================================================================== BUG: KASAN: use-after-free in notifier_call_chain kernel/notifier.c:75 [inline] BUG: KASAN: use-after-free in raw_notifier_call_chain+0x3e/0x170 kernel/notifier.c:455 Read of size 8 at addr ffff888077813968 by task syz-executor.3/3642 CPU: 1 PID: 3642 Comm: syz-executor.3 Not tainted 5.19.0-rc3-syzkaller-00027-g78ca55889a54 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:313 print_report+0xf4/0x210 mm/kasan/report.c:429 kasan_report+0xfb/0x130 mm/kasan/report.c:491 notifier_call_chain kernel/notifier.c:75 [inline] raw_notifier_call_chain+0x3e/0x170 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:1940 [inline] call_netdevice_notifiers_extack net/core/dev.c:1981 [inline] call_netdevice_notifiers net/core/dev.c:1995 [inline] netdev_wait_allrefs_any net/core/dev.c:10225 [inline] netdev_run_todo+0x8ae/0x1070 net/core/dev.c:10337 tun_detach drivers/net/tun.c:695 [inline] tun_chr_close+0x11f/0x130 drivers/net/tun.c:3444 __fput+0x3b9/0x820 fs/file_table.c:317 task_work_run+0x146/0x1c0 kernel/task_work.c:177 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x547/0x1ed0 kernel/exit.c:795 do_group_exit+0x23b/0x2f0 kernel/exit.c:925 __do_sys_exit_group kernel/exit.c:936 [inline] __se_sys_exit_group kernel/exit.c:934 [inline] __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:934 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f555a689109 Code: Unable to access opcode bytes at RIP 0x7f555a6890df. RSP: 002b:00007fffe97123c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fffe9712570 RCX: 00007f555a689109 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000043 RBP: 0000000000000000 R08: 0000000000000025 R09: 00007fffe9712570 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f555a6e302e R13: 000000000000001c R14: 0000000000000013 R15: 00007fffe97125b0 Allocated by task 3642: 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:436 [inline] __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:750 [inline] slab_alloc_node mm/slub.c:3243 [inline] slab_alloc mm/slub.c:3251 [inline] __kmem_cache_alloc_lru mm/slub.c:3258 [inline] kmem_cache_alloc+0x199/0x2f0 mm/slub.c:3268 kmem_cache_zalloc include/linux/slab.h:723 [inline] net_alloc net/core/net_namespace.c:403 [inline] copy_net_ns+0x13c/0x5b0 net/core/net_namespace.c:458 create_new_namespaces+0x4db/0x8e0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x11e/0x180 kernel/nsproxy.c:226 ksys_unshare+0x57f/0xb30 kernel/fork.c:3165 __do_sys_unshare kernel/fork.c:3236 [inline] __se_sys_unshare kernel/fork.c:3234 [inline] __x64_sys_unshare+0x34/0x40 kernel/fork.c:3234 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Freed by task 4217: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0xd8/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1754 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1780 slab_free mm/slub.c:3536 [inline] kmem_cache_free+0xc7/0x270 mm/slub.c:3553 net_free net/core/net_namespace.c:432 [inline] cleanup_net+0xb8b/0xc50 net/core/net_namespace.c:615 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 insert_work+0x54/0x3e0 kernel/workqueue.c:1358 __queue_work+0x969/0xc20 kernel/workqueue.c:1517 call_timer_fn+0xf5/0x210 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1514 [inline] __run_timers+0x7a2/0x980 kernel/time/timer.c:1790 __do_softirq+0x382/0x793 kernel/softirq.c:571 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 insert_work+0x54/0x3e0 kernel/workqueue.c:1358 __queue_work+0x969/0xc20 kernel/workqueue.c:1517 call_timer_fn+0xf5/0x210 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1514 [inline] __run_timers+0x7a2/0x980 kernel/time/timer.c:1790 __do_softirq+0x382/0x793 kernel/softirq.c:571 The buggy address belongs to the object at ffff888077813700 which belongs to the cache net_namespace of size 6784 The buggy address is located 616 bytes inside of 6784-byte region [ffff888077813700, ffff888077815180) The buggy address belongs to the physical page: page:ffffea0001de0400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888077815280 pfn:0x77810 head:ffffea0001de0400 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff888077c0ba01 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888140007500 raw: ffff888077815280 0000000080040003 00000001ffffffff ffff888077c0ba01 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 3638, tgid 3638 (syz-executor.1), ts 119465247801, free_ts 107447307156 prep_new_page mm/page_alloc.c:2456 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4198 __alloc_pages+0x259/0x560 mm/page_alloc.c:5426 alloc_slab_page+0x70/0xf0 mm/slub.c:1824 allocate_slab+0x5e/0x520 mm/slub.c:1969 new_slab mm/slub.c:2029 [inline] ___slab_alloc+0x42e/0xce0 mm/slub.c:3031 __slab_alloc mm/slub.c:3118 [inline] slab_alloc_node mm/slub.c:3209 [inline] slab_alloc mm/slub.c:3251 [inline] __kmem_cache_alloc_lru mm/slub.c:3258 [inline] kmem_cache_alloc+0x246/0x2f0 mm/slub.c:3268 kmem_cache_zalloc include/linux/slab.h:723 [inline] net_alloc net/core/net_namespace.c:403 [inline] copy_net_ns+0x13c/0x5b0 net/core/net_namespace.c:458 create_new_namespaces+0x4db/0x8e0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x11e/0x180 kernel/nsproxy.c:226 ksys_unshare+0x57f/0xb30 kernel/fork.c:3165 __do_sys_unshare kernel/fork.c:3236 [inline] __se_sys_unshare kernel/fork.c:3234 [inline] __x64_sys_unshare+0x34/0x40 kernel/fork.c:3234 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1371 [inline] free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1421 free_unref_page_prepare mm/page_alloc.c:3343 [inline] free_unref_page+0x7d/0x390 mm/page_alloc.c:3438 __skb_frag_unref include/linux/skbuff.h:3487 [inline] skb_release_data+0x395/0x730 net/core/skbuff.c:672 skb_release_all net/core/skbuff.c:742 [inline] __kfree_skb+0x56/0x1d0 net/core/skbuff.c:756 tcp_eat_recv_skb net/ipv4/tcp.c:1598 [inline] tcp_recvmsg_locked+0x12da/0x23a0 net/ipv4/tcp.c:2508 tcp_recvmsg+0x22b/0x8b0 net/ipv4/tcp.c:2554 inet_recvmsg+0x13a/0x250 net/ipv4/af_inet.c:850 sock_recvmsg_nosec net/socket.c:995 [inline] sock_recvmsg net/socket.c:1013 [inline] sock_read_iter+0x3ab/0x4d0 net/socket.c:1086 call_read_iter include/linux/fs.h:2052 [inline] new_sync_read fs/read_write.c:401 [inline] vfs_read+0xa01/0xd10 fs/read_write.c:482 ksys_read+0x19b/0x2c0 fs/read_write.c:620 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Memory state around the buggy address: ffff888077813800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888077813880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888077813900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888077813980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888077813a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================