linux-kernel - Re: [Resend RFC PATCH V2 08/12] UIO/Hyper-V: Not load UIO HV driver in the isolation VM.

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Date:   Thu, 15 Apr 2021 21:09:55 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, hpa@...or.com, arnd@...db.de,
        akpm@...ux-foundation.org, konrad.wilk@...cle.com, hch@....de,
        m.szyprowski@...sung.com, robin.murphy@....com, joro@...tes.org,
        will@...nel.org, davem@...emloft.net, kuba@...nel.org,
        jejb@...ux.ibm.com, martin.petersen@...cle.com,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        iommu@...ts.linux-foundation.org, linux-arch@...r.kernel.org,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-scsi@...r.kernel.org,
        netdev@...r.kernel.org, vkuznets@...hat.com,
        thomas.lendacky@....com, brijesh.singh@....com,
        sunilmut@...rosoft.com
Subject: Re: [Resend RFC PATCH V2 08/12] UIO/Hyper-V: Not load UIO HV driver
 in the isolation VM.



On 4/14/2021 11:45 PM, Greg KH wrote:
> On Wed, Apr 14, 2021 at 10:49:41AM -0400, Tianyu Lan wrote:
>> From: Tianyu Lan <Tianyu.Lan@...rosoft.com>
>>
>> UIO HV driver should not load in the isolation VM for security reason.
>> Return ENOTSUPP in the hv_uio_probe() in the isolation VM.
>>
>> Signed-off-by: Tianyu Lan <Tianyu.Lan@...rosoft.com>
>> ---
>>   drivers/uio/uio_hv_generic.c | 5 +++++
>>   1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c
>> index 0330ba99730e..678b021d66f8 100644
>> --- a/drivers/uio/uio_hv_generic.c
>> +++ b/drivers/uio/uio_hv_generic.c
>> @@ -29,6 +29,7 @@
>>   #include <linux/hyperv.h>
>>   #include <linux/vmalloc.h>
>>   #include <linux/slab.h>
>> +#include <asm/mshyperv.h>
>>   
>>   #include "../hv/hyperv_vmbus.h"
>>   
>> @@ -241,6 +242,10 @@ hv_uio_probe(struct hv_device *dev,
>>   	void *ring_buffer;
>>   	int ret;
>>   
>> +	/* UIO driver should not be loaded in the isolation VM.*/
>> +	if (hv_is_isolation_supported())
>> +		return -ENOTSUPP;
>> +		
>>   	/* Communicating with host has to be via shared memory not hypercall */
>>   	if (!channel->offermsg.monitor_allocated) {
>>   		dev_err(&dev->device, "vmbus channel requires hypercall\n");
>> -- 
>> 2.25.1
>>
> 
> Again you send out known-wrong patches?
> 
> :(
> 
Sorry for noise. Will fix this next version and I think we should make 
sure user space driver to check data from host. This patch will be removed.