Inside ELF: Exploring the Core of Executable Files

Unlock the Secrets of ELF: The Linux Executable Format

Dive deep into the heart of Linux system programming with this comprehensive course on the ELF (Executable and Linkable Format). Understand the fundamental building block of all executables, object code, shared libraries, and core dumps on Unix-like systems. This course provides a step-by-step, engaging learning experience through video tutorials, covering everything you need to know about ELF.

What You'll Master:

• ELF File Structure: Gain an in-depth understanding of the internal workings of an ELF file. Learn about its organization, including headers, sections, and their roles.
• Compilation Process: Trace the entire compilation process, from pre-processing and compiling to assembling and linking.
• Machine Code & Opcodes: Explore machine code (also known as operation code or opcode) and how it's used to instruct the processor.
• ARM Assembly: Write and execute ARM assembly code using QEMU, learning the syntax of assembly language (labels, instructions, comments, assembler directives).
• Assembler Directives: Become proficient with common assembler directives like .byte, .asciiz, .ascii, .align, .global, .text, and .data.
• QEMU Debugging: View ARM registers using the QEMU monitor interface for effective debugging.
• Symbol Table & Resolution: Understand the symbol table and how symbols are resolved during the linking process.
• Assembler & Linker Roles: Clearly define the roles of the assembler and linker in creating executable programs.
• Relocation: Learn about relocation operations performed by the linker, including section merging and section placement.
• Linker Scripts: Create and utilize linker scripts to control the layout of your ELF files. Learn to write simple linker scripts and apply them during compilation.
• Memory Addresses: Distinguish between runtime addresses and load time addresses.
• Startup Code: Write startup code to manage data copying into RAM, BSS, and stack initialization.
• readelf Command: Master the readelf command to examine the ELF header and its contents.
• Core Dumps: Generate and analyze core dumps to verify the integrity of the ELF header.
• ELF Header Members: Understand the various members of the ELF header and their significance.
• Header Modification: Learn how to change different members of the ELF header.
• gdb & _start(): Understand how gdb uses _start() to determine the entry point of a program.
• C Code to ELF Header: Write C code to generate an ELF header.
• Sections vs. Segments: Differentiate between sections and segments in the context of ELF files.
• Linker & Loader View: Understand the linker and loader's perspective on the ELF file structure.
• readelf Options: Explore various readelf options (e.g., -h, -WS, -Wl, -a) for detailed analysis.
• Section & Program Header: Understand various fields of the section header and program header.
• dumpelf Command: Use the dumpelf command to dump ELF structures in a C-style format.
• C Code for Section Header: Write C code to print specific fields of the ELF section header.
• Debugging with Debug Information: Learn how debug information (generated with the -g flag) is incorporated into ELF files.
• size Command: Use the size command to determine the sizes of text, data, and BSS sections.
• Symbol Table Deep Dive: Gain a deeper understanding of the symbol table and its behavior when using the strip command.
• Minimal ELF Executable: Create a minimal ELF executable with a size under 200KB.

Risk-Free Learning:

This course is backed by a 30-day money-back guarantee. If you're not satisfied, simply request a refund.

Enroll now and take the next step towards becoming an expert in the ELF file format!