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 2010 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #include <sys/types.h> 28 #include <sys/uio.h> 29 #include <sys/param.h> 30 #include <sys/cmn_err.h> 31 #include <sys/cred.h> 32 #include <sys/policy.h> 33 #include <sys/debug.h> 34 #include <sys/errno.h> 35 #include <sys/file.h> 36 #include <sys/inline.h> 37 #include <sys/kmem.h> 38 #include <sys/proc.h> 39 #include <sys/brand.h> 40 #include <sys/regset.h> 41 #include <sys/sysmacros.h> 42 #include <sys/systm.h> 43 #include <sys/vfs.h> 44 #include <sys/vnode.h> 45 #include <sys/signal.h> 46 #include <sys/auxv.h> 47 #include <sys/user.h> 48 #include <sys/class.h> 49 #include <sys/fault.h> 50 #include <sys/syscall.h> 51 #include <sys/procfs.h> 52 #include <sys/zone.h> 53 #include <sys/copyops.h> 54 #include <sys/schedctl.h> 55 #include <vm/as.h> 56 #include <vm/seg.h> 57 #include <fs/proc/prdata.h> 58 #include <sys/contract/process_impl.h> 59 60 static void pr_settrace(proc_t *, sigset_t *); 61 static int pr_setfpregs(prnode_t *, prfpregset_t *); 62 #if defined(__sparc) 63 static int pr_setxregs(prnode_t *, prxregset_t *); 64 static int pr_setasrs(prnode_t *, asrset_t); 65 #endif 66 static int pr_setvaddr(prnode_t *, caddr_t); 67 static int pr_clearsig(prnode_t *); 68 static int pr_clearflt(prnode_t *); 69 static int pr_watch(prnode_t *, prwatch_t *, int *); 70 static int pr_agent(prnode_t *, prgregset_t, int *); 71 static int pr_rdwr(proc_t *, enum uio_rw, priovec_t *); 72 static int pr_scred(proc_t *, prcred_t *, cred_t *, boolean_t); 73 static int pr_spriv(proc_t *, prpriv_t *, cred_t *); 74 static int pr_szoneid(proc_t *, zoneid_t, cred_t *); 75 static void pauselwps(proc_t *); 76 static void unpauselwps(proc_t *); 77 78 typedef union { 79 long sig; /* PCKILL, PCUNKILL */ 80 long nice; /* PCNICE */ 81 long timeo; /* PCTWSTOP */ 82 ulong_t flags; /* PCRUN, PCSET, PCUNSET */ 83 caddr_t vaddr; /* PCSVADDR */ 84 siginfo_t siginfo; /* PCSSIG */ 85 sigset_t sigset; /* PCSTRACE, PCSHOLD */ 86 fltset_t fltset; /* PCSFAULT */ 87 sysset_t sysset; /* PCSENTRY, PCSEXIT */ 88 prgregset_t prgregset; /* PCSREG, PCAGENT */ 89 prfpregset_t prfpregset; /* PCSFPREG */ 90 #if defined(__sparc) 91 prxregset_t prxregset; /* PCSXREG */ 92 asrset_t asrset; /* PCSASRS */ 93 #endif 94 prwatch_t prwatch; /* PCWATCH */ 95 priovec_t priovec; /* PCREAD, PCWRITE */ 96 prcred_t prcred; /* PCSCRED */ 97 prpriv_t prpriv; /* PCSPRIV */ 98 long przoneid; /* PCSZONE */ 99 } arg_t; 100 101 static int pr_control(long, arg_t *, prnode_t *, cred_t *); 102 103 static size_t 104 ctlsize(long cmd, size_t resid, arg_t *argp) 105 { 106 size_t size = sizeof (long); 107 size_t rnd; 108 int ngrp; 109 110 switch (cmd) { 111 case PCNULL: 112 case PCSTOP: 113 case PCDSTOP: 114 case PCWSTOP: 115 case PCCSIG: 116 case PCCFAULT: 117 break; 118 case PCSSIG: 119 size += sizeof (siginfo_t); 120 break; 121 case PCTWSTOP: 122 size += sizeof (long); 123 break; 124 case PCKILL: 125 case PCUNKILL: 126 case PCNICE: 127 size += sizeof (long); 128 break; 129 case PCRUN: 130 case PCSET: 131 case PCUNSET: 132 size += sizeof (ulong_t); 133 break; 134 case PCSVADDR: 135 size += sizeof (caddr_t); 136 break; 137 case PCSTRACE: 138 case PCSHOLD: 139 size += sizeof (sigset_t); 140 break; 141 case PCSFAULT: 142 size += sizeof (fltset_t); 143 break; 144 case PCSENTRY: 145 case PCSEXIT: 146 size += sizeof (sysset_t); 147 break; 148 case PCSREG: 149 case PCAGENT: 150 size += sizeof (prgregset_t); 151 break; 152 case PCSFPREG: 153 size += sizeof (prfpregset_t); 154 break; 155 #if defined(__sparc) 156 case PCSXREG: 157 size += sizeof (prxregset_t); 158 break; 159 case PCSASRS: 160 size += sizeof (asrset_t); 161 break; 162 #endif 163 case PCWATCH: 164 size += sizeof (prwatch_t); 165 break; 166 case PCREAD: 167 case PCWRITE: 168 size += sizeof (priovec_t); 169 break; 170 case PCSCRED: 171 size += sizeof (prcred_t); 172 break; 173 case PCSCREDX: 174 /* 175 * We cannot derefence the pr_ngroups fields if it 176 * we don't have enough data. 177 */ 178 if (resid < size + sizeof (prcred_t) - sizeof (gid_t)) 179 return (0); 180 ngrp = argp->prcred.pr_ngroups; 181 if (ngrp < 0 || ngrp > ngroups_max) 182 return (0); 183 184 /* The result can be smaller than sizeof (prcred_t) */ 185 size += sizeof (prcred_t) - sizeof (gid_t); 186 size += ngrp * sizeof (gid_t); 187 break; 188 case PCSPRIV: 189 if (resid >= size + sizeof (prpriv_t)) 190 size += priv_prgetprivsize(&argp->prpriv); 191 else 192 return (0); 193 break; 194 case PCSZONE: 195 size += sizeof (long); 196 break; 197 default: 198 return (0); 199 } 200 201 /* Round up to a multiple of long, unless exact amount written */ 202 if (size < resid) { 203 rnd = size & (sizeof (long) - 1); 204 205 if (rnd != 0) 206 size += sizeof (long) - rnd; 207 } 208 209 if (size > resid) 210 return (0); 211 return (size); 212 } 213 214 /* 215 * Control operations (lots). 216 */ 217 int 218 prwritectl(vnode_t *vp, uio_t *uiop, cred_t *cr) 219 { 220 #define MY_BUFFER_SIZE \ 221 100 > 1 + sizeof (arg_t) / sizeof (long) ? \ 222 100 : 1 + sizeof (arg_t) / sizeof (long) 223 long buf[MY_BUFFER_SIZE]; 224 long *bufp; 225 size_t resid = 0; 226 size_t size; 227 prnode_t *pnp = VTOP(vp); 228 int error; 229 int locked = 0; 230 231 while (uiop->uio_resid) { 232 /* 233 * Read several commands in one gulp. 234 */ 235 bufp = buf; 236 if (resid) { /* move incomplete command to front of buffer */ 237 long *tail; 238 239 if (resid >= sizeof (buf)) 240 break; 241 tail = (long *)((char *)buf + sizeof (buf) - resid); 242 do { 243 *bufp++ = *tail++; 244 } while ((resid -= sizeof (long)) != 0); 245 } 246 resid = sizeof (buf) - ((char *)bufp - (char *)buf); 247 if (resid > uiop->uio_resid) 248 resid = uiop->uio_resid; 249 if (error = uiomove((caddr_t)bufp, resid, UIO_WRITE, uiop)) 250 return (error); 251 resid += (char *)bufp - (char *)buf; 252 bufp = buf; 253 254 do { /* loop over commands in buffer */ 255 long cmd = bufp[0]; 256 arg_t *argp = (arg_t *)&bufp[1]; 257 258 size = ctlsize(cmd, resid, argp); 259 if (size == 0) /* incomplete or invalid command */ 260 break; 261 /* 262 * Perform the specified control operation. 263 */ 264 if (!locked) { 265 if ((error = prlock(pnp, ZNO)) != 0) 266 return (error); 267 locked = 1; 268 } 269 if (error = pr_control(cmd, argp, pnp, cr)) { 270 if (error == -1) /* -1 is timeout */ 271 locked = 0; 272 else 273 return (error); 274 } 275 bufp = (long *)((char *)bufp + size); 276 } while ((resid -= size) != 0); 277 278 if (locked) { 279 prunlock(pnp); 280 locked = 0; 281 } 282 } 283 return (resid? EINVAL : 0); 284 } 285 286 static int 287 pr_control(long cmd, arg_t *argp, prnode_t *pnp, cred_t *cr) 288 { 289 prcommon_t *pcp; 290 proc_t *p; 291 int unlocked; 292 int error = 0; 293 294 if (cmd == PCNULL) 295 return (0); 296 297 pcp = pnp->pr_common; 298 p = pcp->prc_proc; 299 ASSERT(p != NULL); 300 301 /* System processes defy control. */ 302 if (p->p_flag & SSYS) { 303 prunlock(pnp); 304 return (EBUSY); 305 } 306 307 switch (cmd) { 308 309 default: 310 error = EINVAL; 311 break; 312 313 case PCSTOP: /* direct process or lwp to stop and wait for stop */ 314 case PCDSTOP: /* direct process or lwp to stop, don't wait */ 315 case PCWSTOP: /* wait for process or lwp to stop */ 316 case PCTWSTOP: /* wait for process or lwp to stop, with timeout */ 317 { 318 time_t timeo; 319 320 /* 321 * Can't apply to a system process. 322 */ 323 if (p->p_as == &kas) { 324 error = EBUSY; 325 break; 326 } 327 328 if (cmd == PCSTOP || cmd == PCDSTOP) 329 pr_stop(pnp); 330 331 if (cmd == PCDSTOP) 332 break; 333 334 /* 335 * If an lwp is waiting for itself or its process, 336 * don't wait. The stopped lwp would never see the 337 * fact that it is stopped. 338 */ 339 if ((pcp->prc_flags & PRC_LWP)? 