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authorChristoph Hellwig <hch@lst.de>2017-04-27 09:42:25 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2017-04-27 05:13:04 -0400
commit629e014bb8349fcf7c1e4df19a842652ece1c945 (patch)
tree10d1c47fe1c0a4455671e46ca57dcec0615ce7a0 /fs/open.c
parent80f18379a7c350c011d30332658aa15fe49a8fa5 (diff)
downloadlinux-629e014bb8349fcf7c1e4df19a842652ece1c945.tar.bz2
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>
Diffstat (limited to 'fs/open.c')
-rw-r--r--fs/open.c6
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