cloudabi32_fd.c revision 316574
1178825Sdfr/*- 2233294Sstas * Copyright (c) 2015 Nuxi, https://nuxi.nl/ 3233294Sstas * 4233294Sstas * Redistribution and use in source and binary forms, with or without 5178825Sdfr * modification, are permitted provided that the following conditions 6233294Sstas * are met: 7233294Sstas * 1. Redistributions of source code must retain the above copyright 8233294Sstas * notice, this list of conditions and the following disclaimer. 9178825Sdfr * 2. Redistributions in binary form must reproduce the above copyright 10233294Sstas * notice, this list of conditions and the following disclaimer in the 11233294Sstas * documentation and/or other materials provided with the distribution. 12178825Sdfr * 13233294Sstas * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14233294Sstas * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15233294Sstas * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16178825Sdfr * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17233294Sstas * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18233294Sstas * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19233294Sstas * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20178825Sdfr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21233294Sstas * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22233294Sstas * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23233294Sstas * SUCH DAMAGE. 24233294Sstas */ 25233294Sstas 26233294Sstas#include <sys/cdefs.h> 27233294Sstas__FBSDID("$FreeBSD: stable/11/sys/compat/cloudabi32/cloudabi32_fd.c 316574 2017-04-06 15:10:36Z ed $"); 28233294Sstas 29233294Sstas#include <sys/param.h> 30233294Sstas#include <sys/kernel.h> 31233294Sstas#include <sys/limits.h> 32178825Sdfr#include <sys/malloc.h> 33178825Sdfr#include <sys/syscallsubr.h> 34233294Sstas#include <sys/systm.h> 35178825Sdfr#include <sys/uio.h> 36233294Sstas 37178825Sdfr#include <contrib/cloudabi/cloudabi32_types.h> 38178825Sdfr 39178825Sdfr#include <compat/cloudabi32/cloudabi32_proto.h> 40178825Sdfr#include <compat/cloudabi32/cloudabi32_util.h> 41178825Sdfr 42178825Sdfr/* Copies in 32-bit iovec structures from userspace. */ 43178825Sdfrstatic int 44178825Sdfrcloudabi32_copyinuio(const cloudabi32_iovec_t *iovp, size_t iovcnt, 45178825Sdfr struct uio **uiop) 46178825Sdfr{ 47178825Sdfr cloudabi32_iovec_t iovobj; 48178825Sdfr struct uio *uio; 49178825Sdfr struct iovec *iov; 50178825Sdfr size_t i; 51233294Sstas int error; 52178825Sdfr 53178825Sdfr /* Allocate uio and iovecs. */ 54178825Sdfr if (iovcnt > UIO_MAXIOV) 55233294Sstas return (EINVAL); 56233294Sstas uio = malloc(sizeof(struct uio) + iovcnt * sizeof(struct iovec), 57178825Sdfr M_IOV, M_WAITOK); 58178825Sdfr iov = (struct iovec *)(uio + 1); 59178825Sdfr 60178825Sdfr /* Initialize uio. */ 61178825Sdfr uio->uio_iov = iov; 62178825Sdfr uio->uio_iovcnt = iovcnt; 63178825Sdfr uio->uio_segflg = UIO_USERSPACE; 64178825Sdfr uio->uio_offset = -1; 65178825Sdfr uio->uio_resid = 0; 66178825Sdfr 67 /* Copy in iovecs. */ 68 for (i = 0; i < iovcnt; i++) { 69 error = copyin(&iovp[i], &iovobj, sizeof(iovobj)); 70 if (error != 0) { 71 free(uio, M_IOV); 72 return (error); 73 } 74 iov[i].iov_base = TO_PTR(iovobj.buf); 75 iov[i].iov_len = iovobj.buf_len; 76 if (iov[i].iov_len > INT32_MAX - uio->uio_resid) { 77 free(uio, M_IOV); 78 return (EINVAL); 79 } 80 uio->uio_resid += iov[i].iov_len; 81 } 82 83 *uiop = uio; 84 return (0); 85} 86 87int 88cloudabi32_sys_fd_pread(struct thread *td, 89 struct cloudabi32_sys_fd_pread_args *uap) 90{ 91 struct uio *uio; 92 int error; 93 94 error = cloudabi32_copyinuio(uap->iovs, uap->iovs_len, &uio); 95 if (error != 0) 96 return (error); 97 error = kern_preadv(td, uap->fd, uio, uap->offset); 98 free(uio, M_IOV); 99 return (error); 100} 101 102int 103cloudabi32_sys_fd_pwrite(struct thread *td, 104 struct cloudabi32_sys_fd_pwrite_args *uap) 105{ 106 struct uio *uio; 107 int error; 108 109 error = cloudabi32_copyinuio(TO_PTR(uap->iovs), uap->iovs_len, &uio); 110 if (error != 0) 111 return (error); 112 error = kern_pwritev(td, uap->fd, uio, uap->offset); 113 free(uio, M_IOV); 114 return (error); 115} 116 117int 118cloudabi32_sys_fd_read(struct thread *td, 119 struct cloudabi32_sys_fd_read_args *uap) 120{ 121 struct uio *uio; 122 int error; 123 124 error = cloudabi32_copyinuio(uap->iovs, uap->iovs_len, &uio); 125 if (error != 0) 126 return (error); 127 error = kern_readv(td, uap->fd, uio); 128 free(uio, M_IOV); 129 return (error); 130} 131 132int 133cloudabi32_sys_fd_write(struct thread *td, 134 struct cloudabi32_sys_fd_write_args *uap) 135{ 136 struct uio *uio; 137 int error; 138 139 error = cloudabi32_copyinuio(TO_PTR(uap->iovs), uap->iovs_len, &uio); 140 if (error != 0) 141 return (error); 142 error = kern_writev(td, uap->fd, uio); 143 free(uio, M_IOV); 144 return (error); 145} 146