1 /* $NetBSD: rumpcopy.c,v 1.22 2016/05/25 17:43:58 christos Exp $ */
2
3 /*
4 * Copyright (c) 2009 Antti Kantee. All Rights Reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __KERNEL_RCSID(0, "$NetBSD: rumpcopy.c,v 1.22 2016/05/25 17:43:58 christos Exp $");
30
31 #include <sys/param.h>
32 #include <sys/lwp.h>
33 #include <sys/systm.h>
34 #include <sys/uio.h>
35
36 #include <rump-sys/kern.h>
37
38 #include <rump/rumpuser.h>
39
40 int
copyin(const void * uaddr,void * kaddr,size_t len)41 copyin(const void *uaddr, void *kaddr, size_t len)
42 {
43 int error = 0;
44
45 if (__predict_false(uaddr == NULL && len)) {
46 return EFAULT;
47 }
48
49 if (RUMP_LOCALPROC_P(curproc)) {
50 memcpy(kaddr, uaddr, len);
51 } else if (len) {
52 error = rump_sysproxy_copyin(RUMP_SPVM2CTL(curproc->p_vmspace),
53 uaddr, kaddr, len);
54 }
55
56 return error;
57 }
58
59 int
copyout(const void * kaddr,void * uaddr,size_t len)60 copyout(const void *kaddr, void *uaddr, size_t len)
61 {
62 int error = 0;
63
64 if (__predict_false(uaddr == NULL && len)) {
65 return EFAULT;
66 }
67
68 if (RUMP_LOCALPROC_P(curproc)) {
69 memcpy(uaddr, kaddr, len);
70 } else if (len) {
71 error = rump_sysproxy_copyout(RUMP_SPVM2CTL(curproc->p_vmspace),
72 kaddr, uaddr, len);
73 }
74 return error;
75 }
76
77 int
subyte(void * uaddr,int byte)78 subyte(void *uaddr, int byte)
79 {
80 int error = 0;
81
82 if (RUMP_LOCALPROC_P(curproc))
83 *(char *)uaddr = byte;
84 else
85 error = rump_sysproxy_copyout(RUMP_SPVM2CTL(curproc->p_vmspace),
86 &byte, uaddr, 1);
87
88 return error;
89 }
90
91 int
copystr(const void * kfaddr,void * kdaddr,size_t len,size_t * done)92 copystr(const void *kfaddr, void *kdaddr, size_t len, size_t *done)
93 {
94 uint8_t *to = kdaddr;
95 const uint8_t *from = kfaddr;
96 size_t actlen = 0;
97
98 while (len-- > 0 && (*to++ = *from++) != 0)
99 actlen++;
100
101 if (len+1 == 0 && *(to-1) != 0)
102 return ENAMETOOLONG;
103
104 if (done)
105 *done = actlen+1; /* + '\0' */
106 return 0;
107 }
108
109 int
copyinstr(const void * uaddr,void * kaddr,size_t len,size_t * done)110 copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done)
111 {
112 uint8_t *to;
113 int rv;
114
115 if (len == 0)
116 return 0;
117
118 if (__predict_false(uaddr == NULL)) {
119 return EFAULT;
120 }
121
122 if (RUMP_LOCALPROC_P(curproc))
123 return copystr(uaddr, kaddr, len, done);
124
125 if ((rv = rump_sysproxy_copyinstr(RUMP_SPVM2CTL(curproc->p_vmspace),
126 uaddr, kaddr, &len)) != 0)
127 return rv;
128
129 /* figure out if we got a terminated string or not */
130 to = (uint8_t *)kaddr + (len-1);
131 while (to >= (uint8_t *)kaddr) {
132 if (*to == 0)
133 goto found;
134 to--;
135 }
136 return ENAMETOOLONG;
137
138 found:
139 if (done)
140 *done = strlen(kaddr)+1; /* includes termination */
141
142 return 0;
143 }
144
145 int
copyoutstr(const void * kaddr,void * uaddr,size_t len,size_t * done)146 copyoutstr(const void *kaddr, void *uaddr, size_t len, size_t *done)
147 {
148 size_t slen;
149 int error;
150
151 if (__predict_false(uaddr == NULL && len)) {
152 return EFAULT;
153 }
154
155 if (RUMP_LOCALPROC_P(curproc))
156 return copystr(kaddr, uaddr, len, done);
157
158 slen = strlen(kaddr)+1;
159 if (slen > len)
160 return ENAMETOOLONG;
161
162 error = rump_sysproxy_copyoutstr(RUMP_SPVM2CTL(curproc->p_vmspace),
163 kaddr, uaddr, &slen);
164 if (done)
165 *done = slen;
166
167 return error;
168 }
169
170 int
kcopy(const void * src,void * dst,size_t len)171 kcopy(const void *src, void *dst, size_t len)
172 {
173
174 memcpy(dst, src, len);
175 return 0;
176 }
177
178 /*
179 * Low-level I/O routine. This is used only when "all else fails",
180 * i.e. the current thread does not have an appropriate vm context.
181 */
182 int
uvm_io(struct vm_map * vm,struct uio * uio,int flag)183 uvm_io(struct vm_map *vm, struct uio *uio, int flag)
184 {
185 int error = 0;
186
187 /* loop over iovecs one-by-one and copyout */
188 for (; uio->uio_resid && uio->uio_iovcnt;
189 uio->uio_iovcnt--, uio->uio_iov++) {
190 struct iovec *iov = uio->uio_iov;
191 size_t curlen = MIN(uio->uio_resid, iov->iov_len);
192
193 if (__predict_false(curlen == 0))
194 continue;
195
196 if (uio->uio_rw == UIO_READ) {
197 error = rump_sysproxy_copyin(RUMP_SPVM2CTL(vm),
198 (void *)(vaddr_t)uio->uio_offset, iov->iov_base,
199 curlen);
200 } else {
201 error = rump_sysproxy_copyout(RUMP_SPVM2CTL(vm),
202 iov->iov_base, (void *)(vaddr_t)uio->uio_offset,
203 curlen);
204 }
205 if (error)
206 break;
207
208 iov->iov_base = (uint8_t *)iov->iov_base + curlen;
209 iov->iov_len -= curlen;
210
211 uio->uio_resid -= curlen;
212 uio->uio_offset += curlen;
213 }
214
215 return error;
216 }
217
218 /*
219 * Copy one byte from userspace to kernel.
220 */
221 int
fubyte(const void * base)222 fubyte(const void *base)
223 {
224 unsigned char val;
225 int error;
226
227 error = copyin(base, &val, sizeof(char));
228 if (error != 0)
229 return -1;
230
231 return (int)val;
232 }
233