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Date: Tue, 06 Aug 2002 17:21:53 +0900 (JST)
Message-Id: <20020806.172153.55999851.hrs@eos.ocn.ne.jp>
To: doc-jp-work@jp.FreeBSD.org
From: Hiroki Sato <hrs@eos.ocn.ne.jp>
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Subject: [doc-jp-work 462] Re: ANNOUNCE: FreeBSD Security Advisory FreeBSD-SA-02:36.nfs
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$B:4F#!wEl5~M}2JBg3X$G$9!#(B

 02:36 $B$H(B 02:37 $B$G$9!#(B

  # $BLu$7$E$i$$$C$9$M$'!#(B

--
| $B:4F#(B $B9-@8!wEl5~M}2JBg3X(B <hrs@eos.ocn.ne.jp>
|                         <hrs@FreeBSD.org> (FreeBSD Project)

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FreeBSD $B%;%-%e%j%F%#4+9p(B $BF|K\8lHG(B
=============================================================================
FreeBSD-SA-02:36.nfs (2002-08-05)
 * Bug in NFS server code allows remote denial of service
=============================================================================

 $B$3$N%a!<%k$O(B, announce-jp $B$KN.$l$?(B

  Subject: ANNOUNCE: FreeBSD Security Advisory FreeBSD-SA-02:36.nfs
  From: FreeBSD Security Advisories <security-advisories@FreeBSD.org>
  Date: Mon, 5 Aug 2002 16:51:06 -0700 (PDT)
  Message-Id: <200208052351.g75Np6cY097801@freefall.freebsd.org>
  X-Sequence: announce-jp 1028

 $B$rF|K\8lLu$7$?$b$N$G$9!#(B

 $B86J8$O(B PGP $B=pL>$5$l$F$$$^$9$,!"$3$NF|K\8lLu$O(B PGP $B=pL>$5$l$F$$$^$;$s!#(B
 $B=$@5%Q%C%AEy$NFbMF$,2~$6$s$5$l$F$$$J$$$3$H$r3NG'$9$k$?$a$K(B PGP $B=pL>$N(B
 $B%A%'%C%/$r9T$J$&$K$O!"86J8$r;2>H$7$F$/$@$5$$!#(B

 $BF|K\8lLu$*$h$S%_%i!<%5%$%HMxMQ$N>\:Y$K$D$$$F$O!"J8Kv$N!V(BA. FreeBSD
 $B%;%-%e%j%F%#4+9p(B $BF|K\8lHG$K$D$$$F!W$r$4Mw$/$@$5$$!#(B


                                     [$BK]Lu<T(B: $B:4F#(B $B9-@8(B <hrs@jp.FreeBSD.org>]
--($B$3$3$+$i(B)

=============================================================================
FreeBSD-SA-02:36.nfs                                        Security Advisory
                                                          The FreeBSD Project

$B%H%T%C%/(B:       $B%j%b!<%H$+$i%5!<%S%9K832967b2DG=$J(B NFS $B%5!<%P%3!<%I$N%P%0(B
                (Bug in NFS server code allows remote denial of service)

$BJ,N`(B:           core
$B%b%8%e!<%k(B:     nfs
$B9pCNF|(B:         2002-08-05
$B%/%l%8%C%H(B:     Mike Junk <junk@isilon.com>
$B1F6AHO0O(B:       4.6.1-RELEASE-p7 $B$h$jA0$N$9$Y$F$N(B FreeBSD $B%j%j!<%9(B
                $B=$@5F|$h$jA0$N(B 4.6-STABLE
$B=$@5F|(B:         2002-07-19 17:19:53 UTC (RELENG_4)
                2002-08-01 19:31:55 UTC (RELENG_4_6)
                2002-08-01 19:31:54 UTC (RELENG_4_5)
                2002-08-01 19:31:54 UTC (RELENG_4_4)
FreeBSD $B$K8GM-$+(B:       NO


I.   $BGX7J(B - Background

The Network File System (NFS) allows a host to export some or all of
its filesystems, or parts of them, so that other hosts can access them
over the network and mount them as if they were on local disks.  NFS is
built on top of the Sun Remote Procedure Call (RPC) framework.

