elf-module: Wire up import slots #782
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When enumerating relocations on an in-process ELF it is typically desirable to know the live address of each relocation.
We were doing gum_module_find_export_by_name(NULL, "malloc"), which on UNIX does dlsym(RTLD_DEFAULT, "malloc"). Turns out this may give us the address of gum-tests' import stub, instead of the actual implementation in libc.
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