================================================================== BUG: KASAN: use-after-free in cleancache_fs_enabled_mapping include/linux/cleancache.h:54 [inline] BUG: KASAN: use-after-free in cleancache_invalidate_page include/linux/cleancache.h:108 [inline] BUG: KASAN: use-after-free in unaccount_page_cache_page+0x639/0x6b0 mm/filemap.c:169 Read of size 4 at addr ffff8881f0ac3488 by task syz-executor.4/25523 CPU: 1 PID: 25523 Comm: syz-executor.4 Not tainted 5.4.233-syzkaller-00011-g0108362f3305 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 print_address_description+0x8c/0x600 mm/kasan/report.c:384 __kasan_report+0xf3/0x120 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 cleancache_fs_enabled_mapping include/linux/cleancache.h:54 [inline] cleancache_invalidate_page include/linux/cleancache.h:108 [inline] unaccount_page_cache_page+0x639/0x6b0 mm/filemap.c:169 __delete_from_page_cache+0xc3/0x510 mm/filemap.c:237 __remove_mapping+0x46e/0x550 mm/vmscan.c:978 shrink_page_list+0x2467/0x3e70 mm/vmscan.c:1482 shrink_inactive_list+0x4f6/0xfd0 mm/vmscan.c:2001 shrink_list mm/vmscan.c:2293 [inline] shrink_node_memcg+0xc42/0x2430 mm/vmscan.c:2623 shrink_node+0x396/0x12b0 mm/vmscan.c:2836 shrink_zones mm/vmscan.c:3053 [inline] do_try_to_free_pages+0x625/0x1280 mm/vmscan.c:3111 try_to_free_mem_cgroup_pages+0x3f6/0x9b0 mm/vmscan.c:3412 memory_high_write+0x16a/0x1b0 mm/memcontrol.c:6173 cgroup_file_write+0x275/0x5c0 kernel/cgroup/cgroup.c:3898 kernfs_fop_write+0x2e2/0x3e0 fs/kernfs/file.c:315 __vfs_write+0x103/0x750 fs/read_write.c:494 vfs_write+0x206/0x4e0 fs/read_write.c:558 ksys_write+0x199/0x2c0 fs/read_write.c:611 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Allocated by task 25158: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x130/0x1d0 mm/kasan/common.c:529 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc_track_caller+0xfb/0x290 mm/slub.c:4449 kmemdup+0x21/0x50 mm/util.c:127 neigh_sysctl_register+0xb0/0x530 net/core/neighbour.c:3657 addrconf_sysctl_register+0xac/0x180 net/ipv6/addrconf.c:6988 ipv6_add_dev+0xc12/0x1070 net/ipv6/addrconf.c:445 addrconf_notify+0x59b/0xe50 net/ipv6/addrconf.c:3534 notifier_call_chain kernel/notifier.c:98 [inline] __raw_notifier_call_chain kernel/notifier.c:399 [inline] raw_notifier_call_chain+0x95/0x110 kernel/notifier.c:406 call_netdevice_notifiers_info net/core/dev.c:1670 [inline] call_netdevice_notifiers_extack net/core/dev.c:1682 [inline] call_netdevice_notifiers net/core/dev.c:1696 [inline] register_netdevice+0xeef/0x12a0 net/core/dev.c:9207 register_netdev+0x37/0x50 net/core/dev.c:9305 loopback_net_init+0x6f/0x140 drivers/net/loopback.c:214 ops_init+0x1d4/0x4a0 net/core/net_namespace.c:138 setup_net+0x214/0x990 net/core/net_namespace.c:345 copy_net_ns+0x30f/0x510 net/core/net_namespace.c:486 create_new_namespaces+0x47a/0x570 kernel/nsproxy.c:103 unshare_nsproxy_namespaces+0x119/0x170 kernel/nsproxy.c:202 ksys_unshare+0x544/0x990 kernel/fork.c:2901 __do_sys_unshare kernel/fork.c:2969 [inline] __se_sys_unshare kernel/fork.c:2967 [inline] __x64_sys_unshare+0x34/0x40 kernel/fork.c:2967 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 19805: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:345 [inline] __kasan_slab_free+0x178/0x230 mm/kasan/common.c:487 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook mm/slub.c:1494 [inline] slab_free mm/slub.c:3080 [inline] kfree+0xeb/0x320 mm/slub.c:4071 addrconf_sysctl_unregister net/ipv6/addrconf.c:7004 [inline] addrconf_ifdown+0x17e3/0x1a40 net/ipv6/addrconf.c:3905 addrconf_notify+0x375/0xe50 net/ipv6/addrconf.c:3676 notifier_call_chain kernel/notifier.c:98 [inline] __raw_notifier_call_chain kernel/notifier.c:399 [inline] raw_notifier_call_chain+0x95/0x110 kernel/notifier.c:406 call_netdevice_notifiers_info net/core/dev.c:1670 [inline] call_netdevice_notifiers_extack net/core/dev.c:1682 [inline] call_netdevice_notifiers net/core/dev.c:1696 [inline] rollback_registered_many+0xc8a/0x12e0 net/core/dev.c:8617 unregister_netdevice_many net/core/dev.c:9774 [inline] default_device_exit_batch+0x3e0/0x680 net/core/dev.c:10245 ops_exit_list net/core/net_namespace.c:184 [inline] cleanup_net+0x6e2/0xc90 net/core/net_namespace.c:609 process_one_work+0x765/0xd20 kernel/workqueue.c:2287 worker_thread+0xaef/0x1470 kernel/workqueue.c:2433 kthread+0x2da/0x360 kernel/kthread.c:288 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354 The buggy address belongs to the object at ffff8881f0ac3000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1160 bytes inside of 2048-byte region [ffff8881f0ac3000, ffff8881f0ac3800) The buggy address belongs to the page: page:ffffea0007c2b000 refcount:1 mapcount:0 mapping:ffff8881f5c0c000 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 0000000000000000 0000000100000001 ffff8881f5c0c000 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) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x18f/0x370 mm/page_alloc.c:2171 get_page_from_freelist+0x2ce8/0x2d70 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4891 alloc_slab_page+0x39/0x3c0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x97/0x440 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x2fe/0x490 mm/slub.c:2667 __slab_alloc+0x5a/0x90 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc+0x196/0x2b0 mm/slub.c:3909 __kmalloc_node include/linux/slab.h:422 [inline] kmalloc_node include/linux/slab.h:599 [inline] kvmalloc_node+0x7e/0xf0 mm/util.c:596 kvmalloc include/linux/mm.h:759 [inline] xt_alloc_table_info+0x39/0xa0 net/netfilter/x_tables.c:1172 do_replace net/ipv6/netfilter/ip6_tables.c:1143 [inline] do_ip6t_set_ctl+0x299/0x600 net/ipv6/netfilter/ip6_tables.c:1684 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x28f/0x2b0 net/netfilter/nf_sockopt.c:115 __sys_setsockopt+0x4b4/0x840 net/socket.c:2074 __do_sys_setsockopt net/socket.c:2090 [inline] __se_sys_setsockopt net/socket.c:2087 [inline] __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2087 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] __free_pages_ok+0x83d/0x940 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4953 [inline] __free_pages+0x91/0x140 mm/page_alloc.c:4959 free_thread_stack kernel/fork.c:299 [inline] release_task_stack kernel/fork.c:439 [inline] put_task_stack+0x212/0x260 kernel/fork.c:450 finish_task_switch+0x241/0x560 kernel/sched/core.c:3476 context_switch kernel/sched/core.c:3608 [inline] __schedule+0xb03/0x12a0 kernel/sched/core.c:4304 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:4453 preempt_schedule+0xd9/0xe0 kernel/sched/core.c:4478 ___preempt_schedule+0x16/0x20 arch/x86/entry/thunk_64.S:50 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] _raw_spin_unlock_irq+0x5c/0x60 kernel/locking/spinlock.c:199 spin_unlock_irq include/linux/spinlock.h:388 [inline] do_group_exit+0x242/0x300 kernel/exit.c:979 __do_sys_exit_group kernel/exit.c:993 [inline] __se_sys_exit_group kernel/exit.c:991 [inline] __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:991 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Memory state around the buggy address: ffff8881f0ac3380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881f0ac3400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881f0ac3480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881f0ac3500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881f0ac3580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================