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path: root/drivers/char/tpm/eventlog/efi.c
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Diffstat (limited to 'drivers/char/tpm/eventlog/efi.c')
-rw-r--r--drivers/char/tpm/eventlog/efi.c50
1 files changed, 43 insertions, 7 deletions
diff --git a/drivers/char/tpm/eventlog/efi.c b/drivers/char/tpm/eventlog/efi.c
index 3e44362e469c..73b981026627 100644
--- a/drivers/char/tpm/eventlog/efi.c
+++ b/drivers/char/tpm/eventlog/efi.c
@@ -16,10 +16,13 @@
int tpm_read_log_efi(struct tpm_chip *chip)
{
+ struct efi_tcg2_final_events_table *final_tbl = NULL;
struct linux_efi_tpm_eventlog *log_tbl;
struct tpm_bios_log *log;
u32 log_size;
u8 tpm_log_version;
+ void *tmp;
+ int ret;
if (!(chip->flags & TPM_CHIP_FLAG_TPM2))
return -ENODEV;
@@ -47,15 +50,48 @@ int tpm_read_log_efi(struct tpm_chip *chip)
/* malloc EventLog space */
log->bios_event_log = kmemdup(log_tbl->log, log_size, GFP_KERNEL);
- if (!log->bios_event_log)
- goto err_memunmap;
- log->bios_event_log_end = log->bios_event_log + log_size;
+ if (!log->bios_event_log) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ 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:
+ ret = tpm_log_version;
+
+ if (efi.tpm_final_log == EFI_INVALID_TABLE_ADDR ||
+ efi_tpm_final_log_size == 0 ||
+ tpm_log_version != EFI_TCG2_EVENT_LOG_FORMAT_TCG_2)
+ goto out;
+
+ final_tbl = memremap(efi.tpm_final_log,
+ sizeof(*final_tbl) + efi_tpm_final_log_size,
+ MEMREMAP_WB);
+ if (!final_tbl) {
+ pr_err("Could not map UEFI TPM final log\n");
+ kfree(log->bios_event_log);
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ tmp = krealloc(log->bios_event_log,
+ log_size + efi_tpm_final_log_size,
+ GFP_KERNEL);
+ if (!tmp) {
+ kfree(log->bios_event_log);
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ log->bios_event_log = tmp;
+ memcpy((void *)log->bios_event_log + log_size,
+ final_tbl->events, efi_tpm_final_log_size);
+ log->bios_event_log_end = log->bios_event_log +
+ log_size + efi_tpm_final_log_size;
+
+out:
+ memunmap(final_tbl);
memunmap(log_tbl);
- return -ENOMEM;
+ return ret;
}