About: Pentium F00F bug

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The Pentium F00F bug is a design flaw in the majority of Intel Pentium, Pentium MMX, and Pentium OverDrive processors (all in the P5 microarchitecture). Discovered in 1997, it can result in the processor ceasing to function until the computer is physically rebooted. The bug has been circumvented through operating system updates. The name is shorthand for F0 0F C7 C8, the hexadecimal encoding of one offending instruction. More formally, the bug is called the invalid operand with locked CMPXCHG8B instruction bug.

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rdf:type	yago:Animal100015388 yago:Arthropod101767661 yago:Bug102236355 yago:Insect102159955 yago:Invertebrate101905661 yago:LivingThing100004258 yago:Object100002684 yago:Organism100004475 yago:PhysicalEntity100001930 yago:WikicatHardwareBugs yago:Whole100003553
rdfs:label	Pentium-F00F-Bug (de) Pentium F00F バグ (ja) Pentium F00F bug (en) Bug F00F do Pentium (pt) F0 0F C7 C8 (ru) F00F-buggen (sv) 0xF00FC7C8 (uk)
rdfs:comment	Als F00F-Bug oder kurz F0-Bug wird ein Fehler in Mikroprozessoren der Typen Intel Pentium, Pentium MMX, Pentium OverDrive (alle Prozessoren der P5-Reihe, außer der Quark CPU) bezeichnet. Der Name bezieht sich auf die hexadezimale Darstellung des Assemblerbefehls, der den Fehler auslöst. Die offizielle Bezeichnung seitens Intel lautet invalid operand with locked CMPXCHG8B instruction (deutsch: „Ungültiger Operand mit gesperrter CMPXCHG8B-Anweisung“). (de) The Pentium F00F bug is a design flaw in the majority of Intel Pentium, Pentium MMX, and Pentium OverDrive processors (all in the P5 microarchitecture). Discovered in 1997, it can result in the processor ceasing to function until the computer is physically rebooted. The bug has been circumvented through operating system updates. The name is shorthand for F0 0F C7 C8, the hexadecimal encoding of one offending instruction. More formally, the bug is called the invalid operand with locked CMPXCHG8B instruction bug. (en) f00f("foof"と発音する)は、IntelのPentium、Pentium MMX、Pentiumオーバードライブプロセッサの、ある世代以前のモデルにある、公開されている設計上の不具合の通称である。問題を起こす機械語バイト列「f0 0f c7 c8」の先頭2バイトの16進表現に由来する。 Intelはこの問題を「ロック付CMPXCHG8B命令の無効オペランドエラッタ」と呼んでいる。 (ja) F00F-buggen är en bugg i första generationens Pentiumprocessorer (P5) från Intel, som gör att processorn låser sig och systemet stannar. Benämningen står för den hexadecimala representationen av den maskinkod som utlöser låsningen. (sv) F0 0F C7 C8 — последовательность байтов, формирующих недействительную машинную команду процессоров семейства x86. В процессорах Pentium MMX и Pentium OverDrive, вследствие аппаратной недоработки, команда, будучи выполненной на любом уровне привилегий, приводила к мёртвому зависанию процессора, что отрицательно сказывалось на надёжности системы в целом. (ru) 0xF00FC7C8 — послідовність байтів, що формувала команду lock cmpxchg8b eax процесорів сімейства x86. У процесорах Pentium MMX та , внаслідок апаратного недоопрацювання, команда, будучи виконаною на будь-якому рівні привілеїв, призводила до «мертвого» зависання процесорів, що негативно позначалося на надійності системи в цілому. (uk) O bug f00f do Pentium é uma falha de segurança dos processadores desta família que permite a um travar o funcionamento do processador. Seu nome é uma abreviatura da instrução causadora do bug f0 0f c7 c8, que representa: lock cmpxchg8b eax. O problema deriva-se de que não ocorre tratamento de exceção para o comendo se o programador adicionar "lock" antes dela, fazendo então com que todo o sistema pare. (pt)
dcterms:subject	1997 in computing Computer folklore X86 architecture Denial-of-service attacks Hardware bugs
Wikipage page ID	1377892 (xsd:integer)
Wikipage revision ID	1103532444 (xsd:integer)
Link from a Wikipage to another Wikipage	Processor register Denial-of-service attack Pentium (brand) Pentium FDIV bug Cyrix coma bug Double fault Meltdown (security vulnerability) Copy-on-write Operand Stepping level Common Vulnerabilities and Exposures Hardware bug Atomic operation Pentium OverDrive Byte CMPXCHG8B 1997 in computing Data loss Computer folklore X86 architecture Dr. Dobb's Journal Exception handling P5 (microarchitecture) PC World Page cache Ring 0 (computer security) Halt and Catch Fire (computing) Hexadecimal Triple fault Denial-of-service attacks Hardware bugs Spectre (security vulnerability) Instruction (computer science) Intel Microprocessor Operating system X86 Workaround PC World Communications Pentium MMX CNET News
Link from a Wikipage to an external page	https://books.google.com/books%3Fid=CEZVAAAAMAAJ http://www.drdobbs.com/embedded-systems/the-pentium-f00f-bug/184410555 http://support.intel.com/support/processors/pentium/ppiie/index.htm http://support.microsoft.com/kb/q163852/ http://www.cnet.com/news/net-reacts-to-f0-pentium-bug/ https://cve.mitre.org/cgi-bin/cvename.cgi%3Fname=CVE-1999-1476
sameAs	Pentium F00F bug Pentium F00F bug Pentium F00F bug Pentium F00F bug Pentium F00F bug Pentium F00F bug Pentium F00F bug Pentium F00F bug Pentium F00F bug Pentium F00F bug Pentium F00F bug
dbp:wikiPageUsesTemplate	dbt:Cite_journal dbt:Dead_link dbt:Reflist dbt:Short_description dbt:Use_dmy_dates dbt:Use_list-defined_references
cs1-dates	y (en)
date	June 2022 (en)
has abstract	Als F00F-Bug oder kurz F0-Bug wird ein Fehler in Mikroprozessoren der Typen Intel Pentium, Pentium MMX, Pentium OverDrive (alle Prozessoren der P5-Reihe, außer der Quark CPU) bezeichnet. Der Name bezieht sich auf die hexadezimale Darstellung des Assemblerbefehls, der den Fehler auslöst. Die offizielle Bezeichnung seitens Intel lautet invalid operand with locked CMPXCHG8B instruction (deutsch: „Ungültiger Operand mit gesperrter CMPXCHG8B-Anweisung“). (de) The Pentium F00F bug is a design flaw in the majority of Intel Pentium, Pentium MMX, and Pentium OverDrive processors (all in the P5 microarchitecture). Discovered in 1997, it can result in the processor ceasing to function until the computer is physically rebooted. The bug has been circumvented through operating system updates. The name is shorthand for F0 0F C7 C8, the hexadecimal encoding of one offending instruction. More formally, the bug is called the invalid operand with locked CMPXCHG8B instruction bug. (en)

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