4f8313adcd
The random_get() system call works similar to getentropy()/getrandom() on OpenBSD/Linux. It fills a buffer with random data. This change introduces a new function, read_random_uio(), that is used to implement read() on the random devices. We can call into this function from within the CloudABI compatibility layer. Approved by: secteam Reviewed by: jmg, markm, wblock Obtained from: https://github.com/NuxiNL/freebsd Differential Revision: https://reviews.freebsd.org/D3053
54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
/*-
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* Copyright (c) 2015 Nuxi, https://nuxi.nl/
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/random.h>
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#include <sys/uio.h>
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#include <compat/cloudabi/cloudabi_proto.h>
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int
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cloudabi_sys_random_get(struct thread *td,
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struct cloudabi_sys_random_get_args *uap)
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{
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struct iovec iov = {
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.iov_base = uap->buf,
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.iov_len = uap->nbyte
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};
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struct uio uio = {
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.uio_iov = &iov,
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.uio_iovcnt = 1,
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.uio_resid = iov.iov_len,
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.uio_segflg = UIO_USERSPACE,
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.uio_rw = UIO_READ,
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.uio_td = td
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};
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return (read_random_uio(&uio, false));
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}
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