[Bug 225265] Lack of monotonic clock prolongs the default sudo 5 minutes password caching as long as suspend lasts

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225265

            Bug ID: 225265
           Summary: Lack of monotonic clock prolongs the default sudo 5
                    minutes password caching as long as suspend lasts
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: postutdelning at gmail.com

The five minute caching period of the password in sudo is prolonged when the
laptop is suspended. For example: In the terminal I issue a command with sudo,
I enter my password, one minute later I suspend the laptop, after one hour I
resume and still can issue sudo cammands without being asked for my password
for the rest of the five minutes that remained from before suspending.

Freebsd 11.1-RELEASE  64bit
Laptop: Thinkpad x220

Sudo is used with defaults, except group wheel can issue any command.

Expected bahaviour: The suspend-time should count for the caching period or
maybe even stop the caching of the password immediately.

Originally I have reported a bug directly to the sudo bugzilla:
https://bugzilla.sudo.ws/show_bug.cgi?id=779

But as can be seen in the comments Todd C. Miller answered:

"FreeBSD doesn't appear to have a monotonic clock that runs while the machine
is suspended.  The choice is between using a clock that can run backward,
potentially defeating the point of the timestamp file, or one that cannot run
backward but that is not incremented while suspended.

Currently, sudo uses the second option.  On most other systems, the monotonic
clock either runs while suspended or an alternate clock is available which
does.  I consider this a FreeBSD failing, rather than a sudo one."

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