Moenjiniere oa Meta lethathamong la mangolo la moqapi oa kernel Linux Ke hlokometse bothata ka taelo ea RDSEED ho liprosesara tsa AMD tse thehiloeng ho Zen 5 microarchitecture. Litekong tse entsoeng, taelo ea RDSEED, e fanang ka phihlello ho jenereithara ea entropy ea hardware, e khutlisitse 0 ka folakha e atlehileng ea ho phethela ts'ebetso (CF=1) maemong a 10%. Kaha 0 e boetse e khutlisoa ha nomoro e sebetsang e sa reroang e ke ke ea khutlisoa, 'me boemo bona bo bontšoa ke folakha e fapaneng ea ho phethela ts'ebetso (CF=0), ho nahanoa hore liprosesara tsa AMD li na le phoso e etsang hore boemo ba ts'ebetso bo khethoe ka phoso.
Ka hare ho motheo Linux Taelo ena e sebelisoa e le e 'ngoe ea likarolo tsa ho hlahisa entropy ho jenereithara ea linomoro tsa pseudorandom ea software. Ho na le mehloli e mengata ea entropy, kahoo bothata ba RDSEED ha bo ame boleng bo akaretsang ba linomoro tse sa reroang tse hlahisoang ke kernel. Ho lokollotsoe patch bakeng sa kernel e thibelang ts'ebeliso ea taelo ea RDSEED lits'ebetsong tse nang le liprosesa tse itseng tsa AMD tse thehiloeng ho Zen 5 microarchitecture.
Taba ena e ile ea tsejoa qalong ho AMD EPYC Turin CPUs empa hamorao ea phetoa ho mofuta o mong oa AMD CPU o nang le microarchitecture e tšoanang. Ka hona, sebakeng sa ho e thibela ka boikhethelo, ho ile ha etsoa tlhahiso ea ho tima RDSEED ho li-processor tsohle tsa AMD Zen 5. Ke habohlokoa ho hlokomela hore ho lekoa ts'ebetso e nepahetseng ea RDSEED ho li-processor tse fapaneng ho entsoe nakong ea lipatlisiso tsa taba e 'ngoe ea RDSEED e hlahileng ho Zen2 Cyan Skillfish CPUs,' me, maemong a mang, e entse hore 0xffffffff e khutlisetsoe. Nakong e fetileng, li-processor tsa AMD li ne li e-na le mathata ka taelo ea RDRAND e sa sebetseng hantle ka mor'a hore ba khutle mokhoeng oa ho robala.
Source: opennet.ru
