1 /*-
2 * Copyright (c) 2001 Dag-Erling Co�dan Sm�rgrav
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 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD: stable/9/sys/fs/procfs/procfs_ioctl.c 225617 2011-09-16 13:58:51Z kmacy $
29 */
30
31 #include "opt_compat.h"
32
33 #include <sys/param.h>
34 #include <sys/lock.h>
35 #include <sys/mutex.h>
36 #include <sys/pioctl.h>
37 #include <sys/priv.h>
38 #include <sys/proc.h>
39 #include <sys/signalvar.h>
40 #include <sys/systm.h>
41
42 #include <fs/pseudofs/pseudofs.h>
43 #include <fs/procfs/procfs.h>
44
45 #ifdef COMPAT_FREEBSD32
46 struct procfs_status32 {
47 int state; /* Running, stopped, something else? */
48 int flags; /* Any flags */
49 unsigned int events; /* Events to stop on */
50 int why; /* What event, if any, proc stopped on */
51 unsigned int val; /* Any extra data */
52 };
53
54 #define PIOCWAIT32 _IOR('p', 4, struct procfs_status32)
55 #define PIOCSTATUS32 _IOR('p', 6, struct procfs_status32)
56 #endif
57
58 /*
59 * Process ioctls
60 */
61 int
procfs_ioctl(PFS_IOCTL_ARGS)62 procfs_ioctl(PFS_IOCTL_ARGS)
63 {
64 struct procfs_status *ps;
65 #ifdef COMPAT_FREEBSD32
66 struct procfs_status32 *ps32;
67 #endif
68 int error, flags, sig;
69 #ifdef COMPAT_FREEBSD6
70 int ival;
71 #endif
72
73 KASSERT(p != NULL,
74 ("%s() called without a process", __func__));
75 PROC_LOCK_ASSERT(p, MA_OWNED);
76
77 error = 0;
78 switch (cmd) {
79 #if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
80 case _IOC(IOC_IN, 'p', 1, 0):
81 #endif
82 #ifdef COMPAT_FREEBSD6
83 case _IO('p', 1):
84 ival = IOCPARM_IVAL(data);
85 data = &ival;
86 #endif
87 case PIOCBIS:
88 p->p_stops |= *(unsigned int *)data;
89 break;
90 #if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
91 case _IOC(IOC_IN, 'p', 2, 0):
92 #endif
93 #ifdef COMPAT_FREEBSD6
94 case _IO('p', 2):
95 ival = IOCPARM_IVAL(data);
96 data = &ival;
97 #endif
98 case PIOCBIC:
99 p->p_stops &= ~*(unsigned int *)data;
100 break;
101 #if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
102 case _IOC(IOC_IN, 'p', 3, 0):
103 #endif
104 #ifdef COMPAT_FREEBSD6
105 case _IO('p', 3):
106 ival = IOCPARM_IVAL(data);
107 data = &ival;
108 #endif
109 case PIOCSFL:
110 flags = *(unsigned int *)data;
111 if (flags & PF_ISUGID) {
112 /*
113 * XXXRW: Is this specific check required here, as
114 * p_candebug() should implement it, or other checks
115 * are missing.
116 */
117 error = priv_check(td, PRIV_DEBUG_SUGID);
118 if (error)
119 break;
120 }
121 p->p_pfsflags = flags;
122 break;
123 case PIOCGFL:
124 *(unsigned int *)data = p->p_pfsflags;
125 break;
126 case PIOCWAIT:
127 while (p->p_step == 0 && (p->p_flag & P_WEXIT) == 0) {
128 /* sleep until p stops */
129 _PHOLD(p);
130 error = msleep(&p->p_stype, &p->p_mtx,
131 PWAIT|PCATCH, "pioctl", 0);
132 _PRELE(p);
133 if (error != 0)
134 break;
135 }
136 /* fall through to PIOCSTATUS */
137 case PIOCSTATUS:
138 ps = (struct procfs_status *)data;
139 ps->state = (p->p_step == 0);
140 ps->flags = 0; /* nope */
141 ps->events = p->p_stops;
142 ps->why = p->p_step ? p->p_stype : 0;
143 ps->val = p->p_step ? p->p_xstat : 0;
144 break;
145 #ifdef COMPAT_FREEBSD32
146 case PIOCWAIT32:
147 while (p->p_step == 0 && (p->p_flag & P_WEXIT) == 0) {
148 /* sleep until p stops */
149 _PHOLD(p);
150 error = msleep(&p->p_stype, &p->p_mtx,
151 PWAIT|PCATCH, "pioctl", 0);
152 _PRELE(p);
153 if (error != 0)
154 break;
155 }
156 /* fall through to PIOCSTATUS32 */
157 case PIOCSTATUS32:
158 ps32 = (struct procfs_status32 *)data;
159 ps32->state = (p->p_step == 0);
160 ps32->flags = 0; /* nope */
161 ps32->events = p->p_stops;
162 ps32->why = p->p_step ? p->p_stype : 0;
163 ps32->val = p->p_step ? p->p_xstat : 0;
164 break;
165 #endif
166 #if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
167 case _IOC(IOC_IN, 'p', 5, 0):
168 #endif
169 #ifdef COMPAT_FREEBSD6
170 case _IO('p', 5):
171 ival = IOCPARM_IVAL(data);
172 data = &ival;
173 #endif
174 case PIOCCONT:
175 if (p->p_step == 0)
176 break;
177 sig = *(unsigned int *)data;
178 if (sig != 0 && !_SIG_VALID(sig)) {
179 error = EINVAL;
180 break;
181 }
182 #if 0
183 p->p_step = 0;
184 if (P_SHOULDSTOP(p)) {
185 p->p_xstat = sig;
186 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG);
187 PROC_SLOCK(p);
188 thread_unsuspend(p);
189 PROC_SUNLOCK(p);
190 } else if (sig)
191 kern_psignal(p, sig);
192 #else
193 if (sig)
194 kern_psignal(p, sig);
195 p->p_step = 0;
196 wakeup(&p->p_step);
197 #endif
198 break;
199 default:
200 error = (ENOTTY);
201 }
202
203 return (error);
204 }
205
206 /*
207 * Clean up on last close
208 */
209 int
procfs_close(PFS_CLOSE_ARGS)210 procfs_close(PFS_CLOSE_ARGS)
211 {
212 if (p != NULL && (p->p_pfsflags & PF_LINGER) == 0) {
213 PROC_LOCK_ASSERT(p, MA_OWNED);
214 p->p_pfsflags = 0;
215 p->p_stops = 0;
216 p->p_step = 0;
217 wakeup(&p->p_step);
218 }
219 return (0);
220 }
221