The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/imgact_elf.c

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    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: releng/10.1/sys/kern/imgact_elf.c 267561 2014-06-17 05:21:48Z dchagin $");
   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/capability.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/kernel.h>
   45 #include <sys/lock.h>
   46 #include <sys/malloc.h>
   47 #include <sys/mount.h>
   48 #include <sys/mman.h>
   49 #include <sys/namei.h>
   50 #include <sys/pioctl.h>
   51 #include <sys/proc.h>
   52 #include <sys/procfs.h>
   53 #include <sys/racct.h>
   54 #include <sys/resourcevar.h>
   55 #include <sys/rwlock.h>
   56 #include <sys/sbuf.h>
   57 #include <sys/sf_buf.h>
   58 #include <sys/smp.h>
   59 #include <sys/systm.h>
   60 #include <sys/signalvar.h>
   61 #include <sys/stat.h>
   62 #include <sys/sx.h>
   63 #include <sys/syscall.h>
   64 #include <sys/sysctl.h>
   65 #include <sys/sysent.h>
   66 #include <sys/vnode.h>
   67 #include <sys/syslog.h>
   68 #include <sys/eventhandler.h>
   69 #include <sys/user.h>
   70 
   71 #include <net/zlib.h>
   72 
   73 #include <vm/vm.h>
   74 #include <vm/vm_kern.h>
   75 #include <vm/vm_param.h>
   76 #include <vm/pmap.h>
   77 #include <vm/vm_map.h>
   78 #include <vm/vm_object.h>
   79 #include <vm/vm_extern.h>
   80 
   81 #include <machine/elf.h>
   82 #include <machine/md_var.h>
   83 
   84 #define ELF_NOTE_ROUNDSIZE      4
   85 #define OLD_EI_BRAND    8
   86 
   87 static int __elfN(check_header)(const Elf_Ehdr *hdr);
   88 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp,
   89     const char *interp, int interp_name_len, int32_t *osrel);
   90 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
   91     u_long *entry, size_t pagesize);
   92 static int __elfN(load_section)(struct image_params *imgp, vm_offset_t offset,
   93     caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
   94     size_t pagesize);
   95 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp);
   96 static boolean_t __elfN(freebsd_trans_osrel)(const Elf_Note *note,
   97     int32_t *osrel);
   98 static boolean_t kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel);
   99 static boolean_t __elfN(check_note)(struct image_params *imgp,
  100     Elf_Brandnote *checknote, int32_t *osrel);
  101 static vm_prot_t __elfN(trans_prot)(Elf_Word);
  102 static Elf_Word __elfN(untrans_prot)(vm_prot_t);
  103 
  104 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0,
  105     "");
  106 
  107 #ifdef COMPRESS_USER_CORES
  108 static int compress_core(gzFile, char *, char *, unsigned int,
  109     struct thread * td);
  110 #endif
  111 #define CORE_BUF_SIZE   (16 * 1024)
  112 
  113 int __elfN(fallback_brand) = -1;
  114 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
  115     fallback_brand, CTLFLAG_RW, &__elfN(fallback_brand), 0,
  116     __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort");
  117 TUNABLE_INT("kern.elf" __XSTRING(__ELF_WORD_SIZE) ".fallback_brand",
  118     &__elfN(fallback_brand));
  119 
  120 static int elf_legacy_coredump = 0;
  121 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 
  122     &elf_legacy_coredump, 0, "");
  123 
  124 int __elfN(nxstack) =
  125 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */
  126         1;
  127 #else
  128         0;
  129 #endif
  130 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
  131     nxstack, CTLFLAG_RW, &__elfN(nxstack), 0,
  132     __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack");
  133 
  134 #if __ELF_WORD_SIZE == 32
  135 #if defined(__amd64__) || defined(__ia64__)
  136 int i386_read_exec = 0;
  137 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0,
  138     "enable execution from readable segments");
  139 #endif
  140 #endif
  141 
  142 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS];
  143 
  144 #define trunc_page_ps(va, ps)   ((va) & ~(ps - 1))
  145 #define round_page_ps(va, ps)   (((va) + (ps - 1)) & ~(ps - 1))
  146 #define aligned(a, t)   (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a))
  147 
  148 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD";
  149 
  150 Elf_Brandnote __elfN(freebsd_brandnote) = {
  151         .hdr.n_namesz   = sizeof(FREEBSD_ABI_VENDOR),
  152         .hdr.n_descsz   = sizeof(int32_t),
  153         .hdr.n_type     = 1,
  154         .vendor         = FREEBSD_ABI_VENDOR,
  155         .flags          = BN_TRANSLATE_OSREL,
  156         .trans_osrel    = __elfN(freebsd_trans_osrel)
  157 };
  158 
  159 static boolean_t
  160 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel)
  161 {
  162         uintptr_t p;
  163 
  164         p = (uintptr_t)(note + 1);
  165         p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
  166         *osrel = *(const int32_t *)(p);
  167 
  168         return (TRUE);
  169 }
  170 
  171 static const char GNU_ABI_VENDOR[] = "GNU";
  172 static int GNU_KFREEBSD_ABI_DESC = 3;
  173 
  174 Elf_Brandnote __elfN(kfreebsd_brandnote) = {
  175         .hdr.n_namesz   = sizeof(GNU_ABI_VENDOR),
  176         .hdr.n_descsz   = 16,   /* XXX at least 16 */
  177         .hdr.n_type     = 1,
  178         .vendor         = GNU_ABI_VENDOR,
  179         .flags          = BN_TRANSLATE_OSREL,
  180         .trans_osrel    = kfreebsd_trans_osrel
  181 };
  182 
  183 static boolean_t
  184 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel)
  185 {
  186         const Elf32_Word *desc;
  187         uintptr_t p;
  188 
  189         p = (uintptr_t)(note + 1);
  190         p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
  191 
  192         desc = (const Elf32_Word *)p;
  193         if (desc[0] != GNU_KFREEBSD_ABI_DESC)
  194                 return (FALSE);
  195 
  196         /*
  197          * Debian GNU/kFreeBSD embed the earliest compatible kernel version
  198          * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way.
