audit: type=1400 audit(1514506931.073:7): avc:  denied  { map } for  pid=3152 comm="syzkaller702871" path="/root/syzkaller702871058" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:344 [inline]
BUG: KASAN: slab-out-of-bounds in pfkey_msg2xfrm_state net/key/af_key.c:1173 [inline]
BUG: KASAN: slab-out-of-bounds in pfkey_add+0x259e/0x3270 net/key/af_key.c:1491
Read of size 8192 at addr ffff8801c9af6598 by task syzkaller702871/3152

CPU: 0 PID: 3152 Comm: syzkaller702871 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
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x137/0x190 mm/kasan/kasan.c:267
 memcpy+0x23/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:344 [inline]
 pfkey_msg2xfrm_state net/key/af_key.c:1173 [inline]
 pfkey_add+0x259e/0x3270 net/key/af_key.c:1491
 pfkey_process+0x60b/0x720 net/key/af_key.c:2809
 pfkey_sendmsg+0x4d6/0x9f0 net/key/af_key.c:3648
 sock_sendmsg_nosec net/socket.c:628 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:638
 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2018
 __sys_sendmsg+0xe5/0x210 net/socket.c:2052
 SYSC_sendmsg net/socket.c:2063 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2059
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x43ff39
RSP: 002b:00007ffd9f84cc98 EFLAGS: 00000203 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043ff39
RDX: 0000000000000000 RSI: 00000000205f5000 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000203 R12: 00000000004018a0
R13: 0000000000401930 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 3152:
 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]
 pfkey_sendmsg+0x20f/0x9f0 net/key/af_key.c:3635
 sock_sendmsg_nosec net/socket.c:628 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:638
 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2018
 __sys_sendmsg+0xe5/0x210 net/socket.c:2052
 SYSC_sendmsg net/socket.c:2063 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2059
 entry_SYSCALL_64_fastpath+0x1f/0x96

Freed by task 1607:
 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
 skb_free_head+0x74/0xb0 net/core/skbuff.c:550
 skb_release_data+0x58c/0x790 net/core/skbuff.c:570
 skb_release_all+0x4a/0x60 net/core/skbuff.c:627
 __kfree_skb net/core/skbuff.c:641 [inline]
 consume_skb+0x153/0x490 net/core/skbuff.c:701
 skb_free_datagram+0x1a/0xe0 net/core/datagram.c:329
 unix_dgram_recvmsg+0xd12/0x1990 net/unix/af_unix.c:2184
 sock_recvmsg_nosec net/socket.c:801 [inline]
 sock_recvmsg+0xc9/0x110 net/socket.c:808
 SYSC_recvfrom+0x2e5/0x5a0 net/socket.c:1771
 SyS_recvfrom+0x40/0x50 net/socket.c:1743
 entry_SYSCALL_64_fastpath+0x1f/0x96

The buggy address belongs to the object at ffff8801c9af6580
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 512-byte region [ffff8801c9af6580, ffff8801c9af6780)
The buggy address belongs to the page:
page:ffffea000726bd80 count:1 mapcount:0 mapping:ffff8801c9af6080 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801c9af6080 0000000000000000 0000000100000006
raw: ffffea000726b520 ffffea000726a2e0 ffff8801dac00940 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c9af6680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c9af6700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801c9af6780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff8801c9af6800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801c9af6880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================