From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thiebaud Weksteen Subject: [PATCH 2/2] tpm: surface TPM event log based on EFI table Date: Wed, 6 Sep 2017 16:25:02 +0200 Message-ID: <20170906142502.11783-2-tweek@google.com> References: <20170906142502.11783-1-tweek@google.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Return-path: In-Reply-To: <20170906142502.11783-1-tweek-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org> Sender: linux-efi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: matt-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, mjg59-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, peterhuewe-Mmb7MZpHnFY@public.gmane.org, Thiebaud Weksteen List-Id: tpmdd-devel@lists.sourceforge.net Signed-off-by: Thiebaud Weksteen --- drivers/char/tpm/Makefile | 2 +- drivers/char/tpm/tpm.h | 8 +++++ drivers/char/tpm/tpm1_eventlog.c | 16 +++++++--- drivers/char/tpm/tpm_efi.c | 66 ++++++++++++++++++++++++++++++++++++++++ drivers/char/tpm/tpm_eventlog.h | 1 - drivers/firmware/efi/efi.c | 2 ++ include/linux/efi.h | 1 + 7 files changed, 90 insertions(+), 6 deletions(-) create mode 100644 drivers/char/tpm/tpm_efi.c diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile index 23681f01f95a..74182a63eef2 100644 --- a/drivers/char/tpm/Makefile +++ b/drivers/char/tpm/Makefile @@ -4,7 +4,7 @@ obj-$(CONFIG_TCG_TPM) += tpm.o tpm-y := tpm-interface.o tpm-dev.o tpm-sysfs.o tpm-chip.o tpm2-cmd.o \ tpm-dev-common.o tpmrm-dev.o tpm1_eventlog.o tpm2_eventlog.o \ - tpm2-space.o + tpm2-space.o tpm_efi.o tpm-$(CONFIG_ACPI) += tpm_ppi.o tpm_acpi.o tpm-$(CONFIG_OF) += tpm_of.o obj-$(CONFIG_TCG_TIS_CORE) += tpm_tis_core.o diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index efede7dc9340..8858b6467c0d 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -597,6 +597,14 @@ static inline int tpm_read_log_of(struct tpm_chip *chip) return -ENODEV; } #endif +#if defined(CONFIG_EFI) +int tpm_read_log_efi(struct tpm_chip *chip); +#else +static inline int tpm_read_log_efi(struct tpm_chip *chip) +{ + return -ENODEV; +} +#endif int tpm_bios_log_setup(struct tpm_chip *chip); void tpm_bios_log_teardown(struct tpm_chip *chip); diff --git a/drivers/char/tpm/tpm1_eventlog.c b/drivers/char/tpm/tpm1_eventlog.c index 9a8605e500b5..c7d9b10de97f 100644 --- a/drivers/char/tpm/tpm1_eventlog.c +++ b/drivers/char/tpm/tpm1_eventlog.c @@ -21,6 +21,7 @@ */ #include +#include #include #include #include @@ -368,6 +369,10 @@ static int tpm_read_log(struct tpm_chip *chip) } rc = tpm_read_log_acpi(chip); + if (rc != -ENODEV && rc != -EIO) + return rc; + + rc = tpm_read_log_efi(chip); if (rc != -ENODEV) return rc; @@ -388,11 +393,13 @@ int tpm_bios_log_setup(struct tpm_chip *chip) { const char *name = dev_name(&chip->dev); unsigned int cnt; - int rc = 0; + int rc = 0, log_version; + rc = tpm_read_log(chip); - if (rc) + if (rc < 0) return rc; + log_version = rc; cnt = 0; chip->bios_dir[cnt] = securityfs_create_dir(name, NULL); @@ -404,14 +411,15 @@ int tpm_bios_log_setup(struct tpm_chip *chip) cnt++; chip->bin_log_seqops.chip = chip; - if (chip->flags & TPM_CHIP_FLAG_TPM2) + + if (log_version == EFI_TCG2_EVENT_LOG_FORMAT_TCG_2 || + (!log_version && (chip->flags & TPM_CHIP_FLAG_TPM2))) chip->bin_log_seqops.seqops = &tpm2_binary_b_measurements_seqops; else chip->bin_log_seqops.seqops = &tpm_binary_b_measurements_seqops; - chip->bios_dir[cnt] = securityfs_create_file("binary_bios_measurements", 0440, chip->bios_dir[0], diff --git a/drivers/char/tpm/tpm_efi.c b/drivers/char/tpm/tpm_efi.c new file mode 100644 index 000000000000..0ff070e5b4df --- /dev/null +++ b/drivers/char/tpm/tpm_efi.c @@ -0,0 +1,66 @@ +/* + * Copyright (C) 2017 Google + * + * Authors: + * Thiebaud Weksteen + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + */ + +#include + +#include "tpm.h" +#include "tpm_eventlog.h" + + +/* read binary bios log from EFI configuration table */ +int tpm_read_log_efi(struct tpm_chip *chip) +{ + + struct linux_efi_tpm_eventlog *log_tbl; + struct tpm_bios_log *log; + u32 log_size; + u8 tpm_log_version; + + if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) + return -ENODEV; + + if (efi.tpm_log == EFI_INVALID_TABLE_ADDR) + return -ENODEV; + + log = &chip->log; + + log_tbl = ioremap(efi.tpm_log, sizeof(*log_tbl)); + if (!log_tbl) { + pr_err("Could not map UEFI TPM log table !\n"); + return -ENOMEM; + } + + log_size = log_tbl->size; + iounmap(log_tbl); + + log_tbl = ioremap(efi.tpm_log, sizeof(*log_tbl) + log_size); + if (!log_tbl) { + pr_err("Could not map UEFI TPM log table payload!\n"); + return -ENOMEM; + } + + /* malloc EventLog space */ + log->bios_event_log = kmalloc(log_size, GFP_KERNEL); + if (!log->bios_event_log) + goto err_iounmap; + memcpy(log->bios_event_log, log_tbl->log, log_size); + log->bios_event_log_end = log->bios_event_log + log_size; + + tpm_log_version = log_tbl->version; + iounmap(log_tbl); + return tpm_log_version; + +err_iounmap: + iounmap(log_tbl); + return -ENOMEM; +} diff --git a/drivers/char/tpm/tpm_eventlog.h b/drivers/char/tpm/tpm_eventlog.h index 1009a2503985..9144a8707d70 100644 --- a/drivers/char/tpm/tpm_eventlog.h +++ b/drivers/char/tpm/tpm_eventlog.h @@ -117,5 +117,4 @@ struct tcg_pcr_event2 { struct tcg_event_field event; } __packed; - #endif diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index f97f272e16ee..886f67f7519e 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -52,6 +52,7 @@ struct efi __read_mostly efi = { .properties_table = EFI_INVALID_TABLE_ADDR, .mem_attr_table = EFI_INVALID_TABLE_ADDR, .rng_seed = EFI_INVALID_TABLE_ADDR, + .tpm_log = EFI_INVALID_TABLE_ADDR }; EXPORT_SYMBOL(efi); @@ -444,6 +445,7 @@ static __initdata efi_config_table_type_t common_tables[] = { {EFI_PROPERTIES_TABLE_GUID, "PROP", &efi.properties_table}, {EFI_MEMORY_ATTRIBUTES_TABLE_GUID, "MEMATTR", &efi.mem_attr_table}, {LINUX_EFI_RANDOM_SEED_TABLE_GUID, "RNG", &efi.rng_seed}, + {LINUX_EFI_TPM_EVENT_LOG_GUID, "TPMEventLog", &efi.tpm_log}, {NULL_GUID, NULL, NULL}, }; diff --git a/include/linux/efi.h b/include/linux/efi.h index 5eaaa68ac58a..277a2347fa34 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -930,6 +930,7 @@ extern struct efi { unsigned long properties_table; /* properties table */ unsigned long mem_attr_table; /* memory attributes table */ unsigned long rng_seed; /* UEFI firmware random seed */ + unsigned long tpm_log; /* TPM2 Event Log table */ efi_get_time_t *get_time; efi_set_time_t *set_time; efi_get_wakeup_time_t *get_wakeup_time; -- 2.14.1.581.gf28d330327-goog