Network File System (NFS) $B$O!"$"$k%[%9%H$N%U%!%$%k%7%9%F%`$N0lIt!"(B
$B$"$k$$$OA4It$r30It$K8x3+$7!"B>$N%[%9%H$+$i%M%C%H%o!<%/7PM3$G(B
$B%m!<%+%k%G%#%9%/$N>l9g$HF1$8$h$&$J%^%&%s%HA`:n$d%"%/%;%9$r2DG=$K(B
$B$9$k$b$N$G$9!#(BNFS $B$O(B Sun Remote Procedure Call (RPC)
$B%U%l!<%`%o!<%/$rMxMQ$7$F$$$^$9!#(B


II.  $BLdBj$N>\:Y(B - Problem Description

A part of the NFS server code charged with handling incoming RPC
messages had an error which, when the server received a message with a
zero-length payload, would cause it to reference the payload from the
previous message, creating a loop in the message chain.  This would
later cause an infinite loop in a different part of the NFS server
code which tried to traverse the chain.

NFS $B%5!<%P$N%3!<%I$K$*$1$k!"E~Ce(B RPC $B%a%C%;!<%8$N=hM}$r(B
$B9T$J$&ItJ,$K$O!"(B0 $B%P%$%H$N%Z%$%m!<%I$r;}$D%a%C%;!<%8$r(B
$B%5!<%P$,<u$1$H$C$?;~$K!"$=$NA0$K<u$1$H$C$?%a%C%;!<%8$N(B
$B%Z%$%m!<%I$r;2>H$7$F$7$^$$!"$=$N7k2L%a%C%;!<%8%A%'!<%s$K%k!<%W$,(B
$B7A@.$5$l$F$7$^$&$H$$$&8m$j$,4^$^$l$F$$$^$9!#$3$l$O(B NFS $B%5!<%P$N(B
$BB>$NItJ,$K$"$k!"%a%C%;!<%8%A%'!<%s$r$?$I$k=hM}$r9T$J$&%3!<%I$G(B
$BL58B%k!<%W$r0z$-5/$3$7$^$9!#(B


III. $B1F6AHO0O(B - Impact

Certain Linux implementations of NFS produce zero-length RPC messages
in some cases.  A FreeBSD system running an NFS server may lock up
when such clients connect.

Linux $B$N(B NFS $B<BAu$N0lIt$K$O!"$"$k>r7o2<$G%G!<%?%5%$%:$,(B 0 $B$N(B
RPC $B%a%C%;!<%8$r@8@.$9$k$b$N$,$"$j$^$9!#(BNFS $B%5!<%P$H$7$FF0:n$7$F$$$k(B
FreeBSD $B%7%9%F%`$O!"$=$N$h$&$J%/%i%$%"%s%H$,@\B3$7$?>l9g$K(B
$B%m%C%/%"%C%W$7$F$7$^$&2DG=@-$,$"$j$^$9!#(B

An attacker in a position to send RPC messages to an affected FreeBSD
system can construct a sequence of malicious RPC messages that cause
the target system to lock up.

$B<eE@$r;}$D(B FreeBSD $B%7%9%F%`$K(B RPC $B%a%C%;!<%8$rAw$k$3$H$,(B
$B$G$-$k967b<T$O!"%7%9%F%`$r%m%C%/%"%C%W$5$;$k$h$&$J0-0U$r;}$C$?(B
RPC $B%a%C%;!<%8$r:n@.$9$k$3$H$,2DG=$G$9!#(B


IV.  $B2sHrJ}K!(B - Workaround

($BLuCm(B: $B<!$N$$$:$l$+0l$D$K=>$C$F$/$@$5$$!#(B)

1) Disable the NFS server: set the nfs_server_enable variable to "NO"
   in /etc/rc.conf, and reboot.
1) NFS $B%5!<%P$rL58z$K$7$^$9!#(B/etc/rc.conf $B$G(B nfs_server_enable $BJQ?t$r(B
   "NO" $B$K@_Dj$7!"%7%9%F%`$r:F5/F0$7$F$/$@$5$$!#(B

   Alternatively, if there are no active NFS clients (as listed by the
   showmount(8) utility), just killing the mountd and nfsd processes
   should suffice.

