Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6

* 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (38 commits)
  direct I/O fallback sync simplification
  ocfs: stop using do_sync_mapping_range
  cleanup blockdev_direct_IO locking
  make generic_acl slightly more generic
  sanitize xattr handler prototypes
  libfs: move EXPORT_SYMBOL for d_alloc_name
  vfs: force reval of target when following LAST_BIND symlinks (try #7)
  ima: limit imbalance msg
  Untangling ima mess, part 3: kill dead code in ima
  Untangling ima mess, part 2: deal with counters
  Untangling ima mess, part 1: alloc_file()
  O_TRUNC open shouldn't fail after file truncation
  ima: call ima_inode_free ima_inode_free
  IMA: clean up the IMA counts updating code
  ima: only insert at inode creation time
  ima: valid return code from ima_inode_alloc
  fs: move get_empty_filp() deffinition to internal.h
  Sanitize exec_permission_lite()
  Kill cached_lookup() and real_lookup()
  Kill path_lookup_open()
  ...

Trivial conflicts in fs/direct-io.c

3 files changed, 115 insertions, 151 deletions

diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 165eb5397ea..c41afe6639a 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -97,7 +97,6 @@ static inline unsigned long ima_hash_key(u8 *digest)
 
 /* iint cache flags */
 #define IMA_MEASURED            1
-#define IMA_IINT_DUMP_STACK     512
 
 /* integrity data associated with an inode */
 struct ima_iint_cache {
@@ -128,8 +127,6 @@ void ima_template_show(struct seq_file *m, void *e,
  */
 struct ima_iint_cache *ima_iint_insert(struct inode *inode);
 struct ima_iint_cache *ima_iint_find_get(struct inode *inode);
-struct ima_iint_cache *ima_iint_find_insert_get(struct inode *inode);
-void ima_iint_delete(struct inode *inode);
 void iint_free(struct kref *kref);
 void iint_rcu_free(struct rcu_head *rcu);
 
diff --git a/security/integrity/ima/ima_iint.c b/security/integrity/ima/ima_iint.c
index a4e2b1dac94..fa592ff1ac1 100644
--- a/security/integrity/ima/ima_iint.c
+++ b/security/integrity/ima/ima_iint.c
@@ -19,8 +19,6 @@
 #include <linux/radix-tree.h>
 #include "ima.h"
 
-#define ima_iint_delete ima_inode_free
-
 RADIX_TREE(ima_iint_store, GFP_ATOMIC);
 DEFINE_SPINLOCK(ima_iint_lock);
 
@@ -45,22 +43,21 @@ out:
         return iint;
 }
 
-/* Allocate memory for the iint associated with the inode
- * from the iint_cache slab, initialize the iint, and
- * insert it into the radix tree.
- *
- * On success return a pointer to the iint; on failure return NULL.
+/**
+ * ima_inode_alloc - allocate an iint associated with an inode
+ * @inode: pointer to the inode
  */
-struct ima_iint_cache *ima_iint_insert(struct inode *inode)
+int ima_inode_alloc(struct inode *inode)
 {
         struct ima_iint_cache *iint = NULL;
         int rc = 0;
 
         if (!ima_initialized)
-                return iint;
+                return 0;
+
         iint = kmem_cache_alloc(iint_cache, GFP_NOFS);
         if (!iint)
-                return iint;
+                return -ENOMEM;
 
         rc = radix_tree_preload(GFP_NOFS);
         if (rc < 0)
@@ -70,65 +67,13 @@ struct ima_iint_cache *ima_iint_insert(struct inode *inode)
         rc = radix_tree_insert(&ima_iint_store, (unsigned long)inode, iint);
         spin_unlock(&ima_iint_lock);
 out:
-        if (rc < 0) {
+        if (rc < 0)
                 kmem_cache_free(iint_cache, iint);
-                if (rc == -EEXIST) {
-                        spin_lock(&ima_iint_lock);
-                        iint = radix_tree_lookup(&ima_iint_store,
-                                                 (unsigned long)inode);
-                        spin_unlock(&ima_iint_lock);
-                } else
-                        iint = NULL;
-        }
-        radix_tree_preload_end();
-        return iint;
-}
-
-/**
- * ima_inode_alloc - allocate an iint associated with an inode
- * @inode: pointer to the inode
- *
- * Return 0 on success, 1 on failure.
- */
-int ima_inode_alloc(struct inode *inode)
-{
-        struct ima_iint_cache *iint;
-
-        if (!ima_initialized)
-                return 0;
-
-        iint = ima_iint_insert(inode);
-        if (!iint)
-                return 1;
-        return 0;
-}
-
-/* ima_iint_find_insert_get - get the iint associated with an inode
- *
- * Most insertions are done at inode_alloc, except those allocated
- * before late_initcall. When the iint does not exist, allocate it,
- * initialize and insert it, and increment the iint refcount.
- *
- * (Can't initialize at security_initcall before any inodes are
- * allocated, got to wait at least until proc_init.)
- *
- *  Return the iint.
- */
-struct ima_iint_cache *ima_iint_find_insert_get(struct inode *inode)
-{
-        struct ima_iint_cache *iint = NULL;
 
-        iint = ima_iint_find_get(inode);
-        if (iint)
-                return iint;
-
-        iint = ima_iint_insert(inode);
-        if (iint)
-                kref_get(&iint->refcount);
+        radix_tree_preload_end();
 
-        return iint;
+        return rc;
 }
-EXPORT_SYMBOL_GPL(ima_iint_find_insert_get);
 
 /* iint_free - called when the iint refcount goes to zero */
 void iint_free(struct kref *kref)
@@ -164,12 +109,12 @@ void iint_rcu_free(struct rcu_head *rcu_head)
 }
 
 /**
- * ima_iint_delete - called on integrity_inode_free
+ * ima_inode_free - called on security_inode_free
  * @inode: pointer to the inode
  *
  * Free the integrity information(iint) associated with an inode.
  */
-void ima_iint_delete(struct inode *inode)
+void ima_inode_free(struct inode *inode)
 {
         struct ima_iint_cache *iint;
 
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index b85e61bcf24..a89f44d5e03 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -13,8 +13,8 @@
  * License.
  *
  * File: ima_main.c
- *             implements the IMA hooks: ima_bprm_check, ima_file_mmap,
- *             and ima_path_check.
+ *      implements the IMA hooks: ima_bprm_check, ima_file_mmap,
+ *      and ima_path_check.
  */
 #include <linux/module.h>
 #include <linux/file.h>
@@ -35,6 +35,100 @@ static int __init hash_setup(char *str)
 }
 __setup("ima_hash=", hash_setup);
 
+struct ima_imbalance {
+        struct hlist_node node;
+        unsigned long fsmagic;
+};
+
+/*
+ * ima_limit_imbalance - emit one imbalance message per filesystem type
+ *
+ * Maintain list of filesystem types that do not measure files properly.
+ * Return false if unknown, true if known.
+ */
+static bool ima_limit_imbalance(struct file *file)
+{
+        static DEFINE_SPINLOCK(ima_imbalance_lock);
+        static HLIST_HEAD(ima_imbalance_list);
+
+        struct super_block *sb = file->f_dentry->d_sb;
+        struct ima_imbalance *entry;
+        struct hlist_node *node;
+        bool found = false;
+
+        rcu_read_lock();
+        hlist_for_each_entry_rcu(entry, node, &ima_imbalance_list, node) {
+                if (entry->fsmagic == sb->s_magic) {
+                        found = true;
+                        break;
+                }
+        }
+        rcu_read_unlock();
+        if (found)
+                goto out;
+
+        entry = kmalloc(sizeof(*entry), GFP_NOFS);
+        if (!entry)
+                goto out;
+        entry->fsmagic = sb->s_magic;
+        spin_lock(&ima_imbalance_lock);
+        /*
+         * we could have raced and something else might have added this fs
+         * to the list, but we don't really care
+         */
+        hlist_add_head_rcu(&entry->node, &ima_imbalance_list);
+        spin_unlock(&ima_imbalance_lock);
+        printk(KERN_INFO "IMA: unmeasured files on fsmagic: %lX\n",
+               entry->fsmagic);
+out:
+        return found;
+}
+
+/*
+ * Update the counts given an fmode_t
+ */
+static void ima_inc_counts(struct ima_iint_cache *iint, fmode_t mode)
+{
+        BUG_ON(!mutex_is_locked(&iint->mutex));
+
+        iint->opencount++;
+        if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
+                iint->readcount++;
+        if (mode & FMODE_WRITE)
+                iint->writecount++;
+}
+
+/*
+ * Decrement ima counts
+ */
+static void ima_dec_counts(struct ima_iint_cache *iint, struct inode *inode,
+                           struct file *file)
+{
+        mode_t mode = file->f_mode;
+        BUG_ON(!mutex_is_locked(&iint->mutex));
+
+        iint->opencount--;
+        if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
+                iint->readcount--;
+        if (mode & FMODE_WRITE) {
+                iint->writecount--;
+                if (iint->writecount == 0) {
+                        if (iint->version != inode->i_version)
+                                iint->flags &= ~IMA_MEASURED;
+                }
+        }
+
+        if (((iint->opencount < 0) ||
+             (iint->readcount < 0) ||
+             (iint->writecount < 0)) &&
+            !ima_limit_imbalance(file)) {
+                printk(KERN_INFO "%s: open/free imbalance (r:%ld w:%ld o:%ld)\n",
+                       __FUNCTION__, iint->readcount, iint->writecount,
+                       iint->opencount);
+                dump_stack();
+        }
+}
+
 /**
  * ima_file_free - called on __fput()
  * @file: pointer to file structure being freed
@@ -54,29 +148,7 @@ void ima_file_free(struct file *file)
                 return;
 
