From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: Bruce Richardson <bruce.richardson@intel.com>
Cc: "Piasecki, JacekX" <jacekx.piasecki@intel.com>,
"Jastrzebski, MichalX K" <michalx.k.jastrzebski@intel.com>,
"yliu@fridaylinux.org" <yliu@fridaylinux.org>,
"dev@dpdk.org" <dev@dpdk.org>,
"Jain, Deepak K" <deepak.k.jain@intel.com>,
"Liu, Changpeng" <changpeng.liu@intel.com>
Subject: Re: [dpdk-dev] [PATCH] examples/vhost_scsi: fix buffer not terminated
Date: Thu, 5 Oct 2017 15:02:15 +0200 [thread overview]
Message-ID: <258f3999-b425-965a-287d-345e1f5d529c@redhat.com> (raw)
In-Reply-To: <20171005130112.GB12160@bricha3-MOBL3.ger.corp.intel.com>
On 10/05/2017 03:01 PM, Bruce Richardson wrote:
> On Thu, Oct 05, 2017 at 02:42:24PM +0200, Maxime Coquelin wrote:
>>
>>
>> On 10/05/2017 02:35 PM, Piasecki, JacekX wrote:
>>> -----Original Message-----
>>> From: Maxime Coquelin [mailto:maxime.coquelin@redhat.com]
>>> Sent: Monday, 2 October, 2017 17:07
>>> To: Jastrzebski, MichalX K <michalx.k.jastrzebski@intel.com>; yliu@fridaylinux.org
>>> Cc: dev@dpdk.org; Jain, Deepak K <deepak.k.jain@intel.com>; Piasecki, JacekX <jacekx.piasecki@intel.com>; Liu, Changpeng <changpeng.liu@intel.com>; stable@dpdk.org
>>> Subject: Re: [dpdk-dev] [PATCH] examples/vhost_scsi: fix buffer not terminated
>>>
>>>
>>>
>>> On 10/02/2017 03:50 PM, Jastrzebski, MichalX K wrote:
>>>>> -----Original Message-----
>>>>> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Michal
>>>>> Jastrzebski
>>>>> Sent: Friday, September 22, 2017 3:08 PM
>>>>> To: yliu@fridaylinux.org; maxime.coquelin@redhat.com
>>>>> Cc: dev@dpdk.org; Jain, Deepak K <deepak.k.jain@intel.com>; Piasecki,
>>>>> JacekX <jacekx.piasecki@intel.com>; Liu, Changpeng
>>>>> <changpeng.liu@intel.com>; stable@dpdk.org
>>>>> Subject: [dpdk-dev] [PATCH] examples/vhost_scsi: fix buffer not
>>>>> terminated
>>>>>
>>>>> From: Jacek Piasecki <jacekx.piasecki@intel.com>
>>>>>
>>>>> Fix size of buffer in strcpy. There was possible to get not
>>>>> terminated string after copy operation.
>>>>>
>>>>> Coverity issue: 158631
>>>>> Fixes: db75c7af19bb ("examples/vhost_scsi: introduce a new sample
>>>>> app")
>>>>> Cc: changpeng.liu@intel.com
>>>>> Cc: stable@dpdk.org
>>>>>
>>>>> Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
>>>>> ---
>>>>> examples/vhost_scsi/scsi.c | 3 ++-
>>>>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>>>>
>>>>> diff --git a/examples/vhost_scsi/scsi.c b/examples/vhost_scsi/scsi.c
>>>>> index 54d3104..de9639a 100644
>>>>> --- a/examples/vhost_scsi/scsi.c
>>>>> +++ b/examples/vhost_scsi/scsi.c
>>>>> @@ -307,7 +307,8 @@
>>>>> strncpy((char *)inqdata->t10_vendor_id, "INTEL", 8);
>>>>>
>>>>> /* PRODUCT IDENTIFICATION */
>>>>> - strncpy((char *)inqdata->product_id, bdev->product_name,
>>>>> 16);
>>>>> + strncpy((char *)inqdata->product_id, bdev->product_name,
>>>>> + ARRAY_SIZE(inqdata->product_id) - 1);
>>>
>>> Does it assume that product_id is memzero'ed before?
>>> IIUC strncpy manpage, it wouldn't protect against non-null terminated strings if it is not the case:
>>>
>>> Yes, I assumed that this area is zeroed before strncpy. Earlier there is a casting from *task to *inqdata (*task is zmalloced).
>> Ok. I think the assumption is dangerous.
>>
>>> To be sure that the destination area is clear I propose to add:
>>> memset(inqdata->product_id, 0, ARRAY_SIZE(inqdata->product_id));
>>> before strncpy. Would that be OK?
>>
>> Or call strncpy with ARRAY_SIZE(inqdata->product_id) as max length,
>> and then do
>> inqdata->product_id[ARRAY_SIZE(inqdata->product_id) - 1] = '\0';
>>
>> Regards,
>> Maxime
>>>
> Or use snprintf instead of strncpy, as we do in many places in DPDK.
> Still only one line of code, with nice null-termination, and truncation
> semantics.
+1
> /Bruce
>
next prev parent reply other threads:[~2017-10-05 13:02 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-22 13:07 Michal Jastrzebski
2017-10-02 13:50 ` Jastrzebski, MichalX K
2017-10-02 15:07 ` Maxime Coquelin
2017-10-05 12:35 ` Piasecki, JacekX
2017-10-05 12:42 ` Maxime Coquelin
2017-10-05 13:01 ` Bruce Richardson
2017-10-05 13:02 ` Maxime Coquelin [this message]
2017-10-12 6:44 ` [dpdk-dev] [PATCH v2] " Jacek Piasecki
2017-10-12 11:09 ` Maxime Coquelin
2017-10-12 11:34 ` [dpdk-dev] [PATCH v3] " Jacek Piasecki
2017-10-13 7:12 ` Maxime Coquelin
2017-10-17 13:26 ` Yuanhan Liu
2017-10-24 16:22 ` [dpdk-dev] [dpdk-stable] " Thomas Monjalon
2017-10-25 10:07 ` [dpdk-dev] [PATCH v4] " Jacek Piasecki
2017-10-25 10:18 ` Thomas Monjalon
2017-09-22 13:08 [dpdk-dev] [PATCH] " Michal Jastrzebski
2017-09-22 13:23 ` Jastrzebski, MichalX K
2017-09-22 13:09 Michal Jastrzebski
2017-10-02 13:53 ` Jastrzebski, MichalX K
2017-10-11 13:45 ` Jastrzebski, MichalX K
2018-05-14 19:08 ` Thomas Monjalon
2018-05-15 5:59 ` Pattan, Reshma
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