Patch "fs: completely ignore unknown open flags" has been added to the 3.18-stable tree

This is a note to let you know that I've just added the patch titled

fs: completely ignore unknown open flags

to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
fs-completely-ignore-unknown-open-flags.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Christoph Hellwig <[email protected]>
Date: Thu, 27 Apr 2017 09:42:25 +0200
Subject: fs: completely ignore unknown open flags

From: Christoph Hellwig <[email protected]>

commit 629e014bb8349fcf7c1e4df19a842652ece1c945 upstream.

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.

---
 fs/open.c |    6 ++++++
 1 file changed, 6 insertions(+)

@@ -868,6 +868,12 @@ static inline int build_open_flags(int f
 	int lookup_flags = 0;
 	int acc_mode;
 
+	/*
+	 * 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

Patches currently in stable-queue which might be from [email protected] are

queue-3.18/fs-add-a-valid_open_flags.patch queue-3.18/fs-completely-ignore-unknown-open-flags.patch