  199          */
  200         *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3];
  201 
  202         return (TRUE);
  203 }
  204 
  205 int
  206 __elfN(insert_brand_entry)(Elf_Brandinfo *entry)
  207 {
  208         int i;
  209 
  210         for (i = 0; i < MAX_BRANDS; i++) {
  211                 if (elf_brand_list[i] == NULL) {
  212                         elf_brand_list[i] = entry;
  213                         break;
  214                 }
  215         }
  216         if (i == MAX_BRANDS) {
  217                 printf("WARNING: %s: could not insert brandinfo entry: %p\n",
  218                         __func__, entry);
  219                 return (-1);
  220         }
  221         return (0);
  222 }
  223 
  224 int
  225 __elfN(remove_brand_entry)(Elf_Brandinfo *entry)
  226 {
  227         int i;
  228 
  229         for (i = 0; i < MAX_BRANDS; i++) {
  230                 if (elf_brand_list[i] == entry) {
  231                         elf_brand_list[i] = NULL;
  232                         break;
  233                 }
  234         }
  235         if (i == MAX_BRANDS)
  236                 return (-1);
  237         return (0);
  238 }
  239 
  240 int
  241 __elfN(brand_inuse)(Elf_Brandinfo *entry)
  242 {
  243         struct proc *p;
  244         int rval = FALSE;
  245 
  246         sx_slock(&allproc_lock);
  247         FOREACH_PROC_IN_SYSTEM(p) {
  248                 if (p->p_sysent == entry->sysvec) {
  249                         rval = TRUE;
  250                         break;
  251                 }
  252         }
  253         sx_sunlock(&allproc_lock);
  254 
  255         return (rval);
  256 }
  257 
  258 static Elf_Brandinfo *
  259 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
  260     int interp_name_len, int32_t *osrel)
  261 {
  262         const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
  263         Elf_Brandinfo *bi;
  264         boolean_t ret;
  265         int i;
  266 
  267         /*
  268          * We support four types of branding -- (1) the ELF EI_OSABI field
  269          * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
  270          * branding w/in the ELF header, (3) path of the `interp_path'
  271          * field, and (4) the ".note.ABI-tag" ELF section.
  272          */
  273 
  274         /* Look for an ".note.ABI-tag" ELF section */
  275         for (i = 0; i < MAX_BRANDS; i++) {
  276                 bi = elf_brand_list[i];
  277                 if (bi == NULL)
  278                         continue;
  279                 if (hdr->e_machine == bi->machine && (bi->flags &
  280                     (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
  281                         ret = __elfN(check_note)(imgp, bi->brand_note, osrel);
  282                         if (ret)
  283                                 return (bi);
  284                 }
  285         }
  286 
  287         /* If the executable has a brand, search for it in the brand list. */
  288         for (i = 0; i < MAX_BRANDS; i++) {
  289                 bi = elf_brand_list[i];
  290                 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
  291                         continue;
  292                 if (hdr->e_machine == bi->machine &&
  293                     (hdr->e_ident[EI_OSABI] == bi->brand ||
  294                     strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
  295                     bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0))
  296                         return (bi);
  297         }
  298 
  299         /* Lacking a known brand, search for a recognized interpreter. */
  300         if (interp != NULL) {
  301                 for (i = 0; i < MAX_BRANDS; i++) {
  302                         bi = elf_brand_list[i];
  303                         if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
  304                                 continue;
  305                         if (hdr->e_machine == bi->machine &&
  306                             /* ELF image p_filesz includes terminating zero */
  307                             strlen(bi->interp_path) + 1 == interp_name_len &&
  308                             strncmp(interp, bi->interp_path, interp_name_len)
  309                             == 0)
  310                                 return (bi);
  311                 }
  312         }
  313 
  314         /* Lacking a recognized interpreter, try the default brand */
  315         for (i = 0; i < MAX_BRANDS; i++) {
  316                 bi = elf_brand_list[i];
  317                 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
  318                         continue;
  319                 if (hdr->e_machine == bi->machine &&
  320                     __elfN(fallback_brand) == bi->brand)
  321                         return (bi);
  322         }
  323         return (NULL);
  324 }
  325 
  326 static int
  327 __elfN(check_header)(const Elf_Ehdr *hdr)
  328 {
  329         Elf_Brandinfo *bi;
  330         int i;
  331 
  332         if (!IS_ELF(*hdr) ||
  333             hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
  334             hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
  335             hdr->e_ident[EI_VERSION] != EV_CURRENT ||
  336             hdr->e_phentsize != sizeof(Elf_Phdr) ||
  337             hdr->e_version != ELF_TARG_VER)
  338                 return (ENOEXEC);
  339 
  340         /*
  341          * Make sure we have at least one brand for this machine.
  342          */
  343 
  344         for (i = 0; i < MAX_BRANDS; i++) {
  345                 bi = elf_brand_list[i];
  346                 if (bi != NULL && bi->machine == hdr->e_machine)
  347                         break;
  348         }
  349         if (i == MAX_BRANDS)
  350                 return (ENOEXEC);
  351 
  352         return (0);
  353 }
  354 
  355 static int
  356 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
  357     vm_offset_t start, vm_offset_t end, vm_prot_t prot)
  358 {
  359         struct sf_buf *sf;
  360         int error;
  361         vm_offset_t off;
  362 
  363         /*
  364          * Create the page if it doesn't exist yet. Ignore errors.
  365          */
  366         vm_map_lock(map);
  367         vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end),
  368             VM_PROT_ALL, VM_PROT_ALL, 0);
  369         vm_map_unlock(map);
  370 
  371         /*
  372          * Find the page from the underlying object.
  373          */
  374         if (object) {
  375                 sf = vm_imgact_map_page(object, offset);
  376                 if (sf == NULL)
  377                         return (KERN_FAILURE);
  378                 off = offset - trunc_page(offset);
  379                 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start,
  380                     end - start);
  381                 vm_imgact_unmap_page(sf);
  382                 if (error) {
  383                         return (KERN_FAILURE);
  384                 }
  385         }
  386 
  387         return (KERN_SUCCESS);
  388 }
  389 
  390 static int
  391 __elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
  392     vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow)
  393 {
  394         struct sf_buf *sf;
  395         vm_offset_t off;
  396         vm_size_t sz;
  397         int error, rv;
  398 
  399         if (start != trunc_page(start)) {
  400                 rv = __elfN(map_partial)(map, object, offset, start,
  401                     round_page(start), prot);
  402                 if (rv)
  403                         return (rv);
  404                 offset += round_page(start) - start;
  405                 start = round_page(start);
  406         }
  407         if (end != round_page(end)) {
  408                 rv = __elfN(map_partial)(map, object, offset +
  409                     trunc_page(end) - start, trunc_page(end), end, prot);
  410                 if (rv)
  411                         return (rv);
  412                 end = trunc_page(end);
  413         }
  414         if (end > start) {
  415                 if (offset & PAGE_MASK) {
  416                         /*
  417                          * The mapping is not page aligned. This means we have
  418                          * to copy the data. Sigh.