340 (pcp->prc_thread == curthread) : (p == curproc)) { 341 if (cmd == PCWSTOP || cmd == PCTWSTOP) 342 error = EBUSY; 343 break; 344 } 345 346 timeo = (cmd == PCTWSTOP)? (time_t)argp->timeo : 0; 347 if ((error = pr_wait_stop(pnp, timeo)) != 0) 348 return (error); 349 350 break; 351 } 352 353 case PCRUN: /* make lwp or process runnable */ 354 error = pr_setrun(pnp, argp->flags); 355 break; 356 357 case PCSTRACE: /* set signal trace mask */ 358 pr_settrace(p, &argp->sigset); 359 break; 360 361 case PCSSIG: /* set current signal */ 362 error = pr_setsig(pnp, &argp->siginfo); 363 if (argp->siginfo.si_signo == SIGKILL && error == 0) { 364 prunlock(pnp); 365 pr_wait_die(pnp); 366 return (-1); 367 } 368 break; 369 370 case PCKILL: /* send signal */ 371 error = pr_kill(pnp, (int)argp->sig, cr); 372 if (error == 0 && argp->sig == SIGKILL) { 373 prunlock(pnp); 374 pr_wait_die(pnp); 375 return (-1); 376 } 377 break; 378 379 case PCUNKILL: /* delete a pending signal */ 380 error = pr_unkill(pnp, (int)argp->sig); 381 break; 382 383 case PCNICE: /* set nice priority */ 384 error = pr_nice(p, (int)argp->nice, cr); 385 break; 386 387 case PCSENTRY: /* set syscall entry bit mask */ 388 case PCSEXIT: /* set syscall exit bit mask */ 389 pr_setentryexit(p, &argp->sysset, cmd == PCSENTRY); 390 break; 391 392 case PCSET: /* set process flags */ 393 error = pr_set(p, argp->flags); 394 break; 395 396 case PCUNSET: /* unset process flags */ 397 error = pr_unset(p, argp->flags); 398 break; 399 400 case PCSREG: /* set general registers */ 401 { 402 kthread_t *t = pr_thread(pnp); 403 404 if (!ISTOPPED(t) && !VSTOPPED(t) && !DSTOPPED(t)) { 405 thread_unlock(t); 406 error = EBUSY; 407 } else { 408 thread_unlock(t); 409 mutex_exit(&p->p_lock); 410 prsetprregs(ttolwp(t), argp->prgregset, 0); 411 mutex_enter(&p->p_lock); 412 } 413 break; 414 } 415 416 case PCSFPREG: /* set floating-point registers */ 417 error = pr_setfpregs(pnp, &argp->prfpregset); 418 break; 419 420 case PCSXREG: /* set extra registers */ 421 #if defined(__sparc) 422 error = pr_setxregs(pnp, &argp->prxregset); 423 #else 424 error = EINVAL; 425 #endif 426 break; 427 428 #if defined(__sparc) 429 case PCSASRS: /* set ancillary state registers */ 430 error = pr_setasrs(pnp, argp->asrset); 431 break; 432 #endif 433 434 case PCSVADDR: /* set virtual address at which to resume */ 435 error = pr_setvaddr(pnp, argp->vaddr); 436 break; 437 438 case PCSHOLD: /* set signal-hold mask */ 439 pr_sethold(pnp, &argp->sigset); 440 break; 441 442 case PCSFAULT: /* set mask of traced faults */ 443 pr_setfault(p, &argp->fltset); 444 break; 445 446 case PCCSIG: /* clear current signal */ 447 error = pr_clearsig(pnp); 448 break; 449 450 case PCCFAULT: /* clear current fault */ 451 error = pr_clearflt(pnp); 452 break; 453 454 case PCWATCH: /* set or clear watched areas */ 455 error = pr_watch(pnp, &argp->prwatch, &unlocked); 456 if (error && unlocked) 457 return (error); 458 break; 459 460 case PCAGENT: /* create the /proc agent lwp in the target process */ 461 error = pr_agent(pnp, argp->prgregset, &unlocked); 462 if (error && unlocked) 463 return (error); 464 break; 465 466 case PCREAD: /* read from the address space */ 467 error = pr_rdwr(p, UIO_READ, &argp->priovec); 468 break; 469 470 case PCWRITE: /* write to the address space */ 471 error = pr_rdwr(p, UIO_WRITE, &argp->priovec); 472 break; 473 474 case PCSCRED: /* set the process credentials */ 475 case PCSCREDX: 476 error = pr_scred(p, &argp->prcred, cr, cmd == PCSCREDX); 477 break; 478 479 case PCSPRIV: /* set the process privileges */ 480 error = pr_spriv(p, &argp->prpriv, cr); 481 break; 482 case PCSZONE: /* set the process's zoneid credentials */ 483 error = pr_szoneid(p, (zoneid_t)argp->przoneid, cr); 484 break; 485 } 486 487 if (error) 488 prunlock(pnp); 489 return (error); 490 } 491 492 #ifdef _SYSCALL32_IMPL 493 494 typedef union { 495 int32_t sig; /* PCKILL, PCUNKILL */ 496 int32_t nice; /* PCNICE */ 497 int32_t timeo; /* PCTWSTOP */ 498 uint32_t flags; /* PCRUN, PCSET, PCUNSET */ 499 caddr32_t vaddr; /* PCSVADDR */ 500 siginfo32_t siginfo; /* PCSSIG */ 501 sigset_t sigset; /* PCSTRACE, PCSHOLD */ 502 fltset_t fltset; /* PCSFAULT */ 503 sysset_t sysset; /* PCSENTRY, PCSEXIT */ 504 prgregset32_t prgregset; /* PCSREG, PCAGENT */ 505 prfpregset32_t prfpregset; /* PCSFPREG */ 506 #if defined(__sparc) 507 prxregset_t prxregset; /* PCSXREG */ 508 #endif 509 prwatch32_t prwatch; /* PCWATCH */ 510 priovec32_t priovec; /* PCREAD, PCWRITE */ 511 prcred32_t prcred; /* PCSCRED */ 512 prpriv_t prpriv; /* PCSPRIV */ 513 int32_t przoneid; /* PCSZONE */ 514 } arg32_t; 515 516 static int pr_control32(int32_t, arg32_t *, prnode_t *, cred_t *); 517 static int pr_setfpregs32(prnode_t *, prfpregset32_t *); 518 519 /* 520 * Note that while ctlsize32() can use argp, it must do so only in a way 521 * that assumes 32-bit rather than 64-bit alignment as argp is a pointer 522 * to an array of 32-bit values and only 32-bit alignment is ensured. 523 */ 524 static size_t 525 ctlsize32(int32_t cmd, size_t resid, arg32_t *argp) 526 { 527 size_t size = sizeof (int32_t); 528 size_t rnd; 529 int ngrp; 530 531 switch (cmd) { 532 case PCNULL: 533 case PCSTOP: 534 case PCDSTOP: 535 case PCWSTOP: 536 case PCCSIG: 537 case PCCFAULT: 538 break; 539 case PCSSIG: 540 size += sizeof (siginfo32_t); 541 break; 542 case PCTWSTOP: 543 size += sizeof (int32_t); 544 break; 545 case PCKILL: 546 case PCUNKILL: 547 case PCNICE: 548 size += sizeof (int32_t); 549 break; 550 case PCRUN: 551 case PCSET: 552 case PCUNSET: 553 size += sizeof (uint32_t); 554 break; 555 case PCSVADDR: 556 size += sizeof (caddr32_t); 557 break; 558 case PCSTRACE: 559 case PCSHOLD: 560 size += sizeof (sigset_t); 561 break; 562 case PCSFAULT: 563 size += sizeof (fltset_t); 564 break; 565 case PCSENTRY: 566 case PCSEXIT: 567 size += sizeof (sysset_t); 568 break; 569 case PCSREG: 570 case PCAGENT: 571 size += sizeof (prgregset32_t); 572 break; 573 case PCSFPREG: 574 size += sizeof (prfpregset32_t); 575 break; 576 #if defined(__sparc) 577 case PCSXREG: 578 size += sizeof (prxregset_t); 579 break; 580 #endif 581 case PCWATCH: 582 size += sizeof (prwatch32_t); 583 break; 584 case PCREAD: 585 case PCWRITE: 586 size += sizeof (priovec32_t); 587 break; 588 case PCSCRED: 589 size += sizeof (prcred32_t); 590 break; 591 case PCSCREDX: 592 /* 593 * We cannot derefence the pr_ngroups fields if it 594 * we don't have enough data. 595 */ 596 if (resid < size + sizeof (prcred32_t) - sizeof (gid32_t)) 597 return (0); 598 ngrp = argp->prcred.pr_ngroups; 599 if (ngrp < 0 || ngrp > ngroups_max) 600 return (0); 601 602 /* The result can be smaller than sizeof (prcred32_t) */ 603 size += sizeof (prcred32_t) - sizeof (gid32_t); 604 size += ngrp * sizeof (gid32_t); 605 break; 606 case PCSPRIV: 607 if (resid >= size + sizeof (prpriv_t)) 608 size += priv_prgetprivsize(&argp->prpriv); 609 else 610 return (0); 611 break; 612 case PCSZONE: 613 size += sizeof (int32_t); 614 break; 615 default: 616 return (0); 617 } 618 619 /* Round up to a multiple of int32_t */ 620 rnd = size & (sizeof (int32_t) - 1); 621 622 if (rnd != 0) 623 size += sizeof (int32_t) - rnd; 624 625 if (size > resid) 626 return (0); 627 return (size); 628 } 629 630 /* 631 * Control operations (lots). 632 */ 633 int 634 prwritectl32(struct vnode *vp, struct uio *uiop, cred_t *cr) 635 { 636 #define MY_BUFFER_SIZE32 \ 637 100 > 1 + sizeof (arg32_t) / sizeof (int32_t) ? \ 638 100 : 1 + sizeof (arg32_t) / sizeof (int32_t) 639 int32_t buf[MY_BUFFER_SIZE32]; 640 int32_t *bufp; 641 arg32_t arg; 642 size_t resid = 0; 643 size_t size; 644 prnode_t *pnp = VTOP(vp); 645 int error; 646 int locked = 0; 647 648 while (uiop->uio_resid) { 649 /* 650 * Read several commands in one gulp. 651 */ 652 bufp = buf; 653 if (resid) { /* move incomplete command to front of buffer */ 654 int32_t *tail; 655 656 if (resid >= sizeof (buf)) 657 break; 658 tail = (int32_t *)((char *)buf + sizeof (buf) - resid); 659 do { 660 *bufp++ = *tail++; 661 } while ((resid -= sizeof (int32_t)) != 0); 662 } 663 resid = sizeof (buf) - ((char *)bufp - (char *)buf); 664 if (resid > uiop->uio_resid) 665 resid = uiop->uio_resid; 666 if (error = uiomove((caddr_t)bufp, resid, UIO_WRITE, uiop)) 667 return (error); 668 resid += (char *)bufp - (char *)buf; 669 bufp = buf; 670 671 do { /* loop over commands in buffer */ 672 int32_t cmd = bufp[0]; 673 arg32_t *argp = (arg32_t *)&bufp[1]; 674 675 size = ctlsize32(cmd, resid, argp); 676 if (size == 0) /* incomplete or invalid command */ 677 break; 678 /* 679 * Perform the specified control operation. 