Limit the number of files in io_uring fixed tables by RLIMIT_NOFILE, that's the first and the simpliest restriction that we should impose.

Cc: stable@vger.kernel.org Suggested-by: Jens Axboe axboe@kernel.dk Signed-off-by: Pavel Begunkov asml.silence@gmail.com --- fs/io_uring.c | 2 ++ 1 file changed, 2 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c index 30edc329d803..e6301d5d03a8 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -7730,6 +7730,8 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, return -EINVAL; if (nr_args > IORING_MAX_FIXED_FILES) return -EMFILE; + if (nr_args > rlimit(RLIMIT_NOFILE)) + return -EMFILE; ret = io_rsrc_node_switch_start(ctx); if (ret) return ret;