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@@ -575,4 +575,230 @@ efi_status_t efi_image_region_add(struct efi_image_regions *regs,
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return EFI_SUCCESS;
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}
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+
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+/**
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+ * efi_sigstore_free - free signature store
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+ * @sigstore: Pointer to signature store structure
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+ *
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+ * Feee all the memories held in signature store and itself,
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+ * which were allocated by efi_sigstore_parse_sigdb().
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+ */
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+void efi_sigstore_free(struct efi_signature_store *sigstore)
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+{
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+ struct efi_signature_store *sigstore_next;
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+ struct efi_sig_data *sig_data, *sig_data_next;
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+
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+ while (sigstore) {
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+ sigstore_next = sigstore->next;
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+
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+ sig_data = sigstore->sig_data_list;
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+ while (sig_data) {
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+ sig_data_next = sig_data->next;
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+ free(sig_data->data);
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+ free(sig_data);
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+ sig_data = sig_data_next;
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+ }
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+
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+ free(sigstore);
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+ sigstore = sigstore_next;
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+ }
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+}
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+
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+/**
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+ * efi_sigstore_parse_siglist - parse a signature list
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+ * @name: Pointer to signature list
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+ *
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+ * Parse signature list and instantiate a signature store structure.
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+ * Signature database is a simple concatenation of one or more
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+ * signature list(s).
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+ *
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+ * Return: Pointer to signature store on success, NULL on error
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+ */
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+static struct efi_signature_store *
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+efi_sigstore_parse_siglist(struct efi_signature_list *esl)
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+{
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+ struct efi_signature_store *siglist = NULL;
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+ struct efi_sig_data *sig_data, *sig_data_next;
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+ struct efi_signature_data *esd;
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+ size_t left;
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+
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+ /*
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+ * UEFI specification defines certificate types:
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+ * for non-signed images,
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+ * EFI_CERT_SHA256_GUID
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+ * EFI_CERT_RSA2048_GUID
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+ * EFI_CERT_RSA2048_SHA256_GUID
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+ * EFI_CERT_SHA1_GUID
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+ * EFI_CERT_RSA2048_SHA_GUID
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+ * EFI_CERT_SHA224_GUID
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+ * EFI_CERT_SHA384_GUID
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+ * EFI_CERT_SHA512_GUID
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+ *
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+ * for signed images,
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+ * EFI_CERT_X509_GUID
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+ * NOTE: Each certificate will normally be in a separate
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+ * EFI_SIGNATURE_LIST as the size may vary depending on
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+ * its algo's.
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+ *
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+ * for timestamp revocation of certificate,
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+ * EFI_CERT_X509_SHA512_GUID
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+ * EFI_CERT_X509_SHA256_GUID
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+ * EFI_CERT_X509_SHA384_GUID
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+ */
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+
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+ if (esl->signature_list_size
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+ <= (sizeof(*esl) + esl->signature_header_size)) {
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+ debug("Siglist in wrong format\n");
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+ return NULL;
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+ }
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+
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+ /* Create a head */
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+ siglist = calloc(sizeof(*siglist), 1);
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+ if (!siglist) {
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+ debug("Out of memory\n");
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+ goto err;
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+ }
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+ memcpy(&siglist->sig_type, &esl->signature_type, sizeof(efi_guid_t));
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+
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+ /* Go through the list */
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+ sig_data_next = NULL;
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+ left = esl->signature_list_size
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+ - (sizeof(*esl) + esl->signature_header_size);
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+ esd = (struct efi_signature_data *)
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+ ((u8 *)esl + sizeof(*esl) + esl->signature_header_size);
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+
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+ while ((left > 0) && left >= esl->signature_size) {
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+ /* Signature must exist if there is remaining data. */
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+ if (left < esl->signature_size) {
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+ debug("Certificate is too small\n");
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+ goto err;
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+ }
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+
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+ sig_data = calloc(esl->signature_size
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+ - sizeof(esd->signature_owner), 1);
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+ if (!sig_data) {
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+ debug("Out of memory\n");
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+ goto err;
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+ }
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+
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+ /* Append signature data */
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+ memcpy(&sig_data->owner, &esd->signature_owner,
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+ sizeof(efi_guid_t));
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+ sig_data->size = esl->signature_size
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+ - sizeof(esd->signature_owner);
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+ sig_data->data = malloc(sig_data->size);
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+ if (!sig_data->data) {
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+ debug("Out of memory\n");
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+ goto err;
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+ }
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+ memcpy(sig_data->data, esd->signature_data, sig_data->size);
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+
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+ sig_data->next = sig_data_next;
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+ sig_data_next = sig_data;
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+
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+ /* Next */
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+ esd = (struct efi_signature_data *)
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+ ((u8 *)esd + esl->signature_size);
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+ left -= esl->signature_size;
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+ }
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+ siglist->sig_data_list = sig_data_next;
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+
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+ return siglist;
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+
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+err:
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+ efi_sigstore_free(siglist);
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+
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+ return NULL;
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+}
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+
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+/**
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+ * efi_sigstore_parse_sigdb - parse a signature database variable
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+ * @name: Variable's name
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+ *
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+ * Read in a value of signature database variable pointed to by
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+ * @name, parse it and instantiate a signature store structure.
