linux-kernel - Re: [PATCH v2 1/2] nvmet: Fix use-after-free bug when a port is removed

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Date:   Fri, 5 Jul 2019 15:17:56 +0300
From:   Max Gurtovoy <maxg@...lanox.com>
To:     Logan Gunthorpe <logang@...tatee.com>,
        <linux-kernel@...r.kernel.org>, <linux-nvme@...ts.infradead.org>,
        Christoph Hellwig <hch@....de>,
        "Sagi Grimberg" <sagi@...mberg.me>
CC:     Stephen Bates <sbates@...thlin.com>
Subject: Re: [PATCH v2 1/2] nvmet: Fix use-after-free bug when a port is
 removed


On 7/5/2019 12:01 AM, Logan Gunthorpe wrote:
>
> On 2019-07-04 3:00 p.m., Max Gurtovoy wrote:
>> Hi Logan,
>>
>> On 7/4/2019 2:03 AM, Logan Gunthorpe wrote:
>>> When a port is removed through configfs, any connected controllers
>>> are still active and can still send commands. This causes a
>>> use-after-free bug which is detected by KASAN for any admin command
>>> that dereferences req->port (like in nvmet_execute_identify_ctrl).
>>>
>>> To fix this, disconnect all active controllers when a subsystem is
>>> removed from a port. This ensures there are no active controllers
>>> when the port is eventually removed.
>> so now we are enforcing controller existence with port configfs, right ?
>> sounds reasonable.
> Correct.
>
>> Did you run your patches with other transport (RDMA/TCP/FC) ?
> Just RDMA and loop. I suppose I could test with TCP but I don't have FC
> hardware.

Great.

the code looks good:

Reviewed-by: Max Gurtovoy <maxg@...lanox.com>

>
> Logan