Article 4ZBVB What is upstream /downstream with ref to kernel

What is upstream /downstream with ref to kernel

by
baggister
from LinuxQuestions.org on (#4ZBVB)
Read here ...
https://www.zdnet.com/article/google...roid-security/

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Even when these downstream customizations are meant to add security to a device, they also introduce security bugs
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And at the end ...

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... device-specific kernel modifications would be better off either being upstreamed or ...}}}

Can anyone please explain what the above mean?latest?d=yIl2AUoC8zA latest?i=RNaUDeEZYWI:3AUE14wR--c:F7zBnMy latest?i=RNaUDeEZYWI:3AUE14wR--c:V_sGLiP latest?d=qj6IDK7rITs latest?i=RNaUDeEZYWI:3AUE14wR--c:gIN9vFwRNaUDeEZYWI
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