[UPSTREAM][RFC PATCH] integrity: add informational messages when revoking certs.

[Dimitri John Ledkov]

integrity_load_cert() prints messages of the source and cert details
when adding certs as trusted. Mirror those messages in
uefi_revocation_list_x509() when adding certs as revoked.

Sample dmesg with this change:

    [    1.538741] integrity: Platform Keyring initialized
    [    1.960071] integrity: Loading X.509 certificate: UEFI:db
    [    1.961986] integrity: Loaded X.509 cert 'Microsoft Corporation UEFI CA 2011: 13adbf4309bd82709c8cd54f316ed522988a1bd4'
    [    1.974041] integrity: Revoking X.509 certificate: UEFI:MokListXRT (MOKvar table)
    [    1.978852] blacklist: Revoked X.509 cert 'Canonical Ltd. Secure Boot Signing: 61482aa2830d0ab2ad5af10b7250da9033ddcef0'
    [    1.985850] integrity: Loading X.509 certificate: UEFI:MokListRT (MOKvar table)
    [    1.989651] integrity: Loaded X.509 cert 'Canonical Ltd. Master Certificate Authority: ad91990bc22ab1f517048c23b6655a268e345a63'

Signed-off-by: Dimitri John Ledkov <dimitri.ledkov at canonical.com>
---

 Another RFC patch that I'd like to submit upstream, based on
 v5.13-rc1.

 certs/blacklist.c                                   | 4 ++++
 security/integrity/platform_certs/keyring_handler.c | 1 +
 2 files changed, 5 insertions(+)

diff --git a/certs/blacklist.c b/certs/blacklist.c
index c9a435b15af40..738c496756516 100644
--- a/certs/blacklist.c
+++ b/certs/blacklist.c
@@ -172,6 +172,10 @@ int add_key_to_revocation_list(const char *data, size_t size)
 	if (IS_ERR(key)) {
 		pr_err("Problem with revocation key (%ld)\n", PTR_ERR(key));
 		return PTR_ERR(key);
+	} else {
+		pr_notice("Revoked X.509 cert '%s'\n",
+			  key_ref_to_ptr(key)->description);
+		key_ref_put(key);
 	}
 
 	return 0;
diff --git a/security/integrity/platform_certs/keyring_handler.c b/security/integrity/platform_certs/keyring_handler.c
index 5604bd57c9907..9f85626702b2c 100644
--- a/security/integrity/platform_certs/keyring_handler.c
+++ b/security/integrity/platform_certs/keyring_handler.c
@@ -61,6 +61,7 @@ static __init void uefi_blacklist_binary(const char *source,
 static __init void uefi_revocation_list_x509(const char *source,
 					     const void *data, size_t len)
 {
+	pr_info("Revoking X.509 certificate: %s\n", source);
 	add_key_to_revocation_list(data, len);
 }
 
-- 
2.27.0