================================================================== 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 ffff8881e9e98488 by task syz-executor.0/7045 CPU: 1 PID: 7045 Comm: syz-executor.0 Not tainted 5.4.233-syzkaller-00019-gd5ed2ca98e48 #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 try_charge+0x505/0x14e0 mm/memcontrol.c:2616 mem_cgroup_try_charge+0x249/0x370 mm/memcontrol.c:6582 wp_page_copy+0x2de/0x1820 mm/memory.c:2484 handle_pte_fault mm/memory.c:4043 [inline] __handle_mm_fault mm/memory.c:4151 [inline] handle_mm_fault+0xfec/0x3bb0 mm/memory.c:4188 do_user_addr_fault arch/x86/mm/fault.c:1469 [inline] __do_page_fault+0x509/0xbb0 arch/x86/mm/fault.c:1530 page_fault+0x2f/0x40 arch/x86/entry/entry_64.S:1206 Allocated by task 6835: 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 devinet_sysctl_register+0x9d/0x1a0 net/ipv4/devinet.c:2612 inetdev_init+0x24e/0x450 net/ipv4/devinet.c:276 inetdev_event+0x208/0x1030 net/ipv4/devinet.c:1531 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 vti6_init_net+0x2a4/0x350 net/ipv6/ip6_vti.c:1150 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 copy_namespaces+0x169/0x1b0 kernel/nsproxy.c:161 copy_process+0x12da/0x3230 kernel/fork.c:2047 _do_fork+0x197/0x900 kernel/fork.c:2396 __do_sys_clone kernel/fork.c:2554 [inline] __se_sys_clone kernel/fork.c:2535 [inline] __x64_sys_clone+0x26b/0x2c0 kernel/fork.c:2535 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 6475: 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 devinet_sysctl_unregister net/ipv4/devinet.c:2627 [inline] inetdev_destroy net/ipv4/devinet.c:324 [inline] inetdev_event+0x7aa/0x1030 net/ipv4/devinet.c:1599 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+0x46/0x250 net/core/dev.c:9774 vti6_exit_batch_net+0x260/0x2a0 net/ipv6/ip6_vti.c:1176 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 ffff8881e9e98000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1160 bytes inside of 2048-byte region [ffff8881e9e98000, ffff8881e9e98800) The buggy address belongs to the page: page:ffffea0007a7a600 refcount:1 mapcount:0 mapping:ffff8881f5c0c000 index:0xffff8881e9e9a000 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 ffffea0006948e08 ffffea00077eba08 ffff8881f5c0c000 raw: ffff8881e9e9a000 0000000000080002 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 include/linux/slab.h:561 [inline] kzalloc include/linux/slab.h:690 [inline] __register_sysctl_table+0xdb/0x11d0 fs/proc/proc_sysctl.c:1332 __addrconf_sysctl_register+0x28f/0x3e0 net/ipv6/addrconf.c:6945 addrconf_sysctl_register+0x128/0x180 net/ipv6/addrconf.c:6992 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 br_dev_newlink+0x23/0x100 net/bridge/br_netlink.c:1316 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_slab+0x221/0x2e0 mm/slub.c:1774 free_slab mm/slub.c:1789 [inline] discard_slab mm/slub.c:1795 [inline] unfreeze_partials+0x14e/0x180 mm/slub.c:2288 put_cpu_partial+0xb4/0x150 mm/slub.c:2324 __slab_free+0x288/0x350 mm/slub.c:2971 qlist_free_all+0x43/0xb0 mm/kasan/quarantine.c:167 quarantine_reduce+0x174/0x190 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x43/0x1d0 mm/kasan/common.c:507 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0xd0/0x220 mm/slub.c:2842 getname_flags+0xb8/0x4e0 fs/namei.c:141 getname fs/namei.c:212 [inline] do_renameat2+0x366/0x1110 fs/namei.c:4626 __do_sys_rename fs/namei.c:4754 [inline] __se_sys_rename fs/namei.c:4752 [inline] __x64_sys_rename+0x64/0x70 fs/namei.c:4752 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Memory state around the buggy address: ffff8881e9e98380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881e9e98400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881e9e98480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881e9e98500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881e9e98580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== syz-executor.0 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=1000 CPU: 1 PID: 7045 Comm: syz-executor.0 Tainted: G B 5.4.233-syzkaller-00019-gd5ed2ca98e48 #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 dump_header+0xd5/0x670 mm/oom_kill.c:460 oom_kill_process+0xeb/0x2c0 mm/oom_kill.c:974 out_of_memory+0x5e1/0x890 mm/oom_kill.c:1111 mem_cgroup_out_of_memory+0x211/0x270 mm/memcontrol.c:1611 mem_cgroup_oom mm/memcontrol.c:1943 [inline] try_charge+0xdf0/0x14e0 mm/memcontrol.c:2665 mem_cgroup_try_charge+0x249/0x370 mm/memcontrol.c:6582 wp_page_copy+0x2de/0x1820 mm/memory.c:2484 handle_pte_fault mm/memory.c:4043 [inline] __handle_mm_fault mm/memory.c:4151 [inline] handle_mm_fault+0xfec/0x3bb0 mm/memory.c:4188 do_user_addr_fault arch/x86/mm/fault.c:1469 [inline] __do_page_fault+0x509/0xbb0 arch/x86/mm/fault.c:1530 page_fault+0x2f/0x40 arch/x86/entry/entry_64.S:1206 memory: usage 8396kB, limit 0kB, failcnt 105 swap: usage 0kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz0: anon 745472 file 8114176 kernel_stack 0 slab 0 sock 0 shmem 8085504 file_mapped 135168 file_dirty 135168 file_writeback 0 anon_thp 0 inactive_anon 0 active_anon 8785920 inactive_file 131072 active_file 118784 unevictable 0 slab_reclaimable 0 slab_unreclaimable 0 pgfault 179520 pgmajfault 0 workingset_refault 0 workingset_activate 0 workingset_nodereclaim 0 pgrefill 357 pgscan 361 pgsteal 83 pgactivate 264 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=syz0,mems_allowed=0,oom_memcg=/syz0,task_memcg=/syz0,task=syz-executor.0,pid=321,uid=0 Memory cgroup out of memory: Killed process 321 (syz-executor.0) total-vm:48516kB, anon-rss:472kB, file-rss:15236kB, shmem-rss:4kB, UID:0 pgtables:88kB oom_score_adj:0