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Commit a68a27b6 authored by Mimi Zohar's avatar Mimi Zohar
Browse files

IMA: convert i_readcount to atomic 



Convert the inode's i_readcount from an unsigned int to atomic.

Signed-off-by: default avatarMimi Zohar <zohar@us.ibm.com>
Acked-by: default avatarEric Paris <eparis@redhat.com>
parent 75a25637

include/linux/fs.h

+1 −2
Original line number Diff line number Diff line
@@ -794,8 +794,7 @@ struct inode { 
#endif



#ifdef CONFIG_IMA

	/* protected by i_lock */

	unsigned int		i_readcount; /* struct files open RO */

	atomic_t		i_readcount; /* struct files open RO */

#endif

	atomic_t		i_writecount;

#ifdef CONFIG_SECURITY

security/integrity/ima/ima_iint.c

+4 −3
Original line number Diff line number Diff line
@@ -137,10 +137,11 @@ void ima_inode_free(struct inode *inode) 
{

	struct ima_iint_cache *iint;



	if (inode->i_readcount)

		printk(KERN_INFO "%s: readcount: %u\n", __func__, inode->i_readcount);

	if (atomic_read(&inode->i_readcount))

		printk(KERN_INFO "%s: readcount: %u\n", __func__,

		       atomic_read(&inode->i_readcount));



	inode->i_readcount = 0;

	atomic_set(&inode->i_readcount, 0);



	if (!IS_IMA(inode))

		return;

security/integrity/ima/ima_main.c

+6 −5
Original line number Diff line number Diff line
@@ -113,7 +113,7 @@ void ima_counts_get(struct file *file) 
		goto out;



	if (mode & FMODE_WRITE) {

		if (inode->i_readcount && IS_IMA(inode))

		if (atomic_read(&inode->i_readcount) && IS_IMA(inode))

			send_tomtou = true;

		goto out;

	}
@@ -127,7 +127,7 @@ void ima_counts_get(struct file *file) 
out:

	/* remember the vfs deals with i_writecount */

	if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)

		inode->i_readcount++;

		atomic_inc(&inode->i_readcount);



	spin_unlock(&inode->i_lock);
@@ -149,15 +149,16 @@ static void ima_dec_counts(struct inode *inode, struct file *file) 
	assert_spin_locked(&inode->i_lock);



	if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {

		if (unlikely(inode->i_readcount == 0)) {

		if (unlikely(atomic_read(&inode->i_readcount) == 0)) {

			if (!ima_limit_imbalance(file)) {

				printk(KERN_INFO "%s: open/free imbalance (r:%u)\n",

				       __func__, inode->i_readcount);

				       __func__,

				       atomic_read(&inode->i_readcount));

				dump_stack();

			}

			return;

		}

		inode->i_readcount--;

		atomic_dec(&inode->i_readcount);

	}

}