[Bug 262604] Feature request: reseed kernel RNG after VM snapshot/resume

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From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 16 Mar 2022 22:55:58 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262604

            Bug ID: 262604
           Summary: Feature request: reseed kernel RNG after VM
                    snapshot/resume
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: emaste@freebsd.org

This came as a report to secteam@, but should be tracked in the public
bugzilla.

> Specifically, we've run FreeBSD inside VMware workstation 9.0.0, captured a
> full-memory snapshot (using the ‘snapshot' button in VMware), and resumed the
> guest VM multiple times from the same snapshot (using the ‘revert’ button in
> VMware).  We’ve observed that /dev/random produces repeated outputs each time
> the guest is resumed from the same snapshot.  In the worst case, we’ve observed
> repeated outputs for as long as 100 seconds after resumption.

Paper: https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6956587

admbugs: 499

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