1 files changed, 48 insertions, 0 deletions
diff --git a/src/fundamental/tpm-pcr.h b/src/fundamental/tpm-pcr.h
new file mode 100644
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--- /dev/null
+++ b/src/fundamental/tpm-pcr.h
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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include "macro-fundamental.h"
+
+/* The various TPM PCRs we measure into from sd-stub and sd-boot. */
+
+/* This TPM PCR is where we extend the sd-stub "payloads" into, before using them. i.e. the kernel ELF image,
+ * embedded initrd, and so on. In contrast to PCR 4 (which also contains this data, given the whole
+ * surrounding PE image is measured into it) this should be reasonably pre-calculatable, because it *only*
+ * consists of static data from the kernel PE image. */
+#define TPM_PCR_INDEX_KERNEL_IMAGE 11U
+
+/* This TPM PCR is where sd-stub extends the kernel command line and any passed credentials into. */
+#define TPM_PCR_INDEX_KERNEL_PARAMETERS 12U
+
+/* sd-stub used to write the kernel command line/credentials into PCR 8, in systemd <= 250. Let's provide for
+ * some compatibility. (Remove in 2023!) */
+#if EFI_TPM_PCR_COMPAT
+#define TPM_PCR_INDEX_KERNEL_PARAMETERS_COMPAT 8U
+#else
+#define TPM_PCR_INDEX_KERNEL_PARAMETERS_COMPAT UINT32_MAX
+#endif
+
+/* This TPM PCR is where we extend the initrd sysext images into which we pass to the booted kernel */
+#define TPM_PCR_INDEX_INITRD_SYSEXTS 13U
+
+/* List of PE sections that have special meaning for us in unified kernels. This is the canonical order in
+ * which we measure the sections into TPM PCR 11 (see above). PLEASE DO NOT REORDER! */
+typedef enum UnifiedSection {
+        UNIFIED_SECTION_LINUX,
+        UNIFIED_SECTION_OSREL,
+        UNIFIED_SECTION_CMDLINE,
+        UNIFIED_SECTION_INITRD,
+        UNIFIED_SECTION_SPLASH,
+        UNIFIED_SECTION_DTB,
+        UNIFIED_SECTION_PCRSIG,
+        UNIFIED_SECTION_PCRPKEY,
+        _UNIFIED_SECTION_MAX,
+} UnifiedSection;
+
+extern const char* const unified_sections[_UNIFIED_SECTION_MAX + 1];
+
+static inline bool unified_section_measure(UnifiedSection section) {
+        /* Don't include the PCR signature in the PCR measurements, since they sign the expected result of
+         * the measurement, and hence shouldn't be input to it. */
+        return section >= 0 && section < _UNIFIED_SECTION_MAX && section != UNIFIED_SECTION_PCRSIG;
+}