================================================================== BUG: KASAN: use-after-free in __list_add_valid+0x66/0x100 lib/list_debug.c:30 Read of size 8 at addr ffff88807d0de5c8 by task syz-executor.1/4361 CPU: 1 PID: 4361 Comm: syz-executor.1 Not tainted 6.0.0-syzkaller-06475-g4c86114194e6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 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:317 print_report+0x108/0x220 mm/kasan/report.c:433 kasan_report+0xfb/0x130 mm/kasan/report.c:495 __list_add_valid+0x66/0x100 lib/list_debug.c:30 __list_add include/linux/list.h:69 [inline] list_add_tail include/linux/list.h:102 [inline] register_shrinker_prepared+0x44/0x100 mm/vmscan.c:684 sget_fc+0x5f6/0x660 fs/super.c:581 vfs_get_super fs/super.c:1163 [inline] get_tree_nodev+0x26/0x160 fs/super.c:1198 vfs_get_tree+0x88/0x270 fs/super.c:1530 fc_mount+0x17/0xa0 fs/namespace.c:1043 mq_create_mount ipc/mqueue.c:485 [inline] mq_init_ns+0x3cb/0x560 ipc/mqueue.c:1701 create_ipc_ns ipc/namespace.c:58 [inline] copy_ipcs+0x2fd/0x500 ipc/namespace.c:94 create_new_namespaces+0x256/0x8e0 kernel/nsproxy.c:90 unshare_nsproxy_namespaces+0x11e/0x180 kernel/nsproxy.c:226 ksys_unshare+0x57f/0xb30 kernel/fork.c:3181 __do_sys_unshare kernel/fork.c:3252 [inline] __se_sys_unshare kernel/fork.c:3250 [inline] __x64_sys_unshare+0x34/0x40 kernel/fork.c:3250 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+0x63/0xcd RIP: 0033:0x7f24a9e878d9 Code: ff ff c3 66 2e 0f 1f 84 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 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f24aaf1e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007f24a9f8c1a0 RCX: 00007f24a9e878d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006c060000 RBP: 00007f24a9ee1cb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd55d0e4df R14: 00007f24aaf1e300 R15: 0000000000022000 Allocated by task 4357: 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:437 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:516 kasan_kmalloc include/linux/kasan.h:234 [inline] __kmalloc+0x226/0x370 mm/slub.c:4429 kmalloc include/linux/slab.h:605 [inline] kzalloc include/linux/slab.h:733 [inline] ops_init+0x85/0x430 net/core/net_namespace.c:124 setup_net+0x4bb/0xc10 net/core/net_namespace.c:325 copy_net_ns+0x359/0x5b0 net/core/net_namespace.c:471 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:3181 __do_sys_unshare kernel/fork.c:3252 [inline] __se_sys_unshare kernel/fork.c:3250 [inline] __x64_sys_unshare+0x34/0x40 kernel/fork.c:3250 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+0x63/0xcd Freed by task 4357: 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+0xd8/0x120 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1759 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1785 slab_free mm/slub.c:3539 [inline] kfree+0xda/0x210 mm/slub.c:4567 ops_init+0x333/0x430 net/core/net_namespace.c:139 setup_net+0x4bb/0xc10 net/core/net_namespace.c:325 copy_net_ns+0x359/0x5b0 net/core/net_namespace.c:471 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:3181 __do_sys_unshare kernel/fork.c:3252 [inline] __se_sys_unshare kernel/fork.c:3250 [inline] __x64_sys_unshare+0x34/0x40 kernel/fork.c:3250 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+0x63/0xcd 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 call_rcu+0x163/0x9c0 kernel/rcu/tree.c:2796 netlink_release+0x12fc/0x1720 net/netlink/af_netlink.c:815 __sock_release net/socket.c:650 [inline] sock_release+0x7a/0x140 net/socket.c:678 ops_exit_list