Merge branch 'next-evm' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/ima-2.6 into next

Conflicts:
	fs/attr.c

Resolve conflict manually.

Signed-off-by: James Morris <jmorris@namei.org>

Documentation/ABI/testing/evm

@@ -0,0 +1,23 @@
+What:		security/evm
+Date:		March 2011
+Contact:	Mimi Zohar <zohar@us.ibm.com>
+Description:
+		EVM protects a file's security extended attributes(xattrs)
+		against integrity attacks. The initial method maintains an
+		HMAC-sha1 value across the extended attributes, storing the
+		value as the extended attribute 'security.evm'.
+
+		EVM depends on the Kernel Key Retention System to provide it
+		with a trusted/encrypted key for the HMAC-sha1 operation.
+		The key is loaded onto the root's keyring using keyctl.  Until
+		EVM receives notification that the key has been successfully
+		loaded onto the keyring (echo 1 > <securityfs>/evm), EVM
+		can not create or validate the 'security.evm' xattr, but
+		returns INTEGRITY_UNKNOWN.  Loading the key and signaling EVM
+		should be done as early as possible.  Normally this is done
+		in the initramfs, which has already been measured as part
+		of the trusted boot.  For more information on creating and
+		loading existing trusted/encrypted keys, refer to:
+		Documentation/keys-trusted-encrypted.txt.  (A sample dracut
+		patch, which loads the trusted/encrypted key and enables
+		EVM, is available from http://linux-ima.sourceforge.net/#EVM.)

Documentation/kernel-parameters.txt

@@ -48,6 +48,7 @@ parameter is applicable:
 	EDD	BIOS Enhanced Disk Drive Services (EDD) is enabled
 	EFI	EFI Partitioning (GPT) is enabled
 	EIDE	EIDE/ATAPI support is enabled.
+	EVM	Extended Verification Module
 	FB	The frame buffer device is enabled.
 	GCOV	GCOV profiling is enabled.
 	HW	Appropriate hardware is enabled.
@@ -758,6 +759,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			This option is obsoleted by the "netdev=" option, which
 			has equivalent usage. See its documentation for details.
 
+	evm=		[EVM]
+			Format: { "fix" }
+			Permit 'security.evm' to be updated regardless of
+			current integrity status.
+
 	failslab=
 	fail_page_alloc=
 	fail_make_request=[KNL]

fs/attr.c

@@ -13,6 +13,7 @@
 #include <linux/fsnotify.h>
 #include <linux/fcntl.h>
 #include <linux/security.h>
+#include <linux/evm.h>
 
 /**
  * inode_change_ok - check if attribute changes to an inode are allowed
@@ -237,8 +238,10 @@ int notify_change(struct dentry * dentry, struct iattr * attr)
 	else
 		error = simple_setattr(dentry, attr);
 
-	if (!error)
+	if (!error) {
 		fsnotify_change(dentry, ia_valid);
+		evm_inode_post_setattr(dentry, ia_valid);
+	}
 
 	return error;
 }

fs/btrfs/xattr.c

@@ -374,36 +374,36 @@ int btrfs_removexattr(struct dentry *dentry, const char *name)
 				XATTR_REPLACE);
 }
 
-int btrfs_xattr_security_init(struct btrfs_trans_handle *trans,
-			      struct inode *inode, struct inode *dir,
-			      const struct qstr *qstr)
+int btrfs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
+		     void *fs_info)
 {
-	int err;
-	size_t len;
-	void *value;
-	char *suffix;
+	const struct xattr *xattr;
+	struct btrfs_trans_handle *trans = fs_info;
 	char *name;
+	int err = 0;
 
-	err = security_inode_init_security(inode, dir, qstr, &suffix, &value,
-					   &len);
-	if (err) {
-		if (err == -EOPNOTSUPP)
-			return 0;
-		return err;
-	}
-
-	name = kmalloc(XATTR_SECURITY_PREFIX_LEN + strlen(suffix) + 1,
-		       GFP_NOFS);
-	if (!name) {
-		err = -ENOMEM;
-	} else {
+	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
+		name = kmalloc(XATTR_SECURITY_PREFIX_LEN +
+			       strlen(xattr->name) + 1, GFP_NOFS);
+		if (!name) {
+			err = -ENOMEM;
+			break;
+		}
 		strcpy(name, XATTR_SECURITY_PREFIX);
-		strcpy(name + XATTR_SECURITY_PREFIX_LEN, suffix);
-		err = __btrfs_setxattr(trans, inode, name, value, len, 0);
+		strcpy(name + XATTR_SECURITY_PREFIX_LEN, xattr->name);
+		err = __btrfs_setxattr(trans, inode, name,
+				       xattr->value, xattr->value_len, 0);
 		kfree(name);
+		if (err < 0)
+			break;
 	}
-
-	kfree(suffix);
-	kfree(value);
 	return err;
 }
+
+int btrfs_xattr_security_init(struct btrfs_trans_handle *trans,
+			      struct inode *inode, struct inode *dir,
+			      const struct qstr *qstr)
+{
+	return security_inode_init_security(inode, dir, qstr,
+					    &btrfs_initxattrs, trans);
+}

fs/ext2/xattr_security.c

@@ -46,28 +46,30 @@ ext2_xattr_security_set(struct dentry *dentry, const char *name,
 			      value, size, flags);
 }
 
-int
-ext2_init_security(struct inode *inode, struct inode *dir,
-		   const struct qstr *qstr)
+int ext2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
+		    void *fs_info)
 {
-	int err;
-	size_t len;
-	void *value;
-	char *name;
+	const struct xattr *xattr;
+	int err = 0;
 
-	err = security_inode_init_security(inode, dir, qstr, &name, &value, &len);
-	if (err) {
-		if (err == -EOPNOTSUPP)
-			return 0;
-		return err;
+	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
+		err = ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY,
+				     xattr->name, xattr->value,
+				     xattr->value_len, 0);
+		if (err < 0)
+			break;
 	}
-	err = ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY,
-			     name, value, len, 0);
-	kfree(name);
-	kfree(value);
 	return err;
 }
 
+int
+ext2_init_security(struct inode *inode, struct inode *dir,
+		   const struct qstr *qstr)
+{
+	return security_inode_init_security(inode, dir, qstr,
+					    &ext2_initxattrs, NULL);
+}
+
 const struct xattr_handler ext2_xattr_security_handler = {
 	.prefix	= XATTR_SECURITY_PREFIX,
 	.list	= ext2_xattr_security_list,

fs/ext3/xattr_security.c

@@ -48,28 +48,32 @@ ext3_xattr_security_set(struct dentry *dentry, const char *name,
 			      name, value, size, flags);
 }
 
-int
-ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
-		   const struct qstr *qstr)
+int ext3_initxattrs(struct inode *inode, const struct xattr *xattr_array,
+		    void *fs_info)
 {
-	int err;
-	size_t len;
-	void *value;
-	char *name;
+	const struct xattr *xattr;
+	handle_t *handle = fs_info;
+	int err = 0;
 
-	err = security_inode_init_security(inode, dir, qstr, &name, &value, &len);
-	if (err) {
-		if (err == -EOPNOTSUPP)
-			return 0;
-		return err;
+	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
+		err = ext3_xattr_set_handle(handle, inode,
+					    EXT3_XATTR_INDEX_SECURITY,
+					    xattr->name, xattr->value,
+					    xattr->value_len, 0);
+		if (err < 0)
+			break;
 	}
-	err = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_SECURITY,
-				    name, value, len, 0);
-	kfree(name);
-	kfree(value);
 	return err;
 }
 
+int
+ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
+		   const struct qstr *qstr)
+{
+	return security_inode_init_security(inode, dir, qstr,
+					    &ext3_initxattrs, handle);
+}
+
 const struct xattr_handler ext3_xattr_security_handler = {
 	.prefix	= XATTR_SECURITY_PREFIX,
 	.list	= ext3_xattr_security_list,

fs/ext4/xattr_security.c

@@ -48,28 +48,32 @@ ext4_xattr_security_set(struct dentry *dentry, const char *name,
 			      name, value, size, flags);
 }
 
-int
-ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
-		   const struct qstr *qstr)
+int ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array,
+		    void *fs_info)
 {
-	int err;
-	size_t len;
-	void *value;
-	char *name;
+	const struct xattr *xattr;
+	handle_t *handle = fs_info;
+	int err = 0;
 
-	err = security_inode_init_security(inode, dir, qstr, &name, &value, &len);
-	if (err) {
-		if (err == -EOPNOTSUPP)
-			return 0;
-		return err;
+	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
+		err = ext4_xattr_set_handle(handle, inode,
+					    EXT4_XATTR_INDEX_SECURITY,
+					    xattr->name, xattr->value,
+					    xattr->value_len, 0);
+		if (err < 0)
+			break;
 	}
-	err = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_SECURITY,
-				    name, value, len, 0);
-	kfree(name);
-	kfree(value);
 	return err;
 }
 
+int
+ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
+		   const struct qstr *qstr)
+{
+	return security_inode_init_security(inode, dir, qstr,
+					    &ext4_initxattrs, handle);
+}
+
 const struct xattr_handler ext4_xattr_security_handler = {
 	.prefix	= XATTR_SECURITY_PREFIX,
 	.list	= ext4_xattr_security_list,

fs/gfs2/inode.c

@@ -624,31 +624,29 @@ fail:
 	return error;
 }
 
-static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
-			      const struct qstr *qstr)
+int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
+		    void *fs_info)
 {
-	int err;
-	size_t len;
-	void *value;
-	char *name;
-
-	err = security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
-					   &name, &value, &len);
-
-	if (err) {
-		if (err == -EOPNOTSUPP)
-			return 0;
-		return err;
+	const struct xattr *xattr;
+	int err = 0;
+
+	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
+		err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
+				       xattr->value_len, 0,
+				       GFS2_EATYPE_SECURITY);
+		if (err < 0)
+			break;
 	}
-
-	err = __gfs2_xattr_set(&ip->i_inode, name, value, len, 0,
-			       GFS2_EATYPE_SECURITY);
-	kfree(value);
-	kfree(name);
-
 	return err;
 }
 