  419                          */
  420                         rv = vm_map_find(map, NULL, 0, &start, end - start, 0,
  421                             VMFS_NO_SPACE, prot | VM_PROT_WRITE, VM_PROT_ALL,
  422                             0);
  423                         if (rv)
  424                                 return (rv);
  425                         if (object == NULL)
  426                                 return (KERN_SUCCESS);
  427                         for (; start < end; start += sz) {
  428                                 sf = vm_imgact_map_page(object, offset);
  429                                 if (sf == NULL)
  430                                         return (KERN_FAILURE);
  431                                 off = offset - trunc_page(offset);
  432                                 sz = end - start;
  433                                 if (sz > PAGE_SIZE - off)
  434                                         sz = PAGE_SIZE - off;
  435                                 error = copyout((caddr_t)sf_buf_kva(sf) + off,
  436                                     (caddr_t)start, sz);
  437                                 vm_imgact_unmap_page(sf);
  438                                 if (error) {
  439                                         return (KERN_FAILURE);
  440                                 }
  441                                 offset += sz;
  442                         }
  443                         rv = KERN_SUCCESS;
  444                 } else {
  445                         vm_object_reference(object);
  446                         vm_map_lock(map);
  447                         rv = vm_map_insert(map, object, offset, start, end,
  448                             prot, VM_PROT_ALL, cow);
  449                         vm_map_unlock(map);
  450                         if (rv != KERN_SUCCESS)
  451                                 vm_object_deallocate(object);
  452                 }
  453                 return (rv);
  454         } else {
  455                 return (KERN_SUCCESS);
  456         }
  457 }
  458 
  459 static int
  460 __elfN(load_section)(struct image_params *imgp, vm_offset_t offset,
  461     caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
  462     size_t pagesize)
  463 {
  464         struct sf_buf *sf;
  465         size_t map_len;
  466         vm_map_t map;
  467         vm_object_t object;
  468         vm_offset_t map_addr;
  469         int error, rv, cow;
  470         size_t copy_len;
  471         vm_offset_t file_addr;
  472 
  473         /*
  474          * It's necessary to fail if the filsz + offset taken from the
  475          * header is greater than the actual file pager object's size.
  476          * If we were to allow this, then the vm_map_find() below would
  477          * walk right off the end of the file object and into the ether.
  478          *
  479          * While I'm here, might as well check for something else that
  480          * is invalid: filsz cannot be greater than memsz.
  481          */
  482         if ((off_t)filsz + offset > imgp->attr->va_size || filsz > memsz) {
  483                 uprintf("elf_load_section: truncated ELF file\n");
  484                 return (ENOEXEC);
  485         }
  486 
  487         object = imgp->object;
  488         map = &imgp->proc->p_vmspace->vm_map;
  489         map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize);
  490         file_addr = trunc_page_ps(offset, pagesize);
  491 
  492         /*
  493          * We have two choices.  We can either clear the data in the last page
  494          * of an oversized mapping, or we can start the anon mapping a page
  495          * early and copy the initialized data into that first page.  We
  496          * choose the second..
  497          */
  498         if (memsz > filsz)
  499                 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr;
  500         else
  501                 map_len = round_page_ps(offset + filsz, pagesize) - file_addr;
  502 
  503         if (map_len != 0) {
  504                 /* cow flags: don't dump readonly sections in core */
  505                 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
  506                     (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
  507 
  508                 rv = __elfN(map_insert)(map,
  509                                       object,
  510                                       file_addr,        /* file offset */
  511                                       map_addr,         /* virtual start */
  512                                       map_addr + map_len,/* virtual end */
  513                                       prot,
  514                                       cow);
  515                 if (rv != KERN_SUCCESS)
  516                         return (EINVAL);
  517 
  518                 /* we can stop now if we've covered it all */
  519                 if (memsz == filsz) {
  520                         return (0);
  521                 }
  522         }
  523 
  524 
  525         /*
  526          * We have to get the remaining bit of the file into the first part
  527          * of the oversized map segment.  This is normally because the .data
  528          * segment in the file is extended to provide bss.  It's a neat idea
  529          * to try and save a page, but it's a pain in the behind to implement.
  530          */
  531         copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize);
  532         map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize);
  533         map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) -
  534             map_addr;
  535 
  536         /* This had damn well better be true! */
  537         if (map_len != 0) {
  538                 rv = __elfN(map_insert)(map, NULL, 0, map_addr, map_addr +
  539                     map_len, VM_PROT_ALL, 0);
  540                 if (rv != KERN_SUCCESS) {
  541                         return (EINVAL);
  542                 }
  543         }
  544 
  545         if (copy_len != 0) {
  546                 vm_offset_t off;
  547 
  548                 sf = vm_imgact_map_page(object, offset + filsz);
  549                 if (sf == NULL)
  550                         return (EIO);
  551 
  552                 /* send the page fragment to user space */
  553                 off = trunc_page_ps(offset + filsz, pagesize) -
  554                     trunc_page(offset + filsz);
  555                 error = copyout((caddr_t)sf_buf_kva(sf) + off,
  556                     (caddr_t)map_addr, copy_len);
  557                 vm_imgact_unmap_page(sf);
  558                 if (error) {
  559                         return (error);
  560                 }
  561         }
  562 
  563         /*
  564          * set it to the specified protection.
  565          * XXX had better undo the damage from pasting over the cracks here!
  566          */
  567         vm_map_protect(map, trunc_page(map_addr), round_page(map_addr +
  568             map_len), prot, FALSE);
  569 
  570         return (0);
  571 }
  572 
  573 /*
  574  * Load the file "file" into memory.  It may be either a shared object
  575  * or an executable.
  576  *
  577  * The "addr" reference parameter is in/out.  On entry, it specifies
  578  * the address where a shared object should be loaded.  If the file is
  579  * an executable, this value is ignored.  On exit, "addr" specifies
  580  * where the file was actually loaded.
  581  *
  582  * The "entry" reference parameter is out only.  On exit, it specifies
  583  * the entry point for the loaded file.
