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Date: Sun, 16 Aug 1998 14:17:55 -0300 (ART)
From: fpscha@schapachnik.com.ar
Reply-To: fpscha@schapachnik.com.ar
To: FreeBSD-gnats-submit@freebsd.org
Subject: Race condition in /stand/sysinstall
X-Send-Pr-Version: 3.2

>Number:         7632
>Category:       bin
>Synopsis:       Race condition in /stand/sysinstall
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    murray
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Aug 16 11:00:00 PDT 1998
>Closed-Date:    Fri Apr 7 18:27:07 PDT 2000
>Last-Modified:  Fri Apr  7 18:30:19 PDT 2000
>Originator:     Fernando P. Schapachnik
>Release:        FreeBSD 2.2.6-RELEASE i386
>Organization:
>Environment:

	

>Description:
/stand/sysinstall creates a temporary file named /tmp/doc.tmp. It first unlink any previous copy and then creates a new one. But between these syscalls somebody can ln -s /etc/passwd /tmp/doc.tmp. This will cause /etc/passwd being overwritten, as sysinstall runs as root.

	

>How-To-Repeat:
Run sysinstall and look at /tmp.

	

>Fix:
/var/run should be used instead of /tmp.
	
	


>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->closed 
State-Changed-By: murray 
State-Changed-When: Fri Apr 7 18:27:07 PDT 2000 
State-Changed-Why:  
This is an old PR that has been fixed long ago.  No such deadlock currently exists. 



Responsible-Changed-From-To: freebsd-bugs->murray 
Responsible-Changed-By: murray 
Responsible-Changed-When: Fri Apr 7 18:27:07 PDT 2000 
Responsible-Changed-Why:  
I reviewed the code looking for deadlocks. 
>Unformatted:
