[RFC PATCH 7/9] lsm,io_uring: add LSM hooks to io_uring

[Stefan Metzmacher]

Hi Paul,

>  #define CREATE_TRACE_POINTS
>  #include <trace/events/io_uring.h>
> @@ -6537,6 +6538,11 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
>  		if (!req->work.creds)
>  			return -EINVAL;
>  		get_cred(req->work.creds);
> +		ret = security_uring_override_creds(req->work.creds);
> +		if (ret) {
> +			put_cred(req->work.creds);
> +			return ret;
> +		}

Why are you calling this per requests, shouldn't this be done in
io_register_personality()?

I'm also not sure if this really gains anything as io_register_personality()
only captures the value of get_current_cred(), so the process already has changed to
the credentials (at least once for the io_uring_register(IORING_REGISTER_PERSONALITY)
call).

metze