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"Заявлено об обнаружении бэкдора в процессорах VIA C3" Отправлено Яхз, 11-Авг-18 11:40
Исследователь смог прочитать документацию, это победа! :D http://datasheets.chipdb.org/VIA/Nehemiah/VIA%20C3%... Страница 82: When set to 1, the ALTINST bit in the FCR enables execution of an alternate (not x86) instruction set. While setting this FCR bit is a privileged operation, executing the alternate instructions can be done from any protection level. This alternate instruction set includes an extended set of integer, MMX, floating-point, and 3DNow! instructions along with additional registers and some more powerful instruction forms over the x86 instruction architecture. For example, in the alternate instruction set, privileged functions can be used from any protection level, memory descriptor checking can be bypassed, and many x86 exceptions such as alignment check can be bypassed. This alternate instruction set is intended for testing, debug, and special application usage. Accordingly, it is not documented for general usage. If you have a justified need for access to these instructions, contact your VIA representative.

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Сообщение*:	> Исследователь смог прочитать документацию, это победа! :D > http://datasheets.chipdb.org/VIA/Nehemiah/VIA%20C3%20Nehemiah%20Datasheet%20R113.pdf > Страница 82: > When set to 1, the ALTINST bit in the FCR enables execution > of an alternate (not x86) instruction set. While setting this FCR > bit is a privileged operation, executing the alternate instructions can be > done from any protection level. > This alternate instruction set includes an extended set of integer, MMX, floating-point, > and 3DNow! instructions along with additional registers and some more powerful > instruction forms over the x86 instruction architecture. For example, in the > alternate instruction set, privileged functions can be used from any protection > level, memory descriptor checking can be bypassed, and many x86 exceptions > such as alignment check can be bypassed. > This alternate instruction set is intended for testing, debug, and special application > usage. Accordingly, it is not documented for general usage. If you > have a justified need for access to these instructions, contact your > VIA representative.
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