BIOS Disassembly Ninjutsu Uncovered (Uncovered series) by Darmawan Salihun

By Darmawan Salihun

Explaining protection vulnerabilities, attainable exploitation eventualities, and prevention in a scientific demeanour, this consultant to BIOS exploitation describes the reverse-engineering strategies used to collect info from BIOS and growth ROMs. SMBIOS/DMI exploitation techniques—including BIOS rootkits and machine defense—and the exploitation of embedded x86 BIOS also are coated

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LocJrr~fIl ,~ 0 :~:::~~~~~ ,~ Fig. 14. Converting values into code ,. D l""_fl .... •• •• I ; ; ; ; Fig. 15. Following the jump Chapter 2: Preliminary Reverse Code Engineering 47 ¥ The next step is to con\'ert the value in this address into a meaningfuJ machine instruction. To do so, press . The result is shown in Fig. 14. Then, you can follow the jump by pressing . The result is shown in Fig. 15. You can return from the jump you've just made by pressing . Up to this point, you've gained significant insight into how to use IDA Pro.

Bit 0 in all BARs is read only and is used to determine whether the BARs map to the memory or I/O address space. 31 4 [ r. 3 2 1 0 B_'~ A_~_,_,,_,____________ ~ ___ __ Pmfetchable Set to one. If there are no side effects on reads, the device returns all bytes on reads regardless of the byte enables, and host bnelges can merge processor Wlites into this range WIthout causing errors. Bit must be sello zero otherwise. Type 00 - Locate anywhere in 32-bit address space 01 - ReseNe

Enable bit atld tlot used ill the base address calculation. That's why it has to be set to one to enable the root-complex configuration cycle. This technique is analogous to the PCI configuration mechanism. The root-complex base address is located in the memory address space of the s)'stem from a CPU perspective. , it works in the Intcl955X-ICH7 chipset. Future chipsets may implement it in a different fashion. Nevertheless, you can read the PCl Express specification to overcome that. Furthermore, another kind of PCI Express enhanced configuration mechanism won't differ much from the current example.

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