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Here are some facts about OS X's kernel extensions kexts that I've managed to aggregate. Normally, whole directory that contains the kext must be owned by the root: If it's not, you will get errors during loading phase of the kext. Additionally, your kext must be writable by root only. If it's not, you will get loading errors! Be aware that you need to use the -R option when performing the chmod command.
This means that you need to fix the privileges for all the files and directories inside the kext bundle. You can dynamically check for conformance to these rules by using the kextutil tool to load your kext you can also examine the -tn -- test and do not load -- option. It's usage is the same as kextload , so I assume you won't have any problems here. When writing a new kernel extension it is often a good idea to test it on multiple systems. Fastest way for the developer to perform such tests is to use multiple virtual machines, where each machine is controlled by a different version of the operating system.
Different versions of MacOS X have different policies when it comes to loading thirdparty i. It is sane to assume that you can't codesign each compilation of your kext, so it's important to know if a system will allow loading unsigned kexts or not.
Digitally signed kexts are not allowed. Yes, they're not supported. If you digitally sign a kext file by using an embedded digital sign inside the main kext MachO binary file, the system will refuse to load your kext.
So, as far as development requirements goes, you're good to go already! Respects codesign, but not enforces it. If your kext is not digitally signed, it still can be loaded at least by using the kextload utility. The system can emit a warning with a message that it can't verify the origin of your kext, but it will load it anyway.
If you're OK with this message, you're good to go, as a developer. But there's a small catch: If it's not signed, it will not load. Complete enforcement of codesign. Your kext will not be loaded if it's not digitally signed. As a developer, you're screwed. If you're doing your development on a VM, you can force your system to disable checking of digital signs of every kext.
Important thing to note is that it will literally disable the digital sign checking code across the whole system, so don't do it on the computers of your clients! Please be aware that you need to append this option to your existing boot-args, not overwrite those args who knows what's in there.
Also, nvram doesn't work in VirtualBox. If you're using VirtualBox, try this command on your host machine:. If you're using a Hackintosh virtual machine inside VirtualBox that doesn't use EFI not that I'm using it , and you still can't get it to work, you can also try this one:. Like Yosemite, complete enforcement of codesign.
However, there is a twist: El Capitan introduced something that is called System Integrity Protection, which seems to wrap up some things that were previously used by codesign subsystem alone. At the time of writing this post, El Capitan is still not fully released, so the method below can change, but it seems that SIP can be disabled by following these steps:. Enter the Security Configuration option, which can be found inside Utilities menu,. Theoretically, it should work. However, if you're using VirtualBox, this won't work.
You can't simply "enter recovery OS". Instead, you will want to enter "installation OS", or whatever the name is. Follow this article in order to find out how to do it. Apple suggests that if you would want to retain backward compatibility before Mountain Lion release OS X versions before Mavericks It appears that you can also use a different technique of codesigning of a kext by embedding an external digital sign.
To do this, examine the --no-macho option of codesign utility. The problem is that older dynamic linkers in older OS X versions can't handle this load command, only new ones can handle it. By placing it outside of the kext binary, you won't confuse older linkers with an unknown load command.
Installation basics Normally, whole directory that contains the kext must be owned by the root: Development deployment When writing a new kernel extension it is often a good idea to test it on multiple systems. Please restart the machine for changes to take effect. Categories hack misc programming sysop. Feeds atom feed rss feed. This blog was generated by Pelican using a slightly modified Pujangga theme.