6.5-stable review patch. If anyone has any objections, please let me know.
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From: Jens Axboe axboe@kernel.dk
commit a52d4f657568d6458e873f74a9602e022afe666f upstream.
This is unionized with the actual link flags, so they can of course be set and they will be evaluated further down. If not we fail any LINKAT that has to set option flags.
Fixes: cf30da90bc3a ("io_uring: add support for IORING_OP_LINKAT") Cc: stable@vger.kernel.org Reported-by: Thomas Leonard talex5@gmail.com Link: https://github.com/axboe/liburing/issues/955 Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- io_uring/fs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/io_uring/fs.c +++ b/io_uring/fs.c @@ -243,7 +243,7 @@ int io_linkat_prep(struct io_kiocb *req, struct io_link *lnk = io_kiocb_to_cmd(req, struct io_link); const char __user *oldf, *newf;
- if (sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) + if (sqe->buf_index || sqe->splice_fd_in) return -EINVAL; if (unlikely(req->flags & REQ_F_FIXED_FILE)) return -EBADF;