1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
|
/*
* file related system call shims and definitions
*
* Copyright (c) 2013 Stacey D. Son
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef BSD_FILE_H
#define BSD_FILE_H
#include "qemu/path.h"
#define LOCK_PATH(p, arg) \
do { \
(p) = lock_user_string(arg); \
if ((p) == NULL) { \
return -TARGET_EFAULT; \
} \
} while (0)
#define UNLOCK_PATH(p, arg) unlock_user(p, arg, 0)
extern struct iovec *lock_iovec(int type, abi_ulong target_addr, int count,
int copy);
extern void unlock_iovec(struct iovec *vec, abi_ulong target_addr, int count,
int copy);
int safe_open(const char *path, int flags, mode_t mode);
int safe_openat(int fd, const char *path, int flags, mode_t mode);
ssize_t safe_read(int fd, void *buf, size_t nbytes);
ssize_t safe_pread(int fd, void *buf, size_t nbytes, off_t offset);
ssize_t safe_readv(int fd, const struct iovec *iov, int iovcnt);
ssize_t safe_preadv(int fd, const struct iovec *iov, int iovcnt, off_t offset);
ssize_t safe_write(int fd, void *buf, size_t nbytes);
ssize_t safe_pwrite(int fd, void *buf, size_t nbytes, off_t offset);
ssize_t safe_writev(int fd, const struct iovec *iov, int iovcnt);
ssize_t safe_pwritev(int fd, const struct iovec *iov, int iovcnt, off_t offset);
/* read(2) */
static abi_long do_bsd_read(abi_long arg1, abi_long arg2, abi_long arg3)
{
abi_long ret;
void *p;
p = lock_user(VERIFY_WRITE, arg2, arg3, 0);
if (p == NULL) {
return -TARGET_EFAULT;
}
ret = get_errno(safe_read(arg1, p, arg3));
unlock_user(p, arg2, ret);
return ret;
}
/* pread(2) */
static abi_long do_bsd_pread(void *cpu_env, abi_long arg1,
abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
{
abi_long ret;
void *p;
p = lock_user(VERIFY_WRITE, arg2, arg3, 0);
if (p == NULL) {
return -TARGET_EFAULT;
}
if (regpairs_aligned(cpu_env) != 0) {
arg4 = arg5;
arg5 = arg6;
}
ret = get_errno(safe_pread(arg1, p, arg3, target_arg64(arg4, arg5)));
unlock_user(p, arg2, ret);
return ret;
}
/* readv(2) */
static abi_long do_bsd_readv(abi_long arg1, abi_long arg2, abi_long arg3)
{
abi_long ret;
struct iovec *vec = lock_iovec(VERIFY_WRITE, arg2, arg3, 0);
if (vec != NULL) {
ret = get_errno(safe_readv(arg1, vec, arg3));
unlock_iovec(vec, arg2, arg3, 1);
} else {
ret = -host_to_target_errno(errno);
}
return ret;
}
/* preadv(2) */
static abi_long do_bsd_preadv(void *cpu_env, abi_long arg1,
abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
{
abi_long ret;
struct iovec *vec = lock_iovec(VERIFY_WRITE, arg2, arg3, 1);
if (vec != NULL) {
if (regpairs_aligned(cpu_env) != 0) {
arg4 = arg5;
arg5 = arg6;
}
ret = get_errno(safe_preadv(arg1, vec, arg3, target_arg64(arg4, arg5)));
unlock_iovec(vec, arg2, arg3, 0);
} else {
ret = -host_to_target_errno(errno);
}
return ret;
}
/* write(2) */
static abi_long do_bsd_write(abi_long arg1, abi_long arg2, abi_long arg3)
{
abi_long nbytes, ret;
void *p;
/* nbytes < 0 implies that it was larger than SIZE_MAX. */
nbytes = arg3;
if (nbytes < 0) {
return -TARGET_EINVAL;
}
p = lock_user(VERIFY_READ, arg2, nbytes, 1);
if (p == NULL) {
return -TARGET_EFAULT;
}
ret = get_errno(safe_write(arg1, p, arg3));
