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Message-Id: <200206191507.g5JF7dYU096490@www.freebsd.org>
Date: Wed, 19 Jun 2002 08:07:39 -0700 (PDT)
From: Robert Jan <rj@xs4all.nl>
To: freebsd-gnats-submit@FreeBSD.org
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Subject: kern/39527: getcwd() and unreadable parent directory
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>Number:         39527
>Category:       kern
>Synopsis:       getcwd() and unreadable parent directory
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jun 19 08:10:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Robert Jan
>Release:        4.5-RELEASE
>Organization:
XS4ALL Internet
>Environment:
FreeBSD xs0.xs4all.nl 4.5-RELEASE-p3 FreeBSD 4.5-RELEASE-p3 #5: Tue Apr 23 10:22:45 CEST 2002     cor@xs0.xs4all.nl:/usr/src/sys/compile/XS0  i386

>Description:
When working in a directory of which a parent directory is not readable to you, deleting a subdirectory in the current working directory seems to invalidate the directory cache, causing calls to getcwd() to fail with a Permission Denied error, which it did not before. stat()ing the full path to the current working directory seems to re-initialize the cache and solve the problem. stat()ing "." or the chdir() system call do not solve the problem.

This bug was reproduced on FreeBSD 4.2, 4.5, 4.6-RC and 5.0-CURRENT.

>How-To-Repeat:
As root do:

root# cd /tmp && mkdir -p foo/bar && chmod 711 foo && chown user foo/bar

As user do:

user$ cd /tmp/foo/bar
user$ mkdir foo && rmdir foo
user$ /bin/pwd
pwd: .: Permission denied


>Fix:
user$ cd .
user$ /bin/pwd
/tmp/foo/bar

It is the stat() call on /tmp/foo/bar that fixes the problem.

>Release-Note:
>Audit-Trail:
>Unformatted:

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