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Message-Id: <200401242052.i0OKqcHc044309@www.freebsd.org>
Date: Sat, 24 Jan 2004 12:52:38 -0800 (PST)
From: Stephan Uphoff <ups@tree.com>
To: freebsd-gnats-submit@FreeBSD.org
Subject: Possible use of kqueue_scan on stack marker while stack swapped out
X-Send-Pr-Version: www-2.0

>Number:         61849
>Category:       kern
>Synopsis:       Possible use of kqueue_scan on stack marker while stack swapped out
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    green
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Jan 24 13:00:28 PST 2004
>Closed-Date:    Mon Aug 16 11:07:16 GMT 2004
>Last-Modified:  Mon Aug 16 11:07:16 GMT 2004
>Originator:     Stephan Uphoff
>Release:        current
>Organization:
>Environment:
N/A  
>Description:
kqueue_scan() puts a marker element on the event list.
The marker element lives on the stack.
kqueue_scan() can block (example copyout) and its stack can
be swapped out.
The marker element might be accessed while the stack is swapped out.


>How-To-Repeat:
      
>Fix:
Use PROC_LOCK/PROC_UNLOCK to prevent swapping or use 
non stack memory for the marker element.

>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-bugs->green 
Responsible-Changed-By: green 
Responsible-Changed-When: Thu Apr 15 07:39:17 PDT 2004 
Responsible-Changed-Why:  
I'll fix this, thanks! 

http://www.freebsd.org/cgi/query-pr.cgi?pr=61849 
State-Changed-From-To: open->closed 
State-Changed-By: green 
State-Changed-When: Mon Aug 16 11:06:50 GMT 2004 
State-Changed-Why:  
This is fixed in current now.  Thanks for the bug report! 

http://www.freebsd.org/cgi/query-pr.cgi?pr=61849 
>Unformatted:
