Ø在 x86 系统中，将 1M 空间最上面的 0xF0000 到 0xFFFFF 这 64K 映射给 ROM。 Ø当电脑刚加电的时候，会做一些重置的工作，将 CS 设置为 0xFFFF，将 IP 设置为 0x0000，所以第一条指令就会指向 0xFFFF0，正是在 ROM 的范围内。 Ø在这里，有一个 JMP 命令会跳到 ROM 中做初始化 ...

Unless your computer is pretty old, it probably uses UEFI (Unified Extensible Firmware Interface) to boot. The idea is that a bootloader picks up files from an EFI partition and uses them to start ...

My UEFI experience so far has been limited to only two laptop OEMs, HP/Compaq and Acer. I found the former to be relatively difficult to work with (see the recent Compaq and earlier HP Pavilion posts) ...

Let's start by clearly stating what this post is, and what it isn't. It is a description of how I set up multi-boot for Linux systems, sometimes including Windows, using the GRUB bootloader. It is not ...

UPDATE (December 2 nd, 2024): The bootkit described in this report seems to be part of a project created by cybersecurity students participating in Korea's Best of the Best (BoB) training program. As ...

With the increasing prevalence of open-source implementations and the expansion of personal computing device usage to include mobile and non-PC devices as well as traditional desktops and laptops, ...

UPDATE: November 28, 3:20 PM California time. The headline of this post has been changed. This update is adding the following further details: this threat is not a UEFI firmware implant or rootkit, it ...

Most people don’t understand UEFI (Unified Extensible Firmware Interface) or even know whether their computer has it. An interface layer between an operating system and firmware, UEFI offers much ...