s390-tools/s390-tools-sles15sp2-35-zkey-Allow-zkey-cryptsetup-setkey-to-set-different-k.patch

Subject: zkey: Allow 'zkey-cryptsetup setkey' to set different key types
From: Ingo Franzki <ifranzki@linux.ibm.com>

Summary:     zkey: Add support for CCA AES CIPHER keys
Description: With CCA 5 there is a new secure key type, the so called 
             variable length symmetric cipher key token. This token format
             can hold AES keys with size 128, 192 and 256 bits together
             with additional attributes cryptographic bound to the key
             token. The attributes may limit the usage of the key, for
             example restrict export or usability scope. So this key type
             is considered to be even more secure than the traditional 
             secure key token. This key token type is also called "CCA
             AES CIPHER key", where the formerly used key token is called
             "CCA AES DATA key".
             The zkey as well as the zkey-cryptsetup tools are enhanced
             to support AES CIPHER keys. That is, zkey can manage AES DATA 
             keys, as well as AES CIPHER keys. The key type must be specified
             at key generation time, the default is to generate AED DATA
             keys.
Upstream-ID: bc987c8d18ddeb6fec46113a7fe7588555b592e7
Problem-ID:  SEC1717

Upstream-Description:

             zkey: Allow 'zkey-cryptsetup setkey' to set different key types

             When a secure key has been converted from type CCA-AESDATA to type
             CCA-AESCIPHER, the secure key stored in the LUKS2 header of a volume
             encrypted with that key should also changed.

             Command 'zkey-cryptsetup setkey' allows to set (replace) the volume
             key in the LUKS2 header. It now accepts keys to be set that have
             a different size of the original volume keys. CCA-AESCIPHER keys
             are larger than CCA-AESDATA keys.

             Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com>
             Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
             Signed-off-by: Jan Hoeppner <hoeppner@linux.ibm.com>


Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com>
---
 zkey/zkey-cryptsetup.c |    9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

--- a/zkey/zkey-cryptsetup.c
+++ b/zkey/zkey-cryptsetup.c
@@ -2169,14 +2169,7 @@ static int command_setkey(void)
 	if (rc < 0)
 		goto out;
 
-	if (keysize != newkey_size) {
-		warnx("The secure key in file '%s' has an invalid size",
-		      g.master_key_file);
-		rc = -EINVAL;
-		goto out;
-	}
-
-	if (memcmp(newkey, key, keysize) == 0) {
+	if (keysize == newkey_size && memcmp(newkey, key, keysize) == 0) {
 		warnx("The secure key in file '%s' is equal to the current "
 		      "volume key, setkey is ignored", g.master_key_file);
 		rc = 0;