  584  */
  585 static int
  586 __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
  587         u_long *entry, size_t pagesize)
  588 {
  589         struct {
  590                 struct nameidata nd;
  591                 struct vattr attr;
  592                 struct image_params image_params;
  593         } *tempdata;
  594         const Elf_Ehdr *hdr = NULL;
  595         const Elf_Phdr *phdr = NULL;
  596         struct nameidata *nd;
  597         struct vattr *attr;
  598         struct image_params *imgp;
  599         vm_prot_t prot;
  600         u_long rbase;
  601         u_long base_addr = 0;
  602         int error, i, numsegs;
  603 
  604 #ifdef CAPABILITY_MODE
  605         /*
  606          * XXXJA: This check can go away once we are sufficiently confident
  607          * that the checks in namei() are correct.
  608          */
  609         if (IN_CAPABILITY_MODE(curthread))
  610                 return (ECAPMODE);
  611 #endif
  612 
  613         tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
  614         nd = &tempdata->nd;
  615         attr = &tempdata->attr;
  616         imgp = &tempdata->image_params;
  617 
  618         /*
  619          * Initialize part of the common data
  620          */
  621         imgp->proc = p;
  622         imgp->attr = attr;
  623         imgp->firstpage = NULL;
  624         imgp->image_header = NULL;
  625         imgp->object = NULL;
  626         imgp->execlabel = NULL;
  627 
  628         NDINIT(nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, curthread);
  629         if ((error = namei(nd)) != 0) {
  630                 nd->ni_vp = NULL;
  631                 goto fail;
  632         }
  633         NDFREE(nd, NDF_ONLY_PNBUF);
  634         imgp->vp = nd->ni_vp;
  635 
  636         /*
  637          * Check permissions, modes, uid, etc on the file, and "open" it.
  638          */
  639         error = exec_check_permissions(imgp);
  640         if (error)
  641                 goto fail;
  642 
  643         error = exec_map_first_page(imgp);
  644         if (error)
  645                 goto fail;
  646 
  647         /*
  648          * Also make certain that the interpreter stays the same, so set
  649          * its VV_TEXT flag, too.
  650          */
  651         VOP_SET_TEXT(nd->ni_vp);
  652 
  653         imgp->object = nd->ni_vp->v_object;
  654 
  655         hdr = (const Elf_Ehdr *)imgp->image_header;
  656         if ((error = __elfN(check_header)(hdr)) != 0)
  657                 goto fail;
  658         if (hdr->e_type == ET_DYN)
  659                 rbase = *addr;
  660         else if (hdr->e_type == ET_EXEC)
  661                 rbase = 0;
  662         else {
  663                 error = ENOEXEC;
  664                 goto fail;
  665         }
  666 
  667         /* Only support headers that fit within first page for now      */
  668         if ((hdr->e_phoff > PAGE_SIZE) ||
  669             (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
  670                 error = ENOEXEC;
  671                 goto fail;
  672         }
  673 
  674         phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
  675         if (!aligned(phdr, Elf_Addr)) {
  676                 error = ENOEXEC;
  677                 goto fail;
  678         }
  679 
  680         for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
  681                 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) {
  682                         /* Loadable segment */
  683                         prot = __elfN(trans_prot)(phdr[i].p_flags);
  684                         error = __elfN(load_section)(imgp, phdr[i].p_offset,
  685                             (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase,
  686                             phdr[i].p_memsz, phdr[i].p_filesz, prot, pagesize);
  687                         if (error != 0)
  688                                 goto fail;
  689                         /*
  690                          * Establish the base address if this is the
  691                          * first segment.
  692                          */
  693                         if (numsegs == 0)
  694                                 base_addr = trunc_page(phdr[i].p_vaddr +
  695                                     rbase);
  696                         numsegs++;
  697                 }
  698         }
  699         *addr = base_addr;
  700         *entry = (unsigned long)hdr->e_entry + rbase;
  701 
  702 fail:
  703         if (imgp->firstpage)
  704                 exec_unmap_first_page(imgp);
  705 
  706         if (nd->ni_vp)
  707                 vput(nd->ni_vp);
  708 
  709         free(tempdata, M_TEMP);
  710 
  711         return (error);
  712 }
  713 
  714 static int
  715 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
  716 {
  717         const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
  718         const Elf_Phdr *phdr;
  719         Elf_Auxargs *elf_auxargs;
  720         struct vmspace *vmspace;
  721         vm_prot_t prot;
  722         u_long text_size = 0, data_size = 0, total_size = 0;
  723         u_long text_addr = 0, data_addr = 0;
  724         u_long seg_size, seg_addr;
  725         u_long addr, baddr, et_dyn_addr, entry = 0, proghdr = 0;
  726         int32_t osrel = 0;
  727         int error = 0, i, n, interp_name_len = 0;
  728         const char *interp = NULL, *newinterp = NULL;
  729         Elf_Brandinfo *brand_info;
  730         char *path;
  731         struct sysentvec *sv;
  732 
  733         /*
  734          * Do we have a valid ELF header ?
  735          *
  736          * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later
  737          * if particular brand doesn't support it.
  738          */
  739         if (__elfN(check_header)(hdr) != 0 ||
  740             (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
  741                 return (-1);
  742 
  743         /*
  744          * From here on down, we return an errno, not -1, as we've
  745          * detected an ELF file.
  746          */
  747 
  748         if ((hdr->e_phoff > PAGE_SIZE) ||
  749             (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
  750                 /* Only support headers in first page for now */
  751                 return (ENOEXEC);
  752         }
  753         phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
  754         if (!aligned(phdr, Elf_Addr))
  755                 return (ENOEXEC);
  756         n = 0;
  757         baddr = 0;
  758         for (i = 0; i < hdr->e_phnum; i++) {
  759                 switch (phdr[i].p_type) {
  760                 case PT_LOAD:
  761                         if (n == 0)
  762                                 baddr = phdr[i].p_vaddr;
  763                         n++;
  764                         break;
  765                 case PT_INTERP:
  766                         /* Path to interpreter */
  767                         if (phdr[i].p_filesz > MAXPATHLEN ||
  768                             phdr[i].p_offset > PAGE_SIZE ||
  769                             phdr[i].p_filesz > PAGE_SIZE - phdr[i].p_offset)
  770                                 return (ENOEXEC);
  771                         interp = imgp->image_header + phdr[i].p_offset;
  772                         interp_name_len = phdr[i].p_filesz;
  773                         break;
  774                 case PT_GNU_STACK:
  775                         if (__elfN(nxstack))
  776                                 imgp->stack_prot =
  777                                     __elfN(trans_prot)(phdr[i].p_flags);
  778                         break;
  779                 }
  780         }
  781 
  782         brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len,
  783             &osrel);
  784         if (brand_info == NULL) {
  785                 uprintf("ELF binary type \"%u\" not known.\n",
  786                     hdr->e_ident[EI_OSABI]);
  787                 return (ENOEXEC);
  788         }
  789         if (hdr->e_type == ET_DYN) {
  790                 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0)
  791                         return (ENOEXEC);
  792                 /*
  793                  * Honour the base load address from the dso if it is
  794                  * non-zero for some reason.
