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| author | Christoph Hellwig <hch@lst.de> | 2017-04-27 09:42:25 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2017-04-27 05:13:04 -0400 |
| commit | 629e014bb8349fcf7c1e4df19a842652ece1c945 (patch) | |
| tree | 10d1c47fe1c0a4455671e46ca57dcec0615ce7a0 | |
| parent | 80f18379a7c350c011d30332658aa15fe49a8fa5 (diff) | |
| download | linux-stable-629e014bb8349fcf7c1e4df19a842652ece1c945.tar.gz linux-stable-629e014bb8349fcf7c1e4df19a842652ece1c945.tar.bz2 linux-stable-629e014bb8349fcf7c1e4df19a842652ece1c945.zip | |
fs: completely ignore unknown open flags
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>
| -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 949cef29c3bb..7bba2b952f1e 100644 --- a/fs/open.c +++ b/fs/open.c @@ -900,6 +900,12 @@ static inline int build_open_flags(int flags, umode_t mode, struct open_flags *o 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 |