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Date: Mon, 20 Jan 1997 22:55:34 +0100 (CET)
From: Tor Egge <Tor.Egge@idt.ntnu.no>
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To: FreeBSD-gnats-submit@freebsd.org
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Subject: bin/2541: cd (using /bin/sh) may leave you in the wrong directory
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>Number:         2541
>Category:       bin
>Synopsis:       cd (using /bin/sh) may leave you in the wrong directory
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Jan 20 14:00:00 PST 1997
>Last-Modified:
>Originator:     Tor Egge
>Organization:
Norwegian University of Science and Technology, Trondheim, Norway

>Release:        FreeBSD 3.0-CURRENT i386
>Environment:

FreeBSD ikke.idt.unit.no 3.0-CURRENT FreeBSD 3.0-CURRENT #0: Mon Jan 20 21:59:08 MET 1997     root@ikke.idt.unit.no:/usr/src/sys-UP/compile/TEGGE  i386

>Description:

cd (using /bin/sh) may leave you in the wrong directory.

>How-To-Repeat:

Run the following shell script:

---
#!/bin/sh
cd /tmp
rm -rf /tmp/good /tmp/bad
mkdir good
mkdir good/some
mkdir good/etc
echo  "Test OK" > good/etc/FILE
mkdir bad
mkdir bad/etc
echo  "Test failed" > bad/etc/FILE
ln -s ../good/some bad/some
cd /tmp/bad/some/../etc
cat FILE
/bin/pwd
cd ..
/bin/pwd
cd /tmp
rm -rf /tmp/good /tmp/bad
---


>Fix:
	
Don't blindly eliminate `..' in the target directory name by also 
eliminating the previous component. If the previous component was 
a symbolic link, the elimination might be bogus.

>Audit-Trail:
>Unformatted: