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String Buffer Overflow

Question Text​

Why does the buffer overflow occur?

Question Answers​

  • the initial string, declared in main(), does not contain a terminating null byte.

  • the buffer is not large enough to store the copied bytes.

  • memcpy() skips the copying of terminating null bytes.

  • memcpy() copies 4 bytes, whereas the size of the string, including the terminating null byte, is 5.

Feedback​

The string "soso" has length equal to 4, however, 5 bytes are actually used to store it, including the terminating null byte. Even though the buffer declared in fun() is not large enough to store the 5 bytes, the underlying issue is that we copying just 4 bytes, thus skipping the null byte.