| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 02/57] fs: completely ignore unknown open flags | Date | Thu, 13 Jul 2017 17:42:17 +0200 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Christoph Hellwig <hch@lst.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@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- fs/open.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/fs/open.c +++ b/fs/open.c @@ -885,6 +885,12 @@ 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
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