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From: Pavel Begunkov <asml.silence@gmail.com>
To: Jens Axboe <axboe@kernel.dk>, io-uring@vger.kernel.org
Cc: stable@vger.kernel.org
Subject: [PATCH 1/3] io_uring: limit fixed table size by RLIMIT_NOFILE
Date: Fri, 20 Aug 2021 10:36:35 +0100	[thread overview]
Message-ID: <b2756c340aed7d6c0b302c26dab50c6c5907f4ce.1629451684.git.asml.silence@gmail.com> (raw)
In-Reply-To: <cover.1629451684.git.asml.silence@gmail.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@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;
-- 
2.32.0


  reply	other threads:[~2021-08-20  9:37 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-20  9:36 [PATCH 0/3] changes around fixed rsrc Pavel Begunkov
2021-08-20  9:36 ` Pavel Begunkov [this message]
2021-08-20  9:36 ` [PATCH 2/3] io_uring: place fixed tables under memcg limits Pavel Begunkov
2021-08-20  9:36 ` [PATCH 3/3] io_uring: add ->splice_fd_in checks Pavel Begunkov
2021-08-21 13:18 ` [PATCH 0/3] changes around fixed rsrc Jens Axboe
2021-08-21 14:25   ` Pavel Begunkov

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