net/core/net_namespace.c:162 [inline] setup_net+0x8fd/0xc10 net/core/net_namespace.c:348 copy_net_ns+0x359/0x5b0 net/core/net_namespace.c:471 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:3181 __do_sys_unshare kernel/fork.c:3252 [inline] __se_sys_unshare kernel/fork.c:3250 [inline] __x64_sys_unshare+0x34/0x40 kernel/fork.c:3250 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+0x63/0xcd The buggy address belongs to the object at ffff88807d0de000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1480 bytes inside of 2048-byte region [ffff88807d0de000, ffff88807d0de800) The buggy address belongs to the physical page: page:ffffea0001f43600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7d0d8 head:ffffea0001f43600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00009eb600 dead000000000002 ffff888012042000 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 4199, tgid 4190 (syz-executor.3), ts 82337052674, free_ts 82202176434 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549 alloc_slab_page+0x70/0xf0 mm/slub.c:1829 allocate_slab+0x5e/0x520 mm/slub.c:1974 new_slab mm/slub.c:2034 [inline] ___slab_alloc+0x42e/0xce0 mm/slub.c:3036 __slab_alloc mm/slub.c:3123 [inline] slab_alloc_node mm/slub.c:3214 [inline] slab_alloc mm/slub.c:3256 [inline] __kmalloc+0x2bd/0x370 mm/slub.c:4425 kmalloc include/linux/slab.h:605 [inline] sk_prot_alloc+0xde/0x200 net/core/sock.c:2030 sk_alloc+0x36/0x340 net/core/sock.c:2083 __netlink_create+0x6b/0x2b0 net/netlink/af_netlink.c:647 __netlink_kernel_create+0x1cf/0x7b0 net/netlink/af_netlink.c:2045 netlink_kernel_create include/linux/netlink.h:62 [inline] xfrm_user_net_init+0x9e/0x150 net/xfrm/xfrm_user.c:3730 ops_init+0x313/0x430 net/core/net_namespace.c:134 setup_net+0x4bb/0xc10 net/core/net_namespace.c:325 copy_net_ns+0x359/0x5b0 net/core/net_namespace.c:471 create_new_namespaces+0x4db/0x8e0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x11e/0x180 kernel/nsproxy.c:226 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x7d/0x630 mm/page_alloc.c:3476 free_slab mm/slub.c:2073 [inline] discard_slab mm/slub.c:2079 [inline] __unfreeze_partials+0x1ab/0x200 mm/slub.c:2553 put_cpu_partial+0x116/0x180 mm/slub.c:2629 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:447 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:727 [inline] slab_alloc_node mm/slub.c:3248 [inline] __kmalloc_node_track_caller+0x1f1/0x400 mm/slub.c:4964 kmalloc_reserve net/core/skbuff.c:437 [inline] __alloc_skb+0x11d/0x620 net/core/skbuff.c:509 alloc_skb include/linux/skbuff.h:1265 [inline] alloc_uevent_skb+0x73/0x220 lib/kobject_uevent.c:290 uevent_net_broadcast_tagged lib/kobject_uevent.c:351 [inline] kobject_uevent_net_broadcast+0x177/0x570 lib/kobject_uevent.c:412 kobject_uevent_env+0x6b1/0x8e0 lib/kobject_uevent.c:593 rx_queue_add_kobject net/core/net-sysfs.c:1074 [inline] net_rx_queue_update_kobjects+0x24f/0x4c0 net/core/net-sysfs.c:1114 register_queue_kobjects net/core/net-sysfs.c:1774 [inline] netdev_register_kobject+0x222/0x310 net/core/net-sysfs.c:2019 register_netdevice+0x136c/0x1a20 net/core/dev.c:10053 __ip_tunnel_create+0x2af/0x370 net/ipv4/ip_tunnel.c:267 Memory state around the buggy address: ffff88807d0de480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807d0de500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807d0de580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807d0de600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807d0de680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================