+static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
+			      const struct qstr *qstr)
+{
+	return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
+					    &gfs2_initxattrs, NULL);
+}
+
 /**
  * gfs2_create_inode - Create a new inode
  * @dir: The parent directory

fs/jffs2/security.c

@@ -22,26 +22,29 @@
 #include <linux/security.h>
 #include "nodelist.h"
 
-/* ---- Initial Security Label Attachment -------------- */
-int jffs2_init_security(struct inode *inode, struct inode *dir,
-			const struct qstr *qstr)
+/* ---- Initial Security Label(s) Attachment callback --- */
+int jffs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
+		     void *fs_info)
 {
-	int rc;
-	size_t len;
-	void *value;
-	char *name;
+	const struct xattr *xattr;
+	int err = 0;
 
-	rc = security_inode_init_security(inode, dir, qstr, &name, &value, &len);
-	if (rc) {
-		if (rc == -EOPNOTSUPP)
-			return 0;
-		return rc;
+	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
+		err = do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY,
+					xattr->name, xattr->value,
+					xattr->value_len, 0);
+		if (err < 0)
+			break;
 	}
-	rc = do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY, name, value, len, 0);
+	return err;
+}
 
-	kfree(name);
-	kfree(value);
-	return rc;
+/* ---- Initial Security Label(s) Attachment ----------- */
+int jffs2_init_security(struct inode *inode, struct inode *dir,
+			const struct qstr *qstr)
+{
+	return security_inode_init_security(inode, dir, qstr,
+					    &jffs2_initxattrs, NULL);
 }
 
 /* ---- XATTR Handler for "security.*" ----------------- */

fs/jfs/xattr.c

@@ -1089,38 +1089,37 @@ int jfs_removexattr(struct dentry *dentry, const char *name)
 }
 
 #ifdef CONFIG_JFS_SECURITY
-int jfs_init_security(tid_t tid, struct inode *inode, struct inode *dir,
-		      const struct qstr *qstr)
+int jfs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
+		   void *fs_info)
 {
-	int rc;
-	size_t len;
-	void *value;
-	char *suffix;
+	const struct xattr *xattr;
+	tid_t *tid = fs_info;
 	char *name;
-
-	rc = security_inode_init_security(inode, dir, qstr, &suffix, &value,
-					  &len);
-	if (rc) {
-		if (rc == -EOPNOTSUPP)
-			return 0;
-		return rc;
-	}
-	name = kmalloc(XATTR_SECURITY_PREFIX_LEN + 1 + strlen(suffix),
-		       GFP_NOFS);
-	if (!name) {
-		rc = -ENOMEM;
-		goto kmalloc_failed;
+	int err = 0;
+
+	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
+		name = kmalloc(XATTR_SECURITY_PREFIX_LEN +
+			       strlen(xattr->name) + 1, GFP_NOFS);
+		if (!name) {
+			err = -ENOMEM;
+			break;
+		}
+		strcpy(name, XATTR_SECURITY_PREFIX);
+		strcpy(name + XATTR_SECURITY_PREFIX_LEN, xattr->name);
+
+		err = __jfs_setxattr(*tid, inode, name,
+				     xattr->value, xattr->value_len, 0);
+		kfree(name);
+		if (err < 0)
+			break;
 	}
-	strcpy(name, XATTR_SECURITY_PREFIX);
-	strcpy(name + XATTR_SECURITY_PREFIX_LEN, suffix);
-
-	rc = __jfs_setxattr(tid, inode, name, value, len, 0);
-
-	kfree(name);
-kmalloc_failed:
-	kfree(suffix);
-	kfree(value);
+	return err;
+}
 
-	return rc;
+int jfs_init_security(tid_t tid, struct inode *inode, struct inode *dir,
+		      const struct qstr *qstr)
+{
+	return security_inode_init_security(inode, dir, qstr,
+					    &jfs_initxattrs, &tid);
 }
 #endif

fs/ocfs2/xattr.c

@@ -7185,20 +7185,9 @@ int ocfs2_init_security_and_acl(struct inode *dir,
 {
 	int ret = 0;
 	struct buffer_head *dir_bh = NULL;
-	struct ocfs2_security_xattr_info si = {
-		.enable = 1,
-	};
 
-	ret = ocfs2_init_security_get(inode, dir, qstr, &si);
+	ret = ocfs2_init_security_get(inode, dir, qstr, NULL);
 	if (!ret) {
-		ret = ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_SECURITY,
-				      si.name, si.value, si.value_len,
-				      XATTR_CREATE);
-		if (ret) {
-			mlog_errno(ret);
-			goto leave;
-		}
-	} else if (ret != -EOPNOTSUPP) {
 		mlog_errno(ret);
 		goto leave;
 	}
@@ -7255,6 +7244,22 @@ static int ocfs2_xattr_security_set(struct dentry *dentry, const char *name,
 			       name, value, size, flags);
 }
 
+int ocfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
+		     void *fs_info)
+{
+	const struct xattr *xattr;
+	int err = 0;
+
+	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
+		err = ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_SECURITY,
+				      xattr->name, xattr->value,
+				      xattr->value_len, XATTR_CREATE);
+		if (err)
+			break;
+	}
+	return err;
+}
+
 int ocfs2_init_security_get(struct inode *inode,
 			    struct inode *dir,
 			    const struct qstr *qstr,
@@ -7263,8 +7268,13 @@ int ocfs2_init_security_get(struct inode *inode,
 	/* check whether ocfs2 support feature xattr */
 	if (!ocfs2_supports_xattr(OCFS2_SB(dir->i_sb)))
 		return -EOPNOTSUPP;
-	return security_inode_init_security(inode, dir, qstr, &si->name,
-					    &si->value, &si->value_len);
+	if (si)
+		return security_old_inode_init_security(inode, dir, qstr,
+							&si->name, &si->value,
+							&si->value_len);
+
+	return security_inode_init_security(inode, dir, qstr,
+					    &ocfs2_initxattrs, NULL);
 }
 
 int ocfs2_init_security_set(handle_t *handle,

fs/reiserfs/xattr_security.c

@@ -66,8 +66,8 @@ int reiserfs_security_init(struct inode *dir, struct inode *inode,
 	if (IS_PRIVATE(dir))
 		return 0;
 
-	error = security_inode_init_security(inode, dir, qstr, &sec->name,
-					     &sec->value, &sec->length);
+	error = security_old_inode_init_security(inode, dir, qstr, &sec->name,
+						 &sec->value, &sec->length);
 	if (error) {
 		if (error == -EOPNOTSUPP)
 			error = 0;

fs/xattr.c

@@ -14,6 +14,7 @@
 #include <linux/mount.h>
 #include <linux/namei.h>
 #include <linux/security.h>
+#include <linux/evm.h>
 #include <linux/syscalls.h>
 #include <linux/module.h>
 #include <linux/fsnotify.h>
@@ -166,6 +167,64 @@ out_noalloc:
 }
 EXPORT_SYMBOL_GPL(xattr_getsecurity);
 
+/*
+ * vfs_getxattr_alloc - allocate memory, if necessary, before calling getxattr
+ *
+ * Allocate memory, if not already allocated, or re-allocate correct size,
+ * before retrieving the extended attribute.
+ *
+ * Returns the result of alloc, if failed, or the getxattr operation.
+ */
+ssize_t
+vfs_getxattr_alloc(struct dentry *dentry, const char *name, char **xattr_value,
+		   size_t xattr_size, gfp_t flags)
+{
+	struct inode *inode = dentry->d_inode;
+	char *value = *xattr_value;
+	int error;
+
+	error = xattr_permission(inode, name, MAY_READ);
+	if (error)
+		return error;
+
+	if (!inode->i_op->getxattr)
+		return -EOPNOTSUPP;
+
+	error = inode->i_op->getxattr(dentry, name, NULL, 0);
+	if (error < 0)
+		return error;
+
+	if (!value || (error > xattr_size)) {
+		value = krealloc(*xattr_value, error + 1, flags);
+		if (!value)
+			return -ENOMEM;
+		memset(value, 0, error + 1);
+	}
+
+	error = inode->i_op->getxattr(dentry, name, value, error);
+	*xattr_value = value;
+	return error;
+}
+
+/* Compare an extended attribute value with the given value */
+int vfs_xattr_cmp(struct dentry *dentry, const char *xattr_name,
+		  const char *value, size_t size, gfp_t flags)
+{
+	char *xattr_value = NULL;
+	int rc;
+
+	rc = vfs_getxattr_alloc(dentry, xattr_name, &xattr_value, 0, flags);
+	if (rc < 0)
+		return rc;
+
+	if ((rc != size) || (memcmp(xattr_value, value, rc) != 0))
+		rc = -EINVAL;
+	else
+		rc = 0;
+	kfree(xattr_value);
+	return rc;
+}
+
 ssize_t
 vfs_getxattr(struct dentry *dentry, const char *name, void *value, size_t size)
 {
@@ -243,8 +302,10 @@ vfs_removexattr(struct dentry *dentry, const char *name)
 	error = inode->i_op->removexattr(dentry, name);
 	mutex_unlock(&inode->i_mutex);
 
