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From: "Burakov, Anatoly" <anatoly.burakov@intel.com>
To: Yasufumi Ogawa <yasufum.o@gmail.com>, david.marchand@redhat.com
Cc: dev@dpdk.org, stable@dpdk.org,
	Yasufumi Ogawa <ogawa.yasufumi@lab.ntt.co.jp>
Subject: Re: [dpdk-stable] [PATCH v3 1/1] fbarray: get fbarrays from containerized secondary
Date: Mon, 22 Jul 2019 10:25:39 +0100
Message-ID: <d3725e4c-0afe-2d7a-7074-84d555c8d04f@intel.com> (raw)
In-Reply-To: <99d2853d-f6f9-59f2-f853-0f9222e8cb5d@gmail.com>

On 12-Jul-19 3:22 AM, Yasufumi Ogawa wrote:
> On 2019/07/11 22:14, Burakov, Anatoly wrote:
>> On 11-Jul-19 12:57 PM, Yasufumi Ogawa wrote:
>>> On 2019/07/11 19:53, Burakov, Anatoly wrote:
>>>> On 11-Jul-19 11:31 AM, yasufum.o@gmail.com wrote:
>>>>> From: Yasufumi Ogawa <ogawa.yasufumi@lab.ntt.co.jp>
>>>>>
>>>> <...>
>>>>
>>>>> +    if (getpid() == 1) {
>>>>> +        FILE *hn_fp;
>>>>> +        hn_fp = fopen("/etc/hostname", "r");
>>>>> +        if (hn_fp == NULL) {
>>>>> +            RTE_LOG(ERR, EAL,
>>>>> +                "Cannot open '/etc/hostname' for secondary\n");
>>>>> +            return -1;
>>>>> +        }
>>>>> +
>>>>> +        /* with docker, /etc/hostname just has one entry of 
>>>>> hostname */
>>>>> +        if (fscanf(hn_fp, "%s", proc_id) == EOF) {
>>>>
>>>> Apologies for not pointing this out earlier, but do i understand 
>>>> correctly that there's no bounds checking here, and fscanf() will 
>>>> write however many bytes it wants?
>>> I understand "%s" is not appropriate. hostname is 12 bytes char and I 
>>> thought proc_id[16] is enough, but it is unsafe. In addition, 
>>> hostname can be defined by user with docker's option, so it should be 
>>> enough for user defined name.
>>>
>>> How do you think expecting max 32 chars of hostname and set boundary 
>>> "%32s" as following?
>>>
>>>      proc_id[33];  /* define proc id from hostname less than 33 
>>> bytes. */
>>>      ...
>>>      if (fscanf(hn_fp, "%32s", proc_id) == EOF) {
>>>
>>
>> As long as it takes NULL-termination into account as well, it should 
>> be OK. I can't recall off the top of my head if %32s includes NULL 
>> terminator (probably not?).
> Do you agree if initialize with NULL chars to ensure proc_id is 
> NULL-terminated? As tested on my environment, "%Ns" sets next of Nth 
> char as NULL, but it seems more reliable.
>      proc_id[33] = { 0 };
> 
> Yasufumi
> 

Yes, that should be OK.

-- 
Thanks,
Anatoly

  parent reply index

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-16  1:59 [dpdk-stable] [PATCH] " ogawa.yasufumi
2019-04-16  3:43 ` [dpdk-stable] [PATCH v2 0/1] Get " ogawa.yasufumi
2019-04-16  3:43   ` [dpdk-stable] [PATCH v2 1/1] fbarray: get " ogawa.yasufumi
2019-07-04 20:17     ` [dpdk-stable] [dpdk-dev] " Thomas Monjalon
2019-07-05  8:53     ` [dpdk-stable] " Burakov, Anatoly
2019-07-09 10:22       ` [dpdk-stable] [dpdk-dev] " Yasufumi Ogawa
2019-07-09 10:24         ` Burakov, Anatoly
2019-07-09 10:26           ` Burakov, Anatoly
2019-07-11  9:37             ` Yasufumi Ogawa
2019-07-11  9:43               ` Burakov, Anatoly
2019-07-11 10:31 ` [dpdk-stable] [PATCH v3 0/1] " yasufum.o
2019-07-11 10:31   ` [dpdk-stable] [PATCH v3 1/1] " yasufum.o
2019-07-11 10:53     ` Burakov, Anatoly
2019-07-11 11:57       ` Yasufumi Ogawa
2019-07-11 13:14         ` Burakov, Anatoly
2019-07-12  2:22           ` Yasufumi Ogawa
2019-07-22  1:06             ` Ogawa Yasufumi
2019-07-22  9:33               ` Burakov, Anatoly
2019-07-22  9:25             ` Burakov, Anatoly [this message]
2019-07-24  8:20   ` [dpdk-stable] [PATCH v4 0/1] " yasufum.o
2019-07-24  8:20     ` [dpdk-stable] [PATCH v4 1/1] " yasufum.o
2019-07-24  9:59       ` Burakov, Anatoly
2019-07-30  8:16         ` Thomas Monjalon
2019-07-30  9:18           ` Burakov, Anatoly
2019-07-31  5:48             ` Yasufumi Ogawa
2019-10-11  9:36       ` David Marchand
2019-10-25 15:36         ` David Marchand
2019-10-25 19:54           ` Yasufumi Ogawa
2019-10-26 16:15             ` David Marchand
2019-10-26 18:11               ` Yasufumi Ogawa
2019-10-28  8:07     ` [dpdk-stable] [PATCH v5 0/1] fbarray: fix duplicated fbarray file in secondary yasufum.o
2019-10-28  8:07       ` [dpdk-stable] [PATCH v5 1/1] " yasufum.o
2019-10-29 12:03         ` [dpdk-stable] [dpdk-dev] " Ananyev, Konstantin
2019-10-30 13:42           ` Yasufumi Ogawa
2019-10-30 19:00             ` Ananyev, Konstantin
2019-10-31 10:03               ` Yasufumi Ogawa
2019-10-31 10:32                 ` Ananyev, Konstantin
2019-11-01  9:04     ` [dpdk-stable] [PATCH v6 0/1] " yasufum.o
2019-11-01  9:04       ` [dpdk-stable] [PATCH v6 1/1] " yasufum.o
2019-11-01 12:01         ` Ananyev, Konstantin
2019-11-04 10:20         ` Burakov, Anatoly
2019-11-05 10:13           ` David Marchand
2019-11-05 11:31             ` Burakov, Anatoly
2019-11-05 11:41               ` Ananyev, Konstantin
2019-11-06 10:37                 ` Burakov, Anatoly
2019-11-08  3:19                   ` Yasufumi Ogawa
2019-11-13 21:43     ` [dpdk-stable] [PATCH v7 0/1] " yasufum.o
2019-11-13 21:43       ` [dpdk-stable] [PATCH v7 1/1] " yasufum.o
2019-11-14 10:01         ` Burakov, Anatoly
2019-11-14 11:42           ` Yasufumi Ogawa
2019-11-14 12:27             ` David Marchand
2019-11-26 19:40               ` Yasufumi Ogawa
2019-11-27 10:26                 ` Burakov, Anatoly
2019-11-14 12:55         ` David Marchand
2019-11-14 17:32         ` Ananyev, Konstantin

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