Mirrors/h4cker
2
0
Fork 0
mirror of https://github.com/The-Art-of-Hacking/h4cker synced 2024-11-25 12:20:18 +00:00
Code Issues Projects Releases Packages Wiki Activity

Update strcpy_example.md

Browse source
This commit is contained in:
Omar Santos 2021-02-22 13:16:17 -05:00 committed by GitHub
parent 85b345da09
commit d56b2765ee
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
buffer_overflow_example/strcpy_example.md
View file

@ -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" width="75%" height="75%"> <img src="https://github.com/The-Art-of-Hacking/h4cker/blob/master/buffer_overflow_example/BufferOverFlow.png" width="50%" height="50%">
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.