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Topic: Pentium F0 bug

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	Computer Bug Encyclopedia Article, History, Biography @ Local Color Art (Site not responding. Last check: 2007-11-04)
		A computer bug is an error, flaw, mistake, failure, or fault in a computer program that prevents it from working correctly or produces an incorrect result.
		Once the bug is reproduced, the programmer can use a debugger or some other tool to monitor the execution of the program in the faulty region, and (eventually) find the problem.
		Some bugs are triggered by inputs to the program which may be difficult for the programmer to re-create.
	www.somethingpersonal.com /search/encyclopedia/Computer_bug (2157 words)

	Pentium FDIV bug - Wikipedia, the free encyclopedia
		Any Pentium family processor with a clock speed of at least 120 MHz is new enough not to have this bug.
		However, although most independent estimates found the bug to be of little importance and have negligible effect on most uses, it has caused a great public outcry.
		Finally, Intel was forced to offer to replace all flawed Pentium processors, at huge potential cost to the company (however, it turned out that only a small fraction of Pentium owners actually bothered to get their chips replaced).
	en.wikipedia.org /wiki/Pentium_FDIV_bug (310 words)

	Computer bug - Wikipedia, the free encyclopedia
		Bugs arise from mistakes and errors, made by people, in either a program's source code or its design.
		A bug in the code controlling the Therac-25 radiation therapy machine was directly responsible for patient deaths and in 1996, the European Space Agency 's US$1 billion prototype Ariane 5 rocket was destroyed less than a minute after launch, due to a bug in the on-board guidance computer.
		One cause of the Therac-25 radiation machine deaths was a bug that occured only when the machine operator very rapidly entered a treatment plan; it took days of practice to become able to do this, so the bug did not manifest in testing or when the manufacturer attempted to duplicate it.
	en.wikipedia.org /wiki/Computer_bug (1953 words)

	The Pentium F00F Bug
		This bug is especially nasty, because any user can construct a program with this instruction, and upload it to a network computer, or incorporate it within an ActiveX applet.
		The locked memory cycle somehow convinces the internal state of the Pentium to think that a write cycle is going to occur.
		The ultimate solution to the F00F bug problem is obtained when disabling the cache –; indicating that some interaction exists between the cache and the bug.
	www.rcollins.org /ddj/May98/F00FBug.html (2387 words)

	November (Site not responding. Last check: 2007-11-04)
		Pentium bug surfaces - A new bug that crashes Intel (INTC) Pentium processors has been found and is now being discussed openly on the Internet.
		Net reacts to "F0" Pentium bug - As reaction to a new bug that crashes Intel (INTC) Pentium processors spreads across the Internet, the prevailing opinion is that the problem could be serious, though some believe that it simply points to more generic problems with computers.
		Intel bug spawns third-party fixes - Just days after the discovery of a new bug that causes Pentium-based computers to crash, some potential fixes are cropping up even before the release of an official "work-around" from Intel (INTC).
	www.breakpt.org /News/OnlineArchives/CNETNewscom/1997/November (9915 words)

	[ale] Intel confirms bug (fwd)
		Intel acknowledged the "F0" bug this afternoon, saying that it is now looking into a work-around.
		The Pentium F0 bug can freeze up Pentium MMX and "classic" Pentium (non-MMX) computers, machines that number in the hundreds of millions worldwide.
		One interesting aspect of the bug is that, in a crash, because the processor is actually still running, Intel may be able to "discover the state" of the processor and thereby come up with a software fix, Brookwood said.
	www.ale.org /archive/ale/ale-1997-11/msg00106.html (661 words)

	The Intel Pentium F00F Bug (Site not responding. Last check: 2007-11-04)
		This bug is especially nasty, because any user can construct a program with this instruction, and upload it to a network computer, or incorporate it within an Active-X applet.
		Think of it, the bug could be the latest variation of "my dog ate my homework." Therefore the news of the bug had a huge impact in this small community.
		To demonstrate this bug and the various workarounds, I've written two programs to be distributed with this article.
	www.x86.org /errata/dec97/f00fbug.htm (2978 words)

	f00f-bug
		The Pentium "F0" or "F00F" bug — as some are calling it — can freeze up Pentium MMX and "classic" Pentium (non-MMX) computers, machines that number in the hundreds of millions worldwide.
		A number of postings claim that the bug is especially pernicious because it might trigger a rash of attacks on computers, based on the potential to bring down practically any computer on which people can execute programs.
		That bug allows any Intel Pentium/Pentium MMX to be remotely and anonymously caused to hang, merely by sending it byte sequence "F0 0F C7 C8".
	www.linuxmafia.com /faq/Hardware/f00f-bug.html (4542 words)

	Pentium F0 Bug Info (Site not responding. Last check: 2007-11-04)
		This bug is being referred to as the "Pentium F0" bug.
		Pentium II is based on the Pentium Pro architechture so I do not expect it to have this bug.
		In Pentium, this would mean tripping the exception on purpose and then disabling the cache (set CD to 1).
	msowww.anu.edu.au /~peterson/pentium_lock.htm (1701 words)

	Information on CompCore Multimedia and Zoran
		The Pentium F0 Bug is a single "illegal" instruction that can crash the Pentium and Pentium with MMX processors.
		If someone wanted to put a "backdoor" in the Pentium chip design that would give them an "ace up their sleeve" against anyone using a Pentium, the F0 bug would be it.
		Consider the F0 bug from the perspective of military organizations, spies, and criminals.
	www.jmcgowan.com /compcore.html (3693 words)

	Pentium FDIV Bug Encyclopedia Article, History, Biography @ Local Color Art (Site not responding. Last check: 2007-11-04)
		Find the Best Sites For pentium fdiv bug With Starware - Starware search is an excellent resource for quality sites on pentium fdiv bug and much more!
		Look for pentium fdiv bug - Find pentium fdiv bug at one of the best sites the Internet has to offer!
		This result was quickly verified by other people around the Internet, and became known as the Pentium FDIV bug (FDIV is the x86
	www.jobsinart.com /encyclopedia/Pentium_FDIV_bug (493 words)

	Intel confirms Pentium "F0" bug \| CNET News.com
		Though completely different in nature, the F0 bug evokes memories of a calculation glitch in the Pentium found by a mathematics professor back in 1994, which cost Intel close to $500 million dollars.
		The bug should not affect ordinary computer users since the offending instruction is not something that appears in software that people install on their PCs.
		Dataquest, said the bug is similar to glitch found in the IBM 790 computer back in the early 1960s.
	news.com.com /Intel+confirms+Pentium+F0+bug/2100-1001_3-205207.html (533 words)

	Intel Pentium 4 Resources (Site not responding. Last check: 2007-11-04)
		The Intel®; Pentium®; 4 processor is designed to deliver performance across applications; users can truly appreciate and experience the performance...
		Top 5 Intel Pentium 4 motherboards chosen by the About PC Hardware / Reviews Guide based upon experience and research.
		The big news in the PC world over the weekend was the release of the latest version of the Intel Pentium 4 processors.
	www.pentium4processors.co.uk /directory/Intel-Pentium-4.html (216 words)

	PCS Takes Shape in 1998
		Several years ago it was reported that early generation Pentium chips suffered from a double precision division problem in the floating point arithmetic unit, where serious errors, although unlikely, could occur.
		More recently the Pentium Pro was shown to occasionally fail to correctly report a float-to-integer conversion overflow, again creating the possibility of incorrect answers.
		It also does not appear to affect Pentium II or Pentium Pro microprocessors, and does not affect earlier generations of processors such as the 80486.
	www.decodesystems.com /mt/98jan/index.html (1613 words)

	Potentially dangerous Pentium bug discovered (Site not responding. Last check: 2007-11-04)
		Enclosed are four messages from the RISKS Digest, an email forum on risks to the public in computers and related systems, which is one of the oldest standing regular pieces of editory on the Internet.
		Every pentium based server with user access for executing programs can be crashed using this code sequence.
		In either case a flaw (be it a hardware error, software bug, or susceptibility to a strain of bacteria or virus) has the potential to cripple an entire industry, with serious sociological consequences.
	www.cctec.com /maillists/nanog/historical/9711/msg00332.html (944 words)

	OS/2 News and Rumors: March, 1998 (Site not responding. Last check: 2007-11-04)
		Bug fixed: PMMPEG crashed if there is an error in the MPEG file, i.e.
		The "Pentium F00F bug" regards one legal instruction of the Pentium and Pentium MMX processors, that was not available in the 486's.
		The changes are bug fixes on the install program, so, if you already have installed and the drivers are working well, you don't need to download the new ones.
	www.os2ss.com /news/archives/mar98.html (5583 words)

	f (Site not responding. Last check: 2007-11-04)
		Reaction to a new Pentium bug, which Intel confirmed today, is growing all over the Internet.
		Exactly as serious as the new Pentium F0 bug: if you run a multiuser OS on a 6x86 machine, any user with permissions to run a small innocent program may bring...
		The first is designed to be the most general and will always allow some form of F0 generation.
	www.publiweb.org /f/f0.html (346 words)

	November (Site not responding. Last check: 2007-11-04)
		Fed will be OK in 2000 - Critical computers used by the Federal Reserve to move trillions of dollars among U.S. banks will not suffer from the so-called millennium bug, Fed governor Edward Kelley said.
		Bell keeps lines clear of Y2K bug - Bell Atlantic (BEL) said it has begun offering services to address the problems corporate computer networks may face in the year 2000.
		IE 4 has hyperlink bug - Microsoft (MSFT) last night posted a fix to an Internet Explorer 4.0 bug that could turn a hyperlink into a hornet's nest.
	www.essentialresults.com /News/OnlineArchives/CNETNewscom/1997/November (9915 words)

	Everything you need to know about the Pentium `FO' bug (InfoWorld) (Site not responding. Last check: 2007-11-04)
		Answer: This bug causes a Pentium system to freeze up, requiring a hard reset, when certain machine language instructions are executed.
		It reads 8 bytes from memory, compares them with a quantity in a pair of CPU registers, and then overwrites memory with the contents of the registers.
		But because it is so easy to sail past all of the safeguards of a protected-mode operating system with this bug, you must take very strong precautions to protect mission-critical machines.
	www.infoworld.com /cgi-bin/displayNew.pl?/glass/971124bg.htm (510 words)

