audit: remove duplicate export of audit_enabled

[karo-tx-linux.git] / kernel / capability.c

diff --git a/kernel/capability.c b/kernel/capability.c
index 3f1adb6c647015d80aa6b5b138f118fde7484d11..f6c2ce5701e1c3c723d03e3d917c62f584c3a074 100644 (file)
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -392,6 +392,30 @@ bool ns_capable(struct user_namespace *ns, int cap)
 }
 EXPORT_SYMBOL(ns_capable);
 
+/**
+ * file_ns_capable - Determine if the file's opener had a capability in effect
+ * @file:  The file we want to check
+ * @ns:  The usernamespace we want the capability in
+ * @cap: The capability to be tested for
+ *
+ * Return true if task that opened the file had a capability in effect
+ * when the file was opened.
+ *
+ * This does not set PF_SUPERPRIV because the caller may not
+ * actually be privileged.
+ */
+bool file_ns_capable(const struct file *file, struct user_namespace *ns, int cap)
+{
+       if (WARN_ON_ONCE(!cap_valid(cap)))
+               return false;
+
+       if (security_capable(file->f_cred, ns, cap) == 0)
+               return true;
+
+       return false;
+}
+EXPORT_SYMBOL(file_ns_capable);
+
 /**
  * capable - Determine if the current task has a superior capability in effect
  * @cap: The capability to be tested for
@@ -419,3 +443,24 @@ bool nsown_capable(int cap)
 {
        return ns_capable(current_user_ns(), cap);
 }
+
+/**
+ * inode_capable - Check superior capability over inode
+ * @inode: The inode in question
+ * @cap: The capability in question
+ *
+ * Return true if the current task has the given superior capability
+ * targeted at it's own user namespace and that the given inode is owned
+ * by the current user namespace or a child namespace.
+ *
+ * Currently we check to see if an inode is owned by the current
+ * user namespace by seeing if the inode's owner maps into the
+ * current user namespace.
+ *
+ */
+bool inode_capable(const struct inode *inode, int cap)
+{
+       struct user_namespace *ns = current_user_ns();
+
+       return ns_capable(ns, cap) && kuid_has_mapping(ns, inode->i_uid);
+}