         mutex_lock(&iint->mutex);
-        if (iint->opencount <= 0) {
-                printk(KERN_INFO
-                       "%s: %s open/free imbalance (r:%ld w:%ld o:%ld f:%ld)\n",
-                       __FUNCTION__, file->f_dentry->d_name.name,
-                       iint->readcount, iint->writecount,
-                       iint->opencount, atomic_long_read(&file->f_count));
-                if (!(iint->flags & IMA_IINT_DUMP_STACK)) {
-                        dump_stack();
-                        iint->flags |= IMA_IINT_DUMP_STACK;
-                }
-        }
-        iint->opencount--;
-
-        if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
-                iint->readcount--;
-
-        if (file->f_mode & FMODE_WRITE) {
-                iint->writecount--;
-                if (iint->writecount == 0) {
-                        if (iint->version != inode->i_version)
-                                iint->flags &= ~IMA_MEASURED;
-                }
-        }
+        ima_dec_counts(iint, inode, file);
         mutex_unlock(&iint->mutex);
         kref_put(&iint->refcount, iint_free);
 }
@@ -116,8 +188,7 @@ static int get_path_measurement(struct ima_iint_cache *iint, struct file *file,
 {
         int rc = 0;
 
-        iint->opencount++;
-        iint->readcount++;
+        ima_inc_counts(iint, file->f_mode);
 
         rc = ima_collect_measurement(iint, file);
         if (!rc)
@@ -125,15 +196,6 @@ static int get_path_measurement(struct ima_iint_cache *iint, struct file *file,
         return rc;
 }
 
-static void ima_update_counts(struct ima_iint_cache *iint, int mask)
-{
-        iint->opencount++;
-        if ((mask & MAY_WRITE) || (mask == 0))
-                iint->writecount++;
-        else if (mask & (MAY_READ | MAY_EXEC))
-                iint->readcount++;
-}
-
 /**
  * ima_path_check - based on policy, collect/store measurement.
  * @path: contains a pointer to the path to be measured
@@ -152,7 +214,7 @@ static void ima_update_counts(struct ima_iint_cache *iint, int mask)
  * Always return 0 and audit dentry_open failures.
  * (Return code will be based upon measurement appraisal.)
  */
-int ima_path_check(struct path *path, int mask, int update_counts)
+int ima_path_check(struct path *path, int mask)
 {
         struct inode *inode = path->dentry->d_inode;
         struct ima_iint_cache *iint;
@@ -161,13 +223,11 @@ int ima_path_check(struct path *path, int mask, int update_counts)
 
         if (!ima_initialized || !S_ISREG(inode->i_mode))
                 return 0;
-        iint = ima_iint_find_insert_get(inode);
+        iint = ima_iint_find_get(inode);
         if (!iint)
                 return 0;
 
         mutex_lock(&iint->mutex);
-        if (update_counts)
-                ima_update_counts(iint, mask);
 
         rc = ima_must_measure(iint, inode, MAY_READ, PATH_CHECK);
         if (rc < 0)
@@ -219,7 +279,7 @@ static int process_measurement(struct file *file, const unsigned char *filename,
 
         if (!ima_initialized || !S_ISREG(inode->i_mode))
                 return 0;
-        iint = ima_iint_find_insert_get(inode);
+        iint = ima_iint_find_get(inode);
         if (!iint)
                 return -ENOMEM;
 
@@ -238,39 +298,6 @@ out:
 }
 
 /*
- * ima_counts_put - decrement file counts
- *
- * File counts are incremented in ima_path_check. On file open
- * error, such as ETXTBSY, decrement the counts to prevent
- * unnecessary imbalance messages.
- */
-void ima_counts_put(struct path *path, int mask)
-{
-        struct inode *inode = path->dentry->d_inode;
-        struct ima_iint_cache *iint;
-
-        /* The inode may already have been freed, freeing the iint
-         * with it. Verify the inode is not NULL before dereferencing
-         * it.
-         */
-        if (!ima_initialized || !inode || !S_ISREG(inode->i_mode))
-                return;
-        iint = ima_iint_find_insert_get(inode);
-        if (!iint)
-                return;
-
-        mutex_lock(&iint->mutex);
-        iint->opencount--;
-        if ((mask & MAY_WRITE) || (mask == 0))
-                iint->writecount--;
-        else if (mask & (MAY_READ | MAY_EXEC))
-                iint->readcount--;
-        mutex_unlock(&iint->mutex);
-
-        kref_put(&iint->refcount, iint_free);
-}
-
-/*
  * ima_counts_get - increment file counts
  *
  * - for IPC shm and shmat file.
@@ -286,16 +313,11 @@ void ima_counts_get(struct file *file)
 
         if (!ima_initialized || !S_ISREG(inode->i_mode))
                 return;
-        iint = ima_iint_find_insert_get(inode);
+        iint = ima_iint_find_get(inode);
         if (!iint)
                 return;
         mutex_lock(&iint->mutex);
-        iint->opencount++;
-        if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
-                iint->readcount++;
-
-        if (file->f_mode & FMODE_WRITE)
-                iint->writecount++;
+        ima_inc_counts(iint, file->f_mode);
         mutex_unlock(&iint->mutex);
 
         kref_put(&iint->refcount, iint_free);