1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/types.h> 30 #include <sys/uio.h> 31 #include <sys/param.h> 32 #include <sys/cmn_err.h> 33 #include <sys/cred.h> 34 #include <sys/policy.h> 35 #include <sys/debug.h> 36 #include <sys/errno.h> 37 #include <sys/file.h> 38 #include <sys/inline.h> 39 #include <sys/kmem.h> 40 #include <sys/proc.h> 41 #include <sys/regset.h> 42 #include <sys/sysmacros.h> 43 #include <sys/systm.h> 44 #include <sys/vfs.h> 45 #include <sys/vnode.h> 46 #include <sys/signal.h> 47 #include <sys/auxv.h> 48 #include <sys/user.h> 49 #include <sys/class.h> 50 #include <sys/fault.h> 51 #include <sys/syscall.h> 52 #include <sys/procfs.h> 53 #include <sys/zone.h> 54 #include <sys/copyops.h> 55 #include <sys/schedctl.h> 56 #include <vm/as.h> 57 #include <vm/seg.h> 58 #include <fs/proc/prdata.h> 59 #include <sys/contract/process_impl.h> 60 61 static void pr_settrace(proc_t *, sigset_t *); 62 static int pr_setfpregs(prnode_t *, prfpregset_t *); 63 #if defined(__sparc) 64 static int pr_setxregs(prnode_t *, prxregset_t *); 65 static int pr_setasrs(prnode_t *, asrset_t); 66 #endif 67 static int pr_setvaddr(prnode_t *, caddr_t); 68 static int pr_clearsig(prnode_t *); 69 static int pr_clearflt(prnode_t *); 70 static int pr_watch(prnode_t *, prwatch_t *, int *); 71 static int pr_agent(prnode_t *, prgregset_t, int *); 72 static int pr_rdwr(proc_t *, enum uio_rw, priovec_t *); 73 static int pr_scred(proc_t *, prcred_t *, cred_t *, boolean_t); 74 static int pr_spriv(proc_t *, prpriv_t *, cred_t *); 75 static int pr_szoneid(proc_t *, zoneid_t, cred_t *); 76 static void pauselwps(proc_t *); 77 static void unpauselwps(proc_t *); 78 79 typedef union { 80 long sig; /* PCKILL, PCUNKILL */ 81 long nice; /* PCNICE */ 82 long timeo; /* PCTWSTOP */ 83 ulong_t flags; /* PCRUN, PCSET, PCUNSET */ 84 caddr_t vaddr; /* PCSVADDR */ 85 siginfo_t siginfo; /* PCSSIG */ 86 sigset_t sigset; /* PCSTRACE, PCSHOLD */ 87 fltset_t fltset; /* PCSFAULT */ 88 sysset_t sysset; /* PCSENTRY, PCSEXIT */ 89 prgregset_t prgregset; /* PCSREG, PCAGENT */ 90 prfpregset_t prfpregset; /* PCSFPREG */ 91 #if defined(__sparc) 92 prxregset_t prxregset; /* PCSXREG */ 93 asrset_t asrset; /* PCSASRS */ 94 #endif 95 prwatch_t prwatch; /* PCWATCH */ 96 priovec_t priovec; /* PCREAD, PCWRITE */ 97 prcred_t prcred; /* PCSCRED */ 98 prpriv_t prpriv; /* PCSPRIV */ 99 long przoneid; /* PCSZONE */ 100 } arg_t; 101 102 static int pr_control(long, arg_t *, prnode_t *, cred_t *); 103 104 static size_t 105 ctlsize(long cmd, size_t resid, arg_t *argp) 106 { 107 size_t size = sizeof (long); 108 size_t rnd; 109 int ngrp; 110 111 switch (cmd) { 112 case PCNULL: 113 case PCSTOP: 114 case PCDSTOP: 115 case PCWSTOP: 116 case PCCSIG: 117 case PCCFAULT: 118 break; 119 case PCSSIG: 120 size += sizeof (siginfo_t); 121 break; 122 case PCTWSTOP: 123 size += sizeof (long); 124 break; 125 case PCKILL: 126 case PCUNKILL: 127 case PCNICE: 128 size += sizeof (long); 129 break; 130 case PCRUN: 131 case PCSET: 132 case PCUNSET: 133 size += sizeof (ulong_t); 134 break; 135 case PCSVADDR: 136 size += sizeof (caddr_t); 137 break; 138 case PCSTRACE: 139 case PCSHOLD: 140 size += sizeof (sigset_t); 141 break; 142 case PCSFAULT: 143 size += sizeof (fltset_t); 144 break; 145 case PCSENTRY: 146 case PCSEXIT: 147 size += sizeof (sysset_t); 148 break; 149 case PCSREG: 150 case PCAGENT: 151 size += sizeof (prgregset_t); 152 break; 153 case PCSFPREG: 154 size += sizeof (prfpregset_t); 155 break; 156 #if defined(__sparc) 157 case PCSXREG: 158 size += sizeof (prxregset_t); 159 break; 160 case PCSASRS: 161 size += sizeof (asrset_t); 162 break; 163 #endif 164 case PCWATCH: 165 size += sizeof (prwatch_t); 166 break; 167 case PCREAD: 168 case PCWRITE: 169 size += sizeof (priovec_t); 170 break; 171 case PCSCRED: 172 size += sizeof (prcred_t); 173 break; 174 case PCSCREDX: 175 /* 176 * We cannot derefence the pr_ngroups fields if it 177 * we don't have enough data. 178 */ 179 if (resid < size + sizeof (prcred_t) - sizeof (gid_t)) 180 return (0); 181 ngrp = argp->prcred.pr_ngroups; 182 if (ngrp < 0 || ngrp > ngroups_max) 183 return (0); 184 185 /* The result can be smaller than sizeof (prcred_t) */ 186 size += sizeof (prcred_t) - sizeof (gid_t); 187 size += ngrp * sizeof (gid_t); 188 break; 189 case PCSPRIV: 190 if (resid >= size + sizeof (prpriv_t)) 191 size += priv_prgetprivsize(&argp->prpriv); 192 else 193 return (0); 194 break; 195 case PCSZONE: 196 size += sizeof (long); 197 break; 198 default: 199 return (0); 200 } 201 202 /* Round up to a multiple of long, unless exact amount written */ 203 if (size < resid) { 204 rnd = size & (sizeof (long) - 1); 205 206 if (rnd != 0) 207 size += sizeof (long) - rnd; 208 } 209 210 if (size > resid) 211 return (0); 212 return (size); 213 } 214 215 /* 216 * Control operations (lots). 217 */ 218 int 219 prwritectl(vnode_t *vp, uio_t *uiop, cred_t *cr) 220 { 221 #define MY_BUFFER_SIZE \ 222 100 > 1 + sizeof (arg_t) / sizeof (long) ? \ 223 100 : 1 + sizeof (arg_t) / sizeof (long) 224 long buf[MY_BUFFER_SIZE]; 225 long *bufp; 226 size_t resid = 0; 227 size_t size; 228 prnode_t *pnp = VTOP(vp); 229 int error; 230 int locked = 0; 231 232 while (uiop->uio_resid) { 233 /* 234 * Read several commands in one gulp. 235 */ 236 bufp = buf; 237 if (resid) { /* move incomplete command to front of buffer */ 238 long *tail; 239 240 if (resid >= sizeof (buf)) 241 break; 242 tail = (long *)((char *)buf + sizeof (buf) - resid); 243 do { 244 *bufp++ = *tail++; 245 } while ((resid -= sizeof (long)) != 0); 246 } 247 resid = sizeof (buf) - ((char *)bufp - (char *)buf); 248 if (resid > uiop->uio_resid) 249 resid = uiop->uio_resid; 250 if (error = uiomove((caddr_t)bufp, resid, UIO_WRITE, uiop)) 251 return (error); 252 resid += (char *)bufp - (char *)buf; 253 bufp = buf; 254 255 do { /* loop over commands in buffer */ 256 long cmd = bufp[0]; 257 arg_t *argp = (arg_t *)&bufp[1]; 258 259 size = ctlsize(cmd, resid, argp); 260 if (size == 0) /* incomplete or invalid command */ 261 break; 262 /* 263 * Perform the specified control operation. 264 */ 265 if (!locked) { 266 if ((error = prlock(pnp, ZNO)) != 0) 267 return (error); 268 locked = 1; 269 } 270 if (error = pr_control(cmd, argp, pnp, cr)) { 271 if (error == -1) /* -1 is timeout */ 272 locked = 0; 273 else 274 return (error); 275 } 276 bufp = (long *)((char *)bufp + size); 277 } while ((resid -= size) != 0); 278 279 if (locked) { 280 prunlock(pnp); 281 locked = 0; 282 } 283 } 284 return (resid? EINVAL : 0); 285 } 286 287 static int 288 pr_control(long cmd, arg_t *argp, prnode_t *pnp, cred_t *cr) 289 { 290 prcommon_t *pcp; 291 proc_t *p; 292 int unlocked; 293 int error = 0; 294 295 if (cmd == PCNULL) 296 return (0); 297 298 pcp = pnp->pr_common; 299 p = pcp->prc_proc; 300 ASSERT(p != NULL); 301 302 switch (cmd) { 303 304 default: 305 error = EINVAL; 306 break; 307 308 case PCSTOP: /* direct process or lwp to stop and wait for stop */ 309 case PCDSTOP: /* direct process or lwp to stop, don't wait */ 310 case PCWSTOP: /* wait for process or lwp to stop */ 311 case PCTWSTOP: /* wait for process or lwp to stop, with timeout */ 312 { 313 time_t timeo; 314 315 /* 316 * Can't apply to a system process. 317 */ 318 if ((p->p_flag & SSYS) || p->p_as == &kas) { 319 error = EBUSY; 320 break; 321 } 322 323 if (cmd == PCSTOP || cmd == PCDSTOP) 324 pr_stop(pnp); 325 326 if (cmd == PCDSTOP) 327 break; 328 329 /* 330 * If an lwp is waiting for itself or its process, 331 * don't wait. The stopped lwp would never see the 332 * fact that it is stopped. 333 */ 334 if ((pcp->prc_flags & PRC_LWP)? 