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SubjectRe: [PATCH 2/2 v2] efi: print appropriate status message when loading certificates
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On Sun, 2019-03-24 at 08:26 +0800, Lee, Chun-Yi wrote:
> When loading certificates list from UEFI variable, the original error
> message direct shows the efi status code from UEFI firmware. It looks
> ugly:
>
> [ 2.335031] Couldn't get size: 0x800000000000000e
> [ 2.335032] Couldn't get UEFI MokListRT
> [ 2.339985] Couldn't get size: 0x800000000000000e
> [ 2.339987] Couldn't get UEFI dbx list
>
> So, this patch shows the status string instead of status code.
>
> On the other hand, the "Couldn't get UEFI" message doesn't need
> to be exposed when db/dbx/mok variable do not exist. So, this
> patch set the message level to debug.
>
> v2.
> Setting the MODSIGN messagse level to debug.
>
> Link: https://forums.opensuse.org/showthread.php/535324-MODSIGN-Couldn-t-get-UEFI-db-list?p=2897516#post2897516
> Cc: James Morris <jmorris@namei.org>
> Cc: Serge E. Hallyn" <serge@hallyn.com>
> Cc: David Howells <dhowells@redhat.com>
> Cc: Nayna Jain <nayna@linux.ibm.com>
> Cc: Josh Boyer <jwboyer@fedoraproject.org>
> Cc: Mimi Zohar <zohar@linux.ibm.com>
> Signed-off-by: "Lee, Chun-Yi" <jlee@suse.com>
> ---
> security/integrity/platform_certs/load_uefi.c | 13 ++++++++-----
> 1 file changed, 8 insertions(+), 5 deletions(-)
>
> diff --git a/security/integrity/platform_certs/load_uefi.c b/security/integrity/platform_certs/load_uefi.c
> index 81b19c52832b..e65244b31f04 100644
> --- a/security/integrity/platform_certs/load_uefi.c
> +++ b/security/integrity/platform_certs/load_uefi.c
> @@ -48,7 +48,9 @@ static __init void *get_cert_list(efi_char16_t *name, efi_guid_t *guid,
>
> 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);
> + if (status != EFI_NOT_FOUND)
> + pr_err("Couldn't get size: %s\n",
> + efi_status_to_str(status));
> return NULL;
> }
>
> @@ -59,7 +61,8 @@ static __init void *get_cert_list(efi_char16_t *name, efi_guid_t *guid,
> 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: %s\n",
> + efi_status_to_str(status));
> return NULL;
> }
>
> @@ -155,7 +158,7 @@ static int __init load_uefi_certs(void)
> if (!uefi_check_ignore_db()) {
> db = get_cert_list(L"db", &secure_var, &dbsize);
> if (!db) {
> - pr_err("MODSIGN: Couldn't get UEFI db list\n");
> + pr_debug("MODSIGN: Couldn't get UEFI db list\n");

Sure, this is fine.

> } else {
> rc = parse_efi_signature_list("UEFI:db",
> db, dbsize, get_handler_for_db);
> @@ -168,7 +171,7 @@ static int __init load_uefi_certs(void)
>
> mok = get_cert_list(L"MokListRT", &mok_var, &moksize);
> if (!mok) {
> - pr_info("Couldn't get UEFI MokListRT\n");
> + pr_debug("Couldn't get UEFI MokListRT\n");

This is fine too.

> } else {
> rc = parse_efi_signature_list("UEFI:MokListRT",
> mok, moksize, get_handler_for_db);
> @@ -179,7 +182,7 @@ static int __init load_uefi_certs(void)
>
> dbx = get_cert_list(L"dbx", &secure_var, &dbxsize);
> if (!dbx) {
> - pr_info("Couldn't get UEFI dbx list\n");
> + pr_debug("Couldn't get UEFI dbx list\n");

If there isn't a db or moklist, then this is fine.  My concern is not
having an indication that the dbx wasn't installed, when it should
have been.

Perhaps similar to the "Loading compiled-in X.509 certificates"
informational message there should informational messages for db, mok,
and dbx as well.

Mimi


> } else {
> rc = parse_efi_signature_list("UEFI:dbx",
> dbx, dbxsize,

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