Linux
Welcome to c/linux!
Welcome to our thriving Linux community! Whether you're a seasoned Linux enthusiast or just starting your journey, we're excited to have you here. Explore, learn, and collaborate with like-minded individuals who share a passion for open-source software and the endless possibilities it offers. Together, let's dive into the world of Linux and embrace the power of freedom, customization, and innovation. Enjoy your stay and feel free to join the vibrant discussions that await you!
Rules:
-
Stay on topic: Posts and discussions should be related to Linux, open source software, and related technologies.
-
Be respectful: Treat fellow community members with respect and courtesy.
-
Quality over quantity: Share informative and thought-provoking content.
-
No spam or self-promotion: Avoid excessive self-promotion or spamming.
-
No NSFW adult content
-
Follow general lemmy guidelines.
view the rest of the comments
It ought to look like a bunch of □, which is the glyph generally used to indicate that the font has nothing to represent the character.
Specifically you'd expect
U+25A1□ WHITE SQUAREAlso, the answer to your actual question is no. There's definitely no way to block people from using any particular characters at the kernel level.
What you seem to be asking for is a way to absolutely forbid all software from writing certain characters to files, and/or from reading those characters. Aside from requiring that the kernel inspect all data in detail before letting other software have it, which would slow everything way down, it would prevent anyone from reading or writing binary data which happens to contain those sequences of bytes by coincidence. Binary data includes things like the programs which make the system work, so blocking those characters would be terminal
Not necessarily. Turn this around. Let's say I am working at somewhere like a chip foundry with tons of IP. I have no access to encryption tools, but I can easily shift characters to a hex range in bash and send emails.
These characters can use the control glyph, and so do not print or show up in any physical way except in hex.
This technique must be obfuscated at every serious organization from governments to industry.
Encryption exists manually. This isn't the problem you appear to imagine it is
Also, (a) userspace could have some higher-level encoding or encryption or compression that happens without the kernel seeing the non-encoded data, and (b) whatever particular Unicode encoding OP is probably thinking of isn't the only Unicode encoding out there.
That doesn't, strictly-speaking, mean that it's impossible to have kernel-level blocking
you could create some kind of emulated system that inspects everything, but it does mean that you couldn't just inspect data at points where one normally enters the kernel.
The answer that is probably most useful to OP is that if it's a problem for his application, he should validate it in userspace.