-	if (!error)
+	if (!error) {
 		fsnotify_xattr(dentry);
+		evm_inode_post_removexattr(dentry, name);
+	}
 	return error;
 }
 EXPORT_SYMBOL_GPL(vfs_removexattr);

fs/xfs/linux-2.6/xfs_iops.c

@@ -94,37 +94,38 @@ xfs_mark_inode_dirty(
 		mark_inode_dirty(inode);
 }
 
+
+int xfs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
+		   void *fs_info)
+{
+	const struct xattr *xattr;
+	struct xfs_inode *ip = XFS_I(inode);
+	int error = 0;
+
+	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
+		error = xfs_attr_set(ip, xattr->name, xattr->value,
+				     xattr->value_len, ATTR_SECURE);
+		if (error < 0)
+			break;
+	}
+	return error;
+}
+
 /*
  * Hook in SELinux.  This is not quite correct yet, what we really need
  * here (as we do for default ACLs) is a mechanism by which creation of
  * these attrs can be journalled at inode creation time (along with the
  * inode, of course, such that log replay can't cause these to be lost).
  */
+
 STATIC int
 xfs_init_security(
 	struct inode	*inode,
 	struct inode	*dir,
 	const struct qstr *qstr)
 {
-	struct xfs_inode *ip = XFS_I(inode);
-	size_t		length;
-	void		*value;
-	unsigned char	*name;
-	int		error;
-
-	error = security_inode_init_security(inode, dir, qstr, (char **)&name,
-					     &value, &length);
-	if (error) {
-		if (error == -EOPNOTSUPP)
-			return 0;
-		return -error;
-	}
-
-	error = xfs_attr_set(ip, name, value, length, ATTR_SECURE);
-
-	kfree(name);
-	kfree(value);
-	return error;
+	return security_inode_init_security(inode, dir, qstr,
+					    &xfs_initxattrs, NULL);
 }
 
 static void

include/linux/evm.h

@@ -0,0 +1,92 @@
+/*
+ * evm.h
+ *
+ * Copyright (c) 2009 IBM Corporation
+ * Author: Mimi Zohar <zohar@us.ibm.com>
+ */
+
+#ifndef _LINUX_EVM_H
+#define _LINUX_EVM_H
+
+#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,
+					     struct integrity_iint_cache *iint);
+extern int evm_inode_setattr(struct dentry *dentry, struct iattr *attr);
+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);
+extern void evm_inode_post_setxattr(struct dentry *dentry,
+				    const char *xattr_name,
+				    const void *xattr_value,
+				    size_t xattr_value_len);
+extern int evm_inode_removexattr(struct dentry *dentry, const char *xattr_name);
+extern void evm_inode_post_removexattr(struct dentry *dentry,
+				       const char *xattr_name);
+extern int evm_inode_init_security(struct inode *inode,
+				   const struct xattr *xattr_array,
+				   struct xattr *evm);
+#else
+#ifdef CONFIG_INTEGRITY
+static inline enum integrity_status evm_verifyxattr(struct dentry *dentry,
+						    const char *xattr_name,
+						    void *xattr_value,
+						    size_t xattr_value_len,
+					struct integrity_iint_cache *iint)
+{
+	return INTEGRITY_UNKNOWN;
+}
+#endif
+
+static int evm_inode_setattr(struct dentry *dentry, struct iattr *attr)
+{
+	return 0;
+}
+
+static inline void evm_inode_post_setattr(struct dentry *dentry, int ia_valid)
+{
+	return;
+}
+
+static inline int evm_inode_setxattr(struct dentry *dentry, const char *name,
+				     const void *value, size_t size)
+{
+	return 0;
+}
+
+static inline void evm_inode_post_setxattr(struct dentry *dentry,
+					   const char *xattr_name,
+					   const void *xattr_value,
+					   size_t xattr_value_len)
+{
+	return;
+}
+
+static inline int evm_inode_removexattr(struct dentry *dentry,
+					const char *xattr_name)
+{
+	return 0;
+}
+
+static inline void evm_inode_post_removexattr(struct dentry *dentry,
+					      const char *xattr_name)
+{
+	return;
+}
+
+static inline int evm_inode_init_security(struct inode *inode,
+					  const struct xattr *xattr_array,
+					  struct xattr *evm)
+{
+	return -EOPNOTSUPP;
+}
+
+#endif /* CONFIG_EVM_H */
+#endif /* LINUX_EVM_H */

include/linux/ima.h

@@ -15,8 +15,6 @@ struct linux_binprm;
 
 #ifdef CONFIG_IMA
 extern int ima_bprm_check(struct linux_binprm *bprm);
-extern int ima_inode_alloc(struct inode *inode);
-extern void ima_inode_free(struct inode *inode);
 extern int ima_file_check(struct file *file, int mask);
 extern void ima_file_free(struct file *file);
 extern int ima_file_mmap(struct file *file, unsigned long prot);
@@ -27,16 +25,6 @@ static inline int ima_bprm_check(struct linux_binprm *bprm)
 	return 0;
 }
 
-static inline int ima_inode_alloc(struct inode *inode)
-{
-	return 0;
-}
-
-static inline void ima_inode_free(struct inode *inode)
-{
-	return;
-}
-
 static inline int ima_file_check(struct file *file, int mask)
 {
 	return 0;
@@ -51,6 +39,5 @@ static inline int ima_file_mmap(struct file *file, unsigned long prot)
 {
 	return 0;
 }
-
 #endif /* CONFIG_IMA_H */
 #endif /* _LINUX_IMA_H */

include/linux/integrity.h

@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2009 IBM Corporation
+ * Author: Mimi Zohar <zohar@us.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ */
+
+#ifndef _LINUX_INTEGRITY_H
+#define _LINUX_INTEGRITY_H
+
+#include <linux/fs.h>
+
+enum integrity_status {
+	INTEGRITY_PASS = 0,
+	INTEGRITY_FAIL,
+	INTEGRITY_NOLABEL,
+	INTEGRITY_UNKNOWN,
+};
+
+/* List of EVM protected security xattrs */
+#ifdef CONFIG_INTEGRITY
+extern int integrity_inode_alloc(struct inode *inode);
+extern void integrity_inode_free(struct inode *inode);
+
+#else
+static inline int integrity_inode_alloc(struct inode *inode)
+{
+	return 0;
+}
+
+static inline void integrity_inode_free(struct inode *inode)
+{
+	return;
+}
+#endif /* CONFIG_INTEGRITY_H */
+#endif /* _LINUX_INTEGRITY_H */

include/linux/security.h

@@ -36,6 +36,7 @@
 #include <linux/key.h>
 #include <linux/xfrm.h>
 #include <linux/slab.h>
+#include <linux/xattr.h>
 #include <net/flow.h>
 
 /* Maximum number of letters for an LSM name string */
@@ -147,6 +148,10 @@ extern int mmap_min_addr_handler(struct ctl_table *table, int write,
 				 void __user *buffer, size_t *lenp, loff_t *ppos);
 #endif
 
+/* security_inode_init_security callback function to write xattrs */
+typedef int (*initxattrs) (struct inode *inode,
+			   const struct xattr *xattr_array, void *fs_data);
+
 #ifdef CONFIG_SECURITY
 
 struct security_mnt_opts {
@@ -1704,8 +1709,11 @@ int security_sb_parse_opts_str(char *options, struct security_mnt_opts *opts);
 int security_inode_alloc(struct inode *inode);
 void security_inode_free(struct inode *inode);
 int security_inode_init_security(struct inode *inode, struct inode *dir,
-				 const struct qstr *qstr, char **name,
-				 void **value, size_t *len);
+				 const struct qstr *qstr,
+				 initxattrs initxattrs, void *fs_data);
+int security_old_inode_init_security(struct inode *inode, struct inode *dir,
+				     const struct qstr *qstr, char **name,
+				     void **value, size_t *len);
 int security_inode_create(struct inode *dir, struct dentry *dentry, int mode);
 int security_inode_link(struct dentry *old_dentry, struct inode *dir,
 			 struct dentry *new_dentry);
@@ -2034,9 +2042,8 @@ static inline void security_inode_free(struct inode *inode)
 static inline int security_inode_init_security(struct inode *inode,
 						struct inode *dir,
 						const struct qstr *qstr,
-						char **name,
-						void **value,
-						size_t *len)
+						initxattrs initxattrs,
+						void *fs_data)
 {
 	return -EOPNOTSUPP;
 }

include/linux/xattr.h

@@ -30,6 +30,9 @@
 #define XATTR_USER_PREFIX_LEN (sizeof (XATTR_USER_PREFIX) - 1)
 
 /* Security namespace */
+#define XATTR_EVM_SUFFIX "evm"
+#define XATTR_NAME_EVM XATTR_SECURITY_PREFIX XATTR_EVM_SUFFIX
+
 #define XATTR_SELINUX_SUFFIX "selinux"
 #define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX
 
@@ -67,6 +70,12 @@ struct xattr_handler {
 		   size_t size, int flags, int handler_flags);
 };
 
+struct xattr {
+	char *name;
+	void *value;
+	size_t value_len;
+};
+
 ssize_t xattr_getsecurity(struct inode *, const char *, void *, size_t);
 ssize_t vfs_getxattr(struct dentry *, const char *, void *, size_t);
 ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
@@ -78,7 +87,10 @@ ssize_t generic_getxattr(struct dentry *dentry, const char *name, void *buffer,
 ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
 int generic_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags);
 int generic_removexattr(struct dentry *dentry, const char *name);
-
+ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name,
+			   char **xattr_value, size_t size, gfp_t flags);
+int vfs_xattr_cmp(struct dentry *dentry, const char *xattr_name,
+		  const char *value, size_t size, gfp_t flags);
 #endif  /*  __KERNEL__  */
 
