linux-kernel - [PATCH v6 16/20] evm: additional parameter to pass integrity cache entry 'iint'

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Date:	Thu,  2 Jun 2011 08:23:39 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	linux-security-module@...r.kernel.org
Cc:	Dmitry Kasatkin <dmitry.kasatkin@...ia.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	James Morris <jmorris@...ei.org>,
	David Safford <safford@...son.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <greg@...ah.com>,
	Dmitry Kasatkin <dmitry.s.kasatkin@...il.com>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Subject: [PATCH v6 16/20] evm: additional parameter to pass integrity cache entry 'iint'

From: Dmitry Kasatkin <dmitry.kasatkin@...ia.com>

Additional iint parameter allows to skip lookup in the cache.

Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@...ia.com>
Signed-off-by: Mimi Zohar <zohar@...ux.vnet.ibm.com>
---
 include/linux/evm.h               |    8 ++++++--
 security/integrity/evm/evm_main.c |   18 ++++++++----------
 2 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/include/linux/evm.h b/include/linux/evm.h
index c3bc089..8db7b74 100644
--- a/include/linux/evm.h
+++ b/include/linux/evm.h
@@ -11,11 +11,14 @@
 #include <linux/integrity.h>
 #include <linux/xattr.h>
 
+struct integrity_iint_cache;
+
 #ifdef CONFIG_EVM
 extern enum integrity_status evm_verifyxattr(struct dentry *dentry,
 					     const char *xattr_name,
 					     void *xattr_value,
-					     size_t xattr_value_len);
+					     size_t xattr_value_len,
+					     struct integrity_iint_cache *iint);
 extern void evm_inode_post_setattr(struct dentry *dentry, int ia_valid);
 extern int evm_inode_setxattr(struct dentry *dentry, const char *name,
 			      const void *value, size_t size);
@@ -34,7 +37,8 @@ extern int evm_inode_post_init_security(struct inode *inode,
 static inline enum integrity_status evm_verifyxattr(struct dentry *dentry,
 						    const char *xattr_name,
 						    void *xattr_value,
-						    size_t xattr_value_len)
+						    size_t xattr_value_len,
+					struct integrity_iint_cache *iint)
 {
 	return INTEGRITY_UNKNOWN;
 }
diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
index 0f3e8a6..14fbd38 100644
--- a/security/integrity/evm/evm_main.c
+++ b/security/integrity/evm/evm_main.c
@@ -127,21 +127,19 @@ static int evm_protected_xattr(const char *req_xattr_name)
  */
 enum integrity_status evm_verifyxattr(struct dentry *dentry,
 				      const char *xattr_name,
-				      void *xattr_value, size_t xattr_value_len)
+				      void *xattr_value, size_t xattr_value_len,
+				      struct integrity_iint_cache *iint)
 {
-	struct inode *inode = dentry->d_inode;
-	struct integrity_iint_cache *iint;
-	enum integrity_status status;
-
 	if (!evm_initialized || !evm_protected_xattr(xattr_name))
 		return INTEGRITY_UNKNOWN;
 
-	iint = integrity_iint_find(inode);
-	if (!iint)
-		return INTEGRITY_UNKNOWN;
-	status = evm_verify_hmac(dentry, xattr_name, xattr_value,
+	if (!iint) {
+		iint = integrity_iint_find(dentry->d_inode);
+		if (!iint)
+			return INTEGRITY_UNKNOWN;
+	}
+	return evm_verify_hmac(dentry, xattr_name, xattr_value,
 				 xattr_value_len, iint);
-	return status;
 }
 EXPORT_SYMBOL_GPL(evm_verifyxattr);
 
-- 
1.7.3.4

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