This is a note to let you know that I've just added the patch titled
fs: completely ignore unknown open flags
to the 4.9-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-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 629e014bb8349fcf7c1e4df19a842652ece1c945 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@xxxxxx>
Date: Thu, 27 Apr 2017 09:42:25 +0200
Subject: fs: completely ignore unknown open flags
From: Christoph Hellwig <hch@xxxxxx>
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.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/open.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/fs/open.c
+++ b/fs/open.c
@@ -902,6 +902,12 @@ static inline int build_open_flags(int f
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
Patches currently in stable-queue which might be from hch@xxxxxx are
queue-4.9/fs-add-a-valid_open_flags.patch
queue-4.9/fs-completely-ignore-unknown-open-flags.patch