this post was submitted on 19 Jul 2024
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Why the fuck does an antivirus need a kernel driver
Because that's where filesystem access lives? AV wouldn't do very much good if it could only run from userspace.
Because the windows OS is inherently insecure with lots of permission elevation opportunities.
Pretending linux privelege escalation doesn't exist... to fight something that gets root you have to be able to fight at the root level, or the root access malware can simply nuke the av from userland.
Or you could just use kernel namespaces, SELinux, Systemd sandboxing, etc. There is zero need to run in ring 0 for security reasons.
Also, privilege escalation is a lot rarer on Linux than it is on Windows.