335 (pcp->prc_thread == curthread) : (p == curproc)) { 336 if (cmd == PCWSTOP || cmd == PCTWSTOP) 337 error = EBUSY; 338 break; 339 } 340 341 timeo = (cmd == PCTWSTOP)? (time_t)argp->timeo : 0; 342 if ((error = pr_wait_stop(pnp, timeo)) != 0) 343 return (error); 344 345 break; 346 } 347 348 case PCRUN: /* make lwp or process runnable */ 349 error = pr_setrun(pnp, argp->flags); 350 break; 351 352 case PCSTRACE: /* set signal trace mask */ 353 pr_settrace(p, &argp->sigset); 354 break; 355 356 case PCSSIG: /* set current signal */ 357 error = pr_setsig(pnp, &argp->siginfo); 358 if (argp->siginfo.si_signo == SIGKILL && error == 0) { 359 prunlock(pnp); 360 pr_wait_die(pnp); 361 return (-1); 362 } 363 break; 364 365 case PCKILL: /* send signal */ 366 error = pr_kill(pnp, (int)argp->sig, cr); 367 if (error == 0 && argp->sig == SIGKILL) { 368 prunlock(pnp); 369 pr_wait_die(pnp); 370 return (-1); 371 } 372 break; 373 374 case PCUNKILL: /* delete a pending signal */ 375 error = pr_unkill(pnp, (int)argp->sig); 376 break; 377 378 case PCNICE: /* set nice priority */ 379 error = pr_nice(p, (int)argp->nice, cr); 380 break; 381 382 case PCSENTRY: /* set syscall entry bit mask */ 383 case PCSEXIT: /* set syscall exit bit mask */ 384 pr_setentryexit(p, &argp->sysset, cmd == PCSENTRY); 385 break; 386 387 case PCSET: /* set process flags */ 388 error = pr_set(p, argp->flags); 389 break; 390 391 case PCUNSET: /* unset process flags */ 392 error = pr_unset(p, argp->flags); 393 break; 394 395 case PCSREG: /* set general registers */ 396 { 397 kthread_t *t = pr_thread(pnp); 398 399 if (!ISTOPPED(t) && !VSTOPPED(t) && !DSTOPPED(t)) { 400 thread_unlock(t); 401 error = EBUSY; 402 } else { 403 thread_unlock(t); 404 mutex_exit(&p->p_lock); 405 prsetprregs(ttolwp(t), argp->prgregset, 0); 406 mutex_enter(&p->p_lock); 407 } 408 break; 409 } 410 411 case PCSFPREG: /* set floating-point registers */ 412 error = pr_setfpregs(pnp, &argp->prfpregset); 413 break; 414 415 case PCSXREG: /* set extra registers */ 416 #if defined(__sparc) 417 error = pr_setxregs(pnp, &argp->prxregset); 418 #else 419 error = EINVAL; 420 #endif 421 break; 422 423 #if defined(__sparc) 424 case PCSASRS: /* set ancillary state registers */ 425 error = pr_setasrs(pnp, argp->asrset); 426 break; 427 #endif 428 429 case PCSVADDR: /* set virtual address at which to resume */ 430 error = pr_setvaddr(pnp, argp->vaddr); 431 break; 432 433 case PCSHOLD: /* set signal-hold mask */ 434 pr_sethold(pnp, &argp->sigset); 435 break; 436 437 case PCSFAULT: /* set mask of traced faults */ 438 pr_setfault(p, &argp->fltset); 439 break; 440 441 case PCCSIG: /* clear current signal */ 442 error = pr_clearsig(pnp); 443 break; 444 445 case PCCFAULT: /* clear current fault */ 446 error = pr_clearflt(pnp); 447 break; 448 449 case PCWATCH: /* set or clear watched areas */ 450 error = pr_watch(pnp, &argp->prwatch, &unlocked); 451 if (error && unlocked) 452 return (error); 453 break; 454 455 case PCAGENT: /* create the /proc agent lwp in the target process */ 456 error = pr_agent(pnp, argp->prgregset, &unlocked); 457 if (error && unlocked) 458 return (error); 459 break; 460 461 case PCREAD: /* read from the address space */ 462 error = pr_rdwr(p, UIO_READ, &argp->priovec); 463 break; 464 465 case PCWRITE: /* write to the address space */ 466 error = pr_rdwr(p, UIO_WRITE, &argp->priovec); 467 break; 468 469 case PCSCRED: /* set the process credentials */ 470 case PCSCREDX: 471 error = pr_scred(p, &argp->prcred, cr, cmd == PCSCREDX); 472 break; 473 474 case PCSPRIV: /* set the process privileges */ 475 error = pr_spriv(p, &argp->prpriv, cr); 476 break; 477 case PCSZONE: /* set the process's zoneid credentials */ 478 error = pr_szoneid(p, (zoneid_t)argp->przoneid, cr); 479 break; 480 } 481 482 if (error) 483 prunlock(pnp); 484 return (error); 485 } 486 487 #ifdef _SYSCALL32_IMPL 488 489 typedef union { 490 int32_t sig; /* PCKILL, PCUNKILL */ 491 int32_t nice; /* PCNICE */ 492 int32_t timeo; /* PCTWSTOP */ 493 uint32_t flags; /* PCRUN, PCSET, PCUNSET */ 494 caddr32_t vaddr; /* PCSVADDR */ 495 siginfo32_t siginfo; /* PCSSIG */ 496 sigset_t sigset; /* PCSTRACE, PCSHOLD */ 497 fltset_t fltset; /* PCSFAULT */ 498 sysset_t sysset; /* PCSENTRY, PCSEXIT */ 499 prgregset32_t prgregset; /* PCSREG, PCAGENT */ 500 prfpregset32_t prfpregset; /* PCSFPREG */ 501 #if defined(__sparc) 502 prxregset_t prxregset; /* PCSXREG */ 503 #endif 504 prwatch32_t prwatch; /* PCWATCH */ 505 priovec32_t priovec; /* PCREAD, PCWRITE */ 506 prcred32_t prcred; /* PCSCRED */ 507 prpriv_t prpriv; /* PCSPRIV */ 508 int32_t przoneid; /* PCSZONE */ 509 } arg32_t; 510 511 static int pr_control32(int32_t, arg32_t *, prnode_t *, cred_t *); 512 static int pr_setfpregs32(prnode_t *, prfpregset32_t *); 513 514 /* 515 * Note that while ctlsize32() can use argp, it must do so only in a way 516 * that assumes 32-bit rather than 64-bit alignment as argp is a pointer 517 * to an array of 32-bit values and only 32-bit alignment is ensured. 518 */ 519 static size_t 520 ctlsize32(int32_t cmd, size_t resid, arg32_t *argp) 521 { 522 size_t size = sizeof (int32_t); 523 size_t rnd; 524 int ngrp; 525 526 switch (cmd) { 527 case PCNULL: 528 case PCSTOP: 529 case PCDSTOP: 530 case PCWSTOP: 531 case PCCSIG: 532 case PCCFAULT: 533 break; 534 case PCSSIG: 535 size += sizeof (siginfo32_t); 536 break; 537 case PCTWSTOP: 538 size += sizeof (int32_t); 539 break; 540 case PCKILL: 541 case PCUNKILL: 542 case PCNICE: 543 size += sizeof (int32_t); 544 break; 545 case PCRUN: 546 case PCSET: 547 case PCUNSET: 548 size += sizeof (uint32_t); 549 break; 550 case PCSVADDR: 551 size += sizeof (caddr32_t); 552 break; 553 case PCSTRACE: 554 case PCSHOLD: 555 size += sizeof (sigset_t); 556 break; 557 case PCSFAULT: 558 size += sizeof (fltset_t); 559 break; 560 case PCSENTRY: 561 case PCSEXIT: 562 size += sizeof (sysset_t); 563 break; 564 case PCSREG: 565 case PCAGENT: 566 size += sizeof (prgregset32_t); 567 break; 568 case PCSFPREG: 569 size += sizeof (prfpregset32_t); 570 break; 571 #if defined(__sparc) 572 case PCSXREG: 573 size += sizeof (prxregset_t); 574 break; 575 #endif 576 case PCWATCH: 577 size += sizeof (prwatch32_t); 578 break; 579 case PCREAD: 580 case PCWRITE: 581 size += sizeof (priovec32_t); 582 break; 583 case PCSCRED: 584 size += sizeof (prcred32_t); 585 break; 586 case PCSCREDX: 587 /* 588 * We cannot derefence the pr_ngroups fields if it 589 * we don't have enough data. 590 */ 591 if (resid < size + sizeof (prcred32_t) - sizeof (gid32_t)) 592 return (0); 593 ngrp = argp->prcred.pr_ngroups; 594 if (ngrp < 0 || ngrp > ngroups_max) 595 return (0); 596 597 /* The result can be smaller than sizeof (prcred32_t) */ 598 size += sizeof (prcred32_t) - sizeof (gid32_t); 599 size += ngrp * sizeof (gid32_t); 600 break; 601 case PCSPRIV: 602 if (resid >= size + sizeof (prpriv_t)) 603 size += priv_prgetprivsize(&argp->prpriv); 604 else 605 return (0); 606 break; 607 case PCSZONE: 608 size += sizeof (int32_t); 609 break; 610 default: 611 return (0); 612 } 613 614 /* Round up to a multiple of int32_t */ 615 rnd = size & (sizeof (int32_t) - 1); 616 617 if (rnd != 0) 618 size += sizeof (int32_t) - rnd; 619 620 if (size > resid) 621 return (0); 622 return (size); 623 } 624 625 /* 626 * Control operations (lots). 627 */ 628 int 629 prwritectl32(struct vnode *vp, struct uio *uiop, cred_t *cr) 630 { 631 #define MY_BUFFER_SIZE32 \ 632 100 > 1 + sizeof (arg32_t) / sizeof (int32_t) ? \ 633 100 : 1 + sizeof (arg32_t) / sizeof (int32_t) 634 int32_t buf[MY_BUFFER_SIZE32]; 635 int32_t *bufp; 636 arg32_t arg; 637 size_t resid = 0; 638 size_t size; 639 prnode_t *pnp = VTOP(vp); 640 int error; 641 int locked = 0; 642 643 while (uiop->uio_resid) { 644 /* 645 * Read several commands in one gulp. 646 */ 647 bufp = buf; 648 if (resid) { /* move incomplete command to front of buffer */ 649 int32_t *tail; 650 651 if (resid >= sizeof (buf)) 652 break; 653 tail = (int32_t *)((char *)buf + sizeof (buf) - resid); 654 do { 655 *bufp++ = *tail++; 656 } while ((resid -= sizeof (int32_t)) != 0); 657 } 658 resid = sizeof (buf) - ((char *)bufp - (char *)buf); 659 if (resid > uiop->uio_resid) 660 resid = uiop->uio_resid; 661 if (error = uiomove((caddr_t)bufp, resid, UIO_WRITE, uiop)) 662 return (error); 663 resid += (char *)bufp - (char *)buf; 664 bufp = buf; 665 666 do { /* loop over commands in buffer */ 667 int32_t cmd = bufp[0]; 668 arg32_t *argp = (arg32_t *)&bufp[1]; 669 670 size = ctlsize32(cmd, resid, argp); 671 if (size == 0) /* incomplete or invalid command */ 672 break; 673 /* 674 * Perform the specified control operation. 