[zzo38computer]

I think that making a suitable operating system design can help with avoiding some of these problems (and others mentioned elsewhere) (I had mentioned some of my ideas about operating system design before on Hacker News). In combination with this, there is also hardware design to consider (including considerations having to do with the instruction set), and you can also have a package manager with a package repository where whoever manages the package repository will verify them (something that is already done in many systems, although the verification that is already done is often not good enough in some ways); this package repository management is not actually necessary for the security features of the system but makes it more difficult for authors of programs to work around these security features.