  795                  */
  796                 if (baddr == 0)
  797                         et_dyn_addr = ET_DYN_LOAD_ADDR;
  798                 else
  799                         et_dyn_addr = 0;
  800         } else
  801                 et_dyn_addr = 0;
  802         sv = brand_info->sysvec;
  803         if (interp != NULL && brand_info->interp_newpath != NULL)
  804                 newinterp = brand_info->interp_newpath;
  805 
  806         /*
  807          * Avoid a possible deadlock if the current address space is destroyed
  808          * and that address space maps the locked vnode.  In the common case,
  809          * the locked vnode's v_usecount is decremented but remains greater
  810          * than zero.  Consequently, the vnode lock is not needed by vrele().
  811          * However, in cases where the vnode lock is external, such as nullfs,
  812          * v_usecount may become zero.
  813          *
  814          * The VV_TEXT flag prevents modifications to the executable while
  815          * the vnode is unlocked.
  816          */
  817         VOP_UNLOCK(imgp->vp, 0);
  818 
  819         error = exec_new_vmspace(imgp, sv);
  820         imgp->proc->p_sysent = sv;
  821 
  822         vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
  823         if (error)
  824                 return (error);
  825 
  826         for (i = 0; i < hdr->e_phnum; i++) {
  827                 switch (phdr[i].p_type) {
  828                 case PT_LOAD:   /* Loadable segment */
  829                         if (phdr[i].p_memsz == 0)
  830                                 break;
  831                         prot = __elfN(trans_prot)(phdr[i].p_flags);
  832                         error = __elfN(load_section)(imgp, phdr[i].p_offset,
  833                             (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr,
  834                             phdr[i].p_memsz, phdr[i].p_filesz, prot,
  835                             sv->sv_pagesize);
  836                         if (error != 0)
  837                                 return (error);
  838 
  839                         /*
  840                          * If this segment contains the program headers,
  841                          * remember their virtual address for the AT_PHDR
  842                          * aux entry. Static binaries don't usually include
  843                          * a PT_PHDR entry.
  844                          */
  845                         if (phdr[i].p_offset == 0 &&
  846                             hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize
  847                                 <= phdr[i].p_filesz)
  848                                 proghdr = phdr[i].p_vaddr + hdr->e_phoff +
  849                                     et_dyn_addr;
  850 
  851                         seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
  852                         seg_size = round_page(phdr[i].p_memsz +
  853                             phdr[i].p_vaddr + et_dyn_addr - seg_addr);
  854 
  855                         /*
  856                          * Make the largest executable segment the official
  857                          * text segment and all others data.
  858                          *
  859                          * Note that obreak() assumes that data_addr + 
  860                          * data_size == end of data load area, and the ELF
  861                          * file format expects segments to be sorted by
  862                          * address.  If multiple data segments exist, the
  863                          * last one will be used.
  864                          */
  865 
  866                         if (phdr[i].p_flags & PF_X && text_size < seg_size) {
  867                                 text_size = seg_size;
  868                                 text_addr = seg_addr;
  869                         } else {
  870                                 data_size = seg_size;
  871                                 data_addr = seg_addr;
  872                         }
  873                         total_size += seg_size;
  874                         break;
  875                 case PT_PHDR:   /* Program header table info */
  876                         proghdr = phdr[i].p_vaddr + et_dyn_addr;
  877                         break;
  878                 default:
  879                         break;
  880                 }
  881         }
  882         
  883         if (data_addr == 0 && data_size == 0) {
  884                 data_addr = text_addr;
  885                 data_size = text_size;
  886         }
  887 
  888         entry = (u_long)hdr->e_entry + et_dyn_addr;
  889 
  890         /*
  891          * Check limits.  It should be safe to check the
  892          * limits after loading the segments since we do
  893          * not actually fault in all the segments pages.
  894          */
  895         PROC_LOCK(imgp->proc);
  896         if (data_size > lim_cur(imgp->proc, RLIMIT_DATA) ||
  897             text_size > maxtsiz ||
  898             total_size > lim_cur(imgp->proc, RLIMIT_VMEM) ||
  899             racct_set(imgp->proc, RACCT_DATA, data_size) != 0 ||
  900             racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) {
  901                 PROC_UNLOCK(imgp->proc);
  902                 return (ENOMEM);
  903         }
  904 
  905         vmspace = imgp->proc->p_vmspace;
  906         vmspace->vm_tsize = text_size >> PAGE_SHIFT;
  907         vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
  908         vmspace->vm_dsize = data_size >> PAGE_SHIFT;
  909         vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
  910 
  911         /*
  912          * We load the dynamic linker where a userland call
  913          * to mmap(0, ...) would put it.  The rationale behind this
  914          * calculation is that it leaves room for the heap to grow to
  915          * its maximum allowed size.
