** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Changed in: ubuntu-z-systems
Importance: Undecided => High
** Changed in: ubuntu-z-systems
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
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https://bugs.launchpad.net/bugs/1962831
Title:
[UBUNTU 20.04] KVM: Enable storage key checking for intercepted
instruction (Backport to focal)
Status in Ubuntu on IBM z Systems:
New
Status in linux package in Ubuntu:
New
Bug description:
Description:
KVM uses lazy storage key enablement as Linux does no longer make use of the
storage keys. When the guest enters keyed mode, then KVM will save/restore the
key during paging, provide change/reference tracking for guest and host and for
all interpreted instructions will do key protection.
If an instruction is intercepted and passed along to userspace (like QEMU) no
storage key protection is checked, though. This is in violation of the
architecture and it can result in misbehaving guests that rely on key
protection for all instructions.
This item will add the missing key checking to MEMOP ioctl.
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