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IMA: convert i_readcount to atomic

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

Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
Acked-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Mimi Zohar 2010-11-02 10:10:56 -04:00
parent 75a25637bf
commit a68a27b6f2
3 changed files with 11 additions and 10 deletions
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3
include/linux/fs.h
View file

@ -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

7
security/integrity/ima/ima_iint.c
View file

@ -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;

11
security/integrity/ima/ima_main.c
View file

@ -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);
}
}