ios-kernel-patch/README

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git clone git@github.com:comex/datautils0.git
cd datautils0
git clone git@github.com:comex/data.git
make NATIVE=1
./make_kernel_patchfile /path/to/kernelcache /tmp/patchfile
./apply_patchfile /path/to/kernelcache /tmp/patchfile /output/patched/kernelcache
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Patchfile format:
field length
--------------------
namelen 4
name namelen
addr 4
datalen 4
data datalen
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- If the address is 0, skip.
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- If you're patching the kernel after it has already booted, you can (but need not) skip patches with names starting with "-".
- apply_patchfile patches the kernel to start /sbin/lunchd instead of launchd. You can remove that, but the idea is that the filesystem looks like this:
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/sbin/launchd: an untether exploit that execs /sbin/lunchd; skipped by an already-patched kernel
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/sbin/lunchd: a script that execs /sbin/launchd.real with DYLD_INSERT_LIBRARIES set to the dylibs in /Library/LaunchExtensions; this may be used in the future by MobileSubstrate
/sbin/launchd.real: the original /sbin/launchd
This is the lunchd script:
#!/bin/bash
shopt -s nullglob
dylibs=$(for dylib in /Library/LaunchExtensions/*.dylib; do echo -n "$dylib:"; done)
export DYLD_INSERT_LIBRARIES=${dylibs%:}
exec -a /sbin/launchd /sbin/launchd.real