Problem:

Error on Linux when attempting to execute a unixODBC command against the AcuXDBC driver:

"xvision.so: cannot restore segment prot after reloc: Permission denied"

The security for all directories and files involved has been set to 777 but the error persists.

Resolution:

This is caused by the kernel security extensions from the Security-Enhanced Linux (SELinux) project, which are enabled by default in some newer Linux distributions. SELinux enables finer-grained control over system security and shared library loading.

To resolve the error the xvision.so library must be registered in the security module using the chcon command:

chcon -t texrel_shlib_t xvision.so