Nextepc died in some MT-Fallback

Sukchan Lee acetcom at gmail.com
Wed Jul 24 13:20:54 UTC 2019


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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