================================================================== 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+0x651/0x6c0 mm/filemap.c:169 Read of size 4 at addr ffff8881dada7488 by task syz-executor.2/12690 CPU: 1 PID: 12690 Comm: syz-executor.2 Not tainted 5.4.210-syzkaller-00003-g5a34019eb955 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18e/0x1d5 lib/dump_stack.c:118 print_address_description+0x8c/0x630 mm/kasan/report.c:384 __kasan_report+0xf6/0x130 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+0x651/0x6c0 mm/filemap.c:169 __delete_from_page_cache+0x69/0x450 mm/filemap.c:237 __remove_mapping+0x474/0x550 mm/vmscan.c:978 shrink_page_list+0x1dd5/0x3140 mm/vmscan.c:1478 shrink_inactive_list+0x4a7/0xea0 mm/vmscan.c:1997 shrink_list mm/vmscan.c:2288 [inline] shrink_node_memcg+0x501/0xf40 mm/vmscan.c:2618 shrink_node+0x364/0x1320 mm/vmscan.c:2831 shrink_zones+0x416/0x8b0 mm/vmscan.c:3048 do_try_to_free_pages+0x21b/0x990 mm/vmscan.c:3106 try_to_free_mem_cgroup_pages+0x32d/0x850 mm/vmscan.c:3407 try_charge+0x44a/0x1100 mm/memcontrol.c:2616 mem_cgroup_try_charge+0xd5/0x2a0 mm/memcontrol.c:6571 __add_to_page_cache_locked+0x1c1/0x820 mm/filemap.c:865 add_to_page_cache_lru+0xcf/0x260 mm/filemap.c:962 pagecache_get_page+0x539/0x760 mm/filemap.c:1701 grab_cache_page_write_begin+0x50/0x90 mm/filemap.c:3261 ext4_da_write_begin+0x52b/0xef0 fs/ext4/inode.c:3137 generic_perform_write+0x290/0x510 mm/filemap.c:3311 __generic_file_write_iter+0x239/0x490 mm/filemap.c:3440 ext4_file_write_iter+0x46e/0x1040 fs/ext4/file.c:270 call_write_iter include/linux/fs.h:1976 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0x4f9/0x6a0 fs/read_write.c:496 __kernel_write+0x12c/0x340 fs/read_write.c:515 dump_emit+0x1cc/0x2d0 fs/coredump.c:838 elf_core_dump+0x39f1/0x42a0 fs/binfmt_elf.c:2352 do_coredump+0x1d70/0x2ca0 fs/coredump.c:801 get_signal+0xd5b/0x13f0 kernel/signal.c:2729 do_signal+0x41/0x10a0 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0xdd/0x1d0 arch/x86/entry/common.c:159 prepare_exit_to_usermode+0x17c/0x1d0 arch/x86/entry/common.c:194 retint_user+0x8/0x8 RIP: 0033:0x7efe0f28a641 Code: 00 00 00 00 00 0f 1f 40 00 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 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:0000000000000030 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007efe0f3ab050 RCX: 00007efe0f28a639 RDX: 0000000000000000 RSI: 0000000000000030 RDI: 0000000000020000 RBP: 00007efe0f2e5a41 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ffc890f3c2f R14: 00007efe0dfdd300 R15: 0000000000022000 Allocated by task 12633: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x131/0x1e0 mm/kasan/common.c:529 kmalloc include/linux/slab.h:561 [inline] kzalloc include/linux/slab.h:690 [inline] __register_sysctl_table+0xe7/0x11c0 fs/proc/proc_sysctl.c:1331 __devinet_sysctl_register+0x1a4/0x240 net/ipv4/devinet.c:2575 devinet_sysctl_register+0x139/0x1a0 net/ipv4/devinet.c:2615 inetdev_init+0x24c/0x460 net/ipv4/devinet.c:276 inetdev_event+0x1cc/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+0x9d/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+0xd9e/0x1140 net/core/dev.c:9206 register_netdev+0x37/0x50 net/core/dev.c:9304 sit_init_net+0x228/0x420 net/ipv6/sit.c:1864 ops_init+0x278/0x350 net/core/net_namespace.c:137 setup_net+0x1bb/0x9e0 net/core/net_namespace.c:338 copy_net_ns+0x31a/0x510 net/core/net_namespace.c:479 create_new_namespaces+0x4e3/0x5f0 kernel/nsproxy.c:103 copy_namespaces+0x169/0x1b0 kernel/nsproxy.c:161 copy_process+0x12a4/0x31f0 kernel/fork.c:2044 _do_fork+0x142/0x7f0 kernel/fork.c:2391 __do_sys_clone kernel/fork.c:2549 [inline] __se_sys_clone kernel/fork.c:2530 [inline] __x64_sys_clone+0x213/0x260 