device syz1 left promiscuous mode device syz1 entered promiscuous mode ================================================================== BUG: KASAN: slab-out-of-bounds in __ptr_ring_produce include/linux/ptr_ring.h:107 [inline] BUG: KASAN: slab-out-of-bounds in ptr_ring_produce include/linux/ptr_ring.h:126 [inline] BUG: KASAN: slab-out-of-bounds in skb_array_produce include/linux/skb_array.h:48 [inline] BUG: KASAN: slab-out-of-bounds in tun_net_xmit+0x120a/0x1280 drivers/net/tun.c:917 Read of size 8 at addr ffff8801ce865360 by task kworker/1:2/1271 CPU: 1 PID: 1271 Comm: kworker/1:2 Not tainted 4.13.0-mm1+ #7 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x24e/0x340 mm/kasan/report.c:409 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430 __ptr_ring_produce include/linux/ptr_ring.h:107 [inline] ptr_ring_produce include/linux/ptr_ring.h:126 [inline] skb_array_produce include/linux/skb_array.h:48 [inline] tun_net_xmit+0x120a/0x1280 drivers/net/tun.c:917 __netdev_start_xmit include/linux/netdevice.h:4000 [inline] netdev_start_xmit include/linux/netdevice.h:4009 [inline] xmit_one net/core/dev.c:2975 [inline] dev_hard_start_xmit+0x248/0xac0 net/core/dev.c:2991 sch_direct_xmit+0x31d/0x6d0 net/sched/sch_generic.c:186 __dev_xmit_skb net/core/dev.c:3173 [inline] __dev_queue_xmit+0x15fe/0x1e40 net/core/dev.c:3440 dev_queue_xmit+0x17/0x20 net/core/dev.c:3505 neigh_resolve_output+0x5d0/0x9f0 net/core/neighbour.c:1350 neigh_output include/net/neighbour.h:481 [inline] ip6_finish_output2+0xad1/0x22a0 net/ipv6/ip6_output.c:120 ip6_finish_output+0x2f9/0x920 net/ipv6/ip6_output.c:146 NF_HOOK_COND include/linux/netfilter.h:238 [inline] ip6_output+0x1f4/0x850 net/ipv6/ip6_output.c:163 dst_output include/net/dst.h:472 [inline] NF_HOOK.constprop.35+0xff/0x630 include/linux/netfilter.h:249 mld_sendpack+0x6a8/0xcc0 net/ipv6/mcast.c:1660 mld_send_initial_cr.part.24+0x103/0x150 net/ipv6/mcast.c:2072 mld_send_initial_cr net/ipv6/mcast.c:2056 [inline] ipv6_mc_dad_complete+0x99/0x130 net/ipv6/mcast.c:2079 addrconf_dad_completed+0x7fe/0x970 net/ipv6/addrconf.c:4025 addrconf_dad_begin net/ipv6/addrconf.c:3821 [inline] addrconf_dad_work+0x340/0xfc0 net/ipv6/addrconf.c:3921 process_one_work+0xbfa/0x1bd0 kernel/workqueue.c:2119 worker_thread+0x223/0x1860 kernel/workqueue.c:2253 kthread+0x39c/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 Allocated by task 6018: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551 __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x162/0x760 mm/slab.c:3734 kmalloc_array include/linux/slab.h:612 [inline] kcalloc include/linux/slab.h:623 [inline] __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:441 [inline] ptr_ring_resize_multiple include/linux/ptr_ring.h:599 [inline] skb_array_resize_multiple include/linux/skb_array.h:200 [inline] tun_queue_resize drivers/net/tun.c:2763 [inline] tun_device_event+0x3d3/0xcd0 drivers/net/tun.c:2781 notifier_call_chain+0x136/0x2c0 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x51/0x90 net/core/dev.c:1671 call_netdevice_notifiers+0x6a/0x90 net/core/dev.c:1687 do_setlink+0xbeb/0x38d0 net/core/rtnetlink.c:2089 rtnl_setlink+0x270/0x3c0 net/core/rtnetlink.c:2300 rtnetlink_rcv_msg+0x733/0x1090 net/core/rtnetlink.c:4246 netlink_rcv_skb+0x216/0x440 net/netlink/af_netlink.c:2405 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4258 netlink_unicast_kernel net/netlink/af_netlink.c:1273 [inline] netlink_unicast+0x4e8/0x6f0 net/netlink/af_netlink.c:1299 netlink_sendmsg+0xa4a/0xe70 net/netlink/af_netlink.c:1862 sock_sendmsg_nosec net/socket.c:633 [inline] sock_sendmsg+0xca/0x110 net/socket.c:643 sock_write_iter+0x320/0x5e0 net/socket.c:912 call_write_iter include/linux/fs.h:1770 [inline] do_iter_readv_writev+0x531/0x7f0 fs/read_write.c:673 do_iter_write+0x15a/0x540 fs/read_write.c:952 vfs_writev+0x18a/0x340 fs/read_write.c:997 do_writev+0xfc/0x2a0 fs/read_write.c:1032 SYSC_writev fs/read_write.c:1105 [inline] SyS_writev+0x27/0x30 fs/read_write.c:1102 entry_SYSCALL_64_fastpath+0x1f/0xbe Freed by task 4429: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3503 [inline] kfree+0xca/0x250 mm/slab.c:3820 selinux_cred_free+0x48/0x70 security/selinux/hooks.c:3807 security_cred_free+0x48/0x80 security/security.c:994 put_cred_rcu+0x106/0x400 kernel/cred.c:117 __rcu_reclaim kernel/rcu/rcu.h:195 [inline] rcu_do_batch kernel/rcu/tree.c:2681 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2935 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2902 [inline] rcu_process_callbacks+0xd3e/0x17b0 kernel/rcu/tree.c:2919 __do_softirq+0x2bb/0xbd0 kernel/softirq.c:284 The buggy address belongs to the object at ffff8801ce865340 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes to the right of 32-byte region [ffff8801ce865340, ffff8801ce865360) The buggy address belongs to the page: page:ffffea00073a1940 count:1 mapcount:0 mapping:ffff8801ce865000 index:0xffff8801ce865fc1 flags: 0x200000000000100(slab) raw: 0200000000000100 ffff8801ce865000 ffff8801ce865fc1 000000010000003f raw: ffffea00073ca460 ffffea00073d1e60 ffff8801dac001c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801ce865200: 00 00 00 00 fc fc fc fc fb fb fb fb fc fc fc fc ffff8801ce865280: 00 00 00 00 fc fc fc fc fb fb fb fb fc fc fc fc >ffff8801ce865300: fb fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc ^ ffff8801ce865380: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8801ce865400: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================