linux-kernel - [PATCH 1/4] IMA: define readcount functions

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Date:	Thu, 28 Oct 2010 18:02:02 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, hch@...radead.org,
	warthog9@...nel.org, david@...morbit.com, jmorris@...ei.org,
	kyle@...artin.ca, hpa@...or.com, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, mingo@...e.hu, eparis@...hat.com,
	viro@...iv.linux.org.uk, Matthew Wilcox <matthew@....cx>,
	Mimi Zohar <zohar@...ibm.com>
Subject: [PATCH 1/4] IMA: define readcount functions

Define iget/iput_readcount() functions to be called from the VFS layer.

Signed-off-by: Mimi Zohar <zohar@...ibm.com>
---
 include/linux/fs.h                     |   13 +++++++++++++
 security/integrity/ima/Makefile        |    2 +-
 security/integrity/ima/ima_readcount.c |   32 ++++++++++++++++++++++++++++++++
 3 files changed, 46 insertions(+), 1 deletions(-)
 create mode 100644 security/integrity/ima/ima_readcount.c

diff --git a/include/linux/fs.h b/include/linux/fs.h
index bb20373..310d467 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2142,6 +2142,19 @@ static inline void allow_write_access(struct file *file)
 	if (file)
 		atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
 }
+#ifdef CONFIG_IMA
+extern void iput_readcount(struct inode *inode);
+extern void iget_readcount(struct inode *inode);
+#else
+static inline void iput_readcount(struct inode *inode)
+{
+	return;
+}
+static inline void iget_readcount(struct inode *inode)
+{
+	return;
+}
+#endif
 extern int do_pipe_flags(int *, int);
 extern struct file *create_read_pipe(struct file *f, int flags);
 extern struct file *create_write_pipe(int flags);
diff --git a/security/integrity/ima/Makefile b/security/integrity/ima/Makefile
index 787c4cb..131eb1f 100644
--- a/security/integrity/ima/Makefile
+++ b/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_iint.o ima_audit.o ima_readcount.o
diff --git a/security/integrity/ima/ima_readcount.c b/security/integrity/ima/ima_readcount.c
new file mode 100644
index 0000000..6ee1163
--- /dev/null
+++ b/security/integrity/ima/ima_readcount.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2010 IBM Corporation
+ *
+ * Authors:
+ * Mimi Zohar <zohar@...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/module.h>
+#include <linux/spinlock.h>
+#include <linux/fs.h>
+
+void iput_readcount(struct inode *inode)
+{
+	spin_lock(&inode->i_lock);
+	if (unlikely(inode->i_readcount == 0))
+		printk(KERN_INFO "i_readcount: imbalance ino %ld\n",
+		       inode->i_ino);
+	else
+		inode->i_readcount--;
+	spin_unlock(&inode->i_lock);
+}
+
+void iget_readcount(struct inode *inode)
+{
+	spin_lock(&inode->i_lock);
+	inode->i_readcount++;
+	spin_unlock(&inode->i_lock);
+}
-- 
1.7.2.2

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