   $B$^$?!"$b$7@\B3Cf$N(B NFS $B%/%i%$%"%s%H(B (showmount(8) $B%f!<%F%#%j%F%#$G(B
   $BI=<($5$l$^$9(B) $B$,0l$D$b$J$$>l9g$K$O!"C1$K(B mountd $B$H(B nfsd $B$N%W%m%;%9$r(B
   kill $B$9$k$@$1$G==J,$G$9!#(B

2) Add firewall rules to block RPC traffic to the NFS server from
   untrusted hosts.

2) $B?.MQ$G$-$J$$%[%9%H$+$i(B NFS $B%5!<%P$KAw$i$l$k(B RPC $B%H%i%U%#%C%/$r<WCG$9$k(B
   $B$h$&$J%U%!%$%"%&%)!<%k%k!<%k$r@_Dj$7$^$9!#(B


V.   $B2r7h:v(B - Solution

The following patch has been verified to apply to FreeBSD 4.4, 4.5, and
4.6 systems.
$B<!$N=$@5%Q%C%A$O!"(BFreeBSD 4.4, 4.5, 4.6 $B%7%9%F%`$KE,MQ$G$-$k$3$H$,(B
$B3NG'$5$l$F$$$k$b$N$G$9!#(B

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
a) $B0J2<$N>l=j$+$i=$@5%Q%C%A$r%@%&%s%m!<%I$7!"(BPGP $B%f!<%F%#%j%F%#$r;H$C$F(B
   PGP $B=pL>$r3NG'$7$^$9!#(B

# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:36/nfs.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:36/nfs.patch.asc

b) Apply the patch.
b) $B=$@5%Q%C%A$rE,MQ$7$^$9!#(B

# cd /usr/src
# patch < /path/to/patch

c) Recompile your kernel and modules as described in
<URL:http://www.freebsd.org/handbook/kernelconfig.html> and reboot the
system.
c) <URL:http://www.freebsd.org/handbook/kernelconfig.html> $B$K=q$+$l$F$$$k(B
   $B<j=g$K$7$?$,$C$F%+!<%M%k$r:F9=C[$7!"%7%9%F%`$r:F5/F0$7$^$9!#(B


VI.  $B=$@5$N>\:Y(B - Correction details

The following list contains the revision numbers of each file that was
corrected in FreeBSD.
FreeBSD $B$K$*$$$F:#2s=$@5$5$l$?3F%U%!%$%k$N%j%S%8%g%sHV9f$O!"0J2<$N$H$*$j$G$9!#(B

Path                                                             Revision
$B%Q%9L>(B                                                          $B%j%S%8%g%s(B
  Branch
  $B%V%i%s%A(B
- -------------------------------------------------------------------------
src/sys/nfs/nfs_socket.c
  RELENG_4                                                       1.60.2.5
  RELENG_4_6                                                 1.60.2.3.2.1
  RELENG_4_5                                                 1.60.2.1.6.1
  RELENG_4_4                                                 1.60.2.3.4.1
- -------------------------------------------------------------------------


A.   FreeBSD $B%;%-%e%j%F%#4+9p(B $BF|K\8lHG$K$D$$$F(B

$BF|K\8lLu$O(B FreeBSD $BF|K\8l%I%-%e%a%s%F!<%7%g%s%W%m%8%'%/%H(B (doc-jp) $B$,(B
$B;29M$N$?$a$KDs6!$9$k$b$N$G$9!#2a5n$NF|K\8lHG%;%-%e%j%F%#4+9p$O(B

 http://www.FreeBSD.org/ja/security/

$B$K$^$H$a$i$l$F$$$^$9!#(B

$B$?$@$7K]Lu<T$*$h$S(B doc-jp $B$O!"$=$NFbMF$K$D$$$F$$$+$J$kJ]>Z$b(B
$B$$$?$7$^$;$s$N$G$4Cm0U$/$@$5$$!#F|K\8lLu$K$D$$$F$N$40U8+!"$4MWK>!"(B
$B$*Ld$$9g$o$;Ey$O(B doc-jp@jp.FreeBSD.org $B$^$G$*4j$$$7$^$9!#(B

