[syzbot] [ntfs3?] BUG: unable to handle kernel paging request in attr_data_read_resident

syzbot
2023-06-22T22:40:00Z

Hello,

syzbot found the following issue on:

HEAD commit: 177239177378 Merge branch 'for-next/core', remote-tracking..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=10bfc2df280000
kernel config: https://syzkaller.appspot.com/x/.config?x=8776b67768a3c9af
dashboard link: https://syzkaller.appspot.com/bug?extid=33a67f9990381cc8951c
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=139cebf7280000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11cc2187280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0c47a40dd633/disk-17723917.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0ff319b6fb50/vmlinux-17723917.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3ce1ea9e3b7e/Image-17723917.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/795c34a0a0d9/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+33a67f9990381cc8951c@syzkaller.appspotmail.com

memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=5970 'syz-executor312'
loop0: detected capacity change from 0 to 4096
ntfs3: loop0: Different NTFS sector size (4096) and media sector size (512).
Unable to handle kernel paging request at virtual address dfff800000000004
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
Mem abort info:
ESR = 0x0000000096000005
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x05: level 1 translation fault
Data abort info:
ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000
CM = 0, WnR = 0, TnD = 0, TagAccess = 0
GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[dfff800000000004] address between user and kernel address ranges
Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 5970 Comm: syz-executor312 Not tainted 6.4.0-rc5-syzkaller-g177239177378 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : attr_data_read_resident+0xb0/0x6c8 fs/ntfs3/attrib.c:1232
lr : attr_data_read_resident+0x8c/0x6c8 fs/ntfs3/attrib.c:1229
sp : ffff800096ba7620
x29: ffff800096ba7620 x28: 1ffff00012d74ee8 x27: ffff800096ba7740
x26: dfff800000000000 x25: ffff800096ba7730 x24: dfff800000000000
x23: ffff0000e05c7600 x22: 1ffff00012d74ee6 x21: 0000000000000020
x20: ffff0000c7576108 x19: 0000000000000000 x18: ffff800096ba7160
x17: 0000000000000001 x16: ffff80008026c4e4 x15: 000000000000be43
x14: 00000000ffffffff x13: dfff800000000000 x12: 0000000000000001
x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000
x8 : 0000000000000004 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000
x2 : 0000000000000080 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
attr_data_read_resident+0xb0/0x6c8 fs/ntfs3/attrib.c:1232
ntfs_get_block_vbo+0x2b0/0xc14 fs/ntfs3/inode.c:572
ntfs_get_block_bmap+0xa0/0xe0 fs/ntfs3/inode.c:686
generic_block_bmap+0x11c/0x1bc fs/buffer.c:2718
ntfs_bmap+0x30/0x40 fs/ntfs3/inode.c:693
bmap+0xa8/0xe8 fs/inode.c:1798
ioctl_fibmap fs/ioctl.c:77 [inline]
file_ioctl fs/ioctl.c:327 [inline]
do_vfs_ioctl+0x1eb0/0x26f8 fs/ioctl.c:849
__do_sys_ioctl fs/ioctl.c:868 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:856
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x244 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:191
el0_svc+0x4c/0x160 arch/arm64/kernel/entry-common.c:647
el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591
Code: 128002a0 1400011a 91008275 d343fea8 (38786908)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: 128002a0 mov w0, #0xffffffea // #-22
4: 1400011a b 0x46c
8: 91008275 add x21, x19, #0x20
c: d343fea8 lsr x8, x21, #3
* 10: 38786908 ldrb w8, [x8, x24] <-- trapping instruction

---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to change bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup