Alberto Planas
2d54e6b56e
So far tpm2_unseal() used -EUCLEAN together with the errors that signal that the PCR state does not match the policy. That is misleading: -EUCLEAN (and TPM2_RC_PCR_CHANGED) is only ever generated when the TPM's global PCR update counter moves while we are building the policy or unsealing, i.e. when something on the system extends a PCR concurrentlyi (usually IMA extending PCR 10). It says nothing about whether the policy itself matches. Until now the retry loop only recognized those conditions while retries were left (i > 0), and once the budget was exhausted the last iteration fell through to the generic paths, reporting either an unrelated policy error or -ENOTRECOVERABLE. Handle the last iteration explicitly instead, and return -EUCLEAN with a message that names the actual problem. Drop -EUCLEAN from ERRNO_IS_NEG_TPM2_UNSEAL_BAD_PCR(), it is not a "bad PCR state" error. Signed-off-by: Alberto Planas <aplanas@suse.com>
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