675 */ 676 if (!locked) { 677 if ((error = prlock(pnp, ZNO)) != 0) 678 return (error); 679 locked = 1; 680 } 681 682 /* 683 * Since some members of the arg32_t union contain 684 * 64-bit values (which must be 64-bit aligned), we 685 * can't simply pass a pointer to the structure as 686 * it may be unaligned. Note that we do pass the 687 * potentially unaligned structure to ctlsize32() 688 * above, but that uses it a way that makes no 689 * assumptions about alignment. 690 */ 691 ASSERT(size - sizeof (cmd) <= sizeof (arg)); 692 bcopy(argp, &arg, size - sizeof (cmd)); 693 694 if (error = pr_control32(cmd, &arg, pnp, cr)) { 695 if (error == -1) /* -1 is timeout */ 696 locked = 0; 697 else 698 return (error); 699 } 700 bufp = (int32_t *)((char *)bufp + size); 701 } while ((resid -= size) != 0); 702 703 if (locked) { 704 prunlock(pnp); 705 locked = 0; 706 } 707 } 708 return (resid? EINVAL : 0); 709 } 710 711 static int 712 pr_control32(int32_t cmd, arg32_t *argp, prnode_t *pnp, cred_t *cr) 713 { 714 prcommon_t *pcp; 715 proc_t *p; 716 int unlocked; 717 int error = 0; 718 719 if (cmd == PCNULL) 720 return (0); 721 722 pcp = pnp->pr_common; 723 p = pcp->prc_proc; 724 ASSERT(p != NULL); 725 726 switch (cmd) { 727 728 default: 729 error = EINVAL; 730 break; 731 732 case PCSTOP: /* direct process or lwp to stop and wait for stop */ 733 case PCDSTOP: /* direct process or lwp to stop, don't wait */ 734 case PCWSTOP: /* wait for process or lwp to stop */ 735 case PCTWSTOP: /* wait for process or lwp to stop, with timeout */ 736 { 737 time_t timeo; 738 739 /* 740 * Can't apply to a system process. 741 */ 742 if ((p->p_flag & SSYS) || p->p_as == &kas) { 743 error = EBUSY; 744 break; 745 } 746 747 if (cmd == PCSTOP || cmd == PCDSTOP) 748 pr_stop(pnp); 749 750 if (cmd == PCDSTOP) 751 break; 752 753 /* 754 * If an lwp is waiting for itself or its process, 755 * don't wait. The lwp will never see the fact that 756 * itself is stopped. 757 */ 758 if ((pcp->prc_flags & PRC_LWP)? 759 (pcp->prc_thread == curthread) : (p == curproc)) { 760 if (cmd == PCWSTOP || cmd == PCTWSTOP) 761 error = EBUSY; 762 break; 763 } 764 765 timeo = (cmd == PCTWSTOP)? (time_t)argp->timeo : 0; 766 if ((error = pr_wait_stop(pnp, timeo)) != 0) 767 return (error); 768 769 break; 770 } 771 772 case PCRUN: /* make lwp or process runnable */ 773 error = pr_setrun(pnp, (ulong_t)argp->flags); 774 break; 775 776 case PCSTRACE: /* set signal trace mask */ 777 pr_settrace(p, &argp->sigset); 778 break; 779 780 case PCSSIG: /* set current signal */ 781 if (PROCESS_NOT_32BIT(p)) 782 error = EOVERFLOW; 783 else { 784 int sig = (int)argp->siginfo.si_signo; 785 siginfo_t siginfo; 786 787 bzero(&siginfo, sizeof (siginfo)); 788 siginfo_32tok(&argp->siginfo, (k_siginfo_t *)&siginfo); 789 error = pr_setsig(pnp, &siginfo); 790 if (sig == SIGKILL && error == 0) { 791 prunlock(pnp); 792 pr_wait_die(pnp); 793 return (-1); 794 } 795 } 796 break; 797 798 case PCKILL: /* send signal */ 799 error = pr_kill(pnp, (int)argp->sig, cr); 800 if (error == 0 && argp->sig == SIGKILL) { 801 prunlock(pnp); 802 pr_wait_die(pnp); 803 return (-1); 804 } 805 break; 806 807 case PCUNKILL: /* delete a pending signal */ 808 error = pr_unkill(pnp, (int)argp->sig); 809 break; 810 811 case PCNICE: /* set nice priority */ 812 error = pr_nice(p, (int)argp->nice, cr); 813 break; 814 815 case PCSENTRY: /* set syscall entry bit mask */ 816 case PCSEXIT: /* set syscall exit bit mask */ 817 pr_setentryexit(p, &argp->sysset, cmd == PCSENTRY); 818 break; 819 820 case PCSET: /* set process flags */ 821 error = pr_set(p, (long)argp->flags); 822 break; 823 824 case PCUNSET: /* unset process flags */ 825 error = pr_unset(p, (long)argp->flags); 826 break; 827 828 case PCSREG: /* set general registers */ 829 if (PROCESS_NOT_32BIT(p)) 830 error = EOVERFLOW; 831 else { 832 kthread_t *t = pr_thread(pnp); 833 834 if (!ISTOPPED(t) && !VSTOPPED(t) && !DSTOPPED(t)) { 835 thread_unlock(t); 836 error = EBUSY; 837 } else { 838 prgregset_t prgregset; 839 klwp_t *lwp = ttolwp(t); 840 841 thread_unlock(t); 842 mutex_exit(&p->p_lock); 843 prgregset_32ton(lwp, argp->prgregset, 844 prgregset); 845 prsetprregs(lwp, prgregset, 0); 846 mutex_enter(&p->p_lock); 847 } 848 } 849 break; 850 851 case PCSFPREG: /* set floating-point registers */ 852 if (PROCESS_NOT_32BIT(p)) 853 error = EOVERFLOW; 854 else 855 error = pr_setfpregs32(pnp, &argp->prfpregset); 856 break; 857 858 case PCSXREG: /* set extra registers */ 859 #if defined(__sparc) 860 if (PROCESS_NOT_32BIT(p)) 861 error = EOVERFLOW; 862 else 863 error = pr_setxregs(pnp, &argp->prxregset); 864 #else 865 error = EINVAL; 866 #endif 867 break; 868 869 case PCSVADDR: /* set virtual address at which to resume */ 870 if (PROCESS_NOT_32BIT(p)) 871 error = EOVERFLOW; 872 else 873 error = pr_setvaddr(pnp, 874 (caddr_t)(uintptr_t)argp->vaddr); 875 break; 876 877 case PCSHOLD: /* set signal-hold mask */ 878 pr_sethold(pnp, &argp->sigset); 879 break; 880 881 case PCSFAULT: /* set mask of traced faults */ 882 pr_setfault(p, &argp->fltset); 883 break; 884 885 case PCCSIG: /* clear current signal */ 886 error = pr_clearsig(pnp); 887 break; 888 889 case PCCFAULT: /* clear current fault */ 890 error = pr_clearflt(pnp); 891 break; 892 893 case PCWATCH: /* set or clear watched areas */ 894 if (PROCESS_NOT_32BIT(p)) 895 error = EOVERFLOW; 896 else { 897 prwatch_t prwatch; 898 899 prwatch.pr_vaddr = argp->prwatch.pr_vaddr; 900 prwatch.pr_size = argp->prwatch.pr_size; 901 prwatch.pr_wflags = argp->prwatch.pr_wflags; 902 prwatch.pr_pad = argp->prwatch.pr_pad; 903 error = pr_watch(pnp, &prwatch, &unlocked); 904 if (error && unlocked) 905 return (error); 906 } 907 break; 908 909 case PCAGENT: /* create the /proc agent lwp in the target process */ 910 if (PROCESS_NOT_32BIT(p)) 911 error = EOVERFLOW; 912 else { 913 prgregset_t prgregset; 914 kthread_t *t = pr_thread(pnp); 915 klwp_t *lwp = ttolwp(t); 916 thread_unlock(t); 917 mutex_exit(&p->p_lock); 918 prgregset_32ton(lwp, argp->prgregset, prgregset); 919 mutex_enter(&p->p_lock); 920 error = pr_agent(pnp, prgregset, &unlocked); 921 if (error && unlocked) 922 return (error); 923 } 924 break; 925 926 case PCREAD: /* read from the address space */ 927 case PCWRITE: /* write to the address space */ 928 if (PROCESS_NOT_32BIT(p)) 929 error = EOVERFLOW; 930 else { 931 enum uio_rw rw = (cmd == PCREAD)? UIO_READ : UIO_WRITE; 932 priovec_t priovec; 933 934 priovec.pio_base = 935 (void *)(uintptr_t)argp->priovec.pio_base; 936 priovec.pio_len = (size_t)argp->priovec.pio_len; 937 priovec.pio_offset = (off_t) 938 (uint32_t)argp->priovec.pio_offset; 939 error = pr_rdwr(p, rw, &priovec); 940 } 941 break; 942 943 case PCSCRED: /* set the process credentials */ 944 case PCSCREDX: 945 { 946 /* 947 * All the fields in these structures are exactly the 948 * same and so the structures are compatible. In case 949 * this ever changes, we catch this with the ASSERT 950 * below. 951 */ 952 prcred_t *prcred = (prcred_t *)&argp->prcred; 953 954 #ifndef __lint 955 ASSERT(sizeof (prcred_t) == sizeof (prcred32_t)); 956 #endif 957 958 error = pr_scred(p, prcred, cr, cmd == PCSCREDX); 959 break; 960 } 961 962 case PCSPRIV: /* set the process privileges */ 963 error = pr_spriv(p, &argp->prpriv, cr); 964 break; 965 966 case PCSZONE: /* set the process's zoneid */ 967 error = pr_szoneid(p, (zoneid_t)argp->przoneid, cr); 968 break; 969 } 970 971 if (error) 972 prunlock(pnp); 973 return (error); 974 } 975 976 #endif /* _SYSCALL32_IMPL */ 977 978 /* 979 * Return the specific or chosen thread/lwp for a control operation. 980 * Returns with the thread locked via thread_lock(t). 