audit: type=1400 audit(1603222015.122:8): avc: denied { execmem } for pid=6500 comm="syz-executor487" 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 ffff8880a41f423f by task syz-executor487/6500
CPU: 1 PID: 6500 Comm: syz-executor487 Not tainted 4.19.152-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:00007fff8f7b42f8 EFLAGS: 00000287 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fff8f7b4350 RCX: 000000000044c1fa
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fff8f7b4310
RBP: 00007fff8f7b4310 R08: 00007fff8f7b4350 R09: 00007fff00000015
R10: 0000000000000000 R11: 0000000000000287 R12: 000000000000025d
R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003
Allocated by task 6500:
kmem_cache_alloc+0x126/0x4a0 mm/slab.c:3559
getname_flags+0xce/0x590 fs/namei.c:140
user_path_at_empty+0x2a/0x50 fs/namei.c:2609
user_path_at include/linux/namei.h:57 [inline]
vfs_statx+0x113/0x210 fs/stat.c:185
vfs_stat include/linux/fs.h:3133 [inline]
__do_sys_newstat fs/stat.c:337 [inline]
__se_sys_newstat+0x96/0x120 fs/stat.c:333
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 6500:
__cache_free mm/slab.c:3503 [inline]
kmem_cache_free+0x7f/0x2b0 mm/slab.c:3765
putname+0xe1/0x130 fs/namei.c:261
filename_lookup+0x3d0/0x5a0 fs/namei.c:2358
user_path_at include/linux/namei.h:57 [inline]
vfs_statx+0x113/0x210 fs/stat.c:185
vfs_stat include/linux/fs.h:3133 [inline]
__do_sys_newstat fs/stat.c:337 [inline]
__se_sys_newstat+0x96/0x120 fs/stat.c:333
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8880a41f47c0
which belongs to the cache names_cache of size 4096
The buggy address is located 1409 bytes to the left of
4096-byte region [ffff8880a41f47c0, ffff8880a41f57c0)
The buggy address belongs to the page:
page:ffffea0002907d00 count:1 mapcount:0 mapping:ffff88821bc44b00 index:0x0 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffffea000290ed88 ffffea000240a888 ffff88821bc44b00
raw: 0000000000000000 ffff8880a41f47c0 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880a41f4100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880a41f4180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880a41f4200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff8880a41f4280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880a41f4300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================