================================================================== BUG: KASAN: use-after-free in __list_add_valid+0xa5/0xb0 lib/list_debug.c:30 Read of size 8 at addr ffff88802be435c8 by task syz-executor.1/2450 CPU: 0 PID: 2450 Comm: syz-executor.1 Not tainted 6.0.0-rc6-next-20220923-syzkaller #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+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbb/0x1f0 mm/kasan/report.c:495 __list_add_valid+0xa5/0xb0 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+0x37/0x120 mm/vmscan.c:695 sget_fc+0x5e7/0x7c0 fs/super.c:581 vfs_get_super fs/super.c:1163 [inline] get_tree_nodev+0x24/0x1d0 fs/super.c:1198 mqueue_get_tree+0xee/0x130 ipc/mqueue.c:435 vfs_get_tree+0x89/0x2f0 fs/super.c:1530 fc_mount+0x13/0xc0 fs/namespace.c:1043 mq_create_mount ipc/mqueue.c:485 [inline] mq_init_ns+0x43e/0x630 ipc/mqueue.c:1700 create_ipc_ns ipc/namespace.c:58 [inline] copy_ipcs+0x35e/0x600 ipc/namespace.c:97 create_new_namespaces+0x210/0xb20 kernel/nsproxy.c:90 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3193 __do_sys_unshare kernel/fork.c:3264 [inline] __se_sys_unshare kernel/fork.c:3262 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3262 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fb91fe8b5a9 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb9210b5168 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007fb91ffabf80 RCX: 00007fb91fe8b5a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006c060000 RBP: 00007fb91fee6580 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffec6f27d9f R14: 00007fb9210b5300 R15: 0000000000022000 Allocated by task 2448: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa1/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:934 [inline] __kmalloc+0x54/0xc0 mm/slab_common.c:947 kmalloc include/linux/slab.h:564 [inline] kzalloc include/linux/slab.h:695 [inline] ops_init+0xfb/0x470 net/core/net_namespace.c:125 setup_net+0x5d1/0xc50 net/core/net_namespace.c:326 copy_net_ns+0x318/0x760 net/core/net_namespace.c:472 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178 copy_process+0x306e/0x71b0 kernel/fork.c:2259 kernel_clone+0xe7/0x980 kernel/fork.c:2676 __do_sys_clone3+0x1cd/0x2e0 kernel/fork.c:2975 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 2448: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1669 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695 slab_free mm/slub.c:3599 [inline] __kmem_cache_free+0xab/0x3b0 mm/slub.c:3612 ops_init+0xcd/0x470 net/core/net_namespace.c:140 setup_net+0x5d1/0xc50 net/core/net_namespace.c:326 copy_net_ns+0x318/0x760 net/core/net_namespace.c:472 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178 copy_process+0x306e/0x71b0 kernel/fork.c:2259 kernel_clone+0xe7/0x980 kernel/fork.c:2676 __do_sys_clone3+0x1cd/0x2e0 kernel/fork.c:2975 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481 insert_work+0x48/0x350 kernel/workqueue.c:1358 __queue_work+0x693/0x13b0 kernel/workqueue.c:1517 queue_work_on+0xee/0x110 kernel/workqueue.c:1545 queue_work include/linux/workqueue.h:503 [inline] io_ring_ctx_wait_and_kill+0x356/0x38f io_uring/io_uring.c:2822 io_uring_release+0x42/0x46 io_uring/io_uring.c:2830 __fput+0x27c/0xa90 fs/file_table.c:320 task_work_run+0x16b/0x270 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xb35/0x2a20 kernel/exit.c:820 do_group_exit+0xd0/0x2a0 kernel/exit.c:950 get_signal+0x21a6/0x2430 kernel/signal.c:2858 arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:296 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88802be43000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1480 bytes inside of 2048-byte region [ffff88802be43000, ffff88802be43800) The buggy address belongs to the physical page: page:ffffea0000af9000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffffea0001edbe20 pfn:0x2be40 head:ffffea0000af9000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888011842000 dead000000080007 ffff88802be45000 raw: ffffea0001edbe20 ffffea000150b420 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 31902, tgid 31900 (syz-executor.0), ts 1539343368728, free_ts 1532404553713 prep_new_page mm/page_alloc.c:2538 [inline] get_page_from_freelist+0x1092/0x2d20 mm/page_alloc.c:4287 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5546 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2280 alloc_slab_page mm/slub.c:1739 [inline] allocate_slab+0x213/0x300 mm/slub.c:1884 new_slab mm/slub.c:1937 [inline] ___slab_alloc+0xac1/0x1430 mm/slub.c:3119 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3217 slab_alloc_node mm/slub.c:3302 [inline] __kmem_cache_alloc_node+0x18a/0x3d0 mm/slub.c:3375 kmalloc_trace+0x22/0x60 mm/slab_common.c:1014 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:695 [inline] copy_verifier_state+0x827/0xb80 kernel/bpf/verifier.c:1211 push_stack+0x1d2/0x560 kernel/bpf/verifier.c:1287 check_cond_jmp_op kernel/bpf/verifier.c:10223 [inline] do_check kernel/bpf/verifier.c:12450 [inline] do_check_common+0x6439/0xcc20 kernel/bpf/verifier.c:14642 do_check_main kernel/bpf/verifier.c:14705 [inline] bpf_check+0x73b1/0xacb0 kernel/bpf/verifier.c:15275 bpf_prog_load+0x13cb/0x2230 kernel/bpf/syscall.c:2605 __sys_bpf+0x1605/0x4cf0 kernel/bpf/syscall.c:4965 __do_sys_bpf kernel/bpf/syscall.c:5069 [inline] __se_sys_bpf kernel/bpf/syscall.c:5067 [inline] __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:5067 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1458 [inline] __free_pages_ok+0x846/0x1250 mm/page_alloc.c:1714 kvfree+0x42/0x50 mm/util.c:623 nfsd_reply_cache_shutdown+0x1a6/0x280 fs/nfsd/nfscache.c:222 nfsd_exit_net+0x110/0x4c0 fs/nfsd/nfsctl.c:1479 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:163 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:595 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Memory state around the buggy address: ffff88802be43480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802be43500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802be43580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802be43600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802be43680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================