1 /* $NetBSD: accessors.c,v 1.3 2016/01/26 23:12:17 pooka Exp $ */
2
3 /*
4 * Copyright (c) 2007-2011 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 /*
29 * This file contains various data structure accessor routines.
30 * They are meant to help clients that make calls into the depths
31 * of the kernel (e.g. at vfs layer) bypassing the syscall layer.
32 */
33
34 #include <sys/cdefs.h>
35 __KERNEL_RCSID(0, "$NetBSD: accessors.c,v 1.3 2016/01/26 23:12:17 pooka Exp $");
36
37 #include <sys/param.h>
38 #include <sys/kauth.h>
39 #include <sys/kmem.h>
40 #include <sys/uio.h>
41
42 #include <rump-sys/kern.h>
43
44 struct uio *
rump_uio_setup(void * buf,size_t bufsize,off_t offset,enum rump_uiorw rw)45 rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw)
46 {
47 struct uio *uio;
48 enum uio_rw uiorw;
49
50 switch (rw) {
51 case RUMPUIO_READ:
52 uiorw = UIO_READ;
53 break;
54 case RUMPUIO_WRITE:
55 uiorw = UIO_WRITE;
56 break;
57 default:
58 panic("%s: invalid rw %d", __func__, rw);
59 }
60
61 uio = kmem_alloc(sizeof(struct uio), KM_SLEEP);
62 uio->uio_iov = kmem_alloc(sizeof(struct iovec), KM_SLEEP);
63
64 uio->uio_iov->iov_base = buf;
65 uio->uio_iov->iov_len = bufsize;
66
67 uio->uio_iovcnt = 1;
68 uio->uio_offset = offset;
69 uio->uio_resid = bufsize;
70 uio->uio_rw = uiorw;
71 uio->uio_vmspace = curproc->p_vmspace;
72
73 return uio;
74 }
75
76 size_t
rump_uio_getresid(struct uio * uio)77 rump_uio_getresid(struct uio *uio)
78 {
79
80 return uio->uio_resid;
81 }
82
83 off_t
rump_uio_getoff(struct uio * uio)84 rump_uio_getoff(struct uio *uio)
85 {
86
87 return uio->uio_offset;
88 }
89
90 size_t
rump_uio_free(struct uio * uio)91 rump_uio_free(struct uio *uio)
92 {
93 size_t resid;
94
95 resid = uio->uio_resid;
96 kmem_free(uio->uio_iov, sizeof(*uio->uio_iov));
97 kmem_free(uio, sizeof(*uio));
98
99 return resid;
100 }
101
102 kauth_cred_t
rump_cred_create(uid_t uid,gid_t gid,size_t ngroups,gid_t * groups)103 rump_cred_create(uid_t uid, gid_t gid, size_t ngroups, gid_t *groups)
104 {
105 kauth_cred_t cred;
106 int rv;
107
108 cred = kauth_cred_alloc();
109 kauth_cred_setuid(cred, uid);
110 kauth_cred_seteuid(cred, uid);
111 kauth_cred_setsvuid(cred, uid);
112 kauth_cred_setgid(cred, gid);
113 kauth_cred_setgid(cred, gid);
114 kauth_cred_setegid(cred, gid);
115 kauth_cred_setsvgid(cred, gid);
116 rv = kauth_cred_setgroups(cred, groups, ngroups, 0, UIO_SYSSPACE);
117 /* oh this is silly. and by "this" I mean kauth_cred_setgroups() */
118 assert(rv == 0);
119
120 return cred;
121 }
122
123 void
rump_cred_put(kauth_cred_t cred)124 rump_cred_put(kauth_cred_t cred)
125 {
126
127 kauth_cred_free(cred);
128 }
129