From bedbef8ad3e75a304af6361af235302bcc61d06b Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 14 May 2024 06:39:01 +0000
Subject: [PATCH] 修改内核路径
---
kernel/include/linux/tpm_eventlog.h | 206 +++++++++++++++++++++++++++++++++++++++++++++++----
1 files changed, 188 insertions(+), 18 deletions(-)
diff --git a/kernel/include/linux/tpm_eventlog.h b/kernel/include/linux/tpm_eventlog.h
index 20d9da7..7d68a5c 100644
--- a/kernel/include/linux/tpm_eventlog.h
+++ b/kernel/include/linux/tpm_eventlog.h
@@ -3,12 +3,11 @@
#ifndef __LINUX_TPM_EVENTLOG_H__
#define __LINUX_TPM_EVENTLOG_H__
-#include <crypto/hash_info.h>
+#include <linux/tpm.h>
#define TCG_EVENT_NAME_LEN_MAX 255
#define MAX_TEXT_EVENT 1000 /* Max event string length */
#define ACPI_TCPA_SIG "TCPA" /* 0x41504354 /'TCPA' */
-#define TPM2_ACTIVE_PCR_BANKS 3
#define EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2 0x1
#define EFI_TCG2_EVENT_LOG_FORMAT_TCG_2 0x2
@@ -29,7 +28,7 @@
u32 event_type;
u8 pcr_value[20]; /* SHA1 */
u32 event_size;
- u8 event_data[0];
+ u8 event_data[];
};
enum tcpa_event_types {
@@ -56,7 +55,7 @@
struct tcpa_pc_event {
u32 event_id;
u32 event_size;
- u8 event_data[0];
+ u8 event_data[];
};
enum tcpa_pc_event_ids {
@@ -82,7 +81,9 @@
u16 digest_size;
} __packed;
-struct tcg_efi_specid_event {
+#define TCG_SPECID_SIG "Spec ID Event03"
+
+struct tcg_efi_specid_event_head {
u8 signature[16];
u32 platform_class;
u8 spec_version_minor;
@@ -90,9 +91,7 @@
u8 spec_errata;
u8 uintnsize;
u32 num_algs;
- struct tcg_efi_specid_event_algs digest_sizes[TPM2_ACTIVE_PCR_BANKS];
- u8 vendor_info_size;
- u8 vendor_info[0];
+ struct tcg_efi_specid_event_algs digest_sizes[];
} __packed;
struct tcg_pcr_event {
@@ -100,25 +99,196 @@
u32 event_type;
u8 digest[20];
u32 event_size;
- u8 event[0];
+ u8 event[];
} __packed;
struct tcg_event_field {
u32 event_size;
- u8 event[0];
+ u8 event[];
} __packed;
-struct tpm2_digest {
- u16 alg_id;
- u8 digest[SHA512_DIGEST_SIZE];
-} __packed;
-
-struct tcg_pcr_event2 {
+struct tcg_pcr_event2_head {
u32 pcr_idx;
u32 event_type;
u32 count;
- struct tpm2_digest digests[TPM2_ACTIVE_PCR_BANKS];
- struct tcg_event_field event;
+ struct tpm_digest digests[];
} __packed;
+struct tcg_algorithm_size {
+ u16 algorithm_id;
+ u16 algorithm_size;
+};
+
+struct tcg_algorithm_info {
+ u8 signature[16];
+ u32 platform_class;
+ u8 spec_version_minor;
+ u8 spec_version_major;
+ u8 spec_errata;
+ u8 uintn_size;
+ u32 number_of_algorithms;
+ struct tcg_algorithm_size digest_sizes[];
+};
+
+#ifndef TPM_MEMREMAP
+#define TPM_MEMREMAP(start, size) NULL
+#endif
+
+#ifndef TPM_MEMUNMAP
+#define TPM_MEMUNMAP(start, size) do{} while(0)
+#endif
+
+/**
+ * __calc_tpm2_event_size - calculate the size of a TPM2 event log entry
+ * @event: Pointer to the event whose size should be calculated
+ * @event_header: Pointer to the initial event containing the digest lengths
+ * @do_mapping: Whether or not the event needs to be mapped
+ *
+ * The TPM2 event log format can contain multiple digests corresponding to
+ * separate PCR banks, and also contains a variable length of the data that
+ * was measured. This requires knowledge of how long each digest type is,
+ * and this information is contained within the first event in the log.
