4 files changed, 18 insertions, 0 deletions

diff --git a/security/integrity/evm/Kconfig b/security/integrity/evm/Kconfig
index afbb59dd262d..fea9749c3756 100644
--- a/security/integrity/evm/Kconfig
+++ b/security/integrity/evm/Kconfig
@@ -11,3 +11,16 @@ config EVM
           integrity attacks.
 
           If you are unsure how to answer this question, answer N.
+
+config EVM_HMAC_VERSION
+        int "EVM HMAC version"
+        depends on EVM
+        default 2
+        help
+          This options adds EVM HMAC version support.
+          1 - original version
+          2 - add per filesystem unique identifier (UUID) (default)
+
+          WARNING: changing the HMAC calculation method or adding 
+          additional info to the calculation, requires existing EVM
+          labeled file systems to be relabeled.  
diff --git a/security/integrity/evm/evm.h b/security/integrity/evm/evm.h
index 3eb30c6db419..30bd1ec0232e 100644
--- a/security/integrity/evm/evm.h
+++ b/security/integrity/evm/evm.h
@@ -24,6 +24,7 @@
 extern int evm_initialized;
 extern char *evm_hmac;
 extern char *evm_hash;
+extern int evm_hmac_version;
 
 extern struct crypto_shash *hmac_tfm;
 extern struct crypto_shash *hash_tfm;
diff --git a/security/integrity/evm/evm_crypto.c b/security/integrity/evm/evm_crypto.c
index dfb26918699c..ff8e2abf8f21 100644
--- a/security/integrity/evm/evm_crypto.c
+++ b/security/integrity/evm/evm_crypto.c
@@ -110,6 +110,9 @@ static void hmac_add_misc(struct shash_desc *desc, struct inode *inode,
         hmac_misc.gid = from_kgid(&init_user_ns, inode->i_gid);
         hmac_misc.mode = inode->i_mode;
         crypto_shash_update(desc, (const u8 *)&hmac_misc, sizeof hmac_misc);
+        if (evm_hmac_version > 1)
+                crypto_shash_update(desc, inode->i_sb->s_uuid,
+                                    sizeof(inode->i_sb->s_uuid));
         crypto_shash_final(desc, digest);
 }
 
diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
index a78a5e21ef70..cdbde1762189 100644
--- a/security/integrity/evm/evm_main.c
+++ b/security/integrity/evm/evm_main.c
@@ -26,6 +26,7 @@ int evm_initialized;
 
 char *evm_hmac = "hmac(sha1)";
 char *evm_hash = "sha1";
+int evm_hmac_version = CONFIG_EVM_HMAC_VERSION;
 
 char *evm_config_xattrnames[] = {
 #ifdef CONFIG_SECURITY_SELINUX