Perl, Possible bug in RE handling - confirmation requested

Possible bug in RE handling - confirmation requested

Author	Message
John D. Hard #1 / 6	Possible bug in RE handling - confirmation requested In my procmail+perl email sanitizing filters the following regular expression occurs: s/<BODY\s+(([^">]+("(\\.\|[^"])")?))ONLOAD/<BODY $1 DEFANGED-ONLOAD/gi; I have had a report that it fails to exit on SunOS 4.1.3 + Perl 5.004, causing high CPU loads. I have tested it on Linux 2.0.33 + Perl 5.004_01, SunOS 4.1.4 + Perl 5.004_04 and Alpha OSF/1 V3.0 + Perl 5.004_04 Can anyone confirm this for me? Test it by running the following text through "perl -p -e 'above-RE'": <body> <body junk> <body onload=""> <body junk onload=""> <body junk=">" onload=""> <body junk="\">" onload=""> Perl should not hang. Thanks! -- pgpk -a finger://gonzo.wolfenet.com/jhardin PGP key ID: 0x41EA94F5 PGP key fingerprint: A3 0C 5B C2 EF 0D 2C E5 E9 BF C8 33 A7 A9 CE 76 ----------------------------------------------------------------------- Your mouse has moved. Windows NT must be restarted for the change to take effect. Reboot now? [ OK ] ----------------------------------------------------------------------- 78 days until Daylight Savings Time ends
Wed, 24 Jan 2001 03:00:00 GMT

Tom Christianse #2 / 6	Possible bug in RE handling - confirmation requested [courtesy cc of this posting sent to cited author via email] :causing high CPU loads. I have tested it on Linux 2.0.33 + Perl 5.004_01, :SunOS 4.1.4 + Perl 5.004_04 and Alpha OSF/1 V3.0 + Perl 5.004_04 : :Can anyone confirm this for me? I can confirm that Linux 2.0.33 and either Perl 5.004_04 or 5.005_02, that it works fine and does not hang. --tom -- Let's say the docs present a simplified view of reality... :-)
Wed, 24 Jan 2001 03:00:00 GMT

John D. Hard #3 / 6	Possible bug in RE handling - confirmation requested Quote: >:causing high CPU loads. I have tested it on Linux 2.0.33 + Perl 5.004_01, >:SunOS 4.1.4 + Perl 5.004_04 and Alpha OSF/1 V3.0 + Perl 5.004_04 >: >:Can anyone confirm this for me? > I can confirm that Linux 2.0.33 and either Perl 5.004_04 or 5.005_02, > that it works fine and does not hang. > --tom Thanks. Can anybody running SunOS 4.1.3 + Perl 5.004_04 try this? That's the only platform I've had a failure report on so far. -- pgpk -a finger://gonzo.wolfenet.com/jhardin PGP key ID: 0x41EA94F5 PGP key fingerprint: A3 0C 5B C2 EF 0D 2C E5 E9 BF C8 33 A7 A9 CE 76 ----------------------------------------------------------------------- Your mouse has moved. Windows NT must be restarted for the change to take effect. Reboot now? [ OK ] ----------------------------------------------------------------------- 78 days until Daylight Savings Time ends
Wed, 24 Jan 2001 03:00:00 GMT

Alan Schwar #4 / 6	Possible bug in RE handling - confirmation requested Quote: >>:causing high CPU loads. I have tested it on Linux 2.0.33 + Perl 5.004_01, >>:SunOS 4.1.4 + Perl 5.004_04 and Alpha OSF/1 V3.0 + Perl 5.004_04 >>: >>:Can anyone confirm this for me? >> I can confirm that Linux 2.0.33 and either Perl 5.004_04 or 5.005_02, >> that it works fine and does not hang. >> --tom >Thanks. >Can anybody running SunOS 4.1.3 + Perl 5.004_04 try this? That's the only >platform I've had a failure report on so far. SunOS 4.1.3_U1 and Perl 5.004_04 does not hang. I get this output: <body> <body junk> <BODY DEFANGED-ONLOAD=""> <BODY junk DEFANGED-ONLOAD=""> <BODY junk=">" DEFANGED-ONLOAD=""> <BODY junk="\">" DEFANGED-ONLOAD=""> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Asst. Prof. of Clinical Decision Making \| University of Illinois at Chicago Adj. Asst. Prof. of Psychology \| Department of Medical Education "Life is what happens to you while you're busy making other plans" -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Wed, 24 Jan 2001 03:00:00 GMT

John D. Hard #5 / 6	Possible bug in RE handling - confirmation requested Quote: > In my procmail+perl email sanitizing filters the following regular > expression occurs: > s/<BODY\s+(([^">]+("(\\.\|[^"])")?))ONLOAD/<BODY $1 DEFANGED-ONLOAD/gi; > I have had a report that it fails to exit on SunOS 4.1.3 + Perl 5.004, > causing high CPU loads. I have tested it on Linux 2.0.33 + Perl 5.004_01, > SunOS 4.1.4 + Perl 5.004_04 and Alpha OSF/1 V3.0 + Perl 5.004_04 > Can anyone confirm this for me? > Test it by running the following text through "perl -p -e 'above-RE'": > <body> > <body junk> > <body onload=""> > <body junk onload=""> > <body junk=">" onload=""> > <body junk="\">" onload=""> > Perl should not hang. Thirty whacks with the stupid stick for me. The test data I was using (of which the above is a sample) didn't tickle the RE parser into backtracking. I have changed the RE to a form that does not backtrack, and it now exits quickly. Thanks to everyone who responded, and sorry for wasting your time. -- pgpk -a finger://gonzo.wolfenet.com/jhardin PGP key ID: 0x41EA94F5 PGP key fingerprint: A3 0C 5B C2 EF 0D 2C E5 E9 BF C8 33 A7 A9 CE 76 ----------------------------------------------------------------------- Your mouse has moved. Windows NT must be restarted for the change to take effect. Reboot now? [ OK ] ----------------------------------------------------------------------- 76 days until Daylight Savings Time ends
Fri, 26 Jan 2001 03:00:00 GMT

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