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Trying not call elfutils functions in ABRT under root


im using elfutils in ABRT program specifically when generating core_backtrace. According to this post, it is not a good idea using elfutils under root. So I have tried moving as much elfutils function calls to non-root process as possible. That means the parent process is forked and in child process there are opened necessary files:

and then UID and GID of child is changed and then I can call elfutils in this function:

Is there any way how I can pass the opened files to elfutils functions? Especially for "/etc/[tid]/mem" which is needed in dwfl_linux_proc_find_elf that is part of Dwfl_Callbacks proc_cb ?

Current problem im solving is 

int dwfl_linux_proc_find_elf function:

where :

s hard-coded opening "/proc/%d/mem" file. Is there any way, how to open this file  "/proc/%d/mem" under root and then pass the opened file to this function in order to avoid running "dwfl_linux_proc_find_elf" function under root?

Thank you

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