Heh, autocorrect is useful... That should say prelinked kernel and not prelim led, Evan On Aug 24, 2012, at 1:16 PM, Evan Lojewski <meklort@gmail.com> wrote:

I think a good question to ask here is *why* you want to do an integrity check. Do you just want to make sure that the Kext hasn't been corrupted? Additionally, if the Kext is loading from a prelim led kernel or cache, the binary itself may get modified.

Evan Lojewski

On Aug 24, 2012, at 1:08 PM, Ken Hornstein <kenh@cmf.nrl.navy.mil> wrote:

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You seem to be drawing conclusions based on writing a BSD filesystem kext (?) which is not the general case, and certainly has a different operating environment than 99% of kexts (which are IOKit kexts, match asynchronously with respect to the root filesystem and each other, and cannot in general call into the BSD side of the kernel early in boot without panicking)

Well, yeah, that's my experience, and I hope I've never presented myself as the be-all expert when it comes to MacOS kernel extensions because obviously I'm not.

My original point was that you can definitely access filesystems from kexts, but I was under the impression that kext loading was handled exclusively by kextd and friends and obviously everything will be up and running by that time. As you've pointed out, that's not a valid assumption; I learned something new today.

It occurs to me that if your kext is loaded before the root filesystem is mounted you could do somet goofy stuff like have a thread wait around until it is available, but that probably falls under "here be dragons".

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