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authorEric Snowberg <eric.snowberg@oracle.com>2023-08-17 17:04:07 +0300
committerJarkko Sakkinen <jarkko@kernel.org>2023-08-17 23:12:41 +0300
commit218a2680624cba1611e3dfc7d9b646d240e5f855 (patch)
tree33548ea3ed0da3ffab3e7cac612ad093e50eb701
parent2ccf8c76b4fb38deb25af3830aa9489b6a374621 (diff)
downloadlinux-218a2680624cba1611e3dfc7d9b646d240e5f855.tar.xz
certs: Reference revocation list for all keyrings
Systems booted with shim have a Forbidden Signature Database called mokx. During boot, hashes and certs contained within the mokx are loaded into the blacklist keyring. When calling verify_pkcs7_message_sig the contents of the blacklist keyring (or revocation list) are referenced when validating keys on the platform keyring. Currently, when validating against the secondary or builtin keyrings, the revocation list is not referenced. Move up the check to allow the revocation list to be used with all keyrings, including the secondary and builtin, allowing the system owner to take corrective action should a vulnerability be found within keys contained within either keyring. Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com> Reviewed-by: Mimi Zohar <zohar@linux.ibm.com> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
-rw-r--r--certs/system_keyring.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/certs/system_keyring.c b/certs/system_keyring.c
index 33841c91f12c..9de610bf1f4b 100644
--- a/certs/system_keyring.c
+++ b/certs/system_keyring.c
@@ -330,6 +330,12 @@ int verify_pkcs7_message_sig(const void *data, size_t len,
if (ret < 0)
goto error;
+ ret = is_key_on_revocation_list(pkcs7);
+ if (ret != -ENOKEY) {
+ pr_devel("PKCS#7 key is on revocation list\n");
+ goto error;
+ }
+
if (!trusted_keys) {
trusted_keys = builtin_trusted_keys;
} else if (trusted_keys == VERIFY_USE_SECONDARY_KEYRING) {
@@ -349,12 +355,6 @@ int verify_pkcs7_message_sig(const void *data, size_t len,
pr_devel("PKCS#7 platform keyring is not available\n");
goto error;
}
-
- ret = is_key_on_revocation_list(pkcs7);
- if (ret != -ENOKEY) {
- pr_devel("PKCS#7 platform key is on revocation list\n");
- goto error;
- }
}
ret = pkcs7_validate_trust(pkcs7, trusted_keys);
if (ret < 0) {