1 /** $MirOS: src/sys/ddb/db_usrreq.c,v 1.4 2013/10/31 20:06:50 tg Exp $ */
2 /* $OpenBSD: db_usrreq.c,v 1.9 2004/02/06 22:19:21 tedu Exp $ */
3
4 /*
5 * Copyright © 2006, 2013
6 * Thorsten “mirabilos” Glaser <tg@mirbsd.org>
7 * Copyright (c) 1996 Michael Shalayeff. All rights reserved.
8 * Copyright (c) 1986, 1988, 1991, 1993
9 * The Regents of the University of California. All rights reserved.
10 * (c) UNIX System Laboratories, Inc.
11 * All or some portions of this file are derived from material licensed
12 * to the University of California by American Telephone and Telegraph
13 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
14 * the permission of UNIX System Laboratories, Inc.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
24 * 3. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
29 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
30 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
31 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
33 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
37 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38 */
39
40 #include <sys/param.h>
41 #include <sys/types.h>
42 #include <sys/kernel.h>
43 #include <sys/proc.h>
44 #include <uvm/uvm_extern.h>
45 #include <sys/sysctl.h>
46
47 #include <ddb/db_output.h>
48 #include <ddb/db_var.h>
49
50 static void paniK(const char *, ...)
51 __attribute__((__format__(__kprintf__, 1, 2)));
52
53 int db_log = 1;
54 int db_allowcrash = 0;
55
56 int
ddb_sysctl(name,namelen,oldp,oldlenp,newp,newlen,p)57 ddb_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
58 int *name;
59 u_int namelen;
60 void *oldp;
61 size_t *oldlenp;
62 void *newp;
63 size_t newlen;
64 struct proc *p;
65 {
66 int error, ctlval;
67
68 /* All sysctl names at this level are terminal. */
69 if (namelen != 1)
70 return (ENOTDIR);
71
72 switch (name[0]) {
73
74 case DBCTL_RADIX:
75 return sysctl_int(oldp, oldlenp, newp, newlen, &db_radix);
76 case DBCTL_MAXWIDTH:
77 return sysctl_int(oldp, oldlenp, newp, newlen, &db_max_width);
78 case DBCTL_TABSTOP:
79 return sysctl_int(oldp, oldlenp, newp, newlen, &db_tab_stop_width);
80 case DBCTL_MAXLINE:
81 return sysctl_int(oldp, oldlenp, newp, newlen, &db_max_line);
82 case DBCTL_PANIC:
83 ctlval = db_panic;
84 if ((error = sysctl_int(oldp, oldlenp, newp, newlen, &ctlval)) ||
85 newp == NULL)
86 return (error);
87 if (ctlval != 1 && ctlval != 0)
88 return (EINVAL);
89 if (ctlval > db_panic && securelevel > 1)
90 return (EPERM);
91 db_panic = ctlval;
92 return (0);
93 case DBCTL_CONSOLE:
94 ctlval = db_console;
95 if ((error = sysctl_int(oldp, oldlenp, newp, newlen, &ctlval)) ||
96 newp == NULL)
97 return (error);
98 if (ctlval != 1 && ctlval != 0)
99 return (EINVAL);
100 if (ctlval > db_console && securelevel > 1)
101 return (EPERM);
102 db_console = ctlval;
103 return (0);
104 case DBCTL_LOG:
105 return (sysctl_int(oldp, oldlenp, newp, newlen, &db_log));
106 case DBCTL_CRASH:
107 ctlval = db_allowcrash;
108 if ((error = sysctl_int(oldp, oldlenp, newp, newlen, &ctlval)) ||
109 newp == NULL)
110 return (error);
111 switch (ctlval) {
112 case 0:
113 db_allowcrash = 0;
114 break;
115 case 1:
116 if (securelevel > 0)
117 return (EPERM);
118 db_allowcrash = 1;
119 break;
120 default:
121 if (!db_allowcrash)
122 return (EPERM);
123 paniK("ddb user requested panic: sysctl ddb.crash=%d",
124 ctlval);
125 printf("db_usrreq.c: recovering sysop after panik\n");
126 }
127 return (0);
128 default:
129 return (EOPNOTSUPP);
130 }
131 /* NOTREACHED */
132 }
133
134 /* this comes from panic() in kern/subr_prf.c - keep it in sync */
135 static void
paniK(const char * fmt,...)136 paniK(const char *fmt, ...)
137 {
138 va_list ap;
139 void (*tmp_panic_hook)(void) = panic_hook;
140
141 if (panic_hook) {
142 panic_hook = NULL;
143 tmp_panic_hook();
144 }
145
146 printf("panic: ");
147 va_start(ap, fmt);
148 vprintf(fmt, ap);
149 printf("\n");
150 va_end(ap);
151
152 #ifdef KGDB
153 kgdb_panic();
154 #endif
155 #ifdef KADB
156 if (boothowto & RB_KDB)
157 kdbpanic();
158 #endif
159 #ifdef DDB
160 if (db_panic)
161 Debugger();
162 else
163 db_stack_dump();
164 #endif
165
166 panic_hook = tmp_panic_hook;
167 }
168