| 1 | /* $NetBSD: sys_process.c,v 1.175 2016/11/02 00:11:59 pgoyette 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 1.175 2016/11/02 00:11:59 pgoyette 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 | #ifdef PMAP_NEED_PROCWR |
| 159 | vaddr_t addr; |
| 160 | #endif |
| 161 | |
| 162 | error = 0; |
| 163 | len = uio->uio_resid; |
| 164 | |
| 165 | if (len == 0) |
| 166 | return 0; |
| 167 | |
| 168 | #ifdef PMAP_NEED_PROCWR |
| 169 | addr = uio->uio_offset; |
| 170 | #endif |
| 171 | |
| 172 | vm = p->p_vmspace; |
| 173 | |
| 174 | mutex_enter(&vm->vm_map.misc_lock); |
| 175 | if ((l->l_flag & LW_WEXIT) || vm->vm_refcnt < 1) |
| 176 | error = EFAULT; |
| 177 | if (error == 0) |
| 178 | p->p_vmspace->vm_refcnt++; /* XXX */ |
| 179 | mutex_exit(&vm->vm_map.misc_lock); |
| 180 | if (error != 0) |
| 181 | return error; |
| 182 | error = uvm_io(&vm->vm_map, uio, pax_mprotect_prot(l)); |
| 183 | uvmspace_free(vm); |
| 184 | |
| 185 | #ifdef PMAP_NEED_PROCWR |
| 186 | if (error == 0 && uio->uio_rw == UIO_WRITE) |
| 187 | pmap_procwr(p, addr, len); |
| 188 | #endif |
| 189 | return error; |
| 190 | } |
| 191 | |
| 192 | void |
| 193 | process_stoptrace(void) |
| 194 | { |
| 195 | struct lwp *l = curlwp; |
| 196 | struct proc *p = l->l_proc, *pp; |
| 197 | |
| 198 | mutex_enter(proc_lock); |
| 199 | mutex_enter(p->p_lock); |
| 200 | pp = p->p_pptr; |
| 201 | if (pp->p_pid == 1) { |
| 202 | CLR(p->p_slflag, PSL_SYSCALL); /* XXXSMP */ |
| 203 | mutex_exit(p->p_lock); |
| 204 | mutex_exit(proc_lock); |
| 205 | return; |
| 206 | } |
| 207 | |
| 208 | p->p_xsig = SIGTRAP; |
| 209 | proc_stop(p, 1, SIGSTOP); |
| 210 | mutex_exit(proc_lock); |
| 211 | |
| 212 | if (sigispending(l, 0)) { |
| 213 | lwp_lock(l); |
| 214 | l->l_flag |= LW_PENDSIG; |
| 215 | lwp_unlock(l); |
| 216 | } |
| 217 | mutex_exit(p->p_lock); |
| 218 | } |
| 219 | #endif /* KTRACE || PTRACE_HOOKS */ |
| 220 | |
| 221 | /* |
| 222 | * Dummy routine so that ptrace_common module will fail to load if this |
| 223 | * routine is not defined. |
| 224 | */ |
| 225 | #if defined(PTRACE_HOOKS) |
| 226 | void |
| 227 | ptrace_hooks(void) |
| 228 | { |
| 229 | |
| 230 | } |
| 231 | #endif |
| 232 | |