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Annotation of kernel/bsd/kern/mach_process.c, revision 1.1

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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