This is a kernel module that disables write protection on the system partition while running the stock kernel.
HTC changed the MMC_MUST_PREVENT_WP_VIOLATION code to make it much harder to crack. I had to redo the module completely, so this is experimental. In the past, it was a simple matter of changing a variable, now we have to replace a function in the kernel so it returns something different, causing the kernel to skip over the write protection code.
It works, but needs more testing before I would recommend including it in ROMs. So far I have not found any problems.
I would caution against loading the module after attempting to make changes to the system partition. It could end up corrupting the filesystem. If the module is loaded at boot, there should be no worries.
This module will probably need to be updated to load with future kernels when they are released.
Sense 4.4.3 (2.22 base):
GPE 4.4.4 (thanks to @italyforever):
Wait for it to be implemented in your favourite ROM
* or *
Copy the module to your device, and type
su insmod /location-where-you-copied-it/wp_mod.ko
April 2, 2014 - wp_mod 4.1
-only return non-existing partition number if called by generic_make_request_checks
-remove exit from module (we don't want to be able to unload it)
-clean up code
March 31, 2014 - wp_mod 4.0
-new method for HTC One m8
Module was compiled against m8 Google Play Edition source. Some symbol CRC checks had to be hexedited in the compiled module to match the stock kernel. Thanks to Michael Coppola for example of function hooking on arm: http://poppopret.org/2013/01/07/sute...6-and-arm/#arm