981 */ 982 kthread_t * 983 pr_thread(prnode_t *pnp) 984 { 985 prcommon_t *pcp = pnp->pr_common; 986 kthread_t *t; 987 988 if (pcp->prc_flags & PRC_LWP) { 989 t = pcp->prc_thread; 990 ASSERT(t != NULL); 991 thread_lock(t); 992 } else { 993 proc_t *p = pcp->prc_proc; 994 t = prchoose(p); /* returns locked thread */ 995 ASSERT(t != NULL); 996 } 997 998 return (t); 999 } 1000 1001 /* 1002 * Direct the process or lwp to stop. 1003 */ 1004 void 1005 pr_stop(prnode_t *pnp) 1006 { 1007 prcommon_t *pcp = pnp->pr_common; 1008 proc_t *p = pcp->prc_proc; 1009 kthread_t *t; 1010 vnode_t *vp; 1011 1012 /* 1013 * If already stopped, do nothing; otherwise flag 1014 * it to be stopped the next time it tries to run. 1015 * If sleeping at interruptible priority, set it 1016 * running so it will stop within cv_wait_sig(). 1017 * 1018 * Take care to cooperate with jobcontrol: if an lwp 1019 * is stopped due to the default action of a jobcontrol 1020 * stop signal, flag it to be stopped the next time it 1021 * starts due to a SIGCONT signal. 1022 */ 1023 if (pcp->prc_flags & PRC_LWP) 1024 t = pcp->prc_thread; 1025 else 1026 t = p->p_tlist; 1027 ASSERT(t != NULL); 1028 1029 do { 1030 int notify; 1031 1032 notify = 0; 1033 thread_lock(t); 1034 if (!ISTOPPED(t)) { 1035 t->t_proc_flag |= TP_PRSTOP; 1036 t->t_sig_check = 1; /* do ISSIG */ 1037 } 1038 1039 /* Move the thread from wait queue to run queue */ 1040 if (ISWAITING(t)) 1041 setrun_locked(t); 1042 1043 if (ISWAKEABLE(t)) { 1044 if (t->t_wchan0 == NULL) 1045 setrun_locked(t); 1046 else if (!VSTOPPED(t)) { 1047 /* 1048 * Mark it virtually stopped. 1049 */ 1050 t->t_proc_flag |= TP_PRVSTOP; 1051 notify = 1; 1052 } 1053 } 1054 /* 1055 * force the thread into the kernel 1056 * if it is not already there. 1057 */ 1058 prpokethread(t); 1059 thread_unlock(t); 1060 if (notify && 1061 (vp = p->p_lwpdir[t->t_dslot].ld_entry->le_trace) != NULL) 1062 prnotify(vp); 1063 if (pcp->prc_flags & PRC_LWP) 1064 break; 1065 } while ((t = t->t_forw) != p->p_tlist); 1066 1067 /* 1068 * We do this just in case the thread we asked 1069 * to stop is in holdlwps() (called from cfork()). 1070 */ 1071 cv_broadcast(&p->p_holdlwps); 1072 } 1073 1074 /* 1075 * Sleep until the lwp stops, but cooperate with 1076 * jobcontrol: Don't wake up if the lwp is stopped 1077 * due to the default action of a jobcontrol stop signal. 1078 * If this is the process file descriptor, sleep 1079 * until all of the process's lwps stop. 1080 */ 1081 int 1082 pr_wait_stop(prnode_t *pnp, time_t timeo) 1083 { 1084 prcommon_t *pcp = pnp->pr_common; 1085 proc_t *p = pcp->prc_proc; 1086 timestruc_t rqtime; 1087 timestruc_t *rqtp = NULL; 1088 int timecheck = 0; 1089 kthread_t *t; 1090 int error; 1091 1092 if (timeo > 0) { /* millisecond timeout */ 1093 /* 1094 * Determine the precise future time of the requested timeout. 1095 */ 1096 timestruc_t now; 1097 1098 timecheck = timechanged; 1099 gethrestime(&now); 1100 rqtp = &rqtime; 1101 rqtp->tv_sec = timeo / MILLISEC; 1102 rqtp->tv_nsec = (timeo % MILLISEC) * MICROSEC; 1103 timespecadd(rqtp, &now); 1104 } 1105 1106 if (pcp->prc_flags & PRC_LWP) { /* lwp file descriptor */ 1107 t = pcp->prc_thread; 1108 ASSERT(t != NULL); 1109 thread_lock(t); 1110 while (!ISTOPPED(t) && !VSTOPPED(t)) { 1111 thread_unlock(t); 1112 mutex_enter(&pcp->prc_mutex); 1113 prunlock(pnp); 1114 error = pr_wait(pcp, rqtp, timecheck); 1115 if (error) /* -1 is timeout */ 1116 return (error); 1117 if ((error = prlock(pnp, ZNO)) != 0) 1118 return (error); 1119 ASSERT(p == pcp->prc_proc); 1120 ASSERT(t == pcp->prc_thread); 1121 thread_lock(t); 1122 } 1123 thread_unlock(t); 1124 } else { /* process file descriptor */ 1125 t = prchoose(p); /* returns locked thread */ 1126 ASSERT(t != NULL); 1127 ASSERT(MUTEX_HELD(&p->p_lock)); 1128 while ((!ISTOPPED(t) && !VSTOPPED(t) && !SUSPENDED(t)) || 1129 (p->p_flag & SEXITLWPS)) { 1130 thread_unlock(t); 1131 mutex_enter(&pcp->prc_mutex); 1132 prunlock(pnp); 1133 error = pr_wait(pcp, rqtp, timecheck); 1134 if (error) /* -1 is timeout */ 1135 return (error); 1136 if ((error = prlock(pnp, ZNO)) != 0) 1137 return (error); 1138 ASSERT(p == pcp->prc_proc); 1139 t = prchoose(p); /* returns locked t */ 1140 ASSERT(t != NULL); 1141 } 1142 thread_unlock(t); 1143 } 1144 1145 ASSERT(!(pcp->prc_flags & PRC_DESTROY) && p->p_stat != SZOMB && 1146 t != NULL && t->t_state != TS_ZOMB); 1147 1148 return (0); 1149 } 1150 1151 int 1152 pr_setrun(prnode_t *pnp, ulong_t flags) 1153 { 1154 prcommon_t *pcp = pnp->pr_common; 1155 proc_t *p = pcp->prc_proc; 1156 kthread_t *t; 1157 klwp_t *lwp; 1158 1159 /* 1160 * Cannot set an lwp running if it is not stopped. 1161 * Also, no lwp other than the /proc agent lwp can 1162 * be set running so long as the /proc agent lwp exists. 1163 */ 1164 t = pr_thread(pnp); /* returns locked thread */ 1165 if ((!ISTOPPED(t) && !VSTOPPED(t) && 1166 !(t->t_proc_flag & TP_PRSTOP)) || 1167 (p->p_agenttp != NULL && 1168 (t != p->p_agenttp || !(pcp->prc_flags & PRC_LWP)))) { 1169 thread_unlock(t); 1170 return (EBUSY); 1171 } 1172 thread_unlock(t); 1173 if (flags & ~(PRCSIG|PRCFAULT|PRSTEP|PRSTOP|PRSABORT)) 1174 return (EINVAL); 1175 lwp = ttolwp(t); 1176 if ((flags & PRCSIG) && lwp->lwp_cursig != SIGKILL) { 1177 /* 1178 * Discard current siginfo_t, if any. 1179 */ 1180 lwp->lwp_cursig = 0; 1181 lwp->lwp_extsig = 0; 1182 if (lwp->lwp_curinfo) { 1183 siginfofree(lwp->lwp_curinfo); 1184 lwp->lwp_curinfo = NULL; 1185 } 1186 } 1187 if (flags & PRCFAULT) 1188 lwp->lwp_curflt = 0; 1189 /* 1190 * We can't hold p->p_lock when we touch the lwp's registers. 1191 * It may be swapped out and we will get a page fault. 1192 */ 1193 if (flags & PRSTEP) { 1194 mutex_exit(&p->p_lock); 1195 prstep(lwp, 0); 1196 mutex_enter(&p->p_lock); 1197 } 1198 if (flags & PRSTOP) { 1199 t->t_proc_flag |= TP_PRSTOP; 1200 t->t_sig_check = 1; /* do ISSIG */ 1201 } 1202 if (flags & PRSABORT) 1203 lwp->lwp_sysabort = 1; 1204 thread_lock(t); 1205 if ((pcp->prc_flags & PRC_LWP) || (flags & (PRSTEP|PRSTOP))) { 1206 /* 1207 * Here, we are dealing with a single lwp. 1208 */ 1209 if (ISTOPPED(t)) { 1210 t->t_schedflag |= TS_PSTART; 1211 t->t_dtrace_stop = 0; 1212 setrun_locked(t); 1213 } else if (flags & PRSABORT) { 1214 t->t_proc_flag &= 1215 ~(TP_PRSTOP|TP_PRVSTOP|TP_STOPPING); 1216 setrun_locked(t); 1217 } else if (!(flags & PRSTOP)) { 1218 t->t_proc_flag &= 1219 ~(TP_PRSTOP|TP_PRVSTOP|TP_STOPPING); 1220 } 1221 thread_unlock(t); 1222 } else { 1223 /* 1224 * Here, we are dealing with the whole process. 1225 */ 1226 if (ISTOPPED(t)) { 1227 /* 1228 * The representative lwp is stopped on an event 1229 * of interest. We demote it to PR_REQUESTED and 1230 * choose another representative lwp. If the new 1231 * representative lwp is not stopped on an event of 1232 * interest (other than PR_REQUESTED), we set the 1233 * whole process running, else we leave the process 1234 * stopped showing the next event of interest. 1235 */ 1236 kthread_t *tx = NULL; 1237 1238 if (!(flags & PRSABORT) && 1239 t->t_whystop == PR_SYSENTRY && 1240 t->t_whatstop == SYS_lwp_exit) 1241 tx = t; /* remember the exiting lwp */ 1242 t->t_whystop = PR_REQUESTED; 1243 t->t_whatstop = 0; 1244 thread_unlock(t); 1245 t = prchoose(p); /* returns locked t */ 1246 ASSERT(ISTOPPED(t) || VSTOPPED(t)); 1247 if (VSTOPPED(t) || 1248 t->t_whystop == PR_REQUESTED) { 1249 thread_unlock(t); 1250 allsetrun(p); 1251 } else { 1252 thread_unlock(t); 1253 /* 1254 * As a special case, if the old representative 1255 * lwp was stopped on entry to _lwp_exit() 1256 * (and we are not aborting the system call), 1257 * we set the old representative lwp running. 1258 * We do this so that the next process stop 1259 * will find the exiting lwp gone. 1260 */ 1261 if (tx != NULL) { 1262 thread_lock(tx); 1263 tx->t_schedflag |= TS_PSTART; 1264 t->t_dtrace_stop = 0; 1265 setrun_locked(tx); 1266 thread_unlock(tx); 1267 } 1268 } 1269 } else { 1270 /* 1271 * No event of interest; set all of the lwps running. 