1 /* $NetBSD: procfs_auxv.c,v 1.4 2019/09/27 14:36:18 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2017 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31 #include <sys/cdefs.h>
32 __KERNEL_RCSID(0, "$NetBSD: procfs_auxv.c,v 1.4 2019/09/27 14:36:18 christos Exp $");
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/proc.h>
37 #include <sys/kmem.h>
38
39 #include <miscfs/procfs/procfs.h>
40
41 int
procfs_doauxv(struct lwp * curl,struct proc * p,struct pfsnode * pfs,struct uio * uio)42 procfs_doauxv(struct lwp *curl, struct proc *p, struct pfsnode *pfs,
43 struct uio *uio)
44 {
45 int error;
46 void *buffer;
47 size_t bufsize;
48
49 if (uio->uio_rw != UIO_READ)
50 return EOPNOTSUPP;
51
52 if ((error = proc_getauxv(p, &buffer, &bufsize)) != 0)
53 return error;
54
55 if ((uintmax_t)uio->uio_offset < bufsize)
56 error = uiomove((char *)buffer + uio->uio_offset,
57 bufsize - uio->uio_offset, uio);
58 else
59 error = 0;
60
61 kmem_free(buffer, bufsize);
62 return error;
63 }
64
65 int
procfs_validauxv(struct lwp * l,struct mount * mp)66 procfs_validauxv(struct lwp *l, struct mount *mp)
67 {
68 return l != NULL && l->l_proc != NULL && l->l_proc->p_execsw != NULL;
69 }
70