fsnotify: new fsnotify hooks and events types for access decisions

introduce a new fsnotify hook, fsnotify_perm(), which is called from the
security code.  This hook is used to allow fsnotify groups to make access
control decisions about events on the system.  We also must change the
generic fsnotify function to return an error code if we intend these hooks
to be in any way useful.

Signed-off-by: Eric Paris <eparis@redhat.com>

1 files changed, 14 insertions, 2 deletions

diff --git a/security/security.c b/security/security.c
index 351942a4ca0..f6ac27cd345 100644
--- a/security/security.c
+++ b/security/security.c
@@ -620,7 +620,13 @@ void security_inode_getsecid(const struct inode *inode, u32 *secid)
 
 int security_file_permission(struct file *file, int mask)
 {
-        return security_ops->file_permission(file, mask);
+        int ret;
+
+        ret = security_ops->file_permission(file, mask);
+        if (ret)
+                return ret;
+
+        return fsnotify_perm(file, mask);
 }
 
 int security_file_alloc(struct file *file)
@@ -684,7 +690,13 @@ int security_file_receive(struct file *file)
 
 int security_dentry_open(struct file *file, const struct cred *cred)
 {
-        return security_ops->dentry_open(file, cred);
+        int ret;
+
+        ret = security_ops->dentry_open(file, cred);
+        if (ret)
+                return ret;
+
+        return fsnotify_perm(file, MAY_OPEN);
 }
 
 int security_task_create(unsigned long clone_flags)