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+ *
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+ * Return: Pointer to signature store on success, NULL on error
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+ */
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+struct efi_signature_store *efi_sigstore_parse_sigdb(u16 *name)
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+{
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+ struct efi_signature_store *sigstore = NULL, *siglist;
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+ struct efi_signature_list *esl;
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+ const efi_guid_t *vendor;
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+ void *db;
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+ efi_uintn_t db_size;
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+ efi_status_t ret;
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+
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+ if (!u16_strcmp(name, L"PK") || !u16_strcmp(name, L"KEK")) {
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+ vendor = &efi_global_variable_guid;
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+ } else if (!u16_strcmp(name, L"db") || !u16_strcmp(name, L"dbx")) {
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+ vendor = &efi_guid_image_security_database;
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+ } else {
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+ debug("unknown signature database, %ls\n", name);
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+ return NULL;
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+ }
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+
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+ /* retrieve variable data */
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+ db_size = 0;
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+ ret = EFI_CALL(efi_get_variable(name, vendor, NULL, &db_size, NULL));
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+ if (ret == EFI_NOT_FOUND) {
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+ debug("variable, %ls, not found\n", name);
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+ sigstore = calloc(sizeof(*sigstore), 1);
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+ return sigstore;
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+ } else if (ret != EFI_BUFFER_TOO_SMALL) {
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+ debug("Getting variable, %ls, failed\n", name);
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+ return NULL;
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+ }
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+
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+ db = malloc(db_size);
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+ if (!db) {
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+ debug("Out of memory\n");
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+ return NULL;
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+ }
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+
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+ ret = EFI_CALL(efi_get_variable(name, vendor, NULL, &db_size, db));
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+ if (ret != EFI_SUCCESS) {
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+ debug("Getting variable, %ls, failed\n", name);
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+ goto err;
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+ }
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+
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+ /* Parse siglist list */
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+ esl = db;
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+ while (db_size > 0) {
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+ /* List must exist if there is remaining data. */
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+ if (db_size < sizeof(*esl)) {
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+ debug("variable, %ls, in wrong format\n", name);
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+ goto err;
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+ }
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+
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+ if (db_size < esl->signature_list_size) {
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+ debug("variable, %ls, in wrong format\n", name);
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+ goto err;
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+ }
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+
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+ /* Parse a single siglist. */
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+ siglist = efi_sigstore_parse_siglist(esl);
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+ if (!siglist) {
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+ debug("Parsing signature list of %ls failed\n", name);
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+ goto err;
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+ }
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+
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+ /* Append siglist */
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+ siglist->next = sigstore;
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+ sigstore = siglist;
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+
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+ /* Next */
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+ db_size -= esl->signature_list_size;
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+ esl = (void *)esl + esl->signature_list_size;
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+ }
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+ free(db);
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+
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+ return sigstore;
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+
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+err:
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+ efi_sigstore_free(sigstore);
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+ free(db);
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+
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+ return NULL;
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+}
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#endif /* CONFIG_EFI_SECURE_BOOT */
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