[ntfs3?] general protection fault in attr_data_read_resident

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syzbot

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Feb 3, 2023, 7:51:58 AM2/3/23
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Hello,

syzbot found the following issue on:

HEAD commit: e2f86c02fdc9 Add linux-next specific files for 20230127
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1748c8dd480000
kernel config: https://syzkaller.appspot.com/x/.config?x=920c61956db733da
dashboard link: https://syzkaller.appspot.com/bug?extid=f9d08d0a84250cae0692
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
CC: [almaz.ale...@paragon-software.com linux-...@vger.kernel.org nt...@lists.linux.dev]

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ff04f1611fad/disk-e2f86c02.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/67928a8622d3/vmlinux-e2f86c02.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b444a3d78556/bzImage-e2f86c02.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f9d08d...@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
CPU: 1 PID: 14773 Comm: syz-executor.2 Not tainted 6.2.0-rc5-next-20230127-syzkaller-08766-ge2f86c02fdc9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
RIP: 0010:attr_data_read_resident+0xa0/0x6d0 fs/ntfs3/attrib.c:1233
Code: 89 e6 e8 63 69 d1 fe 45 84 e4 0f 85 66 03 00 00 e8 45 6d d1 fe 48 8d 7d 20 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 be 05 00 00 48 8d 7b 10 4c 8b 65 20 48 b8 00 00
RSP: 0018:ffffc90005537a30 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88809da12108 RCX: ffffc9000b4e9000
RDX: 0000000000000004 RSI: ffffffff82b347db RDI: 0000000000000020
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88809b576000 R14: 000000000000000c R15: ffff888088876ea0
FS: 00007f157dbfe700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3352b000 CR3: 000000002a6a6000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
ntfs_get_block_vbo+0x643/0xec0 fs/ntfs3/inode.c:572
generic_block_bmap+0x127/0x1a0 fs/buffer.c:2690
bmap+0xae/0x120 fs/inode.c:1799
ioctl_fibmap fs/ioctl.c:77 [inline]
file_ioctl fs/ioctl.c:327 [inline]
do_vfs_ioctl+0xe45/0x1670 fs/ioctl.c:849
__do_sys_ioctl fs/ioctl.c:868 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x10c/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f157f08c0c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f157dbfe168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f157f1abf80 RCX: 00007f157f08c0c9
RDX: 0000000020000200 RSI: 0000000000000001 RDI: 0000000000000004
RBP: 00007f157f0e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe33418d1f R14: 00007f157dbfe300 R15: 0000000000022000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:attr_data_read_resident+0xa0/0x6d0 fs/ntfs3/attrib.c:1233
Code: 89 e6 e8 63 69 d1 fe 45 84 e4 0f 85 66 03 00 00 e8 45 6d d1 fe 48 8d 7d 20 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 be 05 00 00 48 8d 7b 10 4c 8b 65 20 48 b8 00 00
RSP: 0018:ffffc90005537a30 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88809da12108 RCX: ffffc9000b4e9000
RDX: 0000000000000004 RSI: ffffffff82b347db RDI: 0000000000000020
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88809b576000 R14: 000000000000000c R15: ffff888088876ea0
FS: 00007f157dbfe700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4a4fd821b8 CR3: 000000002a6a6000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 89 e6 mov %esp,%esi
2: e8 63 69 d1 fe callq 0xfed1696a
7: 45 84 e4 test %r12b,%r12b
a: 0f 85 66 03 00 00 jne 0x376
10: e8 45 6d d1 fe callq 0xfed16d5a
15: 48 8d 7d 20 lea 0x20(%rbp),%rdi
19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
20: fc ff df
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 be 05 00 00 jne 0x5f2
34: 48 8d 7b 10 lea 0x10(%rbx),%rdi
38: 4c 8b 65 20 mov 0x20(%rbp),%r12
3c: 48 rex.W
3d: b8 .byte 0xb8


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syzbot

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Jun 3, 2023, 9:38:03 AM6/3/23
to syzkaller-upst...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
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