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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. Arguably, we could still permit known lookup-related flags such as AT_SYMLINK_NOFOLLOW. However, that would be inconsistent with how sys_utimensat() behaves when passed a NULL path, which seems to be the closest precedent. And given that the NULL path case is (I believe) mainly intended to be used to implement a wrapper function like fstatx() that doesn't have a path argument, I think rejecting lookup-related flags too is probably the best choice. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.