audit: type=1400 audit(1514741691.830:10): avc: denied { net_raw } for pid=3144 comm="syzkaller271204" capability=13 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 audit: type=1400 audit(1514741691.830:11): avc: denied { net_admin } for pid=3144 comm="syzkaller271204" capability=12 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 ================================================================== BUG: KASAN: slab-out-of-bounds in __tcp_hdrlen include/linux/tcp.h:35 [inline] BUG: KASAN: slab-out-of-bounds in tcp_hdrlen include/linux/tcp.h:40 [inline] BUG: KASAN: slab-out-of-bounds in qdisc_pkt_len_init net/core/dev.c:3160 [inline] BUG: KASAN: slab-out-of-bounds in __dev_queue_xmit+0x20d3/0x2200 net/core/dev.c:3465 Read of size 2 at addr ffff8801c97bf660 by task syzkaller271204/3144 CPU: 1 PID: 3144 Comm: syzkaller271204 Not tainted 4.15.0-rc4-mm1+ #49 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+0x194/0x257 lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:355 [inline] kasan_report+0x23b/0x360 mm/kasan/report.c:413 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:432 __tcp_hdrlen include/linux/tcp.h:35 [inline] tcp_hdrlen include/linux/tcp.h:40 [inline] qdisc_pkt_len_init net/core/dev.c:3160 [inline] __dev_queue_xmit+0x20d3/0x2200 net/core/dev.c:3465 dev_queue_xmit+0x17/0x20 net/core/dev.c:3554 packet_snd net/packet/af_packet.c:2943 [inline] packet_sendmsg+0x3ad5/0x60a0 net/packet/af_packet.c:2968 sock_sendmsg_nosec net/socket.c:628 [inline] sock_sendmsg+0xca/0x110 net/socket.c:638 sock_write_iter+0x31a/0x5d0 net/socket.c:907 call_write_iter include/linux/fs.h:1776 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x684/0x970 fs/read_write.c:482 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x444df9 RSP: 002b:00000000007eff78 EFLAGS: 00000297 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ffce7844fe0 RCX: 0000000000444df9 RDX: 00000000000000ce RSI: 0000000020fecf2b RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000120080522 R09: 0000000120080522 R10: 0000000120080522 R11: 0000000000000297 R12: 00000000004029f0 R13: 0000000000402a80 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 3144: 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_node mm/slab.c:3669 [inline] __kmalloc_node_track_caller+0x47/0x70 mm/slab.c:3683 __kmalloc_reserve.isra.41+0x41/0xd0 net/core/skbuff.c:137 __alloc_skb+0x13b/0x780 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:983 [inline] alloc_skb_with_frags+0x10d/0x750 net/core/skbuff.c:5146 sock_alloc_send_pskb+0x787/0x9b0 net/core/sock.c:2088 packet_alloc_skb net/packet/af_packet.c:2802 [inline] packet_snd net/packet/af_packet.c:2893 [inline] packet_sendmsg+0x1ec2/0x60a0 net/packet/af_packet.c:2968 sock_sendmsg_nosec net/socket.c:628 [inline] sock_sendmsg+0xca/0x110 net/socket.c:638 sock_write_iter+0x31a/0x5d0 net/socket.c:907 call_write_iter include/linux/fs.h:1776 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x684/0x970 fs/read_write.c:482 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 entry_SYSCALL_64_fastpath+0x1f/0x96 Freed by task 1675: 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:3485 [inline] kfree+0xd6/0x260 mm/slab.c:3800 free_request_size+0x59/0x70 block/blk-core.c:751 mempool_free+0xd4/0x1d0 mm/mempool.c:439 blk_free_request block/blk-core.c:1098 [inline] __blk_put_request+0x4df/0xb50 block/blk-core.c:1664 blk_finish_request+0x33f/0x680 block/blk-core.c:3068 scsi_end_request+0x3c7/0x810 drivers/scsi/scsi_lib.c:702 scsi_io_completion+0x8ab/0x16b0 drivers/scsi/scsi_lib.c:865 scsi_finish_command+0x5f6/0x890 drivers/scsi/scsi.c:248 scsi_softirq_done+0x3ab/0x480 drivers/scsi/scsi_lib.c:1649 blk_done_softirq+0x48a/0x700 block/blk-softirq.c:37 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285 The buggy address belongs to the object at ffff8801c97bf200 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 96 bytes to the right of 1024-byte region [ffff8801c97bf200, ffff8801c97bf600) The buggy address belongs to the page: page:ffffea000725ef80 count:1 mapcount:0 mapping:ffff8801c97be000 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801c97be000 0000000000000000 0000000100000007 raw: ffffea000725e3a0 ffffea00072411a0 ffff8801dac00ac0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c97bf500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801c97bf580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801c97bf600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801c97bf680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c97bf700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================