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io_uring: limit fixed table size by RLIMIT_NOFILE

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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>
This commit is contained in:
Pavel Begunkov 2021-08-20 10:36:35 +01:00 committed by Jens Axboe
parent 99c8bc52d1
commit 3a1b8a4e84
1 changed files with 2 additions and 0 deletions
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2
fs/io_uring.c
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@ -7733,6 +7733,8 @@ 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;