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io_uring/msg_ring: fix remote queue to disabled ring
IORING_SETUP_R_DISABLED rings don't have the submitter task set, so
it's not always safe to use ->submitter_task. Disallow posting msg_ring
messaged to disabled rings. Also add task NULL check for loosy sync
around testing for IORING_SETUP_R_DISABLED.
Cc: stable@vger.kernel.org
Fixes: 6d043ee116
("io_uring: do msg_ring in target task via tw")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
parent
56d8e3180c
commit
8579538c89
@ -3674,7 +3674,7 @@ static __cold int io_uring_create(unsigned entries, struct io_uring_params *p,
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if (ctx->flags & IORING_SETUP_SINGLE_ISSUER
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&& !(ctx->flags & IORING_SETUP_R_DISABLED))
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ctx->submitter_task = get_task_struct(current);
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WRITE_ONCE(ctx->submitter_task, get_task_struct(current));
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file = io_uring_get_file(ctx);
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if (IS_ERR(file)) {
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@ -3868,7 +3868,7 @@ static int io_register_enable_rings(struct io_ring_ctx *ctx)
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return -EBADFD;
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if (ctx->flags & IORING_SETUP_SINGLE_ISSUER && !ctx->submitter_task)
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ctx->submitter_task = get_task_struct(current);
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WRITE_ONCE(ctx->submitter_task, get_task_struct(current));
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if (ctx->restrictions.registered)
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ctx->restricted = 1;
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@ -69,6 +69,10 @@ static int io_msg_exec_remote(struct io_kiocb *req, task_work_func_t func)
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{
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struct io_ring_ctx *ctx = req->file->private_data;
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struct io_msg *msg = io_kiocb_to_cmd(req, struct io_msg);
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struct task_struct *task = READ_ONCE(ctx->submitter_task);
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if (unlikely(!task))
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return -EOWNERDEAD;
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init_task_work(&msg->tw, func);
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if (task_work_add(ctx->submitter_task, &msg->tw, TWA_SIGNAL))
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@ -114,6 +118,8 @@ static int io_msg_ring_data(struct io_kiocb *req, unsigned int issue_flags)
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if (msg->src_fd || msg->dst_fd || msg->flags)
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return -EINVAL;
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if (target_ctx->flags & IORING_SETUP_R_DISABLED)
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return -EBADFD;
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if (io_msg_need_remote(target_ctx))
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return io_msg_exec_remote(req, io_msg_tw_complete);
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@ -206,6 +212,8 @@ static int io_msg_send_fd(struct io_kiocb *req, unsigned int issue_flags)
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if (target_ctx == ctx)
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return -EINVAL;
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if (target_ctx->flags & IORING_SETUP_R_DISABLED)
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return -EBADFD;
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if (!src_file) {
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src_file = io_msg_grab_file(req, issue_flags);
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if (!src_file)
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