  916          */
  917         addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(imgp->proc,
  918             RLIMIT_DATA));
  919         PROC_UNLOCK(imgp->proc);
  920 
  921         imgp->entry_addr = entry;
  922 
  923         if (interp != NULL) {
  924                 int have_interp = FALSE;
  925                 VOP_UNLOCK(imgp->vp, 0);
  926                 if (brand_info->emul_path != NULL &&
  927                     brand_info->emul_path[0] != '\0') {
  928                         path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
  929                         snprintf(path, MAXPATHLEN, "%s%s",
  930                             brand_info->emul_path, interp);
  931                         error = __elfN(load_file)(imgp->proc, path, &addr,
  932                             &imgp->entry_addr, sv->sv_pagesize);
  933                         free(path, M_TEMP);
  934                         if (error == 0)
  935                                 have_interp = TRUE;
  936                 }
  937                 if (!have_interp && newinterp != NULL) {
  938                         error = __elfN(load_file)(imgp->proc, newinterp, &addr,
  939                             &imgp->entry_addr, sv->sv_pagesize);
  940                         if (error == 0)
  941                                 have_interp = TRUE;
  942                 }
  943                 if (!have_interp) {
  944                         error = __elfN(load_file)(imgp->proc, interp, &addr,
  945                             &imgp->entry_addr, sv->sv_pagesize);
  946                 }
  947                 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
  948                 if (error != 0) {
  949                         uprintf("ELF interpreter %s not found\n", interp);
  950                         return (error);
  951                 }
  952         } else
  953                 addr = et_dyn_addr;
  954 
  955         /*
  956          * Construct auxargs table (used by the fixup routine)
  957          */
  958         elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
  959         elf_auxargs->execfd = -1;
  960         elf_auxargs->phdr = proghdr;
  961         elf_auxargs->phent = hdr->e_phentsize;
  962         elf_auxargs->phnum = hdr->e_phnum;
  963         elf_auxargs->pagesz = PAGE_SIZE;
  964         elf_auxargs->base = addr;
  965         elf_auxargs->flags = 0;
  966         elf_auxargs->entry = entry;
  967 
  968         imgp->auxargs = elf_auxargs;
  969         imgp->interpreted = 0;
  970         imgp->reloc_base = addr;
  971         imgp->proc->p_osrel = osrel;
  972 
  973         return (error);
  974 }
  975 
  976 #define suword __CONCAT(suword, __ELF_WORD_SIZE)
  977 
  978 int
  979 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp)
  980 {
  981         Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
  982         Elf_Addr *base;
  983         Elf_Addr *pos;
  984 
  985         base = (Elf_Addr *)*stack_base;
  986         pos = base + (imgp->args->argc + imgp->args->envc + 2);
  987 
  988         if (args->execfd != -1)
  989                 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
  990         AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
  991         AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
  992         AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
  993         AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
  994         AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
  995         AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
  996         AUXARGS_ENTRY(pos, AT_BASE, args->base);
  997         if (imgp->execpathp != 0)
  998                 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp);
  999         AUXARGS_ENTRY(pos, AT_OSRELDATE, osreldate);
 1000         if (imgp->canary != 0) {
 1001                 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary);
 1002                 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen);
 1003         }
 1004         AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus);
 1005         if (imgp->pagesizes != 0) {
 1006                 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes);
 1007                 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen);
 1008         }
 1009         if (imgp->sysent->sv_timekeep_base != 0) {
 1010                 AUXARGS_ENTRY(pos, AT_TIMEKEEP,
 1011                     imgp->sysent->sv_timekeep_base);
 1012         }
 1013         AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj
 1014             != NULL && imgp->stack_prot != 0 ? imgp->stack_prot :
 1015             imgp->sysent->sv_stackprot);
 1016         AUXARGS_ENTRY(pos, AT_NULL, 0);
 1017 
 1018         free(imgp->auxargs, M_TEMP);
 1019         imgp->auxargs = NULL;
 1020 
 1021         base--;
 1022         suword(base, (long)imgp->args->argc);
 1023         *stack_base = (register_t *)base;
 1024         return (0);
 1025 }
 1026 
 1027 /*
 1028  * Code for generating ELF core dumps.
 1029  */
 1030 
 1031 typedef void (*segment_callback)(vm_map_entry_t, void *);
 1032 
 1033 /* Closure for cb_put_phdr(). */
 1034 struct phdr_closure {
 1035         Elf_Phdr *phdr;         /* Program header to fill in */
 1036         Elf_Off offset;         /* Offset of segment in core file */
 1037 };
 1038 
 1039 /* Closure for cb_size_segment(). */
 1040 struct sseg_closure {
 1041         int count;              /* Count of writable segments. */
 1042         size_t size;            /* Total size of all writable segments. */
 1043 };
 1044 
 1045 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *);
 1046 
 1047 struct note_info {
 1048         int             type;           /* Note type. */
 1049         outfunc_t       outfunc;        /* Output function. */
 1050         void            *outarg;        /* Argument for the output function. */
 1051         size_t          outsize;        /* Output size. */
 1052         TAILQ_ENTRY(note_info) link;    /* Link to the next note info. */
 1053 };
 1054 
 1055 TAILQ_HEAD(note_info_list, note_info);
 1056 
 1057 static void cb_put_phdr(vm_map_entry_t, void *);
 1058 static void cb_size_segment(vm_map_entry_t, void *);
 1059 static void each_writable_segment(struct thread *, segment_callback, void *);
 1060 static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *,
 1061     int, void *, size_t, struct note_info_list *, size_t, gzFile);
 1062 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *,
 1063     size_t *);
 1064 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t);
 1065 static void __elfN(putnote)(struct note_info *, struct sbuf *);
 1066 static size_t register_note(struct note_info_list *, int, outfunc_t, void *);
 1067 static int sbuf_drain_core_output(void *, const char *, int);
 1068 static int sbuf_drain_count(void *arg, const char *data, int len);
 1069 
 1070 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *);
 1071 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *);
 1072 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *);
 1073 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *);
 1074 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *);
 1075 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *);
 1076 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *);
 1077 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *);
 1078 static void note_procstat_files(void *, struct sbuf *, size_t *);
 1079 static void note_procstat_groups(void *, struct sbuf *, size_t *);
 1080 static void note_procstat_osrel(void *, struct sbuf *, size_t *);
 1081 static void note_procstat_rlimit(void *, struct sbuf *, size_t *);
 1082 static void note_procstat_umask(void *, struct sbuf *, size_t *);
 1083 static void note_procstat_vmmap(void *, struct sbuf *, size_t *);
 1084 
 1085 #ifdef COMPRESS_USER_CORES
 1086 extern int compress_user_cores;
 1087 extern int compress_user_cores_gzlevel;
 1088 #endif
 1089 
 1090 static int
 1091 core_output(struct vnode *vp, void *base, size_t len, off_t offset,
 1092     struct ucred *active_cred, struct ucred *file_cred,
 1093     struct thread *td, char *core_buf, gzFile gzfile) {
 1094 
 1095         int error;
 1096         if (gzfile) {
 1097 #ifdef COMPRESS_USER_CORES
 1098                 error = compress_core(gzfile, base, core_buf, len, td);
 1099 #else
 1100                 panic("shouldn't be here");
 1101 #endif
 1102         } else {
 1103                 error = vn_rdwr_inchunks(UIO_WRITE, vp, base, len, offset,
 1104                     UIO_USERSPACE, IO_UNIT | IO_DIRECT, active_cred, file_cred,
 1105                     NULL, td);
 1106         }
 1107         return (error);
 1108 }
 1109 
 1110 /* Coredump output parameters for sbuf drain routine. */
 1111 struct sbuf_drain_core_params {
 1112         off_t           offset;
 1113         struct ucred    *active_cred;
 1114         struct ucred    *file_cred;
 1115         struct thread   *td;
 1116         struct vnode    *vp;
 1117 #ifdef COMPRESS_USER_CORES
 1118         gzFile          gzfile;
 1119 #endif
 1120 };
 1121 
 1122 /*
 1123  * Drain into a core file.
 1124  */
 1125 static int
 1126 sbuf_drain_core_output(void *arg, const char *data, int len)
 1127 {
 1128         struct sbuf_drain_core_params *p;
 1129         int error, locked;
 1130 
 1131         p = (struct sbuf_drain_core_params *)arg;
 1132 
 1133         /*
 1134          * Some kern_proc out routines that print to this sbuf may
 1135          * call us with the process lock held. Draining with the
 1136          * non-sleepable lock held is unsafe. The lock is needed for
 1137          * those routines when dumping a live process. In our case we
 1138          * can safely release the lock before draining and acquire
 1139          * again after.
 1140          */
 1141         locked = PROC_LOCKED(p->td->td_proc);
 1142         if (locked)
 1143                 PROC_UNLOCK(p->td->td_proc);
 1144 #ifdef COMPRESS_USER_CORES
 1145         if (p->gzfile != Z_NULL)
 1146                 error = compress_core(p->gzfile, NULL, __DECONST(char *, data),
 1147                     len, p->td);
 1148         else
 1149 #endif
 1150                 error = vn_rdwr_inchunks(UIO_WRITE, p->vp,
 1151                     __DECONST(void *, data), len, p->offset, UIO_SYSSPACE,
 1152                     IO_UNIT | IO_DIRECT, p->active_cred, p->file_cred, NULL,
 1153                     p->td);
 1154         if (locked)
 1155                 PROC_LOCK(p->td->td_proc);
 1156         if (error != 0)
 1157                 return (-error);
 1158         p->offset += len;
 1159         return (len);
 1160 }
 1161 
 1162 /*
 1163  * Drain into a counter.
 1164  */
 1165 static int
 1166 sbuf_drain_count(void *arg, const char *data __unused, int len)
 1167 {
 1168         size_t *sizep;
 1169 
 1170         sizep = (size_t *)arg;
 1171         *sizep += len;
 1172         return (len);
 1173 }
 1174 
 1175 int
 1176 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags)
 1177 {
 1178         struct ucred *cred = td->td_ucred;
 1179         int error = 0;
 1180         struct sseg_closure seginfo;
 1181         struct note_info_list notelst;
 1182         struct note_info *ninfo;
 1183         void *hdr;
 1184         size_t hdrsize, notesz, coresize;
 1185 
 1186         gzFile gzfile = Z_NULL;
 1187         char *core_buf = NULL;
 1188 #ifdef COMPRESS_USER_CORES
 1189         char gzopen_flags[8];
 1190         char *p;
 1191         int doing_compress = flags & IMGACT_CORE_COMPRESS;
 1192 #endif
 1193 
 1194         hdr = NULL;
 1195         TAILQ_INIT(&notelst);
 1196 
 1197 #ifdef COMPRESS_USER_CORES
 1198         if (doing_compress) {
 1199                 p = gzopen_flags;
 1200                 *p++ = 'w';
 1201                 if (compress_user_cores_gzlevel >= 0 &&
 1202                     compress_user_cores_gzlevel <= 9)
 1203                         *p++ = '' + compress_user_cores_gzlevel;
 1204                 *p = 0;
 1205                 gzfile = gz_open("", gzopen_flags, vp);
 1206                 if (gzfile == Z_NULL) {
 1207                         error = EFAULT;
 1208                         goto done;
 1209                 }
 1210                 core_buf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO);
 1211                 if (!core_buf) {
 1212                         error = ENOMEM;
 1213                         goto done;
 1214                 }
 1215         }
 1216 #endif
 1217 
 1218         /* Size the program segments. */
 1219         seginfo.count = 0;
 1220         seginfo.size = 0;
 1221         each_writable_segment(td, cb_size_segment, &seginfo);
 1222 
 1223         /*
 1224          * Collect info about the core file header area.
 1225          */
 1226         hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count);
 1227         __elfN(prepare_notes)(td, &notelst, &notesz);
 1228         coresize = round_page(hdrsize + notesz) + seginfo.size;
 1229 
 1230 #ifdef RACCT
 1231         PROC_LOCK(td->td_proc);
 1232         error = racct_add(td->td_proc, RACCT_CORE, coresize);
 1233         PROC_UNLOCK(td->td_proc);
 1234         if (error != 0) {
 1235                 error = EFAULT;
 1236                 goto done;
 1237         }
 1238 #endif
 1239         if (coresize >= limit) {
 1240                 error = EFAULT;
 1241                 goto done;
 1242         }
 1243 
 1244         /*
 1245          * Allocate memory for building the header, fill it up,
 1246          * and write it out following the notes.
 1247          */
 1248         hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
 1249         if (hdr == NULL) {
 1250                 error = EINVAL;
 1251                 goto done;
 1252         }
 1253         error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize,
 1254             &notelst, notesz, gzfile);
 1255 
 1256         /* Write the contents of all of the writable segments. */
 1257         if (error == 0) {
 1258                 Elf_Phdr *php;
 1259                 off_t offset;
 1260                 int i;
 1261 
 1262                 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
 1263                 offset = round_page(hdrsize + notesz);
 1264                 for (i = 0; i < seginfo.count; i++) {
 1265                         error = core_output(vp, (caddr_t)(uintptr_t)php->p_vaddr,
 1266                             php->p_filesz, offset, cred, NOCRED, curthread, core_buf, gzfile);
 1267                         if (error != 0)
 1268                                 break;
 1269                         offset += php->p_filesz;
 1270                         php++;
 1271                 }
 1272         }
 1273         if (error) {
 1274                 log(LOG_WARNING,
 1275                     "Failed to write core file for process %s (error %d)\n",
 1276                     curproc->p_comm, error);
 1277         }
 1278 
 1279 done:
 1280 #ifdef COMPRESS_USER_CORES
 1281         if (core_buf)
 1282                 free(core_buf, M_TEMP);
 1283         if (gzfile)
 1284                 gzclose(gzfile);
 1285 #endif
 1286         while ((ninfo = TAILQ_FIRST(&notelst)) != NULL) {
 1287                 TAILQ_REMOVE(&notelst, ninfo, link);
 1288                 free(ninfo, M_TEMP);
 1289         }
 1290         if (hdr != NULL)
 1291                 free(hdr, M_TEMP);
 1292 
 1293         return (error);
 1294 }
 1295 
 1296 /*
 1297  * A callback for each_writable_segment() to write out the segment's
 1298  * program header entry.