680 */ 681 if (!locked) { 682 if ((error = prlock(pnp, ZNO)) != 0) 683 return (error); 684 locked = 1; 685 } 686 687 /* 688 * Since some members of the arg32_t union contain 689 * 64-bit values (which must be 64-bit aligned), we 690 * can't simply pass a pointer to the structure as 691 * it may be unaligned. Note that we do pass the 692 * potentially unaligned structure to ctlsize32() 693 * above, but that uses it a way that makes no 694 * assumptions about alignment. 695 */ 696 ASSERT(size - sizeof (cmd) <= sizeof (arg)); 697 bcopy(argp, &arg, size - sizeof (cmd)); 698 699 if (error = pr_control32(cmd, &arg, pnp, cr)) { 700 if (error == -1) /* -1 is timeout */ 701 locked = 0; 702 else 703 return (error); 704 } 705 bufp = (int32_t *)((char *)bufp + size); 706 } while ((resid -= size) != 0); 707 708 if (locked) { 709 prunlock(pnp); 710 locked = 0; 711 } 712 } 713 return (resid? EINVAL : 0); 714 } 715 716 static int 717 pr_control32(int32_t cmd, arg32_t *argp, prnode_t *pnp, cred_t *cr) 718 { 719 prcommon_t *pcp; 720 proc_t *p; 721 int unlocked; 722 int error = 0; 723 724 if (cmd == PCNULL) 725 return (0); 726 727 pcp = pnp->pr_common; 728 p = pcp->prc_proc; 729 ASSERT(p != NULL); 730 731 if (p->p_flag & SSYS) { 732 prunlock(pnp); 733 return (EBUSY); 734 } 735 736 switch (cmd) { 737 738 default: 739 error = EINVAL; 740 break; 741 742 case PCSTOP: /* direct process or lwp to stop and wait for stop */ 743 case PCDSTOP: /* direct process or lwp to stop, don't wait */ 744 case PCWSTOP: /* wait for process or lwp to stop */ 745 case PCTWSTOP: /* wait for process or lwp to stop, with timeout */ 746 { 747 time_t timeo; 748 749 /* 750 * Can't apply to a system process. 751 */ 752 if (p->p_as == &kas) { 753 error = EBUSY; 754 break; 755 } 756 757 if (cmd == PCSTOP || cmd == PCDSTOP) 758 pr_stop(pnp); 759 760 if (cmd == PCDSTOP) 761 break; 762 763 /* 764 * If an lwp is waiting for itself or its process, 765 * don't wait. The lwp will never see the fact that 766 * itself is stopped. 767 */ 768 if ((pcp->prc_flags & PRC_LWP)? 769 (pcp->prc_thread == curthread) : (p == curproc)) { 770 if (cmd == PCWSTOP || cmd == PCTWSTOP) 771 error = EBUSY; 772 break; 773 } 774 775 timeo = (cmd == PCTWSTOP)? (time_t)argp->timeo : 0; 776 if ((error = pr_wait_stop(pnp, timeo)) != 0) 777 return (error); 778 779 break; 780 } 781 782 case PCRUN: /* make lwp or process runnable */ 783 error = pr_setrun(pnp, (ulong_t)argp->flags); 784 break; 785 786 case PCSTRACE: /* set signal trace mask */ 787 pr_settrace(p, &argp->sigset); 788 break; 789 790 case PCSSIG: /* set current signal */ 791 if (PROCESS_NOT_32BIT(p)) 792 error = EOVERFLOW; 793 else { 794 int sig = (int)argp->siginfo.si_signo; 795 siginfo_t siginfo; 796 797 bzero(&siginfo, sizeof (siginfo)); 798 siginfo_32tok(&argp->siginfo, (k_siginfo_t *)&siginfo); 799 error = pr_setsig(pnp, &siginfo); 800 if (sig == SIGKILL && error == 0) { 801 prunlock(pnp); 802 pr_wait_die(pnp); 803 return (-1); 804 } 805 } 806 break; 807 808 case PCKILL: /* send signal */ 809 error = pr_kill(pnp, (int)argp->sig, cr); 810 if (error == 0 && argp->sig == SIGKILL) { 811 prunlock(pnp); 812 pr_wait_die(pnp); 813 return (-1); 814 } 815 break; 816 817 case PCUNKILL: /* delete a pending signal */ 818 error = pr_unkill(pnp, (int)argp->sig); 819 break; 820 821 case PCNICE: /* set nice priority */ 822 error = pr_nice(p, (int)argp->nice, cr); 823 break; 824 825 case PCSENTRY: /* set syscall entry bit mask */ 826 case PCSEXIT: /* set syscall exit bit mask */ 827 pr_setentryexit(p, &argp->sysset, cmd == PCSENTRY); 828 break; 829 830 case PCSET: /* set process flags */ 831 error = pr_set(p, (long)argp->flags); 832 break; 833 834 case PCUNSET: /* unset process flags */ 835 error = pr_unset(p, (long)argp->flags); 836 break; 837 838 case PCSREG: /* set general registers */ 839 if (PROCESS_NOT_32BIT(p)) 840 error = EOVERFLOW; 841 else { 842 kthread_t *t = pr_thread(pnp); 843 844 if (!ISTOPPED(t) && !VSTOPPED(t) && !DSTOPPED(t)) { 845 thread_unlock(t); 846 error = EBUSY; 847 } else { 848 prgregset_t prgregset; 849 klwp_t *lwp = ttolwp(t); 850 851 thread_unlock(t); 852 mutex_exit(&p->p_lock); 853 prgregset_32ton(lwp, argp->prgregset, 854 prgregset); 855 prsetprregs(lwp, prgregset, 0); 856 mutex_enter(&p->p_lock); 857 } 858 } 859 break; 860 861 case PCSFPREG: /* set floating-point registers */ 862 if (PROCESS_NOT_32BIT(p)) 863 error = EOVERFLOW; 864 else 865 error = pr_setfpregs32(pnp, &argp->prfpregset); 866 break; 867 868 case PCSXREG: /* set extra registers */ 869 #if defined(__sparc) 870 if (PROCESS_NOT_32BIT(p)) 871 error = EOVERFLOW; 872 else 873 error = pr_setxregs(pnp, &argp->prxregset); 874 #else 875 error = EINVAL; 876 #endif 877 break; 878 879 case PCSVADDR: /* set virtual address at which to resume */ 880 if (PROCESS_NOT_32BIT(p)) 881 error = EOVERFLOW; 882 else 883 error = pr_setvaddr(pnp, 884 (caddr_t)(uintptr_t)argp->vaddr); 885 break; 886 887 case PCSHOLD: /* set signal-hold mask */ 888 pr_sethold(pnp, &argp->sigset); 889 break; 890 891 case PCSFAULT: /* set mask of traced faults */ 892 pr_setfault(p, &argp->fltset); 893 break; 894 895 case PCCSIG: /* clear current signal */ 896 error = pr_clearsig(pnp); 897 break; 898 899 case PCCFAULT: /* clear current fault */ 900 error = pr_clearflt(pnp); 901 break; 902 903 case PCWATCH: /* set or clear watched areas */ 904 if (PROCESS_NOT_32BIT(p)) 905 error = EOVERFLOW; 906 else { 907 prwatch_t prwatch; 908 909 prwatch.pr_vaddr = argp->prwatch.pr_vaddr; 910 prwatch.pr_size = argp->prwatch.pr_size; 911 prwatch.pr_wflags = argp->prwatch.pr_wflags; 912 prwatch.pr_pad = argp->prwatch.pr_pad; 913 error = pr_watch(pnp, &prwatch, &unlocked); 914 if (error && unlocked) 915 return (error); 916 } 917 break; 918 919 case PCAGENT: /* create the /proc agent lwp in the target process */ 920 if (PROCESS_NOT_32BIT(p)) 921 error = EOVERFLOW; 922 else { 923 prgregset_t prgregset; 924 kthread_t *t = pr_thread(pnp); 925 klwp_t *lwp = ttolwp(t); 926 thread_unlock(t); 927 mutex_exit(&p->p_lock); 928 prgregset_32ton(lwp, argp->prgregset, prgregset); 929 mutex_enter(&p->p_lock); 930 error = pr_agent(pnp, prgregset, &unlocked); 931 if (error && unlocked) 932 return (error); 933 } 934 break; 935 936 case PCREAD: /* read from the address space */ 937 case PCWRITE: /* write to the address space */ 938 if (PROCESS_NOT_32BIT(p)) 939 error = EOVERFLOW; 940 else { 941 enum uio_rw rw = (cmd == PCREAD)? UIO_READ : UIO_WRITE; 942 priovec_t priovec; 943 944 priovec.pio_base = 945 (void *)(uintptr_t)argp->priovec.pio_base; 946 priovec.pio_len = (size_t)argp->priovec.pio_len; 947 priovec.pio_offset = (off_t) 948 (uint32_t)argp->priovec.pio_offset; 949 error = pr_rdwr(p, rw, &priovec); 950 } 951 break; 952 953 case PCSCRED: /* set the process credentials */ 954 case PCSCREDX: 955 { 956 /* 957 * All the fields in these structures are exactly the 958 * same and so the structures are compatible. In case 959 * this ever changes, we catch this with the ASSERT 960 * below. 961 */ 962 prcred_t *prcred = (prcred_t *)&argp->prcred; 963 964 #ifndef __lint 965 ASSERT(sizeof (prcred_t) == sizeof (prcred32_t)); 966 #endif 967 968 error = pr_scred(p, prcred, cr, cmd == PCSCREDX); 969 break; 970 } 971 972 case PCSPRIV: /* set the process privileges */ 973 error = pr_spriv(p, &argp->prpriv, cr); 974 break; 975 976 case PCSZONE: /* set the process's zoneid */ 977 error = pr_szoneid(p, (zoneid_t)argp->przoneid, cr); 978 break; 979 } 980 981 if (error) 982 prunlock(pnp); 983 return (error); 984 } 985 986 #endif /* _SYSCALL32_IMPL */ 987 988 /* 989 * Return the specific or chosen thread/lwp for a control operation. 