1272 */ 1273 if (flags & PRSABORT) { 1274 t->t_proc_flag &= 1275 ~(TP_PRSTOP|TP_PRVSTOP|TP_STOPPING); 1276 setrun_locked(t); 1277 } 1278 thread_unlock(t); 1279 allsetrun(p); 1280 } 1281 } 1282 return (0); 1283 } 1284 1285 /* 1286 * Wait until process/lwp stops or until timer expires. 1287 * Return EINTR for an interruption, -1 for timeout, else 0. 1288 */ 1289 int 1290 pr_wait(prcommon_t *pcp, /* prcommon referring to process/lwp */ 1291 timestruc_t *ts, /* absolute time of timeout, if any */ 1292 int timecheck) 1293 { 1294 int rval; 1295 1296 ASSERT(MUTEX_HELD(&pcp->prc_mutex)); 1297 rval = cv_waituntil_sig(&pcp->prc_wait, &pcp->prc_mutex, ts, timecheck); 1298 mutex_exit(&pcp->prc_mutex); 1299 switch (rval) { 1300 case 0: 1301 return (EINTR); 1302 case -1: 1303 return (-1); 1304 default: 1305 return (0); 1306 } 1307 } 1308 1309 /* 1310 * Make all threads in the process runnable. 1311 */ 1312 void 1313 allsetrun(proc_t *p) 1314 { 1315 kthread_t *t; 1316 1317 ASSERT(MUTEX_HELD(&p->p_lock)); 1318 1319 if ((t = p->p_tlist) != NULL) { 1320 do { 1321 thread_lock(t); 1322 ASSERT(!(t->t_proc_flag & TP_LWPEXIT)); 1323 t->t_proc_flag &= ~(TP_PRSTOP|TP_PRVSTOP|TP_STOPPING); 1324 if (ISTOPPED(t)) { 1325 t->t_schedflag |= TS_PSTART; 1326 t->t_dtrace_stop = 0; 1327 setrun_locked(t); 1328 } 1329 thread_unlock(t); 1330 } while ((t = t->t_forw) != p->p_tlist); 1331 } 1332 } 1333 1334 /* 1335 * Wait for the process to die. 1336 * We do this after sending SIGKILL because we know it will 1337 * die soon and we want subsequent operations to return ENOENT. 1338 */ 1339 void 1340 pr_wait_die(prnode_t *pnp) 1341 { 1342 proc_t *p; 1343 1344 mutex_enter(&pidlock); 1345 while ((p = pnp->pr_common->prc_proc) != NULL && p->p_stat != SZOMB) { 1346 if (!cv_wait_sig(&p->p_srwchan_cv, &pidlock)) 1347 break; 1348 } 1349 mutex_exit(&pidlock); 1350 } 1351 1352 static void 1353 pr_settrace(proc_t *p, sigset_t *sp) 1354 { 1355 prdelset(sp, SIGKILL); 1356 prassignset(&p->p_sigmask, sp); 1357 if (!sigisempty(&p->p_sigmask)) 1358 p->p_proc_flag |= P_PR_TRACE; 1359 else if (prisempty(&p->p_fltmask)) { 1360 user_t *up = PTOU(p); 1361 if (up->u_systrap == 0) 1362 p->p_proc_flag &= ~P_PR_TRACE; 1363 } 1364 } 1365 1366 int 1367 pr_setsig(prnode_t *pnp, siginfo_t *sip) 1368 { 1369 int sig = sip->si_signo; 1370 prcommon_t *pcp = pnp->pr_common; 1371 proc_t *p = pcp->prc_proc; 1372 kthread_t *t; 1373 klwp_t *lwp; 1374 int error = 0; 1375 1376 t = pr_thread(pnp); /* returns locked thread */ 1377 thread_unlock(t); 1378 lwp = ttolwp(t); 1379 if (sig < 0 || sig >= NSIG) 1380 /* Zero allowed here */ 1381 error = EINVAL; 1382 else if (lwp->lwp_cursig == SIGKILL) 1383 /* "can't happen", but just in case */ 1384 error = EBUSY; 1385 else if ((lwp->lwp_cursig = (uchar_t)sig) == 0) { 1386 lwp->lwp_extsig = 0; 1387 /* 1388 * Discard current siginfo_t, if any. 1389 */ 1390 if (lwp->lwp_curinfo) { 1391 siginfofree(lwp->lwp_curinfo); 1392 lwp->lwp_curinfo = NULL; 1393 } 1394 } else { 1395 kthread_t *tx; 1396 sigqueue_t *sqp; 1397 1398 /* drop p_lock to do kmem_alloc(KM_SLEEP) */ 1399 mutex_exit(&p->p_lock); 1400 sqp = kmem_zalloc(sizeof (sigqueue_t), KM_SLEEP); 1401 mutex_enter(&p->p_lock); 1402 1403 if (lwp->lwp_curinfo == NULL) 1404 lwp->lwp_curinfo = sqp; 1405 else 1406 kmem_free(sqp, sizeof (sigqueue_t)); 1407 /* 1408 * Copy contents of info to current siginfo_t. 1409 */ 1410 bcopy(sip, &lwp->lwp_curinfo->sq_info, 1411 sizeof (lwp->lwp_curinfo->sq_info)); 1412 /* 1413 * Prevent contents published by si_zoneid-unaware /proc 1414 * consumers from being incorrectly filtered. Because 1415 * an uninitialized si_zoneid is the same as 1416 * GLOBAL_ZONEID, this means that you can't pr_setsig a 1417 * process in a non-global zone with a siginfo which 1418 * appears to come from the global zone. 1419 */ 1420 if (SI_FROMUSER(sip) && sip->si_zoneid == 0) 1421 lwp->lwp_curinfo->sq_info.si_zoneid = 1422 p->p_zone->zone_id; 1423 /* 1424 * Side-effects for SIGKILL and jobcontrol signals. 1425 */ 1426 if (sig == SIGKILL) { 1427 p->p_flag |= SKILLED; 1428 p->p_flag &= ~SEXTKILLED; 1429 } else if (sig == SIGCONT) { 1430 p->p_flag |= SSCONT; 1431 sigdelq(p, NULL, SIGSTOP); 1432 sigdelq(p, NULL, SIGTSTP); 1433 sigdelq(p, NULL, SIGTTOU); 1434 sigdelq(p, NULL, SIGTTIN); 1435 sigdiffset(&p->p_sig, &stopdefault); 1436 sigdiffset(&p->p_extsig, &stopdefault); 1437 if ((tx = p->p_tlist) != NULL) { 1438 do { 1439 sigdelq(p, tx, SIGSTOP); 1440 sigdelq(p, tx, SIGTSTP); 1441 sigdelq(p, tx, SIGTTOU); 1442 sigdelq(p, tx, SIGTTIN); 1443 sigdiffset(&tx->t_sig, &stopdefault); 1444 sigdiffset(&tx->t_extsig, &stopdefault); 1445 } while ((tx = tx->t_forw) != p->p_tlist); 1446 } 1447 } else if (sigismember(&stopdefault, sig)) { 1448 if (PTOU(p)->u_signal[sig-1] == SIG_DFL && 1449 (sig == SIGSTOP || !p->p_pgidp->pid_pgorphaned)) 1450 p->p_flag &= ~SSCONT; 1451 sigdelq(p, NULL, SIGCONT); 1452 sigdelset(&p->p_sig, SIGCONT); 1453 sigdelset(&p->p_extsig, SIGCONT); 1454 if ((tx = p->p_tlist) != NULL) { 1455 do { 1456 sigdelq(p, tx, SIGCONT); 1457 sigdelset(&tx->t_sig, SIGCONT); 1458 sigdelset(&tx->t_extsig, SIGCONT); 1459 } while ((tx = tx->t_forw) != p->p_tlist); 1460 } 1461 } 1462 thread_lock(t); 1463 if (ISWAKEABLE(t) || ISWAITING(t)) { 1464 /* Set signaled sleeping/waiting lwp running */ 1465 setrun_locked(t); 1466 } else if (t->t_state == TS_STOPPED && sig == SIGKILL) { 1467 /* If SIGKILL, set stopped lwp running */ 1468 p->p_stopsig = 0; 1469 t->t_schedflag |= TS_XSTART | TS_PSTART; 1470 t->t_dtrace_stop = 0; 1471 setrun_locked(t); 1472 } 1473 t->t_sig_check = 1; /* so ISSIG will be done */ 1474 thread_unlock(t); 1475 /* 1476 * More jobcontrol side-effects. 1477 */ 1478 if (sig == SIGCONT && (tx = p->p_tlist) != NULL) { 1479 p->p_stopsig = 0; 1480 do { 1481 thread_lock(tx); 1482 if (tx->t_state == TS_STOPPED && 1483 tx->t_whystop == PR_JOBCONTROL) { 1484 tx->t_schedflag |= TS_XSTART; 1485 setrun_locked(tx); 1486 } 1487 thread_unlock(tx); 1488 } while ((tx = tx->t_forw) != p->p_tlist); 1489 } 1490 } 1491 return (error); 1492 } 1493 1494 int 1495 pr_kill(prnode_t *pnp, int sig, cred_t *cr) 1496 { 1497 prcommon_t *pcp = pnp->pr_common; 1498 proc_t *p = pcp->prc_proc; 1499 k_siginfo_t info; 1500 1501 if (sig <= 0 || sig >= NSIG) 1502 return (EINVAL); 1503 1504 bzero(&info, sizeof (info)); 1505 info.si_signo = sig; 1506 info.si_code = SI_USER; 1507 info.si_pid = curproc->p_pid; 1508 info.si_ctid = PRCTID(curproc); 1509 info.si_zoneid = getzoneid(); 1510 info.si_uid = crgetruid(cr); 1511 sigaddq(p, (pcp->prc_flags & PRC_LWP)? 1512 pcp->prc_thread : NULL, &info, KM_NOSLEEP); 1513 1514 return (0); 1515 } 1516 1517 int 1518 pr_unkill(prnode_t *pnp, int sig) 1519 { 1520 prcommon_t *pcp = pnp->pr_common; 1521 proc_t *p = pcp->prc_proc; 1522 sigqueue_t *infop = NULL; 1523 1524 if (sig <= 0 || sig >= NSIG || sig == SIGKILL) 1525 return (EINVAL); 1526 1527 if (pcp->prc_flags & PRC_LWP) 1528 sigdeq(p, pcp->prc_thread, sig, &infop); 1529 else 1530 sigdeq(p, NULL, sig, &infop); 1531 1532 if (infop) 1533 siginfofree(infop); 1534 1535 return (0); 1536 } 1537 1538 int 1539 pr_nice(proc_t *p, int nice, cred_t *cr) 1540 { 1541 kthread_t *t; 1542 int err; 1543 int error = 0; 1544 1545 t = p->p_tlist; 1546 do { 1547 ASSERT(!(t->t_proc_flag & TP_LWPEXIT)); 1548 err = CL_DONICE(t, cr, nice, (int *)NULL); 1549 schedctl_set_cidpri(t); 1550 if (error == 0) 1551 error = err; 1552 } while ((t = t->t_forw) != p->p_tlist); 1553 1554 return (error); 1555 } 1556 1557 void 1558 pr_setentryexit(proc_t *p, sysset_t *sysset, int entry) 1559 { 1560 user_t *up = PTOU(p); 1561 1562 if (entry) { 1563 prassignset(&up->u_entrymask, sysset); 1564 } else { 1565 prassignset(&up->u_exitmask, sysset); 1566 } 1567 if (!prisempty(&up->u_entrymask) || 1568 !prisempty(&up->u_exitmask)) { 1569 up->u_systrap = 1; 1570 p->p_proc_flag |= P_PR_TRACE; 1571 set_proc_sys(p); /* set pre and post-sys flags */ 1572 } else { 1573 up->u_systrap = 0; 1574 if (sigisempty(&p->p_sigmask) && 1575 prisempty(&p->p_fltmask)) 1576 p->p_proc_flag &= ~P_PR_TRACE; 1577 } 1578 } 1579 1580 #define ALLFLAGS \ 1581 (PR_FORK|PR_RLC|PR_KLC|PR_ASYNC|PR_BPTADJ|PR_MSACCT|PR_MSFORK|PR_PTRACE) 1582 1583 int 1584 pr_set(proc_t *p, long flags) 1585 { 1586 if ((p->p_flag & SSYS) || p->p_as == &kas) 1587 return (EBUSY); 1588 1589 if (flags & ~ALLFLAGS) 1590 return (EINVAL); 1591 1592 if (flags & PR_FORK) 1593 p->p_proc_flag |= P_PR_FORK; 1594 if (flags & PR_RLC) 1595 p->p_proc_flag |= P_PR_RUNLCL; 1596 if (flags & PR_KLC) 1597 p->p_proc_flag |= P_PR_KILLCL; 1598 if (flags & PR_ASYNC) 1599 p->p_proc_flag |= P_PR_ASYNC; 1600 if (flags & PR_BPTADJ) 1601 p->p_proc_flag |= P_PR_BPTADJ; 1602 if (flags & PR_MSACCT) 1603 if ((p->p_flag & SMSACCT) == 0) 1604 estimate_msacct(p->p_tlist, gethrtime()); 1605 if (flags & PR_MSFORK) 1606 p->p_flag |= SMSFORK; 1607 if (flags & PR_PTRACE) { 1608 p->p_proc_flag |= P_PR_PTRACE; 1609 /* ptraced process must die if parent dead */ 1610 if (p->p_ppid == 1) 1611 sigtoproc(p, NULL, SIGKILL); 1612 } 1613 1614 return (0); 1615 } 1616 1617 int 1618 pr_unset(proc_t *p, long flags) 1619 { 1620 if ((p->p_flag & SSYS) || p->p_as == &kas) 1621 return (EBUSY); 1622 1623 if (flags & ~ALLFLAGS) 1624 return (EINVAL); 1625 1626 if (flags & PR_FORK) 1627 p->p_proc_flag &= ~P_PR_FORK; 1628 if (flags & PR_RLC) 1629 p->p_proc_flag &= ~P_PR_RUNLCL; 1630 if (flags & PR_KLC) 1631 p->p_proc_flag &= ~P_PR_KILLCL; 1632 if (flags & PR_ASYNC) 1633 p->p_proc_flag &= ~P_PR_ASYNC; 1634 if (flags & PR_BPTADJ) 1635 p->p_proc_flag &= ~P_PR_BPTADJ; 1636 if (flags & PR_MSACCT) 1637 disable_msacct(p); 1638 if (flags & PR_MSFORK) 1639 p->p_flag &= ~SMSFORK; 1640 if (flags & PR_PTRACE) 1641 p->p_proc_flag &= ~P_PR_PTRACE; 1642 1643 return (0); 1644 } 1645 1646 static int 1647 pr_setfpregs(prnode_t *pnp, prfpregset_t *prfpregset) 1648 { 1649 proc_t *p = pnp->pr_common->prc_proc; 1650 kthread_t *t = pr_thread(pnp); /* returns locked thread */ 1651 1652 if (!ISTOPPED(t) && !VSTOPPED(t) && !DSTOPPED(t)) { 1653 thread_unlock(t); 1654 return (EBUSY); 1655 } 1656 if (!prhasfp()) { 1657 thread_unlock(t); 1658 return (EINVAL); /* No FP support */ 1659 } 1660 1661 /* drop p_lock while touching the lwp's stack */ 1662 thread_unlock(t); 1663 mutex_exit(&p->p_lock); 1664 prsetprfpregs(ttolwp(t), prfpregset); 1665 mutex_enter(&p->p_lock); 1666 1667 return (0); 1668 } 1669 1670 #ifdef _SYSCALL32_IMPL 1671 static int 1672 pr_setfpregs32(prnode_t *pnp, prfpregset32_t *prfpregset) 1673 { 1674 proc_t *p = pnp->pr_common->prc_proc; 1675 kthread_t *t = pr_thread(pnp); /* returns locked thread */ 1676 1677 if (!ISTOPPED(t) && !VSTOPPED(t) && !DSTOPPED(t)) { 1678 thread_unlock(t); 1679 return (EBUSY); 1680 } 1681 if (!prhasfp()) { 1682 thread_unlock(t); 1683 return (EINVAL); /* No FP support */ 1684 } 1685 1686 /* drop p_lock while touching the lwp's stack */ 1687 thread_unlock(t); 1688 mutex_exit(&p->p_lock); 1689 prsetprfpregs32(ttolwp(t), prfpregset); 1690 mutex_enter(&p->p_lock); 1691 1692 return (0); 1693 } 1694 #endif /* _SYSCALL32_IMPL */ 1695 1696 #if defined(__sparc) 1697 /* ARGSUSED */ 1698 static int 1699 pr_setxregs(prnode_t *pnp, prxregset_t *prxregset) 1700 { 1701 proc_t *p = pnp->pr_common->prc_proc; 1702 kthread_t *t = pr_thread(pnp); /* returns locked thread */ 1703 1704 if (!ISTOPPED(t) && !VSTOPPED(t) && !DSTOPPED(t)) { 1705 thread_unlock(t); 1706 return (EBUSY); 1707 } 1708 thread_unlock(t); 1709 1710 if (!prhasx(p)) 1711 return (EINVAL); /* No extra register support */ 1712 1713 /* drop p_lock while touching the lwp's stack */ 1714 mutex_exit(&p->p_lock); 1715 prsetprxregs(ttolwp(t), (caddr_t)prxregset); 1716 mutex_enter(&p->p_lock); 1717 1718 return (0); 1719 } 1720 1721 static int 1722 pr_setasrs(prnode_t *pnp, asrset_t asrset) 1723 { 1724 proc_t *p = pnp->pr_common->prc_proc; 1725 kthread_t *t = pr_thread(pnp); /* returns locked thread */ 1726 1727 if (!ISTOPPED(t) && !VSTOPPED(t) && !DSTOPPED(t)) { 1728 thread_unlock(t); 1729 return (EBUSY); 1730 } 1731 thread_unlock(t); 1732 1733 /* drop p_lock while touching the lwp's stack */ 1734 mutex_exit(&p->p_lock); 1735 prsetasregs(ttolwp(t), asrset); 1736 mutex_enter(&p->p_lock); 1737 1738 return (0); 1739 } 1740 #endif 1741 1742 static int 1743 pr_setvaddr(prnode_t *pnp, caddr_t vaddr) 1744 { 1745 proc_t *p = pnp->pr_common->prc_proc; 1746 kthread_t *t = pr_thread(pnp); /* returns locked thread */ 1747 1748 if (!ISTOPPED(t) && !VSTOPPED(t) && !DSTOPPED(t)) { 1749 thread_unlock(t); 1750 return (EBUSY); 1751 } 1752 1753 /* drop p_lock while touching the lwp's stack */ 1754 thread_unlock(t); 1755 mutex_exit(&p->p_lock); 1756 prsvaddr(ttolwp(t), vaddr); 1757 mutex_enter(&p->p_lock); 1758 1759 return (0); 1760 } 1761 1762 void 1763 pr_sethold(prnode_t *pnp, sigset_t *sp) 1764 { 1765 proc_t *p = pnp->pr_common->prc_proc; 1766 kthread_t *t = pr_thread(pnp); /* returns locked thread */ 1767 1768 schedctl_finish_sigblock(t); 1769 sigutok(sp, &t->t_hold); 1770 if (ISWAKEABLE(t) && 1771 (fsig(&p->p_sig, t) || fsig(&t->t_sig, t))) 1772 setrun_locked(t); 1773 t->t_sig_check = 1; /* so thread will see new holdmask */ 1774 thread_unlock(t); 1775 } 1776 1777 void 1778 pr_setfault(proc_t *p, fltset_t *fltp) 1779 { 1780 prassignset(&p->p_fltmask, fltp); 1781 if (!prisempty(&p->p_fltmask)) 1782 p->p_proc_flag |= P_PR_TRACE; 1783 else if (sigisempty(&p->p_sigmask)) { 1784 user_t *up = PTOU(p); 1785 if (up->u_systrap == 0) 1786 p->p_proc_flag &= ~P_PR_TRACE; 1787 } 1788 } 1789 1790 static int 1791 pr_clearsig(prnode_t *pnp) 1792 { 1793 kthread_t *t = pr_thread(pnp); /* returns locked thread */ 1794 klwp_t *lwp = ttolwp(t); 1795 1796 thread_unlock(t); 1797 if (lwp->lwp_cursig == SIGKILL) 1798 return (EBUSY); 1799 1800 /* 1801 * Discard current siginfo_t, if any. 1802 */ 1803 lwp->lwp_cursig = 0; 1804 lwp->lwp_extsig = 0; 1805 if (lwp->lwp_curinfo) { 1806 siginfofree(lwp->lwp_curinfo); 1807 lwp->lwp_curinfo = NULL; 1808 } 1809 1810 return (0); 1811 } 1812 1813 static int 1814 pr_clearflt(prnode_t *pnp) 1815 { 1816 kthread_t *t = pr_thread(pnp); /* returns locked thread */ 1817 1818 thread_unlock(t); 1819 ttolwp(t)->lwp_curflt = 0; 1820 1821 return (0); 1822 } 1823 1824 static int 1825 pr_watch(prnode_t *pnp, prwatch_t *pwp, int *unlocked) 1826 { 1827 proc_t *p = pnp->pr_common->prc_proc; 1828 struct as *as = p->p_as; 1829 uintptr_t vaddr = pwp->pr_vaddr; 1830 size_t size = pwp->pr_size; 1831 int wflags = pwp->pr_wflags; 1832 ulong_t newpage = 0; 1833 struct watched_area *pwa; 1834 int error; 1835 1836 *unlocked = 0; 1837 1838 /* 1839 * Can't apply to a system process. 1840 */ 1841 if ((p->p_flag & SSYS) || p->p_as == &kas) 1842 return (EBUSY); 1843 1844 /* 1845 * Verify that the address range does not wrap 1846 * and that only the proper flags were specified. 1847 */ 1848 if ((wflags & ~WA_TRAPAFTER) == 0) 1849 size = 0; 1850 if (vaddr + size < vaddr || 1851 (wflags & ~(WA_READ|WA_WRITE|WA_EXEC|WA_TRAPAFTER)) != 0 || 1852 ((wflags & ~WA_TRAPAFTER) != 0 && size == 0)) 1853 return (EINVAL); 1854 1855 /* 1856 * Don't let the address range go above as->a_userlimit. 1857 * There is no error here, just a limitation. 1858 */ 1859 if (vaddr >= (uintptr_t)as->a_userlimit) 1860 return (0); 1861 if (vaddr + size > (uintptr_t)as->a_userlimit) 1862 size = (uintptr_t)as->a_userlimit - vaddr; 1863 1864 /* 1865 * Compute maximum number of pages this will add. 1866 */ 1867 if ((wflags & ~WA_TRAPAFTER) != 0) { 1868 ulong_t pagespan = (vaddr + size) - (vaddr & PAGEMASK); 1869 newpage = btopr(pagespan); 1870 if (newpage > 2 * prnwatch) 1871 return (E2BIG); 1872 } 1873 1874 /* 1875 * Force the process to be fully stopped. 