: ffff88810def5300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810def5380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88810def5400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88810def5480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810def5500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== syz-executor.2 (31333) used greatest stack depth: 17120 bytes left