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I understand that Intel TXT provides a Dynamic Root of Trust Measurement (DRTM). Does the Linux integrity measurement architecture do logically similar things? If not, what are the differences?

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No, they are complementary.

DRTM provides a Root of Trust on which you can build applications/use-cases such as Integrity measurement of your entire linux system (IMA). However, it is not part of it.

I think the simplest way to explain this is with the following:

  • IMA needs the kernel to evaluate the integrity of the system (e.g. userland);
  • DRTM (or SRTM for this matter) can validate the integrity of the kernel itself. See tboot.

I suggest reading this to have a feel for it - the "Value Proposition for Linux" more precisely.

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