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4.0 4.0 0.0 545 KB

2020 WCTF Challenge authored by Cykor

Python 43.50% C++ 48.97% Makefile 5.23% Shell 1.75% Dockerfile 0.56%

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executor로 write수행 안됨

p.sendline('write("ex", {}, 0)'.format(
        encode_string(
            'createfile("flagflag", 32, 3)\\nwrite("flagflag",read("flag.txt",0,32),0)'
        )))

p.sendline('execute("ex")')

파일을 쓰는 스크립트를 executor로 실행하면, 파일이 안써짐

make test
cd test
python3 ex-1.py

로 테스트 가능

[Frontend] string에서 non-alphanumeric char 지원

TODO

[Bug] FileFile의 return 값이 정상적이지 않음

BLPfs/backend/fs.cpp

Lines 272 to 278 in c90e106

 if (!memcpy(out, data, len)) { 

 res = len; 

 } 

 end: 

 Rewind(); 

 return res;

length로 되는 것이 좋을듯요.
지금은 파일 읽기가 성공할 경우 -1을 리턴하게 됩니다.

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	if (!memcpy(out, data, len)) {
	res = len;
	}

	end:
	Rewind();
	return res;