Parse an ELF Header Manually in C

medium3/10

Print an Integer's Bytes in Little-Endian Order List All Sections of an ELF File

Language

Compiler

2.0s Limit 256MB

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Implementation

Implement an ELF header parser in C.

Requirements:

Define Elf64_Ehdr structure matching the ELF specification
Open and read a binary file
Verify the magic bytes (0x7F 'E' 'L' 'F')
Print e_ident bytes (class, data encoding, version, OS/ABI)
Print e_type, e_machine, e_version
Print e_entry, e_phoff, e_shoff, e_flags
Print e_ehsize, e_phentsize, e_phnum
Print e_shentsize, e_shnum, e_shstrndx
Handle both little-endian and big-endian files
Provide clear error messages for non-ELF files

Why This Matters

Every Linux program loader, from the kernel's binfmt_elf to musl's dynamic linker, starts by parsing exactly the fields you are decoding here; readelf -h and objdump -f are thin wrappers around this same struct. Malware analysts hand-parse corrupted or intentionally malformed ELF headers when automated tools like readelf choke on them.

Hints

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Validation Suite

main.c

Workspace 1.0

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