| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 068/167] efi/tpm: Differentiate missing and invalid final event log table. | Date | Mon, 26 Jul 2021 17:38:21 +0200 |
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From: Michal Suchanek <msuchanek@suse.de>
[ Upstream commit 674a9f1f6815849bfb5bf385e7da8fc198aaaba9 ]
Missing TPM final event log table is not a firmware bug.
Clearly if providing event log in the old format makes the final event log invalid it should not be provided at least in that case.
Fixes: b4f1874c6216 ("tpm: check event log version before reading final events") Signed-off-by: Michal Suchanek <msuchanek@suse.de> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/firmware/efi/tpm.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/firmware/efi/tpm.c b/drivers/firmware/efi/tpm.c index c1955d320fec..8f665678e9e3 100644 --- a/drivers/firmware/efi/tpm.c +++ b/drivers/firmware/efi/tpm.c @@ -62,9 +62,11 @@ int __init efi_tpm_eventlog_init(void) tbl_size = sizeof(*log_tbl) + log_tbl->size; memblock_reserve(efi.tpm_log, tbl_size); - if (efi.tpm_final_log == EFI_INVALID_TABLE_ADDR || - log_tbl->version != EFI_TCG2_EVENT_LOG_FORMAT_TCG_2) { - pr_warn(FW_BUG "TPM Final Events table missing or invalid\n"); + if (efi.tpm_final_log == EFI_INVALID_TABLE_ADDR) { + pr_info("TPM Final Events table not present\n"); + goto out; + } else if (log_tbl->version != EFI_TCG2_EVENT_LOG_FORMAT_TCG_2) { + pr_warn(FW_BUG "TPM Final Events table invalid\n"); goto out; } -- 2.30.2
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