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authorMatthew Garrett <mjg59@google.com>2019-05-20 13:54:59 -0700
committerJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2019-06-24 23:57:49 +0300
commitc46f3405692de1ac82240d927b9c7a0f9d6a4a36 (patch)
treea7b4937f49900d4c1f46104326fe9b96b38cfbcf /drivers/char/tpm
parent44038bc514a244fba9d0d6d698b15970185ac251 (diff)
tpm: Reserve the TPM final events table
UEFI systems provide a boot services protocol for obtaining the TPM event log, but this is unusable after ExitBootServices() is called. Unfortunately ExitBootServices() itself triggers additional TPM events that then can't be obtained using this protocol. The platform provides a mechanism for the OS to obtain these events by recording them to a separate UEFI configuration table which the OS can then map. Unfortunately this table isn't self describing in terms of providing its length, so we need to parse the events inside it to figure out how long it is. Since the table isn't mapped at this point, we need to extend the length calculation function to be able to map the event as it goes along. (Fixes by Bartosz Szczepanek <bsz@semihalf.com>) Signed-off-by: Matthew Garrett <mjg59@google.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Bartosz Szczepanek <bsz@semihalf.com> Tested-by: Bartosz Szczepanek <bsz@semihalf.com> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Diffstat (limited to 'drivers/char/tpm')
-rw-r--r--drivers/char/tpm/eventlog/tpm2.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/char/tpm/eventlog/tpm2.c b/drivers/char/tpm/eventlog/tpm2.c
index 22b3346b9946..b9aeda1cbcd7 100644
--- a/drivers/char/tpm/eventlog/tpm2.c
+++ b/drivers/char/tpm/eventlog/tpm2.c
@@ -36,7 +36,7 @@
static size_t calc_tpm2_event_size(struct tcg_pcr_event2_head *event,
struct tcg_pcr_event *event_header)
{
- return __calc_tpm2_event_size(event, event_header);
+ return __calc_tpm2_event_size(event, event_header, false);
}
static void *tpm2_bios_measurements_start(struct seq_file *m, loff_t *pos)