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io_uring: limit fixed table size by RLIMIT_NOFILE
commit 3a1b8a4e84
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.1629451684.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -7722,6 +7722,8 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
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return -EINVAL;
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if (nr_args > IORING_MAX_FIXED_FILES)
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return -EMFILE;
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if (nr_args > rlimit(RLIMIT_NOFILE))
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return -EMFILE;
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ret = io_rsrc_node_switch_start(ctx);
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if (ret)
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return ret;
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