================================================================== 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+0x6e0/0x750 mm/filemap.c:163 Read of size 4 at addr ffff88811e5ad470 by task syslogd/164 CPU: 0 PID: 164 Comm: syslogd Tainted: G W 5.15.74-syzkaller-00001-g4ec71a9ec769 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description+0x87/0x3d0 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x1a6/0x1f0 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+0x6e0/0x750 mm/filemap.c:163 __delete_from_page_cache+0xd2/0x5f0 mm/filemap.c:231 __remove_mapping+0x56b/0x690 mm/vmscan.c:1198 shrink_page_list+0x269a/0x4410 mm/vmscan.c:1775 shrink_inactive_list+0x373/0xb60 mm/vmscan.c:2310 shrink_list mm/vmscan.c:2542 [inline] shrink_lruvec+0x4e8/0xbe0 mm/vmscan.c:5605 shrink_node_memcgs+0x43e/0xa10 mm/vmscan.c:5799 shrink_node+0x2a4/0xfa0 mm/vmscan.c:5829 shrink_zones+0x496/0x9e0 mm/vmscan.c:6032 do_try_to_free_pages+0x1d9/0xd00 mm/vmscan.c:6090 try_to_free_pages+0x60c/0xdb0 mm/vmscan.c:6325 __perform_reclaim mm/page_alloc.c:4745 [inline] __alloc_pages_direct_reclaim+0x1a7/0x510 mm/page_alloc.c:4768 __alloc_pages_slowpath+0xc14/0x1bc0 mm/page_alloc.c:5179 __alloc_pages+0x50b/0x7c0 mm/page_alloc.c:5561 __alloc_pages_node include/linux/gfp.h:591 [inline] alloc_pages_node include/linux/gfp.h:605 [inline] alloc_pages include/linux/gfp.h:618 [inline] __page_cache_alloc include/linux/pagemap.h:305 [inline] pagecache_get_page+0xa60/0xdb0 mm/filemap.c:1940 find_or_create_page include/linux/pagemap.h:418 [inline] grow_dev_page fs/buffer.c:949 [inline] grow_buffers fs/buffer.c:1014 [inline] __getblk_slow fs/buffer.c:1041 [inline] __getblk_gfp+0x222/0x7d0 fs/buffer.c:1336 sb_getblk include/linux/buffer_head.h:361 [inline] ext4_getblk+0x256/0x6f0 fs/ext4/inode.c:858 ext4_bread_batch+0x61/0x520 fs/ext4/inode.c:925 __ext4_find_entry+0x104e/0x1b90 fs/ext4/namei.c:1646 ext4_lookup_entry fs/ext4/namei.c:1747 [inline] ext4_lookup+0x3de/0xb20 fs/ext4/namei.c:1815 __lookup_slow+0x2b3/0x400 fs/namei.c:1659 lookup_slow+0x5a/0x80 fs/namei.c:1676 walk_component+0x425/0x5a0 fs/namei.c:1972 link_path_walk+0x682/0xde0 path_openat+0x26a/0x2ea0 fs/namei.c:3611 do_filp_open+0x277/0x4f0 fs/namei.c:3642 do_sys_openat2+0x13b/0x500 fs/open.c:1237 do_sys_open fs/open.c:1253 [inline] __do_sys_openat fs/open.c:1269 [inline] __se_sys_openat fs/open.c:1264 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1264 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fa815f35697 Code: Unable to access opcode bytes at RIP 0x7fa815f3566d. RSP: 002b:00007ffffe90e940 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000558e30d662c0 RCX: 00007fa815f35697 RDX: 0000000000000d41 RSI: 00007fa8160c399a RDI: 00000000ffffff9c RBP: 00007fa8160c399a R08: 00007fa815fc5040 R09: 00007fa815fc50c0 R10: 00000000000001b6 R11: 0000000000000246 R12: 0000000000000d41 R13: 0000558e30d66400 R14: 0000000000000006 R15: 0000558e30d66410 Allocated by task 9261: 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+0xdc/0x110 mm/kasan/common.c:512 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x203/0x350 mm/slub.c:4423 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] __register_sysctl_table+0xee/0x1330 fs/proc/proc_sysctl.c:1320 register_net_sysctl+0x239/0x250 