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[V2] EVM: Only complain about a missing HMAC key once

Message ID 20171011191112.4861-1-mjg59@google.com (mailing list archive)
State New, archived
Headers show

Commit Message

Matthew Garrett Oct. 11, 2017, 7:11 p.m. UTC 
A system can validate EVM digital signatures without requiring an HMAC
key, but every EVM validation will generate a kernel error. Change this
so we only generate an error once.

Signed-off-by: Matthew Garrett <mjg59@google.com>
---
 security/integrity/evm/evm_crypto.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/security/integrity/evm/evm_crypto.c b/security/integrity/evm/evm_crypto.c
index 6435f12b0067..abe53b28f3e3 100644
--- a/security/integrity/evm/evm_crypto.c
+++ b/security/integrity/evm/evm_crypto.c
@@ -80,7 +80,7 @@  static struct shash_desc *init_desc(char type)
 
 	if (type == EVM_XATTR_HMAC) {
 		if (!(evm_initialized & EVM_INIT_HMAC)) {
-			pr_err("HMAC key is not set\n");
+			pr_err_once("HMAC key is not set\n");
 			return ERR_PTR(-ENOKEY);
 		}
 		tfm = &hmac_tfm;