1 /*
2 * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
3 */
4 /*
5 * Copyright (c) 1997 by Apple Computer, Inc., all rights reserved
6 * Copyright (c) 1993 NeXT Computer, Inc.
7 *
8 */
9
10 #include <sys/cdefs.h>
11 #include <sys/param.h>
12 #include <sys/systm.h>
13 #include <sys/ioctl.h>
14 #include <sys/tty.h>
15 #include <sys/conf.h>
16 #include <sys/kauth.h>
17 #include <sys/ucred.h>
18 #include <sys/proc_internal.h>
19 #include <sys/sysproto.h>
20 #include <sys/user.h>
21 #include <kern/task.h>
22 #include <kern/thread.h>
23 #include <vm/vm_map.h>
24
25
26 /*
27 * copy a null terminated string from the kernel address space into the user
28 * address space. - if the user is denied write access, return EFAULT. - if
29 * the end of string isn't found before maxlen bytes are copied, return
30 * ENAMETOOLONG, indicating an incomplete copy. - otherwise, return 0,
31 * indicating success. the number of bytes copied is always returned in
32 * lencopied.
33 */
34 int
copyoutstr(const void * from,user_addr_t to,size_t maxlen,size_t * lencopied)35 copyoutstr(const void *from, user_addr_t to, size_t maxlen, size_t * lencopied)
36 {
37 size_t slen;
38 size_t len;
39 int error = copyoutstr_prevalidate(from, to, maxlen);
40
41 if (__improbable(error)) {
42 return error;
43 }
44
45 slen = strlen(from) + 1;
46 if (slen > maxlen) {
47 error = ENAMETOOLONG;
48 }
49
50 len = MIN(maxlen, slen);
51 if (copyout(from, to, len)) {
52 error = EFAULT;
53 }
54 *lencopied = len;
55
56 return error;
57 }
58
59
60 /*
61 * copy a null terminated string from one point to another in the kernel
62 * address space. - no access checks are performed. - if the end of string
63 * isn't found before maxlen bytes are copied, return ENAMETOOLONG,
64 * indicating an incomplete copy. - otherwise, return 0, indicating success.
65 * the number of bytes copied is always returned in lencopied.
66 */
67 /* from ppc/fault_copy.c -Titan1T4 VERSION */
68 int
copystr(const void * vfrom,void * vto,size_t maxlen,size_t * lencopied)69 copystr(const void *vfrom, void *vto, size_t maxlen, size_t * lencopied)
70 {
71 size_t l;
72 char const *from = (char const *) vfrom;
73 char *to = (char *) vto;
74
75 for (l = 0; l < maxlen; l++) {
76 if ((*to++ = *from++) == '\0') {
77 if (lencopied) {
78 *lencopied = l + 1;
79 }
80 return 0;
81 }
82 }
83 if (lencopied) {
84 *lencopied = maxlen;
85 }
86 return ENAMETOOLONG;
87 }
88
89 int
copywithin(void * src,void * dst,size_t count)90 copywithin(void *src, void *dst, size_t count)
91 {
92 bcopy(src, dst, count);
93 return 0;
94 }
95
96