 #endif	/* _LINUX_XATTR_H */

mm/shmem.c

@@ -1458,7 +1458,7 @@ shmem_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 	inode = shmem_get_inode(dir->i_sb, dir, mode, dev, VM_NORESERVE);
 	if (inode) {
 		error = security_inode_init_security(inode, dir,
-						     &dentry->d_name, NULL,
+						     &dentry->d_name,
 						     NULL, NULL);
 		if (error) {
 			if (error != -EOPNOTSUPP) {
@@ -1598,7 +1598,7 @@ static int shmem_symlink(struct inode *dir, struct dentry *dentry, const char *s
 	if (!inode)
 		return -ENOSPC;
 
-	error = security_inode_init_security(inode, dir, &dentry->d_name, NULL,
+	error = security_inode_init_security(inode, dir, &dentry->d_name,
 					     NULL, NULL);
 	if (error) {
 		if (error != -EOPNOTSUPP) {

security/Kconfig

@@ -186,7 +186,7 @@ source security/smack/Kconfig
 source security/tomoyo/Kconfig
 source security/apparmor/Kconfig
 
-source security/integrity/ima/Kconfig
+source security/integrity/Kconfig
 
 choice
 	prompt "Default security module"

security/Makefile

@@ -24,5 +24,5 @@ obj-$(CONFIG_SECURITY_APPARMOR)		+= apparmor/built-in.o
 obj-$(CONFIG_CGROUP_DEVICE)		+= device_cgroup.o
 
 # Object integrity file lists
-subdir-$(CONFIG_IMA)			+= integrity/ima
-obj-$(CONFIG_IMA)			+= integrity/ima/built-in.o
+subdir-$(CONFIG_INTEGRITY)		+= integrity
+obj-$(CONFIG_INTEGRITY)			+= integrity/built-in.o

security/integrity/Kconfig

@@ -0,0 +1,7 @@
+#
+config INTEGRITY
+	def_bool y
+	depends on IMA || EVM
+
+source security/integrity/ima/Kconfig
+source security/integrity/evm/Kconfig

security/integrity/Makefile

@@ -0,0 +1,12 @@
+#
+# Makefile for caching inode integrity data (iint)
+#
+
+obj-$(CONFIG_INTEGRITY) += integrity.o
+
+integrity-y := iint.o
+
+subdir-$(CONFIG_IMA)			+= ima
+obj-$(CONFIG_IMA)			+= ima/built-in.o
+subdir-$(CONFIG_EVM)			+= evm
+obj-$(CONFIG_EVM)			+= evm/built-in.o

security/integrity/evm/Kconfig

@@ -0,0 +1,12 @@
+config EVM
+	boolean "EVM support"
+	depends on SECURITY && KEYS && ENCRYPTED_KEYS
+	select CRYPTO_HMAC
+	select CRYPTO_MD5
+	select CRYPTO_SHA1
+	default n
+	help
+	  EVM protects a file's security extended attributes against
+	  integrity attacks.
+
+	  If you are unsure how to answer this question, answer N.

security/integrity/evm/Makefile

@@ -0,0 +1,6 @@
+#
+# Makefile for building the Extended Verification Module(EVM)
+#
+obj-$(CONFIG_EVM) += evm.o
+
+evm-y := evm_main.o evm_crypto.o evm_secfs.o

security/integrity/evm/evm.h

@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2005-2010 IBM Corporation
+ *
+ * Authors:
+ * Mimi Zohar <zohar@us.ibm.com>
+ * Kylene Hall <kjhall@us.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * File: evm.h
+ *
+ */
+#include <linux/xattr.h>
+#include <linux/security.h>
+#include "../integrity.h"
+
+extern int evm_initialized;
+extern char *evm_hmac;
+
+extern struct crypto_shash *hmac_tfm;
+
+/* List of EVM protected security xattrs */
+extern char *evm_config_xattrnames[];
+
+extern int evm_init_key(void);
+extern int evm_update_evmxattr(struct dentry *dentry,
+			       const char *req_xattr_name,
+			       const char *req_xattr_value,
+			       size_t req_xattr_value_len);
+extern int evm_calc_hmac(struct dentry *dentry, const char *req_xattr_name,
+			 const char *req_xattr_value,
+			 size_t req_xattr_value_len, char *digest);
+extern int evm_init_hmac(struct inode *inode, const struct xattr *xattr,
+			 char *hmac_val);
+extern int evm_init_secfs(void);
+extern void evm_cleanup_secfs(void);

security/integrity/evm/evm_crypto.c

@@ -0,0 +1,216 @@
+/*
+ * Copyright (C) 2005-2010 IBM Corporation
+ *
+ * Authors:
+ * Mimi Zohar <zohar@us.ibm.com>
+ * Kylene Hall <kjhall@us.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * File: evm_crypto.c
+ *	 Using root's kernel master key (kmk), calculate the HMAC
+ */
+
+#include <linux/module.h>
+#include <linux/crypto.h>
+#include <linux/xattr.h>
+#include <keys/encrypted-type.h>
+#include <crypto/hash.h>
+#include "evm.h"
+
+#define EVMKEY "evm-key"
+#define MAX_KEY_SIZE 128
+static unsigned char evmkey[MAX_KEY_SIZE];
+static int evmkey_len = MAX_KEY_SIZE;
+
+struct crypto_shash *hmac_tfm;
+
+static struct shash_desc *init_desc(void)
+{
+	int rc;
+	struct shash_desc *desc;
+
+	if (hmac_tfm == NULL) {
+		hmac_tfm = crypto_alloc_shash(evm_hmac, 0, CRYPTO_ALG_ASYNC);
+		if (IS_ERR(hmac_tfm)) {
+			pr_err("Can not allocate %s (reason: %ld)\n",
+			       evm_hmac, PTR_ERR(hmac_tfm));
+			rc = PTR_ERR(hmac_tfm);
+			hmac_tfm = NULL;
+			return ERR_PTR(rc);
+		}
+	}
+
+	desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(hmac_tfm),
+			GFP_KERNEL);
+	if (!desc)
+		return ERR_PTR(-ENOMEM);
+
+	desc->tfm = hmac_tfm;
+	desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
+
+	rc = crypto_shash_setkey(hmac_tfm, evmkey, evmkey_len);
+	if (rc)
+		goto out;
+	rc = crypto_shash_init(desc);
+out:
+	if (rc) {
+		kfree(desc);
+		return ERR_PTR(rc);
+	}
+	return desc;
+}
+
+/* Protect against 'cutting & pasting' security.evm xattr, include inode
+ * specific info.
+ *
+ * (Additional directory/file metadata needs to be added for more complete
+ * protection.)
+ */
+static void hmac_add_misc(struct shash_desc *desc, struct inode *inode,
+			  char *digest)
+{
+	struct h_misc {
+		unsigned long ino;
+		__u32 generation;
+		uid_t uid;
+		gid_t gid;
+		umode_t mode;
+	} hmac_misc;
+
+	memset(&hmac_misc, 0, sizeof hmac_misc);
+	hmac_misc.ino = inode->i_ino;
+	hmac_misc.generation = inode->i_generation;
+	hmac_misc.uid = inode->i_uid;
+	hmac_misc.gid = inode->i_gid;
+	hmac_misc.mode = inode->i_mode;
+	crypto_shash_update(desc, (const u8 *)&hmac_misc, sizeof hmac_misc);
+	crypto_shash_final(desc, digest);
+}
+
+/*
+ * Calculate the HMAC value across the set of protected security xattrs.
+ *
+ * Instead of retrieving the requested xattr, for performance, calculate
+ * the hmac using the requested xattr value. Don't alloc/free memory for
+ * each xattr, but attempt to re-use the previously allocated memory.
+ */
+int evm_calc_hmac(struct dentry *dentry, const char *req_xattr_name,
+		  const char *req_xattr_value, size_t req_xattr_value_len,
+		  char *digest)
+{
+	struct inode *inode = dentry->d_inode;
+	struct shash_desc *desc;
+	char **xattrname;
+	size_t xattr_size = 0;
+	char *xattr_value = NULL;
+	int error;
+	int size;
+
+	if (!inode->i_op || !inode->i_op->getxattr)
+		return -EOPNOTSUPP;
+	desc = init_desc();
+	if (IS_ERR(desc))
+		return PTR_ERR(desc);
+
+	error = -ENODATA;
+	for (xattrname = evm_config_xattrnames; *xattrname != NULL; xattrname++) {
+		if ((req_xattr_name && req_xattr_value)
+		    && !strcmp(*xattrname, req_xattr_name)) {
+			error = 0;
+			crypto_shash_update(desc, (const u8 *)req_xattr_value,
+					     req_xattr_value_len);
+			continue;
+		}
+		size = vfs_getxattr_alloc(dentry, *xattrname,
+					  &xattr_value, xattr_size, GFP_NOFS);
+		if (size == -ENOMEM) {
+			error = -ENOMEM;
+			goto out;
+		}
+		if (size < 0)
+			continue;
+
+		error = 0;
+		xattr_size = size;
+		crypto_shash_update(desc, (const u8 *)xattr_value, xattr_size);
+	}
+	hmac_add_misc(desc, inode, digest);
+
+out:
+	kfree(xattr_value);
+	kfree(desc);
+	return error;
+}
+
+/*
+ * Calculate the hmac and update security.evm xattr
+ *
+ * Expects to be called with i_mutex locked.
+ */
+int evm_update_evmxattr(struct dentry *dentry, const char *xattr_name,
+			const char *xattr_value, size_t xattr_value_len)
+{
+	struct inode *inode = dentry->d_inode;
+	struct evm_ima_xattr_data xattr_data;
+	int rc = 0;
+
+	rc = evm_calc_hmac(dentry, xattr_name, xattr_value,
+			   xattr_value_len, xattr_data.digest);
+	if (rc == 0) {
+		xattr_data.type = EVM_XATTR_HMAC;
+		rc = __vfs_setxattr_noperm(dentry, XATTR_NAME_EVM,
+					   &xattr_data,
+					   sizeof(xattr_data), 0);
+	}
+	else if (rc == -ENODATA)
+		rc = inode->i_op->removexattr(dentry, XATTR_NAME_EVM);
+	return rc;
+}
+
+int evm_init_hmac(struct inode *inode, const struct xattr *lsm_xattr,
+		  char *hmac_val)
+{
+	struct shash_desc *desc;
+
+	desc = init_desc();
+	if (IS_ERR(desc)) {
+		printk(KERN_INFO "init_desc failed\n");
+		return PTR_ERR(desc);
+	}
+
+	crypto_shash_update(desc, lsm_xattr->value, lsm_xattr->value_len);
+	hmac_add_misc(desc, inode, hmac_val);
+	kfree(desc);
+	return 0;
+}
+
+/*
+ * Get the key from the TPM for the SHA1-HMAC
+ */
+int evm_init_key(void)
+{
+	struct key *evm_key;
+	struct encrypted_key_payload *ekp;
+	int rc = 0;
+
+	evm_key = request_key(&key_type_encrypted, EVMKEY, NULL);
+	if (IS_ERR(evm_key))
+		return -ENOENT;
+
+	down_read(&evm_key->sem);
+	ekp = evm_key->payload.data;
+	if (ekp->decrypted_datalen > MAX_KEY_SIZE) {
+		rc = -EINVAL;
+		goto out;
+	}
+	memcpy(evmkey, ekp->decrypted_data, ekp->decrypted_datalen);
+out:
+	/* burn the original key contents */
+	memset(ekp->decrypted_data, 0, ekp->decrypted_datalen);
+	up_read(&evm_key->sem);
+	key_put(evm_key);
+	return rc;
+}

security/integrity/evm/evm_main.c

@@ -0,0 +1,384 @@
+/*
+ * Copyright (C) 2005-2010 IBM Corporation
+ *
+ * Author:
+ * Mimi Zohar <zohar@us.ibm.com>
+ * Kylene Hall <kjhall@us.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * File: evm_main.c
+ *	implements evm_inode_setxattr, evm_inode_post_setxattr,
+ *	evm_inode_removexattr, and evm_verifyxattr
+ */
+
+#include <linux/module.h>
+#include <linux/crypto.h>
+#include <linux/xattr.h>
+#include <linux/integrity.h>
+#include <linux/evm.h>
+#include <crypto/hash.h>
+#include "evm.h"
+
+int evm_initialized;
+
+char *evm_hmac = "hmac(sha1)";
+
+char *evm_config_xattrnames[] = {
+#ifdef CONFIG_SECURITY_SELINUX
+	XATTR_NAME_SELINUX,
+#endif
+#ifdef CONFIG_SECURITY_SMACK
+	XATTR_NAME_SMACK,
+#endif
+	XATTR_NAME_CAPS,
+	NULL
+};
+
+static int evm_fixmode;
+static int __init evm_set_fixmode(char *str)
+{
+	if (strncmp(str, "fix", 3) == 0)
+		evm_fixmode = 1;
+	return 0;
+}
+__setup("evm=", evm_set_fixmode);
+
+/*
+ * evm_verify_hmac - calculate and compare the HMAC with the EVM xattr
+ *
+ * Compute the HMAC on the dentry's protected set of extended attributes
+ * and compare it against the stored security.evm xattr.
+ *
+ * For performance:
+ * - use the previoulsy retrieved xattr value and length to calculate the
+ *   HMAC.)
+ * - cache the verification result in the iint, when available.
+ *
+ * Returns integrity status
+ */
+static enum integrity_status evm_verify_hmac(struct dentry *dentry,
+					     const char *xattr_name,
+					     char *xattr_value,
+					     size_t xattr_value_len,
+					     struct integrity_iint_cache *iint)
+{
+	struct evm_ima_xattr_data xattr_data;
+	enum integrity_status evm_status;
+	int rc;
+
+	if (iint && iint->evm_status == INTEGRITY_PASS)
+		return iint->evm_status;
+
+	/* if status is not PASS, try to check again - against -ENOMEM */
+
+	rc = evm_calc_hmac(dentry, xattr_name, xattr_value,
+			   xattr_value_len, xattr_data.digest);
+	if (rc < 0)
+		goto err_out;
+
+	xattr_data.type = EVM_XATTR_HMAC;
+	rc = vfs_xattr_cmp(dentry, XATTR_NAME_EVM, (u8 *)&xattr_data,
+			   sizeof xattr_data, GFP_NOFS);
+	if (rc < 0)
+		goto err_out;
+	evm_status = INTEGRITY_PASS;
+	goto out;
+
+err_out:
+	switch (rc) {
+	case -ENODATA:		/* file not labelled */
+		evm_status = INTEGRITY_NOLABEL;
+		break;
+	default:
+		evm_status = INTEGRITY_FAIL;
+	}
+out:
+	if (iint)
+		iint->evm_status = evm_status;
+	return evm_status;
+}
+
+static int evm_protected_xattr(const char *req_xattr_name)
+{
+	char **xattrname;
+	int namelen;
+	int found = 0;
+
+	namelen = strlen(req_xattr_name);
+	for (xattrname = evm_config_xattrnames; *xattrname != NULL; xattrname++) {
+		if ((strlen(*xattrname) == namelen)
+		    && (strncmp(req_xattr_name, *xattrname, namelen) == 0)) {
+			found = 1;
+			break;
+		}
+		if (strncmp(req_xattr_name,
+			    *xattrname + XATTR_SECURITY_PREFIX_LEN,
+			    strlen(req_xattr_name)) == 0) {
+			found = 1;
+			break;
+		}
+	}
+	return found;
+}
+
+/**
+ * evm_verifyxattr - verify the integrity of the requested xattr
+ * @dentry: object of the verify xattr
+ * @xattr_name: requested xattr
+ * @xattr_value: requested xattr value
+ * @xattr_value_len: requested xattr value length
+ *
+ * Calculate the HMAC for the given dentry and verify it against the stored
+ * security.evm xattr. For performance, use the xattr value and length
+ * previously retrieved to calculate the HMAC.
+ *
+ * Returns the xattr integrity status.
+ *
+ * This function requires the caller to lock the inode's i_mutex before it
+ * is executed.
+ */
+enum integrity_status evm_verifyxattr(struct dentry *dentry,
+				      const char *xattr_name,
+				      void *xattr_value, size_t xattr_value_len,
+				      struct integrity_iint_cache *iint)
+{
+	if (!evm_initialized || !evm_protected_xattr(xattr_name))
+		return INTEGRITY_UNKNOWN;
+
+	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);
+}
+EXPORT_SYMBOL_GPL(evm_verifyxattr);
+
+/*
+ * evm_protect_xattr - protect the EVM extended attribute
+ *
+ * Prevent security.evm from being modified or removed.
+ */
+static int evm_protect_xattr(struct dentry *dentry, const char *xattr_name,
+			     const void *xattr_value, size_t xattr_value_len)
+{
+	if (strcmp(xattr_name, XATTR_NAME_EVM) == 0) {
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+	}
+	return 0;
+}
+
+/*
+ * evm_verify_current_integrity - verify the dentry's metadata integrity
+ * @dentry: pointer to the affected dentry
+ *
+ * Verify and return the dentry's metadata integrity. The exceptions are
+ * before EVM is initialized or in 'fix' mode.
+ */
+static enum integrity_status evm_verify_current_integrity(struct dentry *dentry)
+{
+	struct inode *inode = dentry->d_inode;
+
+	if (!evm_initialized || !S_ISREG(inode->i_mode) || evm_fixmode)
+		return 0;
+	return evm_verify_hmac(dentry, NULL, NULL, 0, NULL);
+}
+
+/**
+ * evm_inode_setxattr - protect the EVM extended attribute
+ * @dentry: pointer to the affected dentry
+ * @xattr_name: pointer to the affected extended attribute name
+ * @xattr_value: pointer to the new extended attribute value
+ * @xattr_value_len: pointer to the new extended attribute value length
+ *
+ * Updating 'security.evm' requires CAP_SYS_ADMIN privileges and that
+ * the current value is valid.
+ */
+int evm_inode_setxattr(struct dentry *dentry, const char *xattr_name,
+		       const void *xattr_value, size_t xattr_value_len)
+{
+
+	enum integrity_status evm_status;
+	int ret;
+
+	ret = evm_protect_xattr(dentry, xattr_name, xattr_value,
+				xattr_value_len);
+	if (ret)
+		return ret;
+	evm_status = evm_verify_current_integrity(dentry);
+	return evm_status == INTEGRITY_PASS ? 0 : -EPERM;
+}
+
+/**
+ * evm_inode_removexattr - protect the EVM extended attribute
+ * @dentry: pointer to the affected dentry
+ * @xattr_name: pointer to the affected extended attribute name
+ *
+ * Removing 'security.evm' requires CAP_SYS_ADMIN privileges and that
+ * the current value is valid.
+ */
+int evm_inode_removexattr(struct dentry *dentry, const char *xattr_name)
+{
+	enum integrity_status evm_status;
+	int ret;
+
+	ret = evm_protect_xattr(dentry, xattr_name, NULL, 0);
+	if (ret)
+		return ret;
+	evm_status = evm_verify_current_integrity(dentry);
+	return evm_status == INTEGRITY_PASS ? 0 : -EPERM;
+}
+
+/**
+ * evm_inode_post_setxattr - update 'security.evm' to reflect the changes
+ * @dentry: pointer to the affected dentry
+ * @xattr_name: pointer to the affected extended attribute name
+ * @xattr_value: pointer to the new extended attribute value
+ * @xattr_value_len: pointer to the new extended attribute value length
+ *
+ * Update the HMAC stored in 'security.evm' to reflect the change.
+ *
+ * No need to take the i_mutex lock here, as this function is called from
+ * __vfs_setxattr_noperm().  The caller of which has taken the inode's
+ * i_mutex lock.
+ */
+void evm_inode_post_setxattr(struct dentry *dentry, const char *xattr_name,
+			     const void *xattr_value, size_t xattr_value_len)
+{
+	if (!evm_initialized || !evm_protected_xattr(xattr_name))
+		return;
+
+	evm_update_evmxattr(dentry, xattr_name, xattr_value, xattr_value_len);
+	return;
+}
+
+/**
+ * evm_inode_post_removexattr - update 'security.evm' after removing the xattr
+ * @dentry: pointer to the affected dentry
+ * @xattr_name: pointer to the affected extended attribute name
+ *
+ * Update the HMAC stored in 'security.evm' to reflect removal of the xattr.
+ */
+void evm_inode_post_removexattr(struct dentry *dentry, const char *xattr_name)
+{
+	struct inode *inode = dentry->d_inode;
+
+	if (!evm_initialized || !evm_protected_xattr(xattr_name))
+		return;
+
+	mutex_lock(&inode->i_mutex);
+	evm_update_evmxattr(dentry, xattr_name, NULL, 0);
+	mutex_unlock(&inode->i_mutex);
+	return;
+}
+
+/**
+ * evm_inode_setattr - prevent updating an invalid EVM extended attribute
+ * @dentry: pointer to the affected dentry
+ */
+int evm_inode_setattr(struct dentry *dentry, struct iattr *attr)
+{
+	unsigned int ia_valid = attr->ia_valid;
+	enum integrity_status evm_status;
+
+	if (ia_valid & ~(ATTR_MODE | ATTR_UID | ATTR_GID))
+		return 0;
+	evm_status = evm_verify_current_integrity(dentry);
+	return evm_status == INTEGRITY_PASS ? 0 : -EPERM;
+}
+
+/**
+ * evm_inode_post_setattr - update 'security.evm' after modifying metadata
+ * @dentry: pointer to the affected dentry
+ * @ia_valid: for the UID and GID status
+ *
+ * For now, update the HMAC stored in 'security.evm' to reflect UID/GID
+ * changes.
+ *
+ * This function is called from notify_change(), which expects the caller
+ * to lock the inode's i_mutex.
+ */
+void evm_inode_post_setattr(struct dentry *dentry, int ia_valid)
+{
+	if (!evm_initialized)
+		return;
+
+	if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID))
+		evm_update_evmxattr(dentry, NULL, NULL, 0);
+	return;
+}
+
+/*
+ * evm_inode_init_security - initializes security.evm
+ */
+int evm_inode_init_security(struct inode *inode,
+				 const struct xattr *lsm_xattr,
+				 struct xattr *evm_xattr)
+{
+	struct evm_ima_xattr_data *xattr_data;
+	int rc;
+
+	if (!evm_initialized || !evm_protected_xattr(lsm_xattr->name))
+		return -EOPNOTSUPP;
+
+	xattr_data = kzalloc(sizeof(*xattr_data), GFP_NOFS);
+	if (!xattr_data)
+		return -ENOMEM;
+
+	xattr_data->type = EVM_XATTR_HMAC;
+	rc = evm_init_hmac(inode, lsm_xattr, xattr_data->digest);
+	if (rc < 0)
+		goto out;
+
+	evm_xattr->value = xattr_data;
+	evm_xattr->value_len = sizeof(*xattr_data);
+	evm_xattr->name = kstrdup(XATTR_EVM_SUFFIX, GFP_NOFS);
+	return 0;
+out:
+	kfree(xattr_data);
+	return rc;
+}
+EXPORT_SYMBOL_GPL(evm_inode_init_security);
+
+static int __init init_evm(void)
+{
+	int error;
+
+	error = evm_init_secfs();
+	if (error < 0) {
+		printk(KERN_INFO "EVM: Error registering secfs\n");
+		goto err;
+	}
+err:
+	return error;
+}
+
+static void __exit cleanup_evm(void)
+{
+	evm_cleanup_secfs();
+	if (hmac_tfm)
+		crypto_free_shash(hmac_tfm);
+}
+
+/*
+ * evm_display_config - list the EVM protected security extended attributes
+ */
+static int __init evm_display_config(void)
+{
+	char **xattrname;
+
+	for (xattrname = evm_config_xattrnames; *xattrname != NULL; xattrname++)
+		printk(KERN_INFO "EVM: %s\n", *xattrname);
+	return 0;
+}
+
+pure_initcall(evm_display_config);
+late_initcall(init_evm);
+
+MODULE_DESCRIPTION("Extended Verification Module");
+MODULE_LICENSE("GPL");

