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Date: Sat, 7 Apr 2001 16:41:50 -0700 (PDT)
From: davidx@viasoft.com.cn
To: freebsd-gnats-submit@FreeBSD.org
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Subject: kern/26416: ctrl+alt+del --- normal user can reboot machine
Sender: owner-freebsd-bugs@FreeBSD.ORG
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>Number:         26416
>Category:       kern
>Synopsis:       ctrl+alt+del --- normal user can reboot machine
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Apr 07 16:50:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     David Xu
>Release:        FreeBSD 4.3RC
>Organization:
Viasoft
>Environment:
All FreeBSD versions.
>Description:
a normal user can login console and press ctrl+alt+del to reboot
machine, there is no way to disable this action even it is what 
root want. a root user can load a tweaked keyboard map to disable
ctrl+alt+del, but a normal user can still load another keyboard map
to re-enable ctrl+alt+del. this is a security problem.

>How-To-Repeat:
login console via normal user, load a bootable keyboard map, press
ctrl+alt+del, kick root away.
>Fix:
options:
  1. disable normal user to load a keyboard map, but if it is a user 
     owned pc, it is kibitzed.
  2. normal user presses ctrl+alt+del has no effect, but if it is 
     a user owned pc, this is also kibitzed. 
  3. final solution, add a sysctl item to let root user enable/disable 
     ctrl+alt+del.

>Release-Note:
>Audit-Trail:
>Unformatted:

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