audit: type=1400 audit(1514506950.280:7): avc:  denied  { map } for  pid=3153 comm="syzkaller586394" path="/root/syzkaller586394583" 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 ffff8801caa0b298 by task syzkaller586394/3153

CPU: 1 PID: 3153 Comm: syzkaller586394 Not tainted 4.15.0-rc5+ #149
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:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 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:636 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:646
 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2026
 __sys_sendmsg+0xe5/0x210 net/socket.c:2060
 C_SYSC_sendmsg net/compat.c:739 [inline]
 compat_SyS_sendmsg+0x2a/0x40 net/compat.c:737
 do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
 do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
 entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7f20c79
RSP: 002b:00000000ffc64b4c EFLAGS: 00000203 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000205f5000
RDX: 0000000000000000 RSI: 0000000000000167 RDI: 000000000000000f
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 3153:
 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:3672 [inline]
 __kmalloc_node_track_caller+0x47/0x70 mm/slab.c:3686
 __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:636 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:646
 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2026
 __sys_sendmsg+0xe5/0x210 net/socket.c:2060
 C_SYSC_sendmsg net/compat.c:739 [inline]
 compat_SyS_sendmsg+0x2a/0x40 net/compat.c:737
 do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
 do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
 entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:125

Freed by task 1605:
 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:3488 [inline]
 kfree+0xd6/0x260 mm/slab.c:3803
 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:331
 unix_dgram_recvmsg+0xd12/0x1990 net/unix/af_unix.c:2184
 sock_recvmsg_nosec net/socket.c:809 [inline]
 sock_recvmsg+0xc9/0x110 net/socket.c:816
 SYSC_recvfrom+0x2e5/0x5a0 net/socket.c:1779
 SyS_recvfrom+0x40/0x50 net/socket.c:1751
 entry_SYSCALL_64_fastpath+0x1f/0x96

The buggy address belongs to the object at ffff8801caa0b280
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 512-byte region [ffff8801caa0b280, ffff8801caa0b480)
The buggy address belongs to the page:
page:00000000bb3aca4d count:1 mapcount:0 mapping:00000000aa303d72 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801caa0b000 0000000000000000 0000000100000006
raw: ffffea0007278da0 ffffea0007244960 ffff8801db000940 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801caa0b380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801caa0b400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801caa0b480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff8801caa0b500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801caa0b580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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