[erlang-patches] SNMP/VACM: bugfix for vacmViewTreeFamilyMask

Fredrik <>
Mon Jun 10 11:14:52 CEST 2013

On 06/10/2013 11:07 AM, Stefan Zegenhagen wrote:
> Dear all,
> it's almost a year since I sent the patch attached to this e-mail, and I
> just found out that I have not yet gotten a response to it.
> I would consider this patch important because it fixes an issue with the
> interpretation of data that might be critical for SNMPv3 operation. I
> confirmed at that time that erlangs interpretation of
> vacmViewTreeFamilyMask is indeed not interoperable with other SNMP
> stacks.
> Kind regards,
>>>> the implementation of SNMP-VIEW-BASED-ACM.mib assumes that the input for
>>>> vacmViewTreeFamilyMask is an OID consisting of 1's and 0's only to form
>>>> the mask. However, the MIB states that the input should be a bitstring.
>>>> The OID representation of the mask is useful in the code as it speeds up
>>>> time-critical code paths when checking access permissions for EACH SNMP
>>>> access. Reading/writing the view mask objects is less time-critical.
>>>> Therefore, to fix the issue, convert between OID representation and
>>>> bitstring when the vacmViewTreeFamilyMask objects are accessed. This is
>>>> done by the patch attached to this e-mail.
>> I'm very sorry for the troubles that I am causing but it seems that the
>> previous version of the patch did more than it should: the OID-bitstring
>> conversion was also applied to other tables in the same MIB on
>> get/get-next requests.
>> The version of the patch that is attached to this e-mail restricts the
>> OID-bitstring conversion to vacmViewTreeFamilyMask alone.
> _______________________________________________
> erlang-patches mailing list
> http://erlang.org/mailman/listinfo/erlang-patches
Hello Stefan,
We would prefer to get all patches according to 
We don't prefer mailpatches for bigger issues because they become more 
time-consuming for us.
So set up your github account (if you don't already have one), follow 
the instructions and we will gladly review your patch.


BR Fredrik Gustafsson
Erlang OTP Team

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