990 * Returns with the thread locked via thread_lock(t). 991 */ 992 kthread_t * 993 pr_thread(prnode_t *pnp) 994 { 995 prcommon_t *pcp = pnp->pr_common; 996 kthread_t *t; 997 998 if (pcp->prc_flags & PRC_LWP) { 999 t = pcp->prc_thread; 1000 ASSERT(t != NULL); 1001 thread_lock(t); 1002 } else { 1003 proc_t *p = pcp->prc_proc; 1004 t = prchoose(p); /* returns locked thread */ 1005 ASSERT(t != NULL); 1006 } 1007 1008 return (t); 1009 } 1010 1011 /* 1012 * Direct the process or lwp to stop. 1013 */ 1014 void 1015 pr_stop(prnode_t *pnp) 1016 { 1017 prcommon_t *pcp = pnp->pr_common; 1018 proc_t *p = pcp->prc_proc; 1019 kthread_t *t; 1020 vnode_t *vp; 1021 1022 /* 1023 * If already stopped, do nothing; otherwise flag 1024 * it to be stopped the next time it tries to run. 1025 * If sleeping at interruptible priority, set it 1026 * running so it will stop within cv_wait_sig(). 1027 * 1028 * Take care to cooperate with jobcontrol: if an lwp 1029 * is stopped due to the default action of a jobcontrol 1030 * stop signal, flag it to be stopped the next time it 1031 * starts due to a SIGCONT signal. 1032 */ 1033 if (pcp->prc_flags & PRC_LWP) 1034 t = pcp->prc_thread; 1035 else 1036 t = p->p_tlist; 1037 ASSERT(t != NULL); 1038 1039 do { 1040 int notify; 1041 1042 notify = 0; 1043 thread_lock(t); 1044 if (!ISTOPPED(t)) { 1045 t->t_proc_flag |= TP_PRSTOP; 1046 t->t_sig_check = 1; /* do ISSIG */ 1047 } 1048 1049 /* Move the thread from wait queue to run queue */ 1050 if (ISWAITING(t)) 1051 setrun_locked(t); 1052 1053 if (ISWAKEABLE(t)) { 1054 if (t->t_wchan0 == NULL) 1055 setrun_locked(t); 1056 else if (!VSTOPPED(t)) { 1057 /* 1058 * Mark it virtually stopped. 1059 */ 1060 t->t_proc_flag |= TP_PRVSTOP; 1061 notify = 1; 1062 } 1063 } 1064 /* 1065 * force the thread into the kernel 1066 * if it is not already there. 1067 */ 1068 prpokethread(t); 1069 thread_unlock(t); 1070 if (notify && 1071 (vp = p->p_lwpdir[t->t_dslot].ld_entry->le_trace) != NULL) 1072 prnotify(vp); 1073 if (pcp->prc_flags & PRC_LWP) 1074 break; 1075 } while ((t = t->t_forw) != p->p_tlist); 1076 1077 /* 1078 * We do this just in case the thread we asked 1079 * to stop is in holdlwps() (called from cfork()). 1080 */ 1081 cv_broadcast(&p->p_holdlwps); 1082 } 1083 1084 /* 1085 * Sleep until the lwp stops, but cooperate with 1086 * jobcontrol: Don't wake up if the lwp is stopped 1087 * due to the default action of a jobcontrol stop signal. 1088 * If this is the process file descriptor, sleep 1089 * until all of the process's lwps stop. 1090 */ 1091 int 1092 pr_wait_stop(prnode_t *pnp, time_t timeo) 1093 { 1094 prcommon_t *pcp = pnp->pr_common; 1095 proc_t *p = pcp->prc_proc; 1096 timestruc_t rqtime; 1097 timestruc_t *rqtp = NULL; 1098 int timecheck = 0; 1099 kthread_t *t; 1100 int error; 1101 1102 if (timeo > 0) { /* millisecond timeout */ 1103 /* 1104 * Determine the precise future time of the requested timeout. 1105 */ 1106 timestruc_t now; 1107 1108 timecheck = timechanged; 1109 gethrestime(&now); 1110 rqtp = &rqtime; 1111 rqtp->tv_sec = timeo / MILLISEC; 1112 rqtp->tv_nsec = (timeo % MILLISEC) * MICROSEC; 1113 timespecadd(rqtp, &now); 1114 } 1115 1116 if (pcp->prc_flags & PRC_LWP) { /* lwp file descriptor */ 1117 t = pcp->prc_thread; 1118 ASSERT(t != NULL); 1119 thread_lock(t); 1120 while (!ISTOPPED(t) && !VSTOPPED(t)) { 1121 thread_unlock(t); 1122 mutex_enter(&pcp->prc_mutex); 1123 prunlock(pnp); 1124 error = pr_wait(pcp, rqtp, timecheck); 1125 if (error) /* -1 is timeout */ 1126 return (error); 1127 if ((error = prlock(pnp, ZNO)) != 0) 1128 return (error); 1129 ASSERT(p == pcp->prc_proc); 1130 ASSERT(t == pcp->prc_thread); 1131 thread_lock(t); 1132 } 1133 thread_unlock(t); 1134 } else { /* process file descriptor */ 1135 t = prchoose(p); /* returns locked thread */ 1136 ASSERT(t != NULL); 1137 ASSERT(MUTEX_HELD(&p->p_lock)); 1138 while ((!ISTOPPED(t) && !VSTOPPED(t) && !SUSPENDED(t)) || 1139 (p->p_flag & SEXITLWPS)) { 1140 thread_unlock(t); 1141 mutex_enter(&pcp->prc_mutex); 1142 prunlock(pnp); 1143 error = pr_wait(pcp, rqtp, timecheck); 1144 if (error) /* -1 is timeout */ 1145 return (error); 1146 if ((error = prlock(pnp, ZNO)) != 0) 1147 return (error); 1148 ASSERT(p == pcp->prc_proc); 1149 t = prchoose(p); /* returns locked t */ 1150 ASSERT(t != NULL); 1151 } 1152 thread_unlock(t); 1153 } 1154 1155 ASSERT(!(pcp->prc_flags & PRC_DESTROY) && p->p_stat != SZOMB && 1156 t != NULL && t->t_state != TS_ZOMB); 1157 1158 return (0); 1159 } 1160 1161 int 1162 pr_setrun(prnode_t *pnp, ulong_t flags) 1163 { 1164 prcommon_t *pcp = pnp->pr_common; 1165 proc_t *p = pcp->prc_proc; 1166 kthread_t *t; 1167 klwp_t *lwp; 1168 1169 /* 1170 * Cannot set an lwp running if it is not stopped. 1171 * Also, no lwp other than the /proc agent lwp can 1172 * be set running so long as the /proc agent lwp exists. 1173 */ 1174 t = pr_thread(pnp); /* returns locked thread */ 1175 if ((!ISTOPPED(t) && !VSTOPPED(t) && 1176 !(t->t_proc_flag & TP_PRSTOP)) || 1177 (p->p_agenttp != NULL && 1178 (t != p->p_agenttp || !(pcp->prc_flags & PRC_LWP)))) { 1179 thread_unlock(t); 1180 return (EBUSY); 1181 } 1182 thread_unlock(t); 1183 if (flags & ~(PRCSIG|PRCFAULT|PRSTEP|PRSTOP|PRSABORT)) 1184 return (EINVAL); 1185 lwp = ttolwp(t); 1186 if ((flags & PRCSIG) && lwp->lwp_cursig != SIGKILL) { 1187 /* 1188 * Discard current siginfo_t, if any. 1189 */ 1190 lwp->lwp_cursig = 0; 1191 lwp->lwp_extsig = 0; 1192 if (lwp->lwp_curinfo) { 1193 siginfofree(lwp->lwp_curinfo); 1194 lwp->lwp_curinfo = NULL; 1195 } 1196 } 1197 if (flags & PRCFAULT) 1198 lwp->lwp_curflt = 0; 1199 /* 1200 * We can't hold p->p_lock when we touch the lwp's registers. 1201 * It may be swapped out and we will get a page fault. 1202 */ 1203 if (flags & PRSTEP) { 1204 mutex_exit(&p->p_lock); 1205 prstep(lwp, 0); 1206 mutex_enter(&p->p_lock); 1207 } 1208 if (flags & PRSTOP) { 1209 t->t_proc_flag |= TP_PRSTOP; 1210 t->t_sig_check = 1; /* do ISSIG */ 1211 } 1212 if (flags & PRSABORT) 1213 lwp->lwp_sysabort = 1; 1214 thread_lock(t); 1215 if ((pcp->prc_flags & PRC_LWP) || (flags & (PRSTEP|PRSTOP))) { 1216 /* 1217 * Here, we are dealing with a single lwp. 1218 */ 1219 if (ISTOPPED(t)) { 1220 t->t_schedflag |= TS_PSTART; 1221 t->t_dtrace_stop = 0; 1222 setrun_locked(t); 1223 } else if (flags & PRSABORT) { 1224 t->t_proc_flag &= 1225 ~(TP_PRSTOP|TP_PRVSTOP|TP_STOPPING); 1226 setrun_locked(t); 1227 } else if (!(flags & PRSTOP)) { 1228 t->t_proc_flag &= 1229 ~(TP_PRSTOP|TP_PRVSTOP|TP_STOPPING); 1230 } 1231 thread_unlock(t); 1232 } else { 1233 /* 1234 * Here, we are dealing with the whole process. 1235 */ 1236 if (ISTOPPED(t)) { 1237 /* 1238 * The representative lwp is stopped on an event 1239 * of interest. We demote it to PR_REQUESTED and 1240 * choose another representative lwp. If the new 1241 * representative lwp is not stopped on an event of 1242 * interest (other than PR_REQUESTED), we set the 1243 * whole process running, else we leave the process 1244 * stopped showing the next event of interest. 1245 */ 1246 kthread_t *tx = NULL; 1247 1248 if (!(flags & PRSABORT) && 1249 t->t_whystop == PR_SYSENTRY && 1250 t->t_whatstop == SYS_lwp_exit) 1251 tx = t; /* remember the exiting lwp */ 1252 t->t_whystop = PR_REQUESTED; 1253 t->t_whatstop = 0; 1254 thread_unlock(t); 1255 t = prchoose(p); /* returns locked t */ 1256 ASSERT(ISTOPPED(t) || VSTOPPED(t)); 1257 if (VSTOPPED(t) || 1258 t->t_whystop == PR_REQUESTED) { 1259 thread_unlock(t); 1260 allsetrun(p); 1261 } else { 1262 thread_unlock(t); 1263 /* 1264 * As a special case, if the old representative 1265 * lwp was stopped on entry to _lwp_exit() 1266 * (and we are not aborting the system call), 1267 * we set the old representative lwp running. 1268 * We do this so that the next process stop 1269 * will find the exiting lwp gone. 1270 */ 1271 if (tx != NULL) { 1272 thread_lock(tx); 1273 tx->t_schedflag |= TS_PSTART; 1274 t->t_dtrace_stop = 0; 1275 setrun_locked(tx); 1276 thread_unlock(tx); 1277 } 1278 } 1279 } else { 1280 /* 1281 * No event of interest; set all of the lwps running. 