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author | 2018-01-31 13:12:31 -0800 | |
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committer | 2018-01-31 13:12:31 -0800 | |
commit | ae0cb7be35fe6c7e8bcc816ec4185d0a37748cc1 (patch) | |
tree | 2453151c8d507502ce91c6827f3e8a35e1777996 /drivers/char/tpm/tpm_eventlog_efi.c | |
parent | Merge branch 'next-smack' of git://git.kernel.org/pub/scm/linux/kernel/git/jm... (diff) | |
parent | Merge tag 'tpmdd-next-20180108' of git://git.infradead.org/users/jjs/linux-tp... (diff) | |
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Merge branch 'next-tpm' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security
Pull tpm updates from James Morris:
- reduce polling delays in tpm_tis
- support retrieving TPM 2.0 Event Log through EFI before
ExitBootServices
- replace tpm-rng.c with a hwrng device managed by the driver for each
TPM device
- TPM resource manager synthesizes TPM_RC_COMMAND_CODE response instead
of returning -EINVAL for unknown TPM commands. This makes user space
more sound.
- CLKRUN fixes:
* Keep #CLKRUN disable through the entier TPM command/response flow
* Check whether #CLKRUN is enabled before disabling and enabling it
again because enabling it breaks PS/2 devices on a system where it
is disabled
* 'next-tpm' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
tpm: remove unused variables
tpm: remove unused data fields from I2C and OF device ID tables
tpm: only attempt to disable the LPC CLKRUN if is already enabled
tpm: follow coding style for variable declaration in tpm_tis_core_init()
tpm: delete the TPM_TIS_CLK_ENABLE flag
tpm: Update MAINTAINERS for Jason Gunthorpe
tpm: Keep CLKRUN enabled throughout the duration of transmit_cmd()
tpm_tis: Move ilb_base_addr to tpm_tis_data
tpm2-cmd: allow more attempts for selftest execution
tpm: return a TPM_RC_COMMAND_CODE response if command is not implemented
tpm: Move Linux RNG connection to hwrng
tpm: use struct tpm_chip for tpm_chip_find_get()
tpm: parse TPM event logs based on EFI table
efi: call get_event_log before ExitBootServices
tpm: add event log format version
tpm: rename event log provider files
tpm: move tpm_eventlog.h outside of drivers folder
tpm: use tpm_msleep() value as max delay
tpm: reduce tpm polling delay in tpm_tis_core
tpm: move wait_for_tpm_stat() to respective driver files
Diffstat (limited to 'drivers/char/tpm/tpm_eventlog_efi.c')
-rw-r--r-- | drivers/char/tpm/tpm_eventlog_efi.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm_eventlog_efi.c b/drivers/char/tpm/tpm_eventlog_efi.c new file mode 100644 index 000000000000..e3f9ffd341d2 --- /dev/null +++ b/drivers/char/tpm/tpm_eventlog_efi.c @@ -0,0 +1,66 @@ +/* + * Copyright (C) 2017 Google + * + * Authors: + * Thiebaud Weksteen <tweek@google.com> + * + * 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 <linux/efi.h> +#include <linux/tpm_eventlog.h> + +#include "tpm.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 = memremap(efi.tpm_log, sizeof(*log_tbl), MEMREMAP_WB); + if (!log_tbl) { + pr_err("Could not map UEFI TPM log table !\n"); + return -ENOMEM; + } + + log_size = log_tbl->size; + memunmap(log_tbl); + + log_tbl = memremap(efi.tpm_log, sizeof(*log_tbl) + log_size, + MEMREMAP_WB); + 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_memunmap; + 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; + memunmap(log_tbl); + return tpm_log_version; + +err_memunmap: + memunmap(log_tbl); + return -ENOMEM; +} |