unlock_user(p, arg2, 0);
return ret;
}
/* pwrite(2) */
static abi_long do_bsd_pwrite(void *cpu_env, abi_long arg1,
abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
{
abi_long ret;
void *p;
p = lock_user(VERIFY_READ, arg2, arg3, 1);
if (p == NULL) {
return -TARGET_EFAULT;
}
if (regpairs_aligned(cpu_env) != 0) {
arg4 = arg5;
arg5 = arg6;
}
ret = get_errno(safe_pwrite(arg1, p, arg3, target_arg64(arg4, arg5)));
unlock_user(p, arg2, 0);
return ret;
}
/* writev(2) */
static abi_long do_bsd_writev(abi_long arg1, abi_long arg2, abi_long arg3)
{
abi_long ret;
struct iovec *vec = lock_iovec(VERIFY_READ, arg2, arg3, 1);
if (vec != NULL) {
ret = get_errno(safe_writev(arg1, vec, arg3));
unlock_iovec(vec, arg2, arg3, 0);
} else {
ret = -host_to_target_errno(errno);
}
return ret;
}
/* pwritev(2) */
static abi_long do_bsd_pwritev(void *cpu_env, abi_long arg1,
abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
{
abi_long ret;
struct iovec *vec = lock_iovec(VERIFY_READ, arg2, arg3, 1);
if (vec != NULL) {
if (regpairs_aligned(cpu_env) != 0) {
arg4 = arg5;
arg5 = arg6;
}
ret = get_errno(safe_pwritev(arg1, vec, arg3, target_arg64(arg4, arg5)));
unlock_iovec(vec, arg2, arg3, 0);
} else {
ret = -host_to_target_errno(errno);
}
return ret;
}
/* open(2) */
static abi_long do_bsd_open(abi_long arg1, abi_long arg2, abi_long arg3)
{
abi_long ret;
void *p;
LOCK_PATH(p, arg1);
ret = get_errno(safe_open(path(p), target_to_host_bitmask(arg2,
fcntl_flags_tbl), arg3));
UNLOCK_PATH(p, arg1);
return ret;
}
/* openat(2) */
static abi_long do_bsd_openat(abi_long arg1, abi_long arg2,
abi_long arg3, abi_long arg4)
{
abi_long ret;
void *p;
LOCK_PATH(p, arg2);
ret = get_errno(safe_openat(arg1, path(p),
target_to_host_bitmask(arg3, fcntl_flags_tbl), arg4));
UNLOCK_PATH(p, arg2);
return ret;
}
/* close(2) */
static inline abi_long do_bsd_close(abi_long arg1)
{
return get_errno(close(arg1));
}
/* fdatasync(2) */
static abi_long do_bsd_fdatasync(abi_long arg1)
{
return get_errno(fdatasync(arg1));
}
/* fsync(2) */
static abi_long do_bsd_fsync(abi_long arg1)
{
return get_errno(fsync(arg1));
}
/* closefrom(2) */
static abi_long do_bsd_closefrom(abi_long arg1)
{
closefrom(arg1); /* returns void */
return get_errno(0);
}
/* revoke(2) */
static abi_long do_bsd_revoke(abi_long arg1)
{
abi_long ret;
void *p;
LOCK_PATH(p, arg1);
ret = get_errno(revoke(p)); /* XXX path(p)? */
UNLOCK_PATH(p, arg1);
return ret;
}
/* access(2) */
static abi_long do_bsd_access(abi_long arg1, abi_long arg2)
{
abi_long ret;
void *p;
LOCK_PATH(p, arg1);
ret = get_errno(access(path(p), arg2));
UNLOCK_PATH(p, arg1);
return ret;
}
/* eaccess(2) */
static abi_long do_bsd_eaccess(abi_long arg1, abi_long arg2)
{
abi_long ret;
void *p;
LOCK_PATH(p, arg1);
ret = get_errno(eaccess(path(p), arg2));
UNLOCK_PATH(p, arg1);
return ret;
}
/* faccessat(2) */
static abi_long do_bsd_faccessat(abi_long arg1, abi_long arg2,
abi_long arg3, abi_long arg4)
{
abi_long ret;
void *p;
LOCK_PATH(p, arg2);
ret = get_errno(faccessat(arg1, p, arg3, arg4)); /* XXX path(p)? */
UNLOCK_PATH(p, arg2);
return ret;
}
#endif /* BSD_FILE_H */
|
