Commit 44d28279 authored Jan 16, 2020 by Jens Axboe

io_uring: only allow submit from owning task



If the credentials or the mm doesn't match, don't allow the task to
submit anything on behalf of this ring. The task that owns the ring can
pass the file descriptor to another task, but we don't want to allow
that task to submit an SQE that then assumes the ring mm and creds if
it needs to go async.

Cc: stable@vger.kernel.org
Suggested-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent 11ba820b

fs/io_uring.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -5159,6 +5159,12 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
		} else if (to_submit) {
		struct mm_struct *cur_mm;

		if (current->mm != ctx->sqo_mm \|\|
		current_cred() != ctx->creds) {
		ret = -EPERM;
		goto out;
		}

		to_submit = min(to_submit, ctx->sq_entries);
		mutex_lock(&ctx->uring_lock);
		/* already have mm, so io_submit_sqes() won't try to grab it */

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