net/sysctl_net.c:169 __addrconf_sysctl_register+0x26e/0x3c0 net/ipv6/addrconf.c:7082 addrconf_sysctl_register+0x141/0x1a0 net/ipv6/addrconf.c:7129 ipv6_add_dev+0xc75/0x1120 net/ipv6/addrconf.c:455 addrconf_notify+0x584/0xec0 net/ipv6/addrconf.c:3550 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x9e/0x110 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2005 [inline] call_netdevice_notifiers_extack net/core/dev.c:2017 [inline] call_netdevice_notifiers+0x14e/0x1d0 net/core/dev.c:2031 register_netdevice+0x13bb/0x1720 net/core/dev.c:10363 register_netdev+0x3c/0x50 net/core/dev.c:10456 vti6_init_net+0x2b6/0x370 net/ipv6/ip6_vti.c:1164 ops_init+0x19e/0x390 net/core/net_namespace.c:134 setup_net+0x34b/0xbb0 net/core/net_namespace.c:322 copy_net_ns+0x359/0x5c0 net/core/net_namespace.c:466 create_new_namespaces+0x3d8/0x6e0 kernel/nsproxy.c:110 copy_namespaces+0x1d1/0x220 kernel/nsproxy.c:178 copy_process+0x12dd/0x3250 kernel/fork.c:2248 kernel_clone+0x22d/0x990 kernel/fork.c:2646 __do_sys_clone3 kernel/fork.c:2930 [inline] __se_sys_clone3 kernel/fork.c:2914 [inline] __x64_sys_clone3+0x375/0x3a0 kernel/fork.c:2914 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 1058: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/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:220 [inline] slab_free_hook mm/slub.c:1721 [inline] slab_free_freelist_hook+0xc9/0x1a0 mm/slub.c:1747 slab_free mm/slub.c:3515 [inline] kmem_cache_free_bulk+0x3dc/0x720 mm/slub.c:3656 kfree_bulk include/linux/slab.h:448 [inline] kfree_rcu_work+0x2cb/0x6c0 kernel/rcu/tree.c:3281 process_one_work+0x6db/0xc00 kernel/workqueue.c:2313 worker_thread+0xb3e/0x1340 kernel/workqueue.c:2460 kthread+0x41c/0x500 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 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+0xb2/0x7f0 kernel/rcu/tree.c:3558 drop_sysctl_table+0x31c/0x460 fs/proc/proc_sysctl.c:1649 unregister_sysctl_table+0x7d/0x130 fs/proc/proc_sysctl.c:1687 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:175 __addrconf_sysctl_unregister net/ipv6/addrconf.c:7111 [inline] addrconf_sysctl_unregister net/ipv6/addrconf.c:7139 [inline] addrconf_ifdown+0x1885/0x1be0 net/ipv6/addrconf.c:3921 addrconf_notify+0x372/0xec0 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x9e/0x110 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2005 [inline] call_netdevice_notifiers_extack net/core/dev.c:2017 [inline] call_netdevice_notifiers net/core/dev.c:2031 [inline] unregister_netdevice_many+0xeee/0x1920 net/core/dev.c:11078 vti6_exit_batch_net+0x29b/0x2e0 net/ipv6/ip6_vti.c:1190 ops_exit_list net/core/net_namespace.c:167 [inline] cleanup_net+0x76d/0xce0 net/core/net_namespace.c:589 process_one_work+0x6db/0xc00 kernel/workqueue.c:2313 worker_thread+0xb3e/0x1340 kernel/workqueue.c:2460 kthread+0x41c/0x500 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 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 kvfree_call_rcu+0xb2/0x7f0 kernel/rcu/tree.c:3558 drop_sysctl_table+0x31c/0x460 fs/proc/proc_sysctl.c:1649 unregister_sysctl_table+0x7d/0x130 fs/proc/proc_sysctl.c:1687 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:175 __addrconf_sysctl_unregister net/ipv6/addrconf.c:7111 [inline] addrconf_exit_net+0xa1/0x200 