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Difference between revisions of "Dual Boot Exploit"
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== Credit == |
== Credit == |
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| + | [[iPhone Dev Team]] |
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| − | |||
== Exploit == |
== Exploit == |
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| + | The user would create a copy of the currently installed jailbroken OS to /dev/disk0s3, then in iTunes update to the latest unjailbroken firmware. They would then boot to the jailbroken OS, SSH in, and mount /dev/disk0s1, where the unjailbroken OS was. Finally, they would copy over Installer / OpenSSH / Terminal to the unjailbroken OS. |
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| + | |||
| + | === Defeating Countermeasures === |
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| + | In 1.1.1, a routine called "check_for_suspicious_partitions()" came about, in which for any partition other than the System partition (/dev/disk0s1), it would stat(); "/sbin/launchd" to check the existance of the file. The [[iPhone Dev Team]] got around this by simply making /sbin/launchd a symlink to the actual launchd in /mysbin/launchd. Since stat(); does not follow symlinks, this workaround worked great. |
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| + | |||
| + | == Why it no longer works == |
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| + | There are two reasons that it no longer works |
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| + | |||
| + | === Booting === |
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| + | In firmware 2.0 beta 4 and beyond, [[iBoot]] no longer allows you to pass boot-args to the kernel, so you cannot boot to the new partition. |
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| + | |||
| + | === lstat(); === |
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| + | The "check_for_suspicious_partitions" routine now uses lstat(); instead of stat(); meaning that the method for defeating the 1.1.1+ countermeasure no longer works. I am not sure when Apple started using lstat(); instead of stat(); |
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| + | ==External links== |
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| + | * [http://wikee.iphwn.org/s5l8900:dualboot Full writeup on the dev team wiki] |
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| + | * [http://wikee.iphwn.org/s5l8900:dualboot_logfile Logfile of session creating dual boot system] |
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[[Category:Jailbreaks]] |
[[Category:Jailbreaks]] |
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[[Category:Exploits]] |
[[Category:Exploits]] |
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| + | [[Category:Jailbreaking]] |
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Latest revision as of 12:28, 22 January 2016
Contents
Credit
Exploit
The user would create a copy of the currently installed jailbroken OS to /dev/disk0s3, then in iTunes update to the latest unjailbroken firmware. They would then boot to the jailbroken OS, SSH in, and mount /dev/disk0s1, where the unjailbroken OS was. Finally, they would copy over Installer / OpenSSH / Terminal to the unjailbroken OS.
Defeating Countermeasures
In 1.1.1, a routine called "check_for_suspicious_partitions()" came about, in which for any partition other than the System partition (/dev/disk0s1), it would stat(); "/sbin/launchd" to check the existance of the file. The iPhone Dev Team got around this by simply making /sbin/launchd a symlink to the actual launchd in /mysbin/launchd. Since stat(); does not follow symlinks, this workaround worked great.
Why it no longer works
There are two reasons that it no longer works
Booting
In firmware 2.0 beta 4 and beyond, iBoot no longer allows you to pass boot-args to the kernel, so you cannot boot to the new partition.
lstat();
The "check_for_suspicious_partitions" routine now uses lstat(); instead of stat(); meaning that the method for defeating the 1.1.1+ countermeasure no longer works. I am not sure when Apple started using lstat(); instead of stat();
