From: Christoph Hellwig Date: Thu, 27 Apr 2017 07:42:25 +0000 (+0200) Subject: fs: completely ignore unknown open flags X-Git-Tag: v4.4.77~55 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4043d5bca587eab2dfcca5e2da7e770d16b127c8;p=thirdparty%2Fkernel%2Fstable.git fs: completely ignore unknown open flags 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 Signed-off-by: Al Viro Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/open.c b/fs/open.c index 157b9940dd733..fbc5c7b230b3b 100644 --- a/fs/open.c +++ b/fs/open.c @@ -885,6 +885,12 @@ static inline int build_open_flags(int flags, umode_t mode, struct open_flags *o 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