Relevant changes (commit 2e8761e):
* Add an option to truncate the ME image file
* Add full support for Skylake (ME 11) and following, including
modules removal, truncation informations and partition
relocation
* Add two options to generate a shrinked ME image file and the
corresponding descriptor with a modified flash layout
* Update README.md
* Bug fixes
Also add a link to the usage guide in the Kconfig help.
Change-Id: I690c5d558139f64f38babf3c0988b53834ba8b37
Signed-off-by: Nicola Corna <nicola@corna.info>
Reviewed-on: https://review.coreboot.org/20915
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Relevant changes (commit 250b2ec):
* Fix a bug for ME6 Ignition images.
* Fix signature checking for ME11 and later.
* Add command line arguments.
* Add an option to relocate the FTPR partition to the top of the
ME region, recovering most of the ME region space.
* Print the image minimum size.
* Add write boundary checks, to prevent writes on other regions
in case of bugs.
The new changes have been tested on multiple platforms by the
me_cleaner users. They have been tested also on the author's
X220T with coreboot, where the ME region has been shrinked up to
84 kB without any issue.
Change-Id: I3bd6b4cba9f5eebc3cd4892dd9f188744a06c42b
Signed-off-by: Nicola Corna <nicola@corna.info>
Reviewed-on: https://review.coreboot.org/18473
Tested-by: build bot (Jenkins)
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
me_cleaner is a tool to strip down Intel ME/TXE images by removing all
the non-fundamental code, while keeping the ME/TXE image valid and
suitable for booting the system. The remaining code (ROMP and BUP
modules) is the one responsible for the very basic initialization of
the ME/TXE subsystem and can't be removed.
This tool exploits the fact that:
* Each ME/TXE partition is signed individually and it is possible to
remove both the partition and the signature.
* The ME/TXE modules are not signed directly, instead they are hashed
and the list of their hashes is hashed again and signed: this
means that modifying a module doesn't invalidate the signature,
but only the hash of that single module.
* The modules hashes are checked only when the corresponding module
needs to be executed.
* The system can boot after the execution of the first module (BUP,
inside the FTPR partition), even if the subsequent stages fail.
Currently me_cleaner works on every Intel platform with Intel ME or
Intel TXE with the following limitations:
* Doesn't work when Intel Boot Guard is set in Verified Boot mode.
* Doesn't fully work on Nehalem yet.
* On Skylake and later generations, since the partitions' internal
structure has changed, me_cleaner leaves intact the FTPR
partition, removing all the the other partitions.
This tool has been tested on multiple platforms and architectures by
different users, and seems to be stable. The reports are available
here:
https://github.com/corna/me_cleaner/issues/3
A more in-depth description of me_cleaner is available here:
https://github.com/corna/me_cleaner/wiki/How-does-it-work%3F
Change-Id: I9013799e9adea0dea0775b9afe718de5fc4ca748
Signed-off-by: Nicola Corna <nicola@corna.info>
Reviewed-on: https://review.coreboot.org/18203
Tested-by: build bot (Jenkins)
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Nicola Corna