	[No title] (Site not responding. Last check: 2007-11-04)
		Basically, the opcodes are an invalid form of cmpxchg8b eax with a lock prefix.
		See http://www.rootshell.com/ This code has been tested under Windows NT4 and Linux running on Pentium and Pentium MMX cpus.
		This will NOT work on Pentium Pro and Pentium II, AMD K6 and Cyrix 6x86 cpus.
	www.hoobie.net /security/exploits/hacking/pentium_bug.c (160 words)

	Intel Pentium 4 Resources (Site not responding. Last check: 2007-11-04)
		Buy Pentium 4 laptops at the best price on the internet.
		About Intel Advanced Products Pentium� 4 processor supporting Hyper-Threading Technology Pentium� 4 processor...
		Intel (INTC) released a software work-around for the Pentium "F0" bug, which affects Pentium MMX and Pentium "classic" (non-MMX) microprocessors.
	www.pentium4laptops.co.uk /directory/Intel-Pentium-4.html (172 words)

	Net Express
		Pentium MMX processors are being phased out and will be discontinued in early 1998.
		In order to not encourage more demand for the Pentium Pro processors, Intel plans to keep current Pentium Pro wholesale prices close to their current values until they are effectively replaced by the Deschutes processors in early 1998.
		Pentium, Pentium II, K6 and M2 CPU's that implement MMX include 57 new instructions that assist the processor in doing Matrix Math used in many graphics packages.
	www.tdl.com /~netex/cpu/cpu.html (7138 words)

	LKML: Linus Torvalds: Re: 2.1.63 - testing Pentium bug workaround.. (Site not responding. Last check: 2007-11-04)
		On Wed, 12 Nov 1997, Simon's Mailing List Account wrote: > > The pentium bugfix works the first time an 'exploit' is run, > but the chip locks the second time.
		I'm essentially trying to get both confirmation that yes, it does work, and at the same time trying to see if there are any circumstances under which it fails - so that we can try to track down _why_ it fails.
		So if you have a pentium, and the patches do work for you (try the exploit programs a few times), just send me a quick email with the subject "works for me" or something like that..
	lkml.org /lkml/1997/11/12/118 (265 words)

	denMike's tiny page (Site not responding. Last check: 2007-11-04)
		This bug is therefore not found on Pentium Pro, Pentium II, K6, and Cyrix M1/M2.
		The Pentium-F0 bug is OS-independent, which means, that it will trash ANY OS, including OS/2, Windows NT, Windows 95, and Linux, all of which is thought of as 'safe' OS'es (they won't crash).
		The bug is the result of an invalid instruction.
	mtech.dk /thomsen/program/f0bug.php (1048 words)

	BugNet Alert (FO Pentium bug) (Site not responding. Last check: 2007-11-04)
		NTEL HAS COME up with a work-around for the latest bug to be discovered in their Pentium processor, which is being called either the "F0" bug or the "Invalid Operand with Locked CMPXCHG8B Instruction" bug (the latter has a nice ring to it).
		This bug is more along the lines of a computer virus, in that it can only be triggered by a particular instruction which would have to be given on purpose by a malicious piece of code.
		If this invalid instruction is received by your Pentium chip, your computer will immediately hang.
	www.bugnet.com /alerts/bugalert_1118.html (232 words)

	[No title] (Site not responding. Last check: 2007-11-04)
		http://home.graffiti.net/riftor615/index.html ------------------------------------------------- Category: Hardware [Processor] Title: Pentium/Pentium Pro Bug ------------------------------------------------- This bug causes the processor to lock up, and is a problem with all Pentium and Pentium Pro chips (maybe even MMX ones).
		The asm for this bug is simply:- lock cmp xchg8b eax or the opcodes f0 0f c7 c8 This is where it gets its name from, the f00f bug, because of the opcodes f0 0f :) heh.
		A simple way to exploit it in dos/windows would be to just simply write a quick program in debug or use shell codes.
	www.g615.co.uk /riftor/foof.txt (200 words)

	Linux-Kernel Archive by thread
		Re: Cyrix (was Pentium) DEATH in user-mode B.
		Re: Cyrix (was Pentium) COMA in user-mode Andre Derrick Balsa
		Re: Cyrix (was Pentium) COMA in user-mode B.
	www.uwsg.indiana.edu /hypermail/linux/kernel/9711.1/index.html (2798 words)

	denMike's tiny page (Site not responding. Last check: 2007-11-04)
		This description of the Borland Pascal bug includes several different solutions to the problem, including a Patch program which everybody can use on a compiled executeable file.
		This is a description of the Pentium-F0 bug, including full source of a program which tests for the bug.
		The archive include lists of ports, cmos, opcodes, bugs in the 8086-family (quite many!), and a memory map.
	www.mtech.dk /thomsen/program/index.php (301 words)

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