linux-kernel - Re: [syzbot] [kernel?] general protection fault in device

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Message-ID: <6767183f.050a0220.226966.0014.GAE@google.com>
Date: Sat, 21 Dec 2024 11:34:23 -0800
From: syzbot <syzbot+1f4e278e8e1a9b01f95f@...kaller.appspotmail.com>
To: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, 
	netdev@...r.kernel.org, rafael@...nel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kernel?] general protection fault in device_move

syzbot has found a reproducer for the following issue on:

HEAD commit:    499551201b5f Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14c81fe8580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4f1586bab1323870
dashboard link: https://syzkaller.appspot.com/bug?extid=1f4e278e8e1a9b01f95f
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12c81fe8580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-49955120.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/43341c129049/vmlinux-49955120.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7a854e2daaae/bzImage-49955120.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1f4e278e8e1a9b01f95f@...kaller.appspotmail.com

Oops: general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f]
CPU: 0 UID: 0 PID: 6777 Comm: syz.7.38 Not tainted 6.13.0-rc3-syzkaller-00209-g499551201b5f #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:klist_put+0x4d/0x1b0 lib/klist.c:212
Code: c1 ea 03 80 3c 02 00 0f 85 5f 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 49 83 e4 fe 49 8d 7c 24 58 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 2e 01 00 00 4c 89 e7 4d 8b 74 24 58 e8 7c ce 0c
RSP: 0018:ffffc9000448f6d0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8880302eb060 RCX: 0000000000000000
RDX: 000000000000000b RSI: ffffffff8b1f62c5 RDI: 0000000000000058
RBP: 0000000000000001 R08: 0000000000000000 R09: fffffbfff2085610
R10: ffffffff9042b083 R11: 0000000000000003 R12: 0000000000000000
R13: 0000000000000001 R14: 1ffff92000891ee2 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88806a600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557dd40787d8 CR3: 000000003095e000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 klist_del lib/klist.c:230 [inline]
 klist_remove+0x140/0x2b0 lib/klist.c:249
 device_move+0x12d/0x10b0 drivers/base/core.c:4636
 hci_conn_del_sysfs+0x81/0x170 net/bluetooth/hci_sysfs.c:75
 hci_conn_cleanup net/bluetooth/hci_conn.c:174 [inline]
 hci_conn_del+0x54e/0xdb0 net/bluetooth/hci_conn.c:1164
 hci_conn_hash_flush+0x4bf/0x790 net/bluetooth/hci_conn.c:2699
 hci_dev_close_sync+0x603/0x11a0 net/bluetooth/hci_sync.c:5212
 hci_dev_do_close+0x2e/0x90 net/bluetooth/hci_core.c:482
 hci_unregister_dev+0x213/0x620 net/bluetooth/hci_core.c:2697
 vhci_release+0x79/0xf0 drivers/bluetooth/hci_vhci.c:664
 __fput+0x3f8/0xb60 fs/file_table.c:450
 task_work_run+0x14e/0x250 kernel/task_work.c:239
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0xad8/0x2d70 kernel/exit.c:938
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1087
 get_signal+0x24ed/0x26c0 kernel/signal.c:3017
 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe5b7bb85e5
Code: Unable to access opcode bytes at 0x7fe5b7bb85bb.
RSP: 002b:00007fe5b8974f80 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007fe5b7d75fa0 RCX: 00007fe5b7bb85e5
RDX: 00007fe5b8974fc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fe5b7c01aa8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe5b7d75fa0 R15: 00007ffda9a5cfa8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:klist_put+0x4d/0x1b0 lib/klist.c:212
Code: c1 ea 03 80 3c 02 00 0f 85 5f 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 49 83 e4 fe 49 8d 7c 24 58 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 2e 01 00 00 4c 89 e7 4d 8b 74 24 58 e8 7c ce 0c
RSP: 0018:ffffc9000448f6d0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8880302eb060 RCX: 0000000000000000
RDX: 000000000000000b RSI: ffffffff8b1f62c5 RDI: 0000000000000058
RBP: 0000000000000001 R08: 0000000000000000 R09: fffffbfff2085610
R10: ffffffff9042b083 R11: 0000000000000003 R12: 0000000000000000
R13: 0000000000000001 R14: 1ffff92000891ee2 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88806a600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557dd40787d8 CR3: 0000000029cf2000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	c1 ea 03             	shr    $0x3,%edx
   3:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   7:	0f 85 5f 01 00 00    	jne    0x16c
   d:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  14:	fc ff df
  17:	4c 8b 23             	mov    (%rbx),%r12
  1a:	49 83 e4 fe          	and    $0xfffffffffffffffe,%r12
  1e:	49 8d 7c 24 58       	lea    0x58(%r12),%rdi
  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 2e 01 00 00    	jne    0x162
  34:	4c 89 e7             	mov    %r12,%rdi
  37:	4d 8b 74 24 58       	mov    0x58(%r12),%r14
  3c:	e8                   	.byte 0xe8
  3d:	7c ce                	jl     0xd
  3f:	0c                   	.byte 0xc


---
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.