sys_ptrace_common.c revision 1.5.2.2
1 1.5.2.2 skrll /* $NetBSD: sys_ptrace_common.c,v 1.5.2.2 2016/12/05 10:55:26 skrll Exp $ */ 2 1.5.2.2 skrll 3 1.5.2.2 skrll /*- 4 1.5.2.2 skrll * Copyright (c) 2008, 2009 The NetBSD Foundation, Inc. 5 1.5.2.2 skrll * All rights reserved. 6 1.5.2.2 skrll * 7 1.5.2.2 skrll * This code is derived from software contributed to The NetBSD Foundation 8 1.5.2.2 skrll * by Andrew Doran. 9 1.5.2.2 skrll * 10 1.5.2.2 skrll * Redistribution and use in source and binary forms, with or without 11 1.5.2.2 skrll * modification, are permitted provided that the following conditions 12 1.5.2.2 skrll * are met: 13 1.5.2.2 skrll * 1. Redistributions of source code must retain the above copyright 14 1.5.2.2 skrll * notice, this list of conditions and the following disclaimer. 15 1.5.2.2 skrll * 2. Redistributions in binary form must reproduce the above copyright 16 1.5.2.2 skrll * notice, this list of conditions and the following disclaimer in the 17 1.5.2.2 skrll * documentation and/or other materials provided with the distribution. 18 1.5.2.2 skrll * 19 1.5.2.2 skrll * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.5.2.2 skrll * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.5.2.2 skrll * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.5.2.2 skrll * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.5.2.2 skrll * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.5.2.2 skrll * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.5.2.2 skrll * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.5.2.2 skrll * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.5.2.2 skrll * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.5.2.2 skrll * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.5.2.2 skrll * POSSIBILITY OF SUCH DAMAGE. 30 1.5.2.2 skrll */ 31 1.5.2.2 skrll 32 1.5.2.2 skrll /*- 33 1.5.2.2 skrll * Copyright (c) 1982, 1986, 1989, 1993 34 1.5.2.2 skrll * The Regents of the University of California. All rights reserved. 35 1.5.2.2 skrll * (c) UNIX System Laboratories, Inc. 36 1.5.2.2 skrll * All or some portions of this file are derived from material licensed 37 1.5.2.2 skrll * to the University of California by American Telephone and Telegraph 38 1.5.2.2 skrll * Co. or Unix System Laboratories, Inc. and are reproduced herein with 39 1.5.2.2 skrll * the permission of UNIX System Laboratories, Inc. 40 1.5.2.2 skrll * 41 1.5.2.2 skrll * This code is derived from software contributed to Berkeley by 42 1.5.2.2 skrll * Jan-Simon Pendry. 43 1.5.2.2 skrll * 44 1.5.2.2 skrll * Redistribution and use in source and binary forms, with or without 45 1.5.2.2 skrll * modification, are permitted provided that the following conditions 46 1.5.2.2 skrll * are met: 47 1.5.2.2 skrll * 1. Redistributions of source code must retain the above copyright 48 1.5.2.2 skrll * notice, this list of conditions and the following disclaimer. 49 1.5.2.2 skrll * 2. Redistributions in binary form must reproduce the above copyright 50 1.5.2.2 skrll * notice, this list of conditions and the following disclaimer in the 51 1.5.2.2 skrll * documentation and/or other materials provided with the distribution. 52 1.5.2.2 skrll * 3. Neither the name of the University nor the names of its contributors 53 1.5.2.2 skrll * may be used to endorse or promote products derived from this software 54 1.5.2.2 skrll * without specific prior written permission. 55 1.5.2.2 skrll * 56 1.5.2.2 skrll * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 57 1.5.2.2 skrll * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 58 1.5.2.2 skrll * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 59 1.5.2.2 skrll * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 60 1.5.2.2 skrll * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 61 1.5.2.2 skrll * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 62 1.5.2.2 skrll * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 1.5.2.2 skrll * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 64 1.5.2.2 skrll * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 65 1.5.2.2 skrll * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 66 1.5.2.2 skrll * SUCH DAMAGE. 67 1.5.2.2 skrll * 68 1.5.2.2 skrll * from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93 69 1.5.2.2 skrll */ 70 1.5.2.2 skrll 71 1.5.2.2 skrll /*- 72 1.5.2.2 skrll * Copyright (c) 1993 Jan-Simon Pendry. 73 1.5.2.2 skrll * Copyright (c) 1994 Christopher G. Demetriou. All rights reserved. 74 1.5.2.2 skrll * 75 1.5.2.2 skrll * This code is derived from software contributed to Berkeley by 76 1.5.2.2 skrll * Jan-Simon Pendry. 77 1.5.2.2 skrll * 78 1.5.2.2 skrll * Redistribution and use in source and binary forms, with or without 79 1.5.2.2 skrll * modification, are permitted provided that the following conditions 80 1.5.2.2 skrll * are met: 81 1.5.2.2 skrll * 1. Redistributions of source code must retain the above copyright 82 1.5.2.2 skrll * notice, this list of conditions and the following disclaimer. 83 1.5.2.2 skrll * 2. Redistributions in binary form must reproduce the above copyright 84 1.5.2.2 skrll * notice, this list of conditions and the following disclaimer in the 85 1.5.2.2 skrll * documentation and/or other materials provided with the distribution. 86 1.5.2.2 skrll * 3. All advertising materials mentioning features or use of this software 87 1.5.2.2 skrll * must display the following acknowledgement: 88 1.5.2.2 skrll * This product includes software developed by the University of 89 1.5.2.2 skrll * California, Berkeley and its contributors. 