Adrian Reber
75b8c3eff1
tpm2_parse_luks2_json() only insists on "tpm2_pubkey" being present when "tpm2_pubkey_pcrs" is set, but happily accepts a token carrying "tpm2_pubkey_ref" without a public key. tpm2_unseal() then trips over its assert(!pubkey_policy_ref || iovec_is_set(pubkey)), i.e. a crafted LUKS2 header aborts whatever tries to unlock it instead of being rejected. tpm2_make_luks2_json() never writes that combination (it asserts the same invariant), hence refuse it when parsing, as is already done for a PCR mask without a public key. This matters more now that systemd-dissect, systemd-nspawn and systemd-sysext unlock images via these tokens, as the headers they see are less trusted than the host's own volumes. (cherry picked from commit 3520b44f7e398f924c267ee4527941924297c6bc)
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