_ASN_STACK_OVERFLOW_CHECK fails with ASAN

[AEberleMW]

We are currently running libiec61850 on a ubunu 24.04 x86_64 with kernel 6.11.0, compiled with gcc using ASAN. Our client application is fetching all objects from a server (IedConnection_getLogicalNodeVariables) and then tries to read all data points using IedConnection_readObject.

After successfully reading a bunch of data, IedConnection_readObject returns with IED_ERROR_MALFORMED_MESSAGE resulting from _ASN_STACK_OVERFLOW_CHECK returning -1. While debugging this, I found out, that the OS is changing the stack memory area after certain calls and so the address of asn_codec_ctx_t is very different (> 1 MB) from the address of the pointer. It follows that _ASN_STACK_OVERFLOW_CHECK is not working correctly.

Since there is no possibility to disable _ASN_STACK_OVERFLOW_CHECK without changing the code, I would suggest to make it optional via compile flag or config option. There is already a PR in the orginal asn1c project, which seems to solve the problem: vlm/asn1c#476

Thanks,
Marco