sys/kern/imgact_elf.c

   1 /*-
   2  * Copyright (c) 2000 David O'Brien
   3  * Copyright (c) 1995-1996 Søren Schmidt
   4  * Copyright (c) 1996 Peter Wemm
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer
  12  *    in this position and unchanged.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. The name of the author may not be used to endorse or promote products
  17  *    derived from this software without specific prior written permission
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include <sys/cdefs.h>
  32 __FBSDID("$FreeBSD$");
  33
  34 #include "opt_capsicum.h"
  35 #include "opt_compat.h"
  36 #include "opt_core.h"
  37
  38 #include <sys/param.h>
  39 #include <sys/capsicum.h>
  40 #include <sys/exec.h>
  41 #include <sys/fcntl.h>
  42 #include <sys/imgact.h>
  43 #include <sys/imgact_elf.h>
  44 #include <sys/jail.h>
  45 #include <sys/kernel.h>
  46 #include <sys/lock.h>
  47 #include <sys/malloc.h>
  48 #include <sys/mount.h>
  49 #include <sys/mman.h>
  50 #include <sys/namei.h>
  51 #include <sys/pioctl.h>
  52 #include <sys/proc.h>
  53 #include <sys/procfs.h>
  54 #include <sys/racct.h>
  55 #include <sys/resourcevar.h>
  56 #include <sys/rwlock.h>
  57 #include <sys/sbuf.h>
  58 #include <sys/sf_buf.h>
  59 #include <sys/smp.h>
  60 #include <sys/systm.h>
  61 #include <sys/signalvar.h>
  62 #include <sys/stat.h>
  63 #include <sys/sx.h>
  64 #include <sys/syscall.h>
  65 #include <sys/sysctl.h>
  66 #include <sys/sysent.h>
  67 #include <sys/vnode.h>
  68 #include <sys/syslog.h>
  69 #include <sys/eventhandler.h>
  70 #include <sys/user.h>
  71
  72 #include <net/zlib.h>
  73
  74 #include <vm/vm.h>
  75 #include <vm/vm_kern.h>
  76 #include <vm/vm_param.h>
  77 #include <vm/pmap.h>
  78 #include <vm/vm_map.h>
  79 #include <vm/vm_object.h>
  80 #include <vm/vm_extern.h>
  81
  82 #include <machine/elf.h>
  83 #include <machine/md_var.h>
  84
  85 #define ELF_NOTE_ROUNDSIZE      4
  86 #define OLD_EI_BRAND    8
  87
  88 static int __elfN(check_header)(const Elf_Ehdr *hdr);
  89 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp,
  90     const char *interp, int interp_name_len, int32_t *osrel);
  91 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
  92     u_long *entry, size_t pagesize);
  93 static int __elfN(load_section)(struct image_params *imgp, vm_offset_t offset,
  94     caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
  95     size_t pagesize);
  96 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp);
  97 static boolean_t __elfN(freebsd_trans_osrel)(const Elf_Note *note,
  98     int32_t *osrel);
  99 static boolean_t kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel);
 100 static boolean_t __elfN(check_note)(struct image_params *imgp,
 101     Elf_Brandnote *checknote, int32_t *osrel);
 102 static vm_prot_t __elfN(trans_prot)(Elf_Word);
 103 static Elf_Word __elfN(untrans_prot)(vm_prot_t);
 104
 105 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0,
 106     "");
 107
 108 #ifdef COMPRESS_USER_CORES
 109 static int compress_core(gzFile, char *, char *, unsigned int,
 110     struct thread * td);
 111 #endif
 112 #define CORE_BUF_SIZE   (16 * 1024)
 113
 114 int __elfN(fallback_brand) = -1;
 115 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
 116     fallback_brand, CTLFLAG_RW, &__elfN(fallback_brand), 0,
 117     __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort");
 118 TUNABLE_INT("kern.elf" __XSTRING(__ELF_WORD_SIZE) ".fallback_brand",
 119     &__elfN(fallback_brand));
 120
 121 static int elf_legacy_coredump = 0;
 122 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW,
 123     &elf_legacy_coredump, 0, "");
 124
 125 int __elfN(nxstack) =
 126 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */
 127         1;
 128 #else
 129         0;
 130 #endif
 131 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
 132     nxstack, CTLFLAG_RW, &__elfN(nxstack), 0,
 133     __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack");
 134
 135 #if __ELF_WORD_SIZE == 32
 136 #if defined(__amd64__) || defined(__ia64__)
 137 int i386_read_exec = 0;
 138 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0,
 139     "enable execution from readable segments");
 140 #endif
 141 #endif
 142
 143 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS];
 144
 145 #define trunc_page_ps(va, ps)   ((va) & ~(ps - 1))
 146 #define round_page_ps(va, ps)   (((va) + (ps - 1)) & ~(ps - 1))
 147 #define aligned(a, t)   (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a))
 148
 149 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD";
 150
 151 Elf_Brandnote __elfN(freebsd_brandnote) = {
 152         .hdr.n_namesz   = sizeof(FREEBSD_ABI_VENDOR),
 153         .hdr.n_descsz   = sizeof(int32_t),
 154         .hdr.n_type     = 1,
 155         .vendor         = FREEBSD_ABI_VENDOR,
 156         .flags          = BN_TRANSLATE_OSREL,
 157         .trans_osrel    = __elfN(freebsd_trans_osrel)
 158 };
 159
 160 static boolean_t
 161 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel)
 162 {
 163         uintptr_t p;
 164
 165         p = (uintptr_t)(note + 1);
 166         p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
 167         *osrel = *(const int32_t *)(p);
 168
 169         return (TRUE);
 170 }
 171
 172 static const char GNU_ABI_VENDOR[] = "GNU";
 173 static int GNU_KFREEBSD_ABI_DESC = 3;
 174
 175 Elf_Brandnote __elfN(kfreebsd_brandnote) = {
 176         .hdr.n_namesz   = sizeof(GNU_ABI_VENDOR),
 177         .hdr.n_descsz   = 16,   /* XXX at least 16 */
 178         .hdr.n_type     = 1,
 179         .vendor         = GNU_ABI_VENDOR,
 180         .flags          = BN_TRANSLATE_OSREL,
 181         .trans_osrel    = kfreebsd_trans_osrel
 182 };
 183
 184 static boolean_t
 185 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel)
 186 {
 187         const Elf32_Word *desc;
 188         uintptr_t p;
 189
 190         p = (uintptr_t)(note + 1);
 191         p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
 192
 193         desc = (const Elf32_Word *)p;
 194         if (desc[0] != GNU_KFREEBSD_ABI_DESC)
 195                 return (FALSE);
 196
 197         /*
 198          * Debian GNU/kFreeBSD embed the earliest compatible kernel version
 199          * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way.
 200          */
 201         *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3];
 202
 203         return (TRUE);
 204 }
 205
 206 int
 207 __elfN(insert_brand_entry)(Elf_Brandinfo *entry)
 208 {
 209         int i;
 210
 211         for (i = 0; i < MAX_BRANDS; i++) {
 212                 if (elf_brand_list[i] == NULL) {
 213                         elf_brand_list[i] = entry;
 214                         break;
 215                 }
 216         }
 217         if (i == MAX_BRANDS) {
 218                 printf("WARNING: %s: could not insert brandinfo entry: %p\n",
 219                         __func__, entry);
 220                 return (-1);
 221         }
 222         return (0);
 223 }
 224
 225 int
 226 __elfN(remove_brand_entry)(Elf_Brandinfo *entry)
 227 {
 228         int i;
 229
 230         for (i = 0; i < MAX_BRANDS; i++) {
 231                 if (elf_brand_list[i] == entry) {
 232                         elf_brand_list[i] = NULL;
 233                         break;
 234                 }
 235         }
 236         if (i == MAX_BRANDS)
 237                 return (-1);
 238         return (0);
 239 }
 240
 241 int
 242 __elfN(brand_inuse)(Elf_Brandinfo *entry)
 243 {
 244         struct proc *p;
 245         int rval = FALSE;
 246
 247         sx_slock(&allproc_lock);
 248         FOREACH_PROC_IN_SYSTEM(p) {
 249                 if (p->p_sysent == entry->sysvec) {
 250                         rval = TRUE;
 251                         break;
 252                 }
 253         }
 254         sx_sunlock(&allproc_lock);
 255
 256         return (rval);
 257 }
 258
 259 static Elf_Brandinfo *
 260 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
 261     int interp_name_len, int32_t *osrel)
 262 {
 263         const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
 264         Elf_Brandinfo *bi, *bi_m;
 265         boolean_t ret;
 266         int i;
 267
 268         /*
 269          * We support four types of branding -- (1) the ELF EI_OSABI field
 270          * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
 271          * branding w/in the ELF header, (3) path of the `interp_path'
 272          * field, and (4) the ".note.ABI-tag" ELF section.
 273          */
 274
 275         /* Look for an ".note.ABI-tag" ELF section */
 276         bi_m = NULL;
 277         for (i = 0; i < MAX_BRANDS; i++) {
 278                 bi = elf_brand_list[i];
 279                 if (bi == NULL)
 280                         continue;
 281                 if (hdr->e_machine == bi->machine && (bi->flags &
 282                     (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
 283                         ret = __elfN(check_note)(imgp, bi->brand_note, osrel);
 284                         /*
 285                          * If note checker claimed the binary, but the
 286                          * interpreter path in the image does not
 287                          * match default one for the brand, try to
 288                          * search for other brands with the same
 289                          * interpreter.  Either there is better brand
 290                          * with the right interpreter, or, failing
 291                          * this, we return first brand which accepted
 292                          * our note and, optionally, header.
