pwn加載題目給定的so

from pwn import *
import sys, os
def change_ld(binary, ld):
    """
    Force to use assigned new ld.so by changing the binary
    """
    if not os.access(ld, os.R_OK): 
        log.failure("Invalid path {} to ld".format(ld))
        return None
 
         
    if not isinstance(binary, ELF):
        if
 
 not os.access(binary, os.R_OK): 
            log.failure("Invalid path {} to binary".format(binary))
            return None
        binary = ELF(binary)
 
 
    for segment in binary.segments:
        if segment.header[‘p_type‘] == ‘PT_INTERP‘:
            size = segment.header[‘p_memsz‘]
            addr =
 
 segment.header[‘p_paddr‘]
            data = segment.data()
            if size <= len(ld):
                log.failure("Failed to change PT_INTERP from {} to {}".format(data, ld))
                return None
            binary.write(addr, ld.ljust(size, ‘\0‘))
            if not os.access(‘/tmp/pwn‘
 
, os.F_OK): os.mkdir(‘/tmp/pwn‘)
            path = ‘/tmp/pwn/{}_debug‘.format(os.path.basename(binary.path))
            if os.access(path, os.F_OK): 
                os.remove(path)
                info("Removing exist file {}".format(path))
            binary.save(path)    
            os.chmod(path, 0b111000000) #rwx------
    success("PT_INTERP has changed from {} to {}. Using temp file {}".format(data, ld, path)) 
    return ELF(path)
#example
elf = change_ld(‘./echo2‘, ‘./ld.so‘)
p = elf.process(env={‘LD_PRELOAD‘:‘./libc.so.6‘})
#後續步驟接著寫

先用strings libc.so.6 | grep GLIBC 查看自己的glibc是否兼容題目給的libc庫

（libc.so.6 是我將題目給的改名的）

註意ld.so 是從安裝的glibc 例如按照我的blog（編譯glibc）的目錄是/usr/glibc223/lib裏的ld2.23.so拷貝出來的並且改了下名 libc.so.6 則是題目給的libc庫改名的

此腳本需要pwn題 ld.so libc.so.6在一個文件夾

寫的好像不太清楚，有問題就問 這破事煩了我兩天才給搞好，真是為難新手

參考

https://bbs.pediy.com/thread-225849.htm

pwn加載題目給定的so