linux-kernel - [syzbot] [ntfs3?] general protection fault in ntfs_security

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Message-ID: <000000000000f0af6305f05224d8@google.com>
Date:   Wed, 21 Dec 2022 00:14:41 -0800
From:   syzbot <syzbot+f1a57e2f7ecadf4fe2cd@...kaller.appspotmail.com>
To:     almaz.alexandrovich@...agon-software.com,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        nathan@...nel.org, ndesaulniers@...gle.com, ntfs3@...ts.linux.dev,
        syzkaller-bugs@...glegroups.com, trix@...hat.com
Subject: [syzbot] [ntfs3?] general protection fault in ntfs_security_init

Hello,

syzbot found the following issue on:

HEAD commit:    e45fb347b630 Add linux-next specific files for 20221220
git tree:       linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11ebe9d7880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8ae91cba504b4da8
dashboard link: https://syzkaller.appspot.com/bug?extid=f1a57e2f7ecadf4fe2cd
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11079eb3880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10c68630480000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/1ae2b280f860/disk-e45fb347.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/253fc221144a/vmlinux-e45fb347.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e2695a52406f/bzImage-e45fb347.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/03bbfbf19079/mount_3.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f1a57e2f7ecadf4fe2cd@...kaller.appspotmail.com

memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=5070 'syz-executor189'
loop0: detected capacity change from 0 to 4096
ntfs3: loop0: Different NTFS' sector size (4096) and media sector size (512)
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 5070 Comm: syz-executor189 Not tainted 6.1.0-next-20221220-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:ntfs_security_init+0x26e/0xad0 fs/ntfs3/fsntfs.c:1879
Code: 44 24 08 83 f8 1f 0f 86 a4 06 00 00 e8 1b 52 d1 fe 49 01 ec e8 13 52 d1 fe 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 0f
RSP: 0018:ffffc90003b9fa78 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88807612a000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff82b002cd RDI: 0000000000000005
RBP: ffff8880791aa160 R08: 0000000000000005 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880735744b0 R14: ffffc90003b9fad0 R15: ffff88807612a460
FS:  000055555681e3c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200001c0 CR3: 000000007cd11000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ntfs_fill_super+0x3398/0x3ab0 fs/ntfs3/super.c:1287
 get_tree_bdev+0x444/0x760 fs/super.c:1282
 vfs_get_tree+0x8d/0x2f0 fs/super.c:1489
 do_new_mount fs/namespace.c:3145 [inline]
 path_mount+0x132a/0x1e20 fs/namespace.c:3475
 do_mount fs/namespace.c:3488 [inline]
 __do_sys_mount fs/namespace.c:3697 [inline]
 __se_sys_mount fs/namespace.c:3674 [inline]
 __x64_sys_mount+0x283/0x300 fs/namespace.c:3674
 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: 0033:0x7f6957d4530a
Code: 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc02858c98 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f6957d4530a
RDX: 000000002001f180 RSI: 000000002001f1c0 RDI: 00007ffc02858cb0
RBP: 00007ffc02858cb0 R08: 00007ffc02858cf0 R09: 000000000001f164
R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000005
R13: 000055555681e380 R14: 0000000000000000 R15: 00007ffc02858cf0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ntfs_security_init+0x26e/0xad0 fs/ntfs3/fsntfs.c:1879
Code: 44 24 08 83 f8 1f 0f 86 a4 06 00 00 e8 1b 52 d1 fe 49 01 ec e8 13 52 d1 fe 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 0f
RSP: 0018:ffffc90003b9fa78 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88807612a000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff82b002cd RDI: 0000000000000005
RBP: ffff8880791aa160 R08: 0000000000000005 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880735744b0 R14: ffffc90003b9fad0 R15: ffff88807612a460
FS:  000055555681e3c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200001c0 CR3: 000000007cd11000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	44 24 08             	rex.R and $0x8,%al
   3:	83 f8 1f             	cmp    $0x1f,%eax
   6:	0f 86 a4 06 00 00    	jbe    0x6b0
   c:	e8 1b 52 d1 fe       	callq  0xfed1522c
  11:	49 01 ec             	add    %rbp,%r12
  14:	e8 13 52 d1 fe       	callq  0xfed1522c
  19:	4c 89 e2             	mov    %r12,%rdx
  1c:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  23:	fc ff df
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx <-- trapping instruction
  2e:	4c 89 e0             	mov    %r12,%rax
  31:	83 e0 07             	and    $0x7,%eax
  34:	83 c0 03             	add    $0x3,%eax
  37:	38 d0                	cmp    %dl,%al
  39:	7c 08                	jl     0x43
  3b:	84 d2                	test   %dl,%dl
  3d:	0f                   	.byte 0xf
  3e:	85 0f                	test   %ecx,(%rdi)


---
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