I've talked about these issues a lot, and in a lot of depth. I recommend watching this talk to help with understanding the scale of the issues and the sorry state of software engineering not just in the Linux kernel but most other major software projects:
youtube.com/watch?v=qrBVXx
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The Linux kernel uses a fundamentally insecure architecture, insecure tools, and has a development culture treating correctness and especially security as an afterthought. It ultimately needs to replaced, but until then, best effort approaches minimizing the harm are important.
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The Linux kernel and other fundamentally insecure software projects designed and implemented without robustness and security as core principles. The Linux kernel is likely getting less secure over time, not more secure, and there is no feasible way to fix a problem of this scale.
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It is not realistic to turn the Linux kernel into something with decent security. Best effort approaches of applying as many security fixes as possible and attempting to address whole bug classes and exploit techniques are useful, but ultimately aren't a solution to the problems.
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Every major release of the Linux kernel makes the problem worse. The complexity and attack surface keep growing at a ridiculously fast pace. The work on hardening moves at a far slower pace than other work making the Linux kernel less secure. Applies to a lot of other projects.
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There's an enormous amount of complexity and attack surface. No one needs a backdoor in a project completely plagued by pervasive vulnerabilities. There are so many vulnerabilities that automated fuzzing is churning out discovered vulnerabilities far faster than they get fixed...
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I have heard about Encro phone which uses android and seems to be very robust in security thanks to locking out everything and no one have so far suceed to breake it, but they are very expensive for normals users. dont know how they did it so secure.
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It's a substantial regression for privacy and security and they're dishonest about many things. By design, they've also gone out of the way to prevent crucial firmware security updates as part of playing semantic games to receive a certification of having no proprietary software.
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