From: "Qiu, Michael" <michael.qiu@intel.com>
To: "Xie, Huawei" <huawei.xie@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] vhost: Fix Segmentation fault of NULL address
Date: Thu, 26 Mar 2015 07:58:16 +0000 [thread overview]
Message-ID: <533710CFB86FA344BFBF2D6802E60286D18871@SHSMSX101.ccr.corp.intel.com> (raw)
In-Reply-To: <C37D651A908B024F974696C65296B57B0F3FB912@SHSMSX101.ccr.corp.intel.com>
On 3/26/2015 3:52 PM, Xie, Huawei wrote:
> On 3/26/2015 3:05 PM, Qiu, Michael wrote:
>> Function gpa_to_vva() could return zero, while this will lead
>> a Segmentation fault.
>>
>> This patch is to fix this issue.
>>
>> Signed-off-by: Michael Qiu <michael.qiu@intel.com>
>> ---
>> lib/librte_vhost/vhost_rxtx.c | 3 +++
>> 1 file changed, 3 insertions(+)
>>
>> diff --git a/lib/librte_vhost/vhost_rxtx.c b/lib/librte_vhost/vhost_rxtx.c
>> index 535c7a1..23c8acb 100644
>> --- a/lib/librte_vhost/vhost_rxtx.c
>> +++ b/lib/librte_vhost/vhost_rxtx.c
>> @@ -587,6 +587,9 @@ rte_vhost_dequeue_burst(struct virtio_net *dev, uint16_t queue_id,
>>
>> /* Buffer address translation. */
>> vb_addr = gpa_to_vva(dev, desc->addr);
>> + if (!vb_addr)
>> + return entry_success;
>> +
> Firstly we should add check for all gpa_to_vva translation, and do
> reporting and cleanup on error. We should avoid the case that some buggy
> or malicious guest virtio driver gives us an invalid GPA(for example,
> GPA for some MMIO space) and crash our vhost process.
Yes, agree, I will do this for next version.
> As we discuss, you meet segfault here, but our virtio PMD shouldn't give
> us the GPA that has no translation, so we should root cause first and
Yes, root cause is very important, but it will spend lots time, and I
think we could be possible to apply this first(All check version).
Thanks,
Michael
> fix the problem, and then submit the patch checking all gpa_to_vva
> translation.
>
> -Huawei
>> /* Prefetch buffer address. */
>> rte_prefetch0((void *)(uintptr_t)vb_addr);
>>
>
next prev parent reply other threads:[~2015-03-26 8:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-26 7:04 Michael Qiu
2015-03-26 7:52 ` Xie, Huawei
2015-03-26 7:58 ` Qiu, Michael [this message]
2015-03-26 8:29 ` Linhaifeng
2015-03-27 8:45 ` Qiu, Michael
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