2 * Copyright (c) 2013 Larisa Grigore <larisagrigore@gmail.com>.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Herb Peyerl.
16 * 4. The name of Herb Peyerl may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 is_root(struct cmsgcred
*cred
) {
38 return (cred
->cmcred_euid
== 0);
42 is_grpmember(gid_t gid
, struct cmsgcred
*cred
) {
45 if (cred
->cmcred_gid
== gid
)
48 for (n
= 0 ; n
< cred
->cmcred_ngroups
; n
++) {
49 if (cred
->cmcred_groups
[n
] == gid
)
57 ipcperm(struct cmsgcred
*cred
, struct ipc_perm
*perm
, int mode
) {
61 if (cred
->cmcred_euid
!= perm
->cuid
62 && cred
->cmcred_euid
!= perm
->uid
) {
63 /* In order to modify control info the caller must be
64 * owner, creator or privileged.
67 return (is_root(cred
) ? 0 : EACCES
);
69 /* Check for group match. */
71 if (!is_grpmember(perm
->gid
, cred
) &&
72 !is_grpmember(perm
->cgid
, cred
))
79 if ((mode
& perm
->mode
) == mode
)