TL DR; ELF files

Program Headers [Phdr]

Describes how data is organized (mapped) in memory

- permissions (RWX), addresses, sizes

- segments

- used by the loader

 $ readelf --segments poc

Section Headers [Shdr]

Describes how data is organized on disk

- .text, .data, .bss, .comment ..

- offset on disk, sizes on disk

- used by the linker and not needed for execution

$ readelf --sections poc

TL DR; ELF files

0x400000

0x401000

0x402000

On file system

On file system

 $ ./poc

Virtual Memory (RAM)

 GDB  : $ vmmap and $ info file and $ xinfo <addr>

Virtual Memory (RAM)