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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
26: /*-
27: * Copyright (c) 1982, 1986, 1989, 1993
28: * The Regents of the University of California. All rights reserved.
29: * (c) UNIX System Laboratories, Inc.
30: * All or some portions of this file are derived from material licensed
31: * to the University of California by American Telephone and Telegraph
32: * Co. or Unix System Laboratories, Inc. and are reproduced herein with
33: * the permission of UNIX System Laboratories, Inc.
34: *
35: * Redistribution and use in source and binary forms, with or without
36: * modification, are permitted provided that the following conditions
37: * are met:
38: * 1. Redistributions of source code must retain the above copyright
39: * notice, this list of conditions and the following disclaimer.
40: * 2. Redistributions in binary form must reproduce the above copyright
41: * notice, this list of conditions and the following disclaimer in the
42: * documentation and/or other materials provided with the distribution.
43: * 3. All advertising materials mentioning features or use of this software
44: * must display the following acknowledgement:
45: * This product includes software developed by the University of
46: * California, Berkeley and its contributors.
47: * 4. Neither the name of the University nor the names of its contributors
48: * may be used to endorse or promote products derived from this software
49: * without specific prior written permission.
50: *
51: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
52: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
53: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
54: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
55: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
56: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
57: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
58: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
59: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
60: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
61: * SUCH DAMAGE.
62: *
63: * from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93
64: */
65: /*
66: * HISTORY
67: *
68: * 10-Jun-97 Umesh Vaishampayan ([email protected])
69: * Ported to PPC. Cleaned up the architecture specific code.
70: */
71:
72: #import <machine/reg.h>
73: #import <machine/psl.h>
74:
75: #include <sys/param.h>
76: #include <sys/systm.h>
77: #include <sys/proc.h>
78: #include <sys/errno.h>
79: #include <sys/ptrace.h>
80: #include <sys/uio.h>
81: #include <sys/user.h>
82: #include <sys/sysctl.h>
83:
84: #include <sys/mount.h>
85:
86: #import <kern/task.h>
87: #import <kern/thread.h>
88: #import <kern/sched_prim.h>
89:
90: #import <vm/vm_map.h>
91: #import <mach/vm_param.h>
92: #import <mach/vm_prot.h>
93: #import <vm/vm_kern.h>
94: #if defined(ppc)
95: #include <machdep/ppc/proc_reg.h>
96: #endif /* ppc */
97: /* Macros to clear/set/test flags. */
98: #define SET(t, f) (t) |= (f)
99: #define CLR(t, f) (t) &= ~(f)
100: #define ISSET(t, f) ((t) & (f))
101:
102: /*
103: * sys-trace system call.
104: */
105: struct ptrace_args {
106: int req;
107: pid_t pid;
108: caddr_t addr;
109: int data;
110: };
111: int
112: ptrace(p, uap, retval)
113: struct proc *p;
114: struct ptrace_args *uap;
115: register_t *retval;
116: {
117: struct proc *t = current_proc(); /* target process */
118: vm_map_t victim_map;
119: vm_offset_t start_addr, end_addr,
120: kern_addr, offset;
121: vm_size_t size;
122: boolean_t change_protection;
123: task_t task;
124: thread_t thread;
125: int *locr0;
126: int error = 0;
127:
128: /*
129: * Intercept and deal with "please trace me" request.
130: */
131: if (uap->req == PT_TRACE_ME) {
132: SET(p->p_flag, P_TRACED);
133: /* Non-attached case, our tracer is our parent. */
134: t->p_oppid = t->p_pptr->p_pid;
135: return(0);
136: }
137:
138: /*
139: * Locate victim, and make sure it is traceable.
140: */
141: if ((t = pfind(uap->pid)) == NULL)
142: return (ESRCH);
143:
144: task = t->task;
145: if (uap->req == PT_ATTACH) {
146:
147: /*
148: * You can't attach to a process if:
149: * (1) it's the process that's doing the attaching,
150: */
151: if (t->p_pid == p->p_pid)
152: return (EINVAL);
153:
154: /*
155: * (2) it's already being traced, or
156: */
157: if (ISSET(t->p_flag, P_TRACED))
158: return (EBUSY);
159:
160: /*
161: * (3) it's not owned by you, or is set-id on exec
162: * (unless you're root).
