Start

[*] '/mnt/d/ctf/pwnable/start'
    Arch:       i386-32-little
    RELRO:      No RELRO
    Stack:      No canary found
    NX:         NX disabled
    PIE:        No PIE (0x8048000)
    Stripped:   No

一道32位的题目，什么保护都没有开启，直接放入ida中进行分析

.text:08048060 ; int start()
.text:08048060                 public _start
.text:08048060 _start          proc near               ; DATA XREF: LOAD:08048018↑o
.text:08048060                 push    esp
.text:08048061                 push    offset _exit
.text:08048066                 xor     eax, eax
.text:08048068                 xor     ebx, ebx
.text:0804806A                 xor     ecx, ecx
.text:0804806C                 xor     edx, edx
.text:0804806E                 push    ':FTC'
.text:08048073                 push    ' eht'
.text:08048078                 push    ' tra'
.text:0804807D                 push    'ts s'
.text:08048082                 push    2774654Ch
.text:08048087                 mov     ecx, esp        ; addr
.text:08048089                 mov     dl, 14h         ; len
.text:0804808B                 mov     bl, 1           ; fd
.text:0804808D                 mov     al, 4
.text:0804808F                 int     80h             ; LINUX - sys_write
.text:08048091                 xor     ebx, ebx
.text:08048093                 mov     dl, 3Ch ; '<'
.text:08048095                 mov     al, 3
.text:08048097                 int     80h             ; LINUX -
.text:08048099                 add     esp, 14h
.text:0804809C                 retn