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blackra1n is a program that jailbreaks versions 3.1, 3.1.1 and 3.1.2 of Apple's operating system for the iPhone and the iPod Touch, known as iOS.. The program uses a bug in the USB code of the firmware for the iPhone and the iPod Touch, allowing unsigned code to be executed.
JailbreakMe is a series of jailbreaks for Apple's iOS mobile operating system that took advantage of flaws in the Safari browser on the device, [1] providing an immediate one-step jailbreak, unlike more common jailbreaks, such as Blackra1n and redsn0w, that require plugging the device into a computer and running the jailbreaking software from the desktop.
This type of jailbreak allows a user to reboot their phone normally, but upon doing so, the jailbreak and any modified code will be effectively disabled, as it will have an unpatched kernel. Any functionality independent of the jailbreak will still run as normal, such as making a phone call, texting, or using App Store applications.
The evasi0n jailbreak first remounts the root file system as read-write and then achieves persistence by editing the /etc/launchd.conf file, which launchd consults. Evasi0n then applies patches in the kernel, bypassing address space layout randomization by triggering a data fault and reconstructing the kernel slide by reading the faulting instruction from the appropriate ARM exception vector. [5]
Jailbreak (computer science), overcoming deliberate limitations in a computer system: iOS jailbreaking, overriding software limitations on the iPhone, iPod Touch, or iPad
Developers from Chronic Dev Team and iPhone Dev Team released greenpois0n Absinthe (known as just "Absinthe") in January 2012, a desktop-based tool (for OS X, Microsoft Windows, and Linux [30]) to jailbreak the iPhone 4S for the first time and the iPad 2 for the second time, on iOS 5.0.1 for both devices and also iOS 5.0 for iPhone 4S.
PlayStation 3 Jailbreak was the first USB (Universal Serial Bus) chipset that allowed unauthorized execution of code, similar to homebrew, on the PlayStation 3. It works by bypassing a system security check using a memory exploit ( heap overflow ) which occurs with USB devices that allows the execution of unsigned code .
The jail mechanism is an implementation of FreeBSD's OS-level virtualisation that allows system administrators to partition a FreeBSD-derived computer system into several independent mini-systems called jails, all sharing the same kernel, with very little overhead [1].