kernel-5.15: disable IMA and SafeSetID LSM #2789
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The integrity measurement architecture is a kernel feature to allow for runtime integrity checking of files. As the file system is immutable in Bottlerocket and we are doing boot time integrity checking there is no real use for IMA. Signed-off-by: Leonard Foerster <[email protected]>
We do not grant CAP_SETUID of CAP_SETGID to any of the users we have on the host system. Using this LSM to controll uid/gid transitions in a finer grained way is not useful for our use case. Signed-off-by: Leonard Foerster <[email protected]>
stmcginnis
approved these changes
Feb 9, 2023
markusboehme
approved these changes
Feb 9, 2023
arnaldo2792
approved these changes
Feb 9, 2023
This was referenced Feb 10, 2023
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Issue number:
Closes # #2708 #2707
Description of changes:
As a fallout of the latest kernel updates we inherited some additional hardening features. Evaluating both of these features (IMA, SafeSetID LSM) we identified them as not applicable in a meaningful way in Bottlerocket. Hence, disable them to keep our kernel as lean as possible.
Testing done:
With disabling IMA we also remove a bunch of IMA sub-configurations that are not reachable anymore. We do not remove any unwanted options:
A full config diff for all versions can be found in this gist.
Running the a test build locally in qemu worked as expected.
Terms of contribution:
By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.