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| author | Christoph Hellwig <hch@lst.de> | 2017-04-27 09:42:25 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-15 11:57:44 +0200 |
| commit | 4043d5bca587eab2dfcca5e2da7e770d16b127c8 (patch) | |
| tree | 0b800d49ae5502d5ff06f3181e57a987a5b48379 | |
| parent | ccb973e681d8f9fedb398b87a115b48ed96a6214 (diff) | |
| download | linux-stable-4043d5bca587eab2dfcca5e2da7e770d16b127c8.tar.gz linux-stable-4043d5bca587eab2dfcca5e2da7e770d16b127c8.tar.bz2 linux-stable-4043d5bca587eab2dfcca5e2da7e770d16b127c8.zip | |
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 <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/open.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/open.c b/fs/open.c index 157b9940dd73..fbc5c7b230b3 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 |