[PATCH 06/11] nvme: Implement In-Band authentication

[Sagi Grimberg]

> Looks like if I pass a malformed ctrl key to nvme connect I am able to
> crash the system:

This was what I used in this:
$ nvme connect -a 192.168.123.1 -t tcp  -s 8009 -n testnqn1 -S 
"DHHC-1:00:QpxVGpctx5J+4SeW2MClUI8rfZO3WdP1llImvsPsx7e3TK+I:" -C 
"DHHC-1:00:Jc/My1o0qtLCWRp+sHhAVafdfaS7YQOMYhk9zSmlatobqB8C:"

The dhchap_ctrl_key is the offending string...

> -- 
> [   84.793307] Workqueue: nvme-wq __nvme_auth_work [nvme_core]
> [   84.794790] RIP: 0010:nvme_auth_transform_key+0x19/0x1f0 [nvme_common]
> [   84.796468] Code: bc f4 ff ff ff eb bf e8 f5 2f e1 ee 0f 1f 44 00 00 
> 0f 1f 44 00 00 41 57 41 56 41 55 49 89 f5 41 54 55 53 48 89 fb 48 83 ec 
> 08 <0f> b6 7f 10 e8 ce f9 ff ff 48 89 c7 0f b6 43 10 84 c0 0f 84 4c 01
> [   84.800112] RSP: 0018:ffffae5f8047bc78 EFLAGS: 00010296
> [   84.801048] RAX: ffff973b854ca0c0 RBX: 0000000000000000 RCX: 
> 0000000000000000
> [   84.802289] RDX: ffff973b8355b000 RSI: ffff973b84f568a0 RDI: 
> 0000000000000000
> [   84.803447] RBP: ffff973b842dd6b9 R08: 0000000000000003 R09: 
> ffff973bbec308a8
> [   84.804638] R10: 0000000000000147 R11: 0000000000000000 R12: 
> ffff973b842dd600
> [   84.805767] R13: ffff973b84f568a0 R14: 0000000000000000 R15: 
> ffff973b9e94250d
> [   84.806929] FS:  0000000000000000(0000) GS:ffff973bbec00000(0000) 
> knlGS:0000000000000000
> [   84.808220] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [   84.809178] CR2: 0000000000000010 CR3: 00000000061ac003 CR4: 
> 0000000000370ef0
> [   84.810337] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
> 0000000000000000
> [   84.811432] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
> 0000000000000400
> [   84.812527] Call Trace:
> [   84.812974]  <TASK>
> [   84.813372]  nvme_auth_dhchap_setup_ctrl_response+0x4b/0x3b0 [nvme_core]
> [   84.814355]  ? preempt_count_add+0x68/0xa0
> [   84.815080]  ? _raw_spin_unlock_irq+0x16/0x28
> [   84.815840]  ? __wait_for_common+0x19f/0x1d0
> [   84.816587]  ? firmware_map_remove+0x87/0x87
> [   84.817333]  ? blk_mq_hctx_has_pending+0x38/0x70
> [   84.818123]  ? blk_mq_run_hw_queue+0x7d/0xe0
> [   84.818784]  ? __blk_mq_free_request+0x9b/0xa0
> [   84.819482]  ? blk_queue_exit+0xe/0x40
> [   84.820124]  ? __nvme_submit_sync_cmd+0xe8/0x160 [nvme_core]
> [   84.821096]  ? nvme_auth_submit+0x8f/0xd0 [nvme_core]
> [   84.821970]  __nvme_auth_work+0x1fb/0x480 [nvme_core]
> [   84.822869]  process_one_work+0x1e5/0x3b0
> [   84.823608]  worker_thread+0x1c4/0x3a0
> [   84.824343]  ? rescuer_thread+0x390/0x390
> [   84.825044]  kthread+0xe8/0x110
> --