Nextepc died in some MT-Fallback

Romeu Medeiros medeiros at medeiros.eng.br
Sun Jul 28 15:21:42 UTC 2019


Hello Sukchan,


Thanks for this!

I will try tomorrow.
Thanks


Romeu Medeiros

Em dom, 28 de jul de 2019 às 12:19, Sukchan Lee <acetcom at gmail.com>
escreveu:

> Hi Romeu,
>
> I've fixed this issue. There is a big bug in ogs_realloc();
>
> The issue link as below,
> OGSLib : https://github.com/open5gs/ogslib/issues/4
> NextEPC: https://github.com/open5gs/nextepc/issues/231
>
> The code is fixed like the following.
>
> https://github.com/open5gs/ogslib/commit/4a6c2e2a4afcc3337b2748d0df645b4b57c0750d
>
> Many thanks!
>
> Best Regards,
>     Sukchan
>
>
> On Wed, Jul 24, 2019 at 10:20 PM Sukchan Lee <acetcom at gmail.com> wrote:
>
>> Ah, one more modification is needed as below.
>>
>> diff --git a/src/mme/s1ap-build.c b/src/mme/s1ap-build.c
>> index a49d117e..cfbedc87 100644
>> --- a/src/mme/s1ap-build.c
>> +++ b/src/mme/s1ap-build.c
>> @@ -531,7 +531,8 @@ int s1ap_build_initial_context_setup_request(
>>          ogs_assert(mme_ue->p_tmsi);
>>          s1ap_uint16_to_OCTET_STRING(mme_ue->csmap->lai.lac, &LAI->lAC);
>>
>> -    } else if (mme_ue->ueRadioCapability.buf &&
>> +    }
>> +    if (mme_ue->ueRadioCapability.buf &&
>>              mme_ue->ueRadioCapability.size) {
>>          /* Set UeRadioCapability if exists */
>>          S1AP_UERadioCapability_t *UERadioCapability = NULL;
>>
>> The above change is also needed to encode more than 9 procotol IE.
>>
>> Thanks!
>>
>>
>>
>> On Wed, Jul 24, 2019 at 10:18 PM Sukchan Lee <acetcom at gmail.com> wrote:
>>
>>> It seems that this is not a problem with the asn1c library. There is a
>>> bug in ogs_calloc()/ogs_free().
>>>
>>> I've changed memory alloc()/free() as below.
>>>
>>> https://github.com/open5gs/nextepc/commit/dba1fcac5c29509a9e662a9fedc37a674a416df3
>>>
>>> And then, the source code is modified like the following.
>>> diff --git a/lib/asn1c/common/asn_internal.h
>>> b/lib/asn1c/common/asn_internal.h
>>> index 77e005f7..d561043b 100644
>>> --- a/lib/asn1c/common/asn_internal.h
>>> +++ b/lib/asn1c/common/asn_internal.h
>>> @@ -23,7 +23,7 @@ extern "C" {
>>>  #define        ASN1C_ENVIRONMENT_VERSION       923     /* Compile-time
>>> version */
>>>  int get_asn1c_environment_version(void);       /* Run-time version */
>>>
>>> -#if 0 /* modified by acetcom */
>>> +#if 1 /* modified by acetcom */
>>>  #define        CALLOC(nmemb, size)     calloc(nmemb, size)
>>>  #define        MALLOC(size)            malloc(size)
>>>  #define        REALLOC(oldptr, size)   realloc(oldptr, size)
>>>
>>> So, s1ap encoder/decoder is executed with system's calloc()/free().
>>>
>>> And then, run the following command.
>>> $ ./test/testcsfb crash-test
>>>
>>> The above test is not crashed.
>>> Of course, if ogs_calloc()/ogs_free() is used, the above test command is
>>> crashed.
>>>
>>> So, I need to analyze what the bug of ogs-memory.c raise this crash.
>>>
>>> Thanks!
>>>
>>>
>>>
>>>
>>> On Mon, Jul 22, 2019 at 12:02 AM Sukchan Lee <acetcom at gmail.com> wrote:
>>>
>>>> Hi Harald,
>>>>
>>>> Of course, I will. But before that I should check the other asn1c
>>>> upstream version. And I need to reproduce test code for asn1c hacker to
>>>> analyze this problem easily.
>>>>
>>>> And then, I will post this issue.
>>>>
>>>> Thanks a lot!
>>>>
>>>> Best Regards
>>>>     Sukchan
>>>>
>>>> 2019. 7. 21. 오후 11:41, Harald Welte <laforge at gnumonks.org> 작성:
>>>>
>>>> > Hi Sukchan,
>>>> >
>>>> >> On Sun, Jul 21, 2019 at 10:59:44PM +0900, Sukchan Lee wrote:
>>>> >> The bad news seems to be a problem with the asn1c library.
>>>> >> More than 9 protocol IE cannot be built from
>>>> InitialContextSetupRequest.
>>>> >
>>>> > I suggest to report this upstream to the asn1c hackers and ask for
>>>> theri help.
>>>> >
>>>> > It may also work using one of the other versions/branches of asn1c
>>>> for comparison.
>>>> > --
>>>> > - Harald Welte <laforge at gnumonks.org>
>>>> http://laforge.gnumonks.org/
>>>> >
>>>> ============================================================================
>>>> > "Privacy in residential applications is a desirable marketing option."
>>>> >                                                  (ETSI EN 300 175-7
>>>> Ch. A6)
>>>>
>>>
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