security/integrity/evm/evm_secfs.c

@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2010 IBM Corporation
+ *
+ * Authors:
+ * Mimi Zohar <zohar@us.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * File: evm_secfs.c
+ *	- Used to signal when key is on keyring
+ *	- Get the key and enable EVM
+ */
+
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include "evm.h"
+
+static struct dentry *evm_init_tpm;
+
+/**
+ * evm_read_key - read() for <securityfs>/evm
+ *
+ * @filp: file pointer, not actually used
+ * @buf: where to put the result
+ * @count: maximum to send along
+ * @ppos: where to start
+ *
+ * Returns number of bytes read or error code, as appropriate
+ */
+static ssize_t evm_read_key(struct file *filp, char __user *buf,
+			    size_t count, loff_t *ppos)
+{
+	char temp[80];
+	ssize_t rc;
+
+	if (*ppos != 0)
+		return 0;
+
+	sprintf(temp, "%d", evm_initialized);
+	rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
+
+	return rc;
+}
+
+/**
+ * evm_write_key - write() for <securityfs>/evm
+ * @file: file pointer, not actually used
+ * @buf: where to get the data from
+ * @count: bytes sent
+ * @ppos: where to start
+ *
+ * Used to signal that key is on the kernel key ring.
+ * - get the integrity hmac key from the kernel key ring
+ * - create list of hmac protected extended attributes
+ * Returns number of bytes written or error code, as appropriate
+ */
+static ssize_t evm_write_key(struct file *file, const char __user *buf,
+			     size_t count, loff_t *ppos)
+{
+	char temp[80];
+	int i, error;
+
+	if (!capable(CAP_SYS_ADMIN) || evm_initialized)
+		return -EPERM;
+
+	if (count >= sizeof(temp) || count == 0)
+		return -EINVAL;
+
+	if (copy_from_user(temp, buf, count) != 0)
+		return -EFAULT;
+
+	temp[count] = '\0';
+
+	if ((sscanf(temp, "%d", &i) != 1) || (i != 1))
+		return -EINVAL;
+
+	error = evm_init_key();
+	if (!error) {
+		evm_initialized = 1;
+		pr_info("EVM: initialized\n");
+	} else
+		pr_err("EVM: initialization failed\n");
+	return count;
+}
+
+static const struct file_operations evm_key_ops = {
+	.read		= evm_read_key,
+	.write		= evm_write_key,
+};
+
+int __init evm_init_secfs(void)
+{
+	int error = 0;
+
+	evm_init_tpm = securityfs_create_file("evm", S_IRUSR | S_IRGRP,
+					      NULL, NULL, &evm_key_ops);
+	if (!evm_init_tpm || IS_ERR(evm_init_tpm))
+		error = -EFAULT;
+	return error;
+}
+
+void __exit evm_cleanup_secfs(void)
+{
+	if (evm_init_tpm)
+		securityfs_remove(evm_init_tpm);
+}

