1 /*-
2 * Copyright (c) 2015 Nuxi, https://nuxi.nl/
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
28
29 #include <sys/param.h>
30 #include <sys/kernel.h>
31 #include <sys/limits.h>
32 #include <sys/malloc.h>
33 #include <sys/syscallsubr.h>
34 #include <sys/systm.h>
35 #include <sys/uio.h>
36
37 #include <compat/cloudabi64/cloudabi64_syscalldefs.h>
38 #include <compat/cloudabi64/cloudabi64_proto.h>
39
40 /* Copies in 64-bit iovec structures from userspace. */
41 static int
cloudabi64_copyinuio(const cloudabi64_iovec_t * iovp,size_t iovcnt,struct uio ** uiop)42 cloudabi64_copyinuio(const cloudabi64_iovec_t *iovp, size_t iovcnt,
43 struct uio **uiop)
44 {
45 cloudabi64_iovec_t iovobj;
46 struct uio *uio;
47 struct iovec *iov;
48 size_t i;
49 int error;
50
51 /* Allocate uio and iovecs. */
52 if (iovcnt > UIO_MAXIOV)
53 return (EINVAL);
54 uio = malloc(sizeof(struct uio) + iovcnt * sizeof(struct iovec),
55 M_IOV, M_WAITOK);
56 iov = (struct iovec *)(uio + 1);
57
58 /* Initialize uio. */
59 uio->uio_iov = iov;
60 uio->uio_iovcnt = iovcnt;
61 uio->uio_segflg = UIO_USERSPACE;
62 uio->uio_offset = -1;
63 uio->uio_resid = 0;
64
65 /* Copy in iovecs. */
66 for (i = 0; i < iovcnt; i++) {
67 error = copyin(&iovp[i], &iovobj, sizeof(iovobj));
68 if (error != 0) {
69 free(uio, M_IOV);
70 return (error);
71 }
72 iov[i].iov_base = (void *)iovobj.iov_base;
73 iov[i].iov_len = iovobj.iov_len;
74 if (iov[i].iov_len > SSIZE_MAX - uio->uio_resid) {
75 free(uio, M_IOV);
76 return (EINVAL);
77 }
78 uio->uio_resid += iov[i].iov_len;
79 }
80
81 *uiop = uio;
82 return (0);
83 }
84
85 int
cloudabi64_sys_fd_pread(struct thread * td,struct cloudabi64_sys_fd_pread_args * uap)86 cloudabi64_sys_fd_pread(struct thread *td,
87 struct cloudabi64_sys_fd_pread_args *uap)
88 {
89 struct uio *uio;
90 int error;
91
92 error = cloudabi64_copyinuio(uap->iov, uap->iovcnt, &uio);
93 if (error != 0)
94 return (error);
95 error = kern_preadv(td, uap->fd, uio, uap->offset);
96 free(uio, M_IOV);
97 return (error);
98 }
99
100 int
cloudabi64_sys_fd_pwrite(struct thread * td,struct cloudabi64_sys_fd_pwrite_args * uap)101 cloudabi64_sys_fd_pwrite(struct thread *td,
102 struct cloudabi64_sys_fd_pwrite_args *uap)
103 {
104 struct uio *uio;
105 int error;
106
107 error = cloudabi64_copyinuio((const cloudabi64_iovec_t *)uap->iov,
108 uap->iovcnt, &uio);
109 if (error != 0)
110 return (error);
111 error = kern_pwritev(td, uap->fd, uio, uap->offset);
112 free(uio, M_IOV);
113 return (error);
114 }
115
116 int
cloudabi64_sys_fd_read(struct thread * td,struct cloudabi64_sys_fd_read_args * uap)117 cloudabi64_sys_fd_read(struct thread *td,
118 struct cloudabi64_sys_fd_read_args *uap)
119 {
120 struct uio *uio;
121 int error;
122
123 error = cloudabi64_copyinuio(uap->iov, uap->iovcnt, &uio);
124 if (error != 0)
125 return (error);
126 error = kern_readv(td, uap->fd, uio);
127 free(uio, M_IOV);
128 return (error);
129 }
130
131 int
cloudabi64_sys_fd_write(struct thread * td,struct cloudabi64_sys_fd_write_args * uap)132 cloudabi64_sys_fd_write(struct thread *td,
133 struct cloudabi64_sys_fd_write_args *uap)
134 {
135 struct uio *uio;
136 int error;
137
138 error = cloudabi64_copyinuio((const cloudabi64_iovec_t *)uap->iov,
139 uap->iovcnt, &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