1876 */ 1877 if (p == curproc) { 1878 prunlock(pnp); 1879 while (holdwatch() != 0) 1880 continue; 1881 if ((error = prlock(pnp, ZNO)) != 0) { 1882 continuelwps(p); 1883 *unlocked = 1; 1884 return (error); 1885 } 1886 } else { 1887 pauselwps(p); 1888 while (pr_allstopped(p, 0) > 0) { 1889 /* 1890 * This cv/mutex pair is persistent even 1891 * if the process disappears after we 1892 * unmark it and drop p->p_lock. 1893 */ 1894 kcondvar_t *cv = &pr_pid_cv[p->p_slot]; 1895 kmutex_t *mp = &p->p_lock; 1896 1897 prunmark(p); 1898 (void) cv_wait(cv, mp); 1899 mutex_exit(mp); 1900 if ((error = prlock(pnp, ZNO)) != 0) { 1901 /* 1902 * Unpause the process if it exists. 1903 */ 1904 p = pr_p_lock(pnp); 1905 mutex_exit(&pr_pidlock); 1906 if (p != NULL) { 1907 unpauselwps(p); 1908 prunlock(pnp); 1909 } 1910 *unlocked = 1; 1911 return (error); 1912 } 1913 } 1914 } 1915 1916 /* 1917 * Drop p->p_lock in order to perform the rest of this. 1918 * The process is still locked with the P_PR_LOCK flag. 1919 */ 1920 mutex_exit(&p->p_lock); 1921 1922 pwa = kmem_alloc(sizeof (struct watched_area), KM_SLEEP); 1923 pwa->wa_vaddr = (caddr_t)vaddr; 1924 pwa->wa_eaddr = (caddr_t)vaddr + size; 1925 pwa->wa_flags = (ulong_t)wflags; 1926 1927 error = ((pwa->wa_flags & ~WA_TRAPAFTER) == 0)? 1928 clear_watched_area(p, pwa) : set_watched_area(p, pwa); 1929 1930 if (p == curproc) { 1931 setallwatch(); 1932 mutex_enter(&p->p_lock); 1933 continuelwps(p); 1934 } else { 1935 mutex_enter(&p->p_lock); 1936 unpauselwps(p); 1937 } 1938 1939 return (error); 1940 } 1941 1942 /* jobcontrol stopped, but with a /proc directed stop in effect */ 1943 #define JDSTOPPED(t) \ 1944 ((t)->t_state == TS_STOPPED && \ 1945 (t)->t_whystop == PR_JOBCONTROL && \ 1946 ((t)->t_proc_flag & TP_PRSTOP)) 1947 1948 /* 1949 * pr_agent() creates the agent lwp. If the process is exiting while 1950 * we are creating an agent lwp, then exitlwps() waits until the 1951 * agent has been created using prbarrier(). 1952 */ 1953 static int 1954 pr_agent(prnode_t *pnp, prgregset_t prgregset, int *unlocked) 1955 { 1956 proc_t *p = pnp->pr_common->prc_proc; 1957 prcommon_t *pcp; 1958 kthread_t *t; 1959 kthread_t *ct; 1960 klwp_t *clwp; 1961 k_sigset_t smask; 1962 int cid; 1963 void *bufp = NULL; 1964 int error; 1965 1966 *unlocked = 0; 1967 1968 /* 1969 * Cannot create the /proc agent lwp if :- 1970 * - the process is not fully stopped or directed to stop. 1971 * - there is an agent lwp already. 1972 * - the process has been killed. 1973 * - the process is exiting. 1974 * - it's a vfork(2) parent. 1975 */ 1976 t = prchoose(p); /* returns locked thread */ 1977 ASSERT(t != NULL); 1978 1979 if ((!ISTOPPED(t) && !VSTOPPED(t) && !SUSPENDED(t) && !JDSTOPPED(t)) || 1980 p->p_agenttp != NULL || 1981 (p->p_flag & (SKILLED | SEXITING | SVFWAIT))) { 1982 thread_unlock(t); 1983 return (EBUSY); 1984 } 1985 1986 thread_unlock(t); 1987 mutex_exit(&p->p_lock); 1988 1989 sigfillset(&smask); 1990 sigdiffset(&smask, &cantmask); 1991 clwp = lwp_create(lwp_rtt, NULL, 0, p, TS_STOPPED, 1992 t->t_pri, &smask, NOCLASS, 0); 1993 if (clwp == NULL) { 1994 mutex_enter(&p->p_lock); 1995 return (ENOMEM); 1996 } 1997 prsetprregs(clwp, prgregset, 1); 1998 retry: 1999 cid = t->t_cid; 2000 (void) CL_ALLOC(&bufp, cid, KM_SLEEP); 2001 mutex_enter(&p->p_lock); 2002 if (cid != t->t_cid) { 2003 /* 2004 * Someone just changed this thread's scheduling class, 2005 * so try pre-allocating the buffer again. Hopefully we 2006 * don't hit this often. 2007 */ 2008 mutex_exit(&p->p_lock); 2009 CL_FREE(cid, bufp); 2010 goto retry; 2011 } 2012 2013 clwp->lwp_ap = clwp->lwp_arg; 2014 clwp->lwp_eosys = NORMALRETURN; 2015 ct = lwptot(clwp); 2016 ct->t_clfuncs = t->t_clfuncs; 2017 CL_FORK(t, ct, bufp); 2018 ct->t_cid = t->t_cid; 2019 ct->t_proc_flag |= TP_PRSTOP; 2020 /* 2021 * Setting t_sysnum to zero causes post_syscall() 2022 * to bypass all syscall checks and go directly to 2023 * if (issig()) psig(); 2024 * so that the agent lwp will stop in issig_forreal() 2025 * showing PR_REQUESTED. 2026 */ 2027 ct->t_sysnum = 0; 2028 ct->t_post_sys = 1; 2029 ct->t_sig_check = 1; 2030 p->p_agenttp = ct; 2031 ct->t_proc_flag &= ~TP_HOLDLWP; 2032 2033 pcp = pnp->pr_pcommon; 2034 mutex_enter(&pcp->prc_mutex); 2035 2036 lwp_create_done(ct); 2037 2038 /* 2039 * Don't return until the agent is stopped on PR_REQUESTED. 2040 */ 2041 2042 for (;;) { 2043 prunlock(pnp); 2044 *unlocked = 1; 2045 2046 /* 2047 * Wait for the agent to stop and notify us. 2048 * If we've been interrupted, return that information. 2049 */ 2050 error = pr_wait(pcp, NULL, 0); 2051 if (error == EINTR) { 2052 error = 0; 2053 break; 2054 } 2055 2056 /* 2057 * Confirm that the agent LWP has stopped. 2058 */ 2059 2060 if ((error = prlock(pnp, ZNO)) != 0) 2061 break; 2062 *unlocked = 0; 2063 2064 /* 2065 * Since we dropped the lock on the process, the agent 2066 * may have disappeared or changed. Grab the current 2067 * agent and check fail if it has disappeared. 2068 */ 2069 if ((ct = p->p_agenttp) == NULL) { 2070 error = ENOENT; 2071 break; 2072 } 2073 2074 mutex_enter(&pcp->prc_mutex); 2075 thread_lock(ct); 2076 2077 if (ISTOPPED(ct)) { 2078 thread_unlock(ct); 2079 mutex_exit(&pcp->prc_mutex); 2080 break; 2081 } 2082 2083 thread_unlock(ct); 2084 } 2085 2086 return (error ? error : -1); 2087 } 2088 2089 static int 2090 pr_rdwr(proc_t *p, enum uio_rw rw, priovec_t *pio) 2091 { 2092 caddr_t base = (caddr_t)pio->pio_base; 2093 size_t cnt = pio->pio_len; 2094 uintptr_t offset = (uintptr_t)pio->pio_offset; 2095 struct uio auio; 2096 struct iovec aiov; 2097 int error = 0; 2098 2099 if ((p->p_flag & SSYS) || p->p_as == &kas) 2100 error = EIO; 2101 else if ((base + cnt) < base || (offset + cnt) < offset) 2102 error = EINVAL; 2103 else if (cnt != 0) { 2104 aiov.iov_base = base; 2105 aiov.iov_len = cnt; 2106 2107 auio.uio_loffset = offset; 2108 auio.uio_iov = &aiov; 2109 auio.uio_iovcnt = 1; 2110 auio.uio_resid = cnt; 2111 auio.uio_segflg = UIO_USERSPACE; 2112 auio.uio_llimit = (longlong_t)MAXOFFSET_T; 2113 auio.uio_fmode = FREAD|FWRITE; 2114 auio.uio_extflg = UIO_COPY_DEFAULT; 2115 2116 mutex_exit(&p->p_lock); 2117 error = prusrio(p, rw, &auio, 0); 2118 mutex_enter(&p->p_lock); 2119 2120 /* 2121 * We have no way to return the i/o count, 2122 * like read() or write() would do, so we 2123 * return an error if the i/o was truncated. 2124 */ 2125 if (auio.uio_resid != 0 && error == 0) 2126 error = EIO; 2127 } 2128 2129 return (error); 2130 } 2131 2132 static int 2133 pr_scred(proc_t *p, prcred_t *prcred, cred_t *cr, boolean_t dogrps) 2134 { 2135 kthread_t *t; 2136 cred_t *oldcred; 2137 cred_t *newcred; 2138 uid_t oldruid; 2139 int error; 2140 zone_t *zone = crgetzone(cr); 2141 2142 if (!VALID_UID(prcred->pr_euid, zone) || 2143 !VALID_UID(prcred->pr_ruid, zone) || 2144 !VALID_UID(prcred->pr_suid, zone) || 2145 !VALID_GID(prcred->pr_egid, zone) || 2146 !VALID_GID(prcred->pr_rgid, zone) || 2147 !VALID_GID(prcred->pr_sgid, zone)) 2148 return (EINVAL); 2149 2150 if (dogrps) { 2151 int ngrp = prcred->pr_ngroups; 2152 int i; 2153 2154 if (ngrp < 0 || ngrp > ngroups_max) 2155 return (EINVAL); 2156 2157 for (i = 0; i < ngrp; i++) { 2158 if (!VALID_GID(prcred->pr_groups[i], zone)) 2159 return (EINVAL); 2160 } 2161 } 2162 2163 error = secpolicy_allow_setid(cr, prcred->pr_euid, B_FALSE); 2164 2165 if (error == 0 && prcred->pr_ruid != prcred->pr_euid) 2166 error = secpolicy_allow_setid(cr, prcred->pr_ruid, B_FALSE); 2167 2168 if (error == 0 && prcred->pr_suid != prcred->pr_euid && 2169 prcred->pr_suid != prcred->pr_ruid) 2170 error = secpolicy_allow_setid(cr, prcred->pr_suid, B_FALSE); 2171 2172 if (error) 2173 return (error); 2174 2175 mutex_exit(&p->p_lock); 2176 2177 /* hold old cred so it doesn't disappear while we dup it */ 2178 mutex_enter(&p->p_crlock); 2179 crhold(oldcred = p->p_cred); 2180 mutex_exit(&p->p_crlock); 2181 newcred = crdup(oldcred); 2182 oldruid = crgetruid(oldcred); 2183 crfree(oldcred); 2184 2185 /* Error checking done above */ 2186 (void) crsetresuid(newcred, prcred->pr_ruid, prcred->pr_euid, 2187 prcred->pr_suid); 2188 (void) crsetresgid(newcred, prcred->pr_rgid, prcred->pr_egid, 2189 prcred->pr_sgid); 2190 2191 if (dogrps) { 2192 (void) crsetgroups(newcred, prcred->pr_ngroups, 2193 prcred->pr_groups); 2194 2195 } 2196 2197 mutex_enter(&p->p_crlock); 2198 oldcred = p->p_cred; 2199 p->p_cred = newcred; 2200 mutex_exit(&p->p_crlock); 2201 crfree(oldcred); 2202 2203 /* 2204 * Keep count of processes per uid consistent. 