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Subject: Re: ANNOUNCE: FreeBSD Security Advisory FreeBSD-SA-02:37.kqueue
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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

kqueue $B$O!"%W%m%;%9$,%U%!%$%k5-=R;R$H$=$3$GH/@8$9$k%$%Y%s%H$r(B
$B4F;kBP>]$H$7$FEPO?$G$-$k$h$&$K$7!"$5$i$K!"$=$l$i$N%$%Y%s%H$,(B
$BEPO?$7$?%U%!%$%k5-=R;R$GH/@8$7$?;~$K!"$=$NDLCN$rHsF14|$K(B
$B<u$1$H$k$3$H$,$G$-$k$h$&$K$9$k$?$a$N5!9=$G$9!#(B


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

pipe(2) $B%7%9%F%`%3!<%k$r;H$C$F%Q%$%W$r: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

$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

$B%m!<%+%k$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

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


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

$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) $B0J2<$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) $B=$@5%Q%C%A$rE,MQ$7$^$9!#(B

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

 ($BLuCm(B: /path/to/patch $B$NItJ,$O=$@5%Q%C%A$N%Q%9L>$KCV$-49$($F$/$@$5$$(B)

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

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

$B%Q%9L>(B                                                          $B%j%S%8%g%s(B
  $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
