audit: type=1400 audit(1514540567.837:7): avc:  denied  { map } for  pid=3152 comm="syzkaller592168" path="/root/syzkaller592168691" 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 cap_convert_nscap+0x501/0x610 security/commoncap.c:498
Read of size 4 at addr ffff8801c93ad480 by task syzkaller592168/3152

CPU: 0 PID: 3152 Comm: syzkaller592168 Not tainted 4.15.0-rc4-next-20171221+ #78
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
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429
 cap_convert_nscap+0x501/0x610 security/commoncap.c:498
 setxattr+0x365/0x400 fs/xattr.c:446
 SYSC_fsetxattr fs/xattr.c:508 [inline]
 SyS_fsetxattr+0x130/0x190 fs/xattr.c:497
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x43fcb9
RSP: 002b:00007ffc1f266208 EFLAGS: 00000203 ORIG_RAX: 00000000000000be
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fcb9
RDX: 00000000209b8000 RSI: 0000000020d4bfe8 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000203 R12: 0000000000401620
R13: 00000000004016b0 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:3673 [inline]
 __kmalloc_node+0x47/0x70 mm/slab.c:3680
 kmalloc_node include/linux/slab.h:558 [inline]
 kvmalloc_node+0x99/0xd0 mm/util.c:397
 kvmalloc include/linux/mm.h:541 [inline]
 setxattr+0x152/0x400 fs/xattr.c:435
 SYSC_fsetxattr fs/xattr.c:508 [inline]
 SyS_fsetxattr+0x130/0x190 fs/xattr.c:497
 entry_SYSCALL_64_fastpath+0x1f/0x96

Freed by task 1667:
 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:3489 [inline]
 kfree+0xd6/0x260 mm/slab.c:3804
 selinux_sk_free_security+0x4f/0x60 security/selinux/hooks.c:4909
 security_sk_free+0x48/0x80 security/security.c:1431
 sk_prot_free net/core/sock.c:1504 [inline]
 __sk_destruct+0x609/0x910 net/core/sock.c:1590
 sk_destruct+0x47/0x80 net/core/sock.c:1598
 __sk_free+0xf1/0x2b0 net/core/sock.c:1609
 sk_free+0x2a/0x40 net/core/sock.c:1620
 sock_put include/net/sock.h:1654 [inline]
 unix_release_sock+0x644/0xc10 net/unix/af_unix.c:566
 unix_stream_connect+0x884/0x1580 net/unix/af_unix.c:1375
 SYSC_connect+0x213/0x4a0 net/socket.c:1611
 SyS_connect+0x24/0x30 net/socket.c:1592
 entry_SYSCALL_64_fastpath+0x1f/0x96

The buggy address belongs to the object at ffff8801c93ad480
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff8801c93ad480, ffff8801c93ad4a0)
The buggy address belongs to the page:
page:00000000e3b3898d count:1 mapcount:0 mapping:000000002b0c3da6 index:0xffff8801c93adfc1
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801c93ad000 ffff8801c93adfc1 000000010000003f
raw: ffffea000724e5e0 ffffea000724b160 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c93ad380: 00 00 00 fc fc fc fc fc 00 00 01 fc fc fc fc fc
 ffff8801c93ad400: 00 00 00 fc fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801c93ad480: 01 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
                   ^
 ffff8801c93ad500: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801c93ad580: 00 00 01 fc fc fc fc fc fb fb fb fb fc fc fc fc
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