[PATCH 2/2] fs: reject unknown open flags
From: Christoph Hellwig <hch@lst.de>
Date: 2017-03-30 16:33:45
Also in:
linux-fsdevel, lkml
Subsystem:
filesystems (vfs and infrastructure), the rest · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds
This way userspace can probe for actually supported flags. Signed-off-by: Christoph Hellwig <hch@lst.de> --- fs/open.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/fs/open.c b/fs/open.c
index 949cef29c3bb..9106ed7310f0 100644
--- a/fs/open.c
+++ b/fs/open.c@@ -900,6 +900,9 @@ 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); + if (flags & ~VALID_OPEN_FLAGS) + return -EINVAL; + if (flags & (O_CREAT | __O_TMPFILE)) op->mode = (mode & S_IALLUGO) | S_IFREG; else
--
2.11.0