kern/39935: ksymsread can leak contents of kernel memory to userspace

[ad%netbsd.org@localhost]

>Number:         39935
>Category:       kern
>Synopsis:       ksymsread can leak contents of kernel memory to userspace
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Nov 16 16:25:01 +0000 2008
>Originator:     Andrew Doran
>Release:        5.99.2
>Organization:
The NetBSD Project
>Environment:
n/a
>Description:
ksyms_modunload() preserves symbol tables if /dev/ksyms is open,
however it does not manage the symbol table memory.

>How-To-Repeat:
Code inspection.
>Fix:
Pass ownership of symbol table memory from subr_kobj to kern_ksyms
when ksyms_modload() is called.