linux-kernel - [PATCH v7 01/11] KEYS: report to keyctl only actually supported key ops

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Date:   Fri,  1 Mar 2019 20:59:08 +0300
From:   Vitaly Chikunov <vt@...linux.org>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        David Howells <dhowells@...hat.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        linux-integrity@...r.kernel.org, keyrings@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v7 01/11] KEYS: report to keyctl only actually supported key ops

Because with the introduction of EC-RDSA and change in workings of RSA
in regard to sign/verify, akcipher may have not all callbacks defined,
report to keyctl only actually supported ops determined by the presence
of the akcipher callbacks.

Cc: David Howells <dhowells@...hat.com>
Cc: keyrings@...r.kernel.org
Signed-off-by: Vitaly Chikunov <vt@...linux.org>
---
 crypto/asymmetric_keys/public_key.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
index f5d85b47fcc6..c2e4e73fcf06 100644
--- a/crypto/asymmetric_keys/public_key.c
+++ b/crypto/asymmetric_keys/public_key.c
@@ -130,11 +130,17 @@ static int software_key_query(const struct kernel_pkey_params *params,
 	info->max_sig_size = len;
 	info->max_enc_size = len;
 	info->max_dec_size = len;
-	info->supported_ops = (KEYCTL_SUPPORTS_ENCRYPT |
-			       KEYCTL_SUPPORTS_VERIFY);
-	if (pkey->key_is_private)
-		info->supported_ops |= (KEYCTL_SUPPORTS_DECRYPT |
-					KEYCTL_SUPPORTS_SIGN);
+	info->supported_ops = 0;
+	if (crypto_akcipher_alg(tfm)->verify)
+		info->supported_ops |= KEYCTL_SUPPORTS_VERIFY;
+	if (crypto_akcipher_alg(tfm)->encrypt)
+		info->supported_ops |= KEYCTL_SUPPORTS_ENCRYPT;
+	if (pkey->key_is_private) {
+		if (crypto_akcipher_alg(tfm)->decrypt)
+			info->supported_ops |= KEYCTL_SUPPORTS_DECRYPT;
+		if (crypto_akcipher_alg(tfm)->sign)
+			info->supported_ops |= KEYCTL_SUPPORTS_SIGN;
+	}
 	ret = 0;
 
 error_free_tfm:
-- 
2.11.0