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grub2
0005-appendedsig-The-grub-command-s-trusted-and...
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File 0005-appendedsig-The-grub-command-s-trusted-and-distruste.patch of Package grub2
From f05acf089fb80fc44112a7feec3529af494a41f7 Mon Sep 17 00:00:00 2001 From: Sudhakar Kuppusamy <sudhakar@linux.ibm.com> Date: Wed, 1 Feb 2023 21:42:36 +0530 Subject: [PATCH 5/8] appendedsig: The grub command's trusted and distrusted support To support the following trusted and distrusted commands 1. trusted_list: It will show the list of trusted certificates and binary hashes 2. distrusted_list: It will show the list of distrusted certificates and binary/certificate hashes 3. trusted_certificate: It will add the trusted certificate to the trusted list 4. trusted_signature: It will add the certificate/binary hash to the trusted list 5. distrusted_certificate: It will remove the trusted certificate from trsuted list 6. distrusted_signature: It will add the certificate/binary hash to the distrsuted list Note:- The addition/deletion of trusted certificates and binary hashes are not allowed in grub command prompt while secure boot is enabled. Signed-off-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com> Reviewed-by: Stefan Berger <stefanb@linux.ibm.com> Tested-by: Nageswara Sastry <rnsastry@linux.ibm.com> --- grub-core/commands/appendedsig/appendedsig.c | 547 ++++++++++++------- 1 file changed, 361 insertions(+), 186 deletions(-) diff --git a/grub-core/commands/appendedsig/appendedsig.c b/grub-core/commands/appendedsig/appendedsig.c index f9638220e..7d2bba079 100644 --- a/grub-core/commands/appendedsig/appendedsig.c +++ b/grub-core/commands/appendedsig/appendedsig.c @@ -123,6 +123,38 @@ static enum check_sigs_forced = 2 } check_sigs = check_sigs_no; +enum +{ + OPTION_BINARY_HASH = 0, + OPTION_CERT_HASH = 1 +}; + +static const struct grub_arg_option options[] = +{ + {"binary-hash", 'b', 0, N_("hash file of the binary."), 0, ARG_TYPE_NONE}, + {"cert-hash", 'c', 1, N_("hash file of the certificate."), 0, ARG_TYPE_NONE}, + {0, 0, 0, 0, 0, 0} +}; + +static void +grub_printhex (const grub_uint8_t *data, const grub_size_t length) +{ + grub_size_t i, count = 0; + + for (i = 0; i < length-1; i++) + { + grub_printf ("%02x:", data[i]); + count++; + if (count == 16) + { + grub_printf ("\n\t "); + count = 0; + } + } + + grub_printf ("%02x\n", data[i]); +} + /* * GUID can be used to determine the hashing function and * generate the hash using determined hashing function. @@ -396,75 +428,6 @@ grub_env_write_sec (struct grub_env_var *var __attribute__((unused)), return grub_strdup (grub_env_read_sec (NULL, NULL)); } -static grub_err_t -file_read_all (grub_file_t file, grub_uint8_t **buf, grub_size_t *len) -{ - grub_off_t full_file_size; - grub_size_t file_size, total_read_size = 0; - grub_ssize_t read_size; - - full_file_size = grub_file_size (file); - if (full_file_size == GRUB_FILE_SIZE_UNKNOWN) - return grub_error (GRUB_ERR_BAD_ARGUMENT, - N_("Cannot read a file of unknown size into a buffer")); - - if (full_file_size > GRUB_SIZE_MAX) - return grub_error (GRUB_ERR_OUT_OF_RANGE, - N_("File is too large to read: %" PRIuGRUB_UINT64_T - " bytes"), full_file_size); - - file_size = (grub_size_t) full_file_size; - - *buf = grub_malloc (file_size); - if (!