+ *
+ * We calculate the length by examining the number of events, and then looking
+ * at each event in turn to determine how much space is used for events in
+ * total. Once we've done this we know the offset of the data length field,
+ * and can calculate the total size of the event.
+ *
+ * Return: size of the event on success, 0 on failure
+ */
+
+static __always_inline int __calc_tpm2_event_size(struct tcg_pcr_event2_head *event,
+ struct tcg_pcr_event *event_header,
+ bool do_mapping)
+{
+ struct tcg_efi_specid_event_head *efispecid;
+ struct tcg_event_field *event_field;
+ void *mapping = NULL;
+ int mapping_size;
+ void *marker;
+ void *marker_start;
+ u32 halg_size;
+ size_t size;
+ u16 halg;
+ int i;
+ int j;
+ u32 count, event_type;
+ const u8 zero_digest[sizeof(event_header->digest)] = {0};
+
+ marker = event;
+ marker_start = marker;
+ marker = marker + sizeof(event->pcr_idx) + sizeof(event->event_type)
+ + sizeof(event->count);
+
+ /* Map the event header */
+ if (do_mapping) {
+ mapping_size = marker - marker_start;
+ mapping = TPM_MEMREMAP((unsigned long)marker_start,
+ mapping_size);
+ if (!mapping) {
+ size = 0;
+ goto out;
+ }
+ } else {
+ mapping = marker_start;
+ }
+
+ event = (struct tcg_pcr_event2_head *)mapping;
+ /*
+ * The loop below will unmap these fields if the log is larger than
+ * one page, so save them here for reference:
+ */
+ count = event->count;
+ event_type = event->event_type;
+
+ /* Verify that it's the log header */
+ if (event_header->pcr_idx != 0 ||
+ event_header->event_type != NO_ACTION ||
+ memcmp(event_header->digest, zero_digest, sizeof(zero_digest))) {
+ size = 0;
+ goto out;
+ }
+
+ efispecid = (struct tcg_efi_specid_event_head *)event_header->event;
+
+ /*
+ * Perform validation of the event in order to identify malformed
+ * events. This function may be asked to parse arbitrary byte sequences
+ * immediately following a valid event log. The caller expects this
+ * function to recognize that the byte sequence is not a valid event
+ * and to return an event size of 0.
+ */
+ if (memcmp(efispecid->signature, TCG_SPECID_SIG,
+ sizeof(TCG_SPECID_SIG)) ||
+ !efispecid->num_algs || count != efispecid->num_algs) {
+ size = 0;
+ goto out;
+ }
+
+ for (i = 0; i < count; i++) {
+ halg_size = sizeof(event->digests[i].alg_id);
+
+ /* Map the digest's algorithm identifier */
+ if (do_mapping) {
+ TPM_MEMUNMAP(mapping, mapping_size);
+ mapping_size = halg_size;
+ mapping = TPM_MEMREMAP((unsigned long)marker,
+ mapping_size);
+ if (!mapping) {
+ size = 0;
+ goto out;
+ }
+ } else {
+ mapping = marker;
+ }
+
+ memcpy(&halg, mapping, halg_size);
+ marker = marker + halg_size;
+
+ for (j = 0; j < efispecid->num_algs; j++) {
+ if (halg == efispecid->digest_sizes[j].alg_id) {
+ marker +=
+ efispecid->digest_sizes[j].digest_size;
+ break;
+ }
+ }
+ /* Algorithm without known length. Such event is unparseable. */
+ if (j == efispecid->num_algs) {
+ size = 0;
+ goto out;
+ }
+ }
+
+ /*
+ * Map the event size - we don't read from the event itself, so
+ * we don't need to map it
+ */
+ if (do_mapping) {
+ TPM_MEMUNMAP(mapping, mapping_size);
+ mapping_size += sizeof(event_field->event_size);
+ mapping = TPM_MEMREMAP((unsigned long)marker,
+ mapping_size);
+ if (!mapping) {
+ size = 0;
+ goto out;
+ }
+ } else {
+ mapping = marker;
+ }
+
+ event_field = (struct tcg_event_field *)mapping;
+
+ marker = marker + sizeof(event_field->event_size)
+ + event_field->event_size;
+ size = marker - marker_start;
+
+ if (event_type == 0 && event_field->event_size == 0)
+ size = 0;
+
+out:
+ if (do_mapping)
+ TPM_MEMUNMAP(mapping, mapping_size);
+ return size;
+}
+
#endif
--
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