90 1.5.2.2 skrll * 4. Neither the name of the University nor the names of its contributors 91 1.5.2.2 skrll * may be used to endorse or promote products derived from this software 92 1.5.2.2 skrll * without specific prior written permission. 93 1.5.2.2 skrll * 94 1.5.2.2 skrll * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 95 1.5.2.2 skrll * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 96 1.5.2.2 skrll * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 97 1.5.2.2 skrll * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 98 1.5.2.2 skrll * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 99 1.5.2.2 skrll * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 100 1.5.2.2 skrll * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 101 1.5.2.2 skrll * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 102 1.5.2.2 skrll * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 103 1.5.2.2 skrll * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 104 1.5.2.2 skrll * SUCH DAMAGE. 105 1.5.2.2 skrll * 106 1.5.2.2 skrll * from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93 107 1.5.2.2 skrll */ 108 1.5.2.2 skrll 109 1.5.2.2 skrll /* 110 1.5.2.2 skrll * References: 111 1.5.2.2 skrll * (1) Bach's "The Design of the UNIX Operating System", 112 1.5.2.2 skrll * (2) sys/miscfs/procfs from UCB's 4.4BSD-Lite distribution, 113 1.5.2.2 skrll * (3) the "4.4BSD Programmer's Reference Manual" published 114 1.5.2.2 skrll * by USENIX and O'Reilly & Associates. 115 1.5.2.2 skrll * The 4.4BSD PRM does a reasonably good job of documenting what the various 116 1.5.2.2 skrll * ptrace() requests should actually do, and its text is quoted several times 117 1.5.2.2 skrll * in this file. 118 1.5.2.2 skrll */ 119 1.5.2.2 skrll 120 1.5.2.2 skrll #include <sys/cdefs.h> 121 1.5.2.2 skrll __KERNEL_RCSID(0, "$NetBSD: sys_ptrace_common.c,v 1.5.2.2 2016/12/05 10:55:26 skrll Exp $"); 122 1.5.2.2 skrll 123 1.5.2.2 skrll #ifdef _KERNEL_OPT 124 1.5.2.2 skrll #include "opt_ptrace.h" 125 1.5.2.2 skrll #include "opt_ktrace.h" 126 1.5.2.2 skrll #include "opt_pax.h" 127 1.5.2.2 skrll #endif 128 1.5.2.2 skrll 129 1.5.2.2 skrll #include <sys/param.h> 130 1.5.2.2 skrll #include <sys/systm.h> 131 1.5.2.2 skrll #include <sys/proc.h> 132 1.5.2.2 skrll #include <sys/errno.h> 133 1.5.2.2 skrll #include <sys/exec.h> 134 1.5.2.2 skrll #include <sys/pax.h> 135 1.5.2.2 skrll #include <sys/ptrace.h> 136 1.5.2.2 skrll #include <sys/uio.h> 137 1.5.2.2 skrll #include <sys/ras.h> 138 1.5.2.2 skrll #include <sys/kmem.h> 139 1.5.2.2 skrll #include <sys/kauth.h> 140 1.5.2.2 skrll #include <sys/mount.h> 141 1.5.2.2 skrll #include <sys/syscallargs.h> 142 1.5.2.2 skrll #include <sys/module.h> 143 1.5.2.2 skrll #include <sys/condvar.h> 144 1.5.2.2 skrll #include <sys/mutex.h> 145 1.5.2.2 skrll 146 1.5.2.2 skrll #include <uvm/uvm_extern.h> 147 1.5.2.2 skrll 148 1.5.2.2 skrll #include <machine/reg.h> 149 1.5.2.2 skrll 150 1.5.2.2 skrll #ifdef PTRACE 151 1.5.2.2 skrll 152 1.5.2.2 skrll # ifdef DEBUG 153 1.5.2.2 skrll # define DPRINTF(a) uprintf a 154 1.5.2.2 skrll # else 155 1.5.2.2 skrll # define DPRINTF(a) 156 1.5.2.2 skrll # endif 157 1.5.2.2 skrll 158 1.5.2.2 skrll static kauth_listener_t ptrace_listener; 159 1.5.2.2 skrll static int process_auxv_offset(struct proc *, struct uio *); 160 1.5.2.2 skrll 161 1.5.2.2 skrll #if 0 162 1.5.2.2 skrll static int ptrace_cbref; 163 1.5.2.2 skrll static kmutex_t ptrace_mtx; 164 1.5.2.2 skrll static kcondvar_t ptrace_cv; 165 1.5.2.2 skrll #endif 166 1.5.2.2 skrll 167 1.5.2.2 skrll static int 168 1.5.2.2 skrll ptrace_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 169 1.5.2.2 skrll void *arg0, void *arg1, void *arg2, void *arg3) 170 1.5.2.2 skrll { 171 1.5.2.2 skrll struct proc *p; 172 1.5.2.2 skrll int result; 173 1.5.2.2 skrll 174 1.5.2.2 skrll result = KAUTH_RESULT_DEFER; 175 1.5.2.2 skrll p = arg0; 176 1.5.2.2 skrll 177 1.5.2.2 skrll #if 0 178 1.5.2.2 skrll mutex_enter(&ptrace_mtx); 179 1.5.2.2 skrll ptrace_cbref++; 180 1.5.2.2 skrll mutex_exit(&ptrace_mtx); 181 1.5.2.2 skrll #endif 182 1.5.2.2 skrll if (action != KAUTH_PROCESS_PTRACE) 183 1.5.2.2 skrll goto out; 184 1.5.2.2 skrll 185 1.5.2.2 skrll switch ((u_long)arg1) { 186 1.5.2.2 skrll case PT_TRACE_ME: 187 1.5.2.2 skrll case PT_ATTACH: 188 1.5.2.2 skrll case PT_WRITE_I: 189 1.5.2.2 skrll case PT_WRITE_D: 190 1.5.2.2 skrll case PT_READ_I: 191 1.5.2.2 skrll case PT_READ_D: 192 1.5.2.2 skrll case PT_IO: 193 1.5.2.2 skrll #ifdef PT_GETREGS 194 1.5.2.2 skrll case PT_GETREGS: 195 1.5.2.2 skrll #endif 196 1.5.2.2 skrll #ifdef PT_SETREGS 197 1.5.2.2 skrll case PT_SETREGS: 198 1.5.2.2 skrll #endif 199 1.5.2.2 skrll #ifdef PT_GETFPREGS 200 1.5.2.2 skrll case PT_GETFPREGS: 201 1.5.2.2 skrll #endif 202 1.5.2.2 skrll #ifdef PT_SETFPREGS 203 1.5.2.2 skrll case PT_SETFPREGS: 204 1.5.2.2 skrll #endif 205 1.5.2.2 skrll case PT_SET_EVENT_MASK: 206 1.5.2.2 skrll case PT_GET_EVENT_MASK: 207 1.5.2.2 skrll case PT_GET_PROCESS_STATE: 208 1.5.2.2 skrll #ifdef __HAVE_PTRACE_MACHDEP 209 1.5.2.2 skrll PTRACE_MACHDEP_REQUEST_CASES 210 1.5.2.2 skrll #endif 211 1.5.2.2 skrll if (kauth_cred_getuid(cred) != kauth_cred_getuid(p->p_cred) || 212 1.5.2.2 skrll ISSET(p->p_flag, PK_SUGID)) { 213 1.5.2.2 skrll break; 214 1.5.2.2 skrll } 215 1.5.2.2 skrll 216 1.5.2.2 skrll result = KAUTH_RESULT_ALLOW; 217 1.5.2.2 skrll 218 1.5.2.2 skrll break; 219 1.5.2.2 skrll 220 1.5.2.2 skrll #ifdef PT_STEP 221 1.5.2.2 skrll case PT_STEP: 222 1.5.2.2 skrll #endif 223 1.5.2.2 skrll case PT_CONTINUE: 224 1.5.2.2 skrll case PT_KILL: 225 1.5.2.2 skrll case PT_DETACH: 226 1.5.2.2 skrll case PT_LWPINFO: 227 1.5.2.2 skrll case PT_SYSCALL: 228 1.5.2.2 skrll case PT_SYSCALLEMU: 229 1.5.2.2 skrll case PT_DUMPCORE: 