fs: completely ignore unknown open flags

Currently we just stash anything we got into file->f_flags, and the
report it in fcntl(F_GETFD).  This patch just clears out all unknown
flags so that we don't pass them to the fs or report them.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 6 insertions, 0 deletions

diff --git a/fs/open.c b/fs/open.c
index 949cef29c3bb..7bba2b952f1e 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