[2434] in linux-security and linux-alert archive
Re: Problem with red hat 6.1
daemon@ATHENA.MIT.EDU (Greg Elsbernd)
Fri Dec 1 08:39:49 2000
Message-ID: <005d01c05b14$ff24a8c0$0201a8c0@CYGNUS>
From: "Greg Elsbernd" <gelsbern@fuse.net>
To: "nayakvinod" <nayakvinod@hotmail.com>, <linux-alert@redhat.com>
Date: Thu, 30 Nov 2000 16:32:08 -0500
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The problem was that you caused an endless loop.
when hello ran, it ran itself over and over and over til eventually you =
were out of memory. This is not a bug in the kernel, but a bug in the =
shell script. If you had wanted /bin/hello to say hello then you should =
have had=20
$ mkdir bin
$ cat >bin/hello
echo hello
^D
$ chmod 0755 bin/hello
$ hello
Without the echo statement /bin/hello just kept running itself over and =
over.
:)
----- Original Message -----=20
From: nayakvinod=20
To: linux-alert@redhat.com=20
Sent: Wednesday, November 29, 2000 12:57 AM
Subject: Problem with red hat 6.1
I found a problem, nay a very serious bug in red hat 6.1(kernel =
2.2.12).
I login as an ordinary user and did as follows( in fact I wrote a =
faulty shell program and put it in a directory in PATH):
$ mkdir bin
$ cat >bin/hello
hello
^D
$ chmod 0755 bin/hello
$ hello
This system crashed after giving messages like:
syslog: Out of memory
....
......
.....
init : out of memory
First I suspected that the problem is in kernel2.2.12. But when I =
booted RED hat 6.2 with this kernel and run the same culprit shell =
prog, the process terminated with the messge:
bash: Out of memory!
which it should do.
=
Vinod Nayak
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<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2>The problem was that you caused an endless =
loop.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>when hello ran, it ran itself over and over and over =
til=20
eventually you were out of memory. This is not a bug in the =
kernel, but a=20
bug in the shell script. If you had wanted /bin/hello to say hello =
then=20
you should have had </FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV>
<DIV><FONT size=3D2>$ mkdir bin</FONT></DIV>
<DIV><FONT size=3D2>$ cat >bin/hello</FONT></DIV>
<DIV><FONT size=3D2>echo hello</FONT></DIV>
<DIV><FONT size=3D2>^D</FONT></DIV>
<DIV><FONT size=3D2>$ chmod 0755 bin/hello</FONT></DIV>
<DIV><FONT size=3D2>$ hello</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Without the echo statement /bin/hello just kept =
running itself=20
over and over.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>:)</FONT></DIV></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dnayakvinod@hotmail.com=20
href=3D"mailto:nayakvinod@hotmail.com">nayakvinod</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dlinux-alert@redhat.com=20
href=3D"mailto:linux-alert@redhat.com">linux-alert@redhat.com</A> =
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, November 29, =
2000 12:57=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Problem with red hat =
6.1</DIV>
<DIV><BR></DIV>
<DIV><FONT size=3D2>I found a problem, nay a very serious bug in red =
hat=20
6.1(kernel 2.2.12).</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>I login as an ordinary user and did as follows( in =
fact I=20
wrote a faulty shell program and put it in a directory in =
PATH):</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>$ mkdir bin</FONT></DIV>
<DIV><FONT size=3D2>$ cat >bin/hello</FONT></DIV>
<DIV><FONT size=3D2> hello</FONT></DIV>
<DIV><FONT size=3D2>^D</FONT></DIV>
<DIV><FONT size=3D2>$ chmod 0755 bin/hello</FONT></DIV>
<DIV><FONT size=3D2>$ hello</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>This system crashed after giving messages =
like:</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2> syslog: Out of memory</FONT></DIV>
<DIV><FONT size=3D2>....</FONT></DIV>
<DIV><FONT size=3D2>......</FONT></DIV>
<DIV><FONT size=3D2>.....</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>init : out of memory</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>First I suspected that the problem is in =
kernel2.2.12. But=20
when I booted RED hat 6.2 with this kernel and run the =
same=20
culprit shell prog, the process terminated with the =
messge:</FONT></DIV>
<DIV><FONT size=3D2>bash: Out of memory!</FONT></DIV>
<DIV><FONT size=3D2> which it should do.</FONT></DIV>
<DIV><FONT size=3D2> =
=20
=
=20
=
=20
=
=20
Vinod=20
Nayak</FONT></DIV></BLOCKQUOTE></BODY></HTML>
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