netlink: 'syz-executor.5': attribute type 2 has an invalid length. audit: type=1804 audit(1555115042.345:54): pid=8423 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir807473822/syzkaller.icMoNm/10/bus" dev="sda1" ino=16528 res=1 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 8421 Comm: syz-executor.5 Not tainted 4.19.34 #2 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 kobject: 'loop4' (000000004df4f78d): kobject_uevent_env RIP: 0010:dccp_timeout_obj_to_nlattr+0x96/0x170 net/netfilter/nf_conntrack_proto_dccp.c:712 Code: f3 65 48 8b 14 25 28 00 00 00 48 89 55 d0 31 d2 48 89 85 70 ff ff ff e8 38 ff d3 fb 48 8b 8d 70 ff ff ff 48 89 d8 48 c1 e8 03 <0f> b6 14 08 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 a3 RSP: 0018:ffff88805ca973c8 EFLAGS: 00010247 RAX: 0000000000000000 RBX: 0000000000000004 RCX: dffffc0000000000 RDX: 0000000000020aa2 RSI: ffffffff85973808 RDI: 1ffff1100b952e7b kobject: 'loop4' (000000004df4f78d): fill_kobj_path: path = '/devices/virtual/block/loop4' RBP: ffff88805ca97460 R08: ffff88805ca8e100 R09: ffff88808b6a88e8 R10: ffffed10116d511c R11: ffff88808b6a88e0 R12: ffffffff87e12aa0 R13: 0000000000000001 R14: ffff88808fb2bc80 R15: ffff88805ca97438 FS: 00007f383f4bd700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc579b1cbc CR3: 000000008c9c5000 CR4: 00000000001406e0 Call Trace: kobject: 'loop0' (00000000a9c6ec72): kobject_uevent_env cttimeout_default_fill_info net/netfilter/nfnetlink_cttimeout.c:424 [inline] cttimeout_default_get+0x69a/0xa80 net/netfilter/nfnetlink_cttimeout.c:471 kobject: 'loop0' (00000000a9c6ec72): fill_kobj_path: path = '/devices/virtual/block/loop0' nfnetlink_rcv_msg+0xd12/0xfe0 net/netfilter/nfnetlink.c:228 audit: type=1400 audit(1555115042.355:55): avc: denied { write } for pid=8420 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1 netlink_rcv_skb+0x180/0x460 net/netlink/af_netlink.c:2454 audit: type=1400 audit(1555115042.535:56): avc: denied { map_create } for pid=8440 comm="syz-executor.0" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1 kobject: 'loop1' (00000000ecf8fe10): kobject_uevent_env kobject: 'loop1' (00000000ecf8fe10): fill_kobj_path: path = '/devices/virtual/block/loop1' nfnetlink_rcv+0x1c0/0x460 net/netfilter/nfnetlink.c:560 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x53c/0x720 net/netlink/af_netlink.c:1343 kobject: 'loop0' (00000000a9c6ec72): kobject_uevent_env netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908 kobject: 'loop0' (00000000a9c6ec72): fill_kobj_path: path = '/devices/virtual/block/loop0' sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:632 ___sys_sendmsg+0x806/0x930 net/socket.c:2115 kobject: 'loop0' (00000000a9c6ec72): kobject_uevent_env __sys_sendmsg+0x105/0x1d0 net/socket.c:2153 kobject: 'loop0' (00000000a9c6ec72): fill_kobj_path: path = '/devices/virtual/block/loop0' __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2160 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458c29 Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f383f4bcc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458c29 RDX: 0000000000000000 RSI: 0000000020dddfc8 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f383f4bd6d4 R13: 00000000004c638d R14: 00000000004daae0 R15: 00000000ffffffff Modules linked in: kobject: 'loop3' (00000000466b621c): kobject_uevent_env kobject: 'loop3' (00000000466b621c): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (0000000085349701): kobject_uevent_env kobject: 'loop2' (0000000085349701): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (00000000a9c6ec72): kobject_uevent_env kobject: 'loop0' (00000000a9c6ec72): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000ecf8fe10): kobject_uevent_env ---[ end trace 278ceccc8b5a1fe0 ]--- kobject: 'loop1' (00000000ecf8fe10): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (00000000466b621c): kobject_uevent_env kobject: 'loop3' (00000000466b621c): fill_kobj_path: path = '/devices/virtual/block/loop3' RIP: 0010:dccp_timeout_obj_to_nlattr+0x96/0x170 net/netfilter/nf_conntrack_proto_dccp.c:712 Code: f3 65 48 8b 14 25 28 00 00 00 48 89 55 d0 31 d2 48 89 85 70 ff ff ff e8 38 ff d3 fb 48 8b 8d 70 ff ff ff 48 89 d8 48 c1 e8 03 <0f> b6 14 08 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 a3 RSP: 0018:ffff88805ca973c8 EFLAGS: 00010247 RAX: 0000000000000000 RBX: 0000000000000004 RCX: dffffc0000000000 RDX: 0000000000020aa2 RSI: ffffffff85973808 RDI: 1ffff1100b952e7b RBP: ffff88805ca97460 R08: ffff88805ca8e100 R09: ffff88808b6a88e8 R10: ffffed10116d511c R11: ffff88808b6a88e0 R12: ffffffff87e12aa0 R13: 0000000000000001 R14: ffff88808fb2bc80 R15: ffff88805ca97438 FS: 00007f383f4bd700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020c0007f CR3: 000000008c9c5000 CR4: 00000000001406e0