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4e1f0037b8
Distributions apparently only compile a subset of TPM2 drivers into the kernel. For those not compiled it but provided as kmod we need a synchronization point: we must wait before the first TPM2 interaction until the driver is available and accessible. This adds a tpm2.target unit as such a synchronization point. It's ordered after /dev/tpmrm0, and is pulled in by a generator whenever we detect that the kernel reported a TPM2 to exist but we have no device for it yet. This should solve the issue, but might create problems: if there are TPM devices supported by firmware that we don't have Linux drivers for we'll hang for a bit. Hence let's add a kernel cmdline switch to disable (or alternatively force) this logic. Fixes: #30164
26 lines
667 B
SYSTEMD
26 lines
667 B
SYSTEMD
# SPDX-License-Identifier: LGPL-2.1-or-later
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#
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# This file is part of systemd.
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#
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# systemd is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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[Unit]
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Description=TPM2 PCR Extension (Varlink)
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Documentation=man:systemd-pcrextend(8)
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DefaultDependencies=no
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After=tpm2.target
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Before=sockets.target
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ConditionSecurity=measured-uki
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[Socket]
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ListenStream=/run/systemd/io.systemd.PCRExtend
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FileDescriptorName=varlink
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SocketMode=0600
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Accept=yes
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[Install]
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WantedBy=sockets.target
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