WebThe Pentium F00F bug is a real-world example of how a sequence of instructions can lock a processor. The "cmpxchg8b" instruction compares contents of registers with a memory location. The operand is expected to be a memory location, but in the bad code snippet it is the eax register. WebAls F00F-Bug oder kurz F0-Bug wird ein Fehler in Mikroprozessoren der Typen Intel Pentium, Pentium MMX, Pentium OverDrive 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[2] .
The Pentium F00F Bug (1998) Hacker News
WebWhat causes the bug is not an interruptmask, nor are interrupts being explicitly disabled. Instead, an anomaly in the Cyrix's instruction pipelineprevents interrupts from being serviced for the duration of the loop; since the loop never ends, interrupts will never be serviced. Web9. dec 2024 · 123 subscribers Subscribe The model of Pentium 120MHz that is in my NEC Versa 4000 is affected by an infamous bug which, when executed, causes the processor to completely lock up. … how many series of downton are there
Cyrix coma bug - Wikipedia
http://rcollins.org/Errata/Dec97/F00FBug.html 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 … Zobraziť viac In the x86 architecture, the byte sequence F0 0F C7 C8 represents the instruction lock cmpxchg8b eax (locked compare and exchange of 8 bytes in register EAX). The bug also applies to opcodes ending in C9 through CF, … Zobraziť viac • CMPXCHG8B • Denial-of-service attack • Pentium FDIV bug Zobraziť viac • Intel Pentium erratum • Microsoft Knowledge Base article • F00F CVE bug entry Zobraziť viac Although a definite solution to this problem required some sort of hardware/firmware revision, there were proposed workarounds at the time which prevented the exploitation of this issue in generating a denial-of-service attack on the affected … Zobraziť viac • Crothers, Brooke (1997-11-10). "Net reacts to "F0" Pentium bug". CNET News. Retrieved 2015-07-27. • Collins, Robert R. (1998-05-01). "The Pentium F00F Bug". Dr. Dobb's Journal. Retrieved 2015-07-27. • PC World. PC World Communications. 16: 55. 1998 Zobraziť viac Web5. jan 2024 · The 1997 bug, which came to be known as the F00F bug, allowed a malicious person to freeze up Pentium MMX and "classic" Pentium computers. Any Intel … how many series of brokenwood