로그인

검색

C/C++
2013.07.28 02:42

Buffer Overrun

MoA
조회 수 3520 추천 수 0 댓글 0
?

단축키

Prev이전 문서

Next다음 문서

크게 작게 위로 아래로 게시글 수정 내역 댓글로 가기 인쇄
?

단축키

Prev이전 문서

Next다음 문서

크게 작게 위로 아래로 게시글 수정 내역 댓글로 가기 인쇄
How does one patch or prevent a BufferOverRun??

From the start - don't stuff more bytes into a buffer than it can hold.

More specifically (this applies to C/C++; a lot of these problems don't occur in other languages):

  • If writing code in C++, use the string class rather than char[] for strings whenever performance isn't a priority.
  • Never use gets() -- always use fgets()
  • Never use sprintf(), use snprintf() instead
  • Never use strcpy(), use strncpy() instead
  • Never use strcat(), use strncat() instead
  • Never use printf (foo) to print a raw string; always use printf ("%s", foo). Especially important if foo is a string generated by a user. One class of attacks is to embed nasty formatting controls (like %n) in a string, trying to cause a buffer overflow. (See FormatStringVulnerability?)
  • If you have to use char[] rather than string, keep track of your buffer lengths.
  • Never assume a 4K or other size buffer is "long enough"... chances are it won't be.
  • Use dynamic char buffers, and DoubleAfterFull to maintain good performance.

The best way to avoid buffer overruns and the related list overruns and list jams is to make a religion of testing your boundary conditions, testing your boundary assumptions and, most important, any programmer whose code allows them should be subjected to the most severe ridicule and humiliation the team's culture will allow. Dunce caps are easy to make and very effective.


위키링크 추가 http://en.wikipedia.org/wiki/Buffer_overflow

?

  1. Programming 게시판 관련

    Date2014.11.01 CategoryTool/etc ByMoA Views15458
    read more
  2. Essential C 링크

    Date2011.08.31 CategoryC/C++ By너울 Views3489
    Read More
  3. 고수가 절대 알려주지 않는 C/C++ 팁

    Date2011.09.23 CategoryC/C++ By너울 Views2972
    Read More
  4. C++의 새로운 표준, C++0x에서 C++11으로

    Date2011.10.15 CategoryC/C++ By너울 Views3081
    Read More
  5. printf Type Field Characters

    Date2012.02.23 CategoryC/C++ By너울 Views3483
    Read More
  6. 코드 실행 시간 계산

    Date2012.08.02 CategoryC/C++ ByNaya Views3126
    Read More
  7. C Runtime 환경의 메모리 릭 잡는 방법 (Memory leak)

    Date2012.08.02 CategoryC/C++ ByNaya Views2798
    Read More
  8. 코드 실행 시간 계산

    Date2012.09.27 CategoryC/C++ ByNaya Views2781
    Read More
  9. C++에서 base64로 인코딩

    Date2012.11.15 CategoryC/C++ ByNaya Views3535
    Read More
  10. extern "C" 에 관하여

    Date2013.07.28 CategoryC/C++ ByMoA Views3323
    Read More
  11. 비트연산자

    Date2013.07.28 CategoryC/C++ ByMoA Views3087
    Read More
  12. C언어의 변수 float와 double - Float Point 처리

    Date2013.07.28 CategoryC/C++ ByMoA Views2594
    Read More
  13. C 언어의 문자형 변수 char - 8비트 정수형 변수

    Date2013.07.28 CategoryC/C++ ByMoA Views4937
    Read More
  14. Binary 데이터 저장 by Google

    Date2013.07.28 CategoryC/C++ ByMoA Views3119
    Read More
  15. fwrite(), fread()

    Date2013.07.28 CategoryC/C++ ByMoA Views3223
    Read More
  16. Google의 C++ 라이브러리

    Date2013.07.28 CategoryC/C++ ByMoA Views3000
    Read More
  17. Buffer Overrun

    Date2013.07.28 CategoryC/C++ ByMoA Views3520
    Read More
  18. Simplified Logger Class

    Date2013.07.28 CategoryC/C++ ByMoA Views3329
    Read More
  19. C, C++ 에서의 불(bool, boolean) 타입의 동작

    Date2013.07.28 CategoryC/C++ ByMoA Views3194
    Read More
  20. ofstream ifstream

    Date2013.07.28 CategoryC/C++ ByMoA Views3532
    Read More
  21. 파일 입출력

    Date2013.07.28 CategoryC/C++ ByMoA Views2560
    Read More
Board Pagination Prev 1 2 Next
/ 2