![]() ![]() There are also programs to deal with firmware updates before operating system startup (like fwupdate and fwupd), and other utilities may live here too. Most of the programs that are expected to run in the UEFI environment are boot loaders, but others exist too. Most modern systems will ship with SB enabled - they will not run any unsigned code by default, but it is possible to change the firmware configuration to either disable SB or to enroll extra signing keys. This means the firmware on these systems will trust binaries that are signed by Microsoft. Most x86 hardware comes from the factory pre-loaded with Microsoft keys. This stops unexpected / unauthorised code from running in the UEFI environment. When SB is enabled on a system, any attempt to execute an untrusted program will not be allowed. Each program that is loaded by the firmware includes a signature and a checksum, and before allowing execution the firmware will verify that the program is trusted by validating the checksum and the signature. SB works using cryptographic checksums and signatures. It is designed to protect a system against malicious code being loaded and executed early in the boot process, before the operating system has been loaded. UEFI Secure Boot (SB) is a verification mechanism for ensuring that code launched by a computer's UEFI firmware is trusted. See the main UEFI page for more details about it. ![]() UEFI is the Unified Extensible Firmware Interface. Testing Secure Boot in a virtual machine.Infrastructure - how signing works in Debian.Making DKMS modules signing by DKMS signing key usable with the secure boot.Using your key to sign modules (Traditional Way). ![]()
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