From 917342c3714358991d8ac2bd29bff8f6ea62f077 Mon Sep 17 00:00:00 2001 From: Pavel Begunkov Date: Fri, 20 Aug 2021 10:36:35 +0100 Subject: [PATCH] io_uring: limit fixed table size by RLIMIT_NOFILE commit 3a1b8a4e843f96b636431450d8d79061605cf74b upstream. 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 Signed-off-by: Pavel Begunkov Link: https://lore.kernel.org/r/b2756c340aed7d6c0b302c26dab50c6c5907f4ce.1629451684.git.asml.silence@gmail.com Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- fs/io_uring.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/io_uring.c b/fs/io_uring.c index a2e20a6fbfed..0d6f1b335fb3 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -7722,6 +7722,8 @@ 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;