================================================================== 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 ffff88805e2e981c by task syz-executor.1/16283 CPU: 0 PID: 16283 Comm: syz-executor.1 Not tainted 5.14.0-rc4-syzkaller #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+0x1ae/0x29f lib/dump_stack.c:105 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_setresuid+0x6d5/0x920 kernel/sys.c:702 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: 0033:0x4665e9 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:00007fcb2e6d9188 EFLAGS: 00000246 ORIG_RAX: 0000000000000075 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000000 RSI: 000000000000ee00 RDI: 000000000000ee01 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffe419a534f R14: 00007fcb2e6d9300 R15: 0000000000022000 Allocated by task 16282: 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:264 [inline] kmem_cache_alloc_trace+0x96/0x340 mm/slub.c:2983 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_setresuid+0x6d5/0x920 kernel/sys.c:702 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 16279: 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:230 [inline] slab_free_hook mm/slub.c:1625 [inline] slab_free_freelist_hook+0x1d8/0x290 mm/slub.c:1650 slab_free mm/slub.c:3210 [inline] kfree+0xd0/0x1f0 mm/slub.c:4264 put_cred_rcu+0x221/0x400 kernel/cred.c:124 rcu_do_batch kernel/rcu/tree.c:2550 [inline] rcu_core+0x906/0x14b0 kernel/rcu/tree.c:2785 __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+0x928/0xc60 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 device_del+0xa0b/0xc10 drivers/base/core.c:3552 device_unregister+0x17/0xb0 drivers/base/core.c:3575 wakeup_source_unregister+0x169/0x190 drivers/base/power/wakeup.c:248 ep_free+0x205/0x250 fs/eventpoll.c:779 ep_eventpoll_release+0x44/0x50 fs/eventpoll.c:788 __fput+0x352/0x7b0 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x201/0x220 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 do_syscall_64+0x4c/0xb0 arch/x86/entry/common.c:86 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+0x928/0xc60 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 disk_uevent+0x27d/0x400 block/genhd.c:372 register_disk block/genhd.c:439 [inline] __device_add_disk+0x7f1/0xbd0 block/genhd.c:527 add_disk include/linux/genhd.h:217 [inline] nbd_dev_add+0x625/0x860 drivers/block/nbd.c:1733 nbd_genl_connect+0x2a9/0x1c40 drivers/block/nbd.c:1842 genl_family_rcv_msg_doit net/netlink/genetlink.c:739 [inline] genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0xfb4/0x13c0 net/netlink/genetlink.c:800 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2504 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x7de/0x9b0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x9e7/0xe00 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg net/socket.c:723 [inline] ____sys_sendmsg+0x5a2/0x900 net/socket.c:2392 ___sys_sendmsg net/socket.c:2446 [inline] __sys_sendmsg+0x319/0x400 net/socket.c:2475 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 ffff88805e2e9800 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 28 bytes inside of 192-byte region [ffff88805e2e9800, ffff88805e2e98c0) The buggy address belongs to the page: page:ffffea000178ba40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5e2e9 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00005e2800 0000000b0000000b ffff888011041a00 raw: 0000000000000000 0000000080100010 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 8447, ts 60640631622, free_ts 0 prep_new_page mm/page_alloc.c:2436 [inline] get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4169 __alloc_pages+0x26c/0x5f0 mm/page_alloc.c:5391 alloc_slab_page mm/slub.c:1688 [inline] allocate_slab+0xf1/0x540 mm/slub.c:1828 new_slab mm/slub.c:1891 [inline] new_slab_objects mm/slub.c:2637 [inline] ___slab_alloc+0x1cf/0x350 mm/slub.c:2800 __slab_alloc mm/slub.c:2840 [inline] slab_alloc_node mm/slub.c:2922 [inline] slab_alloc mm/slub.c:2964 [inline] __kmalloc_track_caller+0x2e5/0x390 mm/slub.c:4619 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 ipv6_find_idev+0xa3/0x1b0 net/ipv6/addrconf.c:481 inet6_rtm_newaddr+0x62b/0x2a90 net/ipv6/addrconf.c:4852 rtnetlink_rcv_msg+0x91c/0xe50 net/core/rtnetlink.c:5574 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x7de/0x9b0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x9e7/0xe00 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg net/socket.c:723 [inline] __sys_sendto+0x541/0x720 net/socket.c:2019 __do_sys_sendto net/socket.c:2031 [inline] __se_sys_sendto net/socket.c:2027 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2027 page_owner free stack trace missing Memory state around the buggy address: ffff88805e2e9700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805e2e9780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88805e2e9800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805e2e9880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88805e2e9900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================