net/ipv6/addrconf.c:7218 ops_exit_list net/core/net_namespace.c:162 [inline] cleanup_net+0x6d5/0xce0 net/core/net_namespace.c:589 process_one_work+0x6db/0xc00 kernel/workqueue.c:2313 worker_thread+0xb3e/0x1340 kernel/workqueue.c:2460 kthread+0x41c/0x500 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 The buggy address belongs to the object at ffff88811e5ad000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1136 bytes inside of 2048-byte region [ffff88811e5ad000, ffff88811e5ad800) The buggy address belongs to the page: page:ffffea0004796a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11e5a8 head:ffffea0004796a00 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 4321, ts 530247021342, free_ts 530193004464 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1ab/0x1b0 mm/page_alloc.c:2495 prep_new_page mm/page_alloc.c:2501 [inline] get_page_from_freelist+0x38b/0x400 mm/page_alloc.c:4281 __alloc_pages+0x3a8/0x7c0 mm/page_alloc.c:5548 allocate_slab+0x62/0x580 mm/slub.c:1928 new_slab mm/slub.c:1991 [inline] ___slab_alloc+0x2e2/0x6f0 mm/slub.c:3024 __slab_alloc+0x4a/0x90 mm/slub.c:3111 slab_alloc_node mm/slub.c:3202 [inline] slab_alloc mm/slub.c:3244 [inline] __kmalloc+0x25b/0x350 mm/slub.c:4419 __kmalloc_node include/linux/slab.h:457 [inline] kmalloc_node include/linux/slab.h:614 [inline] kvmalloc_node+0x82/0x130 mm/util.c:623 kvmalloc include/linux/mm.h:844 [inline] kvmalloc_array include/linux/mm.h:862 [inline] alloc_fdtable+0xea/0x2b0 fs/file.c:136 dup_fd+0x781/0xa40 fs/file.c:354 copy_files+0xe6/0x200 kernel/fork.c:1601 copy_process+0x11e9/0x3250 kernel/fork.c:2233 kernel_clone+0x22d/0x990 kernel/fork.c:2646 __do_sys_clone kernel/fork.c:2772 [inline] __se_sys_clone kernel/fork.c:2756 [inline] __x64_sys_clone+0x289/0x310 kernel/fork.c:2756 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1364 [inline] free_pcp_prepare+0x448/0x450 mm/page_alloc.c:1435 free_unref_page_prepare mm/page_alloc.c:3433 [inline] free_unref_page+0x9c/0x370 mm/page_alloc.c:3513 free_the_page mm/page_alloc.c:706 [inline] __free_pages+0xd8/0x100 mm/page_alloc.c:5621 __free_slab+0xf0/0x1d0 mm/slub.c:2016 free_slab mm/slub.c:2031 [inline] discard_slab mm/slub.c:2037 [inline] __unfreeze_partials+0x17d/0x1b0 mm/slub.c:2523 put_cpu_partial+0xc4/0x120 mm/slub.c:2603 __slab_free+0x1c0/0x2f0 mm/slub.c:3384 do_slab_free mm/slub.c:3503 [inline] ___cache_free+0x112/0x130 mm/slub.c:3522 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x4c/0xc0 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:244 [inline] slab_post_alloc_hook mm/slab.h:550 [inline] slab_alloc_node mm/slub.c:3236 [inline] slab_alloc mm/slub.c:3244 [inline] kmem_cache_alloc+0x189/0x2f0 mm/slub.c:3249 kmem_cache_zalloc include/linux/slab.h:711 [inline] alloc_buffer_head+0x26/0x110 fs/buffer.c:3311 alloc_page_buffers+0x198/0x3a0 fs/buffer.c:832 create_empty_buffers+0x3d/0x4e0 fs/buffer.c:1562 Memory state around the buggy address: ffff88811e5ad300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811e5ad380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811e5ad400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811e5ad480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811e5ad500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================