Date: Wed, 25 Oct 2000 17:59:33 +0000 From: pdp@nl.demon.net To: FreeBSD-gnats-submit@freebsd.org Cc: pdp@nl.demon.net Subject: bin/22291: getcwd() fails on recently-modified NFS-mounted dirs Message-ID: <E13oUpp-0001q9-00@ftp.server.nl.demon.net>
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>Number: 22291
>Category: bin
>Synopsis: getcwd() fails on recently-modified NFS-mounted dirs
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Oct 25 11:00:00 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator: Phil Pennock
>Release: FreeBSD 4.1.1-STABLE i386
>Organization:
Thus PLC (Demon NL)
>Environment:
FreeBSD FreeBSD 4.1.1-STABLE i386 (src upgraded 2000-09-29)
NFS mount from Network Appliance Netapp
ftp-netapp1:/ftp on /public/pub (nfs, nodev, nosuid)
>Description:
We have an FTP server, mounting publically-available filesystem from a
NetApp. The chroot() point is to local disk, with NFS mounted on /pub
within that environment. With an open FTP connection, the (customised)
server experiences a realpath() failure (EACCESS) if the cwd of the
connection is modified (file added or deleted) via normal login. This
resolves itself either with the passing of time, or by causing a stat of
the directory which isn't stat(".") (CDUP, CD back; or "ls /the/cwd").
The call to realpath() fails in getcwd() (found via gdb).
Using ktrace, we see:
6506 ftpd CALL __getcwd(0xbfbff2ec,0x400)
6506 ftpd RET __getcwd -1 errno 20 Not a directory
This is a directory; it has just been modified recently.
ktrace's of an FTP LIST command when it works and when it fails because
the dir has been modified available upon request. A "diff -u" is
informative.
>How-To-Repeat:
Via Description above. ktraces, diffs, available upon request. Access
to server code can be arranged if desired, but the above shows it to not
be a problem with our code.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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