 293                          */
 294                         if (ret && bi_m == NULL && (strlen(bi->interp_path) +
 295                             1 != interp_name_len || strncmp(interp,
 296                             bi->interp_path, interp_name_len) != 0)) {
 297                                 bi_m = bi;
 298                                 ret = 0;
 299                         }
 300                         if (ret)
 301                                 return (bi);
 302                 }
 303         }
 304         if (bi_m != NULL)
 305                 return (bi_m);
 306
 307         /* If the executable has a brand, search for it in the brand list. */
 308         for (i = 0; i < MAX_BRANDS; i++) {
 309                 bi = elf_brand_list[i];
 310                 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
 311                         continue;
 312                 if (hdr->e_machine == bi->machine &&
 313                     (hdr->e_ident[EI_OSABI] == bi->brand ||
 314                     strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
 315                     bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0))
 316                         return (bi);
 317         }
 318
 319         /* Lacking a known brand, search for a recognized interpreter. */
 320         if (interp != NULL) {
 321                 for (i = 0; i < MAX_BRANDS; i++) {
 322                         bi = elf_brand_list[i];
 323                         if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
 324                                 continue;
 325                         if (hdr->e_machine == bi->machine &&
 326                             /* ELF image p_filesz includes terminating zero */
 327                             strlen(bi->interp_path) + 1 == interp_name_len &&
 328                             strncmp(interp, bi->interp_path, interp_name_len)
 329                             == 0)
 330                                 return (bi);
 331                 }
 332         }
 333
 334         /* Lacking a recognized interpreter, try the default brand */
 335         for (i = 0; i < MAX_BRANDS; i++) {
 336                 bi = elf_brand_list[i];
 337                 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
 338                         continue;
 339                 if (hdr->e_machine == bi->machine &&
 340                     __elfN(fallback_brand) == bi->brand)
 341                         return (bi);
 342         }
 343         return (NULL);
 344 }
 345
 346 static int
 347 __elfN(check_header)(const Elf_Ehdr *hdr)
 348 {
 349         Elf_Brandinfo *bi;
 350         int i;
 351
 352         if (!IS_ELF(*hdr) ||
 353             hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
 354             hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
 355             hdr->e_ident[EI_VERSION] != EV_CURRENT ||
 356             hdr->e_phentsize != sizeof(Elf_Phdr) ||
 357             hdr->e_version != ELF_TARG_VER)
 358                 return (ENOEXEC);
 359
 360         /*
 361          * Make sure we have at least one brand for this machine.
 362          */
 363
 364         for (i = 0; i < MAX_BRANDS; i++) {
 365                 bi = elf_brand_list[i];
 366                 if (bi != NULL && bi->machine == hdr->e_machine)
 367                         break;
 368         }
 369         if (i == MAX_BRANDS)
 370                 return (ENOEXEC);
 371
 372         return (0);
 373 }
 374
 375 static int
 376 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
 377     vm_offset_t start, vm_offset_t end, vm_prot_t prot)
 378 {
 379         struct sf_buf *sf;
 380         int error;
 381         vm_offset_t off;
 382
 383         /*
 384          * Create the page if it doesn't exist yet. Ignore errors.
 385          */
 386         vm_map_lock(map);
 387         vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end),
 388             VM_PROT_ALL, VM_PROT_ALL, 0);
 389         vm_map_unlock(map);
 390
 391         /*
 392          * Find the page from the underlying object.
 393          */
 394         if (object) {
 395                 sf = vm_imgact_map_page(object, offset);
 396                 if (sf == NULL)
 397                         return (KERN_FAILURE);
 398                 off = offset - trunc_page(offset);
 399                 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start,
 400                     end - start);
 401                 vm_imgact_unmap_page(sf);
 402                 if (error != 0)
 403                         return (KERN_FAILURE);
 404         }
 405
 406         return (KERN_SUCCESS);
 407 }
 408
 409 static int
 410 __elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
 411     vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow)
 412 {
 413         struct sf_buf *sf;
 414         vm_offset_t off;
 415         vm_size_t sz;
 416         int error, rv;
 417
 418         if (start != trunc_page(start)) {
 419                 rv = __elfN(map_partial)(map, object, offset, start,
 420                     round_page(start), prot);
 421                 if (rv)
 422                         return (rv);
 423                 offset += round_page(start) - start;
 424                 start = round_page(start);
 425         }
 426         if (end != round_page(end)) {
 427                 rv = __elfN(map_partial)(map, object, offset +
 428                     trunc_page(end) - start, trunc_page(end), end, prot);
 429                 if (rv)
 430                         return (rv);
 431                 end = trunc_page(end);
 432         }
 433         if (end > start) {
 434                 if (offset & PAGE_MASK) {
 435                         /*
 436                          * The mapping is not page aligned. This means we have
 437                          * to copy the data. Sigh.
 438                          */
 439                         rv = vm_map_find(map, NULL, 0, &start, end - start, 0,
 440                             VMFS_NO_SPACE, prot | VM_PROT_WRITE, VM_PROT_ALL,
 441                             0);
 442                         if (rv != KERN_SUCCESS)
 443                                 return (rv);
 444                         if (object == NULL)
 445                                 return (KERN_SUCCESS);
 446                         for (; start < end; start += sz) {
 447                                 sf = vm_imgact_map_page(object, offset);
 448                                 if (sf == NULL)
 449                                         return (KERN_FAILURE);
 450                                 off = offset - trunc_page(offset);
 451                                 sz = end - start;
 452                                 if (sz > PAGE_SIZE - off)
 453                                         sz = PAGE_SIZE - off;
 454                                 error = copyout((caddr_t)sf_buf_kva(sf) + off,
 455                                     (caddr_t)start, sz);
 456                                 vm_imgact_unmap_page(sf);
 457                                 if (error != 0)
 458                                         return (KERN_FAILURE);
 459                                 offset += sz;
 460                         }
 461                         rv = KERN_SUCCESS;
 462                 } else {
 463                         vm_object_reference(object);
 464                         vm_map_lock(map);
 465                         rv = vm_map_insert(map, object, offset, start, end,
 466                             prot, VM_PROT_ALL, cow);
 467                         vm_map_unlock(map);
 468                         if (rv != KERN_SUCCESS)
 469                                 vm_object_deallocate(object);
 470                 }
 471                 return (rv);
 472         } else {
 473                 return (KERN_SUCCESS);
 474         }
 475 }
 476
 477 static int
 478 __elfN(load_section)(struct image_params *imgp, vm_offset_t offset,
 479     caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
 480     size_t pagesize)
 481 {
 482         struct sf_buf *sf;
 483         size_t map_len;
 484         vm_map_t map;
 485         vm_object_t object;
 486         vm_offset_t map_addr;
 487         int error, rv, cow;
 488         size_t copy_len;
 489         vm_offset_t file_addr;
 490
 491         /*
 492          * It's necessary to fail if the filsz + offset taken from the
 493          * header is greater than the actual file pager object's size.
 494          * If we were to allow this, then the vm_map_find() below would
 495          * walk right off the end of the file object and into the ether.
 496          *
 497          * While I'm here, might as well check for something else that
 498          * is invalid: filsz cannot be greater than memsz.
 499          */
 500         if ((off_t)filsz + offset > imgp->attr->va_size || filsz > memsz) {
 501                 uprintf("elf_load_section: truncated ELF file\n");
 502                 return (ENOEXEC);
 503         }
 504
 505         object = imgp->object;
 506         map = &imgp->proc->p_vmspace->vm_map;
 507         map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize);
 508         file_addr = trunc_page_ps(offset, pagesize);
 509
 510         /*
 511          * We have two choices.  We can either clear the data in the last page
 512          * of an oversized mapping, or we can start the anon mapping a page
 513          * early and copy the initialized data into that first page.  We
 514          * choose the second..
 515          */
 516         if (memsz > filsz)
 517                 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr;
 518         else
 519                 map_len = round_page_ps(offset + filsz, pagesize) - file_addr;
 520
 521         if (map_len != 0) {
 522                 /* cow flags: don't dump readonly sections in core */
 523                 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
 524                     (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
 525
 526                 rv = __elfN(map_insert)(map,
 527                                       object,
 528                                       file_addr,        /* file offset */
 529                                       map_addr,         /* virtual start */
 530                                       map_addr + map_len,/* virtual end */
 531                                       prot,
 532                                       cow);
 533                 if (rv != KERN_SUCCESS)
 534                         return (EINVAL);
 535
 536                 /* we can stop now if we've covered it all */
 537                 if (memsz == filsz) {
 538                         return (0);
 539                 }
 540         }
 541
 542
 543         /*
 544          * We have to get the remaining bit of the file into the first part
 545          * of the oversized map segment.  This is normally because the .data
 546          * segment in the file is extended to provide bss.  It's a neat idea
 547          * to try and save a page, but it's a pain in the behind to implement.
 548          */
 549         copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize);
 550         map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize);
 551         map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) -
 552             map_addr;
 553
 554         /* This had damn well better be true! */
 555         if (map_len != 0) {
 556                 rv = __elfN(map_insert)(map, NULL, 0, map_addr, map_addr +
 557                     map_len, VM_PROT_ALL, 0);
 558                 if (rv != KERN_SUCCESS) {
 559                         return (EINVAL);
 560                 }
 561         }
 562
 563         if (copy_len != 0) {
 564                 vm_offset_t off;
 565
 566                 sf = vm_imgact_map_page(object, offset + filsz);
 567                 if (sf == NULL)
 568                         return (EIO);
 569
 570                 /* send the page fragment to user space */
 571                 off = trunc_page_ps(offset + filsz, pagesize) -
 572                     trunc_page(offset + filsz);
 573                 error = copyout((caddr_t)sf_buf_kva(sf) + off,
 574                     (caddr_t)map_addr, copy_len);
 575                 vm_imgact_unmap_page(sf);
 576                 if (error) {
 577                         return (error);
 578                 }
 579         }
 580
 581         /*
 582          * set it to the specified protection.
 583          * XXX had better undo the damage from pasting over the cracks here!
 584          */
 585         vm_map_protect(map, trunc_page(map_addr), round_page(map_addr +
 586             map_len), prot, FALSE);
 587
 588         return (0);
 589 }
 590
 591 /*
 592  * Load the file "file" into memory.  It may be either a shared object
 593  * or an executable.
 594  *
 595  * The "addr" reference parameter is in/out.  On entry, it specifies
 596  * the address where a shared object should be loaded.  If the file is
 597  * an executable, this value is ignored.  On exit, "addr" specifies
 598  * where the file was actually loaded.
 599  *
 600  * The "entry" reference parameter is out only.  On exit, it specifies
 601  * the entry point for the loaded file.
 602  */
 603 static int
 604 __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
 605         u_long *entry, size_t pagesize)
 606 {
 607         struct {
 608                 struct nameidata nd;
 609                 struct vattr attr;
 610                 struct image_params image_params;
 611         } *tempdata;
 612         const Elf_Ehdr *hdr = NULL;
 613         const Elf_Phdr *phdr = NULL;
 614         struct nameidata *nd;
 615         struct vattr *attr;
 616         struct image_params *imgp;
 617         vm_prot_t prot;
 618         u_long rbase;
 619         u_long base_addr = 0;
 620         int error, i, numsegs;
 621
 622 #ifdef CAPABILITY_MODE
 623         /*
 624          * XXXJA: This check can go away once we are sufficiently confident
 625          * that the checks in namei() are correct.
