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Date:      Wed, 16 Mar 2022 22:55:58 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 262604] Feature request: reseed kernel RNG after VM snapshot/resume
Message-ID:  <bug-262604-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D262604

            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 =E2=80=98snapshot' button in VMware), and=
 resumed the
> guest VM multiple times from the same snapshot (using the =E2=80=98revert=
=E2=80=99 button in
> VMware).  We=E2=80=99ve observed that /dev/random produces repeated outpu=
ts each time
> the guest is resumed from the same snapshot.  In the worst case, we=E2=80=
=99ve observed
> repeated outputs for as long as 100 seconds after resumption.

Paper: https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=3D&arnumber=3D6956587

admbugs: 499

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