Similar testcases while fuzzing platform bios

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rust

调研方向

首先,使用七个 BMP 输入以及日志级别 1 和 4,重现示例 5.3“对平台 BIOS 进行 Fuzzing”。比较初始运行和重启后的运行,包括 exec/sec、生成的 corpus 文件、testcase 内容以及为空的 solutions 文件夹;当观察到的 fuzzing 行为和缺失的 solutions 得到解释或修正时,即视为完成。

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描述

The fuzzing process for example 5.3 "Fuzzing a platform BIOS" started successfully:
tsffs_starts

I expected to see the bugs added in example after some time. I left the fuzzer running for a while and the logs are as follows:
logs_2_0

The first thing that confused me is exec/sec: 0.000.
I tried to use different data in corpus, but specifically in this case I used 7 different bmp images. So the second thing that is confusing is that the fuzzer used only two input images (only 2 were created in the corpus) and then nothing happened over time
new_corpus

After that, I stopped the fuzzer and started it again (I did not delete those 2 pictures in the corpus). And in this case exec/sec: is not 0.000
second_time_start_fuzz

next, I repeated the previous iterations but at the logging level 4. I left only 7 test bmp images and run a fuzzer with a logging level 4. As you can see, testcases are the same
logs4_firststart

After that, I restarted the fuzzer (there are 2 additional images in the case from the previous start). In the following logs, you can see that the size of the testcases is different, but the data is the same:
logs4_secondstart

And as a result, it is not possible to find the added bugs, the solutions folder is empty

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