*buf) - return grub_error (GRUB_ERR_OUT_OF_MEMORY, - N_("Could not allocate file data buffer size %" - PRIuGRUB_SIZE), file_size); - - while (total_read_size < file_size) - { - read_size = grub_file_read (file, *buf + total_read_size, file_size - total_read_size); - if (read_size < 0) - { - grub_free (*buf); - return grub_errno; - } - else if (read_size == 0) - { - grub_free (*buf); - return grub_error (GRUB_ERR_IO, - N_("Could not read full file size (%" - PRIuGRUB_SIZE "), only %" PRIuGRUB_SIZE - " bytes read"), file_size, total_read_size); - } - - total_read_size += read_size; - } - *len = file_size; - return GRUB_ERR_NONE; -} - -static grub_err_t -read_cert_from_file (grub_file_t f, struct x509_certificate *certificate) -{ - grub_err_t err; - grub_uint8_t *buf; - grub_size_t file_size; - - err = file_read_all (f, &buf, &file_size); - if (err != GRUB_ERR_NONE) - return err; - - err = parse_x509_certificate (buf, file_size, certificate); - if (err != GRUB_ERR_NONE) - { - grub_free (buf); - return err; - } - - return GRUB_ERR_NONE; -} - static grub_err_t extract_appended_signature (const grub_uint8_t *buf, grub_size_t bufsize, struct grub_appended_signature *sig) @@ -686,159 +649,357 @@ static grub_err_t grub_cmd_verify_signature (grub_command_t cmd __attribute__((unused)), int argc, char **args) { - grub_file_t f; grub_err_t err = GRUB_ERR_NONE; - grub_uint8_t *data; - grub_size_t file_size; + grub_file_t signed_file = NULL; + grub_uint8_t *signed_data = NULL; + grub_ssize_t signed_data_size = 0; + + if (argc != 1) + { + grub_printf (N_("a signed file is expected\n" + "Example:\n\tverify_appended <SIGNED FILE>\n")); + return GRUB_ERR_BAD_ARGUMENT; + } - if (argc < 1) - return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("one argument expected")); + if (grub_strlen (args[0]) == 0) + return grub_error (GRUB_ERR_BAD_FILENAME, N_("missing signed file")); grub_dprintf ("appendedsig", "verifying %s\n", args[0]); - f = grub_file_open (args[0], GRUB_FILE_TYPE_VERIFY_SIGNATURE); - if (!f) + signed_file = grub_file_open (args[0], GRUB_FILE_TYPE_VERIFY_SIGNATURE); + if (signed_file == NULL) + return grub_error (GRUB_ERR_FILE_NOT_FOUND, N_("unable to open a signed file")); + + err = grub_read_file (signed_file, &signed_data, &signed_data_size); + if (err != GRUB_ERR_NONE) + { + grub_file_close (signed_file); + return err; + } + + grub_file_close (signed_file); + err = grub_verify_appended_signature (signed_data, signed_data_size); + grub_free (signed_data); + + return err; +} + +static grub_err_t +grub_cmd_trusted_list (grub_command_t cmd __attribute__((unused)), + int argc __attribute__((unused)), char **args __attribute__((unused))) +{ + struct x509_certificate *cert = NULL; + grub_size_t i = 0, cert_num = 1; + + for (cert = grub_db.keys; cert; cert = cert->next) + { + grub_printf (N_("trusted certificate %" PRIuGRUB_SIZE ":\n"), cert_num); + grub_printf (N_("\tserial: ")); + + for (i = 0; i < cert->serial_len - 1; i++) + grub_printf ("%02x:", cert->serial[i]); + + grub_printf ("%02x\n", cert->serial[cert->serial_len - 1]); + grub_printf ("\tCN: %s\n\n", cert->subject); + cert_num++; + + } + + for (i = 0; i < grub_db.signature_entries; i++) { - err = grub_errno; - goto cleanup; + grub_printf (N_("trusted binary hash %" PRIuGRUB_SIZE ":\n"), i+1); + grub_printf (N_("\thash: ")); + grub_printhex (grub_db.signatures[i], grub_db.signature_size[i]); } - err = file_read_all (f, &data, &file_size); + return GRUB_ERR_NONE; +} + +static grub_err_t +grub_cmd_distrusted_list (grub_command_t cmd __attribute__((unused)), + int argc __attribute__((unused)), + char **args __attribute__((unused))) +{ + struct x509_certificate *cert = NULL; + grub_size_t i = 0, cert_num = 1; + + for (cert = grub_dbx.keys; cert; cert = cert->next) + { + grub_printf (N_("distrusted certificate %" PRIuGRUB_SIZE ":\n"), cert_num); + grub_printf (N_("\tserial: ")); + + for (i = 0; i < cert->serial_len - 1; i++) + grub_printf ("%02x:", cert->serial[i]); + + grub_printf ("%02x\n", cert->serial[cert->serial_len - 1]); + grub_printf ("\tCN: %s\n\n", cert->subject); + cert_num++; + } + + for (i = 0; i < grub_dbx.signature_entries; i++) + { + grub_printf (N_("distrusted certificate/binary hash %" PRIuGRUB_SIZE ":\n"), i+1); + grub_printf (N_("\thash: ")); + grub_printhex (grub_dbx.signatures[i], grub_dbx.signature_size[i]); + } + + return GRUB_ERR_NONE; +} + +static grub_err_t +grub_cmd_trusted_cert (grub_command_t cmd __attribute__((unused)), + int argc, char **args) +{ + grub_err_t err = GRUB_ERR_NONE; + grub_file_t cert_file = NULL; + grub_uint8_t *cert_data = NULL; + grub_ssize_t cert_data_size = 0; + + if (argc != 1) + { + grub_printf (N_("a trusted X.509 certificate file is expected\n" + "Example:\n\ttrusted_certificate <CERT FILE>\n")); + return GRUB_ERR_BAD_ARGUMENT; + } + + if (check_sigs == check_sigs_forced) + { + grub_printf ("Warning: since secure boot is enabled, " + "adding of trusted X.509 certificate is not permitted!\n"); + return grub_errno; + } + + if (grub_strlen (args[0]) == 0) + return grub_error (GRUB_ERR_BAD_FILENAME, + N_("missing trusted X.509 certificate file")); + + cert_file = grub_file_open (args[0], GRUB_FILE_TYPE_CERTIFICATE_TRUST | + GRUB_FILE_TYPE_NO_DECOMPRESS); + if (cert_file == NULL) + return grub_error (GRUB_ERR_FILE_NOT_FOUND, + N_("unable to open the trusted X.509 certificate file")); + + err = grub_read_file (cert_file, &cert_data, &cert_data_size); if (err != GRUB_ERR_NONE) - goto cleanup; + { + grub_file_close (cert_file); + return err; + } - err = grub_verify_appended_signature (data, file_size); + grub_file_close (cert_file); + err = grub_add_certificate (cert_data, cert_data_size, &grub_db, 1); + if (err != GRUB_ERR_NONE) + { + grub_release_trusted_list (); + grub_release_distrusted_list (); + grub_error (err, "adding of trusted certificate failed"); + } - grub_free (data); + grub_free (cert_data); -cleanup: - if (f) - grub_file_close (f); return err; } static grub_err_t -grub_cmd_distrust (grub_command_t cmd __attribute__((unused)), - int argc, char **args) +grub_cmd_trusted_hash (grub_command_t cmd __attribute__((unused)), int argc, char**args) { - unsigned long cert_num, i; - struct x509_certificate *cert, *prev; + grub_err_t rc = GRUB_ERR_NONE; + grub_file_t hash_file = NULL; + grub_uint8_t *hash_data = NULL; + grub_ssize_t hash_data_size = 0; if (argc != 1) - return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("One argument expected")); + { + grub_printf (N_("a trusted binary hash file is expected\n" + "Example:\n\ttrusted_signature <BINARY HASH FILE>\n")); + return GRUB_ERR_BAD_ARGUMENT; + } - grub_errno = GRUB_ERR_NONE; - cert_num = grub_strtoul (args[0], NULL, 10); - if (grub_errno != GRUB_ERR_NONE) - return grub_errno; + if (check_sigs == check_sigs_forced) + { + grub_printf ("Warning: since secure boot is enabled, " + "adding of trusted binary hash is not permitted!