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Update strcpy_example.md

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Omar Santos 2021-02-22 13:15:53 -05:00 committed by GitHub
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buffer_overflow_example/strcpy_example.md
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@ -36,7 +36,7 @@ int omarsucks()
``` ```
The following is the stack layout for the code above: The following is the stack layout for the code above:
<img src="https://github.com/The-Art-of-Hacking/h4cker/blob/master/buffer_overflow_example/BufferOverFlow.png"> <img src="https://github.com/The-Art-of-Hacking/h4cker/blob/master/buffer_overflow_example/BufferOverFlow.png" width="75%" height="75%">
The local array `buffer[] in `omarsucks()` has 12 bytes of memory. The `omarsucks()` function uses `strcpy()` to copy the string from `str` to `buffer[]`. The `strcpy()` function does not stop until it sees a zero (a number zero, `'\0'`) in the source string. Since the source string is longer than 12 bytes, `strcpy()` will overwrite some portion of the stack above the buffer. This is called buffer overflow. The local array `buffer[] in `omarsucks()` has 12 bytes of memory. The `omarsucks()` function uses `strcpy()` to copy the string from `str` to `buffer[]`. The `strcpy()` function does not stop until it sees a zero (a number zero, `'\0'`) in the source string. Since the source string is longer than 12 bytes, `strcpy()` will overwrite some portion of the stack above the buffer. This is called buffer overflow.