audit: type=1400 audit(1601770290.364:8): avc:  denied  { execmem } for  pid=6471 comm="syz-executor353" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
ntfs: (device loop0): is_boot_sector_ntfs(): Invalid end of sector marker.
==================================================================
BUG: KASAN: slab-out-of-bounds in ntfs_attr_find+0xa42/0xb70 fs/ntfs/attrib.c:613
Read of size 4 at addr ffff8880a539403f by task syz-executor353/6471

CPU: 0 PID: 6471 Comm: syz-executor353 Not tainted 4.19.149-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x22c/0x33e lib/dump_stack.c:118
 print_address_description.cold+0x56/0x25c mm/kasan/report.c:256
 kasan_report_error.cold+0x66/0xb9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load_n_noabort+0x8b/0xa0 mm/kasan/report.c:443
 ntfs_attr_find+0xa42/0xb70 fs/ntfs/attrib.c:613
 ntfs_attr_lookup+0x1087/0x2060 fs/ntfs/attrib.c:1203
 ntfs_read_inode_mount+0x7e4/0x23b0 fs/ntfs/inode.c:1858
 ntfs_fill_super+0x1761/0x89d2 fs/ntfs/super.c:2871
 mount_bdev+0x2fc/0x3b0 fs/super.c:1158
 mount_fs+0xa3/0x318 fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2469 [inline]
 do_mount+0x51c/0x2f10 fs/namespace.c:2799
 ksys_mount+0xcf/0x130 fs/namespace.c:3015
 __do_sys_mount fs/namespace.c:3029 [inline]
 __se_sys_mount fs/namespace.c:3026 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3026
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x44c1fa
Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffc1695edb8 EFLAGS: 00000287 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc1695ee10 RCX: 000000000044c1fa
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffc1695edd0
RBP: 00007ffc1695edd0 R08: 00007ffc1695ee10 R09: 00007ffc00000015
R10: 0000000000000000 R11: 0000000000000287 R12: 000000000000025d
R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003

Allocated by task 6471:
 kmem_cache_alloc_trace+0x12f/0x4b0 mm/slab.c:3625
 kmalloc include/linux/slab.h:515 [inline]
 copy_mount_options+0x59/0x370 fs/namespace.c:2678
 ksys_mount+0x9b/0x130 fs/namespace.c:3010
 __do_sys_mount fs/namespace.c:3029 [inline]
 __se_sys_mount fs/namespace.c:3026 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3026
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8880a5394e40
 which belongs to the cache kmalloc-4096 of size 4096
The buggy address is located 3585 bytes to the left of
 4096-byte region [ffff8880a5394e40, ffff8880a5395e40)
The buggy address belongs to the page:
page:ffffea000294e500 count:1 mapcount:0 mapping:ffff88812c3f6dc0 index:0x0 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffffea0002935608 ffffea0002920408 ffff88812c3f6dc0
raw: 0000000000000000 ffff8880a5394e40 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a5393f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880a5393f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8880a5394000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                        ^
 ffff8880a5394080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a5394100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================