![]() When executed, these snippets would write a byte to a shared memory area where the fuzzer can observe and determine which basic blocks had been reached. Basic Block is a group of assembly instructions that are always executed one after the other. Over the past years coverage had proved to be a great feedback mechanism, but collecting it was not simple if one did not own the source code of the target binary.ĪFL originally used compile time instrumentation to insert assembly instructions at the beginning of each basic block. Even if it did not crash the program we can mutate that input to get even more coverage, we call this feedback. In other words the objective is to crash a program, but how can we guide the fuzzer in the right direction?ĪFL added to the objective a notion of code coverage: Any input that reaches an area in the code that was unreachable before is interesting. It does so by generating many inputs to be executed until on of them crashes the target program. ![]() A fuzzer now-days is a automated testing tool to find security bugs.
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