From: Pavel Begunkov <asml.silence@xxxxxxxxx> 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@xxxxxxxxxxxxxxx Suggested-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx> Link: https://lore.kernel.org/r/b2756c340aed7d6c0b302c26dab50c6c5907f4ce.1629451684.git.asml.silence@xxxxxxxxx Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/io_uring.c | 2 ++ 1 file changed, 2 insertions(+) --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -7579,6 +7579,8 @@ 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; file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL); if (!file_data)
