Bug#83390: marked as done (Apache::Constants loops after bad eval()-block)
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and subject line Bug#83390: probably fixed
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Received: (at maintonly) by bugs.debian.org; 24 Jan 2001 14:21:00 +0000
>From remco@ch.twi.tudelft.nl Wed Jan 24 08:21:00 2001
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Date: Wed, 24 Jan 2001 15:20:57 +0100 (CET)
From: Remco Schaar <remco@ch.twi.tudelft.nl>
Reply-To: remco@ch.twi.tudelft.nl
To: maintonly@bugs.debian.org
Subject: Apache::Constants loops after bad eval()-block
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Package: libapache-mod-perl
Version: 1.21.20000309-1
Hi,
I ran into a problem somewhere in my code...
After some hacking I found the origin in Apache::Constants. When I use an
eval() containing broken code (e.g. missing a closing bracket), the usage
of some of the constants cause apache to loop infinite and eat up my
memory slowly but surely...
When using the following files in a directory:
================ .htaccess =========
PerlModule Apache::Registry
AddHandler perl-script .pl
PerlHandler Apache::Registry
================ end ===============
================ nobrokeneval.pl ===
#!/usr/bin/perl -w
use Apache::Constants(":common",":response");
main();
sub main()
{
print "text\n";
eval("bug();\nbug2();");
warn $@ if $@;
print "status:\t" . MOVED . "\n";
}
================ end ===============
================ brokeneval1.pl ====
#!/usr/bin/perl -w
use Apache::Constants(":common",":response");
main();
sub main()
{
print "text\n";
eval("bug()\nbug2();");
warn $@ if $@;
print "status:\t" . SERVER_ERROR . "\n";
}
================ end ===============
================ brokeneval2.pl ====
#!/usr/bin/perl -w
use Apache::Constants(":common",":response");
main();
sub main()
{
print "text\n";
eval("bug()\nbug2();");
warn $@ if $@;
print "status:\t" . MOVED . "\n";
}
================ end ===============
When requesting the above files through apache, the first
(nobrokeneval.pl) will warn in the error.log that bug is no valid
function, and return the regular output.
The second (brokeneval1.pl) will warn in the error.log that something
about
the missing bracket, but will still return the regular output.
The third (brokeneval2.pl) will warn the same thing, but will not return
anything. Instead the apache-process starts looping, wasting CPU and
increasing it's memory usage...
The latter happens with "MOVED", but as well with "BAD_REQUEST",
"AUTH_REQUIRED" etc...
When running a
strace /usr/sbin/apache -X
the code seems to bee looped in breaks and memory-management (brk and
mremap).
Although you might doubt the usefullness of such code, [IMO] there
is. There is an easy fix (just add another
eval("use Apache::Constants(':response;');");
after the "broken eval", it should not be possible that some broken code
can cause such a problem. Although we don't use any such broken code in
production, it is a annoying thing that a typo can kill a
development-machine when you do not pay attention...
I hope this report is usefull... Further questions are welcome!
Relevant packages (Debian/Potato versions):
- libapache-mod-perl 1.21.20000309-1
- apache 1.3.9-13.1
- apache-common 1.3.9-13.1
- perl-5.005 5.005.03-7.1
- libc6 2.1.3-10
with a kernel 2.2.18 on a x86-architecture
Greetings,
Remco
---------------------------------------
Received: (at 83390-done) by bugs.debian.org; 10 Sep 2003 11:01:33 +0000
>From fabbione@fabbione.net Wed Sep 10 06:01:29 2003
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Wed, 10 Sep 2003 13:01:26 +0200 (CEST)
Date: Wed, 10 Sep 2003 13:01:26 +0200 (CEST)
From: Fabio Massimo Di Nitto <fabbione@fabbione.net>
Sender: fabbione@trider-g7.ext.fabbione.net
To: Carl Johnstone <carl.johnstone@gmgrd.co.uk>,
83390-done@bugs.debian.org
Subject: Re: Bug#83390: probably fixed
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Hi Carl,
thanks for testing this problem. I am closing the bug.
Fabio
On Wed, 10 Sep 2003, Carl Johnstone wrote:
>
> to test I had to change the line
>
> print "text\n";
>
> in the scripts to:
>
> print "Content-type: text/html\n\n";
>
>
> I can't reproduce the error with apache 1.3.27.0-2 and libapache-mod-perl 1.27-4
>
> Carl--------------------------------------------------------
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