From owner-freebsd-stable@FreeBSD.ORG  Wed Jul  2 05:22:43 2003
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 4BB0C37B401
	for <freebsd-stable@freebsd.org>;
	Wed,  2 Jul 2003 05:22:43 -0700 (PDT)
Received: from ruff.infosec.ru (ruff.infosec.ru [194.226.94.211])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 4323144011
	for <freebsd-stable@freebsd.org>;
	Wed,  2 Jul 2003 05:22:42 -0700 (PDT)
	(envelope-from blaze@infosec.ru)
Received: from nt_server.infosec.ru (nt_server.infosec.ru [200.0.0.5])
	by ruff.infosec.ru (Postfix) with ESMTP id 4C2DCBC21
	for <freebsd-stable@freebsd.org>;
	Wed,  2 Jul 2003 16:23:00 +0400 (MSD)
Received: from cubesrv (unverified) by nt_server.infosec.ru
	<T63303bc3a6c8000005f34@nt_server.infosec.ru> for
	<freebsd-stable@freebsd.org>; Wed, 2 Jul 2003 16:23:05 +0400
From: "Andrey Sverdlichenko" <blaze@infosec.ru>
To: <freebsd-stable@freebsd.org>
Date: Wed, 2 Jul 2003 16:23:00 +0400
Message-ID: <2098E9F95A6DFA4D8FE8B6BE30B62E087C187A@nt_server.infosec.ru>
MIME-Version: 1.0
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: 7bit
X-Priority: 3 (Normal)
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook, Build 10.0.4024
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
Importance: Normal
Subject: msdosfs bug?
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Production branch of FreeBSD source code
	<freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 02 Jul 2003 12:22:43 -0000

Hello.

After running this program with msdosfs mounted in /mnt, I got a 
file with some garbage in skipped space. Is it a bug in my local
installation/hardware or real kernel bug?

FreeBSD xen.infosec.ru 4.8-RELEASE FreeBSD 4.8-RELEASE #0: Thu Apr 17
16:53:27 MSD 2003     root@xen.infosec.ru:/usr/src/sys/compile/XEN  i386

#include <fcntl.h>
#include <unistd.h>

int
main(void) {
	char buf[100] = "placeholder";
	off_t pos;
	int handle = open("/mnt/foo", O_RDWR | O_CREAT | O_TRUNC, 0664);

	if (handle == -1)
		return 1;

	pos = lseek(handle, 1024 * 16 - 100, SEEK_SET);
	if (pos != 1024 * 16 - 100)
		return 1;

	if (write(handle, buf, 100) != 100)
		return 1;

	if (close(handle))
		return 1;

	return 0;
}