^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) 2005 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) * Seiji Munetoh <munetoh@jp.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Stefan Berger <stefanb@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Reiner Sailer <sailer@watson.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Kylene Hall <kjhall@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Nayna Jain <nayna@linux.vnet.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Maintained by: <tpmdd-devel@lists.sourceforge.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Access to the event log extended by the TCG BIOS of PC platform
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/tpm_eventlog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include "../tpm.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include "common.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct acpi_tcpa {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct acpi_table_header hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) u16 platform_class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct client_hdr {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) u32 log_max_len __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) u64 log_start_addr __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) } client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct server_hdr {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) u16 reserved;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) u64 log_max_len __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) u64 log_start_addr __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) } server;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) /* Check that the given log is indeed a TPM2 log. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) static bool tpm_is_tpm2_log(void *bios_event_log, u64 len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct tcg_efi_specid_event_head *efispecid;
^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) int n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if (len < sizeof(*event_header))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) len -= sizeof(*event_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) event_header = bios_event_log;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (len < sizeof(*efispecid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) efispecid = (struct tcg_efi_specid_event_head *)event_header->event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) n = memcmp(efispecid->signature, TCG_SPECID_SIG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) sizeof(TCG_SPECID_SIG));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return n == 0;
^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) /* read binary bios log */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) int tpm_read_log_acpi(struct tpm_chip *chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct acpi_tcpa *buff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) void __iomem *virt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) u64 len, start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) struct tpm_bios_log *log;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct acpi_table_tpm2 *tbl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct acpi_tpm2_phy *tpm2_phy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) int format;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) log = &chip->log;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) /* Unfortuntely ACPI does not associate the event log with a specific
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * TPM, like PPI. Thus all ACPI TPMs will read the same log.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (!chip->acpi_dev_handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (chip->flags & TPM_CHIP_FLAG_TPM2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) status = acpi_get_table("TPM2", 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) (struct acpi_table_header **)&tbl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (ACPI_FAILURE(status))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (tbl->header.length <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) sizeof(*tbl) + sizeof(struct acpi_tpm2_phy))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) tpm2_phy = (void *)tbl + sizeof(*tbl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) len = tpm2_phy->log_area_minimum_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) start = tpm2_phy->log_area_start_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (!start || !len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) format = EFI_TCG2_EVENT_LOG_FORMAT_TCG_2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /* Find TCPA entry in RSDT (ACPI_LOGICAL_ADDRESSING) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) status = acpi_get_table(ACPI_SIG_TCPA, 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) (struct acpi_table_header **)&buff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (ACPI_FAILURE(status))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) switch (buff->platform_class) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) case BIOS_SERVER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) len = buff->server.log_max_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) start = buff->server.log_start_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) case BIOS_CLIENT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) len = buff->client.log_max_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) start = buff->client.log_start_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) format = EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (!len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) dev_warn(&chip->dev, "%s: TCPA log area empty\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) /* malloc EventLog space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) log->bios_event_log = kmalloc(len, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (!log->bios_event_log)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) log->bios_event_log_end = log->bios_event_log + len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) virt = acpi_os_map_iomem(start, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (!virt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) memcpy_fromio(log->bios_event_log, virt, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) acpi_os_unmap_iomem(virt, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (chip->flags & TPM_CHIP_FLAG_TPM2 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) !tpm_is_tpm2_log(log->bios_event_log, len)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) /* try EFI log next */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) return format;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) kfree(log->bios_event_log);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) log->bios_event_log = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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