1282 */ 1283 if (flags & PRSABORT) { 1284 t->t_proc_flag &= 1285 ~(TP_PRSTOP|TP_PRVSTOP|TP_STOPPING); 1286 setrun_locked(t); 1287 } 1288 thread_unlock(t); 1289 allsetrun(p); 1290 } 1291 } 1292 return (0); 1293 } 1294 1295 /* 1296 * Wait until process/lwp stops or until timer expires. 1297 * Return EINTR for an interruption, -1 for timeout, else 0. 1298 */ 1299 int 1300 pr_wait(prcommon_t *pcp, /* prcommon referring to process/lwp */ 1301 timestruc_t *ts, /* absolute time of timeout, if any */ 1302 int timecheck) 1303 { 1304 int rval; 1305 1306 ASSERT(MUTEX_HELD(&pcp->prc_mutex)); 1307 rval = cv_waituntil_sig(&pcp->prc_wait, &pcp->prc_mutex, ts, timecheck); 1308 mutex_exit(&pcp->prc_mutex); 1309 switch (rval) { 1310 case 0: 1311 return (EINTR); 1312 case -1: 1313 return (-1); 1314 default: 1315 return (0); 1316 } 1317 } 1318 1319 /* 1320 * Make all threads in the process runnable. 1321 */ 1322 void 1323 allsetrun(proc_t *p) 1324 { 1325 kthread_t *t; 1326 1327 ASSERT(MUTEX_HELD(&p->p_lock)); 1328 1329 if ((t = p->p_tlist) != NULL) { 1330 do { 1331 thread_lock(t); 1332 ASSERT(!(t->t_proc_flag & TP_LWPEXIT)); 1333 t->t_proc_flag &= ~(TP_PRSTOP|TP_PRVSTOP|TP_STOPPING); 1334 if (ISTOPPED(t)) { 1335 t->t_schedflag |= TS_PSTART; 1336 t->t_dtrace_stop = 0; 1337 setrun_locked(t); 1338 } 1339 thread_unlock(t); 1340 } while ((t = t->t_forw) != p->p_tlist); 1341 } 1342 } 1343 1344 /* 1345 * Wait for the process to die. 1346 * We do this after sending SIGKILL because we know it will 1347 * die soon and we want subsequent operations to return ENOENT. 1348 */ 1349 void 1350 pr_wait_die(prnode_t *pnp) 1351 { 1352 proc_t *p; 1353 1354 mutex_enter(&pidlock); 1355 while ((p = pnp->pr_common->prc_proc) != NULL && p->p_stat != SZOMB) { 1356 if (!cv_wait_sig(&p->p_srwchan_cv, &pidlock)) 1357 break; 1358 } 1359 mutex_exit(&pidlock); 1360 } 1361 1362 static void 1363 pr_settrace(proc_t *p, sigset_t *sp) 1364 { 1365 prdelset(sp, SIGKILL); 1366 prassignset(&p->p_sigmask, sp); 1367 if (!sigisempty(&p->p_sigmask)) 1368 p->p_proc_flag |= P_PR_TRACE; 1369 else if (prisempty(&p->p_fltmask)) { 1370 user_t *up = PTOU(p); 1371 if (up->u_systrap == 0) 1372 p->p_proc_flag &= ~P_PR_TRACE; 1373 } 1374 } 1375 1376 int 1377 pr_setsig(prnode_t *pnp, siginfo_t *sip) 1378 { 1379 int nsig = PROC_IS_BRANDED(curproc)? BROP(curproc)->b_nsig : NSIG; 1380 int sig = sip->si_signo; 1381 prcommon_t *pcp = pnp->pr_common; 1382 proc_t *p = pcp->prc_proc; 1383 kthread_t *t; 1384 klwp_t *lwp; 1385 int error = 0; 1386 1387 t = pr_thread(pnp); /* returns locked thread */ 1388 thread_unlock(t); 1389 lwp = ttolwp(t); 1390 if (sig < 0 || sig >= nsig) 1391 /* Zero allowed here */ 1392 error = EINVAL; 1393 else if (lwp->lwp_cursig == SIGKILL) 1394 /* "can't happen", but just in case */ 1395 error = EBUSY; 1396 else if ((lwp->lwp_cursig = (uchar_t)sig) == 0) { 1397 lwp->lwp_extsig = 0; 1398 /* 1399 * Discard current siginfo_t, if any. 1400 */ 1401 if (lwp->lwp_curinfo) { 1402 siginfofree(lwp->lwp_curinfo); 1403 lwp->lwp_curinfo = NULL; 1404 } 1405 } else { 1406 kthread_t *tx; 1407 sigqueue_t *sqp; 1408 1409 /* drop p_lock to do kmem_alloc(KM_SLEEP) */ 1410 mutex_exit(&p->p_lock); 1411 sqp = kmem_zalloc(sizeof (sigqueue_t), KM_SLEEP); 1412 mutex_enter(&p->p_lock); 1413 1414 if (lwp->lwp_curinfo == NULL) 1415 lwp->lwp_curinfo = sqp; 1416 else 1417 kmem_free(sqp, sizeof (sigqueue_t)); 1418 /* 1419 * Copy contents of info to current siginfo_t. 1420 */ 1421 bcopy(sip, &lwp->lwp_curinfo->sq_info, 1422 sizeof (lwp->lwp_curinfo->sq_info)); 1423 /* 1424 * Prevent contents published by si_zoneid-unaware /proc 1425 * consumers from being incorrectly filtered. Because 1426 * an uninitialized si_zoneid is the same as 1427 * GLOBAL_ZONEID, this means that you can't pr_setsig a 1428 * process in a non-global zone with a siginfo which 1429 * appears to come from the global zone. 1430 */ 1431 if (SI_FROMUSER(sip) && sip->si_zoneid == 0) 1432 lwp->lwp_curinfo->sq_info.si_zoneid = 1433 p->p_zone->zone_id; 1434 /* 1435 * Side-effects for SIGKILL and jobcontrol signals. 1436 */ 1437 if (sig == SIGKILL) { 1438 p->p_flag |= SKILLED; 1439 p->p_flag &= ~SEXTKILLED; 1440 } else if (sig == SIGCONT) { 1441 p->p_flag |= SSCONT; 1442 sigdelq(p, NULL, SIGSTOP); 1443 sigdelq(p, NULL, SIGTSTP); 1444 sigdelq(p, NULL, SIGTTOU); 1445 sigdelq(p, NULL, SIGTTIN); 1446 sigdiffset(&p->p_sig, &stopdefault); 1447 sigdiffset(&p->p_extsig, &stopdefault); 1448 if ((tx = p->p_tlist) != NULL) { 1449 do { 1450 sigdelq(p, tx, SIGSTOP); 1451 sigdelq(p, tx, SIGTSTP); 1452 sigdelq(p, tx, SIGTTOU); 1453 sigdelq(p, tx, SIGTTIN); 1454 sigdiffset(&tx->t_sig, &stopdefault); 1455 sigdiffset(&tx->t_extsig, &stopdefault); 1456 } while ((tx = tx->t_forw) != p->p_tlist); 1457 } 1458 } else if (sigismember(&stopdefault, sig)) { 1459 if (PTOU(p)->u_signal[sig-1] == SIG_DFL && 1460 (sig == SIGSTOP || !p->p_pgidp->pid_pgorphaned)) 1461 p->p_flag &= ~SSCONT; 1462 sigdelq(p, NULL, SIGCONT); 1463 sigdelset(&p->p_sig, SIGCONT); 1464 sigdelset(&p->p_extsig, SIGCONT); 1465 if ((tx = p->p_tlist) != NULL) { 1466 do { 1467 sigdelq(p, tx, SIGCONT); 1468 sigdelset(&tx->t_sig, SIGCONT); 1469 sigdelset(&tx->t_extsig, SIGCONT); 1470 } while ((tx = tx->t_forw) != p->p_tlist); 1471 } 1472 } 1473 thread_lock(t); 1474 if (ISWAKEABLE(t) || ISWAITING(t)) { 1475 /* Set signaled sleeping/waiting lwp running */ 1476 setrun_locked(t); 1477 } else if (t->t_state == TS_STOPPED && sig == SIGKILL) { 1478 /* If SIGKILL, set stopped lwp running */ 1479 p->p_stopsig = 0; 1480 t->t_schedflag |= TS_XSTART | TS_PSTART; 1481 t->t_dtrace_stop = 0; 1482 setrun_locked(t); 1483 } 1484 t->t_sig_check = 1; /* so ISSIG will be done */ 1485 thread_unlock(t); 1486 /* 1487 * More jobcontrol side-effects. 1488 */ 1489 if (sig == SIGCONT && (tx = p->p_tlist) != NULL) { 1490 p->p_stopsig = 0; 1491 do { 1492 thread_lock(tx); 1493 if (tx->t_state == TS_STOPPED && 1494 tx->t_whystop == PR_JOBCONTROL) { 1495 tx->t_schedflag |= TS_XSTART; 1496 setrun_locked(tx); 1497 } 1498 thread_unlock(tx); 1499 } while ((tx = tx->t_forw) != p->p_tlist); 1500 } 1501 } 1502 return (error); 1503 } 1504 1505 int 1506 pr_kill(prnode_t *pnp, int sig, cred_t *cr) 1507 { 1508 int nsig = PROC_IS_BRANDED(curproc)? BROP(curproc)->b_nsig : NSIG; 1509 prcommon_t *pcp = pnp->pr_common; 1510 proc_t *p = pcp->prc_proc; 1511 k_siginfo_t info; 1512 1513 if (sig <= 0 || sig >= nsig) 1514 return (EINVAL); 1515 1516 bzero(&info, sizeof (info)); 1517 info.si_signo = sig; 1518 info.si_code = SI_USER; 1519 info.si_pid = curproc->p_pid; 1520 info.si_ctid = PRCTID(curproc); 1521 info.si_zoneid = getzoneid(); 1522 info.si_uid = crgetruid(cr); 1523 sigaddq(p, (pcp->prc_flags & PRC_LWP)? 1524 pcp->prc_thread : NULL, &info, KM_NOSLEEP); 1525 1526 return (0); 1527 } 1528 1529 int 1530 pr_unkill(prnode_t *pnp, int sig) 1531 { 1532 int nsig = PROC_IS_BRANDED(curproc)? BROP(curproc)->b_nsig : NSIG; 1533 prcommon_t *pcp = pnp->pr_common; 1534 proc_t *p = pcp->prc_proc; 1535 sigqueue_t *infop = NULL; 1536 1537 if (sig <= 0 || sig >= nsig || sig == SIGKILL) 1538 return (EINVAL); 1539 1540 if (pcp->prc_flags & PRC_LWP) 1541 sigdeq(p, pcp->prc_thread, sig, &infop); 1542 else 1543 sigdeq(p, NULL, sig, &infop); 1544 1545 if (infop) 1546 siginfofree(infop); 1547 1548 return (0); 1549 } 1550 1551 int 1552 pr_nice(proc_t *p, int nice, cred_t *cr) 1553 { 1554 kthread_t *t; 1555 int err; 1556 int error = 0; 1557 1558 t = p->p_tlist; 1559 do { 1560 ASSERT(!