On Fri, Mar 10, 2017 at 10:58:23PM -0800, Eric Biggers wrote:

From: Eric Biggers <redacted>

The statx() system call currently accepts unknown flags when called with
a NULL path to operate on a file descriptor.  Left unchanged, this could
make it hard to introduce new query flags in the future, since
applications may not be able to tell whether a given flag is supported.

Fix this by failing the system call with EINVAL if any flags other than
KSTAT_QUERY_FLAGS are specified in combination with a NULL path.

Does anyone have comments on this patch?

I really think we need to get this in before v4.11 is released, since it deals
with the API.

- Eric