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The update caused machines to either enter into a bootloop or boot into recovery mode. [15] [16] Almost immediately, Windows virtual machines on the Microsoft Azure cloud platform began rebooting and crashing, [17] and at 06:48 UTC, Google Compute Engine also reported the problem.
When Secure Boot is enabled, it is initially placed in "setup" mode, which allows a public key known as the "platform key" (PK) to be written to the firmware. Once the key is written, Secure Boot enters "User" mode, where only UEFI drivers and OS boot loaders signed with the platform key can be loaded by the firmware.
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Trusted Platform Module (TPM) is an international standard for a secure cryptoprocessor, a dedicated microcontroller designed to secure hardware through integrated cryptographic keys. The term can also refer to a chip conforming to the standard ISO/IEC 11889.
If UEFI Secure Boot is supported, a "shim" or "Preloader" is often booted by the UEFI before the bootloader or EFI-stub-bearing kernel. [11] Even if UEFI Secure Boot is disabled this may be present and booted in case it is later enabled. It merely acts to add an extra signing key database providing keys for signature verification of subsequent ...
In computing, a virtual machine (VM) is the virtualization or emulation of a computer system. Virtual machines are based on computer architectures and provide the functionality of a physical computer. Their implementations may involve specialized hardware, software, or a combination of the two.
AMD Secure Encrypted Virtualization (SEV) [43] and the Secure Nested Paging extension [44] ARM: TrustZone [45] Realm Management Extension / Confidential Compute Architecture (CCA) IBM: IBM Secure Service Container, [46] formerly zACI, first introduced in IBM z13 generation machines (including all LinuxONE machines) in driver level 27. [47]
Bootloader unlocking is the process of disabling the bootloader security that makes secure boot possible. It can make advanced customizations possible, such as installing custom firmware. On smartphones, this can be a custom Android distribution or another mobile operating system. Some bootloaders are not locked at all and some are locked, but ...