================================================================== 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 ffff888192dc3470 by task syz-executor.4/31204 CPU: 1 PID: 31204 Comm: syz-executor.4 Not tainted 5.15.141-syzkaller-00899-g28e3f5851a99 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 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:6814 __mem_cgroup_charge+0x37/0x130 mm/memcontrol.c:6850 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:3788 ext4_da_write_begin+0x5ae/0xc30 fs/ext4/inode.c:3003 generic_perform_write+0x2bc/0x5a0 mm/filemap.c:3834 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:2882 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_general_protection+0x327/0x4b0 arch/x86/kernel/traps.c:562 asm_exc_general_protection+0x27/0x30 arch/x86/include/asm/idtentry.h:562 RIP: 0033:0x7fe3b629dcf1 Code: c4 28 c3 e8 e1 20 00 00 90 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 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:0000000020000240 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007fe3b63bcf80 RCX: 00007fe3b629dce9 RDX: 0000000020000100 RSI: 0000000020000240 RDI: 0000000000000000 RBP: 00007fe3b62ea47a R08: 0000000020000180 R09: 0000000020000180 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fe3b63bcf80 R15: 00007ffde09ebfd8 Allocated by task 511: 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+0x13a/0x270 mm/slub.c:4427 __kmalloc_node include/linux/slab.h:469 [inline] kmalloc_node include/linux/slab.h:626 [inline] kvmalloc_node+0x1f0/0x4d0 mm/util.c:628 kvmalloc include/linux/mm.h:851 [inline] kvmalloc_array include/linux/mm.h:869 [inline] alloc_fdtable+0xeb/0x2a0 fs/file.c:136 dup_fd+0x759/0xb00 fs/file.c:354 copy_files+0xe6/0x200 kernel/fork.c:1620 copy_process+0x11f3/0x3260 kernel/fork.c:2252 kernel_clone+0x21e/0x9e0 kernel/fork.c:2662 __do_sys_clone kernel/fork.c:2788 [inline] __se_sys_clone kernel/fork.c:2772 [inline] __x64_sys_clone+0x23f/0x290 kernel/fork.c:2772 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 31227: 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 kvfree+0x35/0x40 mm/util.c:664 __free_fdtable fs/file.c:36 [inline] put_files_struct+0x284/0x320 fs/file.c:451 exit_files+0x80/0xa0 fs/file.c:464 do_exit+0xc11/0x2ca0 kernel/exit.c:873 do_group_exit+0x141/0x310 kernel/exit.c:1000 __do_sys_exit_group kernel/exit.c:1011 [inline] __se_sys_exit_group kernel/exit.c:1009 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1009 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 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+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 kvfree_call_rcu+0xb2/0x7d0 kernel/rcu/tree.c:3596 drop_sysctl_table+0x311/0x450 fs/proc/proc_sysctl.c:1682 unregister_sysctl_table+0x7b/0x120 fs/proc/proc_sysctl.c:1720 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:175 __addrconf_sysctl_unregister net/ipv6/addrconf.c:7153 [inline] addrconf_sysctl_unregister net/ipv6/addrconf.c:7181 [inline] addrconf_ifdown+0x178f/0x1ae0 net/ipv6/addrconf.c:3934 addrconf_notify+0x37d/0xdd0 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 net/core/dev.c:2051 [inline] unregister_netdevice_many+0xe0a/0x17c0 net/core/dev.c:11102 ip_tunnel_delete_nets+0x33b/0x380 net/ipv4/ip_tunnel.c:1123 ipgre_tap_exit_batch_net+0x22/0x30 net/ipv4/ip_gre.c:1703 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:337 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:3007 [inline] call_rcu+0x133/0x12a0 kernel/rcu/tree.c:3087 in6_dev_finish_destroy+0x15a/0x1b0 net/ipv6/addrconf_core.c:271 in6_dev_put include/net/addrconf.h:390 [inline] addrconf_ifdown+0x1893/0x1ae0 net/ipv6/addrconf.c:3937 addrconf_notify+0x37d/0xdd0 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 net/core/dev.c:2051 [inline] unregister_netdevice_many+0xe0a/0x17c0 net/core/dev.c:11102 ip6_tnl_exit_batch_net+0x3c4/0x410 net/ipv6/ip6_tunnel.c:2312 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:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 The buggy address belongs to the object at ffff888192dc3000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1136 bytes inside of 2048-byte region [ffff888192dc3000, ffff888192dc3800) The buggy address belongs to the page: page:ffffea00064b7000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x192dc0 head:ffffea00064b7000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 dead000000000100 dead000000000122 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 20068, ts 797683808264, free_ts 788697518934 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2604 prep_new_page+0x1b/0x110 mm/page_alloc.c:2610 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4484 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5776 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+0x16d/0x270 mm/slub.c:4423 __kmalloc_node include/linux/slab.h:469 [inline] kmalloc_node include/linux/slab.h:626 [inline] kvmalloc_node+0x1f0/0x4d0 mm/util.c:628 kvmalloc include/linux/mm.h:851 [inline] kvmalloc_array include/linux/mm.h:869 [inline] alloc_fdtable+0xeb/0x2a0 fs/file.c:136 dup_fd+0x759/0xb00 fs/file.c:354 copy_files+0xe6/0x200 kernel/fork.c:1620 copy_process+0x11f3/0x3260 kernel/fork.c:2252 kernel_clone+0x21e/0x9e0 kernel/fork.c:2662 __do_sys_clone kernel/fork.c:2788 [inline] __se_sys_clone kernel/fork.c:2772 [inline] __x64_sys_clone+0x23f/0x290 kernel/fork.c:2772 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1471 [inline] free_pcp_prepare mm/page_alloc.c:1543 [inline] free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3533 free_unref_page+0xe8/0x750 mm/page_alloc.c:3615 free_the_page mm/page_alloc.c:804 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:5852 __free_slab+0xec/0x1d0 mm/slub.c:2020 free_slab mm/slub.c:2035 [inline] discard_slab+0x29/0x40 mm/slub.c:2041 __slab_free+0x205/0x290 mm/slub.c:3424 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 getname_flags+0xba/0x520 fs/namei.c:138 user_path_at_empty+0x2d/0x1a0 fs/namei.c:2852 user_path_at include/linux/namei.h:57 [inline] inotify_find_inode fs/notify/inotify/inotify_user.c:355 [inline] __do_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:758 [inline] __se_sys_inotify_add_watch+0x1c0/0xc00 fs/notify/inotify/inotify_user.c:709 Memory state around the buggy address: ffff888192dc3300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888192dc3380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888192dc3400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888192dc3480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888192dc3500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== syz-executor.4 (31204) used greatest stack depth: 17152 bytes left