1 files changed, 6 insertions, 0 deletions

diff --git a/fs/open.c b/fs/open.c
index 4d23f729dcc6..373787afd638 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -900,6 +900,12 @@ static inline int build_open_flags(int flags, umode_t mode, struct open_flags *o
         int lookup_flags = 0;
         int acc_mode = ACC_MODE(flags);
 
+        /*
+         * Clear out all open flags we don't know about so that we don't report
+         * them in fcntl(F_GETFD) or similar interfaces.
+         */
+        flags &= VALID_OPEN_FLAGS;
+
         if (flags & (O_CREAT | __O_TMPFILE))
                 op->mode = (mode & S_IALLUGO) | S_IFREG;
         else