 626          */
 627         if (IN_CAPABILITY_MODE(curthread))
 628                 return (ECAPMODE);
 629 #endif
 630
 631         tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
 632         nd = &tempdata->nd;
 633         attr = &tempdata->attr;
 634         imgp = &tempdata->image_params;
 635
 636         /*
 637          * Initialize part of the common data
 638          */
 639         imgp->proc = p;
 640         imgp->attr = attr;
 641         imgp->firstpage = NULL;
 642         imgp->image_header = NULL;
 643         imgp->object = NULL;
 644         imgp->execlabel = NULL;
 645
 646         NDINIT(nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, curthread);
 647         if ((error = namei(nd)) != 0) {
 648                 nd->ni_vp = NULL;
 649                 goto fail;
 650         }
 651         NDFREE(nd, NDF_ONLY_PNBUF);
 652         imgp->vp = nd->ni_vp;
 653
 654         /*
 655          * Check permissions, modes, uid, etc on the file, and "open" it.
 656          */
 657         error = exec_check_permissions(imgp);
 658         if (error)
 659                 goto fail;
 660
 661         error = exec_map_first_page(imgp);
 662         if (error)
 663                 goto fail;
 664
 665         /*
 666          * Also make certain that the interpreter stays the same, so set
 667          * its VV_TEXT flag, too.
 668          */
 669         VOP_SET_TEXT(nd->ni_vp);
 670
 671         imgp->object = nd->ni_vp->v_object;
 672
 673         hdr = (const Elf_Ehdr *)imgp->image_header;
 674         if ((error = __elfN(check_header)(hdr)) != 0)
 675                 goto fail;
 676         if (hdr->e_type == ET_DYN)
 677                 rbase = *addr;
 678         else if (hdr->e_type == ET_EXEC)
 679                 rbase = 0;
 680         else {
 681                 error = ENOEXEC;
 682                 goto fail;
 683         }
 684
 685         /* Only support headers that fit within first page for now      */
 686         if ((hdr->e_phoff > PAGE_SIZE) ||
 687             (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
 688                 error = ENOEXEC;
 689                 goto fail;
 690         }
 691
 692         phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
 693         if (!aligned(phdr, Elf_Addr)) {
 694                 error = ENOEXEC;
 695                 goto fail;
 696         }
 697
 698         for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
 699                 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) {
 700                         /* Loadable segment */
 701                         prot = __elfN(trans_prot)(phdr[i].p_flags);
 702                         error = __elfN(load_section)(imgp, phdr[i].p_offset,
 703                             (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase,
 704                             phdr[i].p_memsz, phdr[i].p_filesz, prot, pagesize);
 705                         if (error != 0)
 706                                 goto fail;
 707                         /*
 708                          * Establish the base address if this is the
 709                          * first segment.
 710                          */
 711                         if (numsegs == 0)
 712                                 base_addr = trunc_page(phdr[i].p_vaddr +
 713                                     rbase);
 714                         numsegs++;
 715                 }
 716         }
 717         *addr = base_addr;
 718         *entry = (unsigned long)hdr->e_entry + rbase;
 719
 720 fail:
 721         if (imgp->firstpage)
 722                 exec_unmap_first_page(imgp);
 723
 724         if (nd->ni_vp)
 725                 vput(nd->ni_vp);
 726
 727         free(tempdata, M_TEMP);
 728
 729         return (error);
 730 }
 731
 732 static int
 733 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
 734 {
 735         struct thread *td;
 736         const Elf_Ehdr *hdr;
 737         const Elf_Phdr *phdr;
 738         Elf_Auxargs *elf_auxargs;
 739         struct vmspace *vmspace;
 740         const char *err_str, *newinterp;
 741         char *interp, *interp_buf, *path;
 742         Elf_Brandinfo *brand_info;
 743         struct sysentvec *sv;
 744         vm_prot_t prot;
 745         u_long text_size, data_size, total_size, text_addr, data_addr;
 746         u_long seg_size, seg_addr, addr, baddr, et_dyn_addr, entry, proghdr;
 747         int32_t osrel;
 748         int error, i, n, interp_name_len, have_interp;
 749
 750         hdr = (const Elf_Ehdr *)imgp->image_header;
 751
 752         /*
 753          * Do we have a valid ELF header ?
 754          *
 755          * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later
 756          * if particular brand doesn't support it.
 757          */
 758         if (__elfN(check_header)(hdr) != 0 ||
 759             (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
 760                 return (-1);
 761
 762         /*
 763          * From here on down, we return an errno, not -1, as we've
 764          * detected an ELF file.
 765          */
 766
 767         if ((hdr->e_phoff > PAGE_SIZE) ||
 768             (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
 769                 /* Only support headers in first page for now */
 770                 uprintf("Program headers not in the first page\n");
 771                 return (ENOEXEC);
 772         }
 773         phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
 774         if (!aligned(phdr, Elf_Addr)) {
 775                 uprintf("Unaligned program headers\n");
 776                 return (ENOEXEC);
 777         }
 778
 779         n = error = 0;
 780         baddr = 0;
 781         osrel = 0;
 782         text_size = data_size = total_size = text_addr = data_addr = 0;
 783         entry = proghdr = 0;
 784         interp_name_len = 0;
 785         err_str = newinterp = NULL;
 786         interp = interp_buf = NULL;
 787         td = curthread;
 788
 789         for (i = 0; i < hdr->e_phnum; i++) {
 790                 switch (phdr[i].p_type) {
 791                 case PT_LOAD:
 792                         if (n == 0)
 793                                 baddr = phdr[i].p_vaddr;
 794                         n++;
 795                         break;
 796                 case PT_INTERP:
 797                         /* Path to interpreter */
 798                         if (phdr[i].p_filesz < 2 ||
 799                             phdr[i].p_filesz > MAXPATHLEN) {
 800                                 uprintf("Invalid PT_INTERP\n");
 801                                 error = ENOEXEC;
 802                                 goto ret;
 803                         }
 804                         if (interp != NULL) {
 805                                 uprintf("Multiple PT_INTERP headers\n");
 806                                 error = ENOEXEC;
 807                                 goto ret;
 808                         }
 809                         interp_name_len = phdr[i].p_filesz;
 810                         if (phdr[i].p_offset > PAGE_SIZE ||
 811                             interp_name_len > PAGE_SIZE - phdr[i].p_offset) {
 812                                 VOP_UNLOCK(imgp->vp, 0);
 813                                 interp_buf = malloc(interp_name_len + 1, M_TEMP,
 814                                     M_WAITOK);
 815                                 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
 816                                 error = vn_rdwr(UIO_READ, imgp->vp, interp_buf,
 817                                     interp_name_len, phdr[i].p_offset,
 818                                     UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
 819                                     NOCRED, NULL, td);
 820                                 if (error != 0) {
 821                                         uprintf("i/o error PT_INTERP\n");
 822                                         goto ret;
 823                                 }
 824                                 interp_buf[interp_name_len] = '\0';
 825                                 interp = interp_buf;
 826                         } else {
 827                                 interp = __DECONST(char *, imgp->image_header) +
 828                                     phdr[i].p_offset;
 829                                 if (interp[interp_name_len - 1] != '\0') {
 830                                         uprintf("Invalid PT_INTERP\n");
 831                                         error = ENOEXEC;
 832                                         goto ret;
 833                                 }
 834                         }
 835                         break;
 836                 case PT_GNU_STACK:
 837                         if (__elfN(nxstack))
 838                                 imgp->stack_prot =
 839                                     __elfN(trans_prot)(phdr[i].p_flags);
 840                         imgp->stack_sz = phdr[i].p_memsz;
 841                         break;
 842                 }
 843         }
 844
 845         brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len,
 846             &osrel);
 847         if (brand_info == NULL) {
 848                 uprintf("ELF binary type \"%u\" not known.\n",
 849                     hdr->e_ident[EI_OSABI]);
 850                 error = ENOEXEC;
 851                 goto ret;
 852         }
 853         if (hdr->e_type == ET_DYN) {
 854                 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) {
 855                         uprintf("Cannot execute shared object\n");
 856                         error = ENOEXEC;
 857                         goto ret;
 858                 }
 859                 /*
 860                  * Honour the base load address from the dso if it is
 861                  * non-zero for some reason.
 862                  */
 863                 if (baddr == 0)
 864                         et_dyn_addr = ET_DYN_LOAD_ADDR;
 865                 else
 866                         et_dyn_addr = 0;
 867         } else
 868                 et_dyn_addr = 0;
 869         sv = brand_info->sysvec;
 870         if (interp != NULL && brand_info->interp_newpath != NULL)
 871                 newinterp = brand_info->interp_newpath;
 872
 873         /*
 874          * Avoid a possible deadlock if the current address space is destroyed
 875          * and that address space maps the locked vnode.  In the common case,
 876          * the locked vnode's v_usecount is decremented but remains greater
 877          * than zero.  Consequently, the vnode lock is not needed by vrele().
 878          * However, in cases where the vnode lock is external, such as nullfs,
 879          * v_usecount may become zero.
 880          *
 881          * The VV_TEXT flag prevents modifications to the executable while
 882          * the vnode is unlocked.
 883          */
 884         VOP_UNLOCK(imgp->vp, 0);
 885
 886         error = exec_new_vmspace(imgp, sv);
 887         imgp->proc->p_sysent = sv;
 888
 889         vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
 890         if (error != 0)
 891                 goto ret;
 892
 893         for (i = 0; i < hdr->e_phnum; i++) {
 894                 switch (phdr[i].p_type) {
 895                 case PT_LOAD:   /* Loadable segment */
 896                         if (phdr[i].p_memsz == 0)
 897                                 break;
 898                         prot = __elfN(trans_prot)(phdr[i].p_flags);
 899                         error = __elfN(load_section)(imgp, phdr[i].p_offset,
 900                             (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr,
 901                             phdr[i].p_memsz, phdr[i].p_filesz, prot,
 902                             sv->sv_pagesize);
 903                         if (error != 0)
 904                                 goto ret;
 905
 906                         /*
 907                          * If this segment contains the program headers,
 908                          * remember their virtual address for the AT_PHDR
 909                          * aux entry. Static binaries don't usually include
 910                          * a PT_PHDR entry.
 911                          */
 912                         if (phdr[i].p_offset == 0 &&
 913                             hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize
 914                                 <= phdr[i].p_filesz)
 915                                 proghdr = phdr[i].p_vaddr + hdr->e_phoff +
 916                                     et_dyn_addr;
 917
 918                         seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
 919                         seg_size = round_page(phdr[i].p_memsz +
 920                             phdr[i].p_vaddr + et_dyn_addr - seg_addr);
 921
 922                         /*
 923                          * Make the largest executable segment the official
 924                          * text segment and all others data.
 925                          *
 926                          * Note that obreak() assumes that data_addr +
 927                          * data_size == end of data load area, and the ELF
 928                          * file format expects segments to be sorted by
 929                          * address.  If multiple data segments exist, the
 930                          * last one will be used.
 931                          */
 932
 933                         if (phdr[i].p_flags & PF_X && text_size < seg_size) {
 934                                 text_size = seg_size;
 935                                 text_addr = seg_addr;
 936                         } else {
 937                                 data_size = seg_size;
 938                                 data_addr = seg_addr;
 939                         }
 940                         total_size += seg_size;
 941                         break;
 942                 case PT_PHDR:   /* Program header table info */
 943                         proghdr = phdr[i].p_vaddr + et_dyn_addr;
 944                         break;
 945                 default:
 946                         break;
 947                 }
 948         }
 949
 950         if (data_addr == 0 && data_size == 0) {
 951                 data_addr = text_addr;
 952                 data_size = text_size;
 953         }
 954
 955         entry = (u_long)hdr->e_entry + et_dyn_addr;
 956
 957         /*
 958          * Check limits.  It should be safe to check the
 959          * limits after loading the segments since we do
 960          * not actually fault in all the segments pages.
 961          */
 962         PROC_LOCK(imgp->proc);
 963         if (data_size > lim_cur(imgp->proc, RLIMIT_DATA))
 964                 err_str = "Data segment size exceeds process limit";
 965         else if (text_size > maxtsiz)
 966                 err_str = "Text segment size exceeds system limit";
 967         else if (total_size > lim_cur(imgp->proc, RLIMIT_VMEM))
 968                 err_str = "Total segment size exceeds process limit";
 969         else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0)
 970                 err_str = "Data segment size exceeds resource limit";
 971         else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0)
 972                 err_str = "Total segment size exceeds resource limit";
 973         if (err_str != NULL) {
 974                 PROC_UNLOCK(imgp->proc);
 975                 uprintf("%s\n", err_str);
 976                 error = ENOMEM;
 977                 goto ret;
 978         }
 979
 980         vmspace = imgp->proc->p_vmspace;
 981         vmspace->vm_tsize = text_size >> PAGE_SHIFT;
 982         vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
 983         vmspace->vm_dsize = data_size >> PAGE_SHIFT;
 984         vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
 985
 986         /*
 987          * We load the dynamic linker where a userland call
 988          * to mmap(0, ...) would put it.  The rationale behind this
 989          * calculation is that it leaves room for the heap to grow to
 990          * its maximum allowed size.
 991          */
 992         addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(imgp->proc,
 993             RLIMIT_DATA));
 994         PROC_UNLOCK(imgp->proc);
 995
 996         imgp->entry_addr = entry;
 997
 998         if (interp != NULL) {
 999                 have_interp = FALSE;
1000                 VOP_UNLOCK(imgp->vp, 0);
1001                 if (brand_info->emul_path != NULL &&
1002                     brand_info->emul_path[0] != '\0') {
1003                         path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1004                         snprintf(path, MAXPATHLEN, "%s%s",
1005                             brand_info->emul_path, interp);
1006                         error = __elfN(load_file)(imgp->proc, path, &addr,
1007                             &imgp->entry_addr, sv->sv_pagesize);
1008                         free(path, M_TEMP);
1009                         if (error == 0)
1010                                 have_interp = TRUE;
1011                 }
1012                 if (!have_interp && newinterp != NULL &&
1013                     (brand_info->interp_path == NULL ||
1014                     strcmp(interp, brand_info->interp_path) == 0)) {
1015                         error = __elfN(load_file)(imgp->proc, newinterp, &addr,
1016                             &imgp->entry_addr, sv->sv_pagesize);
1017                         if (error == 0)
1018                                 have_interp = TRUE;
1019                 }
1020                 if (!have_interp) {
1021                         error = __elfN(load_file)(imgp->proc, interp, &addr,
1022                             &imgp->entry_addr, sv->sv_pagesize);
1023                 }
1024                 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
1025                 if (error != 0) {
1026                         uprintf("ELF interpreter %s not found, error %d\n",
1027                             interp, error);
1028                         goto ret;
1029                 }
1030         } else
1031                 addr = et_dyn_addr;
1032
1033         /*
1034          * Construct auxargs table (used by the fixup routine)
1035          */
1036         elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
1037         elf_auxargs->execfd = -1;
1038         elf_auxargs->phdr = proghdr;
1039         elf_auxargs->phent = hdr->e_phentsize;
1040         elf_auxargs->phnum = hdr->e_phnum;
1041         elf_auxargs->pagesz = PAGE_SIZE;
1042         elf_auxargs->base = addr;
1043         elf_auxargs->flags = 0;
1044         elf_auxargs->entry = entry;
1045
1046         imgp->auxargs = elf_auxargs;
1047         imgp->interpreted = 0;
1048         imgp->reloc_base = addr;
1049         imgp->proc->p_osrel = osrel;
1050         imgp->proc->p_elf_machine = hdr->e_machine;
1051         imgp->proc->p_elf_flags = hdr->e_flags;
1052
1053  ret:
1054         free(interp_buf, M_TEMP);
1055         return (error);
1056 }
1057
1058 #define suword __CONCAT(suword, __ELF_WORD_SIZE)
1059
1060 int
1061 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp)
1062 {
1063         Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
1064         Elf_Addr *base;
1065         Elf_Addr *pos;
1066
1067         base = (Elf_Addr *)*stack_base;
1068         pos = base + (imgp->args->argc + imgp->args->envc + 2);
1069
1070         if (args->execfd != -1)
1071                 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
1072         AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
1073         AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
1074         AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
1075         AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
1076         AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
1077         AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
1078         AUXARGS_ENTRY(pos, AT_BASE, args->base);
1079         if (imgp->execpathp != 0)
1080                 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp);
1081         AUXARGS_ENTRY(pos, AT_OSRELDATE,
1082             imgp->proc->p_ucred->cr_prison->pr_osreldate);
1083         if (imgp->canary != 0) {
1084                 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary);
1085                 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen);
1086         }
1087         AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus);
1088         if (imgp->pagesizes != 0) {
1089                 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes);
1090                 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen);
1091         }
1092         if (imgp->sysent->sv_timekeep_base != 0) {
1093                 AUXARGS_ENTRY(pos, AT_TIMEKEEP,
1094                     imgp->sysent->sv_timekeep_base);
1095         }
1096         AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj
1097             != NULL && imgp->stack_prot != 0 ? imgp->stack_prot :
1098             imgp->sysent->sv_stackprot);
1099         AUXARGS_ENTRY(pos, AT_NULL, 0);
1100
1101         free(imgp->auxargs, M_TEMP);
1102         imgp->auxargs = NULL;
1103
1104         base--;
1105         suword(base, (long)imgp->args->argc);
1106         *stack_base = (register_t *)base;
1107         return (0);
1108 }
1109
1110 /*
1111  * Code for generating ELF core dumps.
1112  */
1113
1114 typedef void (*segment_callback)(vm_map_entry_t, void *);
1115
1116 /* Closure for cb_put_phdr(). */
1117 struct phdr_closure {
1118         Elf_Phdr *phdr;         /* Program header to fill in */
1119         Elf_Off offset;         /* Offset of segment in core file */
1120 };
1121
1122 /* Closure for cb_size_segment(). */
1123 struct sseg_closure {
1124         int count;              /* Count of writable segments. */
1125         size_t size;            /* Total size of all writable segments. */
1126 };
1127
1128 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *);
1129
1130 struct note_info {
1131         int             type;           /* Note type. */
1132         outfunc_t       outfunc;        /* Output function. */
1133         void            *outarg;        /* Argument for the output function. */
1134         size_t          outsize;        /* Output size. */
1135         TAILQ_ENTRY(note_info) link;    /* Link to the next note info. */
1136 };
1137
1138 TAILQ_HEAD(note_info_list, note_info);
1139
1140 static void cb_put_phdr(vm_map_entry_t, void *);
1141 static void cb_size_segment(vm_map_entry_t, void *);
1142 static void each_writable_segment(struct thread *, segment_callback, void *);
1143 static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *,
1144     int, void *, size_t, struct note_info_list *, size_t, gzFile);
1145 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *,
1146     size_t *);
1147 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t);
1148 static void __elfN(putnote)(struct note_info *, struct sbuf *);
1149 static size_t register_note(struct note_info_list *, int, outfunc_t, void *);
1150 static int sbuf_drain_core_output(void *, const char *, int);
1151 static int sbuf_drain_count(void *arg, const char *data, int len);
1152
1153 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *);
1154 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *);
1155 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *);
1156 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *);
1157 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *);
1158 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *);
1159 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *);
1160 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *);
1161 static void note_procstat_files(void *, struct sbuf *, size_t *);
1162 static void note_procstat_groups(void *, struct sbuf *, size_t *);
1163 static void note_procstat_osrel(void *, struct sbuf *, size_t *);
1164 static void note_procstat_rlimit(void *, struct sbuf *, size_t *);
1165 static void note_procstat_umask(void *, struct sbuf *, size_t *);
1166 static void note_procstat_vmmap(void *, struct sbuf *, size_t *);
1167
1168 #ifdef COMPRESS_USER_CORES
1169 extern int compress_user_cores;
1170 extern int compress_user_cores_gzlevel;
1171 #endif
1172
1173 static int
1174 core_output(struct vnode *vp, void *base, size_t len, off_t offset,
1175     struct ucred *active_cred, struct ucred *file_cred,
1176     struct thread *td, char *core_buf, gzFile gzfile) {
1177
1178         int error;
1179         if (gzfile) {
1180 #ifdef COMPRESS_USER_CORES
1181                 error = compress_core(gzfile, base, core_buf, len, td);
1182 #else
1183                 panic("shouldn't be here");
1184 #endif
1185         } else {
1186                 /*
1187                  * EFAULT is a non-fatal error that we can get, for example,
1188                  * if the segment is backed by a file but extends beyond its
1189                  * end.
1190                  */
1191                 error = vn_rdwr_inchunks(UIO_WRITE, vp, base, len, offset,
1192                     UIO_USERSPACE, IO_UNIT | IO_DIRECT, active_cred, file_cred,
1193                     NULL, td);
1194                 if (error == EFAULT) {
1195                         log(LOG_WARNING, "Failed to fully fault in a core file "
1196                             "segment at VA %p with size 0x%zx to be written at "
1197                             "offset 0x%jx for process %s\n", base, len, offset,
1198                             curproc->p_comm);
1199
1200                         /*
1201                          * Write a "real" zero byte at the end of the target
1202                          * region in the case this is the last segment.
1203                          * The intermediate space will be implicitly
1204                          * zero-filled.