$B$3$N4+9p$NCf$G>R2p$5$l$F$$$k(B WWW $B%5%$%H(B http://www.FreeBSD.org/ $B$*$h$S(B
FTP $B%5%$%H(B ftp://ftp.FreeBSD.org/ $B$K$O(B, $BF|K\$N%_%i!<%5%$%H$,B8:_$7$^$9!#(B
$B%M%C%H%o!<%/$N:.;($r4KOB$9$k$?$a!"$^$:$O%_%i!<%5%$%H$NMxMQ$r(B
$B9MN8$9$k$h$&$*4j$$$7$^$9!#(B

$BF|K\$N%_%i!<%5%$%H$rMxMQ$9$k$K$O!"(B
http://www.FreeBSD.org/ $B$r(B http://www.jp.FreeBSD.org/www.freebsd.org/ $B$K!"(B
ftp://ftp.FreeBSD.org/ $B$r(B ftp://ftp.jp.FreeBSD.org/ $B$K!"(B
$B$=$l$>$lCV$-49$($F$/$@$5$$!#(B

$BB>$NCO0h$r4^$`%_%i!<%5%$%H$K4X$9$k>\:Y$O(B

 http://www.FreeBSD.org/handbook/mirror.html ($B1QJ8(B)
 http://www.FreeBSD.org/ja/handbook/mirror.html ($BF|K\8lLu(B)

$B$K$^$H$a$i$l$F$$$^$9!#(B

$hrs: announce-jp/FreeBSD-SA/02:36,v 1.3 2002/08/06 08:21:46 hrs Exp $

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FreeBSD $B%;%-%e%j%F%#4+9p(B $BF|K\8lHG(B
=============================================================================
FreeBSD-SA-02:37.kqueue (2002-08-05)
 * local users can panic the system using the kqueue mechanism
=============================================================================

 $B$3$N%a!<%k$O(B, announce-jp $B$KN.$l$?(B

  Subject: ANNOUNCE: FreeBSD Security Advisory FreeBSD-SA-02:37.kqueue
  From: FreeBSD Security Advisories <security-advisories@FreeBSD.org>
  Date: Mon, 5 Aug 2002 16:52:03 -0700 (PDT)
  Message-Id: <200208052352.g75Nq3KL097917@freefall.freebsd.org>
  X-Sequence: announce-jp 1029

 $B$rF|K\8lLu$7$?$b$N$G$9!#(B

 $B86J8$O(B PGP $B=pL>$5$l$F$$$^$9$,!"$3$NF|K\8lLu$O(B PGP $B=pL>$5$l$F$$$^$;$s!#(B
 $B=$@5%Q%C%AEy$NFbMF$,2~$6$s$5$l$F$$$J$$$3$H$r3NG'$9$k$?$a$K(B PGP $B=pL>$N(B
 $B%A%'%C%/$r9T$J$&$K$O!"86J8$r;2>H$7$F$/$@$5$$!#(B

 $BF|K\8lLu$*$h$S%_%i!<%5%$%HMxMQ$N>\:Y$K$D$$$F$O!"J8Kv$N!V(BA. FreeBSD
 $B%;%-%e%j%F%#4+9p(B $BF|K\8lHG$K$D$$$F!W$r$4Mw$/$@$5$$!#(B


                                     [$BK]Lu<T(B: $B:4F#(B $B9-@8(B <hrs@jp.FreeBSD.org>]
--($B$3$3$+$i(B)

=============================================================================
FreeBSD-SA-02:37.kqueue                                     Security Advisory
                                                          The FreeBSD Project

$B%H%T%C%/(B:	$B%m!<%+%k$N%f!<%6$,(B kqueue $B5!9=$rMxMQ$7$F%7%9%F%`%Q%K%C%/$r(B
                $BH/@8$5$;$k$3$H$,$G$-$kLdBj(B
                (local users can panic the system using the kqueue mechanism)

