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Add project for OpenWRT relayd CVE-2020-11752 #16

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Uses modified source code of OpenWRT relayd (GPLv2). Like #15 this needs some annotation of that.

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Please add into the github actions building the docker, similar to other projects.


> Note: Fuzzing has some degree of non-determinism, so when you run
yourself you may not get exactly this file. This is expected; your
output should still trigger the Oniguruma regex bug.
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Remove note (copy-paste left-over).

@@ -0,0 +1,47 @@
# OpenWRT mdns CVE-2020-11752
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Should header say "relayd"? Also want to check that the CVE number isn't a left-over from copy-paste.

mayhem run mayhem/relayd
```

and watch Mayhem replicate the bugs! These bugs take seconds!
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Please add a hyperlink to ForAllSecure on word Mayhem. Helps pagerank :)

# OpenWRT mdns CVE-2020-11752

Three out-of-bounds access issues were found in OpenWRT's relayd. They were reported to the OpenWRT security address on April 9 2020, and a fix ([1](https://git.openwrt.org/?p=project/relayd.git;a=commit;h=796da66abd074037f3b48475772d65874cc6de54), [2](https://git.openwrt.org/?p=project/relayd.git;a=commit;h=f4d759be54ceb37714e9a6ca320d5b50c95e9ce9)) was released soon after.

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nice! Couple of requests:

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