1205                          */
1206                         error = vn_rdwr_inchunks(UIO_WRITE, vp,
1207                             __DECONST(void *, zero_region), 1, offset + len - 1,
1208                             UIO_SYSSPACE, IO_UNIT | IO_DIRECT, active_cred,
1209                             file_cred, NULL, td);
1210                 }
1211         }
1212         return (error);
1213 }
1214
1215 /* Coredump output parameters for sbuf drain routine. */
1216 struct sbuf_drain_core_params {
1217         off_t           offset;
1218         struct ucred    *active_cred;
1219         struct ucred    *file_cred;
1220         struct thread   *td;
1221         struct vnode    *vp;
1222 #ifdef COMPRESS_USER_CORES
1223         gzFile          gzfile;
1224 #endif
1225 };
1226
1227 /*
1228  * Drain into a core file.
1229  */
1230 static int
1231 sbuf_drain_core_output(void *arg, const char *data, int len)
1232 {
1233         struct sbuf_drain_core_params *p;
1234         int error, locked;
1235
1236         p = (struct sbuf_drain_core_params *)arg;
1237
1238         /*
1239          * Some kern_proc out routines that print to this sbuf may
1240          * call us with the process lock held. Draining with the
1241          * non-sleepable lock held is unsafe. The lock is needed for
1242          * those routines when dumping a live process. In our case we
1243          * can safely release the lock before draining and acquire
1244          * again after.
1245          */
1246         locked = PROC_LOCKED(p->td->td_proc);
1247         if (locked)
1248                 PROC_UNLOCK(p->td->td_proc);
1249 #ifdef COMPRESS_USER_CORES
1250         if (p->gzfile != Z_NULL)
1251                 error = compress_core(p->gzfile, NULL, __DECONST(char *, data),
1252                     len, p->td);
1253         else
1254 #endif
1255                 error = vn_rdwr_inchunks(UIO_WRITE, p->vp,
1256                     __DECONST(void *, data), len, p->offset, UIO_SYSSPACE,
1257                     IO_UNIT | IO_DIRECT, p->active_cred, p->file_cred, NULL,
1258                     p->td);
1259         if (locked)
1260                 PROC_LOCK(p->td->td_proc);
1261         if (error != 0)
1262                 return (-error);
1263         p->offset += len;
1264         return (len);
1265 }
1266
1267 /*
1268  * Drain into a counter.
1269  */
1270 static int
1271 sbuf_drain_count(void *arg, const char *data __unused, int len)
1272 {
1273         size_t *sizep;
1274
1275         sizep = (size_t *)arg;
1276         *sizep += len;
1277         return (len);
1278 }
1279
1280 int
1281 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags)
1282 {
1283         struct ucred *cred = td->td_ucred;
1284         int error = 0;
1285         struct sseg_closure seginfo;
1286         struct note_info_list notelst;
1287         struct note_info *ninfo;
1288         void *hdr;
1289         size_t hdrsize, notesz, coresize;
1290
1291         gzFile gzfile = Z_NULL;
1292         char *core_buf = NULL;
1293 #ifdef COMPRESS_USER_CORES
1294         char gzopen_flags[8];
1295         char *p;
1296         int doing_compress = flags & IMGACT_CORE_COMPRESS;
1297 #endif
1298
1299         hdr = NULL;
1300         TAILQ_INIT(&notelst);
1301
1302 #ifdef COMPRESS_USER_CORES
1303         if (doing_compress) {
1304                 p = gzopen_flags;
1305                 *p++ = 'w';
1306                 if (compress_user_cores_gzlevel >= 0 &&
1307                     compress_user_cores_gzlevel <= 9)
1308                         *p++ = '0' + compress_user_cores_gzlevel;
1309                 *p = 0;
1310                 gzfile = gz_open("", gzopen_flags, vp);
1311                 if (gzfile == Z_NULL) {
1312                         error = EFAULT;
1313                         goto done;
1314                 }
1315                 core_buf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO);
1316                 if (!core_buf) {
1317                         error = ENOMEM;
1318                         goto done;
1319                 }
1320         }
1321 #endif
1322
1323         /* Size the program segments. */
1324         seginfo.count = 0;
1325         seginfo.size = 0;
1326         each_writable_segment(td, cb_size_segment, &seginfo);
1327
1328         /*
1329          * Collect info about the core file header area.
1330          */
1331         hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count);
1332         __elfN(prepare_notes)(td, &notelst, &notesz);
1333         coresize = round_page(hdrsize + notesz) + seginfo.size;
1334
1335 #ifdef RACCT
1336         if (racct_enable) {
1337                 PROC_LOCK(td->td_proc);
1338                 error = racct_add(td->td_proc, RACCT_CORE, coresize);
1339                 PROC_UNLOCK(td->td_proc);
1340                 if (error != 0) {
1341                         error = EFAULT;
1342                         goto done;
1343                 }
1344         }
1345 #endif
1346         if (coresize >= limit) {
1347                 error = EFAULT;
1348                 goto done;
1349         }
1350
1351         /*
1352          * Allocate memory for building the header, fill it up,
1353          * and write it out following the notes.
1354          */
1355         hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
1356         error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize,
1357             &notelst, notesz, gzfile);
1358
1359         /* Write the contents of all of the writable segments. */
1360         if (error == 0) {
1361                 Elf_Phdr *php;
1362                 off_t offset;
1363                 int i;
1364
1365                 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
1366                 offset = round_page(hdrsize + notesz);
1367                 for (i = 0; i < seginfo.count; i++) {
1368                         error = core_output(vp, (caddr_t)(uintptr_t)php->p_vaddr,
1369                             php->p_filesz, offset, cred, NOCRED, curthread, core_buf, gzfile);
1370                         if (error != 0)
1371                                 break;
1372                         offset += php->p_filesz;
1373                         php++;
1374                 }
1375         }
1376         if (error) {
1377                 log(LOG_WARNING,
1378                     "Failed to write core file for process %s (error %d)\n",
1379                     curproc->p_comm, error);
1380         }
1381
1382 done:
1383 #ifdef COMPRESS_USER_CORES
1384         if (core_buf)
1385                 free(core_buf, M_TEMP);
1386         if (gzfile)
1387                 gzclose(gzfile);
1388 #endif
1389         while ((ninfo = TAILQ_FIRST(&notelst)) != NULL) {
1390                 TAILQ_REMOVE(&notelst, ninfo, link);
1391                 free(ninfo, M_TEMP);
1392         }
1393         if (hdr != NULL)
1394                 free(hdr, M_TEMP);
1395
1396         return (error);
1397 }
1398
1399 /*
1400  * A callback for each_writable_segment() to write out the segment's
1401  * program header entry.
1402  */
1403 static void
1404 cb_put_phdr(entry, closure)
1405         vm_map_entry_t entry;
1406         void *closure;
1407 {
1408         struct phdr_closure *phc = (struct phdr_closure *)closure;
1409         Elf_Phdr *phdr = phc->phdr;
1410
1411         phc->offset = round_page(phc->offset);
1412
1413         phdr->p_type = PT_LOAD;
1414         phdr->p_offset = phc->offset;
1415         phdr->p_vaddr = entry->start;
1416         phdr->p_paddr = 0;
1417         phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1418         phdr->p_align = PAGE_SIZE;
1419         phdr->p_flags = __elfN(untrans_prot)(entry->protection);
1420
1421         phc->offset += phdr->p_filesz;
1422         phc->phdr++;
1423 }
1424
1425 /*
1426  * A callback for each_writable_segment() to gather information about
1427  * the number of segments and their total size.
1428  */
1429 static void
1430 cb_size_segment(entry, closure)
1431         vm_map_entry_t entry;
1432         void *closure;
1433 {
1434         struct sseg_closure *ssc = (struct sseg_closure *)closure;
1435
1436         ssc->count++;
1437         ssc->size += entry->end - entry->start;
1438 }
1439
1440 /*
1441  * For each writable segment in the process's memory map, call the given
1442  * function with a pointer to the map entry and some arbitrary
1443  * caller-supplied data.
1444  */
1445 static void
1446 each_writable_segment(td, func, closure)
1447         struct thread *td;
1448         segment_callback func;
1449         void *closure;
1450 {
1451         struct proc *p = td->td_proc;
1452         vm_map_t map = &p->p_vmspace->vm_map;
1453         vm_map_entry_t entry;
1454         vm_object_t backing_object, object;
1455         boolean_t ignore_entry;
1456
1457         vm_map_lock_read(map);
1458         for (entry = map->header.next; entry != &map->header;
1459             entry = entry->next) {
1460                 /*
1461                  * Don't dump inaccessible mappings, deal with legacy
1462                  * coredump mode.
1463                  *
1464                  * Note that read-only segments related to the elf binary
1465                  * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1466                  * need to arbitrarily ignore such segments.
1467                  */
1468                 if (elf_legacy_coredump) {
1469                         if ((entry->protection & VM_PROT_RW) != VM_PROT_RW)
1470                                 continue;
1471                 } else {
1472                         if ((entry->protection & VM_PROT_ALL) == 0)
1473                                 continue;
1474                 }
1475
1476                 /*
1477                  * Dont include memory segment in the coredump if
1478                  * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1479                  * madvise(2).  Do not dump submaps (i.e. parts of the
1480                  * kernel map).
1481                  */
1482                 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP))
1483                         continue;
1484
1485                 if ((object = entry->object.vm_object) == NULL)
1486                         continue;
1487
1488                 /* Ignore memory-mapped devices and such things. */
1489                 VM_OBJECT_RLOCK(object);
1490                 while ((backing_object = object->backing_object) != NULL) {
1491                         VM_OBJECT_RLOCK(backing_object);
1492                         VM_OBJECT_RUNLOCK(object);
1493                         object = backing_object;
1494                 }
1495                 ignore_entry = object->type != OBJT_DEFAULT &&
1496                     object->type != OBJT_SWAP && object->type != OBJT_VNODE &&
1497                     object->type != OBJT_PHYS;
1498                 VM_OBJECT_RUNLOCK(object);
1499                 if (ignore_entry)
1500                         continue;
1501
1502                 (*func)(entry, closure);
1503         }
1504         vm_map_unlock_read(map);
1505 }
1506
1507 /*
1508  * Write the core file header to the file, including padding up to
1509  * the page boundary.
