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Date:   Thu, 02 Jun 2022 20:55:12 -0700
In-Reply-To: <20220603033532.5154-1-hdanton@sina.com>
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Subject: Re: [syzbot] general protection fault in __device_attach
From:   syzbot <syzbot+dd3c97de244683533381@syzkaller.appspotmail.com>
To:     hdanton@sina.com, linux-kernel@vger.kernel.org,
        syzkaller-bugs@googlegroups.com
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Precedence: bulk

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
general protection fault in __device_attach

usb usb9: device_add((null)) --> -22
general protection fault, probably for non-canonical address 0xdffffc0000000021: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f]
CPU: 1 PID: 4084 Comm: syz-executor.0 Not tainted 5.18.0-syzkaller-11972-gd1dc87763f40-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__device_attach+0xad/0x4a0 drivers/base/dd.c:948
Code: e8 03 42 80 3c 20 00 0f 85 a3 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 65 48 49 8d bc 24 08 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 06 0f 8e 6e 03 00 00 45 0f b6 b4 24 08 01 00
RSP: 0018:ffffc90003347b98 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 1ffff92000668f74 RCX: 0000000000000000
RDX: 0000000000000021 RSI: 0000000000000002 RDI: 0000000000000108
RBP: ffff888021878030 R08: 0000000000000000 R09: ffffffff8dbb1097
R10: fffffbfff1b76212 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 00000000fffffff0 R15: ffff8880218780b0
FS:  00007f8da1571700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8da059d090 CR3: 000000006b626000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 proc_ioctl.part.0+0x48e/0x560 drivers/usb/core/devio.c:2356
 proc_ioctl drivers/usb/core/devio.c:182 [inline]
 proc_ioctl_default drivers/usb/core/devio.c:2391 [inline]
 usbdev_do_ioctl drivers/usb/core/devio.c:2747 [inline]
 usbdev_ioctl+0x2c08/0x36f0 drivers/usb/core/devio.c:2807
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f8da0489109
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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:00007f8da1571168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8da059bf60 RCX: 00007f8da0489109
RDX: 0000000020000040 RSI: 00000000c0105512 RDI: 0000000000000005
RBP: 00007f8da04e308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff3b94a64f R14: 00007f8da1571300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__device_attach+0xad/0x4a0 drivers/base/dd.c:948
Code: e8 03 42 80 3c 20 00 0f 85 a3 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 65 48 49 8d bc 24 08 01 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 06 0f 8e 6e 03 00 00 45 0f b6 b4 24 08 01 00
RSP: 0018:ffffc90003347b98 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 1ffff92000668f74 RCX: 0000000000000000
RDX: 0000000000000021 RSI: 0000000000000002 RDI: 0000000000000108
RBP: ffff888021878030 R08: 0000000000000000 R09: ffffffff8dbb1097
R10: fffffbfff1b76212 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 00000000fffffff0 R15: ffff8880218780b0
FS:  00007f8da1571700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8da059d090 CR3: 000000006b626000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	e8 03 42 80 3c       	callq  0x3c804208
   5:	20 00                	and    %al,(%rax)
   7:	0f 85 a3 03 00 00    	jne    0x3b0
   d:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  14:	fc ff df
  17:	4c 8b 65 48          	mov    0x48(%rbp),%r12
  1b:	49 8d bc 24 08 01 00 	lea    0x108(%r12),%rdi
  22:	00
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 06                	je     0x38
  32:	0f 8e 6e 03 00 00    	jle    0x3a6
  38:	45                   	rex.RB
  39:	0f                   	.byte 0xf
  3a:	b6 b4                	mov    $0xb4,%dh
  3c:	24 08                	and    $0x8,%al
  3e:	01 00                	add    %eax,(%rax)


Tested on:

commit:         d1dc8776 assoc_array: Fix BUG_ON during garbage collect
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=113f50ddf00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c51cd24814bb5665
dashboard link: https://syzkaller.appspot.com/bug?extid=dd3c97de244683533381
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
patch:          https://syzkaller.appspot.com/x/patch.diff?x=12390667f00000