IMA: convert i_readcount to atomic
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>
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@ -794,8 +794,7 @@ struct inode {
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#endif
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#ifdef CONFIG_IMA
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/* protected by i_lock */
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unsigned int i_readcount; /* struct files open RO */
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atomic_t i_readcount; /* struct files open RO */
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#endif
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atomic_t i_writecount;
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#ifdef CONFIG_SECURITY
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@ -137,10 +137,11 @@ void ima_inode_free(struct inode *inode)
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{
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struct ima_iint_cache *iint;
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if (inode->i_readcount)
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printk(KERN_INFO "%s: readcount: %u\n", __func__, inode->i_readcount);
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if (atomic_read(&inode->i_readcount))
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printk(KERN_INFO "%s: readcount: %u\n", __func__,
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atomic_read(&inode->i_readcount));
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inode->i_readcount = 0;
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atomic_set(&inode->i_readcount, 0);
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if (!IS_IMA(inode))
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return;
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@ -113,7 +113,7 @@ void ima_counts_get(struct file *file)
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goto out;
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if (mode & FMODE_WRITE) {
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if (inode->i_readcount && IS_IMA(inode))
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if (atomic_read(&inode->i_readcount) && IS_IMA(inode))
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send_tomtou = true;
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goto out;
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}
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@ -127,7 +127,7 @@ void ima_counts_get(struct file *file)
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out:
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/* remember the vfs deals with i_writecount */
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if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
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inode->i_readcount++;
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atomic_inc(&inode->i_readcount);
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spin_unlock(&inode->i_lock);
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@ -149,15 +149,16 @@ static void ima_dec_counts(struct inode *inode, struct file *file)
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assert_spin_locked(&inode->i_lock);
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if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
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if (unlikely(inode->i_readcount == 0)) {
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if (unlikely(atomic_read(&inode->i_readcount) == 0)) {
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if (!ima_limit_imbalance(file)) {
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printk(KERN_INFO "%s: open/free imbalance (r:%u)\n",
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__func__, inode->i_readcount);
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__func__,
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atomic_read(&inode->i_readcount));
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dump_stack();
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}
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return;
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}
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inode->i_readcount--;
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atomic_dec(&inode->i_readcount);
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}
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}
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