\n"); + return grub_errno; + } - if (cert_num < 1) - return grub_error (GRUB_ERR_BAD_ARGUMENT, - N_("Certificate number too small - numbers start at 1")); + if (grub_strlen (args[0]) == 0) + return grub_error (GRUB_ERR_BAD_FILENAME, N_("missing trusted binary hash file")); - if (cert_num == 1) - { - cert = grub_db.keys; - grub_db.keys = cert->next; + hash_file = grub_file_open (args[0], GRUB_FILE_TYPE_TO_HASH | GRUB_FILE_TYPE_NO_DECOMPRESS); + if (hash_file == NULL) + return grub_error (GRUB_ERR_FILE_NOT_FOUND, + N_("unable to open the trusted binary hash file")); - certificate_release (cert); - grub_free (cert); - return GRUB_ERR_NONE; + rc = grub_read_file (hash_file, &hash_data, &hash_data_size); + if (rc != GRUB_ERR_NONE) + { + grub_file_close (hash_file); + return rc; } - i = 2; - prev = grub_db.keys; - cert = grub_db.keys->next; - while (cert) + + grub_file_close (hash_file); + + grub_dprintf ("appendedsig", "adding a trusted binary hash %s\n with size of %" PRIdGRUB_SSIZE "\n", + hash_data, hash_data_size); + + /* only accept SHA256, SHA384 and SHA512 binary hash */ + if (hash_data_size != SHA256_LEN && hash_data_size != SHA384_LEN && + hash_data_size != SHA512_LEN) + return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("unacceptable trusted binary hash type")); + + rc = grub_add_hash ((const grub_uint8_t **) &hash_data, hash_data_size, &grub_db.signatures, + &grub_db.signature_size, &grub_db.signature_entries); + if (rc != GRUB_ERR_NONE) { - if (i == cert_num) - { - prev->next = cert->next; - certificate_release (cert); - grub_free (cert); - return GRUB_ERR_NONE; - } - i++; - prev = cert; - cert = cert->next; + grub_release_trusted_list (); + grub_release_distrusted_list (); + grub_error (rc, "adding of trusted binary hash failed"); } - return grub_error (GRUB_ERR_BAD_ARGUMENT, - N_("No certificate number %lu found - only %lu certificates in the store"), - cert_num, i - 1); + grub_free (hash_data); + + return rc; } static grub_err_t -grub_cmd_trust (grub_command_t cmd __attribute__((unused)), - int argc, char **args) +grub_cmd_distrusted_cert (grub_command_t cmd __attribute__((unused)), int argc, char **args) { - grub_file_t certf; - struct x509_certificate *cert = NULL; - grub_err_t err; + grub_size_t cert_num = 0, i = 1; + struct x509_certificate *current_cert = grub_db.keys; + struct x509_certificate *previous_cert = grub_db.keys; if (argc != 1) - return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("one argument expected")); + { + grub_printf (N_("trusted certificate number is expected\n" + "Example:\n\tdistrusted_certificate <CERT_NUMER>\n")); + return GRUB_ERR_BAD_ARGUMENT; + } - certf = grub_file_open (args[0], - GRUB_FILE_TYPE_CERTIFICATE_TRUST - | GRUB_FILE_TYPE_NO_DECOMPRESS); - if (!certf) - return grub_errno; + if (check_sigs == check_sigs_forced) + { + grub_printf ("Warning: since secure boot is enabled, " + "removing of trusted certificate is not permitted!\n"); + return grub_errno; + } + cert_num = grub_strtoul (args[0], NULL, 10); + if (cert_num < 1) + return grub_error (GRUB_ERR_BAD_ARGUMENT, + N_("trusted certificate number should to begin with 1")); - cert = grub_zalloc (sizeof (struct x509_certificate)); - if (!cert) - return grub_error (GRUB_ERR_OUT_OF_MEMORY, - N_("Could not allocate memory for certificate")); + if (cert_num > grub_db.key_entries) + return grub_error (GRUB_ERR_BAD_ARGUMENT, + N_("trusted certificate number should not exceed %" PRIuGRUB_SIZE), + grub_db.key_entries); + else if (cert_num < grub_db.key_entries) + return grub_error (GRUB_ERR_BAD_ARGUMENT, + N_("there is no certificate on the trusted list. so, not permitted")); - err = read_cert_from_file (certf, cert); - grub_file_close (certf); - if (err != GRUB_ERR_NONE) + for (i = 1; i < grub_db.key_entries; i++) { - grub_free (cert); - return err; + if (cert_num == 1) + { + previous_cert = current_cert->next; + break; + } + else if (cert_num == i) + { + previous_cert->next = current_cert->next; + break; + } + + previous_cert = current_cert; + current_cert = current_cert->next; } - grub_dprintf ("appendedsig", "Loaded certificate with CN: %s\n", - cert->subject); - cert->next = grub_db.keys; - grub_db.keys = cert; + certificate_release (current_cert); + grub_free (current_cert); return GRUB_ERR_NONE; } static grub_err_t -grub_cmd_list (grub_command_t cmd __attribute__((unused)), - int argc __attribute__((unused)), - char **args __attribute__((unused))) +grub_cmd_distrusted_hash (grub_extcmd_context_t ctxt, int argc, char **args) { - struct x509_certificate *cert; - int cert_num = 1; - grub_size_t i; + grub_err_t rc = GRUB_ERR_NONE; + grub_file_t hash_file = NULL; + grub_uint8_t *hash_data = NULL; + grub_ssize_t hash_data_size = 0; - for (cert = grub_db.keys; cert; cert = cert->next) + if (argc != 2) { - grub_printf (N_("Certificate %d:\n"), cert_num); + grub_printf (N_("a distrusted certificate/binary hash file is expected\n" + "Example:\n\tdistrusted_signature [option] <FILE>\n" + "option:\n[-b|--binary-hash] FILE [BINARY HASH FILE]\n" + "[-c|--cert-hash] FILE [CERTFICATE HASH FILE]\n")); + return GRUB_ERR_BAD_ARGUMENT; + } - grub_printf (N_("\tSerial: ")); - for (i = 0; i < cert->serial_len - 1; i++) - { - grub_printf ("%02x:", cert->serial[i]); - } - grub_printf ("%02x\n", cert->serial[cert->serial_len - 1]); + if (check_sigs == check_sigs_forced) + { + grub_printf ("Warning: since secure boot is enabled, " + "adding of distrusted certificate/binary hash is not permitted!\n"); + return grub_errno; + } - grub_printf ("\tCN: %s\n\n", cert->subject); - cert_num++; + if (!ctxt->state[OPTION_BINARY_HASH].set && !ctxt->state[OPTION_CERT_HASH].set) + return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("missing options and use --help to konw")); + + if (grub_strlen (args[1]) == 0) + return grub_error (GRUB_ERR_BAD_FILENAME, + N_("missing distrusted certificate/binary hash file")); + + hash_file = grub_file_open (args[1], GRUB_FILE_TYPE_TO_HASH | GRUB_FILE_TYPE_NO_DECOMPRESS); + if (hash_file == NULL) + return grub_error (GRUB_ERR_FILE_NOT_FOUND, + N_("unable to open the distrusted certificate/binary hash file")); + rc = grub_read_file (hash_file, &hash_data, &hash_data_size); + if (rc != GRUB_ERR_NONE) + { + grub_file_close (hash_file); + return rc; } - return GRUB_ERR_NONE; + grub_file_close (hash_file); + + grub_dprintf ("appendedsig", "adding a distrusted certificate/binary hash %s\n" + " with size of %" PRIdGRUB_SSIZE "\n", hash_data, hash_data_size); + + if (ctxt->state[OPTION_BINARY_HASH].set) + { + /* only accept SHA256, SHA384 and SHA512 binary hash */ + if (hash_data_size != SHA256_LEN && hash_data_size != SHA384_LEN && + hash_data_size != SHA512_LEN) + return grub_error (GRUB_ERR_BAD_SIGNATURE, + N_("unacceptable distrusted binary hash type")); + } + else if (ctxt->state[OPTION_CERT_HASH].set) + { + /* only accept SHA256, SHA384 and SHA512 certificate hash */ + if (hash_data_size != SHA256_LEN && hash_data_size != SHA384_LEN && + hash_data_size != SHA512_LEN) + return grub_error (GRUB_ERR_BAD_SIGNATURE, + N_("unacceptable distrusted certificate hash type")); + } + + rc = grub_add_hash ((const grub_uint8_t **) &hash_data, hash_data_size, &grub_dbx.signatures, + &grub_dbx.signature_size, &grub_dbx.signature_entries); + if (rc != GRUB_ERR_NONE) + { + grub_release_trusted_list (); + grub_release_distrusted_list (); + grub_error (rc, "adding of distrusted binary/certificate hash failed"); + } + + grub_free (hash_data); + + return rc; } static grub_err_t -appendedsig_init (grub_file_t io __attribute__((unused)), - enum