2 * Copyright (c) 2013 FreeBSD Foundation
5 * This software was developed by Pawel Jakub Dawidek under sponsorship from
6 * the FreeBSD Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
34 * Note that this file is compiled into the kernel and into libc.
38 #include <sys/types.h>
39 #include <sys/capability.h>
40 #include <sys/systm.h>
42 #include <machine/stdarg.h>
44 #include <sys/types.h>
45 #include <sys/capability.h>
55 #define assert(exp) KASSERT((exp), ("%s:%u", __func__, __LINE__))
58 #define CAPARSIZE_MIN (CAP_RIGHTS_VERSION_00 + 2)
59 #define CAPARSIZE_MAX (CAP_RIGHTS_VERSION + 2)
62 right_to_index(uint64_t right)
64 static const int bit2idx[] = {
65 -1, 0, 1, -1, 2, -1, -1, -1, 3, -1, -1, -1, -1, -1, -1, -1,
66 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
70 idx = CAPIDXBIT(right);
71 assert(idx >= 0 && idx < sizeof(bit2idx) / sizeof(bit2idx[0]));
72 return (bit2idx[idx]);
76 cap_rights_vset(cap_rights_t *rights, va_list ap)
81 assert(CAPVER(rights) == CAP_RIGHTS_VERSION_00);
83 n = CAPARSIZE(rights);
84 assert(n >= CAPARSIZE_MIN && n <= CAPARSIZE_MAX);
87 right = (uint64_t)va_arg(ap, unsigned long long);
90 assert(CAPRVER(right) == 0);
91 i = right_to_index(right);
94 assert(CAPIDXBIT(rights->cr_rights[i]) == CAPIDXBIT(right));
95 rights->cr_rights[i] |= right;
96 assert(CAPIDXBIT(rights->cr_rights[i]) == CAPIDXBIT(right));
101 cap_rights_vclear(cap_rights_t *rights, va_list ap)
106 assert(CAPVER(rights) == CAP_RIGHTS_VERSION_00);
108 n = CAPARSIZE(rights);
109 assert(n >= CAPARSIZE_MIN && n <= CAPARSIZE_MAX);
112 right = (uint64_t)va_arg(ap, unsigned long long);
115 assert(CAPRVER(right) == 0);
116 i = right_to_index(right);
119 assert(CAPIDXBIT(rights->cr_rights[i]) == CAPIDXBIT(right));
120 rights->cr_rights[i] &= ~(right & 0x01FFFFFFFFFFFFFFULL);
121 assert(CAPIDXBIT(rights->cr_rights[i]) == CAPIDXBIT(right));
126 cap_rights_is_vset(const cap_rights_t *rights, va_list ap)
131 assert(CAPVER(rights) == CAP_RIGHTS_VERSION_00);
133 n = CAPARSIZE(rights);
134 assert(n >= CAPARSIZE_MIN && n <= CAPARSIZE_MAX);
137 right = (uint64_t)va_arg(ap, unsigned long long);
140 assert(CAPRVER(right) == 0);
141 i = right_to_index(right);
144 assert(CAPIDXBIT(rights->cr_rights[i]) == CAPIDXBIT(right));
145 if ((rights->cr_rights[i] & right) != right)
153 __cap_rights_init(int version, cap_rights_t *rights, ...)
158 assert(version == CAP_RIGHTS_VERSION_00);
161 assert(n >= CAPARSIZE_MIN && n <= CAPARSIZE_MAX);
162 memset(rights->cr_rights, 0, sizeof(rights->cr_rights[0]) * n);
164 va_start(ap, rights);
165 cap_rights_vset(rights, ap);
172 __cap_rights_set(cap_rights_t *rights, ...)
176 assert(CAPVER(rights) == CAP_RIGHTS_VERSION_00);
178 va_start(ap, rights);
179 cap_rights_vset(rights, ap);
186 __cap_rights_clear(cap_rights_t *rights, ...)
190 assert(CAPVER(rights) == CAP_RIGHTS_VERSION_00);
192 va_start(ap, rights);
193 cap_rights_vclear(rights, ap);
200 __cap_rights_is_set(const cap_rights_t *rights, ...)
205 assert(CAPVER(rights) == CAP_RIGHTS_VERSION_00);
207 va_start(ap, rights);
208 ret = cap_rights_is_vset(rights, ap);
215 cap_rights_is_valid(const cap_rights_t *rights)
217 cap_rights_t allrights;
220 if (CAPVER(rights) != CAP_RIGHTS_VERSION_00)
222 if (CAPARSIZE(rights) < CAPARSIZE_MIN ||
223 CAPARSIZE(rights) > CAPARSIZE_MAX) {
227 if (!cap_rights_contains(&allrights, rights))
229 for (i = 0; i < CAPARSIZE(rights); i++) {
230 j = right_to_index(rights->cr_rights[i]);
234 if (CAPRVER(rights->cr_rights[i]) != 0)
243 cap_rights_merge(cap_rights_t *dst, const cap_rights_t *src)
247 assert(CAPVER(dst) == CAP_RIGHTS_VERSION_00);
248 assert(CAPVER(src) == CAP_RIGHTS_VERSION_00);
249 assert(CAPVER(dst) == CAPVER(src));
250 assert(cap_rights_is_valid(src));
251 assert(cap_rights_is_valid(dst));
254 assert(n >= CAPARSIZE_MIN && n <= CAPARSIZE_MAX);
256 for (i = 0; i < n; i++)
257 dst->cr_rights[i] |= src->cr_rights[i];
259 assert(cap_rights_is_valid(src));
260 assert(cap_rights_is_valid(dst));
266 cap_rights_remove(cap_rights_t *dst, const cap_rights_t *src)
270 assert(CAPVER(dst) == CAP_RIGHTS_VERSION_00);
271 assert(CAPVER(src) == CAP_RIGHTS_VERSION_00);
272 assert(CAPVER(dst) == CAPVER(src));
273 assert(cap_rights_is_valid(src));
274 assert(cap_rights_is_valid(dst));
277 assert(n >= CAPARSIZE_MIN && n <= CAPARSIZE_MAX);
279 for (i = 0; i < n; i++) {
281 ~(src->cr_rights[i] & 0x01FFFFFFFFFFFFFFULL);
284 assert(cap_rights_is_valid(src));
285 assert(cap_rights_is_valid(dst));
291 cap_rights_contains(const cap_rights_t *big, const cap_rights_t *little)
295 assert(CAPVER(big) == CAP_RIGHTS_VERSION_00);
296 assert(CAPVER(little) == CAP_RIGHTS_VERSION_00);
297 assert(CAPVER(big) == CAPVER(little));
300 assert(n >= CAPARSIZE_MIN && n <= CAPARSIZE_MAX);
302 for (i = 0; i < n; i++) {
303 if ((big->cr_rights[i] & little->cr_rights[i]) !=
304 little->cr_rights[i]) {