DRAFT : Proposed kernel configuration improvements to enhance security #1816
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aluciani
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…atch for qemu board Before commiting changes here, take nv41 linux config changes and save into patch file: git diff > patch Signed-off-by: Thierry Laurion <[email protected]>
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…g but flashrom Apply previous patch: patch config/linux-qemu.config patch Apply changes: docker run -e DISPLAY=$DISPLAY --network host --rm -ti -v $(pwd):$(pwd) -w $(pwd) tlaurion/heads-dev-env:latest -- make BOARD=qemu-coreboot-whiptail-tpm1 linux.modify_and_save_oldconfig_in_place Review changes, build: docker run -e DISPLAY=$DISPLAY --network host --rm -ti -v $(pwd):$(pwd) -w $(pwd) tlaurion/heads-dev-env:latest -- make BOARD=qemu-coreboot-whiptail-tpm1 Run: docker run -e DISPLAY=$DISPLAY --network host --rm -ti -v $(pwd):$(pwd) -w $(pwd) tlaurion/heads-dev-env:latest -- make BOARD=qemu-coreboot-whiptail-tpm1 run Signed-off-by: Thierry Laurion <[email protected]>
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@aluciani as noted under CI, commits unsigned fail CI at https://github.com/linuxboot/heads/pull/1816/checks?check_run_id=31787361888 |
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@aluciani this is nice exercise. Wondering if https://github.com/a13xp0p0v/kernel-hardening-checker should be added under nix docker image and some self-test should be added in CI in long term to make those checks automatic and warn of security regressions, somehow. Note that final change on nv41 linux config file can be observed directly under https://github.com/linuxboot/heads/pull/1817/files#diff-782b88c1e0e03988fb8336bd99c65310869be9f3c1e3a88a1be57bcd5ab7c4e8 |
Signed-off-by: Antoine Luciani <[email protected]>
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I was looking at heads' kernel config (for nitropad-nv41 in my case), and I thought there might be some options that would be worth changing (“y”->“is not set”, “is not set”->“y” and some literal values).
This idea comes to me from a13xp0p0v's project kernel-hardening-checker, which aims to verify the security of a linux kernel. It's true that this project is more for server or desktop linux, but I think some options could be useful in the case of head.
I'm talking about the following options:
From "y" to "is not set" :
From to "is not set" to "y" :
Literal values :
Please note that some options are changed automatically, but only after running the command “make BOARD=nitropad-nv41 linux.prompt_for_new_config_options_for_kernel_version_bump”.
This is a draft, so I haven't checked whether it's really a problem to change the GCC version, etc, at the moment.
I'm adding a mod.md file here, which lists all the modules and linux CONFIGs required for traceability.
obviously DO NOT merge