grub_file_type type, - void **context __attribute__((unused)), - enum grub_verify_flags *flags) +appendedsig_init (grub_file_t io __attribute__ ((unused)), enum grub_file_type type, + void **context __attribute__ ((unused)), enum grub_verify_flags *flags) { if (check_sigs == check_sigs_no) { @@ -1212,7 +1373,9 @@ grub_load_static_keys (struct grub_module_header *header, bool mode) return rc; } -static grub_command_t cmd_verify, cmd_list, cmd_distrust, cmd_trust; +static grub_extcmd_t cmd_distrusted_hash; +static grub_command_t cmd_verify, cmd_trusted_list, cmd_trusted_cert, cmd_trusted_hash, + cmd_distrusted_list, cmd_distrusted_cert; GRUB_MOD_INIT (appendedsig) { @@ -1278,21 +1441,31 @@ GRUB_MOD_INIT (appendedsig) grub_release_platform_keystore (); } - cmd_trust = - grub_register_command ("trust_certificate", grub_cmd_trust, - N_("X509_CERTIFICATE"), - N_("Add X509_CERTIFICATE to trusted certificates.")); - cmd_list = - grub_register_command ("list_certificates", grub_cmd_list, 0, - N_("Show the list of trusted x509 certificates.")); - cmd_verify = - grub_register_command ("verify_appended", grub_cmd_verify_signature, - N_("FILE"), - N_("Verify FILE against the trusted x509 certificates.")); - cmd_distrust = - grub_register_command ("distrust_certificate", grub_cmd_distrust, - N_("CERT_NUMBER"), - N_("Remove CERT_NUMBER (as listed by list_certificates) from trusted certificates.")); + cmd_trusted_cert = grub_register_command ("trusted_certificate", grub_cmd_trusted_cert, + N_("X509_CERTIFICATE"), + N_("Add X509_CERTIFICATE to trusted list.")); + cmd_trusted_hash = grub_register_command ("trusted_signature", grub_cmd_trusted_hash, + N_("BINARY HASH FILE"), + N_("Add trusted BINARY HASH to trusted list.")); + cmd_distrusted_cert = grub_register_command ("distrusted_certificate", grub_cmd_distrusted_cert, + N_("CERT_NUMBER"), + N_("Remove CERT_NUMBER (as listed by list_trusted)" + " from trusted list.")); + cmd_distrusted_hash = grub_register_extcmd ("distrusted_signature", grub_cmd_distrusted_hash, 0, + N_("[-b|--binary-hash] FILE [BINARY HASH FILE]\n" + "[-c|--cert-hash] FILE [CERTFICATE HASH FILE]"), + N_("Add distrusted CERTFICATE/BINARY HASH " + "to distrusted list."), + options); + cmd_trusted_list = grub_register_command ("trusted_list", grub_cmd_trusted_list, 0, + N_("Show the list of trusted x509 certificates and" + " trusted binary hashes.")); + cmd_distrusted_list = grub_register_command ("distrusted_list", grub_cmd_distrusted_list, 0, + N_("Show the list of distrusted certificates and" + " certificate/binary hashes")); + cmd_verify = grub_register_command ("verify_appended", grub_cmd_verify_signature, N_("FILE"), + N_("Verify FILE against the trusted x509 certificates/" + "trusted binary hashes.")); grub_verifier_register (&grub_appendedsig_verifier); grub_dl_set_persistent (mod); @@ -1304,10 +1477,12 @@ GRUB_MOD_FINI (appendedsig) * grub_dl_set_persistent should prevent this from actually running, but * it does still run under emu. */ - grub_verifier_unregister (&grub_appendedsig_verifier); grub_unregister_command (cmd_verify); - grub_unregister_command (cmd_list); - grub_unregister_command (cmd_trust); - grub_unregister_command (cmd_distrust); + grub_unregister_command (cmd_trusted_list); + grub_unregister_command (cmd_distrusted_list); + grub_unregister_command (cmd_trusted_cert); + grub_unregister_command (cmd_distrusted_cert); + grub_unregister_command (cmd_trusted_hash); + grub_unregister_extcmd (cmd_distrusted_hash); } -- 2.47.0
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