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efi_loader: value of VendorKeys

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According to the UEFI specification the variable VendorKeys is 1 if the
"system is configured to use only vendor-provided keys".

As we do not supply any vendor keys yet the variable VendorKeys must be
zero.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2020-07-04 22:41:26 +02:00
parent 37fa7cb045
commit fd7b6730ab
1 changed files with 15 additions and 60 deletions
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75
lib/efi_loader/efi_variable.c
View file

@ -282,45 +282,29 @@ err:
*/
static efi_status_t efi_init_secure_state(void)
{
enum efi_secure_mode mode;
efi_uintn_t size;
enum efi_secure_mode mode = EFI_MODE_SETUP;
efi_uintn_t size = 0;
efi_status_t ret;
/*
* TODO:
* Since there is currently no "platform-specific" installation
* method of Platform Key, we can't say if VendorKeys is 0 or 1
* precisely.
*/
size = 0;
ret = efi_get_variable_int(L"PK", &efi_global_variable_guid,
NULL, &size, NULL, NULL);
if (ret == EFI_BUFFER_TOO_SMALL) {
if (IS_ENABLED(CONFIG_EFI_SECURE_BOOT))
mode = EFI_MODE_USER;
else
mode = EFI_MODE_SETUP;
efi_vendor_keys = 0;
} else if (ret == EFI_NOT_FOUND) {
mode = EFI_MODE_SETUP;
efi_vendor_keys = 1;
} else {
goto err;
}
ret = efi_transfer_secure_state(mode);
if (ret == EFI_SUCCESS)
ret = efi_set_variable_int(L"VendorKeys",
&efi_global_variable_guid,
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS |
EFI_VARIABLE_READ_ONLY,
sizeof(efi_vendor_keys),
&efi_vendor_keys, false);
if (ret != EFI_SUCCESS)
return ret;
err:
/* As we do not provide vendor keys this variable is always 0. */
ret = efi_set_variable_int(L"VendorKeys",
&efi_global_variable_guid,
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS |
EFI_VARIABLE_READ_ONLY,
sizeof(efi_vendor_keys),
&efi_vendor_keys, false);
return ret;
}
@ -998,39 +982,10 @@ out:
if (env_set(native_name, val)) {
ret = EFI_DEVICE_ERROR;
} else {
bool vendor_keys_modified = false;
if ((u16_strcmp(variable_name, L"PK") == 0 &&
guidcmp(vendor, &efi_global_variable_guid) == 0)) {
ret = efi_transfer_secure_state(
(delete ? EFI_MODE_SETUP :
EFI_MODE_USER));
if (ret != EFI_SUCCESS)
goto err;
if (efi_secure_mode != EFI_MODE_SETUP)
vendor_keys_modified = true;
} else if ((u16_strcmp(variable_name, L"KEK") == 0 &&
guidcmp(vendor, &efi_global_variable_guid) == 0)) {
if (efi_secure_mode != EFI_MODE_SETUP)
vendor_keys_modified = true;
}
/* update VendorKeys */
if (vendor_keys_modified & efi_vendor_keys) {
efi_vendor_keys = 0;
ret = efi_set_variable_int(
L"VendorKeys",
&efi_global_variable_guid,
EFI_VARIABLE_BOOTSERVICE_ACCESS
| EFI_VARIABLE_RUNTIME_ACCESS
| EFI_VARIABLE_READ_ONLY,
sizeof(efi_vendor_keys),
&efi_vendor_keys,
false);
} else {
if (!u16_strcmp(variable_name, L"PK"))
ret = efi_init_secure_state();
else
ret = EFI_SUCCESS;
}
}
err: