The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/sys_process.c

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    1 /*      $NetBSD: sys_process.c,v 1.180 2020/05/26 00:50:53 kamil Exp $  */
    2 
    3 /*-
    4  * Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Andrew Doran.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   29  * POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 /*-
   33  * Copyright (c) 1982, 1986, 1989, 1993
   34  *      The Regents of the University of California.  All rights reserved.
   35  * (c) UNIX System Laboratories, Inc.
   36  * All or some portions of this file are derived from material licensed
   37  * to the University of California by American Telephone and Telegraph
   38  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   39  * the permission of UNIX System Laboratories, Inc.
   40  *
   41  * This code is derived from software contributed to Berkeley by
   42  * Jan-Simon Pendry.
   43  *
   44  * Redistribution and use in source and binary forms, with or without
   45  * modification, are permitted provided that the following conditions
   46  * are met:
   47  * 1. Redistributions of source code must retain the above copyright
   48  *    notice, this list of conditions and the following disclaimer.
   49  * 2. Redistributions in binary form must reproduce the above copyright
   50  *    notice, this list of conditions and the following disclaimer in the
   51  *    documentation and/or other materials provided with the distribution.
   52  * 3. Neither the name of the University nor the names of its contributors
   53  *    may be used to endorse or promote products derived from this software
   54  *    without specific prior written permission.
   55  *
   56  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   57  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   58  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   59  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   60  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   61  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   62  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   63  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   64  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   65  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   66  * SUCH DAMAGE.
   67  *
   68  *      from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93
   69  */
   70 
   71 /*-
   72  * Copyright (c) 1993 Jan-Simon Pendry.
   73  * Copyright (c) 1994 Christopher G. Demetriou.  All rights reserved.
   74  *
   75  * This code is derived from software contributed to Berkeley by
   76  * Jan-Simon Pendry.
   77  *
   78  * Redistribution and use in source and binary forms, with or without
   79  * modification, are permitted provided that the following conditions
   80  * are met:
   81  * 1. Redistributions of source code must retain the above copyright
   82  *    notice, this list of conditions and the following disclaimer.
   83  * 2. Redistributions in binary form must reproduce the above copyright
   84  *    notice, this list of conditions and the following disclaimer in the
   85  *    documentation and/or other materials provided with the distribution.
   86  * 3. All advertising materials mentioning features or use of this software
   87  *    must display the following acknowledgement:
   88  *      This product includes software developed by the University of
   89  *      California, Berkeley and its contributors.
   90  * 4. Neither the name of the University nor the names of its contributors
   91  *    may be used to endorse or promote products derived from this software
   92  *    without specific prior written permission.
   93  *
   94  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   95  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   96  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   97  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   98  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   99  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  100  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  101  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  102  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  103  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  104  * SUCH DAMAGE.
  105  *
  106  *      from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93
  107  */
  108 
  109 /*
  110  * References:
  111  *      (1) Bach's "The Design of the UNIX Operating System",
  112  *      (2) sys/miscfs/procfs from UCB's 4.4BSD-Lite distribution,
  113  *      (3) the "4.4BSD Programmer's Reference Manual" published
  114  *              by USENIX and O'Reilly & Associates.
  115  * The 4.4BSD PRM does a reasonably good job of documenting what the various
  116  * ptrace() requests should actually do, and its text is quoted several times
  117  * in this file.
  118  */
  119 
  120 #include <sys/cdefs.h>
  121 __KERNEL_RCSID(0, "$NetBSD: sys_process.c,v 1.180 2020/05/26 00:50:53 kamil Exp $");
  122 
  123 #ifdef _KERNEL_OPT
  124 #include "opt_ptrace.h"
  125 #include "opt_ktrace.h"
  126 #include "opt_pax.h"
  127 #endif
  128 
  129 #include <sys/param.h>
  130 #include <sys/systm.h>
  131 #include <sys/proc.h>
  132 #include <sys/errno.h>
  133 #include <sys/exec.h>
  134 #include <sys/pax.h>
  135 #include <sys/ptrace.h>
  136 #include <sys/uio.h>
  137 #include <sys/ras.h>
  138 #include <sys/kmem.h>
  139 #include <sys/kauth.h>
  140 #include <sys/mount.h>
  141 #include <sys/syscallargs.h>
  142 
  143 #include <uvm/uvm_extern.h>
  144 
  145 #include <machine/reg.h>
  146 
  147 #if defined(KTRACE) || defined(PTRACE_HOOKS)
  148 int
  149 process_domem(struct lwp *curl /*tracer*/,
  150     struct lwp *l /*traced*/,
  151     struct uio *uio)
  152 {
  153         struct proc *p = l->l_proc;     /* traced */
  154         struct vmspace *vm;
  155         int error;
  156 
  157         size_t len;
  158 
  159         error = 0;
  160         len = uio->uio_resid;
  161 
  162         if (len == 0)
  163                 return 0;
  164 
  165 #ifdef PMAP_NEED_PROCWR
  166         vaddr_t addr = uio->uio_offset;
  167 #endif
  168 
  169         vm = p->p_vmspace;
  170 
  171         if ((l->l_flag & LW_WEXIT) || vm->vm_refcnt < 1)
  172                 error = EFAULT;
  173         if (error == 0)
  174                 uvmspace_addref(p->p_vmspace);
  175         if (error != 0)
  176                 return error;
  177         error = uvm_io(&vm->vm_map, uio, pax_mprotect_prot(l));
  178 
  179 #ifdef PMAP_NEED_PROCWR
  180         if (error == 0 && uio->uio_rw == UIO_WRITE)
  181                 pmap_procwr(p, addr, len);
  182 #endif
  183         uvmspace_free(vm);
  184 
  185         return error;
  186 }
  187 #endif  /* KTRACE || PTRACE_HOOKS */
  188 
  189 /*
  190  * Dummy routine so that ptrace_common module will fail to load if this
  191  * routine is not defined.
  192  */
  193 #if defined(PTRACE_HOOKS)
  194 void
  195 ptrace_hooks(void)
  196 {
  197 
  198 }
  199 #endif

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