From: Pavel Begunkov asml.silence@gmail.com
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 axboe@kernel.dk Signed-off-by: Pavel Begunkov asml.silence@gmail.com Link: https://lore.kernel.org/r/b2756c340aed7d6c0b302c26dab50c6c5907f4ce.162945168... Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/io_uring.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -7669,6 +7669,8 @@ static int io_sqe_files_register(struct 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;