================================================================== 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+0x99f/0xa80 mm/filemap.c:175 Read of size 4 at addr ffff888156a5a470 by task syz-executor.4/32737 CPU: 1 PID: 32737 Comm: syz-executor.4 Not tainted 5.10.186-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x179/0x1c0 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+0x99f/0xa80 mm/filemap.c:175 __delete_from_page_cache+0xd0/0x5d0 mm/filemap.c:243 __remove_mapping+0x567/0x690 mm/vmscan.c:978 shrink_page_list+0x1f38/0x4c60 mm/vmscan.c:1491 shrink_inactive_list+0x591/0x1150 mm/vmscan.c:2048 shrink_list mm/vmscan.c:2267 [inline] shrink_lruvec+0xced/0x3860 mm/vmscan.c:5408 shrink_node_memcgs mm/vmscan.c:5595 [inline] shrink_node+0xdf3/0x1fb0 mm/vmscan.c:5625 shrink_zones mm/vmscan.c:5828 [inline] do_try_to_free_pages+0x67e/0x15e0 mm/vmscan.c:5886 try_to_free_mem_cgroup_pages+0x369/0x830 mm/vmscan.c:6204 try_charge+0x4b8/0x15f0 mm/memcontrol.c:2742 __mem_cgroup_charge+0x147/0x6e0 mm/memcontrol.c:6847 mem_cgroup_charge include/linux/memcontrol.h:458 [inline] __add_to_page_cache_locked+0x29d/0xba0 mm/filemap.c:854 add_to_page_cache_lru+0x117/0x2c0 mm/filemap.c:948 pagecache_get_page+0x71e/0x950 mm/filemap.c:1859 grab_cache_page_write_begin+0x5d/0xa0 mm/filemap.c:3456 ext4_da_write_begin+0x587/0xf60 fs/ext4/inode.c:3065 generic_perform_write+0x2cd/0x570 mm/filemap.c:3506 ext4_buffered_write_iter+0x482/0x610 fs/ext4/file.c:271 ext4_file_write_iter+0x193/0x1c80 fs/ext4/file.c:685 __kernel_write+0x5ab/0x9d0 fs/read_write.c:550 dump_emit+0x261/0x3a0 fs/coredump.c:849 dump_user_range+0x71/0x1a0 fs/coredump.c:902 elf_core_dump+0x33bd/0x3c10 fs/binfmt_elf.c:2287 do_coredump+0x1eb8/0x2d60 fs/coredump.c:811 get_signal+0x102c/0x1410 kernel/signal.c:2768 arch_do_signal_or_restart+0xbd/0x17c0 arch/x86/kernel/signal.c:805 handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop+0x9b/0xd0 kernel/entry/common.c:169 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] irqentry_exit_to_user_mode+0x55/0x80 kernel/entry/common.c:287 irqentry_exit+0x12/0x60 kernel/entry/common.c:375 exc_general_protection+0x415/0x490 arch/x86/kernel/traps.c:557 asm_exc_general_protection+0x1e/0x30 arch/x86/include/asm/idtentry.h:565 RIP: 0033:0x7f8f7713fb31 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:0000000020000150 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f8f7725f050 RCX: 00007f8f7713fb29 RDX: 0000000020000180 RSI: 0000000020000150 RDI: 0000000004020000 RBP: 00007f8f7718b47a R08: 0000000020001140 R09: 0000000020001140 R10: 00000000200001c0 R11: 0000000000000206 R12: 0000000000000000 R13: 000000000000000b R14: 00007f8f7725f050 R15: 00007ffe3f7db4d8 Allocated by task 32072: 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:430 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:509 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] kmem_cache_alloc_trace+0x18a/0x2e0 mm/slub.c:2974 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] do_check_common+0x184/0x1240 kernel/bpf/verifier.c:11838 do_check_main kernel/bpf/verifier.c:11941 [inline] bpf_check+0xb5b8/0xf2b0 kernel/bpf/verifier.c:12496 bpf_prog_load kernel/bpf/syscall.c:2233 [inline] __do_sys_bpf kernel/bpf/syscall.c:4429 [inline] __se_sys_bpf+0x107a2/0x11cb0 kernel/bpf/syscall.c:4385 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:4385 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xc6 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2975 [inline] call_rcu+0x135/0x11f0 kernel/rcu/tree.c:3049 netlink_release+0x12df/0x16f0 net/netlink/af_netlink.c:811 __sock_release net/socket.c:597 [inline] sock_close+0xdf/0x270 net/socket.c:1267 __fput+0x309/0x760 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x129/0x190 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] syscall_exit_to_user_mode+0xbc/0x1d0 kernel/entry/common.c:274 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xc6 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2975 [inline] call_rcu+0x135/0x11f0 kernel/rcu/tree.c:3049 netlink_release+0x12df/0x16f0 net/netlink/af_netlink.c:811 __sock_release net/socket.c:597 [inline] sock_close+0xdf/0x270 net/socket.c:1267 __fput+0x309/0x760 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x129/0x190 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xc83/0x2a50 kernel/exit.c:861 do_group_exit+0x141/0x310 kernel/exit.c:983 get_signal+0x10a0/0x1410 kernel/signal.c:2782 arch_do_signal_or_restart+0xbd/0x17c0 arch/x86/kernel/signal.c:805 handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop+0x9b/0xd0 kernel/entry/common.c:169 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] syscall_exit_to_user_mode+0xbc/0x1d0 kernel/entry/common.c:274 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xc6 The buggy address belongs to the object at ffff888156a5a000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1136 bytes inside of 2048-byte region [ffff888156a5a000, ffff888156a5a800) The buggy address belongs to the page: page:ffffea00055a9600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888156a5f000 pfn:0x156a58 head:ffffea00055a9600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 ffffea00055cda08 ffffea00059da608 ffff888100042d80 raw: ffff888156a5f000 0000000000080004 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 430, ts 138712617553, free_ts 0 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2455 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2461 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4253 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5345 allocate_slab mm/slub.c:1808 [inline] new_slab+0x80/0x400 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x302/0x4b0 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] __kmalloc_track_caller+0x1f8/0x320 mm/slub.c:4536 kmemdup+0x24/0x50 mm/util.c:131 neigh_sysctl_register+0xb0/0x530 net/core/neighbour.c:3635 devinet_sysctl_register+0xaa/0x1e0 net/ipv4/devinet.c:2609 inetdev_init+0x25f/0x460 net/ipv4/devinet.c:276 inetdev_event+0x205/0x1040 net/ipv4/devinet.c:1531 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x8c/0xf0 kernel/notifier.c:410 call_netdevice_notifiers_info net/core/dev.c:2054 [inline] call_netdevice_notifiers_extack net/core/dev.c:2066 [inline] call_netdevice_notifiers+0x145/0x1b0 net/core/dev.c:2080 register_netdevice+0x1066/0x13f0 net/core/dev.c:10059 veth_newlink+0x670/0xb70 drivers/net/veth.c:1361 page_owner free stack trace missing Memory state around the buggy address: ffff888156a5a300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888156a5a380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888156a5a400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888156a5a480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888156a5a500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================