kernel/fork.c:2530 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 12683: 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+0x178/0x240 mm/kasan/common.c:487 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook+0x80/0x150 mm/slub.c:1494 slab_free mm/slub.c:3080 [inline] kfree+0xc6/0x260 mm/slub.c:4071 __rcu_reclaim kernel/rcu/rcu.h:215 [inline] rcu_do_batch+0x3d9/0x910 kernel/rcu/tree.c:2167 rcu_core+0x448/0xbc0 kernel/rcu/tree.c:2387 __do_softirq+0x23e/0x643 kernel/softirq.c:292 The buggy address belongs to the object at ffff8881dada7000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1160 bytes inside of 2048-byte region [ffff8881dada7000, ffff8881dada7800) The buggy address belongs to the page: page:ffffea00076b6800 refcount:1 mapcount:0 mapping:ffff8881f5c0c000 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 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 0x1d2a20(GFP_ATOMIC|__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+0x194/0x380 mm/page_alloc.c:2171 get_page_from_freelist+0x524/0x560 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x2ab/0x6f0 mm/page_alloc.c:4857 alloc_slab_page+0x39/0x3e0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x97/0x450 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x320/0x4a0 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_track_caller+0x168/0x280 mm/slub.c:4449 __kmalloc_reserve net/core/skbuff.c:142 [inline] pskb_expand_head+0x118/0x1060 net/core/skbuff.c:1639 netlink_trim+0x194/0x230 net/netlink/af_netlink.c:1294 netlink_broadcast_filtered+0x6c/0x11d0 net/netlink/af_netlink.c:1499 netlink_broadcast net/netlink/af_netlink.c:1544 [inline] nlmsg_multicast include/net/netlink.h:968 [inline] nlmsg_notify+0xf6/0x1c0 net/netlink/af_netlink.c:2542 __dev_notify_flags+0x77/0x3c0 net/core/dev.c:7958 dev_change_flags+0xe3/0x190 net/core/dev.c:8000 do_setlink+0xbdd/0x3880 net/core/rtnetlink.c:2520 __rtnl_newlink net/core/rtnetlink.c:3163 [inline] rtnl_newlink+0x14ae/0x1e30 net/core/rtnetlink.c:3289 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+0x7ee/0x920 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4919 [inline] __free_pages+0x45/0x1e0 mm/page_alloc.c:4925 __free_slab+0x22b/0x2e0 mm/slub.c:1774 __slab_free+0x362/0x370 mm/slub.c:3012 qlist_free_all+0x4c/0xb0 mm/kasan/quarantine.c:167 quarantine_reduce+0x174/0x190 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x43/0x1e0 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+0xd0/0x210 mm/slub.c:2842 kmem_cache_alloc_node include/linux/slab.h:427 [inline] __alloc_skb+0x78/0x4d0 net/core/skbuff.c:198 alloc_skb include/linux/skbuff.h:1060 [inline] nlmsg_new include/net/netlink.h:888 [inline] netlink_ack+0x281/0x9c0 net/netlink/af_netlink.c:2433 netlink_rcv_skb+0x208/0x3a0 net/netlink/af_netlink.c:2505 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x856/0xa20 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x939/0xc00 net/netlink/af_netlink.c:1933 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] __sys_sendto+0x42a/0x5c0 net/socket.c:1942 __do_sys_sendto net/socket.c:1954 [inline] __se_sys_sendto net/socket.c:1950 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:1950 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290 Memory state around the buggy address: ffff8881dada7380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881dada7400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881dada7480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881dada7500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881dada7580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== syz-executor.2 (12690) used greatest stack depth: 23752 bytes left