1510  */
1511 static int
1512 __elfN(corehdr)(struct thread *td, struct vnode *vp, struct ucred *cred,
1513     int numsegs, void *hdr, size_t hdrsize, struct note_info_list *notelst,
1514     size_t notesz, gzFile gzfile)
1515 {
1516         struct sbuf_drain_core_params params;
1517         struct note_info *ninfo;
1518         struct sbuf *sb;
1519         int error;
1520
1521         /* Fill in the header. */
1522         bzero(hdr, hdrsize);
1523         __elfN(puthdr)(td, hdr, hdrsize, numsegs, notesz);
1524
1525         params.offset = 0;
1526         params.active_cred = cred;
1527         params.file_cred = NOCRED;
1528         params.td = td;
1529         params.vp = vp;
1530 #ifdef COMPRESS_USER_CORES
1531         params.gzfile = gzfile;
1532 #endif
1533         sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN);
1534         sbuf_set_drain(sb, sbuf_drain_core_output, &params);
1535         sbuf_start_section(sb, NULL);
1536         sbuf_bcat(sb, hdr, hdrsize);
1537         TAILQ_FOREACH(ninfo, notelst, link)
1538             __elfN(putnote)(ninfo, sb);
1539         /* Align up to a page boundary for the program segments. */
1540         sbuf_end_section(sb, -1, PAGE_SIZE, 0);
1541         error = sbuf_finish(sb);
1542         sbuf_delete(sb);
1543
1544         return (error);
1545 }
1546
1547 static void
1548 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list,
1549     size_t *sizep)
1550 {
1551         struct proc *p;
1552         struct thread *thr;
1553         size_t size;
1554
1555         p = td->td_proc;
1556         size = 0;
1557
1558         size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p);
1559
1560         /*
1561          * To have the debugger select the right thread (LWP) as the initial
1562          * thread, we dump the state of the thread passed to us in td first.
1563          * This is the thread that causes the core dump and thus likely to
1564          * be the right thread one wants to have selected in the debugger.
1565          */
1566         thr = td;
1567         while (thr != NULL) {
1568                 size += register_note(list, NT_PRSTATUS,
1569                     __elfN(note_prstatus), thr);
1570                 size += register_note(list, NT_FPREGSET,
1571                     __elfN(note_fpregset), thr);
1572                 size += register_note(list, NT_THRMISC,
1573                     __elfN(note_thrmisc), thr);
1574                 size += register_note(list, -1,
1575                     __elfN(note_threadmd), thr);
1576
1577                 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) :
1578                     TAILQ_NEXT(thr, td_plist);
1579                 if (thr == td)
1580                         thr = TAILQ_NEXT(thr, td_plist);
1581         }
1582
1583         size += register_note(list, NT_PROCSTAT_PROC,
1584             __elfN(note_procstat_proc), p);
1585         size += register_note(list, NT_PROCSTAT_FILES,
1586             note_procstat_files, p);
1587         size += register_note(list, NT_PROCSTAT_VMMAP,
1588             note_procstat_vmmap, p);
1589         size += register_note(list, NT_PROCSTAT_GROUPS,
1590             note_procstat_groups, p);
1591         size += register_note(list, NT_PROCSTAT_UMASK,
1592             note_procstat_umask, p);
1593         size += register_note(list, NT_PROCSTAT_RLIMIT,
1594             note_procstat_rlimit, p);
1595         size += register_note(list, NT_PROCSTAT_OSREL,
1596             note_procstat_osrel, p);
1597         size += register_note(list, NT_PROCSTAT_PSSTRINGS,
1598             __elfN(note_procstat_psstrings), p);
1599         size += register_note(list, NT_PROCSTAT_AUXV,
1600             __elfN(note_procstat_auxv), p);
1601
1602         *sizep = size;
1603 }
1604
1605 static void
1606 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs,
1607     size_t notesz)
1608 {
1609         Elf_Ehdr *ehdr;
1610         Elf_Phdr *phdr;
1611         struct phdr_closure phc;
1612
1613         ehdr = (Elf_Ehdr *)hdr;
1614         phdr = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr));
1615
1616         ehdr->e_ident[EI_MAG0] = ELFMAG0;
1617         ehdr->e_ident[EI_MAG1] = ELFMAG1;
1618         ehdr->e_ident[EI_MAG2] = ELFMAG2;
1619         ehdr->e_ident[EI_MAG3] = ELFMAG3;
1620         ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1621         ehdr->e_ident[EI_DATA] = ELF_DATA;
1622         ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1623         ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
1624         ehdr->e_ident[EI_ABIVERSION] = 0;
1625         ehdr->e_ident[EI_PAD] = 0;
1626         ehdr->e_type = ET_CORE;
1627         ehdr->e_machine = td->td_proc->p_elf_machine;
1628         ehdr->e_version = EV_CURRENT;
1629         ehdr->e_entry = 0;
1630         ehdr->e_phoff = sizeof(Elf_Ehdr);
1631         ehdr->e_flags = td->td_proc->p_elf_flags;
1632         ehdr->e_ehsize = sizeof(Elf_Ehdr);
1633         ehdr->e_phentsize = sizeof(Elf_Phdr);
1634         ehdr->e_phnum = numsegs + 1;
1635         ehdr->e_shentsize = sizeof(Elf_Shdr);
1636         ehdr->e_shnum = 0;
1637         ehdr->e_shstrndx = SHN_UNDEF;
1638
1639         /*
1640          * Fill in the program header entries.
1641          */
1642
1643         /* The note segement. */
1644         phdr->p_type = PT_NOTE;
1645         phdr->p_offset = hdrsize;
1646         phdr->p_vaddr = 0;
1647         phdr->p_paddr = 0;
1648         phdr->p_filesz = notesz;
1649         phdr->p_memsz = 0;
1650         phdr->p_flags = PF_R;
1651         phdr->p_align = ELF_NOTE_ROUNDSIZE;
1652         phdr++;
1653
1654         /* All the writable segments from the program. */
1655         phc.phdr = phdr;
1656         phc.offset = round_page(hdrsize + notesz);
1657         each_writable_segment(td, cb_put_phdr, &phc);
1658 }
1659
1660 static size_t
1661 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg)
1662 {
1663         struct note_info *ninfo;
1664         size_t size, notesize;
1665
1666         size = 0;
1667         out(arg, NULL, &size);
1668         ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK);
1669         ninfo->type = type;
1670         ninfo->outfunc = out;
1671         ninfo->outarg = arg;
1672         ninfo->outsize = size;
1673         TAILQ_INSERT_TAIL(list, ninfo, link);
1674
1675         if (type == -1)
1676                 return (size);
1677
1678         notesize = sizeof(Elf_Note) +           /* note header */
1679             roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
1680                                                 /* note name */
1681             roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
1682
1683         return (notesize);
1684 }
1685
1686 static size_t
1687 append_note_data(const void *src, void *dst, size_t len)
1688 {
1689         size_t padded_len;
1690
1691         padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE);
1692         if (dst != NULL) {
1693                 bcopy(src, dst, len);
1694                 bzero((char *)dst + len, padded_len - len);
1695         }
1696         return (padded_len);
1697 }
1698
1699 size_t
1700 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp)
1701 {
1702         Elf_Note *note;
1703         char *buf;
1704         size_t notesize;
1705
1706         buf = dst;
1707         if (buf != NULL) {
1708                 note = (Elf_Note *)buf;
1709                 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR);
1710                 note->n_descsz = size;
1711                 note->n_type = type;
1712                 buf += sizeof(*note);
1713                 buf += append_note_data(FREEBSD_ABI_VENDOR, buf,
1714                     sizeof(FREEBSD_ABI_VENDOR));
1715                 append_note_data(src, buf, size);
1716                 if (descp != NULL)
1717                         *descp = buf;
1718         }
1719
1720         notesize = sizeof(Elf_Note) +           /* note header */
1721             roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
1722                                                 /* note name */
1723             roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
1724
1725         return (notesize);
1726 }
1727
1728 static void
1729 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb)
1730 {
1731         Elf_Note note;
1732         ssize_t old_len, sect_len;
1733         size_t new_len, descsz, i;
1734
1735         if (ninfo->type == -1) {
1736                 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
1737                 return;
1738         }
1739
1740         note.n_namesz = sizeof(FREEBSD_ABI_VENDOR);
1741         note.n_descsz = ninfo->outsize;
1742         note.n_type = ninfo->type;
1743
1744         sbuf_bcat(sb, &note, sizeof(note));
1745         sbuf_start_section(sb, &old_len);
1746         sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR));
1747         sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
1748         if (note.n_descsz == 0)
1749                 return;
1750         sbuf_start_section(sb, &old_len);
1751         ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
1752         sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
1753         if (sect_len < 0)
1754                 return;
1755
1756         new_len = (size_t)sect_len;
1757         descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE);
1758         if (new_len < descsz) {
1759                 /*
1760                  * It is expected that individual note emitters will correctly
1761                  * predict their expected output size and fill up to that size
1762                  * themselves, padding in a format-specific way if needed.
1763                  * However, in case they don't, just do it here with zeros.
1764                  */
1765                 for (i = 0; i < descsz - new_len; i++)
1766                         sbuf_putc(sb, 0);
1767         } else if (new_len > descsz) {
1768                 /*
1769                  * We can't always truncate sb -- we may have drained some
1770                  * of it already.
1771                  */
1772                 KASSERT(new_len == descsz, ("%s: Note type %u changed as we "
1773                     "read it (%zu > %zu).  Since it is longer than "
1774                     "expected, this coredump's notes are corrupt.  THIS "
1775                     "IS A BUG in the note_procstat routine for type %u.\n",
1776                     __func__, (unsigned)note.n_type, new_len, descsz,
1777                     (unsigned)note.n_type));
1778         }
1779 }
1780
1781 /*
1782  * Miscellaneous note out functions.
