^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2016 IBM Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Authors:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Nayna Jain <nayna@linux.vnet.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Access to TPM 2.0 event log as written by Firmware.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * It assumes that writer of event log has followed TCG Specification
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * for Family "2.0" and written the event data in little endian.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * With that, it doesn't need any endian conversion for structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * content.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/tpm_eventlog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include "../tpm.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include "common.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * calc_tpm2_event_size() - calculate the event size, where event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * is an entry in the TPM 2.0 event log. The event is of type Crypto
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * Agile Log Entry Format as defined in TCG EFI Protocol Specification
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * Family "2.0".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * @event: event whose size is to be calculated.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * @event_header: the first event in the event log.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * Returns size of the event. If it is an invalid event, returns 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static size_t calc_tpm2_event_size(struct tcg_pcr_event2_head *event,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct tcg_pcr_event *event_header)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) return __calc_tpm2_event_size(event, event_header, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static void *tpm2_bios_measurements_start(struct seq_file *m, loff_t *pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct tpm_chip *chip = m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct tpm_bios_log *log = &chip->log;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) void *addr = log->bios_event_log;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) void *limit = log->bios_event_log_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) struct tcg_pcr_event *event_header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct tcg_pcr_event2_head *event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) size_t size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) event_header = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) size = struct_size(event_header, event, event_header->event_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (*pos == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) if (addr + size < limit) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if ((event_header->event_type == 0) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) (event_header->event_size == 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return SEQ_START_TOKEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) if (*pos > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) addr += size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) event = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) size = calc_tpm2_event_size(event, event_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if ((addr + size >= limit) || (size == 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) for (i = 0; i < (*pos - 1); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) event = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) size = calc_tpm2_event_size(event, event_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if ((addr + size >= limit) || (size == 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) addr += size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) static void *tpm2_bios_measurements_next(struct seq_file *m, void *v,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) loff_t *pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) struct tcg_pcr_event *event_header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) struct tcg_pcr_event2_head *event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) struct tpm_chip *chip = m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) struct tpm_bios_log *log = &chip->log;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) void *limit = log->bios_event_log_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) size_t event_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) void *marker;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) (*pos)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) event_header = log->bios_event_log;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (v == SEQ_START_TOKEN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) event_size = struct_size(event_header, event,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) event_header->event_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) marker = event_header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) event = v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) event_size = calc_tpm2_event_size(event, event_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (event_size == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) marker = event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) marker = marker + event_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (marker >= limit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) v = marker;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) event = v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) event_size = calc_tpm2_event_size(event, event_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (((v + event_size) >= limit) || (event_size == 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static void tpm2_bios_measurements_stop(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static int tpm2_binary_bios_measurements_show(struct seq_file *m, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) struct tpm_chip *chip = m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) struct tpm_bios_log *log = &chip->log;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) struct tcg_pcr_event *event_header = log->bios_event_log;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) struct tcg_pcr_event2_head *event = v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) void *temp_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) size_t size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (v == SEQ_START_TOKEN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) size = struct_size(event_header, event,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) event_header->event_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) temp_ptr = event_header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (size > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) seq_write(m, temp_ptr, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) size = calc_tpm2_event_size(event, event_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) temp_ptr = event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (size > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) seq_write(m, temp_ptr, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) const struct seq_operations tpm2_binary_b_measurements_seqops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) .start = tpm2_bios_measurements_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) .next = tpm2_bios_measurements_next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) .stop = tpm2_bios_measurements_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) .show = tpm2_binary_bios_measurements_show,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) };
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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