kern/39913: exec, fork, exit hooks need locking

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>Number:         39913
>Category:       kern
>Synopsis:       exec, fork, exit hooks need locking
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Nov 13 15:50:00 +0000 2008
>Originator:     Andrew Doran
>Release:        5.99.1
>Organization:
The NetBSD Project
>Environment:
n/a
>Description:
As per summary.

>How-To-Repeat:
Code inspection.
>Fix:
The exechooks can be covered by exec_lock.
Another mechanism will be needed for fork and exit hooks.