Comment by eru
2 days ago
Well, a kernel bug gets write access to everything. A bug in userland is a bit more constrained in what it can do.
That counts especially for accidental bugs and denial of service. To make a userland bug exploited adversarially not impact the rest of the system requires more hardening of the kernel.
Yeah a userland bug just gets all my passwords, SSH keys, personal secrets and whatever.
Say it with me - there's no practical difference.
You are talking about a single user system.
You can compartmentalise further.
Modern processors even give you these 'rings' to help with the hardware side of that, if you want to.
Yes, these are the standard excuses. But has anyone actually thought about them in the last twenty years, in the context of the way we actually use computers?
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