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efi_loader: correctly handle no tpm device error

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When the TCG2 protocol is installed in efi_tcg2_register(),
TPM2 device must be present.
tcg2_measure_pe_image() expects that TCP2 protocol is installed
and TPM device is available. If TCG2 Protocol is installed but
TPM device is not found, tcg2_measure_pe_image() returns
EFI_SECURITY_VIOLATION and efi_load_image() ends with failure.

The same error handling is applied to
efi_tcg2_measure_efi_app_invocation().

Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Masahisa Kojima 2021-12-07 14:15:33 +09:00 • committed by Heinrich Schuchardt
parent 9e32bf9362
commit f9b51dcf29
3 changed files with 18 additions and 8 deletions
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4
lib/efi_loader/efi_tcg2.c
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@ -977,7 +977,7 @@ efi_status_t tcg2_measure_pe_image(void *efi, u64 efi_size,
ret = platform_get_tpm2_device(&dev);
if (ret != EFI_SUCCESS)
return ret;
return EFI_SECURITY_VIOLATION;
switch (handle->image_type) {
case IMAGE_SUBSYSTEM_EFI_APPLICATION:
@ -2200,7 +2200,7 @@ efi_status_t efi_tcg2_measure_efi_app_invocation(struct efi_loaded_image_obj *ha
ret = platform_get_tpm2_device(&dev);
if (ret != EFI_SUCCESS)
return ret;
return EFI_SECURITY_VIOLATION;
ret = tcg2_measure_boot_variable(dev);
if (ret != EFI_SUCCESS)