September 2017
Beginner to intermediate
290 pages
6h 58m
English
Content preview from Mastering Assembly Programming
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Applying the patch
In the Preparing for the patch subsection of this chapter, we have already located the place where the patch should be applied in the hex editor, which is at the file offset 0x4198. The application of the patch is rather simple --we copy the bytes from the patch.bin file into the executable at the aforementioned location and get the following:
Now save the file and we are done. The executable has been patched and would use fgets() instead of gets() from now on. We may check this by running the executable and feeding a very long string instead of a name:
As we see, such input no longer causes any error as with fgets() at ...
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