security/integrity/iint.c

@@ -0,0 +1,171 @@
+/*
+ * Copyright (C) 2008 IBM Corporation
+ *
+ * Authors:
+ * Mimi Zohar <zohar@us.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ *
+ * File: integrity_iint.c
+ *	- implements the integrity hooks: integrity_inode_alloc,
+ *	  integrity_inode_free
+ *	- cache integrity information associated with an inode
+ *	  using a rbtree tree.
+ */
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/rbtree.h>
+#include "integrity.h"
+
+static struct rb_root integrity_iint_tree = RB_ROOT;
+static DEFINE_SPINLOCK(integrity_iint_lock);
+static struct kmem_cache *iint_cache __read_mostly;
+
+int iint_initialized;
+
+/*
+ * __integrity_iint_find - return the iint associated with an inode
+ */
+static struct integrity_iint_cache *__integrity_iint_find(struct inode *inode)
+{
+	struct integrity_iint_cache *iint;
+	struct rb_node *n = integrity_iint_tree.rb_node;
+
+	assert_spin_locked(&integrity_iint_lock);
+
+	while (n) {
+		iint = rb_entry(n, struct integrity_iint_cache, rb_node);
+
+		if (inode < iint->inode)
+			n = n->rb_left;
+		else if (inode > iint->inode)
+			n = n->rb_right;
+		else
+			break;
+	}
+	if (!n)
+		return NULL;
+
+	return iint;
+}
+
+/*
+ * integrity_iint_find - return the iint associated with an inode
+ */
+struct integrity_iint_cache *integrity_iint_find(struct inode *inode)
+{
+	struct integrity_iint_cache *iint;
+
+	if (!IS_IMA(inode))
+		return NULL;
+
+	spin_lock(&integrity_iint_lock);
+	iint = __integrity_iint_find(inode);
+	spin_unlock(&integrity_iint_lock);
+
+	return iint;
+}
+
+static void iint_free(struct integrity_iint_cache *iint)
+{
+	iint->version = 0;
+	iint->flags = 0UL;
+	kmem_cache_free(iint_cache, iint);
+}
+
+/**
+ * integrity_inode_alloc - allocate an iint associated with an inode
+ * @inode: pointer to the inode
+ */
+int integrity_inode_alloc(struct inode *inode)
+{
+	struct rb_node **p;
+	struct rb_node *new_node, *parent = NULL;
+	struct integrity_iint_cache *new_iint, *test_iint;
+	int rc;
+
+	new_iint = kmem_cache_alloc(iint_cache, GFP_NOFS);
+	if (!new_iint)
+		return -ENOMEM;
+
+	new_iint->inode = inode;
+	new_node = &new_iint->rb_node;
+
+	mutex_lock(&inode->i_mutex);	/* i_flags */
+	spin_lock(&integrity_iint_lock);
+
+	p = &integrity_iint_tree.rb_node;
+	while (*p) {
+		parent = *p;
+		test_iint = rb_entry(parent, struct integrity_iint_cache,
+				     rb_node);
+		rc = -EEXIST;
+		if (inode < test_iint->inode)
+			p = &(*p)->rb_left;
+		else if (inode > test_iint->inode)
+			p = &(*p)->rb_right;
+		else
+			goto out_err;
+	}
+
+	inode->i_flags |= S_IMA;
+	rb_link_node(new_node, parent, p);
+	rb_insert_color(new_node, &integrity_iint_tree);
+
+	spin_unlock(&integrity_iint_lock);
+	mutex_unlock(&inode->i_mutex);	/* i_flags */
+
+	return 0;
+out_err:
+	spin_unlock(&integrity_iint_lock);
+	mutex_unlock(&inode->i_mutex);	/* i_flags */
+	iint_free(new_iint);
+
+	return rc;
+}
+
+/**
+ * integrity_inode_free - called on security_inode_free
+ * @inode: pointer to the inode
+ *
+ * Free the integrity information(iint) associated with an inode.
+ */
+void integrity_inode_free(struct inode *inode)
+{
+	struct integrity_iint_cache *iint;
+
+	if (!IS_IMA(inode))
+		return;
+
+	spin_lock(&integrity_iint_lock);
+	iint = __integrity_iint_find(inode);
+	rb_erase(&iint->rb_node, &integrity_iint_tree);
+	spin_unlock(&integrity_iint_lock);
+
+	iint_free(iint);
+}
+
+static void init_once(void *foo)
+{
+	struct integrity_iint_cache *iint = foo;
+
+	memset(iint, 0, sizeof *iint);
+	iint->version = 0;
+	iint->flags = 0UL;
+	mutex_init(&iint->mutex);
+	iint->evm_status = INTEGRITY_UNKNOWN;
+}
+
+static int __init integrity_iintcache_init(void)
+{
+	iint_cache =
+	    kmem_cache_create("iint_cache", sizeof(struct integrity_iint_cache),
+			      0, SLAB_PANIC, init_once);
+	iint_initialized = 1;
+	return 0;
+}
+security_initcall(integrity_iintcache_init);

security/integrity/ima/Kconfig

@@ -3,6 +3,7 @@
 config IMA
 	bool "Integrity Measurement Architecture(IMA)"
 	depends on SECURITY
+	select INTEGRITY
 	select SECURITYFS
 	select CRYPTO
 	select CRYPTO_HMAC

security/integrity/ima/Makefile

@@ -6,4 +6,4 @@
 obj-$(CONFIG_IMA) += ima.o
 
 ima-y := ima_fs.o ima_queue.o ima_init.o ima_main.o ima_crypto.o ima_api.o \
-	 ima_policy.o ima_iint.o ima_audit.o
+	 ima_policy.o ima_audit.o

security/integrity/ima/ima.h

@@ -24,11 +24,13 @@
 #include <linux/tpm.h>
 #include <linux/audit.h>
 
+#include "../integrity.h"
+
 enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_ASCII };
 enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8 };
 
 /* digest size for IMA, fits SHA1 or MD5 */
-#define IMA_DIGEST_SIZE		20
+#define IMA_DIGEST_SIZE		SHA1_DIGEST_SIZE
 #define IMA_EVENT_NAME_LEN_MAX	255
 
 #define IMA_HASH_BITS 9
@@ -96,34 +98,21 @@ static inline unsigned long ima_hash_key(u8 *digest)
 	return hash_long(*digest, IMA_HASH_BITS);
 }
 
-/* iint cache flags */
-#define IMA_MEASURED		0x01
-
-/* integrity data associated with an inode */
-struct ima_iint_cache {
-	struct rb_node rb_node; /* rooted in ima_iint_tree */
-	struct inode *inode;	/* back pointer to inode in question */
-	u64 version;		/* track inode changes */
-	unsigned char flags;
-	u8 digest[IMA_DIGEST_SIZE];
-	struct mutex mutex;	/* protects: version, flags, digest */
-};
-
 /* LIM API function definitions */
 int ima_must_measure(struct inode *inode, int mask, int function);
-int ima_collect_measurement(struct ima_iint_cache *iint, struct file *file);
-void ima_store_measurement(struct ima_iint_cache *iint, struct file *file,
+int ima_collect_measurement(struct integrity_iint_cache *iint,
+			    struct file *file);
+void ima_store_measurement(struct integrity_iint_cache *iint, struct file *file,
 			   const unsigned char *filename);
 int ima_store_template(struct ima_template_entry *entry, int violation,
 		       struct inode *inode);
-void ima_template_show(struct seq_file *m, void *e,
-		       enum ima_show_type show);
+void ima_template_show(struct seq_file *m, void *e, enum ima_show_type show);
 
 /* rbtree tree calls to lookup, insert, delete
  * integrity data associated with an inode.
  */
-struct ima_iint_cache *ima_iint_insert(struct inode *inode);
-struct ima_iint_cache *ima_iint_find(struct inode *inode);
+struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
+struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
 
 /* IMA policy related functions */
 enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK };

security/integrity/ima/ima_api.c

@@ -126,7 +126,8 @@ int ima_must_measure(struct inode *inode, int mask, int function)
  *
  * Return 0 on success, error code otherwise
  */
-int ima_collect_measurement(struct ima_iint_cache *iint, struct file *file)
+int ima_collect_measurement(struct integrity_iint_cache *iint,
+			    struct file *file)
 {
 	int result = -EEXIST;
 
@@ -156,8 +157,8 @@ int ima_collect_measurement(struct ima_iint_cache *iint, struct file *file)
  *
  * Must be called with iint->mutex held.
  */
-void ima_store_measurement(struct ima_iint_cache *iint, struct file *file,
-			   const unsigned char *filename)
+void ima_store_measurement(struct integrity_iint_cache *iint,
+			   struct file *file, const unsigned char *filename)
 {
 	const char *op = "add_template_measure";
 	const char *audit_cause = "ENOMEM";

security/integrity/ima/ima_iint.c

@@ -1,169 +0,0 @@
-/*
- * Copyright (C) 2008 IBM Corporation
- *
- * Authors:
- * Mimi Zohar <zohar@us.ibm.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation, version 2 of the
- * License.
- *
- * File: ima_iint.c
- * 	- implements the IMA hooks: ima_inode_alloc, ima_inode_free
- *	- cache integrity information associated with an inode
- *	  using a rbtree tree.
- */
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/spinlock.h>
-#include <linux/rbtree.h>
-#include "ima.h"
-
-static struct rb_root ima_iint_tree = RB_ROOT;
-static DEFINE_SPINLOCK(ima_iint_lock);
-static struct kmem_cache *iint_cache __read_mostly;
-
-int iint_initialized = 0;
-
-/*
- * __ima_iint_find - return the iint associated with an inode
- */
-static struct ima_iint_cache *__ima_iint_find(struct inode *inode)
-{
-	struct ima_iint_cache *iint;
-	struct rb_node *n = ima_iint_tree.rb_node;
-
-	assert_spin_locked(&ima_iint_lock);
-
-	while (n) {
-		iint = rb_entry(n, struct ima_iint_cache, rb_node);
-
-		if (inode < iint->inode)
-			n = n->rb_left;
-		else if (inode > iint->inode)
-			n = n->rb_right;
-		else
-			break;
-	}
-	if (!n)
-		return NULL;
-
-	return iint;
-}
-
-/*
- * ima_iint_find - return the iint associated with an inode
- */
-struct ima_iint_cache *ima_iint_find(struct inode *inode)
-{
-	struct ima_iint_cache *iint;
-
-	if (!IS_IMA(inode))
-		return NULL;
-
-	spin_lock(&ima_iint_lock);
-	iint = __ima_iint_find(inode);
-	spin_unlock(&ima_iint_lock);
-
-	return iint;
-}
-
-static void iint_free(struct ima_iint_cache *iint)
-{
-	iint->version = 0;
-	iint->flags = 0UL;
-	kmem_cache_free(iint_cache, iint);
-}
-
-/**
- * ima_inode_alloc - allocate an iint associated with an inode
- * @inode: pointer to the inode
- */
-int ima_inode_alloc(struct inode *inode)
-{
-	struct rb_node **p;
-	struct rb_node *new_node, *parent = NULL;
-	struct ima_iint_cache *new_iint, *test_iint;
-	int rc;
-
-	new_iint = kmem_cache_alloc(iint_cache, GFP_NOFS);
-	if (!new_iint)
-		return -ENOMEM;
-
-	new_iint->inode = inode;
-	new_node = &new_iint->rb_node;
-
-	mutex_lock(&inode->i_mutex); /* i_flags */
-	spin_lock(&ima_iint_lock);
-
-	p = &ima_iint_tree.rb_node;
-	while (*p) {
-		parent = *p;
-		test_iint = rb_entry(parent, struct ima_iint_cache, rb_node);
-
-		rc = -EEXIST;
-		if (inode < test_iint->inode)
-			p = &(*p)->rb_left;
-		else if (inode > test_iint->inode)
-			p = &(*p)->rb_right;
-		else
-			goto out_err;
-	}
-
-	inode->i_flags |= S_IMA;
-	rb_link_node(new_node, parent, p);
-	rb_insert_color(new_node, &ima_iint_tree);
-
-	spin_unlock(&ima_iint_lock);
-	mutex_unlock(&inode->i_mutex); /* i_flags */
-
-	return 0;
-out_err:
-	spin_unlock(&ima_iint_lock);
-	mutex_unlock(&inode->i_mutex); /* i_flags */
-	iint_free(new_iint);
-
-	return rc;
-}
-
-/**
- * ima_inode_free - called on security_inode_free
- * @inode: pointer to the inode
- *
- * Free the integrity information(iint) associated with an inode.
- */
-void ima_inode_free(struct inode *inode)
-{
-	struct ima_iint_cache *iint;
-
-	if (!IS_IMA(inode))
-		return;
-
-	spin_lock(&ima_iint_lock);
-	iint = __ima_iint_find(inode);
-	rb_erase(&iint->rb_node, &ima_iint_tree);
-	spin_unlock(&ima_iint_lock);
-
-	iint_free(iint);
-}
-
-static void init_once(void *foo)
-{
-	struct ima_iint_cache *iint = foo;
-
-	memset(iint, 0, sizeof *iint);
-	iint->version = 0;
-	iint->flags = 0UL;
-	mutex_init(&iint->mutex);
-}
-
-static int __init ima_iintcache_init(void)
-{
-	iint_cache =
-	    kmem_cache_create("iint_cache", sizeof(struct ima_iint_cache), 0,
-			      SLAB_PANIC, init_once);
-	iint_initialized = 1;
-	return 0;
-}
-security_initcall(ima_iintcache_init);

