================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_add_negative include/asm-generic/atomic-instrumented.h:556 [inline] BUG: KASAN: use-after-free in get_ucounts+0x28/0x160 kernel/ucount.c:152 Write of size 4 at addr ffff888093d6ef1c by task syz-executor.1/17237 CPU: 0 PID: 17237 Comm: syz-executor.1 Tainted: G W 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack_lvl+0x1ae/0x29f lib/dump_stack.c:96 print_address_description+0x66/0x3b0 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report+0x163/0x210 mm/kasan/report.c:436 check_region_inline mm/kasan/generic.c:135 [inline] kasan_check_range+0x2b5/0x2f0 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_add_negative include/asm-generic/atomic-instrumented.h:556 [inline] get_ucounts+0x28/0x160 kernel/ucount.c:152 set_cred_ucounts+0x220/0x2d0 kernel/cred.c:684 __sys_setreuid+0x634/0x8a0 kernel/sys.c:561 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 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:00007f980a03b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000071 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 000000000000ee01 RDI: 000000000000ee01 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fff84c2199f R14: 00007f980a03b300 R15: 0000000000022000 Allocated by task 17222: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xc4/0xf0 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:263 [inline] kmem_cache_alloc_trace+0x96/0x340 mm/slub.c:2997 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] alloc_ucounts+0x176/0x420 kernel/ucount.c:169 set_cred_ucounts+0x220/0x2d0 kernel/cred.c:684 __sys_setreuid+0x634/0x8a0 kernel/sys.c:561 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 4858: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x3d/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0x109/0x150 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:229 [inline] slab_free_hook mm/slub.c:1639 [inline] slab_free_freelist_hook+0x1d8/0x290 mm/slub.c:1664 slab_free mm/slub.c:3224 [inline] kfree+0xcf/0x2d0 mm/slub.c:4268 put_cred_rcu+0x221/0x400 kernel/cred.c:124 rcu_do_batch kernel/rcu/tree.c:2558 [inline] rcu_core+0x906/0x14b0 kernel/rcu/tree.c:2793 __do_softirq+0x372/0x783 kernel/softirq.c:558 Last potentially related work creation: kasan_save_stack+0x27/0x50 mm/kasan/common.c:38 kasan_record_aux_stack+0xee/0x120 mm/kasan/generic.c:348 insert_work+0x54/0x400 kernel/workqueue.c:1332 __queue_work+0x90e/0xc40 kernel/workqueue.c:1498 queue_work_on+0x111/0x200 kernel/workqueue.c:1525 queue_work include/linux/workqueue.h:507 [inline] call_usermodehelper_exec+0x283/0x470 kernel/umh.c:435 kobject_uevent_env+0x1337/0x1700 lib/kobject_uevent.c:618 __kobject_del+0x286/0x310 lib/kobject.c:617 kobject_cleanup+0x174/0x280 lib/kobject.c:696 netdev_queue_update_kobjects+0x38d/0x400 net/core/net-sysfs.c:1670 remove_queue_kobjects net/core/net-sysfs.c:1767 [inline] netdev_unregister_kobject+0x100/0x1b0 net/core/net-sysfs.c:1917 unregister_netdevice_many+0x145b/0x1980 net/core/dev.c:11086 unregister_netdevice_queue+0x2e6/0x350 net/core/dev.c:10993 unregister_netdevice include/linux/netdevice.h:2969 [inline] ip_tunnel_ctl+0x148/0x1860 net/ipv4/ip_tunnel.c:942 ipgre_tunnel_ctl+0x27a/0x780 net/ipv4/ip_gre.c:793 ip_tunnel_ioctl+0x12e/0x1e0 net/ipv4/ip_tunnel.c:962 dev_do_ioctl net/core/dev_ioctl.c:230 [inline] dev_ifsioc+0x7ea/0xbc0 net/core/dev_ioctl.c:336 dev_ioctl+0x5c9/0xb90 net/core/dev_ioctl.c:530 sock_ioctl+0x5e7/0x6a0 net/socket.c:1139 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:1069 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:1055 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Second to last potentially related work creation: kasan_save_stack+0x27/0x50 mm/kasan/common.c:38 kasan_record_aux_stack+0xee/0x120 mm/kasan/generic.c:348 insert_work+0x54/0x400 kernel/workqueue.c:1332 __queue_work+0x90e/0xc40 kernel/workqueue.c:1498 queue_work_on+0x111/0x200 kernel/workqueue.c:1525 queue_work include/linux/workqueue.h:507 [inline] call_usermodehelper_exec+0x283/0x470 kernel/umh.c:435 kobject_uevent_env+0x1337/0x1700 lib/kobject_uevent.c:618 kobject_synth_uevent+0x3bf/0x900 lib/kobject_uevent.c:208 uevent_store+0x20/0x60 drivers/base/core.c:2370 kernfs_fop_write_iter+0x3b6/0x510 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2114 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0xa39/0xc90 fs/read_write.c:605 ksys_write+0x171/0x2a0 fs/read_write.c:658 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff888093d6ef00 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 28 bytes inside of 192-byte region [ffff888093d6ef00, ffff888093d6efc0) The buggy address belongs to the page: page:ffffea00024f5b80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x93d6e flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea000520cb40 0000000400000004 ffff888011841a00 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 26276, ts 340330859813, free_ts 337170100635 prep_new_page mm/page_alloc.c:2445 [inline] get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4178 __alloc_pages+0x26c/0x5f0 mm/page_alloc.c:5386 alloc_slab_page mm/slub.c:1702 [inline] allocate_slab+0xf1/0x540 mm/slub.c:1842 new_slab mm/slub.c:1905 [inline] new_slab_objects mm/slub.c:2651 [inline] ___slab_alloc+0x1cf/0x350 mm/slub.c:2814 __slab_alloc mm/slub.c:2854 [inline] slab_alloc_node mm/slub.c:2936 [inline] slab_alloc mm/slub.c:2978 [inline] __kmalloc_track_caller+0x2e5/0x390 mm/slub.c:4623 kmemdup+0x21/0x50 mm/util.c:128 neigh_parms_alloc+0x7a/0x4c0 net/core/neighbour.c:1622 ipv6_add_dev+0x2bf/0x10d0 net/ipv6/addrconf.c:390 addrconf_notify+0x652/0x2030 net/ipv6/addrconf.c:3491 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:410 call_netdevice_notifiers_info net/core/dev.c:2122 [inline] call_netdevice_notifiers_extack net/core/dev.c:2134 [inline] call_netdevice_notifiers net/core/dev.c:2148 [inline] register_netdevice+0x160e/0x1c20 net/core/dev.c:10346 register_netdev+0x37/0x50 net/core/dev.c:10439 vti6_init_net+0x208/0x2c0 net/ipv6/ip6_vti.c:1161 ops_init+0x327/0x410 net/core/net_namespace.c:140 setup_net+0x35b/0x9d0 net/core/net_namespace.c:333 copy_net_ns+0x392/0x5e0 net/core/net_namespace.c:474 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1355 [inline] free_pcp_prepare+0xc29/0xd20 mm/page_alloc.c:1406 free_unref_page_prepare mm/page_alloc.c:3341 [inline] free_unref_page+0x7e/0x550 mm/page_alloc.c:3420 destroy_compound_page include/linux/mm.h:933 [inline] __put_compound_page mm/swap.c:111 [inline] release_pages+0x5f3/0x1af0 mm/swap.c:948 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:242 [inline] tlb_flush_mmu+0x780/0x910 mm/mmu_gather.c:249 zap_pte_range+0x19a7/0x1b40 mm/memory.c:1335 zap_pmd_range mm/memory.c:1384 [inline] zap_pud_range mm/memory.c:1413 [inline] zap_p4d_range mm/memory.c:1434 [inline] unmap_page_range+0x745/0xa20 mm/memory.c:1455 unmap_vmas+0x1d1/0x360 mm/memory.c:1532 exit_mmap+0x3ed/0x7a0 mm/mmap.c:3202 __mmput+0x111/0x370 kernel/fork.c:1101 exit_mm+0x60a/0x770 kernel/exit.c:501 do_exit+0x6ae/0x2510 kernel/exit.c:812 do_group_exit+0x168/0x2d0 kernel/exit.c:922 get_signal+0x16c0/0x20d0 kernel/signal.c:2796 arch_do_signal_or_restart+0x8e/0x6d0 arch/x86/kernel/signal.c:789 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x191/0x220 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:302 Memory state around the buggy address: ffff888093d6ee00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888093d6ee80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888093d6ef00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888093d6ef80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888093d6f000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================