audit: type=1400 audit(1584551797.681:36): avc: denied { map } for pid=7252 comm="syz-executor815" path="/root/syz-executor815421090" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 IPVS: ftp: loaded support on port[0] = 21 ================================================================== BUG: KASAN: slab-out-of-bounds in tcindex_set_parms+0x1521/0x16a0 net/sched/cls_tcindex.c:473 Write of size 16 at addr ffff888095dda8f0 by task syz-executor815/7253 CPU: 0 PID: 7253 Comm: syz-executor815 Not tainted 4.14.173-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x13e/0x194 lib/dump_stack.c:58 print_address_description.cold+0x7c/0x1e2 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2ae mm/kasan/report.c:393 tcindex_set_parms+0x1521/0x16a0 net/sched/cls_tcindex.c:473 tcindex_change+0x1b5/0x270 net/sched/cls_tcindex.c:534 tc_ctl_tfilter+0xf13/0x18e6 net/sched/cls_api.c:738 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4315 netlink_rcv_skb+0x127/0x370 net/netlink/af_netlink.c:2433 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline] netlink_unicast+0x437/0x620 net/netlink/af_netlink.c:1313 netlink_sendmsg+0x733/0xbe0 net/netlink/af_netlink.c:1878 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xc5/0x100 net/socket.c:656 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x440e79 RSP: 002b:00007fffaef80ca8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004a2650 RCX: 0000000000440e79 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 00007fffaef80cb0 R08: 0000000120080522 R09: 0000000120080522 R10: 0000000120080522 R11: 0000000000000246 R12: 00000000004a2650 R13: 0000000000402410 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 7253: save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc_track_caller+0x153/0x7b0 mm/slab.c:3735 kmemdup+0x23/0x50 mm/util.c:118 kmemdup include/linux/string.h:420 [inline] mpls_dev_sysctl_register+0x94/0x290 net/mpls/af_mpls.c:1323 mpls_add_dev net/mpls/af_mpls.c:1389 [inline] mpls_dev_notify+0x1f9/0x691 net/mpls/af_mpls.c:1511 notifier_call_chain+0x107/0x1a0 kernel/notifier.c:93 call_netdevice_notifiers net/core/dev.c:1687 [inline] register_netdevice+0x9e2/0xc70 net/core/dev.c:7691 register_netdev+0x17/0x30 net/core/dev.c:7798 sit_init_net+0x2cf/0x8d0 net/ipv6/sit.c:1850 ops_init+0xa5/0x3c0 net/core/net_namespace.c:118 setup_net+0x22f/0x500 net/core/net_namespace.c:295 copy_net_ns+0x19b/0x440 net/core/net_namespace.c:419 create_new_namespaces+0x375/0x730 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xa5/0x1e0 kernel/nsproxy.c:206 SYSC_unshare kernel/fork.c:2391 [inline] SyS_unshare+0x2ea/0x740 kernel/fork.c:2341 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 17: save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcb/0x260 mm/slab.c:3815 __rcu_reclaim kernel/rcu/rcu.h:190 [inline] rcu_do_batch kernel/rcu/tree.c:2699 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2929 [inline] rcu_process_callbacks+0x8a3/0x1190 kernel/rcu/tree.c:2946 __do_softirq+0x254/0x9bf kernel/softirq.c:288 The buggy address belongs to the object at ffff888095dda840 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 48 bytes to the right of 128-byte region [ffff888095dda840, ffff888095dda8c0) The buggy address belongs to the page: page:ffffea0002577680 count:1 mapcount:0 mapping:ffff888095dda000 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff888095dda000 0000000000000000 0000000100000015 raw: ffffea0002936ae0 ffffea0002593920 ffff88812fe56640 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888095dda780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc ffff888095dda800: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 >ffff888095dda880: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888095dda900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc ffff888095dda980: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ==================================================================