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Date: Mon, 10 Jul 2017 19:10:35 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Christoph Hellwig <hch@....de>, Al Viro <viro@...iv.linux.org.uk> Subject: [PATCH 4.9 02/41] fs: completely ignore unknown open flags 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Christoph Hellwig <hch@....de> 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@....de> Signed-off-by: Al Viro <viro@...iv.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- 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
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