Library Disassembly Notes

lib_disassemble.md

Library Disassembly Notes

References

• ldd(1) - print shared object dependencies
• vdso(7) - overview of the virtual ELF dynamic shared object
• libc(7) - overview of standard C libraries on Linux
• ld.so(8) - dynamic linker/loader
• nm(1) - list symbols from object files

Examples

$ gcc -O0 -g -c main.c
$ gcc -o main main.o

$ ldd main
	linux-vdso.so.1 =>  (0x00007ffd25784000)
	libc.so.6 => /lib64/libc.so.6 (0x0000003310400000)
	/lib64/ld-linux-x86-64.so.2 (0x0000003310000000)

$ gdb -batch -ex 'file /lib64/libc.so.6' -ex 'disassemble printf'

main.c

#include <stdio.h>

int main() {
  printf("hello world!\n");
  return 0;
} // main