This bug was fixed in the package linux - 4.15.0-42.45
---------------
linux (4.15.0-42.45) bionic; urgency=medium
* linux: 4.15.0-42.45 -proposed tracker (LP: #1803592)
* [FEAT] Guest-dedicated Crypto Adapters (LP: #1787405)
- KVM: s390: reset crypto attributes for all vcpus
- KVM: s390: vsie: simulate VCPU SIE entry/exit
- KVM: s390: introduce and use KVM_REQ_VSIE_RESTART
- KVM: s390: refactor crypto initialization
- s390: vfio-ap: base implementation of VFIO AP device driver
- s390: vfio-ap: register matrix device with VFIO mdev framework
- s390: vfio-ap: sysfs interfaces to configure adapters
- s390: vfio-ap: sysfs interfaces to configure domains
- s390: vfio-ap: sysfs interfaces to configure control domains
- s390: vfio-ap: sysfs interface to view matrix mdev matrix
- KVM: s390: interface to clear CRYCB masks
- s390: vfio-ap: implement mediated device open callback
- s390: vfio-ap: implement VFIO_DEVICE_GET_INFO ioctl
- s390: vfio-ap: zeroize the AP queues
- s390: vfio-ap: implement VFIO_DEVICE_RESET ioctl
- KVM: s390: Clear Crypto Control Block when using vSIE
- KVM: s390: vsie: Do the CRYCB validation first
- KVM: s390: vsie: Make use of CRYCB FORMAT2 clear
- KVM: s390: vsie: Allow CRYCB FORMAT-2
- KVM: s390: vsie: allow CRYCB FORMAT-1
- KVM: s390: vsie: allow CRYCB FORMAT-0
- KVM: s390: vsie: allow guest FORMAT-0 CRYCB on host FORMAT-1
- KVM: s390: vsie: allow guest FORMAT-1 CRYCB on host FORMAT-2
- KVM: s390: vsie: allow guest FORMAT-0 CRYCB on host FORMAT-2
- KVM: s390: device attrs to enable/disable AP interpretation
- KVM: s390: CPU model support for AP virtualization
- s390: doc: detailed specifications for AP virtualization
- KVM: s390: fix locking for crypto setting error path
- KVM: s390: Tracing APCB changes
- s390: vfio-ap: setup APCB mask using KVM dedicated function
- s390/zcrypt: Add ZAPQ inline function.
- s390/zcrypt: Review inline assembler constraints.
- s390/zcrypt: Integrate ap_asm.h into include/asm/ap.h.
- s390/zcrypt: fix ap_instructions_available() returncodes
- s390/zcrypt: remove VLA usage from the AP bus
- s390/zcrypt: Remove deprecated ioctls.
- s390/zcrypt: Remove deprecated zcrypt proc interface.
- s390/zcrypt: Support up to 256 crypto adapters.
- [Config:] Enable CONFIG_S390_AP_IOMMU and set CONFIG_VFIO_AP to module.
* Bypass of mount visibility through userns + mount propagation (LP: #1789161)
- mount: Retest MNT_LOCKED in do_umount
- mount: Don't allow copying MNT_UNBINDABLE|MNT_LOCKED mounts
* CVE-2018-18955: nested user namespaces with more than five extents
incorrectly grant privileges over inode (LP: #1801924) // CVE-2018-18955
- userns: also map extents in the reverse map to kernel IDs
* kdump fail due to an IRQ storm (LP: #1797990)
- SAUCE: x86/PCI: Export find_cap() to be used in early PCI code
- SAUCE: x86/quirks: Add parameter to clear MSIs early on boot
- SAUCE: x86/quirks: Scan all busses for early PCI quirks
-- Thadeu Lima de Souza Cascardo <casca...@canonical.com> Thu, 15 Nov
2018 17:01:46 -0200
** Changed in: linux (Ubuntu Bionic)
Status: Fix Committed => Fix Released
** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-18955
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https://bugs.launchpad.net/bugs/1798441
Title:
Allow signed kernels to be kexec'ed under lockdown
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Released
Bug description:
[Impact]
Under kernel lockdown, one can't kexec unless it's using kexec_file_load with
a signed kernel.
[Test case]
It was verified that a signed kernel could be loaded with kexec -s, and
properly booted.
[Regression Potential]
A security issue, as we allow more kernels to be loaded than we would like
to. Though, that's already the case in cosmic.
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