ELF Symbol table

I’ve recently been doing some hacking (for food). I need to modify some object files (.o) generated by GCC before they’re passed to linker. (Using elfutils)

I thought I was doing everything right, but ld (GNU linker) insisted on crashing with segmentation fault. Finally, eu-elflint told me what was wrong – I was unaware of the ELF requirement that LOCAL symbols must come before GLOBAL symbols in a symtab (symbol table), and that sh_info is the boundary between LOCAL and GLOBAL symbols.

Many thanks to authors of elfutils, especially for their eu-elflint!

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Tags: assembly, dev, GCC, Linux, opensource