230 1.5.2.2 skrll result = KAUTH_RESULT_ALLOW; 231 1.5.2.2 skrll break; 232 1.5.2.2 skrll 233 1.5.2.2 skrll default: 234 1.5.2.2 skrll break; 235 1.5.2.2 skrll } 236 1.5.2.2 skrll 237 1.5.2.2 skrll out: 238 1.5.2.2 skrll #if 0 239 1.5.2.2 skrll mutex_enter(&ptrace_mtx); 240 1.5.2.2 skrll if (--ptrace_cbref == 0) 241 1.5.2.2 skrll cv_broadcast(&ptrace_cv); 242 1.5.2.2 skrll mutex_exit(&ptrace_mtx); 243 1.5.2.2 skrll #endif 244 1.5.2.2 skrll 245 1.5.2.2 skrll return result; 246 1.5.2.2 skrll } 247 1.5.2.2 skrll 248 1.5.2.2 skrll int 249 1.5.2.2 skrll ptrace_init(void) 250 1.5.2.2 skrll { 251 1.5.2.2 skrll 252 1.5.2.2 skrll #if 0 253 1.5.2.2 skrll mutex_init(&ptrace_mtx, MUTEX_DEFAULT, IPL_NONE); 254 1.5.2.2 skrll cv_init(&ptrace_cv, "ptracecb"); 255 1.5.2.2 skrll ptrace_cbref = 0; 256 1.5.2.2 skrll #endif 257 1.5.2.2 skrll ptrace_listener = kauth_listen_scope(KAUTH_SCOPE_PROCESS, 258 1.5.2.2 skrll ptrace_listener_cb, NULL); 259 1.5.2.2 skrll return 0; 260 1.5.2.2 skrll } 261 1.5.2.2 skrll 262 1.5.2.2 skrll int 263 1.5.2.2 skrll ptrace_fini(void) 264 1.5.2.2 skrll { 265 1.5.2.2 skrll 266 1.5.2.2 skrll kauth_unlisten_scope(ptrace_listener); 267 1.5.2.2 skrll 268 1.5.2.2 skrll #if 0 269 1.5.2.2 skrll /* Make sure no-one is executing our kauth listener */ 270 1.5.2.2 skrll 271 1.5.2.2 skrll mutex_enter(&ptrace_mtx); 272 1.5.2.2 skrll while (ptrace_cbref != 0) 273 1.5.2.2 skrll cv_wait(&ptrace_cv, &ptrace_mtx); 274 1.5.2.2 skrll mutex_exit(&ptrace_mtx); 275 1.5.2.2 skrll mutex_destroy(&ptrace_mtx); 276 1.5.2.2 skrll cv_destroy(&ptrace_cv); 277 1.5.2.2 skrll #endif 278 1.5.2.2 skrll 279 1.5.2.2 skrll return 0; 280 1.5.2.2 skrll } 281 1.5.2.2 skrll 282 1.5.2.2 skrll int 283 1.5.2.2 skrll do_ptrace(struct ptrace_methods *ptm, struct lwp *l, int req, pid_t pid, 284 1.5.2.2 skrll void *addr, int data, register_t *retval) 285 1.5.2.2 skrll { 286 1.5.2.2 skrll struct proc *p = l->l_proc; 287 1.5.2.2 skrll struct lwp *lt; 288 1.5.2.2 skrll #ifdef PT_STEP 289 1.5.2.2 skrll struct lwp *lt2; 290 1.5.2.2 skrll #endif 291 1.5.2.2 skrll struct proc *t; /* target process */ 292 1.5.2.2 skrll struct uio uio; 293 1.5.2.2 skrll struct iovec iov; 294 1.5.2.2 skrll struct ptrace_io_desc piod; 295 1.5.2.2 skrll struct ptrace_event pe; 296 1.5.2.2 skrll struct ptrace_state ps; 297 1.5.2.2 skrll struct ptrace_lwpinfo pl; 298 1.5.2.2 skrll struct vmspace *vm; 299 1.5.2.2 skrll int error, write, tmp, pheld; 300 1.5.2.2 skrll int signo = 0; 301 1.5.2.2 skrll int resume_all; 302 1.5.2.2 skrll ksiginfo_t ksi; 303 1.5.2.2 skrll char *path; 304 1.5.2.2 skrll int len = 0; 305 1.5.2.2 skrll error = 0; 306 1.5.2.2 skrll 307 1.5.2.2 skrll /* 308 1.5.2.2 skrll * If attaching or detaching, we need to get a write hold on the 309 1.5.2.2 skrll * proclist lock so that we can re-parent the target process. 310 1.5.2.2 skrll */ 311 1.5.2.2 skrll mutex_enter(proc_lock); 312 1.5.2.2 skrll 313 1.5.2.2 skrll /* "A foolish consistency..." XXX */ 314 1.5.2.2 skrll if (req == PT_TRACE_ME) { 315 1.5.2.2 skrll t = p; 316 1.5.2.2 skrll mutex_enter(t->p_lock); 317 1.5.2.2 skrll } else { 318 1.5.2.2 skrll /* Find the process we're supposed to be operating on. */ 319 1.5.2.2 skrll t = proc_find(pid); 320 1.5.2.2 skrll if (t == NULL) { 321 1.5.2.2 skrll mutex_exit(proc_lock); 322 1.5.2.2 skrll return ESRCH; 323 1.5.2.2 skrll } 324 1.5.2.2 skrll 325 1.5.2.2 skrll /* XXX-elad */ 326 1.5.2.2 skrll mutex_enter(t->p_lock); 327 1.5.2.2 skrll error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_CANSEE, 328 1.5.2.2 skrll t, KAUTH_ARG(KAUTH_REQ_PROCESS_CANSEE_ENTRY), NULL, NULL); 329 1.5.2.2 skrll if (error) { 330 1.5.2.2 skrll mutex_exit(proc_lock); 331 1.5.2.2 skrll mutex_exit(t->p_lock); 332 1.5.2.2 skrll return ESRCH; 333 1.5.2.2 skrll } 334 1.5.2.2 skrll } 335 1.5.2.2 skrll 336 1.5.2.2 skrll /* 337 1.5.2.2 skrll * Grab a reference on the process to prevent it from execing or 338 1.5.2.2 skrll * exiting. 339 1.5.2.2 skrll */ 340 1.5.2.2 skrll if (!rw_tryenter(&t->p_reflock, RW_READER)) { 341 1.5.2.2 skrll mutex_exit(proc_lock); 342 1.5.2.2 skrll mutex_exit(t->p_lock); 343 1.5.2.2 skrll return EBUSY; 344 1.5.2.2 skrll } 345 1.5.2.2 skrll 346 1.5.2.2 skrll /* Make sure we can operate on it. */ 347 1.5.2.2 skrll switch (req) { 348 1.5.2.2 skrll case PT_TRACE_ME: 349 1.5.2.2 skrll /* Saying that you're being traced is always legal. */ 350 1.5.2.2 skrll break; 351 1.5.2.2 skrll 352 1.5.2.2 skrll case PT_ATTACH: 353 1.5.2.2 skrll /* 354 1.5.2.2 skrll * You can't attach to a process if: 355 1.5.2.2 skrll * (1) it's the process that's doing the attaching, 356 1.5.2.2 skrll */ 357 1.5.2.2 skrll if (t->p_pid == p->p_pid) { 358 1.5.2.2 skrll error = EINVAL; 359 1.5.2.2 skrll break; 360 1.5.2.2 skrll } 361 1.5.2.2 skrll 362 1.5.2.2 skrll /* 363 1.5.2.2 skrll * (2) it's a system process 364 1.5.2.2 skrll */ 365 1.5.2.2 skrll if (t->p_flag & PK_SYSTEM) { 366 1.5.2.2 skrll error = EPERM; 367 1.5.2.2 skrll break; 368 1.5.2.2 skrll } 369 1.5.2.2 skrll 370 1.5.2.2 skrll /* 371 1.5.2.2 skrll * (3) it's already being traced, or 372 1.5.2.2 skrll */ 373 1.5.2.2 skrll if (ISSET(t->p_slflag, PSL_TRACED)) { 374 1.5.2.2 skrll error = EBUSY; 375 1.5.2.2 skrll break; 376 1.5.2.2 skrll } 377 1.5.2.2 skrll 378 1.5.2.2 skrll /* 379 1.5.2.2 skrll * (4) the tracer is chrooted, and its root directory is 380 1.5.2.2 skrll * not at or above the root directory of the tracee 381 1.5.2.2 skrll */ 382 1.5.2.2 skrll mutex_exit(t->p_lock); /* XXXSMP */ 383 1.5.2.2 skrll tmp = proc_isunder(t, l); 384 1.5.2.2 skrll mutex_enter(t->p_lock); /* XXXSMP */ 385 1.5.2.2 skrll if (!tmp) { 386 1.5.2.2 skrll error = EPERM; 387 1.5.2.2 skrll break; 388 1.5.2.2 skrll } 389 1.5.2.2 skrll break; 390 1.5.2.2 skrll 391 1.5.2.2 skrll case PT_READ_I: 392 1.5.2.2 skrll case PT_READ_D: 393 1.5.2.2 skrll case PT_WRITE_I: 394 1.5.2.2 skrll case PT_WRITE_D: 395 1.5.2.2 skrll case PT_IO: 396 1.5.2.2 skrll #ifdef PT_GETREGS 397 1.5.2.2 skrll case PT_GETREGS: 398 1.5.2.2 skrll #endif 399 1.5.2.2 skrll #ifdef PT_SETREGS 400 1.5.2.2 skrll case PT_SETREGS: 401 1.5.2.2 skrll #endif 402 1.5.2.2 skrll #ifdef PT_GETFPREGS 403 1.5.2.2 skrll case PT_GETFPREGS: 404 1.5.2.2 skrll #endif 405 1.5.2.2 skrll #ifdef PT_SETFPREGS 406 1.5.2.2 skrll case PT_SETFPREGS: 407 1.5.2.2 skrll #endif 408 1.5.2.2 skrll #ifdef __HAVE_PTRACE_MACHDEP 409 1.5.2.2 skrll PTRACE_MACHDEP_REQUEST_CASES 410 1.5.2.2 skrll #endif 411 1.5.2.2 skrll /* 412 1.5.2.2 skrll * You can't read/write the memory or registers of a process 413 1.5.2.2 skrll * if the tracer is chrooted, and its root directory is not at 414 1.5.2.2 skrll * or above the root directory of the tracee. 415 1.5.2.2 skrll */ 416 1.5.2.2 skrll mutex_exit(t->p_lock); /* XXXSMP */ 417 1.5.2.2 skrll tmp = proc_isunder(t, l); 418 1.5.2.2 skrll mutex_enter(t->p_lock); /* XXXSMP */ 419 1.5.2.2 skrll if (!tmp) { 420 1.5.2.2 skrll error = EPERM; 421 1.5.2.2 skrll break; 422 1.5.2.2 skrll } 423 1.5.2.2 skrll /*FALLTHROUGH*/ 424 1.5.2.2 skrll 425 1.5.2.2 skrll case PT_CONTINUE: 426 1.5.2.2 skrll case PT_KILL: 427 1.5.2.2 skrll case PT_DETACH: 428 1.5.2.2 skrll case PT_LWPINFO: 429 1.5.2.2 skrll case PT_SYSCALL: 430 1.5.2.2 skrll case PT_SYSCALLEMU: 431 1.5.2.2 skrll case PT_DUMPCORE: 432 1.5.2.2 skrll #ifdef PT_STEP 433 1.5.2.2 skrll case PT_STEP: 434 1.5.2.2 skrll #endif 435 1.5.2.2 skrll case PT_SET_EVENT_MASK: 436 1.5.2.2 skrll case PT_GET_EVENT_MASK: 437 1.5.2.2 skrll case PT_GET_PROCESS_STATE: 438 1.5.2.2 skrll /* 439 1.5.2.2 skrll * You can't do what you want to the process if: 440 1.5.2.2 skrll * (1) It's not being traced at all, 441 1.5.2.2 skrll */ 442 1.5.2.2 skrll if (!ISSET(t->p_slflag, PSL_TRACED)) { 443 1.5.2.2 skrll error = EPERM; 444 1.5.2.2 skrll break; 445 1.5.2.2 skrll } 446 1.5.2.2 skrll 447 1.5.2.2 skrll /* 448 1.5.2.2 skrll * (2) it's being traced by procfs (which has 449 1.5.2.2 skrll * different signal delivery semantics), 450 1.5.2.2 skrll */ 451 1.5.2.2 skrll if (ISSET(t->p_slflag, PSL_FSTRACE)) { 452 1.5.2.2 skrll DPRINTF(("file system traced\n")); 453 1.5.2.2 skrll error = EBUSY; 454 1.5.2.2 skrll break; 455 1.5.2.2 skrll } 456 1.5.2.2 skrll 457 1.5.2.2 skrll /* 458 1.5.2.2 skrll * (3) it's not being traced by _you_, or 459 1.5.2.2 skrll */ 460 1.5.2.2 skrll if (t->p_pptr != p) { 461 1.5.2.2 skrll DPRINTF(("parent %d != %d\n", t->p_pptr->p_pid, 462 1.5.2.2 skrll p->p_pid)); 463 1.5.2.2 skrll error = EBUSY; 464 1.5.2.2 skrll break; 465 1.5.2.2 skrll } 466 1.5.2.2 skrll 467 1.5.2.2 skrll /* 468 1.5.2.2 skrll * (4) it's not currently stopped. 469 1.5.2.2 skrll */ 470 1.5.2.2 skrll if (t->p_stat != SSTOP || !t->p_waited /* XXXSMP */) { 471 1.5.2.2 skrll DPRINTF(("stat %d flag %d\n", t->p_stat, 472 1.5.2.2 skrll !t->p_waited)); 473 1.5.2.2 skrll error = EBUSY; 474 1.5.2.2 skrll break; 475 1.5.2.2 skrll } 476 1.5.2.2 skrll break; 477 1.5.2.2 skrll 478 1.5.2.2 skrll default: /* It was not a legal request. */ 479 1.5.2.2 skrll error = EINVAL; 480 1.5.2.2 skrll break; 481 1.5.2.2 skrll } 482 1.5.2.2 skrll 483 1.5.2.2 skrll if (error == 0) { 484 1.5.2.2 skrll error = kauth_authorize_process(l->l_cred, 485 1.5.2.2 skrll KAUTH_PROCESS_PTRACE, t, KAUTH_ARG(req), 486 1.5.2.2 skrll NULL, NULL); 487 1.5.2.2 skrll } 488 1.5.2.2 skrll if (error == 0) { 489 1.5.2.2 skrll lt = lwp_find_first(t); 490 1.5.2.2 skrll if (lt == NULL) 491 1.5.2.2 skrll error = ESRCH; 492 1.5.2.2 skrll } 493 1.5.2.2 skrll 494 1.5.2.2 skrll if (error != 0) { 495 1.5.2.2 skrll mutex_exit(proc_lock); 496 1.5.2.2 skrll mutex_exit(t->p_lock); 497 1.5.2.2 skrll rw_exit(&t->p_reflock); 498 1.5.2.2 skrll return error; 499 1.5.2.2 skrll } 500 1.5.2.2 skrll 501 1.5.2.2 skrll /* Do single-step fixup if needed. */ 502 1.5.2.2 skrll FIX_SSTEP(t); 503 1.5.2.2 skrll KASSERT(lt != NULL); 504 1.5.2.2 skrll lwp_addref(lt); 505 1.5.2.2 skrll 506 1.5.2.2 skrll /* 507 1.5.2.2 skrll * Which locks do we need held? XXX Ugly. 508 1.5.2.2 skrll */ 509 1.5.2.2 skrll switch (req) { 510 1.5.2.2 skrll #ifdef PT_STEP 511 1.5.2.2 skrll case PT_STEP: 512 1.5.2.2 skrll #endif 513 1.5.2.2 skrll case PT_CONTINUE: 514 1.5.2.2 skrll case PT_DETACH: 515 1.5.2.2 skrll case PT_KILL: 516 1.5.2.2 skrll case PT_SYSCALL: 517 1.5.2.2 skrll case PT_SYSCALLEMU: 518 1.5.2.2 skrll case PT_ATTACH: 519 1.5.2.2 skrll case PT_TRACE_ME: 520 1.5.2.2 skrll pheld = 1; 521 1.5.2.2 skrll break; 522 1.5.2.2 skrll default: 523 1.5.2.2 skrll mutex_exit(proc_lock); 524 1.5.2.2 skrll mutex_exit(t->p_lock); 525 1.5.2.2 skrll pheld = 0; 526 1.5.2.2 skrll break; 527 1.5.2.2 skrll } 528 1.5.2.2 skrll 529 1.5.2.2 skrll /* Now do the operation. */ 530 1.5.2.2 skrll write = 0; 531 1.5.2.2 skrll *retval = 0; 532 1.5.2.2 skrll tmp = 0; 533 1.5.2.2 skrll resume_all = 1; 534 1.5.2.2 skrll 535 1.5.2.2 skrll switch (req) { 536 1.5.2.2 skrll case PT_TRACE_ME: 537 1.5.2.2 skrll /* Just set the trace flag. */ 538 1.5.2.2 skrll SET(t->p_slflag, PSL_TRACED); 539 1.5.2.2 skrll t->p_opptr = t->p_pptr; 540 1.5.2.2 skrll break; 541 1.5.2.2 skrll 542 1.5.2.2 skrll case PT_WRITE_I: /* XXX no separate I and D spaces */ 543 1.5.2.2 skrll case PT_WRITE_D: 544 1.5.2.2 skrll #if defined(__HAVE_RAS) 545 1.5.2.2 skrll /* 546 1.5.2.2 skrll * Can't write to a RAS 547 1.5.2.2 skrll */ 548 1.5.2.2 skrll if (ras_lookup(t, addr) != (void *)-1) { 549 1.5.2.2 skrll error = EACCES; 550 1.5.2.2 skrll break; 551 1.5.2.2 skrll } 552 1.5.2.2 skrll #endif 553 1.5.2.2 skrll write = 1; 554 1.5.2.2 skrll tmp = data; 555 1.5.2.2 skrll /* FALLTHROUGH */ 556 1.5.2.2 skrll 557 1.5.2.2 skrll case PT_READ_I: /* XXX no separate I and D spaces */ 558 1.5.2.2 skrll case PT_READ_D: 559 1.5.2.2 skrll /* write = 0 done above. */ 560 1.5.2.2 skrll iov.iov_base = (void *)&tmp; 561 1.5.2.2 skrll iov.iov_len = sizeof(tmp); 562 1.5.2.2 skrll uio.uio_iov = &iov; 563 1.5.2.2 skrll uio.uio_iovcnt = 1; 564 1.5.2.2 skrll uio.uio_offset = (off_t)(unsigned long)addr; 565 1.5.2.2 skrll uio.uio_resid = sizeof(tmp); 566 1.5.2.2 skrll uio.uio_rw = write ? UIO_WRITE : UIO_READ; 567 1.5.2.2 skrll UIO_SETUP_SYSSPACE(&uio); 568 1.5.2.2 skrll 569 1.5.2.2 skrll error = process_domem(l, lt, &uio); 570 1.5.2.2 skrll if (!write) 571 1.5.2.2 skrll *retval = tmp; 572 1.5.2.2 skrll break; 573 1.5.2.2 skrll 574 1.5.2.2 skrll case PT_IO: 575 1.5.2.2 skrll error = ptm->ptm_copyinpiod(&piod, addr); 576 1.5.2.2 skrll if (error) 577 1.5.2.2 skrll break; 578 1.5.2.2 skrll 579 1.5.2.2 skrll iov.iov_base = piod.piod_addr; 580 1.5.2.2 skrll iov.iov_len = piod.piod_len; 581 1.5.2.2 skrll uio.uio_iov = &iov; 582 1.5.2.2 skrll uio.uio_iovcnt = 1; 583 1.5.2.2 skrll uio.uio_offset = (off_t)(unsigned long)piod.piod_offs; 584 1.5.2.2 skrll uio.uio_resid = piod.piod_len; 585 1.5.2.2 skrll 586 1.5.2.2 skrll switch (piod.piod_op) { 587 1.5.2.2 skrll case PIOD_READ_D: 588 1.5.2.2 skrll case PIOD_READ_I: 589 1.5.2.2 skrll uio.uio_rw = UIO_READ; 590 1.5.2.2 skrll break; 591 1.5.2.2 skrll case PIOD_WRITE_D: 592 1.5.2.2 skrll case PIOD_WRITE_I: 593 1.5.2.2 skrll /* 594 1.5.2.2 skrll * Can't write to a RAS 595 1.5.2.2 skrll */ 596 1.5.2.2 skrll if (ras_lookup(t, addr) != (void *)-1) { 597 1.5.2.2 skrll return EACCES; 598 1.5.2.2 skrll } 599 1.5.2.2 skrll uio.uio_rw = UIO_WRITE; 600 1.5.2.2 skrll break; 601 1.5.2.2 skrll case PIOD_READ_AUXV: 602 1.5.2.2 skrll req = PT_READ_D; 603 1.5.2.2 skrll uio.uio_rw = UIO_READ; 604 1.5.2.2 skrll tmp = t->p_execsw->es_arglen * PROC_PTRSZ(t); 605 1.5.2.2 skrll if (uio.uio_offset > tmp) 606 1.5.2.2 skrll return EIO; 607 1.5.2.2 skrll if (uio.uio_resid > tmp - uio.uio_offset) 608 1.5.2.2 skrll uio.uio_resid = tmp - uio.uio_offset; 609 1.5.2.2 skrll piod.piod_len = iov.iov_len = uio.uio_resid; 610 1.5.2.2 skrll error = process_auxv_offset(t, &uio); 611 1.5.2.2 skrll if (error) 612 1.5.2.2 skrll return error; 613 1.5.2.2 skrll break; 614 1.5.2.2 skrll default: 615 1.5.2.2 skrll error = EINVAL; 616 1.5.2.2 skrll break; 617 1.5.2.2 skrll } 618 1.5.2.2 skrll if (error) 619 1.5.2.2 skrll break; 620 1.5.2.2 skrll error = proc_vmspace_getref(l->l_proc, &vm); 621 1.5.2.2 skrll if (error) 622 1.5.2.2 skrll break; 623 1.5.2.2 skrll uio.uio_vmspace = vm; 624 1.5.2.2 skrll 625 1.5.2.2 skrll error = process_domem(l, lt, &uio); 626 1.5.2.2 skrll piod.piod_len -= uio.uio_resid; 627 1.5.2.2 skrll (void) ptm->ptm_copyoutpiod(&piod, addr); 628 1.5.2.2 skrll 629 1.5.2.2 skrll uvmspace_free(vm); 630 1.5.2.2 skrll break; 631 1.5.2.2 skrll 632 1.5.2.2 skrll case PT_DUMPCORE: 633 1.5.2.2 skrll if ((path = addr) != NULL) { 634 1.5.2.2 skrll char *dst; 635 1.5.2.2 skrll len = data; 636 1.5.2.2 skrll 637 1.5.2.2 skrll if (len < 0 || len >= MAXPATHLEN) { 638 1.5.2.2 skrll error = EINVAL; 639 1.5.2.2 skrll break; 640 1.5.2.2 skrll } 641 1.5.2.2 skrll dst = kmem_alloc(len + 1, KM_SLEEP); 642 1.5.2.2 skrll if ((error = copyin(path, dst, len)) != 0) { 643 1.5.2.2 skrll kmem_free(dst, len + 1); 644 1.5.2.2 skrll break; 645 1.5.2.2 skrll } 646 1.5.2.2 skrll path = dst; 647 1.5.2.2 skrll path[len] = '\0'; 648 1.5.2.2 skrll } 649 1.5.2.2 skrll error = (*coredump_vec)(lt, path); 650 1.5.2.2 skrll if (path) 651 1.5.2.2 skrll kmem_free(path, len + 1); 652 1.5.2.2 skrll break; 653 1.5.2.2 skrll 654 1.5.2.2 skrll #ifdef PT_STEP 655 1.5.2.2 skrll case PT_STEP: 656 1.5.2.2 skrll /* 657 1.5.2.2 skrll * From the 4.4BSD PRM: 658 1.5.2.2 skrll * "Execution continues as in request PT_CONTINUE; however 659 1.5.2.2 skrll * as soon as possible after execution of at least one 660 1.5.2.2 skrll * instruction, execution stops again. [ ... ]" 661 1.5.2.2 skrll */ 662 1.5.2.2 skrll #endif 663 1.5.2.2 skrll case PT_CONTINUE: 664 1.5.2.2 skrll case PT_SYSCALL: 665 1.5.2.2 skrll case PT_DETACH: 666 1.5.2.2 skrll if (req == PT_SYSCALL) { 667 1.5.2.2 skrll if (!ISSET(t->p_slflag, PSL_SYSCALL)) { 668 1.5.2.2 skrll SET(t->p_slflag, PSL_SYSCALL); 669 1.5.2.2 skrll #ifdef __HAVE_SYSCALL_INTERN 670 1.5.2.2 skrll (*t->p_emul->e_syscall_intern)(t); 671 1.5.2.2 skrll #endif 672 1.5.2.2 skrll } 673 1.5.2.2 skrll } else { 674 1.5.2.2 skrll if (ISSET(t->p_slflag, PSL_SYSCALL)) { 675 1.5.2.2 skrll CLR(t->p_slflag, PSL_SYSCALL); 676 1.5.2.2 skrll #ifdef __HAVE_SYSCALL_INTERN 677 1.5.2.2 skrll (*t->p_emul->e_syscall_intern)(t); 678 1.5.2.2 skrll #endif 679 1.5.2.2 skrll } 680 1.5.2.2 skrll } 681 1.5.2.2 skrll t->p_trace_enabled = trace_is_enabled(t); 682 1.5.2.2 skrll 683 1.5.2.2 skrll /* 684 1.5.2.2 skrll * Pick up the LWPID, if supplied. There are two cases: 685 1.5.2.2 skrll * data < 0 : step or continue single thread, lwp = -data 686 1.5.2.2 skrll * data > 0 in PT_STEP : step this thread, continue others 687 1.5.2.2 skrll * For operations other than PT_STEP, data > 0 means 688 1.5.2.2 skrll * data is the signo to deliver to the process. 689 1.5.2.2 skrll */ 690 1.5.2.2 skrll tmp = data; 691 1.5.2.2 skrll if (tmp >= 0) { 692 1.5.2.2 skrll #ifdef PT_STEP 693 1.5.2.2 skrll if (req == PT_STEP) 694 1.5.2.2 skrll signo = 0; 695 1.5.2.2 skrll else 696 1.5.2.2 skrll #endif 697 1.5.2.2 skrll { 698 1.5.2.2 skrll signo = tmp; 699 1.5.2.2 skrll tmp = 0; /* don't search for LWP */ 700 1.5.2.2 skrll } 701 1.5.2.2 skrll } else 702 1.5.2.2 skrll tmp = -tmp; 703 1.5.2.2 skrll 704 1.5.2.2 skrll if (tmp > 0) { 705 1.5.2.2 skrll if (req == PT_DETACH) { 706 1.5.2.2 skrll error = EINVAL; 707 1.5.2.2 skrll break; 708 1.5.2.2 skrll } 709 1.5.2.2 skrll lwp_delref2 (lt); 710 1.5.2.2 skrll lt = lwp_find(t, tmp); 711 1.5.2.2 skrll if (lt == NULL) { 712 1.5.2.2 skrll error = ESRCH; 713 1.5.2.2 skrll break; 714 1.5.2.2 skrll } 715 1.5.2.2 skrll lwp_addref(lt); 716 1.5.2.2 skrll resume_all = 0; 717 1.5.2.2 skrll signo = 0; 718 1.5.2.2 skrll } 719 1.5.2.2 skrll 720 1.5.2.2 skrll /* 721 1.5.2.2 skrll * From the 4.4BSD PRM: 722 1.5.2.2 skrll * "The data argument is taken as a signal number and the 723 1.5.2.2 skrll * child's execution continues at location addr as if it 724 1.5.2.2 skrll * incurred that signal. Normally the signal number will 725 1.5.2.2 skrll * be either 0 to indicate that the signal that caused the 726 1.5.2.2 skrll * stop should be ignored, or that value fetched out of 727 1.5.2.2 skrll * the process's image indicating which signal caused 728 1.5.2.2 skrll * the stop. If addr is (int *)1 then execution continues 729 1.5.2.2 skrll * from where it stopped." 730 1.5.2.2 skrll */ 731 1.5.2.2 skrll 732 1.5.2.2 skrll /* Check that the data is a valid signal number or zero. */ 733 1.5.2.2 skrll if (signo < 0 || signo >= NSIG) { 734 1.5.2.2 skrll error = EINVAL; 735 1.5.2.2 skrll break; 736 1.5.2.2 skrll } 737 1.5.2.2 skrll 738 1.5.2.2 skrll /* If the address parameter is not (int *)1, set the pc. */ 739 1.5.2.2 skrll if ((int *)addr != (int *)1) { 740 1.5.2.2 skrll error = process_set_pc(lt, addr); 741 1.5.2.2 skrll if (error != 0) 742 1.5.2.2 skrll break; 743 1.5.2.2 skrll } 744 1.5.2.2 skrll #ifdef PT_STEP 745 1.5.2.2 skrll /* 746 1.5.2.2 skrll * Arrange for a single-step, if that's requested and possible. 747 1.5.2.2 skrll * More precisely, set the single step status as requested for 748 1.5.2.2 skrll * the requested thread, and clear it for other threads. 749 1.5.2.2 skrll */ 750 1.5.2.2 skrll LIST_FOREACH(lt2, &t->p_lwps, l_sibling) { 751 1.5.2.2 skrll if (lt != lt2) { 752 1.5.2.2 skrll lwp_lock(lt2); 753 1.5.2.2 skrll process_sstep(lt2, 0); 754 1.5.2.2 skrll lwp_unlock(lt2); 755 1.5.2.2 skrll } 756 1.5.2.2 skrll } 757 1.5.2.2 skrll error = process_sstep(lt, req == PT_STEP); 758 1.5.2.2 skrll if (error) 759 1.5.2.2 skrll break; 760 1.5.2.2 skrll #endif 761 1.5.2.2 skrll if (req == PT_DETACH) { 762 1.5.2.2 skrll CLR(t->p_slflag, PSL_TRACED|PSL_FSTRACE|PSL_SYSCALL); 763 1.5.2.2 skrll 764 1.5.2.2 skrll /* give process back to original parent or init */ 765 1.5.2.2 skrll if (t->p_opptr != t->p_pptr) { 766 1.5.2.2 skrll struct proc *pp = t->p_opptr; 767 1.5.2.2 skrll proc_reparent(t, pp ? pp : initproc); 768 1.5.2.2 skrll } 769 1.5.2.2 skrll 770 1.5.2.2 skrll /* not being traced any more */ 771 1.5.2.2 skrll t->p_opptr = NULL; 772 1.5.2.2 skrll } 773 1.5.2.2 skrll sendsig: 774 1.5.2.2 skrll t->p_fpid = 0; 775 1.5.2.2 skrll /* Finally, deliver the requested signal (or none). */ 776 1.5.2.2 skrll if (t->p_stat == SSTOP) { 777 1.5.2.2 skrll /* 778 1.5.2.2 skrll * Unstop the process. If it needs to take a 779 1.5.2.2 skrll * signal, make all efforts to ensure that at 780 1.5.2.2 skrll * an LWP runs to see it. 781 1.5.2.2 skrll */ 782 1.5.2.2 skrll t->p_xsig = signo; 783 1.5.2.2 skrll if (resume_all) 784 1.5.2.2 skrll proc_unstop(t); 785 1.5.2.2 skrll else 786 1.5.2.2 skrll lwp_unstop(lt); 787 1.5.2.2 skrll } else if (signo != 0) { 788 1.5.2.2 skrll KSI_INIT_EMPTY(&ksi); 789 1.5.2.2 skrll ksi.ksi_signo = signo; 790 1.5.2.2 skrll kpsignal2(t, &ksi); 791 1.5.2.2 skrll } 792 1.5.2.2 skrll break; 793 1.5.2.2 skrll 794 1.5.2.2 skrll case PT_SYSCALLEMU: 795 1.5.2.2 skrll if (!ISSET(t->p_slflag, PSL_SYSCALL) || t->p_stat != SSTOP) { 796 1.5.2.2 skrll error = EINVAL; 797 1.5.2.2 skrll break; 798 1.5.2.2 skrll } 799 1.5.2.2 skrll SET(t->p_slflag, PSL_SYSCALLEMU); 800 1.5.2.2 skrll break; 801 1.5.2.2 skrll 802 1.5.2.2 skrll case PT_KILL: 803 1.5.2.2 skrll /* just send the process a KILL signal. */ 804 1.5.2.2 skrll signo = SIGKILL; 805 1.5.2.2 skrll goto sendsig; /* in PT_CONTINUE, above. */ 806 1.5.2.2 skrll 807 1.5.2.2 skrll case PT_ATTACH: 808 1.5.2.2 skrll /* 809 1.5.2.2 skrll * Go ahead and set the trace flag. 810 1.5.2.2 skrll * Save the old parent (it's reset in 811 1.5.2.2 skrll * _DETACH, and also in kern_exit.c:wait4() 812 1.5.2.2 skrll * Reparent the process so that the tracing 813 1.5.2.2 skrll * proc gets to see all the action. 814 1.5.2.2 skrll * Stop the target. 815 1.5.2.2 skrll */ 816 1.5.2.2 skrll proc_changeparent(t, p); 817 1.5.2.2 skrll signo = SIGSTOP; 818 1.5.2.2 skrll goto sendsig; 819 1.5.2.2 skrll 820 1.5.2.2 skrll case PT_GET_EVENT_MASK: 821 1.5.2.2 skrll if (data != sizeof(pe)) { 822 1.5.2.2 skrll DPRINTF(("ptrace(%d): %d != %zu\n", req, 823 1.5.2.2 skrll data, sizeof(pe))); 824 1.5.2.2 skrll error = EINVAL; 825 1.5.2.2 skrll break; 826 1.5.2.2 skrll } 827 1.5.2.2 skrll memset(&pe, 0, sizeof(pe)); 828 1.5.2.2 skrll pe.pe_set_event = ISSET(t->p_slflag, PSL_TRACEFORK) ? 829 1.5.2.2 skrll PTRACE_FORK : 0; 830 1.5.2.2 skrll error = copyout(&pe, addr, sizeof(pe)); 831 1.5.2.2 skrll break; 832 1.5.2.2 skrll 833 1.5.2.2 skrll case PT_SET_EVENT_MASK: 834 1.5.2.2 skrll if (data != sizeof(pe)) { 835 1.5.2.2 skrll DPRINTF(("ptrace(%d): %d != %zu\n", req, data, 836 1.5.2.2 skrll sizeof(pe))); 837 1.5.2.2 skrll error = EINVAL; 838 1.5.2.2 skrll break; 839 1.5.2.2 skrll } 840 1.5.2.2 skrll if ((error = copyin(addr, &pe, sizeof(pe))) != 0) 841 1.5.2.2 skrll return error; 842 1.5.2.2 skrll if (pe.pe_set_event & PTRACE_FORK) 843 1.5.2.2 skrll SET(t->p_slflag, PSL_TRACEFORK); 844 1.5.2.2 skrll else 845 1.5.2.2 skrll CLR(t->p_slflag, PSL_TRACEFORK); 846 1.5.2.2 skrll break; 847 1.5.2.2 skrll 848 1.5.2.2 skrll case PT_GET_PROCESS_STATE: 849 1.5.2.2 skrll if (data != sizeof(ps)) { 850 1.5.2.2 skrll DPRINTF(("ptrace(%d): %d != %zu\n", req, data, 851 1.5.2.2 skrll sizeof(ps))); 852 1.5.2.2 skrll error = EINVAL; 853 1.5.2.2 skrll break; 854 1.5.2.2 skrll } 855 1.5.2.2 skrll memset(&ps, 0, sizeof(ps)); 856 1.5.2.2 skrll if (t->p_fpid) { 857 1.5.2.2 skrll ps.pe_report_event = PTRACE_FORK; 858 1.5.2.2 skrll ps.pe_other_pid = t->p_fpid; 859 1.5.2.2 skrll } 860 1.5.2.2 skrll error = copyout(&ps, addr, sizeof(ps)); 861 1.5.2.2 skrll break; 862 1.5.2.2 skrll 863 1.5.2.2 skrll case PT_LWPINFO: 864 1.5.2.2 skrll if (data != sizeof(pl)) { 865 1.5.2.2 skrll DPRINTF(("ptrace(%d): %d != %zu\n", req, data, 866 1.5.2.2 skrll sizeof(pl))); 867 1.5.2.2 skrll error = EINVAL; 868 1.5.2.2 skrll break; 869 1.5.2.2 skrll } 870 1.5.2.2 skrll error = copyin(addr, &pl, sizeof(pl)); 871 1.5.2.2 skrll if (error) 872 1.5.2.2 skrll break; 873 1.5.2.2 skrll tmp = pl.pl_lwpid; 874 1.5.2.2 skrll lwp_delref(lt); 875 1.5.2.2 skrll mutex_enter(t->p_lock); 876 1.5.2.2 skrll if (tmp == 0) 877 1.5.2.2 skrll lt = lwp_find_first(t); 878 1.5.2.2 skrll else { 879 1.5.2.2 skrll lt = lwp_find(t, tmp); 880 1.5.2.2 skrll if (lt == NULL) { 881 1.5.2.2 skrll mutex_exit(t->p_lock); 882 1.5.2.2 skrll error = ESRCH; 883 1.5.2.2 skrll break; 884 1.5.2.2 skrll } 885 1.5.2.2 skrll lt = LIST_NEXT(lt, l_sibling); 886 1.5.2.2 skrll } 887 1.5.2.2 skrll while (lt != NULL && !lwp_alive(lt)) 888 1.5.2.2 skrll lt = LIST_NEXT(lt, l_sibling); 889 1.5.2.2 skrll pl.pl_lwpid = 0; 890 1.5.2.2 skrll pl.pl_event = 0; 891 1.5.2.2 skrll if (lt) { 892 1.5.2.2 skrll lwp_addref(lt); 893 1.5.2.2 skrll pl.pl_lwpid = lt->l_lid; 894 1.5.2.2 skrll if (lt->l_lid == t->p_sigctx.ps_lwp) 895 1.5.2.2 skrll pl.pl_event = PL_EVENT_SIGNAL; 896 1.5.2.2 skrll } 897 1.5.2.2 skrll mutex_exit(t->p_lock); 898 1.5.2.2 skrll 899 1.5.2.2 skrll error = copyout(&pl, addr, sizeof(pl)); 900 1.5.2.2 skrll break; 901 1.5.2.2 skrll 902 1.5.2.2 skrll #ifdef PT_SETREGS 903 1.5.2.2 skrll case PT_SETREGS: 904 1.5.2.2 skrll write = 1; 905 1.5.2.2 skrll #endif 906 1.5.2.2 skrll #ifdef PT_GETREGS 907 1.5.2.2 skrll case PT_GETREGS: 908 1.5.2.2 skrll /* write = 0 done above. */ 909 1.5.2.2 skrll #endif 910 1.5.2.2 skrll #if defined(PT_SETREGS) || defined(PT_GETREGS) 911 1.5.2.2 skrll tmp = data; 912 1.5.2.2 skrll if (tmp != 0 && t->p_nlwps > 1) { 913 1.5.2.2 skrll lwp_delref(lt); 914 1.5.2.2 skrll mutex_enter(t->p_lock); 915 1.5.2.2 skrll lt = lwp_find(t, tmp); 916 1.5.2.2 skrll if (lt == NULL) { 917 1.5.2.2 skrll mutex_exit(t->p_lock); 918 1.5.2.2 skrll error = ESRCH; 919 1.5.2.2 skrll break; 920 1.5.2.2 skrll } 921 1.5.2.2 skrll lwp_addref(lt); 922 1.5.2.2 skrll mutex_exit(t->p_lock); 923 1.5.2.2 skrll } 924 1.5.2.2 skrll if (!process_validregs(lt)) 925 1.5.2.2 skrll error = EINVAL; 926 1.5.2.2 skrll else { 927 1.5.2.2 skrll error = proc_vmspace_getref(p, &vm); 928 1.5.2.2 skrll if (error) 929 1.5.2.2 skrll break; 930 1.5.2.2 skrll iov.iov_base = addr; 931 1.5.2.2 skrll iov.iov_len = PROC_REGSZ(p); 932 1.5.2.2 skrll uio.uio_iov = &iov; 933 1.5.2.2 skrll uio.uio_iovcnt = 1; 934 1.5.2.2 skrll uio.uio_offset = 0; 935 1.5.2.2 skrll uio.uio_resid = iov.iov_len; 936 1.5.2.2 skrll uio.uio_rw = write ? UIO_WRITE : UIO_READ; 937 1.5.2.2 skrll uio.uio_vmspace = vm; 938 1.5.2.2 skrll 939 1.5.2.2 skrll error = ptm->ptm_doregs(l, lt, &uio); 940 1.5.2.2 skrll uvmspace_free(vm); 941 1.5.2.2 skrll } 942 1.5.2.2 skrll break; 943 1.5.2.2 skrll #endif 944 1.5.2.2 skrll 945 1.5.2.2 skrll #ifdef PT_SETFPREGS 946 1.5.2.2 skrll case PT_SETFPREGS: 947 1.5.2.2 skrll write = 1; 948 1.5.2.2 skrll /*FALLTHROUGH*/ 949 1.5.2.2 skrll #endif 950 1.5.2.2 skrll #ifdef PT_GETFPREGS 951 1.5.2.2 skrll case PT_GETFPREGS: 952 1.5.2.2 skrll /* write = 0 done above. */ 953 1.5.2.2 skrll #endif 954 1.5.2.2 skrll #if defined(PT_SETFPREGS) || defined(PT_GETFPREGS) 955 1.5.2.2 skrll tmp = data; 956 1.5.2.2 skrll if (tmp != 0 && t->p_nlwps > 1) { 957 1.5.2.2 skrll lwp_delref(lt); 958 1.5.2.2 skrll mutex_enter(t->p_lock); 959 1.5.2.2 skrll lt = lwp_find(t, tmp); 960 1.5.2.2 skrll if (lt == NULL) { 961 1.5.2.2 skrll mutex_exit(t->p_lock); 962 1.5.2.2 skrll error = ESRCH; 963 1.5.2.2 skrll break; 964 1.5.2.2 skrll } 965 1.5.2.2 skrll lwp_addref(lt); 966 1.5.2.2 skrll mutex_exit(t->p_lock); 967 1.5.2.2 skrll } 968 1.5.2.2 skrll if (!process_validfpregs(lt)) 969 1.5.2.2 skrll error = EINVAL; 970 1.5.2.2 skrll else { 971 1.5.2.2 skrll error = proc_vmspace_getref(p, &vm); 972 1.5.2.2 skrll if (error) 973 1.5.2.2 skrll break; 974 1.5.2.2 skrll iov.iov_base = addr; 975 1.5.2.2 skrll iov.iov_len = PROC_FPREGSZ(p); 976 1.5.2.2 skrll uio.uio_iov = &iov; 977 1.5.2.2 skrll uio.uio_iovcnt = 1; 978 1.5.2.2 skrll uio.uio_offset = 0; 979 1.5.2.2 skrll uio.uio_resid = iov.iov_len; 980 1.5.2.2 skrll uio.uio_rw = write ? UIO_WRITE : UIO_READ; 981 1.5.2.2 skrll uio.uio_vmspace = vm; 982 1.5.2.2 skrll 983 1.5.2.2 skrll error = ptm->ptm_dofpregs(l, lt, &uio); 984 1.5.2.2 skrll uvmspace_free(vm); 985 1.5.2.2 skrll } 986 1.5.2.2 skrll break; 987 1.5.2.2 skrll #endif 988 1.5.2.2 skrll 989 1.5.2.2 skrll #ifdef __HAVE_PTRACE_MACHDEP 990 1.5.2.2 skrll PTRACE_MACHDEP_REQUEST_CASES 991 1.5.2.2 skrll error = ptrace_machdep_dorequest(l, lt, req, addr, data); 992 1.5.2.2 skrll break; 993 1.5.2.2 skrll #endif 994 1.5.2.2 skrll } 995 1.5.2.2 skrll 996 1.5.2.2 skrll if (pheld) { 997 1.5.2.2 skrll