$BJ,N`(B:		core
$B%b%8%e!<%k(B:	kqueue
$B9pCNF|(B:		2002-08-05
$B%/%l%8%C%H(B:	Mark Delany <markd@bushwire.net>
$B1F6AHO0O(B:	FreeBSD 4.3-RELEASE
                FreeBSD 4.4-RELEASE
                FreeBSD 4.5-RELEASE
                FreeBSD 4.6-RELEASE
                $B=$@5F|$h$jA0$N(B FreeBSD 4.6-STABLE
$B=$@5F|(B:		2002-08-05 15:05:15 (RELENG_4)
                2002-08-05 15:13:48 (RELENG_4_6)
                2002-08-05 15:13:44 (RELENG_4_5)
                2002-08-05 15:13:40 (RELENG_4_4)
FreeBSD $B$K8GM-$+(B:	YES


I.   $BGX7J(B - Background

The kqueue mechanism allows a process to register interest in
particular events on particular file descriptors, and receive
asynchronous notification when these events occur on the selected
descriptors.

kqueue $B$O!"%W%m%;%9$,%U%!%$%k5-=R;R$GH/@8$9$k%$%Y%s%H$r4F;k$G$-$k(B
$B$h$&$K$9$k$?$a$N5!9=$G$9!#%U%!%$%k5-=R;R$H$=$3$GH/@8$9$k%$%Y%s%H$r(B
$B;XDj$9$k$3$H$G!"%W%m%;%9$O;XDj$7$?%$%Y%s%H$NH/@8;~$K!"$=$NDLCN$r(B
$BHsF14|$K<u$1$H$k$3$H$,$G$-$^$9!#(B


II.  $BLdBj$N>\:Y(B - Problem Description

If a pipe was created with the pipe(2) system call, and one end of the
pipe was closed, registering an EVFILT_WRITE filter on the other end
would cause a kernel panic.

pipe(2) $B%7%9%F%`%3!<%k$r;H$C$F%Q%$%W$,:n@.$7$FJRC<$r%/%m!<%:$7$?8e!"(B
$B$b$&0lJ}$N%Q%$%W=*C<$K(B EVFILT_WRITE $B%U%#%k%?$rEPO?$9$k$H(B
$B%+!<%M%k%Q%K%C%/$,H/@8$7$^$9!#(B

A common scenario in which this could occur is when a process uses a
pipe to communicate with a child and uses kqueue to monitor the pipe,
and the child dies shortly after the fork(2) call, before the parent
has had time to register the filter.

$B$3$l$,LdBj$H$J$kE57?E*$JNc$H$7$F!"<!$N$h$&$J$b$N$,$"$j$^$9!#(B
$B%W%m%;%9$,;R%W%m%;%9$HDL?.$9$k$?$a$K%Q%$%W$r;H$$!"$=$N%Q%$%W$r(B
kqueue $B$r;H$C$F4F;k$7$F$$$k$H$7$^$9!#;R%W%m%;%9$,(B fork(2) $B%7%9%F%`%3!<%k$N(B
$BH/9T8e$9$0!"?F%W%m%;%9$,(B kqueue $B$N%U%#%k%?$r@_Dj$9$kA0$K(B
$B=*N;$7$F$7$^$&$H!"$3$NLdBj$,H/@8$9$k$3$H$K$J$j$^$9!#(B


III. $B1F6AHO0O(B - Impact

A local attacker may cause the system to panic by executing their own
malicious application.

$B%m!<%+%k$N967b<T$O!"0-0U$r;}$C$F:n@.$7$?%"%W%j%1!<%7%g%s$r<B9T$9$k$3$H$G(B
$B%7%9%F%`%Q%K%C%/$rH/@8$5$;$k$3$H$,$G$-$k2DG=@-$,$"$j$^$9!#(B


IV.  $B2sHrJ}K!(B - Workaround

There is no known workaround.

$B2sHrJ}K!$O8+$D$+$C$F$$$^$;$s!#(B


V.   $B2r7h:v(B - Solution

The following patch has been verified to apply to FreeBSD 4.4, 4.5, and
4.6 systems.
$B$3$N=$@5%Q%C%A$O!"(BFreeBSD 4.4, 4.5, 4.6 $B%7%9%F%`$KE,MQ$G$-$k$3$H$,(B
$B3NG'$5$l$F$$$k$b$N$G$9!#(B

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
a) $B0J2<$N>l=j$+$i=$@5%Q%C%A$r%@%&%s%m!<%I$7!"(BPGP $B%f!<%F%#%j%F%#$r;H$C$F(B
   PGP $B=pL>$r3NG'$7$^$9!#(B

# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:37/kqueue.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:37/kqueue.patch.asc

b) Apply the patch.
b) $B=$@5%Q%C%A$rE,MQ$7$^$9!#(B

# cd /usr/src
# patch < /path/to/patch

c) Recompile your kernel as described in
<URL:http://www.freebsd.org/handbook/kernelconfig.html> and reboot the
system.
c) <URL:http://www.freebsd.org/handbook/kernelconfig.html> $B$K=q$+$l$F$$$k(B
   $B<j=g$K$7$?$,$C$F%+!<%M%k$r:F9=C[$7!"%7%9%F%`$r:F5/F0$7$^$9!#(B


VI.  $B=$@5$N>\:Y(B - Correction details

The following list contains the revision numbers of each file that was
corrected in FreeBSD.
FreeBSD $B$K$*$$$F:#2s=$@5$5$l$?3F%U%!%$%k$N%j%S%8%g%sHV9f$O!"0J2<$N$H$*$j$G$9!#(B

Path                                                             Revision
$B%Q%9L>(B                                                          $B%j%S%8%g%s(B
  Branch
  $B%V%i%s%A(B
- -------------------------------------------------------------------------
sys/kern/sys_pipe.c
  RELENG_4                                                      1.60.2.13
  RELENG_4_6                                                1.60.2.12.2.1
  RELENG_4_5                                                1.60.2.11.2.1
  RELENG_4_4                                                1.60.2.10.2.1
- -------------------------------------------------------------------------


A.   FreeBSD $B%;%-%e%j%F%#4+9p(B $BF|K\8lHG$K$D$$$F(B

$BF|K\8lLu$O(B FreeBSD $BF|K\8l%I%-%e%a%s%F!<%7%g%s%W%m%8%'%/%H(B (doc-jp) $B$,(B
$B;29M$N$?$a$KDs6!$9$k$b$N$G$9!#2a5n$NF|K\8lHG%;%-%e%j%F%#4+9p$O(B

 http://www.FreeBSD.org/ja/security/

$B$K$^$H$a$i$l$F$$$^$9!#(B

$B$?$@$7K]Lu<T$*$h$S(B doc-jp $B$O!"$=$NFbMF$K$D$$$F$$$+$J$kJ]>Z$b(B
$B$$$?$7$^$;$s$N$G$4Cm0U$/$@$5$$!#F|K\8lLu$K$D$$$F$N$40U8+!"$4MWK>!"(B
$B$*Ld$$9g$o$;Ey$O(B doc-jp@jp.FreeBSD.org $B$^$G$*4j$$$7$^$9!#(B

$B$3$N4+9p$NCf$G>R2p$5$l$F$$$k(B WWW $B%5%$%H(B http://www.FreeBSD.org/ $B$*$h$S(B
FTP $B%5%$%H(B ftp://ftp.FreeBSD.org/ $B$K$O(B, $BF|K\$N%_%i!<%5%$%H$,B8:_$7$^$9!#(B
$B%M%C%H%o!<%/$N:.;($r4KOB$9$k$?$a!"$^$:$O%_%i!<%5%$%H$NMxMQ$r(B
$B9MN8$9$k$h$&$*4j$$$7$^$9!#(B

$BF|K\$N%_%i!<%5%$%H$rMxMQ$9$k$K$O!"(B
http://www.FreeBSD.org/ $B$r(B http://www.jp.FreeBSD.org/www.freebsd.org/ $B$K!"(B
ftp://ftp.FreeBSD.org/ $B$r(B ftp://ftp.jp.FreeBSD.org/ $B$K!"(B
$B$=$l$>$lCV$-49$($F$/$@$5$$!#(B

$BB>$NCO0h$r4^$`%_%i!<%5%$%H$K4X$9$k>\:Y$O(B

 http://www.FreeBSD.org/handbook/mirror.html ($B1QJ8(B)
 http://www.FreeBSD.org/ja/handbook/mirror.html ($BF|K\8lLu(B)

$B$K$^$H$a$i$l$F$$$^$9!#(B

$hrs: announce-jp/FreeBSD-SA/02:37,v 1.2 2002/08/06 08:12:18 hrs Exp $

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