audit: type=1400 audit(1512783924.045:7): avc:  denied  { map } for  pid=3151 comm="syzkaller934629" path="/root/syzkaller934629588" 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 sha3_update+0xdf/0x2e0 crypto/sha3_generic.c:161
Write of size 192 at addr ffff8801c5bb78fc by task syzkaller934629/3151

CPU: 1 PID: 3151 Comm: syzkaller934629 Not tainted 4.15.0-rc2-mm1+ #39
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+0x37/0x50 mm/kasan/kasan.c:303
 memcpy include/linux/string.h:344 [inline]
 sha3_update+0xdf/0x2e0 crypto/sha3_generic.c:161
 crypto_shash_update+0xcb/0x220 crypto/shash.c:110
 hmac_update+0x7e/0xa0 crypto/hmac.c:122
 crypto_shash_update+0xcb/0x220 crypto/shash.c:110
 kdf_ctr security/keys/dh.c:181 [inline]
 keyctl_dh_compute_kdf security/keys/dh.c:226 [inline]
 __keyctl_dh_compute+0x16d8/0x1a00 security/keys/dh.c:398
 keyctl_dh_compute+0xac/0xf3 security/keys/dh.c:434
 SYSC_keyctl security/keys/keyctl.c:1745 [inline]
 SyS_keyctl+0x72/0x2c0 security/keys/keyctl.c:1641
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x43fe89
RSP: 002b:00007ffdc7af3ec8 EFLAGS: 00000203 ORIG_RAX: 00000000000000fa
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe89
RDX: 00000000205cd000 RSI: 00000000204c8ff4 RDI: 0000000000000017
RBP: 00000000006ca018 R08: 0000000020550000 R09: 0000000000000000
R10: 0000000000000030 R11: 0000000000000203 R12: 00000000004017f0
R13: 0000000000401880 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 3151:
 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 mm/slab.c:3712 [inline]
 __kmalloc+0x162/0x760 mm/slab.c:3721
 kmalloc include/linux/slab.h:521 [inline]
 kdf_alloc security/keys/dh.c:111 [inline]
 __keyctl_dh_compute+0x2a1/0x1a00 security/keys/dh.c:288
 keyctl_dh_compute+0xac/0xf3 security/keys/dh.c:434
 SYSC_keyctl security/keys/keyctl.c:1745 [inline]
 SyS_keyctl+0x72/0x2c0 security/keys/keyctl.c:1641
 entry_SYSCALL_64_fastpath+0x1f/0x96

Freed by task 1672:
 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:3492 [inline]
 kfree+0xca/0x250 mm/slab.c:3807
 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
 netlink_recvmsg+0x5c6/0x1300 net/netlink/af_netlink.c:1940
 sock_recvmsg_nosec net/socket.c:809 [inline]
 sock_recvmsg+0xc9/0x110 net/socket.c:816
 ___sys_recvmsg+0x29b/0x630 net/socket.c:2185
 __sys_recvmsg+0xe2/0x210 net/socket.c:2230
 SYSC_recvmsg net/socket.c:2242 [inline]
 SyS_recvmsg+0x2d/0x50 net/socket.c:2237
 entry_SYSCALL_64_fastpath+0x1f/0x96

The buggy address belongs to the object at ffff8801c5bb7800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 252 bytes inside of
 512-byte region [ffff8801c5bb7800, ffff8801c5bb7a00)
The buggy address belongs to the page:
page:00000000799d9b1c count:1 mapcount:0 mapping:0000000037a449e4 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801c5bb7080 0000000000000000 0000000100000006
raw: ffffea00071577a0 ffffea000716ee60 ffff8801dac00940 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c5bb7880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c5bb7900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801c5bb7980: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff8801c5bb7a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801c5bb7a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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