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Coverage does not increase #427

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ahpaleus opened this issue May 2, 2023 · 3 comments
Closed

Coverage does not increase #427

ahpaleus opened this issue May 2, 2023 · 3 comments

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@ahpaleus
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ahpaleus commented May 2, 2023

Hey,
Why coverage does not increase where I fuzz a particular function from a node package? How to solve this problem?

Let's say:

const parseHTML = require('node-html-parser')

module.exports.fuzz = function (data) {
    const fuzzerData = data.toString();
    let root = parseHTML.parse(fuzzerData)
}

output:

$ npx jazzer fuzz
INFO: Running with entropic power schedule (0xFF, 100).
INFO: Seed: 319397578
INFO: Loaded 1 modules   (512 inline 8-bit counters): 512 [0x7fd2a8040000, 0x7fd2a8040200), 
INFO: Loaded 1 PC tables (512 PCs): 512 [0x7fd242700000,0x7fd242702000), 
INFO: -max_len is not provided; libFuzzer will not generate inputs larger than 4096 bytes
INFO: A corpus is not provided, starting from an empty corpus
#2      INITED cov: 1 ft: 1 corp: 1/1b exec/s: 0 rss: 117Mb
#32768  pulse  cov: 1 ft: 1 corp: 1/1b lim: 325 exec/s: 16384 rss: 140Mb
#65536  pulse  cov: 1 ft: 1 corp: 1/1b lim: 652 exec/s: 16384 rss: 140Mb
#131072 pulse  cov: 1 ft: 1 corp: 1/1b lim: 1300 exec/s: 16384 rss: 141Mb
#262144 pulse  cov: 1 ft: 1 corp: 1/1b lim: 2611 exec/s: 17476 rss: 141Mb
#524288 pulse  cov: 1 ft: 1 corp: 1/1b lim: 4096 exec/s: 18078 rss: 141Mb
@oetr
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oetr commented May 2, 2023 •
edited

Maybe you didn't instrument the node-html-parser?
I tried with this in my package.json, and it works:

"scripts": {
    "fuzz": "jazzer fuzz -i node-html-parser --sync"
}

Or using npx: npx run fuzz -i node-html-parser

@0xricksanchez
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Hi,

just tested this and it works fine for me when running npm run fuzz instead of npx run fuzz

@ahpaleus
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ahpaleus commented May 2, 2023

Exactly! I missed the -i argument, thanks!

@ahpaleus ahpaleus closed this as completed May 2, 2023
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3 participants
@oetr @0xricksanchez @ahpaleus