Messages in this thread | | | Date | Wed, 3 Mar 1999 08:59:14 -0600 | From | Charles Cazabon <> | Subject | Re: [patch] PIII/Katmai & FXSAVE support, disable serial-#, 2.2.2 |
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Daniel J. Frasnelli <dfrasnel@csee.wvu.edu> wrote: [original attribution lost, probably was <cat@zip.com.au>] > > > > Ie can the cpuid be turned on again by any software? Or is it a one time > > decision for the life of the cpu or the life of a session (between power-on > > and power-off)?
> It is my understanding that the psn microcode is only reactivated > upon system power-up and cannot be activated by a processor reset > "in-flight" during a Linux session. In other words, you do not have to > worry about the psn as long as you boot into a kernel with the deactivation > code.
Intel has said this is the case; however, the German magazine c't has a hacker on staff who has managed to turn the serial number back on from userland, using only documented features of the processor.
See the article at http://www.heise.de/ct/english/99/05/news1/
Charles -- ---------------------------------------------------- Charles Cazabon <charlesc-linux@qcc.sk.ca> Any opinions expressed are just that -- my opinions. ----------------------------------------------------
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