Bug 1333159

Hello,

Simpler way to reproduce:

#prepare
rmmod kvm kvm_intel
yum remove  qemu-kvm
modprobe kvm_intel
# owner of /dev/kvm should be root. root
# Test
udevadm trigger 
yum install -y qemu-kvm
# notably install must complete with 3s from trigger fpr bug to occur
# check /dev/kvm owner it should be root.kvm if not you hit the bug

If trigger is omitted above the permissions will change as they should

olimpb

Fix included in qemu-kvm-1.5.3-114.el7

I got the same result between fixed and unfixed qemu-kvm. so I am not sure if this bug is fixed.  Could you help me take a look at these steps?  If it is wrong. please correct it. 

steps:

1.#rmmod kvm kvm_intel

２.#rpm -e qemu-kvm-tools-1.5.3-105.el7.x86_64 qemu-kvm-common-1.5.3-105.el7.x86_64 qemu-kvm-debuginfo-1.5.3-105.el7.x86_64 qemu-img-1.5.3-105.el7.x86_64 qemu-kvm-1.5.3-105.el7.x86_64

3.# modprobe kvm_intel

4.# ll /dev/kvm
crw------- 1 root root 10, 232 Sep  5 15:20 /dev/kvm

5.#rpm -ivh qemu*(qemu-kvm-1.5.3-105......)

6.# ll /dev/kvm
crw-rw-rw- 1 root kvm 10, 232 Sep  5 15:20 /dev/kvm

The fixed version(qemu-kvm-1.5.3-121) and unfixed version(qemu-kvm-1.5.3-105.el7) got the same result as above.

cancel the needinfo in comment 9 as can reproduce it now.

-------------------------reproduce---------------------
Test version:
qemu-kvm-1.5.3-113.el7.x86_64

Test steps:
1. unload kvm module, uninstall qemu-kvm
  # rmmod kvm-intel kvm
  # rpm -qa | grep qemu-kvm
    qemu-kvm-common-1.5.3-113.el7.x86_64
    qemu-kvm-1.5.3-113.el7.x86_64
  # yum remove -y qemu-kvm-common-1.5.3-113.el7.x86_64 qemu-kvm-1.5.3-113.el7.x86_64

2. load kvm module
  # modprobe kvm_intel
  # lsmod | grep kvm
   kvm_intel             170125  0 
   kvm                   543643  1 kvm_intel
   irqbypass              13503  2 kvm,vfio_pci

3. check owner of /dev/kvm, it is "root.root", right result.
  # ll /dev/kvm
    crw-------. 1 root root 10, 232 Sep 14 04:26 /dev/kvm

4. Install qemu-kvm while doing "udevadm trigger"
  # udevadm trigger; yum install -y ./qemu-*
  # rpm -qa | grep qemu-kvm
    qemu-kvm-common-1.5.3-113.el7.x86_64
    qemu-kvm-1.5.3-113.el7.x86_64

5. check owner of /dev/kvm, it is "root.root", so hit this issue.
  # ll /dev/kvm
   crw-------. 1 root root 10, 232 Sep 14 04:28 /dev/kvm

6. uninstall qemu-kvm, then install qemu-kvm without "udevadm trigger"
  # yum remove -y qemu-kvm-common-1.5.3-113.el7.x86_64 qemu-kvm-1.5.3-113.el7.x86_64
  # yum install -y ./qemu-*

7. check owner of /dev/kvm, it is "root.kvm"
  # ll /dev/kvm
crw-rw-rw-. 1 root kvm 10, 232 Sep 14 04:30 /dev/kvm

reproduce this bug successfully according the result of step 5.

-------------------------verification---------------------
Test version:
qemu-kvm-1.5.3-124.el7.x86_64

Test steps:
same steps with above.
1. unload kvm module, uninstall qemu-kvm
2. load kvm module
3. check owner of /dev/kvm, it is "root.root", right result.
4. install qemu-kvm while doing "udevadm trigger".
  # udevadm trigger; yum install -y ./* 
   (qemu-kvm-1.5.3-124.el7.x86_64)

5. check owner of /dev/kvm, it is "root.kvm".
  # ll /dev/kvm
   crw-rw-rw-. 1 root kvm 10, 232 Sep 14 04:32 /dev/kvm

Move to VERIFIED according to the test result above.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2016-2585.html