** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Disco)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Eoan)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1860657
Title:
Prevent arm64 guest from accessing host debug registers
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Bionic:
Fix Committed
Status in linux source package in Disco:
Fix Committed
Status in linux source package in Eoan:
Fix Committed
Status in linux source package in Focal:
Fix Committed
Bug description:
[Impact]
Guests could access host debug/PMU registers. This could happen very briefly
before they are first preempted.
This only affects arm64 CPUs that support virtualization.
[Regression potential]
This could break virtualization or guest access to PMU registers.
[Test case]
A guest has been run with a host with the patched kernel. perf top has been
run on the guest. Using uvtool:
host$ sudo apt install uvtool qemu-efi-aarch64
host$ uvt-kvm create test release=eoan arch=arm64
host$ uvt-kvm ssh test
guest$ sudo perf top
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