2205 */ 2206 if (oldruid != prcred->pr_ruid) { 2207 zoneid_t zoneid = crgetzoneid(newcred); 2208 2209 mutex_enter(&pidlock); 2210 upcount_dec(oldruid, zoneid); 2211 upcount_inc(prcred->pr_ruid, zoneid); 2212 mutex_exit(&pidlock); 2213 } 2214 2215 /* 2216 * Broadcast the cred change to the threads. 2217 */ 2218 mutex_enter(&p->p_lock); 2219 t = p->p_tlist; 2220 do { 2221 t->t_pre_sys = 1; /* so syscall will get new cred */ 2222 } while ((t = t->t_forw) != p->p_tlist); 2223 2224 return (0); 2225 } 2226 2227 /* 2228 * Change process credentials to specified zone. Used to temporarily 2229 * set a process to run in the global zone; only transitions between 2230 * the process's actual zone and the global zone are allowed. 2231 */ 2232 static int 2233 pr_szoneid(proc_t *p, zoneid_t zoneid, cred_t *cr) 2234 { 2235 kthread_t *t; 2236 cred_t *oldcred; 2237 cred_t *newcred; 2238 zone_t *zptr; 2239 zoneid_t oldzoneid; 2240 2241 if (secpolicy_zone_config(cr) != 0) 2242 return (EPERM); 2243 if (zoneid != GLOBAL_ZONEID && zoneid != p->p_zone->zone_id) 2244 return (EINVAL); 2245 if ((zptr = zone_find_by_id(zoneid)) == NULL) 2246 return (EINVAL); 2247 mutex_exit(&p->p_lock); 2248 mutex_enter(&p->p_crlock); 2249 oldcred = p->p_cred; 2250 crhold(oldcred); 2251 mutex_exit(&p->p_crlock); 2252 newcred = crdup(oldcred); 2253 oldzoneid = crgetzoneid(oldcred); 2254 crfree(oldcred); 2255 2256 crsetzone(newcred, zptr); 2257 zone_rele(zptr); 2258 2259 mutex_enter(&p->p_crlock); 2260 oldcred = p->p_cred; 2261 p->p_cred = newcred; 2262 mutex_exit(&p->p_crlock); 2263 crfree(oldcred); 2264 2265 /* 2266 * The target process is changing zones (according to its cred), so 2267 * update the per-zone upcounts, which are based on process creds. 2268 */ 2269 if (oldzoneid != zoneid) { 2270 uid_t ruid = crgetruid(newcred); 2271 2272 mutex_enter(&pidlock); 2273 upcount_dec(ruid, oldzoneid); 2274 upcount_inc(ruid, zoneid); 2275 mutex_exit(&pidlock); 2276 } 2277 /* 2278 * Broadcast the cred change to the threads. 2279 */ 2280 mutex_enter(&p->p_lock); 2281 t = p->p_tlist; 2282 do { 2283 t->t_pre_sys = 1; /* so syscall will get new cred */ 2284 } while ((t = t->t_forw) != p->p_tlist); 2285 2286 return (0); 2287 } 2288 2289 static int 2290 pr_spriv(proc_t *p, prpriv_t *prpriv, cred_t *cr) 2291 { 2292 kthread_t *t; 2293 int err; 2294 2295 ASSERT(MUTEX_HELD(&p->p_lock)); 2296 2297 if ((err = priv_pr_spriv(p, prpriv, cr)) == 0) { 2298 /* 2299 * Broadcast the cred change to the threads. 2300 */ 2301 t = p->p_tlist; 2302 do { 2303 t->t_pre_sys = 1; /* so syscall will get new cred */ 2304 } while ((t = t->t_forw) != p->p_tlist); 2305 } 2306 2307 return (err); 2308 } 2309 2310 /* 2311 * Return -1 if the process is the parent of a vfork(1) whose child has yet to 2312 * terminate or perform an exec(2). 2313 * 2314 * Returns 0 if the process is fully stopped except for the current thread (if 2315 * we are operating on our own process), 1 otherwise. 2316 * 2317 * If the watchstop flag is set, then we ignore threads with TP_WATCHSTOP set. 2318 * See holdwatch() for details. 2319 */ 2320 int 2321 pr_allstopped(proc_t *p, int watchstop) 2322 { 2323 kthread_t *t; 2324 int rv = 0; 2325 2326 ASSERT(MUTEX_HELD(&p->p_lock)); 2327 2328 if (p->p_flag & SVFWAIT) /* waiting for vfork'd child to exec */ 2329 return (-1); 2330 2331 if ((t = p->p_tlist) != NULL) { 2332 do { 2333 if (t == curthread || VSTOPPED(t) || 2334 (watchstop && (t->t_proc_flag & TP_WATCHSTOP))) 2335 continue; 2336 thread_lock(t); 2337 switch (t->t_state) { 2338 case TS_ZOMB: 2339 case TS_STOPPED: 2340 break; 2341 case TS_SLEEP: 2342 if (!(t->t_flag & T_WAKEABLE) || 2343 t->t_wchan0 == NULL) 2344 rv = 1; 2345 break; 2346 default: 2347 rv = 1; 2348 break; 2349 } 2350 thread_unlock(t); 2351 } while (rv == 0 && (t = t->t_forw) != p->p_tlist); 2352 } 2353 2354 return (rv); 2355 } 2356 2357 /* 2358 * Cause all lwps in the process to pause (for watchpoint operations). 2359 */ 2360 static void 2361 pauselwps(proc_t *p) 2362 { 2363 kthread_t *t; 2364 2365 ASSERT(MUTEX_HELD(&p->p_lock)); 2366 ASSERT(p != curproc); 2367 2368 if ((t = p->p_tlist) != NULL) { 2369 do { 2370 thread_lock(t); 2371 t->t_proc_flag |= TP_PAUSE; 2372 aston(t); 2373 if ((ISWAKEABLE(t) && (t->t_wchan0 == NULL)) || 2374 ISWAITING(t)) { 2375 setrun_locked(t); 2376 } 2377 prpokethread(t); 2378 thread_unlock(t); 2379 } while ((t = t->t_forw) != p->p_tlist); 2380 } 2381 } 2382 2383 /* 2384 * undo the effects of pauselwps() 2385 */ 2386 static void 2387 unpauselwps(proc_t *p) 2388 { 2389 kthread_t *t; 2390 2391 ASSERT(MUTEX_HELD(&p->p_lock)); 2392 ASSERT(p != curproc); 2393 2394 if ((t = p->p_tlist) != NULL) { 2395 do { 2396 thread_lock(t); 2397 t->t_proc_flag &= ~TP_PAUSE; 2398 if (t->t_state == TS_STOPPED) { 2399 t->t_schedflag |= TS_UNPAUSE; 2400 t->t_dtrace_stop = 0; 2401 setrun_locked(t); 2402 } 2403 thread_unlock(t); 2404 } while ((t = t->t_forw) != p->p_tlist); 2405 } 2406 } 2407 2408 /* 2409 * Cancel all watched areas. Called from prclose(). 2410 */ 2411 proc_t * 2412 pr_cancel_watch(prnode_t *pnp) 2413 { 2414 proc_t *p = pnp->pr_pcommon->prc_proc; 2415 struct as *as; 2416 kthread_t *t; 2417 2418 ASSERT(MUTEX_HELD(&p->p_lock) && (p->p_proc_flag & P_PR_LOCK)); 2419 2420 if (!pr_watch_active(p)) 2421 return (p); 2422 2423 /* 2424 * Pause the process before dealing with the watchpoints. 2425 */ 2426 if (p == curproc) { 2427 prunlock(pnp); 2428 while (holdwatch() != 0) 2429 continue; 2430 p = pr_p_lock(pnp); 2431 mutex_exit(&pr_pidlock); 2432 ASSERT(p == curproc); 2433 } else { 2434 pauselwps(p); 2435 while (p != NULL && pr_allstopped(p, 0) > 0) { 2436 /* 2437 * This cv/mutex pair is persistent even 2438 * if the process disappears after we 2439 * unmark it and drop p->p_lock. 2440 */ 2441 kcondvar_t *cv = &pr_pid_cv[p->p_slot]; 2442 kmutex_t *mp = &p->p_lock; 2443 2444 prunmark(p); 2445 (void) cv_wait(cv, mp); 2446 mutex_exit(mp); 2447 p = pr_p_lock(pnp); /* NULL if process disappeared */ 2448 mutex_exit(&pr_pidlock); 2449 } 2450 } 2451 2452 if (p == NULL) /* the process disappeared */ 2453 return (NULL); 2454 2455 ASSERT(p == pnp->pr_pcommon->prc_proc); 2456 ASSERT(MUTEX_HELD(&p->p_lock) && (p->p_proc_flag & P_PR_LOCK)); 2457 2458 if (pr_watch_active(p)) { 2459 pr_free_watchpoints(p); 2460 if ((t = p->p_tlist) != NULL) { 2461 do { 2462 watch_disable(t); 2463 2464 } while ((t = t->t_forw) != p->p_tlist); 2465 } 2466 } 2467 2468 if ((as = p->p_as) != NULL) { 2469 avl_tree_t *tree; 2470 struct watched_page *pwp; 2471 2472 /* 2473 * If this is the parent of a vfork, the watched page 2474 * list has been moved temporarily to p->p_wpage. 2475 */ 2476 if (avl_numnodes(&p->p_wpage) != 0) 2477 tree = &p->p_wpage; 2478 else 2479 tree = &as->a_wpage; 2480 2481 mutex_exit(&p->p_lock); 2482 AS_LOCK_ENTER(as, &as->a_lock, RW_WRITER); 2483 2484 for (pwp = avl_first(tree); pwp != NULL; 2485 pwp = AVL_NEXT(tree, pwp)) { 2486 pwp->wp_read = 0; 2487 pwp->wp_write = 0; 2488 pwp->wp_exec = 0; 2489 if ((pwp->wp_flags & WP_SETPROT) == 0) { 2490 pwp->wp_flags |= WP_SETPROT; 2491 pwp->wp_prot = pwp->wp_oprot; 2492 pwp->wp_list = p->p_wprot; 2493 p->p_wprot = pwp; 2494 } 2495 } 2496 2497 AS_LOCK_EXIT(as, &as->a_lock); 2498 mutex_enter(&p->p_lock); 2499 } 2500 2501 /* 2502 * Unpause the process now. 2503 */ 2504 if (p == curproc) 2505 continuelwps(p); 2506 else 2507 unpauselwps(p); 2508 2509 return (p); 2510 } 2511
Indexes created Mon Nov 23 07:06:21 UTC 2009
Terms of Use |
Privacy |
Trademarks |
Copyright Policy |
Site Guidelines |
Help
Your use of this web site or any of its content or software indicates your agreement to be bound by these Terms of Use.
Copyright © 1995-2008 Sun Microsystems, Inc.