💊 RedPill LKM

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THIS IS WORK IN PROGRESS

There's nothing to run/see here (yet ;)).

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What is this?

This is a major part of a tool which will be able to run a DSM instance for research purposes without engaging your real DS machine and risking your data in the process (ask me how I know...).

Target audience

This repository is target towards developers willing to learn and help with implementation of peculiarities of Synology's DSM Linux distribution.

Read about the quirk in a separate repo: https://github.com/RedPill-TTG/dsm-research/tree/master/quirks

How to build with Linux sources?

1. You need Synology's GPL sources for the kernel. Check the Makefile for details
2. cd to kernel sources
3. Depending on the version:
   • Linux v3
     • cp synoconfigs/bromolow .config
   • Linux v4
     • cp synoconfigs/apollolake .config
     • echo '+' > .scmversion (otherwise it will error-out loading modules)
4. make oldconfig ; make modules_prepare
5. cd back to the module directory
6. make LINUX_SRC=.... (path to linux sources, default: ../linux-3.10.x-bromolow-25426)
7. You will get a redpill.ko module as the result, you can insmod it

How to build with syno toolkit?

The procedure to build with the toolkit is not recommended. However, some versions lack the kernel sources (e.g. v7 now) and thus can only use this method.

1. Get the appropriate toolkit from the official SF repo
   • You want to get the .dev.txz file for the corresponding platform (e.g. ds.bromolow-7.0.dev.txz)
   • You only need to unpack a part of it: tar -xvf ds.bromolow-7.0.dev.txz usr/local/x86_64-pc-linux-gnu/x86_64-pc-linux-gnu/sys-root/usr/lib/modules/DSM-7.0/build
   • If the path above changed you can use tar -tvf ds.bromolow-7.0.dev.txz | grep kfifo.h to find the correct one
2. cd to the module directory
3. make LINUX_SRC=<toolkit-directory>/usr/local/x86_64-pc-linux-gnu/x86_64-pc-linux-gnu/sys-root/usr/lib/modules/DSM-7.0/build
4. You will get a redpill.ko module as the result, you can insmod it

Additional make options

While calling make you can also add these additional modifiers (e.g. make FOO BAR):

• DBG_EXECVE=y: enabled debugging of every execve() call with arguments
• STEALTH_MODE=#: controls the level of "stealthiness", see STEALTH_MODE_* in internal/stealth.h; it's STEALTH_MODE_BASIC by default
• LINUX_SRC=...: path to the linux kernel sources (./linux-3.10.x-bromolow-25426 by default)

On Debian-based systems you will need build-essential and libssl-dev packages at minimum.

Documentation split

The documentation regarding actual quirks/mechanisms/discoveries regarding DSM is present in a dedicated research repo at https://github.com/RedPill-TTG/dsm-research/. Documentation in this repository is solely aimed to explain implementation details of the kernel module. It will mostly be available in forms of long(ish) doc blocks.