163: */
164: if ((t->p_cred->p_ruid != p->p_cred->p_ruid ||
165: ISSET(t->p_flag, P_SUGID)) &&
166: (error = suser(p->p_ucred, &p->p_acflag)) != 0)
167: return (error);
168:
169: SET(t->p_flag, P_TRACED);
170: t->p_oppid = t->p_pptr->p_pid;
171: if (t->p_pptr != p)
172: proc_reparent(t, p);
173: t->p_xstat = 0; /* XXX ? */
174: /* Halt it dead in its tracks. */
175: psignal(t, SIGSTOP);
176: return(0);
177: }
178:
179: /*
180: * You can't do what you want to the process if:
181: * (1) It's not being traced at all,
182: */
183: if (!ISSET(t->p_flag, P_TRACED))
184: return (EPERM);
185:
186: /*
187: * (2) it's not being traced by _you_, or
188: */
189: if (t->p_pptr != p)
190: return (EBUSY);
191:
192: /*
193: * (3) it's not currently stopped.
194: */
195: if (task->user_stop_count == 0 || t->p_stat != SSTOP)
196: return (EBUSY);
197:
198: /*
199: * Mach version of ptrace executes request directly here,
200: * thus simplifying the interaction of ptrace and signals.
201: */
202: switch (uap->req) {
203:
204: case PT_DETACH:
205: if (t->p_oppid != t->p_pptr->p_pid) {
206: struct proc *pp;
207:
208: pp = pfind(t->p_oppid);
209: proc_reparent(t, pp ? pp : initproc);
210: }
211:
212: t->p_oppid = 0;
213: CLR(t->p_flag, P_TRACED);
214: goto resume;
215:
216: case PT_KILL:
217: /*
218: * Tell child process to kill itself after it
219: * is resumed by adding NSIG to p_cursig. [see issig]
220: */
221: psignal(t, SIGKILL);
222: goto resume;
223:
224: case PT_STEP: /* single step the child */
225: case PT_CONTINUE: /* continue the child */
226: thread = (thread_t) queue_first(&task->thread_list);
227: locr0 = thread->_uthread->uu_ar0;
228: if ((int)uap->addr != 1) {
229: #if defined(i386)
230: locr0[PC] = (int)uap->addr;
231: #elif defined(ppc)
232: #define ALIGNED(addr,size) (((unsigned)(addr)&((size)-1))==0)
233: if (!ALIGNED((int)uap->addr, sizeof(int)))
234: return (ERESTART);
235:
236: #if defined(ppc)
237: thread->pcb->ss.srr0 = (int)uap->addr;
238: #endif /* ppc */
239: #undef ALIGNED
240: #else
241: #error architecture not implemented!
242: #endif
243: } /* (int)uap->addr != 1 */
244:
245: if ((unsigned)uap->data < 0 || (unsigned)uap->data >= NSIG)
246: goto errorLabel;
247:
248: if (uap->data != 0)
249: psignal(t, uap->data);
250:
251:
252: if (uap->req == PT_STEP) {
253: #if defined(i386)
254: locr0[PS] |= PSL_T;
255: #elif defined(ppc)
256: thread->pcb->ss.srr1 |= MASK(MSR_SE);
257: #else
258: #error architecture not implemented!
259: #endif
260: } /* uap->req == PT_STEP */
261: else { /* PT_CONTINUE - clear trace bit if set */
262: #if defined(i386)
263: locr0[PS] &= ~PSL_T;
264: #elif defined(ppc)
265: thread->pcb->ss.srr1 &= ~MASK(MSR_SE);
266: #endif
267: }
268:
269: resume:
270: t->p_stat = SRUN;
271: t->p_xstat = uap->data;
272: task_resume(task);
273: break;
274:
275: default:
276: errorLabel:
277: return(EINVAL);
278: }
279: return(0);
280: }
281:
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