security/integrity/ima/ima_main.c

@@ -82,7 +82,7 @@ out:
 				  "open_writers");
 }
 
-static void ima_check_last_writer(struct ima_iint_cache *iint,
+static void ima_check_last_writer(struct integrity_iint_cache *iint,
 				  struct inode *inode,
 				  struct file *file)
 {
@@ -105,12 +105,12 @@ static void ima_check_last_writer(struct ima_iint_cache *iint,
 void ima_file_free(struct file *file)
 {
 	struct inode *inode = file->f_dentry->d_inode;
-	struct ima_iint_cache *iint;
+	struct integrity_iint_cache *iint;
 
 	if (!iint_initialized || !S_ISREG(inode->i_mode))
 		return;
 
-	iint = ima_iint_find(inode);
+	iint = integrity_iint_find(inode);
 	if (!iint)
 		return;
 
@@ -121,7 +121,7 @@ static int process_measurement(struct file *file, const unsigned char *filename,
 			       int mask, int function)
 {
 	struct inode *inode = file->f_dentry->d_inode;
-	struct ima_iint_cache *iint;
+	struct integrity_iint_cache *iint;
 	int rc = 0;
 
 	if (!ima_initialized || !S_ISREG(inode->i_mode))
@@ -131,9 +131,9 @@ static int process_measurement(struct file *file, const unsigned char *filename,
 	if (rc != 0)
 		return rc;
 retry:
-	iint = ima_iint_find(inode);
+	iint = integrity_iint_find(inode);
 	if (!iint) {
-		rc = ima_inode_alloc(inode);
+		rc = integrity_inode_alloc(inode);
 		if (!rc || rc == -EEXIST)
 			goto retry;
 		return rc;

security/integrity/integrity.h

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2009-2010 IBM Corporation
+ *
+ * Authors:
+ * Mimi Zohar <zohar@us.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/integrity.h>
+#include <crypto/sha.h>
+
+/* iint cache flags */
+#define IMA_MEASURED		0x01
+
+enum evm_ima_xattr_type {
+	IMA_XATTR_DIGEST = 0x01,
+	EVM_XATTR_HMAC,
+	EVM_IMA_XATTR_DIGSIG,
+};
+
+struct evm_ima_xattr_data {
+	u8 type;
+	u8 digest[SHA1_DIGEST_SIZE];
+}  __attribute__((packed));
+
+/* integrity data associated with an inode */
+struct integrity_iint_cache {
+	struct rb_node rb_node; /* rooted in integrity_iint_tree */
+	struct inode *inode;	/* back pointer to inode in question */
+	u64 version;		/* track inode changes */
+	unsigned char flags;
+	u8 digest[SHA1_DIGEST_SIZE];
+	struct mutex mutex;	/* protects: version, flags, digest */
+	enum integrity_status evm_status;
+};
+
+/* rbtree tree calls to lookup, insert, delete
+ * integrity data associated with an inode.
+ */
+struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
+struct integrity_iint_cache *integrity_iint_find(struct inode *inode);

security/security.c

@@ -16,7 +16,11 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/security.h>
+#include <linux/integrity.h>
 #include <linux/ima.h>
+#include <linux/evm.h>
+
+#define MAX_LSM_EVM_XATTR	2
 
 /* Boot-time LSM user choice */
 static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] =
@@ -334,20 +338,57 @@ int security_inode_alloc(struct inode *inode)
 
 void security_inode_free(struct inode *inode)
 {
-	ima_inode_free(inode);
+	integrity_inode_free(inode);
 	security_ops->inode_free_security(inode);
 }
 
 int security_inode_init_security(struct inode *inode, struct inode *dir,
-				 const struct qstr *qstr, char **name,
-				 void **value, size_t *len)
+				 const struct qstr *qstr,
+				 const initxattrs initxattrs, void *fs_data)
+{
+	struct xattr new_xattrs[MAX_LSM_EVM_XATTR + 1];
+	struct xattr *lsm_xattr, *evm_xattr, *xattr;
+	int ret;
+
+	if (unlikely(IS_PRIVATE(inode)))
+		return -EOPNOTSUPP;
+
+	memset(new_xattrs, 0, sizeof new_xattrs);
+	if (!initxattrs)
+		return security_ops->inode_init_security(inode, dir, qstr,
+							 NULL, NULL, NULL);
+	lsm_xattr = new_xattrs;
+	ret = security_ops->inode_init_security(inode, dir, qstr,
+						&lsm_xattr->name,
+						&lsm_xattr->value,
+						&lsm_xattr->value_len);
+	if (ret)
+		goto out;
+
+	evm_xattr = lsm_xattr + 1;
+	ret = evm_inode_init_security(inode, lsm_xattr, evm_xattr);
+	if (ret)
+		goto out;
+	ret = initxattrs(inode, new_xattrs, fs_data);
+out:
+	for (xattr = new_xattrs; xattr->name != NULL; xattr++) {
+		kfree(xattr->name);
+		kfree(xattr->value);
+	}
+	return (ret == -EOPNOTSUPP) ? 0 : ret;
+}
+EXPORT_SYMBOL(security_inode_init_security);
+
+int security_old_inode_init_security(struct inode *inode, struct inode *dir,
+				     const struct qstr *qstr, char **name,
+				     void **value, size_t *len)
 {
 	if (unlikely(IS_PRIVATE(inode)))
 		return -EOPNOTSUPP;
 	return security_ops->inode_init_security(inode, dir, qstr, name, value,
 						 len);
 }
-EXPORT_SYMBOL(security_inode_init_security);
+EXPORT_SYMBOL(security_old_inode_init_security);
 
 #ifdef CONFIG_SECURITY_PATH
 int security_path_mknod(struct path *dir, struct dentry *dentry, int mode,
@@ -523,9 +564,14 @@ int security_inode_permission(struct inode *inode, int mask)
 
 int security_inode_setattr(struct dentry *dentry, struct iattr *attr)
 {
+	int ret;
+
 	if (unlikely(IS_PRIVATE(dentry->d_inode)))
 		return 0;
-	return security_ops->inode_setattr(dentry, attr);
+	ret = security_ops->inode_setattr(dentry, attr);
+	if (ret)
+		return ret;
+	return evm_inode_setattr(dentry, attr);
 }
 EXPORT_SYMBOL_GPL(security_inode_setattr);
 
@@ -539,9 +585,14 @@ int security_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
 int security_inode_setxattr(struct dentry *dentry, const char *name,
 			    const void *value, size_t size, int flags)
 {
+	int ret;
+
 	if (unlikely(IS_PRIVATE(dentry->d_inode)))
 		return 0;
-	return security_ops->inode_setxattr(dentry, name, value, size, flags);
+	ret = security_ops->inode_setxattr(dentry, name, value, size, flags);
+	if (ret)
+		return ret;
+	return evm_inode_setxattr(dentry, name, value, size);
 }
 
 void security_inode_post_setxattr(struct dentry *dentry, const char *name,
@@ -550,6 +601,7 @@ void security_inode_post_setxattr(struct dentry *dentry, const char *name,
 	if (unlikely(IS_PRIVATE(dentry->d_inode)))
 		return;
 	security_ops->inode_post_setxattr(dentry, name, value, size, flags);
+	evm_inode_post_setxattr(dentry, name, value, size);
 }
 
 int security_inode_getxattr(struct dentry *dentry, const char *name)
@@ -568,9 +620,14 @@ int security_inode_listxattr(struct dentry *dentry)
 
 int security_inode_removexattr(struct dentry *dentry, const char *name)
 {
+	int ret;
+
 	if (unlikely(IS_PRIVATE(dentry->d_inode)))
 		return 0;
-	return security_ops->inode_removexattr(dentry, name);
+	ret = security_ops->inode_removexattr(dentry, name);
+	if (ret)
+		return ret;
+	return evm_inode_removexattr(dentry, name);
 }
 
 int security_inode_need_killpriv(struct dentry *dentry)