mutex_exit(t->p_lock); 998 1.5.2.2 skrll mutex_exit(proc_lock); 999 1.5.2.2 skrll } 1000 1.5.2.2 skrll if (lt != NULL) 1001 1.5.2.2 skrll lwp_delref(lt); 1002 1.5.2.2 skrll rw_exit(&t->p_reflock); 1003 1.5.2.2 skrll 1004 1.5.2.2 skrll return error; 1005 1.5.2.2 skrll } 1006 1.5.2.2 skrll 1007 1.5.2.2 skrll int 1008 1.5.2.2 skrll process_doregs(struct lwp *curl /*tracer*/, 1009 1.5.2.2 skrll struct lwp *l /*traced*/, 1010 1.5.2.2 skrll struct uio *uio) 1011 1.5.2.2 skrll { 1012 1.5.2.2 skrll #if defined(PT_GETREGS) || defined(PT_SETREGS) 1013 1.5.2.2 skrll int error; 1014 1.5.2.2 skrll struct reg r; 1015 1.5.2.2 skrll char *kv; 1016 1.5.2.2 skrll int kl; 1017 1.5.2.2 skrll 1018 1.5.2.2 skrll if (uio->uio_offset < 0 || uio->uio_offset > (off_t)sizeof(r)) 1019 1.5.2.2 skrll return EINVAL; 1020 1.5.2.2 skrll 1021 1.5.2.2 skrll kl = sizeof(r); 1022 1.5.2.2 skrll kv = (char *)&r; 1023 1.5.2.2 skrll 1024 1.5.2.2 skrll kv += uio->uio_offset; 1025 1.5.2.2 skrll kl -= uio->uio_offset; 1026 1.5.2.2 skrll if ((size_t)kl > uio->uio_resid) 1027 1.5.2.2 skrll kl = uio->uio_resid; 1028 1.5.2.2 skrll 1029 1.5.2.2 skrll error = process_read_regs(l, &r); 1030 1.5.2.2 skrll if (error == 0) 1031 1.5.2.2 skrll error = uiomove(kv, kl, uio); 1032 1.5.2.2 skrll if (error == 0 && uio->uio_rw == UIO_WRITE) { 1033 1.5.2.2 skrll if (l->l_stat != LSSTOP) 1034 1.5.2.2 skrll error = EBUSY; 1035 1.5.2.2 skrll else 1036 1.5.2.2 skrll error = process_write_regs(l, &r); 1037 1.5.2.2 skrll } 1038 1.5.2.2 skrll 1039 1.5.2.2 skrll uio->uio_offset = 0; 1040 1.5.2.2 skrll return error; 1041 1.5.2.2 skrll #else 1042 1.5.2.2 skrll return EINVAL; 1043 1.5.2.2 skrll #endif 1044 1.5.2.2 skrll } 1045 1.5.2.2 skrll 1046 1.5.2.2 skrll int 1047 1.5.2.2 skrll process_validregs(struct lwp *l) 1048 1.5.2.2 skrll { 1049 1.5.2.2 skrll 1050 1.5.2.2 skrll #if defined(PT_SETREGS) || defined(PT_GETREGS) 1051 1.5.2.2 skrll return (l->l_flag & LW_SYSTEM) == 0; 1052 1.5.2.2 skrll #else 1053 1.5.2.2 skrll return 0; 1054 1.5.2.2 skrll #endif 1055 1.5.2.2 skrll } 1056 1.5.2.2 skrll 1057 1.5.2.2 skrll int 1058 1.5.2.2 skrll process_dofpregs(struct lwp *curl /*tracer*/, 1059 1.5.2.2 skrll struct lwp *l /*traced*/, 1060 1.5.2.2 skrll struct uio *uio) 1061 1.5.2.2 skrll { 1062 1.5.2.2 skrll #if defined(PT_GETFPREGS) || defined(PT_SETFPREGS) 1063 1.5.2.2 skrll int error; 1064 1.5.2.2 skrll struct fpreg r; 1065 1.5.2.2 skrll char *kv; 1066 1.5.2.2 skrll size_t kl; 1067 1.5.2.2 skrll 1068 1.5.2.2 skrll if (uio->uio_offset < 0 || uio->uio_offset > (off_t)sizeof(r)) 1069 1.5.2.2 skrll return EINVAL; 1070 1.5.2.2 skrll 1071 1.5.2.2 skrll kl = sizeof(r); 1072 1.5.2.2 skrll kv = (char *)&r; 1073 1.5.2.2 skrll 1074 1.5.2.2 skrll kv += uio->uio_offset; 1075 1.5.2.2 skrll kl -= uio->uio_offset; 1076 1.5.2.2 skrll if (kl > uio->uio_resid) 1077 1.5.2.2 skrll kl = uio->uio_resid; 1078 1.5.2.2 skrll 1079 1.5.2.2 skrll error = process_read_fpregs(l, &r, &kl); 1080 1.5.2.2 skrll if (error == 0) 1081 1.5.2.2 skrll error = uiomove(kv, kl, uio); 1082 1.5.2.2 skrll if (error == 0 && uio->uio_rw == UIO_WRITE) { 1083 1.5.2.2 skrll if (l->l_stat != LSSTOP) 1084 1.5.2.2 skrll error = EBUSY; 1085 1.5.2.2 skrll else 1086 1.5.2.2 skrll error = process_write_fpregs(l, &r, kl); 1087 1.5.2.2 skrll } 1088 1.5.2.2 skrll uio->uio_offset = 0; 1089 1.5.2.2 skrll return error; 1090 1.5.2.2 skrll #else 1091 1.5.2.2 skrll return EINVAL; 1092 1.5.2.2 skrll #endif 1093 1.5.2.2 skrll } 1094 1.5.2.2 skrll 1095 1.5.2.2 skrll int 1096 1.5.2.2 skrll process_validfpregs(struct lwp *l) 1097 1.5.2.2 skrll { 1098 1.5.2.2 skrll 1099 1.5.2.2 skrll #if defined(PT_SETFPREGS) || defined(PT_GETFPREGS) 1100 1.5.2.2 skrll return (l->l_flag & LW_SYSTEM) == 0; 1101 1.5.2.2 skrll #else 1102 1.5.2.2 skrll return 0; 1103 1.5.2.2 skrll #endif 1104 1.5.2.2 skrll } 1105 1.5.2.2 skrll 1106 1.5.2.2 skrll static int 1107 1.5.2.2 skrll process_auxv_offset(struct proc *p, struct uio *uio) 1108 1.5.2.2 skrll { 1109 1.5.2.2 skrll struct ps_strings pss; 1110 1.5.2.2 skrll int error; 1111 1.5.2.2 skrll off_t off = (off_t)p->p_psstrp; 1112 1.5.2.2 skrll 1113 1.5.2.2 skrll if ((error = copyin_psstrings(p, &pss)) != 0) 1114 1.5.2.2 skrll return error; 1115 1.5.2.2 skrll 1116 1.5.2.2 skrll if (pss.ps_envstr == NULL) 1117 1.5.2.2 skrll return EIO; 1118 1.5.2.2 skrll 1119 1.5.2.2 skrll uio->uio_offset += (off_t)(vaddr_t)(pss.ps_envstr + pss.ps_nenvstr + 1); 1120 1.5.2.2 skrll #ifdef __MACHINE_STACK_GROWS_UP 1121 1.5.2.2 skrll if (uio->uio_offset < off) 1122 1.5.2.2 skrll return EIO; 1123 1.5.2.2 skrll #else 1124 1.5.2.2 skrll if (uio->uio_offset > off) 1125 1.5.2.2 skrll return EIO; 1126 1.5.2.2 skrll if ((uio->uio_offset + uio->uio_resid) > off) 1127 1.5.2.2 skrll uio->uio_resid = off - uio->uio_offset; 1128 1.5.2.2 skrll #endif 1129 1.5.2.2 skrll return 0; 1130 1.5.2.2 skrll } 1131 1.5.2.2 skrll #endif /* PTRACE */ 1132 1.5.2.2 skrll 1133 1.5.2.2 skrll MODULE(MODULE_CLASS_EXEC, ptrace_common, ""); 1134 1.5.2.2 skrll 1135 1.5.2.2 skrll static int 1136 1.5.2.2 skrll ptrace_common_modcmd(modcmd_t cmd, void *arg) 1137 1.5.2.2 skrll { 1138 1.5.2.2 skrll int error; 1139 1.5.2.2 skrll 1140 1.5.2.2 skrll switch (cmd) { 1141 1.5.2.2 skrll case MODULE_CMD_INIT: 1142 1.5.2.2 skrll error = ptrace_init(); 1143 1.5.2.2 skrll break; 1144 1.5.2.2 skrll case MODULE_CMD_FINI: 1145 1.5.2.2 skrll error = ptrace_fini(); 1146 1.5.2.2 skrll break; 1147 1.5.2.2 skrll default: 1148 1.5.2.2 skrll ptrace_hooks(); 1149 1.5.2.2 skrll error = ENOTTY; 1150 1.5.2.2 skrll break; 1151 1.5.2.2 skrll } 1152 1.5.2.2 skrll return error; 1153 1.5.2.2 skrll } 1154 1.5.2.2 skrll 1155
Indexes created Tue Sep 30 20:09:53 GMT 2025