1783  */
1784
1785 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1786 #include <compat/freebsd32/freebsd32.h>
1787
1788 typedef struct prstatus32 elf_prstatus_t;
1789 typedef struct prpsinfo32 elf_prpsinfo_t;
1790 typedef struct fpreg32 elf_prfpregset_t;
1791 typedef struct fpreg32 elf_fpregset_t;
1792 typedef struct reg32 elf_gregset_t;
1793 typedef struct thrmisc32 elf_thrmisc_t;
1794 #define ELF_KERN_PROC_MASK      KERN_PROC_MASK32
1795 typedef struct kinfo_proc32 elf_kinfo_proc_t;
1796 typedef uint32_t elf_ps_strings_t;
1797 #else
1798 typedef prstatus_t elf_prstatus_t;
1799 typedef prpsinfo_t elf_prpsinfo_t;
1800 typedef prfpregset_t elf_prfpregset_t;
1801 typedef prfpregset_t elf_fpregset_t;
1802 typedef gregset_t elf_gregset_t;
1803 typedef thrmisc_t elf_thrmisc_t;
1804 #define ELF_KERN_PROC_MASK      0
1805 typedef struct kinfo_proc elf_kinfo_proc_t;
1806 typedef vm_offset_t elf_ps_strings_t;
1807 #endif
1808
1809 static void
1810 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep)
1811 {
1812         struct sbuf sbarg;
1813         size_t len;
1814         char *cp, *end;
1815         struct proc *p;
1816         elf_prpsinfo_t *psinfo;
1817         int error;
1818
1819         p = (struct proc *)arg;
1820         if (sb != NULL) {
1821                 KASSERT(*sizep == sizeof(*psinfo), ("invalid size"));
1822                 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK);
1823                 psinfo->pr_version = PRPSINFO_VERSION;
1824                 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t);
1825                 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
1826                 PROC_LOCK(p);
1827                 if (p->p_args != NULL) {
1828                         len = sizeof(psinfo->pr_psargs) - 1;
1829                         if (len > p->p_args->ar_length)
1830                                 len = p->p_args->ar_length;
1831                         memcpy(psinfo->pr_psargs, p->p_args->ar_args, len);
1832                         PROC_UNLOCK(p);
1833                         error = 0;
1834                 } else {
1835                         _PHOLD(p);
1836                         PROC_UNLOCK(p);
1837                         sbuf_new(&sbarg, psinfo->pr_psargs,
1838                             sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN);
1839                         error = proc_getargv(curthread, p, &sbarg);
1840                         PRELE(p);
1841                         if (sbuf_finish(&sbarg) == 0)
1842                                 len = sbuf_len(&sbarg) - 1;
1843                         else
1844                                 len = sizeof(psinfo->pr_psargs) - 1;
1845                         sbuf_delete(&sbarg);
1846                 }
1847                 if (error || len == 0)
1848                         strlcpy(psinfo->pr_psargs, p->p_comm,
1849                             sizeof(psinfo->pr_psargs));
1850                 else {
1851                         KASSERT(len < sizeof(psinfo->pr_psargs),
1852                             ("len is too long: %zu vs %zu", len,
1853                             sizeof(psinfo->pr_psargs)));
1854                         cp = psinfo->pr_psargs;
1855                         end = cp + len - 1;
1856                         for (;;) {
1857                                 cp = memchr(cp, '\0', end - cp);
1858                                 if (cp == NULL)
1859                                         break;
1860                                 *cp = ' ';
1861                         }
1862                 }
1863                 psinfo->pr_pid = p->p_pid;
1864                 sbuf_bcat(sb, psinfo, sizeof(*psinfo));
1865                 free(psinfo, M_TEMP);
1866         }
1867         *sizep = sizeof(*psinfo);
1868 }
1869
1870 static void
1871 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep)
1872 {
1873         struct thread *td;
1874         elf_prstatus_t *status;
1875
1876         td = (struct thread *)arg;
1877         if (sb != NULL) {
1878                 KASSERT(*sizep == sizeof(*status), ("invalid size"));
1879                 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK);
1880                 status->pr_version = PRSTATUS_VERSION;
1881                 status->pr_statussz = sizeof(elf_prstatus_t);
1882                 status->pr_gregsetsz = sizeof(elf_gregset_t);
1883                 status->pr_fpregsetsz = sizeof(elf_fpregset_t);
1884                 status->pr_osreldate = osreldate;
1885                 status->pr_cursig = td->td_proc->p_sig;
1886                 status->pr_pid = td->td_tid;
1887 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1888                 fill_regs32(td, &status->pr_reg);
1889 #else
1890                 fill_regs(td, &status->pr_reg);
1891 #endif
1892                 sbuf_bcat(sb, status, sizeof(*status));
1893                 free(status, M_TEMP);
1894         }
1895         *sizep = sizeof(*status);
1896 }
1897
1898 static void
1899 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep)
1900 {
1901         struct thread *td;
1902         elf_prfpregset_t *fpregset;
1903
1904         td = (struct thread *)arg;
1905         if (sb != NULL) {
1906                 KASSERT(*sizep == sizeof(*fpregset), ("invalid size"));
1907                 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK);
1908 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1909                 fill_fpregs32(td, fpregset);
1910 #else
1911                 fill_fpregs(td, fpregset);
1912 #endif
1913                 sbuf_bcat(sb, fpregset, sizeof(*fpregset));
1914                 free(fpregset, M_TEMP);
1915         }
1916         *sizep = sizeof(*fpregset);
1917 }
1918
1919 static void
1920 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep)
1921 {
1922         struct thread *td;
1923         elf_thrmisc_t thrmisc;
1924
1925         td = (struct thread *)arg;
1926         if (sb != NULL) {
1927                 KASSERT(*sizep == sizeof(thrmisc), ("invalid size"));
1928                 bzero(&thrmisc._pad, sizeof(thrmisc._pad));
1929                 strcpy(thrmisc.pr_tname, td->td_name);
1930                 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc));
1931         }
1932         *sizep = sizeof(thrmisc);
1933 }
1934
1935 /*
1936  * Allow for MD specific notes, as well as any MD
1937  * specific preparations for writing MI notes.
1938  */
1939 static void
1940 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep)
1941 {
1942         struct thread *td;
1943         void *buf;
1944         size_t size;
1945
1946         td = (struct thread *)arg;
1947         size = *sizep;
1948         if (size != 0 && sb != NULL)
1949                 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK);
1950         else
1951                 buf = NULL;
1952         size = 0;
1953         __elfN(dump_thread)(td, buf, &size);
1954         KASSERT(sb == NULL || *sizep == size, ("invalid size"));
1955         if (size != 0 && sb != NULL)
1956                 sbuf_bcat(sb, buf, size);
1957         free(buf, M_TEMP);
1958         *sizep = size;
1959 }
1960
1961 #ifdef KINFO_PROC_SIZE
1962 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
1963 #endif
1964
1965 static void
1966 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep)
1967 {
1968         struct proc *p;
1969         size_t size;
1970         int structsize;
1971
1972         p = (struct proc *)arg;
1973         size = sizeof(structsize) + p->p_numthreads *
1974             sizeof(elf_kinfo_proc_t);
1975
1976         if (sb != NULL) {
1977                 KASSERT(*sizep == size, ("invalid size"));
1978                 structsize = sizeof(elf_kinfo_proc_t);
1979                 sbuf_bcat(sb, &structsize, sizeof(structsize));
1980                 PROC_LOCK(p);
1981                 kern_proc_out(p, sb, ELF_KERN_PROC_MASK);
1982         }
1983         *sizep = size;
1984 }
1985
1986 #ifdef KINFO_FILE_SIZE
1987 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE);
1988 #endif
1989
1990 static void
1991 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep)
1992 {
1993         struct proc *p;
1994         size_t size, sect_sz, i;
1995         ssize_t start_len, sect_len;
1996         int structsize, filedesc_flags;
1997
1998         if (coredump_pack_fileinfo)
1999                 filedesc_flags = KERN_FILEDESC_PACK_KINFO;
2000         else
2001                 filedesc_flags = 0;
2002
2003         p = (struct proc *)arg;
2004         structsize = sizeof(struct kinfo_file);
2005         if (sb == NULL) {
2006                 size = 0;
2007                 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2008                 sbuf_set_drain(sb, sbuf_drain_count, &size);
2009                 sbuf_bcat(sb, &structsize, sizeof(structsize));
2010                 PROC_LOCK(p);
2011                 kern_proc_filedesc_out(p, sb, -1, filedesc_flags);
2012                 sbuf_finish(sb);
2013                 sbuf_delete(sb);
2014                 *sizep = size;
2015         } else {
2016                 sbuf_start_section(sb, &start_len);
2017
2018                 sbuf_bcat(sb, &structsize, sizeof(structsize));
2019                 PROC_LOCK(p);
2020                 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize),
2021                     filedesc_flags);
2022
2023                 sect_len = sbuf_end_section(sb, start_len, 0, 0);
2024                 if (sect_len < 0)
2025                         return;
2026                 sect_sz = sect_len;
2027
2028                 KASSERT(sect_sz <= *sizep,
2029                     ("kern_proc_filedesc_out did not respect maxlen; "
2030                      "requested %zu, got %zu", *sizep - sizeof(structsize),
2031                      sect_sz - sizeof(structsize)));
2032
2033                 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++)
2034                         sbuf_putc(sb, 0);
2035         }
2036 }
2037
2038 #ifdef KINFO_VMENTRY_SIZE
2039 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE);
2040 #endif
2041
2042 static void
2043 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep)
2044 {
2045         struct proc *p;
2046         size_t size;
2047         int structsize, vmmap_flags;
2048
2049         if (coredump_pack_vmmapinfo)
2050                 vmmap_flags = KERN_VMMAP_PACK_KINFO;
2051         else
2052                 vmmap_flags = 0;
2053
2054         p = (struct proc *)arg;
2055         structsize = sizeof(struct kinfo_vmentry);
2056         if (sb == NULL) {
2057                 size = 0;
2058                 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2059                 sbuf_set_drain(sb, sbuf_drain_count, &size);
2060                 sbuf_bcat(sb, &structsize, sizeof(structsize));
2061                 PROC_LOCK(p);
2062                 kern_proc_vmmap_out(p, sb, -1, vmmap_flags);
2063                 sbuf_finish(sb);
2064                 sbuf_delete(sb);
2065                 *sizep = size;
2066         } else {
2067                 sbuf_bcat(sb, &structsize, sizeof(structsize));
2068                 PROC_LOCK(p);
2069                 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize),
2070                     vmmap_flags);
2071         }
2072 }
2073
2074 static void
2075 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep)
2076 {
2077         struct proc *p;
2078         size_t size;
2079         int structsize;
2080
2081         p = (struct proc *)arg;
2082         size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t);
2083         if (sb != NULL) {
2084                 KASSERT(*sizep == size, ("invalid size"));
2085                 structsize = sizeof(gid_t);
2086                 sbuf_bcat(sb, &structsize, sizeof(structsize));
2087                 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups *
2088                     sizeof(gid_t));
2089         }
2090         *sizep = size;
2091 }
2092
2093 static void
2094 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep)
2095 {
2096         struct proc *p;
2097         size_t size;
2098         int structsize;
2099
2100         p = (struct proc *)arg;
