1 /*-
2 * Copyright (c) 2001 Jake Burkholder.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: releng/10.1/sys/sparc64/sparc64/sys_machdep.c 255677 2013-09-18 19:26:08Z pjd $
27 */
28
29 #include "opt_capsicum.h"
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/capability.h>
34 #include <sys/lock.h>
35 #include <sys/malloc.h>
36 #include <sys/mutex.h>
37 #include <sys/proc.h>
38 #include <sys/sysproto.h>
39
40 #include <machine/md_var.h>
41 #include <machine/utrap.h>
42 #include <machine/sysarch.h>
43
44 static int sparc_sigtramp_install(struct thread *td, char *args);
45 static int sparc_utrap_install(struct thread *td, char *args);
46
47 #ifndef _SYS_SYSPROTO_H_
48 struct sysarch_args {
49 int op;
50 char *parms;
51 };
52 #endif
53
54 int
55 sysarch(struct thread *td, struct sysarch_args *uap)
56 {
57 int error;
58
59 #ifdef CAPABILITY_MODE
60 /*
61 * When adding new operations, add a new case statement here to
62 * explicitly indicate whether or not the operation is safe to
63 * perform in capability mode.
64 */
65 if (IN_CAPABILITY_MODE(td)) {
66 switch (uap->op) {
67 case SPARC_SIGTRAMP_INSTALL:
68 case SPARC_UTRAP_INSTALL:
69 break;
70
71 default:
72 #ifdef KTRACE
73 if (KTRPOINT(td, KTR_CAPFAIL))
74 ktrcapfail(CAPFAIL_SYSCALL, NULL, NULL);
75 #endif
76 return (ECAPMODE);
77 }
78 }
79 #endif
80
81 mtx_lock(&Giant);
82 switch (uap->op) {
83 case SPARC_SIGTRAMP_INSTALL:
84 error = sparc_sigtramp_install(td, uap->parms);
85 break;
86 case SPARC_UTRAP_INSTALL:
87 error = sparc_utrap_install(td, uap->parms);
88 break;
89 default:
90 error = EINVAL;
91 break;
92 }
93 mtx_unlock(&Giant);
94 return (error);
95 }
96
97 static int
98 sparc_sigtramp_install(struct thread *td, char *args)
99 {
100 struct sparc_sigtramp_install_args sia;
101 struct proc *p;
102 int error;
103
104 p = td->td_proc;
105 if ((error = copyin(args, &sia, sizeof(sia))) != 0)
106 return (error);
107 if (sia.sia_old != NULL) {
108 if (suword(sia.sia_old, (long)p->p_md.md_sigtramp) != 0)
109 return (EFAULT);
110 }
111 p->p_md.md_sigtramp = sia.sia_new;
112 return (0);
113 }
114
115 static int
116 sparc_utrap_install(struct thread *td, char *args)
117 {
118 struct sparc_utrap_install_args uia;
119 struct sparc_utrap_args ua;
120 struct md_utrap *ut;
121 int error;
122 int i;
123
124 ut = td->td_proc->p_md.md_utrap;
125 if ((error = copyin(args, &uia, sizeof(uia))) != 0)
126 return (error);
127 if (uia.num < 0 || uia.num > UT_MAX ||
128 (uia.handlers == NULL && uia.num > 0))
129 return (EINVAL);
130 for (i = 0; i < uia.num; i++) {
131 if ((error = copyin(&uia.handlers[i], &ua, sizeof(ua))) != 0)
132 return (error);
133 if (ua.type != UTH_NOCHANGE &&
134 (ua.type < 0 || ua.type >= UT_MAX))
135 return (EINVAL);
136 if (ua.old_deferred != NULL) {
137 if ((error = suword(ua.old_deferred, 0)) != 0)
138 return (error);
139 }
140 if (ua.old_precise != NULL) {
141 error = suword(ua.old_precise,
142 ut != NULL ? (long)ut->ut_precise[ua.type] : 0);
143 if (error != 0)
144 return (error);
145 }
146 if (ua.type != UTH_NOCHANGE) {
147 if (ut == NULL) {
148 ut = utrap_alloc();
149 td->td_proc->p_md.md_utrap = ut;
150 }
151 ut->ut_precise[ua.type] = ua.new_precise;
152 }
153 }
154 return (0);
155 }
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