What is "Access Overrun"?

delphi package - automated exception handling

What is "Access Overrun"?

Postby rodc » Fri Dec 16, 2016 6:13 pm

The option "instantly crash on buffer ... overrun" on madexcept shouldn't catch this type of error? Or I didn't understood what is this option?

Code: Select all
int test[2];
test[3] = 20;  // isn't it an access overrun?
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Re: What is "Access Overrun"?

Postby madshi » Wed Dec 21, 2016 12:04 pm

It depends. If the array is *allocated* then such a type of error should be detected. However, it also depends on allocation alignment. Some code requires code to be aligned in a certain way. Because of that it's sometimes possible that I can't detect if you just overrun a buffer by a tiny amount (say just 1 byte or maybe 2-3 bytes), but it also depends on the exact size of the buffer.

Your code seems to use a local variable. Such variables are not allocated, they're instead placed on the stack by the compiler, which makes it technically impossible for me to detect an overrun.
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