2101         size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask);
2102         if (sb != NULL) {
2103                 KASSERT(*sizep == size, ("invalid size"));
2104                 structsize = sizeof(p->p_fd->fd_cmask);
2105                 sbuf_bcat(sb, &structsize, sizeof(structsize));
2106                 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask));
2107         }
2108         *sizep = size;
2109 }
2110
2111 static void
2112 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep)
2113 {
2114         struct proc *p;
2115         struct rlimit rlim[RLIM_NLIMITS];
2116         size_t size;
2117         int structsize, i;
2118
2119         p = (struct proc *)arg;
2120         size = sizeof(structsize) + sizeof(rlim);
2121         if (sb != NULL) {
2122                 KASSERT(*sizep == size, ("invalid size"));
2123                 structsize = sizeof(rlim);
2124                 sbuf_bcat(sb, &structsize, sizeof(structsize));
2125                 PROC_LOCK(p);
2126                 for (i = 0; i < RLIM_NLIMITS; i++)
2127                         lim_rlimit(p, i, &rlim[i]);
2128                 PROC_UNLOCK(p);
2129                 sbuf_bcat(sb, rlim, sizeof(rlim));
2130         }
2131         *sizep = size;
2132 }
2133
2134 static void
2135 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep)
2136 {
2137         struct proc *p;
2138         size_t size;
2139         int structsize;
2140
2141         p = (struct proc *)arg;
2142         size = sizeof(structsize) + sizeof(p->p_osrel);
2143         if (sb != NULL) {
2144                 KASSERT(*sizep == size, ("invalid size"));
2145                 structsize = sizeof(p->p_osrel);
2146                 sbuf_bcat(sb, &structsize, sizeof(structsize));
2147                 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel));
2148         }
2149         *sizep = size;
2150 }
2151
2152 static void
2153 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep)
2154 {
2155         struct proc *p;
2156         elf_ps_strings_t ps_strings;
2157         size_t size;
2158         int structsize;
2159
2160         p = (struct proc *)arg;
2161         size = sizeof(structsize) + sizeof(ps_strings);
2162         if (sb != NULL) {
2163                 KASSERT(*sizep == size, ("invalid size"));
2164                 structsize = sizeof(ps_strings);
2165 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2166                 ps_strings = PTROUT(p->p_sysent->sv_psstrings);
2167 #else
2168                 ps_strings = p->p_sysent->sv_psstrings;
2169 #endif
2170                 sbuf_bcat(sb, &structsize, sizeof(structsize));
2171                 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings));
2172         }
2173         *sizep = size;
2174 }
2175
2176 static void
2177 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep)
2178 {
2179         struct proc *p;
2180         size_t size;
2181         int structsize;
2182
2183         p = (struct proc *)arg;
2184         if (sb == NULL) {
2185                 size = 0;
2186                 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2187                 sbuf_set_drain(sb, sbuf_drain_count, &size);
2188                 sbuf_bcat(sb, &structsize, sizeof(structsize));
2189                 PHOLD(p);
2190                 proc_getauxv(curthread, p, sb);
2191                 PRELE(p);
2192                 sbuf_finish(sb);
2193                 sbuf_delete(sb);
2194                 *sizep = size;
2195         } else {
2196                 structsize = sizeof(Elf_Auxinfo);
2197                 sbuf_bcat(sb, &structsize, sizeof(structsize));
2198                 PHOLD(p);
2199                 proc_getauxv(curthread, p, sb);
2200                 PRELE(p);
2201         }
2202 }
2203
2204 static boolean_t
2205 __elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote,
2206     int32_t *osrel, const Elf_Phdr *pnote)
2207 {
2208         const Elf_Note *note, *note0, *note_end;
2209         const char *note_name;
2210         char *buf;
2211         int i, error;
2212         boolean_t res;
2213
2214         /* We need some limit, might as well use PAGE_SIZE. */
2215         if (pnote == NULL || pnote->p_filesz > PAGE_SIZE)
2216                 return (FALSE);
2217         ASSERT_VOP_LOCKED(imgp->vp, "parse_notes");
2218         if (pnote->p_offset > PAGE_SIZE ||
2219             pnote->p_filesz > PAGE_SIZE - pnote->p_offset) {
2220                 VOP_UNLOCK(imgp->vp, 0);
2221                 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK);
2222                 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
2223                 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz,
2224                     pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED,
2225                     curthread->td_ucred, NOCRED, NULL, curthread);
2226                 if (error != 0) {
2227                         uprintf("i/o error PT_NOTE\n");
2228                         res = FALSE;
2229                         goto ret;
2230                 }
2231                 note = note0 = (const Elf_Note *)buf;
2232                 note_end = (const Elf_Note *)(buf + pnote->p_filesz);
2233         } else {
2234                 note = note0 = (const Elf_Note *)(imgp->image_header +
2235                     pnote->p_offset);
2236                 note_end = (const Elf_Note *)(imgp->image_header +
2237                     pnote->p_offset + pnote->p_filesz);
2238                 buf = NULL;
2239         }
2240         for (i = 0; i < 100 && note >= note0 && note < note_end; i++) {
2241                 if (!aligned(note, Elf32_Addr) || (const char *)note_end -
2242                     (const char *)note < sizeof(Elf_Note)) {
2243                         res = FALSE;
2244                         goto ret;
2245                 }
2246                 if (note->n_namesz != checknote->hdr.n_namesz ||
2247                     note->n_descsz != checknote->hdr.n_descsz ||
2248                     note->n_type != checknote->hdr.n_type)
2249                         goto nextnote;
2250                 note_name = (const char *)(note + 1);
2251                 if (note_name + checknote->hdr.n_namesz >=
2252                     (const char *)note_end || strncmp(checknote->vendor,
2253                     note_name, checknote->hdr.n_namesz) != 0)
2254                         goto nextnote;
2255
2256                 /*
2257                  * Fetch the osreldate for binary
2258                  * from the ELF OSABI-note if necessary.
2259                  */
2260                 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 &&
2261                     checknote->trans_osrel != NULL) {
2262                         res = checknote->trans_osrel(note, osrel);
2263                         goto ret;
2264                 }
2265                 res = TRUE;
2266                 goto ret;
2267 nextnote:
2268                 note = (const Elf_Note *)((const char *)(note + 1) +
2269                     roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) +
2270                     roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE));
2271         }
2272         res = FALSE;
2273 ret:
2274         free(buf, M_TEMP);
2275         return (res);
2276 }
2277
2278 /*
2279  * Try to find the appropriate ABI-note section for checknote,
2280  * fetch the osreldate for binary from the ELF OSABI-note. Only the
2281  * first page of the image is searched, the same as for headers.
2282  */
2283 static boolean_t
2284 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote,
2285     int32_t *osrel)
2286 {
2287         const Elf_Phdr *phdr;
2288         const Elf_Ehdr *hdr;
2289         int i;
2290
2291         hdr = (const Elf_Ehdr *)imgp->image_header;
2292         phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
2293
2294         for (i = 0; i < hdr->e_phnum; i++) {
2295                 if (phdr[i].p_type == PT_NOTE &&
2296                     __elfN(parse_notes)(imgp, checknote, osrel, &phdr[i]))
2297                         return (TRUE);
2298         }
2299         return (FALSE);
2300
2301 }
2302
2303 /*
2304  * Tell kern_execve.c about it, with a little help from the linker.
2305  */
2306 static struct execsw __elfN(execsw) = {
2307         __CONCAT(exec_, __elfN(imgact)),
2308         __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
2309 };
2310 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
2311
2312 #ifdef COMPRESS_USER_CORES
2313 /*
2314  * Compress and write out a core segment for a user process.
2315  *
2316  * 'inbuf' is the starting address of a VM segment in the process' address
2317  * space that is to be compressed and written out to the core file.  'dest_buf'
2318  * is a buffer in the kernel's address space.  The segment is copied from
2319  * 'inbuf' to 'dest_buf' first before being processed by the compression
2320  * routine gzwrite().  This copying is necessary because the content of the VM
2321  * segment may change between the compression pass and the crc-computation pass
2322  * in gzwrite().  This is because realtime threads may preempt the UNIX kernel.
2323  *
2324  * If inbuf is NULL it is assumed that data is already copied to 'dest_buf'.
2325  */
2326 static int
2327 compress_core (gzFile file, char *inbuf, char *dest_buf, unsigned int len,
2328     struct thread *td)
2329 {
2330         int len_compressed;
2331         int error = 0;
2332         unsigned int chunk_len;
2333
2334         while (len) {
2335                 if (inbuf != NULL) {
2336                         chunk_len = (len > CORE_BUF_SIZE) ? CORE_BUF_SIZE : len;
2337
2338                         /*
2339                          * We can get EFAULT error here.  In that case zero out
2340                          * the current chunk of the segment.
2341                          */
2342                         error = copyin(inbuf, dest_buf, chunk_len);
2343                         if (error != 0) {
2344                                 bzero(dest_buf, chunk_len);
2345                                 error = 0;
2346                         }
2347                         inbuf += chunk_len;
2348                 } else {
2349                         chunk_len = len;
2350                 }
2351                 len_compressed = gzwrite(file, dest_buf, chunk_len);
2352
2353                 EVENTHANDLER_INVOKE(app_coredump_progress, td, len_compressed);
2354
2355                 if ((unsigned int)len_compressed != chunk_len) {
2356                         log(LOG_WARNING,
2357                             "compress_core: length mismatch (0x%x returned, "
2358                             "0x%x expected)\n", len_compressed, chunk_len);
2359                         EVENTHANDLER_INVOKE(app_coredump_error, td,
2360                             "compress_core: length mismatch %x -> %x",
2361                             chunk_len, len_compressed);
2362                         error = EFAULT;
2363                         break;
2364                 }
2365                 len -= chunk_len;
2366                 maybe_yield();
2367         }
2368
2369         return (error);
2370 }
2371 #endif /* COMPRESS_USER_CORES */
2372
2373 static vm_prot_t
2374 __elfN(trans_prot)(Elf_Word flags)
2375 {
2376         vm_prot_t prot;
2377
2378         prot = 0;
2379         if (flags & PF_X)
2380                 prot |= VM_PROT_EXECUTE;
2381         if (flags & PF_W)
2382                 prot |= VM_PROT_WRITE;
2383         if (flags & PF_R)
2384                 prot |= VM_PROT_READ;
2385 #if __ELF_WORD_SIZE == 32
2386 #if defined(__amd64__) || defined(__ia64__)
2387         if (i386_read_exec && (flags & PF_R))
2388                 prot |= VM_PROT_EXECUTE;
2389 #endif
2390 #endif
2391         return (prot);
2392 }
2393
2394 static Elf_Word
2395 __elfN(untrans_prot)(vm_prot_t prot)
2396 {
2397         Elf_Word flags;
2398
2399         flags = 0;
2400         if (prot & VM_PROT_EXECUTE)
2401                 flags |= PF_X;
2402         if (prot & VM_PROT_READ)
2403                 flags |= PF_R;
2404         if (prot & VM_PROT_WRITE)
2405                 flags |= PF_W;
2406         return (flags);
2407 }