(t->t_proc_flag & TP_LWPEXIT)); 1561 err = CL_DONICE(t, cr, nice, (int *)NULL); 1562 schedctl_set_cidpri(t); 1563 if (error == 0) 1564 error = err; 1565 } while ((t = t->t_forw) != p->p_tlist); 1566 1567 return (error); 1568 } 1569 1570 void 1571 pr_setentryexit(proc_t *p, sysset_t *sysset, int entry) 1572 { 1573 user_t *up = PTOU(p); 1574 1575 if (entry) { 1576 prassignset(&up->u_entrymask, sysset); 1577 } else { 1578 prassignset(&up->u_exitmask, sysset); 1579 } 1580 if (!prisempty(&up->u_entrymask) || 1581 !prisempty(&up->u_exitmask)) { 1582 up->u_systrap = 1; 1583 p->p_proc_flag |= P_PR_TRACE; 1584 set_proc_sys(p); /* set pre and post-sys flags */ 1585 } else { 1586 up->u_systrap = 0; 1587 if (sigisempty(&p->p_sigmask) && 1588 prisempty(&p->p_fltmask)) 1589 p->p_proc_flag &= ~P_PR_TRACE; 1590 } 1591 } 1592 1593 #define ALLFLAGS \ 1594 (PR_FORK|PR_RLC|PR_KLC|PR_ASYNC|PR_BPTADJ|PR_MSACCT|PR_MSFORK|PR_PTRACE) 1595 1596 int 1597 pr_set(proc_t *p, long flags) 1598 { 1599 if ((p->p_flag & SSYS) || p->p_as == &kas) 1600 return (EBUSY); 1601 1602 if (flags & ~ALLFLAGS) 1603 return (EINVAL); 1604 1605 if (flags & PR_FORK) 1606 p->p_proc_flag |= P_PR_FORK; 1607 if (flags & PR_RLC) 1608 p->p_proc_flag |= P_PR_RUNLCL; 1609 if (flags & PR_KLC) 1610 p->p_proc_flag |= P_PR_KILLCL; 1611 if (flags & PR_ASYNC) 1612 p->p_proc_flag |= P_PR_ASYNC; 1613 if (flags & PR_BPTADJ) 1614 p->p_proc_flag |= P_PR_BPTADJ; 1615 if (flags & PR_MSACCT) 1616 if ((p->p_flag & SMSACCT) == 0) 1617 estimate_msacct(p->p_tlist, gethrtime()); 1618 if (flags & PR_MSFORK) 1619 p->p_flag |= SMSFORK; 1620 if (flags & PR_PTRACE) { 1621 p->p_proc_flag |= P_PR_PTRACE; 1622 /* ptraced process must die if parent dead */ 1623 if (p->p_ppid == 1) 1624 sigtoproc(p, NULL, SIGKILL); 1625 } 1626 1627 return (0); 1628 } 1629 1630 int 1631 pr_unset(proc_t *p, long flags) 1632 { 1633 if ((p->p_flag & SSYS) || p->p_as == &kas) 1634 return (EBUSY); 1635 1636 if (flags & ~ALLFLAGS) 1637 return (EINVAL); 1638 1639 if (flags & PR_FORK) 1640 p->p_proc_flag &= ~P_PR_FORK; 1641 if (flags & PR_RLC) 1642 p->p_proc_flag &= ~P_PR_RUNLCL; 1643 if (flags & PR_KLC) 1644 p->p_proc_flag &= ~P_PR_KILLCL; 1645 if (flags & PR_ASYNC) 1646 p->p_proc_flag &= ~P_PR_ASYNC; 1647 if (flags & PR_BPTADJ) 1648 p->p_proc_flag &= ~P_PR_BPTADJ; 1649 if (flags & PR_MSACCT) 1650 disable_msacct(p); 1651 if (flags & PR_MSFORK) 1652 p->p_flag &= ~SMSFORK; 1653 if (flags & PR_PTRACE) 1654 p->p_proc_flag &= ~P_PR_PTRACE; 1655 1656 return (0); 1657 } 1658 1659 static int 1660 pr_setfpregs(prnode_t *pnp, prfpregset_t *prfpregset) 1661 { 1662 proc_t *p = pnp->pr_common->prc_proc; 1663 kthread_t *t = pr_thread(pnp); /* returns locked thread */ 1664 1665 if (!ISTOPPED(t) && !VSTOPPED(t) && !DSTOPPED(t)) { 1666 thread_unlock(t); 1667 return (EBUSY); 1668 } 1669 if (!prhasfp()) { 1670 thread_unlock(t); 1671 return (EINVAL); /* No FP support */ 1672 } 1673 1674 /* drop p_lock while touching the lwp's stack */ 1675 thread_unlock(t); 1676 mutex_exit(&p->p_lock); 1677 prsetprfpregs(ttolwp(t), prfpregset); 1678 mutex_enter(&p->p_lock); 1679 1680 return (0); 1681 } 1682 1683 #ifdef _SYSCALL32_IMPL 1684 static int 1685 pr_setfpregs32(prnode_t *pnp, prfpregset32_t *prfpregset) 1686 { 1687 proc_t *p = pnp->pr_common->prc_proc; 1688 kthread_t *t = pr_thread(pnp); /* returns locked thread */ 1689 1690 if (!ISTOPPED(t) && !VSTOPPED(t) && !DSTOPPED(t)) { 1691 thread_unlock(t); 1692 return (EBUSY); 1693 } 1694 if (!prhasfp()) { 1695 thread_unlock(t); 1696 return (EINVAL); /* No FP support */ 1697 } 1698 1699 /* drop p_lock while touching the lwp's stack */ 1700 thread_unlock(t); 1701 mutex_exit(&p->p_lock); 1702 prsetprfpregs32(ttolwp(t), prfpregset); 1703 mutex_enter(&p->p_lock); 1704 1705 return (0); 1706 } 1707 #endif /* _SYSCALL32_IMPL */ 1708 1709 #if defined(__sparc) 1710 /* ARGSUSED */ 1711 static int 1712 pr_setxregs(prnode_t *pnp, prxregset_t *prxregset) 1713 { 1714 proc_t *p = pnp->pr_common->prc_proc; 1715 kthread_t *t = pr_thread(pnp); /* returns locked thread */ 1716 1717 if (!ISTOPPED(t) && !VSTOPPED(t) && !DSTOPPED(t)) { 1718 thread_unlock(t); 1719 return (EBUSY); 1720 } 1721 thread_unlock(t); 1722 1723 if (!prhasx(p)) 1724 return (EINVAL); /* No extra register support */ 1725 1726 /* drop p_lock while touching the lwp's stack */ 1727 mutex_exit(&p->p_lock); 1728 prsetprxregs(ttolwp(t), (caddr_t)prxregset); 1729 mutex_enter(&p->p_lock); 1730 1731 return (0); 1732 } 1733 1734 static int 1735 pr_setasrs(prnode_t *pnp, asrset_t asrset) 1736 { 1737 proc_t *p = pnp->pr_common->prc_proc; 1738 kthread_t *t = pr_thread(pnp); /* returns locked thread */ 1739 1740 if (!ISTOPPED(t) && !VSTOPPED(t) && !DSTOPPED(t)) { 1741 thread_unlock(t); 1742 return (EBUSY); 1743 } 1744 thread_unlock(t); 1745 1746 /* drop p_lock while touching the lwp's stack */ 1747 mutex_exit(&p->p_lock); 1748 prsetasregs(ttolwp(t), asrset); 1749 mutex_enter(&p->p_lock); 1750 1751 return (0); 1752 } 1753 #endif 1754 1755 static int 1756 pr_setvaddr(prnode_t *pnp, caddr_t vaddr) 1757 { 1758 proc_t *p = pnp->pr_common->prc_proc; 1759 kthread_t *t = pr_thread(pnp); /* returns locked thread */ 1760 1761 if (!ISTOPPED(t) && !VSTOPPED(t) && !DSTOPPED(t)) { 1762 thread_unlock(t); 1763 return (EBUSY); 1764 } 1765 1766 /* drop p_lock while touching the lwp's stack */ 1767 thread_unlock(t); 1768 mutex_exit(&p->p_lock); 1769 prsvaddr(ttolwp(t), vaddr); 1770 mutex_enter(&p->p_lock); 1771 1772 return (0); 1773 } 1774 1775 void 1776 pr_sethold(prnode_t *pnp, sigset_t *sp) 1777 { 1778 proc_t *p = pnp->pr_common->prc_proc; 1779 kthread_t *t = pr_thread(pnp); /* returns locked thread */ 1780 1781 schedctl_finish_sigblock(t); 1782 sigutok(sp, &t->t_hold); 1783 if (ISWAKEABLE(t) && 1784 (fsig(&p->p_sig, t) || fsig(&t->t_sig, t))) 1785 setrun_locked(t); 1786 t->t_sig_check = 1; /* so thread will see new holdmask */ 1787 thread_unlock(t); 1788 } 1789 1790 void 1791 pr_setfault(proc_t *p, fltset_t *fltp) 1792 { 1793 prassignset(&p->p_fltmask, fltp); 1794 if (!prisempty(&p->p_fltmask)) 1795 p->p_proc_flag |= P_PR_TRACE; 1796 else if (sigisempty(&p->p_sigmask)) { 1797 user_t *up = PTOU(p); 1798 if (up->u_systrap == 0) 1799 p->p_proc_flag &= ~P_PR_TRACE; 1800 } 1801 } 1802 1803 static int 1804 pr_clearsig(prnode_t *pnp) 1805 { 1806 kthread_t *t = pr_thread(pnp); /* returns locked thread */ 1807 klwp_t *lwp = ttolwp(t); 1808 1809 thread_unlock(t); 1810 if (lwp->lwp_cursig == SIGKILL) 1811 return (EBUSY); 1812 1813 /* 1814 * Discard current siginfo_t, if any. 1815 */ 1816 lwp->lwp_cursig = 0; 1817 lwp->lwp_extsig = 0; 1818 if (lwp->lwp_curinfo) { 1819 siginfofree(lwp->lwp_curinfo); 1820 lwp->lwp_curinfo = NULL; 1821 } 1822 1823 return (0); 1824 } 1825 1826 static int 1827 pr_clearflt(prnode_t *pnp) 1828 { 1829 kthread_t *t = pr_thread(pnp); /* returns locked thread */ 1830 1831 thread_unlock(t); 1832 ttolwp(t)->lwp_curflt = 0; 1833 1834 return (0); 1835 } 1836 1837 static int 1838 pr_watch(prnode_t *pnp, prwatch_t *pwp, int *unlocked) 1839 { 1840 proc_t *p = pnp->pr_common->prc_proc; 1841 struct as *as = p->p_as; 1842 uintptr_t vaddr = pwp->pr_vaddr; 1843 size_t size = pwp->pr_size; 1844 int wflags = pwp->pr_wflags; 1845 ulong_t newpage = 0; 1846 struct watched_area *pwa; 1847 int error; 1848 1849 *unlocked = 0; 1850 1851 /* 1852 * Can't apply to a system process. 1853 */ 1854 if ((p->p_flag & SSYS) || p->p_as == &kas) 1855 return (EBUSY); 1856 1857 /* 1858 * Verify that the address range does not wrap 1859 * and that only the proper flags were specified. 1860 */ 1861 if ((wflags & ~WA_TRAPAFTER) == 0) 1862 size = 0; 1863 if (vaddr + size < vaddr || 1864 (wflags & ~(WA_READ|WA_WRITE|WA_EXEC|WA_TRAPAFTER)) != 0 || 1865 ((wflags & ~WA_TRAPAFTER) != 0 && size == 0)) 1866 return (EINVAL); 1867 1868 /* 1869 * Don't let the address range go above as->a_userlimit. 1870 * There is no error here, just a limitation. 1871 */ 1872 if (vaddr >= (uintptr_t)as->a_userlimit) 1873 return (0); 1874 if (vaddr + size > (uintptr_t)as->a_userlimit) 1875 size = (uintptr_t)as->a_userlimit - vaddr; 1876 1877 /* 1878 * Compute maximum number of pages this will add. 1879 */ 1880 if ((wflags & ~WA_TRAPAFTER) != 0) { 1881 ulong_t pagespan = (vaddr + size) - (vaddr & PAGEMASK); 1882 newpage = btopr(pagespan); 1883 if (newpage > 2 * prnwatch) 1884 return (E2BIG); 1885 } 1886 1887 /* 1888 * Force the process to be fully stopped. 1889 */ 1890 if (p == curproc) { 1891 prunlock(pnp); 1892 while (holdwatch() != 0) 1893 continue; 1894 if ((error = prlock(pnp, ZNO)) != 0) { 1895 continuelwps(p); 1896 *unlocked = 1; 1897 return (error); 1898 } 1899 } else { 1900 pauselwps(p); 1901 while (pr_allstopped(p, 0) > 0) { 1902 /* 1903 * This cv/mutex pair is persistent even 1904 * if the process disappears after we 1905 * unmark it and drop p->p_lock. 1906 */ 1907 kcondvar_t *cv = &pr_pid_cv[p->p_slot]; 1908 kmutex_t *mp = &p->p_lock; 1909 1910 prunmark(p); 1911 (void) cv_wait(cv, mp); 1912 mutex_exit(mp); 1913 if ((error = prlock(pnp, ZNO)) != 0) { 1914 /* 1915 * Unpause the process if it exists. 1916 */ 1917 p = pr_p_lock(pnp); 1918 mutex_exit(&pr_pidlock); 1919 if (p != NULL) { 1920 unpauselwps(p); 1921 prunlock(pnp); 1922 } 1923 *unlocked = 1; 1924 return (error); 1925 } 1926 } 1927 } 1928 1929 /* 1930 * Drop p->p_lock in order to perform the rest of this. 1931 * The process is still locked with the P_PR_LOCK flag. 1932 */ 1933 mutex_exit(&p->p_lock); 1934 1935 pwa = kmem_alloc(sizeof (struct watched_area), KM_SLEEP); 1936 pwa->wa_vaddr = (caddr_t)vaddr; 1937 pwa->wa_eaddr = (caddr_t)vaddr + size; 1938 pwa->wa_flags = (ulong_t)wflags; 1939 1940 error = ((pwa->wa_flags & ~WA_TRAPAFTER) == 0)? 1941 clear_watched_area(p, pwa) : set_watched_area(p, pwa); 1942 1943 if (p == curproc) { 1944 setallwatch(); 1945 mutex_enter(&p->p_lock); 1946 continuelwps(p); 1947 } else { 1948 mutex_enter(&p->p_lock); 1949 unpauselwps(p); 1950 } 1951 1952 return (error); 1953 } 1954 1955 /* jobcontrol stopped, but with a /proc directed stop in effect */ 1956 #define JDSTOPPED(t) \ 1957 ((t)->t_state == TS_STOPPED && \ 1958 (t)->t_whystop == PR_JOBCONTROL && \ 1959 ((t)->t_proc_flag & TP_PRSTOP)) 1960 1961 /* 1962 * pr_agent() creates the agent lwp. If the process is exiting while 1963 * we are creating an agent lwp, then exitlwps() waits until the 1964 * agent has been created using prbarrier(). 1965 */ 1966 static int 1967 pr_agent(prnode_t *pnp, prgregset_t prgregset, int *unlocked) 1968 { 1969 proc_t *p = pnp->pr_common->prc_proc; 1970 prcommon_t *pcp; 1971 kthread_t *t; 1972 kthread_t *ct; 1973 klwp_t *clwp; 1974 k_sigset_t smask; 1975 int cid; 1976 void *bufp = NULL; 1977 int error; 1978 1979 *unlocked = 0; 1980 1981 /* 1982 * Cannot create the /proc agent lwp if :- 1983 * - the process is not fully stopped or directed to stop. 1984 * - there is an agent lwp already. 1985 * - the process has been killed. 1986 * - the process is exiting. 1987 * - it's a vfork(2) parent. 1988 */ 1989 t = prchoose(p); /* returns locked thread */ 1990 ASSERT(t != NULL); 1991 1992 if ((!ISTOPPED(t) && !VSTOPPED(t) && !SUSPENDED(t) && !JDSTOPPED(t)) || 1993 p->p_agenttp != NULL || 1994 (p->p_flag & (SKILLED | SEXITING | SVFWAIT))) { 1995 thread_unlock(t); 1996 return (EBUSY); 1997 } 1998 1999 thread_unlock(t); 2000 mutex_exit(&p->p_lock); 2001 2002 sigfillset(&smask); 2003 sigdiffset(&smask, &cantmask); 2004 clwp = lwp_create(lwp_rtt, NULL, 0, p, TS_STOPPED, 2005 t->t_pri, &smask, NOCLASS, 0); 2006 if (clwp == NULL) { 2007 mutex_enter(&p->p_lock); 2008 return (ENOMEM); 2009 } 2010 prsetprregs(clwp, prgregset, 1); 2011 retry: 2012 cid = t->t_cid; 2013 (void) CL_ALLOC(&bufp, cid, KM_SLEEP); 2014 mutex_enter(&p->p_lock); 2015 if (cid != t->t_cid) { 2016 /* 2017 * Someone just changed this thread's scheduling class, 2018 * so try pre-allocating the buffer again. Hopefully we 2019 * don't hit this often. 2020 */ 2021 mutex_exit(&p->p_lock); 2022 CL_FREE(cid, bufp); 2023 goto retry; 2024 } 2025 2026 clwp->lwp_ap = clwp->lwp_arg; 2027 clwp->lwp_eosys = NORMALRETURN; 2028 ct = lwptot(clwp); 2029 ct->t_clfuncs = t->t_clfuncs; 2030 CL_FORK(t, ct, bufp); 2031 ct->t_cid = t->t_cid; 2032 ct->t_proc_flag |= TP_PRSTOP; 2033 /* 2034 * Setting t_sysnum to zero causes post_syscall() 2035 * to bypass all syscall checks and go directly to 2036 * if (issig()) psig(); 2037 * so that the agent lwp will stop in issig_forreal() 2038 * showing PR_REQUESTED. 2039 */ 2040 ct->t_sysnum = 0; 2041 ct->t_post_sys = 1; 2042 ct->t_sig_check = 1; 2043 p->p_agenttp = ct; 2044 ct->t_proc_flag &= ~TP_HOLDLWP; 2045 2046 pcp = pnp->pr_pcommon; 2047 mutex_enter(&pcp->prc_mutex); 2048 2049 lwp_create_done(ct); 2050 2051 /* 2052 * Don't return until the agent is stopped on PR_REQUESTED. 2053 */ 2054 2055 for (;;) { 2056 prunlock(pnp); 2057 *unlocked = 1; 2058 2059 /* 2060 * Wait for the agent to stop and notify us. 2061 * If we've been interrupted, return that information. 2062 */ 2063 error = pr_wait(pcp, NULL, 0); 2064 if (error == EINTR) { 2065 error = 0; 2066 break; 2067 } 2068 2069 /* 2070 * Confirm that the agent LWP has stopped. 2071 */ 2072 2073 if ((error = prlock(pnp, ZNO)) != 0) 2074 break; 2075 *unlocked = 0; 2076 2077 /* 2078 * Since we dropped the lock on the process, the agent 2079 * may have disappeared or changed. Grab the current 2080 * agent and check fail if it has disappeared. 2081 */ 2082 if ((ct = p->p_agenttp) == NULL) { 2083 error = ENOENT; 2084 break; 2085 } 2086 2087 mutex_enter(&pcp->prc_mutex); 2088 thread_lock(ct); 2089 2090 if (ISTOPPED(ct)) { 2091 thread_unlock(ct); 2092 mutex_exit(&pcp->prc_mutex); 2093 break; 2094 } 2095 2096 thread_unlock(ct); 2097 } 2098 2099 return (error ? error : -1); 2100 } 2101 2102 static int 2103 pr_rdwr(proc_t *p, enum uio_rw rw, priovec_t *pio) 2104 { 2105 caddr_t base = (caddr_t)pio->pio_base; 2106 size_t cnt = pio->pio_len; 2107 uintptr_t offset = (uintptr_t)pio->pio_offset; 2108 struct uio auio; 2109 struct iovec aiov; 2110 int error = 0; 2111 2112 if ((p->p_flag & SSYS) || p->p_as == &kas) 2113 error = EIO; 2114 else if ((base + cnt) < base || (offset + cnt) < offset) 2115 error = EINVAL; 2116 else if (cnt != 0) { 2117 aiov.iov_base = base; 2118 aiov.iov_len = cnt; 2119 2120 auio.uio_loffset = offset; 2121 auio.uio_iov = &aiov; 2122 auio.uio_iovcnt = 1; 2123 auio.uio_resid = cnt; 2124 auio.uio_segflg = UIO_USERSPACE; 2125 auio.uio_llimit = (longlong_t)MAXOFFSET_T; 2126 auio.uio_fmode = FREAD|FWRITE; 2127 auio.uio_extflg = UIO_COPY_DEFAULT; 2128 2129 mutex_exit(&p->p_lock); 2130 error = prusrio(p, rw, &auio, 0); 2131 mutex_enter(&p->p_lock); 2132 2133 /* 2134 * We have no way to return the i/o count, 2135 * like read() or write() would do, so we 2136 * return an error if the i/o was truncated. 2137 */ 2138 if (auio.uio_resid != 0 && error == 0) 2139 error = EIO; 2140 } 2141 2142 return (error); 2143 } 2144 2145 static int 2146 pr_scred(proc_t *p, prcred_t *prcred, cred_t *cr, boolean_t dogrps) 2147 { 2148 kthread_t *t; 2149 cred_t *oldcred; 2150 cred_t *newcred; 2151 uid_t oldruid; 2152 int error; 2153 zone_t *zone = crgetzone(cr); 2154 2155 if (!VALID_UID(prcred->pr_euid, zone) || 2156 !VALID_UID(prcred->pr_ruid, zone) || 2157 !VALID_UID(prcred->pr_suid, zone) || 2158 !VALID_GID(prcred->pr_egid, zone) || 2159 !VALID_GID(prcred->pr_rgid, zone) || 2160 !VALID_GID(prcred->pr_sgid, zone)) 2161 return (EINVAL); 2162 2163 if (dogrps) { 2164 int ngrp = prcred->pr_ngroups; 2165 int i; 2166 2167 if (ngrp < 0 || ngrp > ngroups_max) 2168 return (EINVAL); 2169 2170 for (i = 0; i < ngrp; i++) { 2171 if (!VALID_GID(prcred->pr_groups[i], zone)) 2172 return (EINVAL); 2173 } 2174 } 2175 2176 error = secpolicy_allow_setid(cr, prcred->pr_euid, B_FALSE); 2177 2178 if (error == 0 && prcred->pr_ruid != prcred->pr_euid) 2179 error = secpolicy_allow_setid(cr, prcred->pr_ruid, B_FALSE); 2180 2181 if (error == 0 && prcred->pr_suid != prcred->pr_euid && 2182 prcred->pr_suid != prcred->pr_ruid) 2183 error = secpolicy_allow_setid(cr, prcred->pr_suid, B_FALSE); 2184 2185 if (error) 2186 return (error); 2187 2188 mutex_exit(&p->p_lock); 2189 2190 /* hold old cred so it doesn't disappear while we dup it */ 2191 mutex_enter(&p->p_crlock); 2192 crhold(oldcred = p->p_cred); 2193 mutex_exit(&p->p_crlock); 2194 newcred = crdup(oldcred); 2195 oldruid = crgetruid(oldcred); 2196 crfree(oldcred); 2197 2198 /* Error checking done above */ 2199 (void) crsetresuid(newcred, prcred->pr_ruid, prcred->pr_euid, 2200 prcred->pr_suid); 2201 (void) crsetresgid(newcred, prcred->pr_rgid, prcred->pr_egid, 2202 prcred->pr_sgid); 2203 2204 if (dogrps) { 2205 (void) crsetgroups(newcred, prcred->pr_ngroups, 2206 prcred->pr_groups); 2207 2208 } 2209 2210 mutex_enter(&p->p_crlock); 2211 oldcred = p->p_cred; 2212 p->p_cred = newcred; 2213 mutex_exit(&p->p_crlock); 2214 crfree(oldcred); 2215 2216 /* 2217 * Keep count of processes per uid consistent. 