GDB cheat-sheet for exploit development

Pranaam to all bhai ji _/\_

Today i am going to share few commands of GDB (GNU Debugger) which comes handy during learning process.
This list is having command commands which ease GDB for beginners.

File to Disable/enable ASLR
 /proc/sys/kernel/randomize_va_space

 download PEDA
 https://github.com/longld/peda
 integrate into gdb
 echo "source ~/peda/peda.py" >> ~/.gdbinit
 -----
| GCC
 -----
=> compile option to
    make stack executable
    -z execstack
    remove stack guard/canaries
    -fno-stack-protector
   
=> Attach program to GDB     
    using program executable - >    gdb program_file
    using running program process ID - > gdb --pid=process_id
   
=> Show list of command classes
    help
    help class_of_command 
=> breakpoint
  set break point
   break function_name
   break memory address
 information regarding breakpoint 
   info breakpoints
   info break breakpoint number

=> Disassemble a function
    disas function_name
=> print function list
    info func
=> Run program with different mode of input
    r data
    r $(python -c 'some python code')
    r < file_having_data
=> print value at spcific memory address or in a register
    p memory_address/register
    different print format
    p/x     Print as integer variable in hex.
    p/d     Print variable as a signed integer.
    p/u     Print variable as a un-signed integer.
    p/o     Print variable as a octal.
    p/c      Print integer as character.
    p/f      Print variable as floating point number.
    p/a      Print as a hex address.
   
 => Examine memory space using x
    x/format
    supported FMT is a repeat count followed by a format letter and a size letter.
      Format letters are
      o(octal)
      x(hex)
      d(decimal)
      u(unsigned decimal)
      t(binary)
      f(float)
      a(address)
      i(instruction)
      c(char)
      s(string)
      and z(hex, zero padded on the left).
      Size letters are b(byte), h(halfword), w(word), g(giant, 8 bytes).
     example: - x/10s $esp/memory_address  or x/10sw $esp/memory_address
          x/10s $esp/memory_address-offset
 => display current information related to CPU registers
    info r
   
 => execute next instruction
    ni
 => step inside a function
    si
   
 => set value of register or memory address
    set $register = hex_value
   
 => print memory address of a function
    p function name
    example: - p system
    
 => search memory for string
    find &system,+9999999,"/bin/sh"  (for old gdb)
    find "/bin/sh"


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