[Bug 1057024] Re: kvm kernel module always loaded, without setting /dev/kvm permissions

[Dmitry Teselkin]

It looks like the bug still exists in 'trusty', qemu-kvm 2.0, however,
it's not clear why.

Aftre installation /dev/kvm have wrong permissions:
---
crw------- 1 root root 10, 232 Jan 20 02:09 /dev/kvm
---

Reinstalling qemu-system-common fixes the problem.


I did a simple research, and here is what I've found:

* The code to fix acl still exists, but was moved to qemu-system-common package.
* There is no /lib/udev/rules.d/70-udev-acl.rules, it looks like ACLs for /dev/kvm are set by /lib/udev/rules.d/70-uaccess.rules, there is a string:
---
SUBSYSTEM=="misc", KERNEL=="kvm", TAG+="uaccess"
---
* A builtin function 'builtin_uaccess' [1] is called to set permissions according to the following string from /lib/udev/rules.d/73-seat-late.rules:
---
TAG=="uaccess", ENV{MAJOR}!="", RUN{builtin}+="uaccess"
---


[1] https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-uaccess.c

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Title:
  kvm kernel module always loaded, without setting /dev/kvm permissions

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