From: Javier Martinez Canillas javierm@redhat.com
[ Upstream commit 3be54d558c75562e42bc83d665df024bd79d399b ]
If CONFIG_LOAD_UEFI_KEYS is enabled, the kernel attempts to load the certs from the db, dbx and MokListRT EFI variables into the appropriate keyrings.
But it just assumes that the variables will be present and prints an error if the certs can't be loaded, even when is possible that the variables may not exist. For example the MokListRT variable will only be present if shim is used.
So only print an error message about failing to get the certs list from an EFI variable if this is found. Otherwise these printed errors just pollute the kernel log ring buffer with confusing messages like the following:
[ 5.427251] Couldn't get size: 0x800000000000000e [ 5.427261] MODSIGN: Couldn't get UEFI db list [ 5.428012] Couldn't get size: 0x800000000000000e [ 5.428023] Couldn't get UEFI MokListRT
Reported-by: Hans de Goede hdegoede@redhat.com Signed-off-by: Javier Martinez Canillas javierm@redhat.com Tested-by: Hans de Goede hdegoede@redhat.com Acked-by: Ard Biesheuvel ardb@kernel.org Signed-off-by: Mimi Zohar zohar@linux.ibm.com Signed-off-by: Sasha Levin sashal@kernel.org --- security/integrity/platform_certs/load_uefi.c | 40 ++++++++++++------- 1 file changed, 26 insertions(+), 14 deletions(-)
diff --git a/security/integrity/platform_certs/load_uefi.c b/security/integrity/platform_certs/load_uefi.c index 81b19c52832ba..020fc7a11ef0e 100644 --- a/security/integrity/platform_certs/load_uefi.c +++ b/security/integrity/platform_certs/load_uefi.c @@ -39,16 +39,18 @@ static __init bool uefi_check_ignore_db(void) * Get a certificate list blob from the named EFI variable. */ static __init void *get_cert_list(efi_char16_t *name, efi_guid_t *guid, - unsigned long *size) + unsigned long *size, efi_status_t *status) { - efi_status_t status; unsigned long lsize = 4; unsigned long tmpdb[4]; void *db;
- status = efi.get_variable(name, guid, NULL, &lsize, &tmpdb); - if (status != EFI_BUFFER_TOO_SMALL) { - pr_err("Couldn't get size: 0x%lx\n", status); + *status = efi.get_variable(name, guid, NULL, &lsize, &tmpdb); + if (*status == EFI_NOT_FOUND) + return NULL; + + if (*status != EFI_BUFFER_TOO_SMALL) { + pr_err("Couldn't get size: 0x%lx\n", *status); return NULL; }
@@ -56,10 +58,10 @@ static __init void *get_cert_list(efi_char16_t *name, efi_guid_t *guid, if (!db) return NULL;
- status = efi.get_variable(name, guid, NULL, &lsize, db); - if (status != EFI_SUCCESS) { + *status = efi.get_variable(name, guid, NULL, &lsize, db); + if (*status != EFI_SUCCESS) { kfree(db); - pr_err("Error reading db var: 0x%lx\n", status); + pr_err("Error reading db var: 0x%lx\n", *status); return NULL; }
@@ -144,6 +146,7 @@ static int __init load_uefi_certs(void) efi_guid_t mok_var = EFI_SHIM_LOCK_GUID; void *db = NULL, *dbx = NULL, *mok = NULL; unsigned long dbsize = 0, dbxsize = 0, moksize = 0; + efi_status_t status; int rc = 0;
if (!efi.get_variable) @@ -153,9 +156,12 @@ static int __init load_uefi_certs(void) * an error if we can't get them. */ if (!uefi_check_ignore_db()) { - db = get_cert_list(L"db", &secure_var, &dbsize); + db = get_cert_list(L"db", &secure_var, &dbsize, &status); if (!db) { - pr_err("MODSIGN: Couldn't get UEFI db list\n"); + if (status == EFI_NOT_FOUND) + pr_debug("MODSIGN: db variable wasn't found\n"); + else + pr_err("MODSIGN: Couldn't get UEFI db list\n"); } else { rc = parse_efi_signature_list("UEFI:db", db, dbsize, get_handler_for_db); @@ -166,9 +172,12 @@ static int __init load_uefi_certs(void) } }
- mok = get_cert_list(L"MokListRT", &mok_var, &moksize); + mok = get_cert_list(L"MokListRT", &mok_var, &moksize, &status); if (!mok) { - pr_info("Couldn't get UEFI MokListRT\n"); + if (status == EFI_NOT_FOUND) + pr_debug("MokListRT variable wasn't found\n"); + else + pr_info("Couldn't get UEFI MokListRT\n"); } else { rc = parse_efi_signature_list("UEFI:MokListRT", mok, moksize, get_handler_for_db); @@ -177,9 +186,12 @@ static int __init load_uefi_certs(void) kfree(mok); }
- dbx = get_cert_list(L"dbx", &secure_var, &dbxsize); + dbx = get_cert_list(L"dbx", &secure_var, &dbxsize, &status); if (!dbx) { - pr_info("Couldn't get UEFI dbx list\n"); + if (status == EFI_NOT_FOUND) + pr_debug("dbx variable wasn't found\n"); + else + pr_info("Couldn't get UEFI dbx list\n"); } else { rc = parse_efi_signature_list("UEFI:dbx", dbx, dbxsize,