5 files changed, 14 insertions, 27 deletions

diff --git a/fs/file_table.c b/fs/file_table.c
index c3dee381f1b..0c724deb46f 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -190,7 +190,8 @@ struct file *alloc_file(struct path *path, fmode_t mode,
                 file_take_write(file);
                 WARN_ON(mnt_clone_write(path->mnt));
         }
-        ima_counts_get(file);
+        if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
+                i_readcount_inc(path->dentry->d_inode);
         return file;
 }
 EXPORT_SYMBOL(alloc_file);
@@ -251,6 +252,8 @@ static void __fput(struct file *file)
         fops_put(file->f_op);
         put_pid(file->f_owner.pid);
         file_sb_list_del(file);
+        if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
+                i_readcount_dec(inode);
         if (file->f_mode & FMODE_WRITE)
                 drop_file_write_access(file);
         file->f_path.dentry = NULL;
diff --git a/fs/open.c b/fs/open.c
index 4197b9ed023..0d485c50bb9 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -688,7 +688,8 @@ static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
                 if (error)
                         goto cleanup_all;
         }
-        ima_counts_get(f);
+        if ((f->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
+                i_readcount_inc(inode);
 
         f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
 
diff --git a/include/linux/ima.h b/include/linux/ima.h
index 975837e7d6c..09e6e62f995 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -20,7 +20,6 @@ extern void ima_inode_free(struct inode *inode);
 extern int ima_file_check(struct file *file, int mask);
 extern void ima_file_free(struct file *file);
 extern int ima_file_mmap(struct file *file, unsigned long prot);
-extern void ima_counts_get(struct file *file);
 
 #else
 static inline int ima_bprm_check(struct linux_binprm *bprm)
@@ -53,10 +52,5 @@ static inline int ima_file_mmap(struct file *file, unsigned long prot)
         return 0;
 }
 
-static inline void ima_counts_get(struct file *file)
-{
-        return;
-}
-
 #endif /* CONFIG_IMA_H */
 #endif /* _LINUX_IMA_H */
diff --git a/security/integrity/ima/ima_iint.c b/security/integrity/ima/ima_iint.c
index f0053552fd5..68efe3b8d99 100644
--- a/security/integrity/ima/ima_iint.c
+++ b/security/integrity/ima/ima_iint.c
@@ -141,8 +141,6 @@ void ima_inode_free(struct inode *inode)
                 printk(KERN_INFO "%s: readcount: %u\n", __func__,
                        atomic_read(&inode->i_readcount));
 
-        atomic_set(&inode->i_readcount, 0);
-
         if (!IS_IMA(inode))
                 return;
 
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 6e8cb931b8f..69b4856af4d 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -86,17 +86,16 @@ out:
 }
 
 /*
- * ima_counts_get - increment file counts
+ * ima_rdwr_violation_check
  *
- * Maintain read/write counters for all files, but only
- * invalidate the PCR for measured files:
+ * Only invalidate the PCR for measured files:
  *      - Opening a file for write when already open for read,
  *        results in a time of measure, time of use (ToMToU) error.
  *      - Opening a file for read when already open for write,
  *        could result in a file measurement error.
  *
  */
-void ima_counts_get(struct file *file)
+static void ima_rdwr_violation_check(struct file *file)
 {
         struct dentry *dentry = file->f_path.dentry;
         struct inode *inode = dentry->d_inode;
@@ -104,13 +103,10 @@ void ima_counts_get(struct file *file)
         int rc;
         bool send_tomtou = false, send_writers = false;
 
-        if (!S_ISREG(inode->i_mode))
+        if (!S_ISREG(inode->i_mode) || !ima_initialized)
                 return;
 
-        spin_lock(&inode->i_lock);
-
-        if (!ima_initialized)
-                goto out;
+        mutex_lock(&inode->i_mutex);    /* file metadata: permissions, xattr */
 
         if (mode & FMODE_WRITE) {
                 if (atomic_read(&inode->i_readcount) && IS_IMA(inode))
@@ -125,11 +121,7 @@ void ima_counts_get(struct file *file)
         if (atomic_read(&inode->i_writecount) > 0)
                 send_writers = true;
 out:
-        /* remember the vfs deals with i_writecount */
-        if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
-                atomic_inc(&inode->i_readcount);
-
-        spin_unlock(&inode->i_lock);
+        mutex_unlock(&inode->i_mutex);
 
         if (send_tomtou)
                 ima_add_violation(inode, dentry->d_name.name, "invalid_pcr",
@@ -158,7 +150,6 @@ static void ima_dec_counts(struct inode *inode, struct file *file)
                         }
                         return;
                 }
-                atomic_dec(&inode->i_readcount);
         }
 }
 
@@ -203,8 +194,7 @@ static void ima_file_free_noiint(struct inode *inode, struct file *file)
  * ima_file_free - called on __fput()
  * @file: pointer to file structure being freed
  *
- * Flag files that changed, based on i_version;
- * and decrement the i_readcount.
+ * Flag files that changed, based on i_version
  */
 void ima_file_free(struct file *file)
 {
@@ -318,6 +308,7 @@ int ima_file_check(struct file *file, int mask)
 {
         int rc;
 
+        ima_rdwr_violation_check(file);
         rc = process_measurement(file, file->f_dentry->d_name.name,
                                  mask & (MAY_READ | MAY_WRITE | MAY_EXEC),
                                  FILE_CHECK);