audit: type=1400 audit(1514741068.335:7): avc:  denied  { map } for  pid=3495 comm="syzkaller678274" path="/root/syzkaller678274587" 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_inode_getsecurity+0x621/0x7d0 security/commoncap.c:408
Read of size 4 at addr ffff8801c0960e00 by task syzkaller678274/3495

CPU: 1 PID: 3495 Comm: syzkaller678274 Not tainted 4.15.0-rc5+ #154
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_inode_getsecurity+0x621/0x7d0 security/commoncap.c:408
 security_inode_getsecurity+0xcd/0x110 security/security.c:809
 xattr_getsecurity+0xd3/0x1f0 fs/xattr.c:244
 vfs_getxattr+0xc8/0x110 fs/xattr.c:333
 getxattr+0x116/0x2a0 fs/xattr.c:540
 path_getxattr+0xed/0x170 fs/xattr.c:568
 SYSC_getxattr fs/xattr.c:580 [inline]
 SyS_getxattr+0x33/0x40 fs/xattr.c:577
 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:129
RIP: 0023:0xf7f86c79
RSP: 002b:00000000ffdc08dc EFLAGS: 00000286 ORIG_RAX: 00000000000000e5
RAX: ffffffffffffffda RBX: 000000002072d000 RCX: 0000000020b29f57
RDX: 0000000020227f74 RSI: 000000000000008c RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 3495:
 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:3708 [inline]
 __kmalloc_track_caller+0x15e/0x760 mm/slab.c:3723
 __do_krealloc mm/slab_common.c:1407 [inline]
 krealloc+0x65/0xc0 mm/slab_common.c:1454
 vfs_getxattr_alloc+0x177/0x270 fs/xattr.c:290
 cap_inode_getsecurity+0xfa/0x7d0 security/commoncap.c:399
 security_inode_getsecurity+0xcd/0x110 security/security.c:809
 xattr_getsecurity+0xd3/0x1f0 fs/xattr.c:244
 vfs_getxattr+0xc8/0x110 fs/xattr.c:333
 getxattr+0x116/0x2a0 fs/xattr.c:540
 path_getxattr+0xed/0x170 fs/xattr.c:568
 SYSC_getxattr fs/xattr.c:580 [inline]
 SyS_getxattr+0x33/0x40 fs/xattr.c:577
 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:129

Freed by task 1960:
 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
 single_release+0x88/0xb0 fs/seq_file.c:603
 __fput+0x327/0x7e0 fs/file_table.c:210
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x296/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
 entry_SYSCALL_64_fastpath+0x98/0x9a

The buggy address belongs to the object at ffff8801c0960e00
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff8801c0960e00, ffff8801c0960e20)
The buggy address belongs to the page:
page:00000000361cbf2f count:1 mapcount:0 mapping:000000001c8229e2 index:0xffff8801c0960fc1
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801c0960000 ffff8801c0960fc1 000000010000003f
raw: ffffea00070100e0 ffffea0007018420 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c0960d00: 00 00 00 fc fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801c0960d80: 00 00 00 fc fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801c0960e00: 01 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
                   ^
 ffff8801c0960e80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801c0960f00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================