2218 */ 2219 if (oldruid != prcred->pr_ruid) { 2220 zoneid_t zoneid = crgetzoneid(newcred); 2221 2222 mutex_enter(&pidlock); 2223 upcount_dec(oldruid, zoneid); 2224 upcount_inc(prcred->pr_ruid, zoneid); 2225 mutex_exit(&pidlock); 2226 } 2227 2228 /* 2229 * Broadcast the cred change to the threads. 2230 */ 2231 mutex_enter(&p->p_lock); 2232 t = p->p_tlist; 2233 do { 2234 t->t_pre_sys = 1; /* so syscall will get new cred */ 2235 } while ((t = t->t_forw) != p->p_tlist); 2236 2237 return (0); 2238 } 2239 2240 /* 2241 * Change process credentials to specified zone. Used to temporarily 2242 * set a process to run in the global zone; only transitions between 2243 * the process's actual zone and the global zone are allowed. 2244 */ 2245 static int 2246 pr_szoneid(proc_t *p, zoneid_t zoneid, cred_t *cr) 2247 { 2248 kthread_t *t; 2249 cred_t *oldcred; 2250 cred_t *newcred; 2251 zone_t *zptr; 2252 zoneid_t oldzoneid; 2253 2254 if (secpolicy_zone_config(cr) != 0) 2255 return (EPERM); 2256 if (zoneid != GLOBAL_ZONEID && zoneid != p->p_zone->zone_id) 2257 return (EINVAL); 2258 if ((zptr = zone_find_by_id(zoneid)) == NULL) 2259 return (EINVAL); 2260 mutex_exit(&p->p_lock); 2261 mutex_enter(&p->p_crlock); 2262 oldcred = p->p_cred; 2263 crhold(oldcred); 2264 mutex_exit(&p->p_crlock); 2265 newcred = crdup(oldcred); 2266 oldzoneid = crgetzoneid(oldcred); 2267 crfree(oldcred); 2268 2269 crsetzone(newcred, zptr); 2270 zone_rele(zptr); 2271 2272 mutex_enter(&p->p_crlock); 2273 oldcred = p->p_cred; 2274 p->p_cred = newcred; 2275 mutex_exit(&p->p_crlock); 2276 crfree(oldcred); 2277 2278 /* 2279 * The target process is changing zones (according to its cred), so 2280 * update the per-zone upcounts, which are based on process creds. 2281 */ 2282 if (oldzoneid != zoneid) { 2283 uid_t ruid = crgetruid(newcred); 2284 2285 mutex_enter(&pidlock); 2286 upcount_dec(ruid, oldzoneid); 2287 upcount_inc(ruid, zoneid); 2288 mutex_exit(&pidlock); 2289 } 2290 /* 2291 * Broadcast the cred change to the threads. 2292 */ 2293 mutex_enter(&p->p_lock); 2294 t = p->p_tlist; 2295 do { 2296 t->t_pre_sys = 1; /* so syscall will get new cred */ 2297 } while ((t = t->t_forw) != p->p_tlist); 2298 2299 return (0); 2300 } 2301 2302 static int 2303 pr_spriv(proc_t *p, prpriv_t *prpriv, cred_t *cr) 2304 { 2305 kthread_t *t; 2306 int err; 2307 2308 ASSERT(MUTEX_HELD(&p->p_lock)); 2309 2310 if ((err = priv_pr_spriv(p, prpriv, cr)) == 0) { 2311 /* 2312 * Broadcast the cred change to the threads. 2313 */ 2314 t = p->p_tlist; 2315 do { 2316 t->t_pre_sys = 1; /* so syscall will get new cred */ 2317 } while ((t = t->t_forw) != p->p_tlist); 2318 } 2319 2320 return (err); 2321 } 2322 2323 /* 2324 * Return -1 if the process is the parent of a vfork(1) whose child has yet to 2325 * terminate or perform an exec(2). 2326 * 2327 * Returns 0 if the process is fully stopped except for the current thread (if 2328 * we are operating on our own process), 1 otherwise. 2329 * 2330 * If the watchstop flag is set, then we ignore threads with TP_WATCHSTOP set. 2331 * See holdwatch() for details. 2332 */ 2333 int 2334 pr_allstopped(proc_t *p, int watchstop) 2335 { 2336 kthread_t *t; 2337 int rv = 0; 2338 2339 ASSERT(MUTEX_HELD(&p->p_lock)); 2340 2341 if (p->p_flag & SVFWAIT) /* waiting for vfork'd child to exec */ 2342 return (-1); 2343 2344 if ((t = p->p_tlist) != NULL) { 2345 do { 2346 if (t == curthread || VSTOPPED(t) || 2347 (watchstop && (t->t_proc_flag & TP_WATCHSTOP))) 2348 continue; 2349 thread_lock(t); 2350 switch (t->t_state) { 2351 case TS_ZOMB: 2352 case TS_STOPPED: 2353 break; 2354 case TS_SLEEP: 2355 if (!(t->t_flag & T_WAKEABLE) || 2356 t->t_wchan0 == NULL) 2357 rv = 1; 2358 break; 2359 default: 2360 rv = 1; 2361 break; 2362 } 2363 thread_unlock(t); 2364 } while (rv == 0 && (t = t->t_forw) != p->p_tlist); 2365 } 2366 2367 return (rv); 2368 } 2369 2370 /* 2371 * Cause all lwps in the process to pause (for watchpoint operations). 2372 */ 2373 static void 2374 pauselwps(proc_t *p) 2375 { 2376 kthread_t *t; 2377 2378 ASSERT(MUTEX_HELD(&p->p_lock)); 2379 ASSERT(p != curproc); 2380 2381 if ((t = p->p_tlist) != NULL) { 2382 do { 2383 thread_lock(t); 2384 t->t_proc_flag |= TP_PAUSE; 2385 aston(t); 2386 if ((ISWAKEABLE(t) && (t->t_wchan0 == NULL)) || 2387 ISWAITING(t)) { 2388 setrun_locked(t); 2389 } 2390 prpokethread(t); 2391 thread_unlock(t); 2392 } while ((t = t->t_forw) != p->p_tlist); 2393 } 2394 } 2395 2396 /* 2397 * undo the effects of pauselwps() 2398 */ 2399 static void 2400 unpauselwps(proc_t *p) 2401 { 2402 kthread_t *t; 2403 2404 ASSERT(MUTEX_HELD(&p->p_lock)); 2405 ASSERT(p != curproc); 2406 2407 if ((t = p->p_tlist) != NULL) { 2408 do { 2409 thread_lock(t); 2410 t->t_proc_flag &= ~TP_PAUSE; 2411 if (t->t_state == TS_STOPPED) { 2412 t->t_schedflag |= TS_UNPAUSE; 2413 t->t_dtrace_stop = 0; 2414 setrun_locked(t); 2415 } 2416 thread_unlock(t); 2417 } while ((t = t->t_forw) != p->p_tlist); 2418 } 2419 } 2420 2421 /* 2422 * Cancel all watched areas. Called from prclose(). 2423 */ 2424 proc_t * 2425 pr_cancel_watch(prnode_t *pnp) 2426 { 2427 proc_t *p = pnp->pr_pcommon->prc_proc; 2428 struct as *as; 2429 kthread_t *t; 2430 2431 ASSERT(MUTEX_HELD(&p->p_lock) && (p->p_proc_flag & P_PR_LOCK)); 2432 2433 if (!pr_watch_active(p)) 2434 return (p); 2435 2436 /* 2437 * Pause the process before dealing with the watchpoints. 2438 */ 2439 if (p == curproc) { 2440 prunlock(pnp); 2441 while (holdwatch() != 0) 2442 continue; 2443 p = pr_p_lock(pnp); 2444 mutex_exit(&pr_pidlock); 2445 ASSERT(p == curproc); 2446 } else { 2447 pauselwps(p); 2448 while (p != NULL && pr_allstopped(p, 0) > 0) { 2449 /* 2450 * This cv/mutex pair is persistent even 2451 * if the process disappears after we 2452 * unmark it and drop p->p_lock. 2453 */ 2454 kcondvar_t *cv = &pr_pid_cv[p->p_slot]; 2455 kmutex_t *mp = &p->p_lock; 2456 2457 prunmark(p); 2458 (void) cv_wait(cv, mp); 2459 mutex_exit(mp); 2460 p = pr_p_lock(pnp); /* NULL if process disappeared */ 2461 mutex_exit(&pr_pidlock); 2462 } 2463 } 2464 2465 if (p == NULL) /* the process disappeared */ 2466 return (NULL); 2467 2468 ASSERT(p == pnp->pr_pcommon->prc_proc); 2469 ASSERT(MUTEX_HELD(&p->p_lock) && (p->p_proc_flag & P_PR_LOCK)); 2470 2471 if (pr_watch_active(p)) { 2472 pr_free_watchpoints(p); 2473 if ((t = p->p_tlist) != NULL) { 2474 do { 2475 watch_disable(t); 2476 2477 } while ((t = t->t_forw) != p->p_tlist); 2478 } 2479 } 2480 2481 if ((as = p->p_as) != NULL) { 2482 avl_tree_t *tree; 2483 struct watched_page *pwp; 2484 2485 /* 2486 * If this is the parent of a vfork, the watched page 2487 * list has been moved temporarily to p->p_wpage. 2488 */ 2489 if (avl_numnodes(&p->p_wpage) != 0) 2490 tree = &p->p_wpage; 2491 else 2492 tree = &as->a_wpage; 2493 2494 mutex_exit(&p->p_lock); 2495 AS_LOCK_ENTER(as, &as->a_lock, RW_WRITER); 2496 2497 for (pwp = avl_first(tree); pwp != NULL; 2498 pwp = AVL_NEXT(tree, pwp)) { 2499 pwp->wp_read = 0; 2500 pwp->wp_write = 0; 2501 pwp->wp_exec = 0; 2502 if ((pwp->wp_flags & WP_SETPROT) == 0) { 2503 pwp->wp_flags |= WP_SETPROT; 2504 pwp->wp_prot = pwp->wp_oprot; 2505 pwp->wp_list = p->p_wprot; 2506 p->p_wprot = pwp; 2507 } 2508 } 2509 2510 AS_LOCK_EXIT(as, &as->a_lock); 2511 mutex_enter(&p->p_lock); 2512 } 2513 2514 /* 2515 * Unpause the process now. 2516 */ 2517 if (p == curproc) 2518 continuelwps(p); 2519 else 2520 unpauselwps(p); 2521 2522 return (p); 2523 } 2524
Indexes created Thu May 17 00:40:56 UTC 2012
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