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32nd Time The Charm? Latest Linux Lockdown Patches Posted

Submitted by Roy Schestowitz on Thursday 4th of April 2019 03:18:54 PM Filed under
Linux
Google
Security

The Linux "Lockdown" patches to restrict the running kernel image from being modified and to strengthen the boundary between UID 0 and the kernel continues to be revised. Matthew Garrett at Google who is now leading this Linux security effort is hoping to get the code into Linux 5.2 but that remains to be seen -- on Wednesday the thirty-second revision to these patches were posted.

The proposed LOCKDOWN mode forbids writing to /dev/mem, restricts access to PCI BAR and MSRs, doesn't allow kernel module parameters to be used that set hardware settings, disables system hibernation, and other kernel features that could allow changing the hardware state. The lockdown mode isn't enabled by default but is intended to be paired with UEFI SecureBoot and the like within security sensitive environments.

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