Download E-books BIOS Disassembly Ninjutsu Uncovered (Uncovered series) PDF

Explaining defense vulnerabilities, possible exploitation situations, and prevention in a scientific demeanour, this consultant to BIOS exploitation describes the reverse-engineering recommendations used to collect details from BIOS and growth ROMs. SMBIOS/DMI exploitation techniques—including BIOS rootkits and computing device defense—and the exploitation of embedded x86 BIOS are additionally covered.

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Bits 3263. software program wrlte$ OFFFFFFFFh to either registers, reads them Nck, and com· bmes the outcome right into a 64-blt worth. dimension cafcul6tiOn is completed at the 64-blt price. it is dcar from the previous implementation notice that the BIOS can "interrogatc" the PCI machine to understand the handle area intake of a PCI machine. Upon figuring out this knowledge, BIOS can application the BAR to an unused handle in the processor tackle area. Then. with the intake info for the deal with house, the BIOS can software the subsequent BAR to be put within the subsequent unused handle house above the former BAR handle. The latter BAR needs to be positioned no less than within the deal with that is calculated with the subsequent formulation: even though. it really is legitimate to software the BAR above the handle calculated with the previous formulation. With those, the entire process deal with map could be functioning perfectly. This relocatable point is without doubt one of the key houses that the PCI equipment brings to the desk to get rid of the handle area collision that after used to be the nightmare of ISA units. '. four. 1. Proprietary Interchipset Protocol know-how Motherboard chipset owners have constructed their very own proprietary interchipset protocol among the northbridge and the southbridge in those previous couple of years, resembling through with V-Link. SiS with MuTIOL, and Intel with hub interface (HI ). 24 half I: the fundamentals @ those protocols are orlly an imerim sollltiorl to the bandwidth challenge among the peripherals that dwell within the laptop! expamion slots, orl-board PCI chips, arid tile major reminiscence, i. e. , process RAM. With the presence of more moderen and quicker bus protocols comparable to PCI convey and HyperTransport available in the market, those intervening time recommendations are quickly being moved out of use. notwithstanding, reviewing them is necessary to dean up concerns that would plague you when you realize the matter of realizing the way it matches to the BIOS scene. those proprietary protocols are obvious from configuration and initialization standpoints. they don't get a hold of whatever new. All are utilising a PCI configuration mechanism to configure PCI compliant units attached to the northbridge and southbridge. The interchipset hyperlink often is considered as a bus connecting the northbridge and the southbridge. This "protocol transparency" is required to reduce the impression of the protocol at the funding had to enforce it. as an instance, the Intel 865PE-ICH5 chipset pointed out this estate sincerely within the i865PE datasheet, as follows: In a few prevlOvs chipsets, the -HeW [the Intel 95SX northbridge] and the -I/O Controller Hub (lCHxr have been bodily attached through PCJ bus O. From a configuration point of view, either parts looked to be on computer] bus zero, whiCh WilS additionally the system's basic computer! growth bus. The MOl contained PCl dewces whereas the ICHx used to be thought of one laptop] machine WIth a number of services. within the 86SPE/86SP chIpset platform the confl9uratiOn constitution IS signlflc4ntly assorted. The fIlCH and the ICHS are physiclJlly attached through the hub interface, so, from a configuratiOn perspective, the hub interface is logiCdlly PCI bus O.

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