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Apple has modified the C compiler toolchain that is used to build iBoot in order to advance memory safety since iOS 14. This advancement is designed to mitigate entire classes of common memory corruption vulnerabilities such as buffer overflows , heap exploitations , type confusion vulnerabilities , and use-after-free attacks .
The file also holds the kernel caches, and a "Firmware" folder which contains iBoot, LLB (Low-Level Bootloader), iBSS (iBoot Single Stage), iBEC (iBoot Epoch Change), the Secure Enclave Processor firmware, the Device Tree, Firmware Images (Apple logo, battery images, Recovery mode screen and more), baseband firmware files in .bbfw format ...
Its task is to verify that the Low-Level Bootloader is signed by the Apple Root CA public key before running it. This process is to ensure that no malicious or otherwise unauthorized software can be run on an iOS device. After the Low-Level Bootloader finishes its tasks, it runs the higher level bootloader, known as iBoot. If all goes well ...
OpeniBoot is an open source implementation of Apple's closed source bootloader iBoot. It allows the booting of unsigned code on supported Apple Devices (such as Linux kernels). It also allows to download and install the Android operating system on iPhone , iPad and iPod Touch .
On iPhone, iPad, Apple Watch, iPod Touch, and Apple TV devices, the boot ROM is called "SecureROM" [8] It is a stripped-down version of iBoot. It provides a Device Firmware Upgrade (DFU) mechanism, which can be activated using a special button combination.
iOS jailbreaking is the use of a privilege escalation exploit to remove software restrictions imposed by Apple on devices running iOS and iOS-based [a] operating systems. It is typically done through a series of kernel patches.
An Apple PowerBook 180c displaying the Happy Mac during the startup process In all instances, the startup chimes will be heard upon completion of the boot process (if successful), and a Happy Mac (or the Apple logo on newer versions) will be displayed on the screen to visually indicate that no hardware issues were found during the boot process.
iBoot will select the desired bootloader (potentially configured via Startup Keyboard Combinations or NVRAM), optionally falling back to either the internal macOS Installation, or a recovery system called recoveryOS. [14] [16] [17] Older pre-UEFI Apple–Intel architecture machines required the EFI system partition to be formatted in HFS+.