linux-kernel - [PATCH 5.10 002/306] io_uring: limit fixed table size by RLIMIT

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Message-Id: <20210916155753.989906303@linuxfoundation.org>
Date:   Thu, 16 Sep 2021 17:55:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        Pavel Begunkov <asml.silence@...il.com>
Subject: [PATCH 5.10 002/306] io_uring: limit fixed table size by RLIMIT_NOFILE

From: Pavel Begunkov <asml.silence@...il.com>

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@...r.kernel.org
Suggested-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
Link: https://lore.kernel.org/r/b2756c340aed7d6c0b302c26dab50c6c5907f4ce.1629451684.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 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)