Understanding ELF Program Interpreter Functionality and Dynamic Linking Mechanisms
By
nytpu
Baker's choice. Dense with flavour, light on filler.
Summary
The article explores the ELF executable format's program interpreter functionality used for dynamic linking, focusing on the PT_INTERP segment that specifies the path to the dynamic linker/loader. The author discusses how this mechanism works, its security implications, and presents a 'cursed' idea about potential misuse of this functionality for creating malicious executables or unconventional program behaviors. The content delves into technical details of ELF format internals, dynamic linking processes, and the implications of hardcoded interpreter paths in executable files.
Key quotes
· 4 pulledThe ELF standard specifies a PT_INTERP type of program segment, which is what makes dynamic linking work.
The PT_INTERP segment contains a single string that specifies a hardcoded path to the dynamic linker/loader.
Immediately I was struck by one of the more cursed and yet simultaneously pedestrian ideas I've had.
For reasons I don't even remember, I was reading about the details of the ELF executable format, and stumbled across the program interpreter functionality used for dynamic linking.
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