 1299  */
 1300 static void
 1301 cb_put_phdr(entry, closure)
 1302         vm_map_entry_t entry;
 1303         void *closure;
 1304 {
 1305         struct phdr_closure *phc = (struct phdr_closure *)closure;
 1306         Elf_Phdr *phdr = phc->phdr;
 1307 
 1308         phc->offset = round_page(phc->offset);
 1309 
 1310         phdr->p_type = PT_LOAD;
 1311         phdr->p_offset = phc->offset;
 1312         phdr->p_vaddr = entry->start;
 1313         phdr->p_paddr = 0;
 1314         phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
 1315         phdr->p_align = PAGE_SIZE;
 1316         phdr->p_flags = __elfN(untrans_prot)(entry->protection);
 1317 
 1318         phc->offset += phdr->p_filesz;
 1319         phc->phdr++;
 1320 }
 1321 
 1322 /*
 1323  * A callback for each_writable_segment() to gather information about
 1324  * the number of segments and their total size.
 1325  */
 1326 static void
 1327 cb_size_segment(entry, closure)
 1328         vm_map_entry_t entry;
 1329         void *closure;
 1330 {
 1331         struct sseg_closure *ssc = (struct sseg_closure *)closure;
 1332 
 1333         ssc->count++;
 1334         ssc->size += entry->end - entry->start;
 1335 }
 1336 
 1337 /*
 1338  * For each writable segment in the process's memory map, call the given
 1339  * function with a pointer to the map entry and some arbitrary
 1340  * caller-supplied data.
 1341  */
 1342 static void
 1343 each_writable_segment(td, func, closure)
 1344         struct thread *td;
 1345         segment_callback func;
 1346         void *closure;
 1347 {
 1348         struct proc *p = td->td_proc;
 1349         vm_map_t map = &p->p_vmspace->vm_map;
 1350         vm_map_entry_t entry;
 1351         vm_object_t backing_object, object;
 1352         boolean_t ignore_entry;
 1353 
 1354         vm_map_lock_read(map);
 1355         for (entry = map->header.next; entry != &map->header;
 1356             entry = entry->next) {
 1357                 /*
 1358                  * Don't dump inaccessible mappings, deal with legacy
 1359                  * coredump mode.
 1360                  *
 1361                  * Note that read-only segments related to the elf binary
 1362                  * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
 1363                  * need to arbitrarily ignore such segments.
 1364                  */
 1365                 if (elf_legacy_coredump) {
 1366                         if ((entry->protection & VM_PROT_RW) != VM_PROT_RW)
 1367                                 continue;
 1368                 } else {
 1369                         if ((entry->protection & VM_PROT_ALL) == 0)
 1370                                 continue;
 1371                 }
 1372 
 1373                 /*
 1374                  * Dont include memory segment in the coredump if
 1375                  * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
 1376                  * madvise(2).  Do not dump submaps (i.e. parts of the
 1377                  * kernel map).
 1378                  */
 1379                 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP))
 1380                         continue;
 1381 
 1382                 if ((object = entry->object.vm_object) == NULL)
 1383                         continue;
 1384 
 1385                 /* Ignore memory-mapped devices and such things. */
 1386                 VM_OBJECT_RLOCK(object);
 1387                 while ((backing_object = object->backing_object) != NULL) {
 1388                         VM_OBJECT_RLOCK(backing_object);
 1389                         VM_OBJECT_RUNLOCK(object);
 1390                         object = backing_object;
 1391                 }
 1392                 ignore_entry = object->type != OBJT_DEFAULT &&
 1393                     object->type != OBJT_SWAP && object->type != OBJT_VNODE;
 1394                 VM_OBJECT_RUNLOCK(object);
 1395                 if (ignore_entry)
 1396                         continue;
 1397 
 1398                 (*func)(entry, closure);
 1399         }
 1400         vm_map_unlock_read(map);
 1401 }
 1402 
 1403 /*
 1404  * Write the core file header to the file, including padding up to
 1405  * the page boundary.
 1406  */
 1407 static int
 1408 __elfN(corehdr)(struct thread *td, struct vnode *vp, struct ucred *cred,
 1409     int numsegs, void *hdr, size_t hdrsize, struct note_info_list *notelst,
 1410     size_t notesz, gzFile gzfile)
 1411 {
 1412         struct sbuf_drain_core_params params;
 1413         struct note_info *ninfo;
 1414         struct sbuf *sb;
 1415         int error;
 1416 
 1417         /* Fill in the header. */
 1418         bzero(hdr, hdrsize);
 1419         __elfN(puthdr)(td, hdr, hdrsize, numsegs, notesz);
 1420 
 1421         params.offset = 0;
 1422         params.active_cred = cred;
 1423         params.file_cred = NOCRED;
 1424         params.td = td;
 1425         params.vp = vp;
 1426 #ifdef COMPRESS_USER_CORES
 1427         params.gzfile = gzfile;
 1428 #endif
 1429         sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN);
 1430         sbuf_set_drain(sb, sbuf_drain_core_output, &params);
 1431         sbuf_start_section(sb, NULL);
 1432         sbuf_bcat(sb, hdr, hdrsize);
 1433         TAILQ_FOREACH(ninfo, notelst, link)
 1434             __elfN(putnote)(ninfo, sb);
 1435         /* Align up to a page boundary for the program segments. */
 1436         sbuf_end_section(sb, -1, PAGE_SIZE, 0);
 1437         error = sbuf_finish(sb);
 1438         sbuf_delete(sb);
 1439 
 1440         return (error);
 1441 }
 1442 
 1443 static void
 1444 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list,
 1445     size_t *sizep)
 1446 {
 1447         struct proc *p;
 1448         struct thread *thr;
 1449         size_t size;
 1450 
 1451         p = td->td_proc;
 1452         size = 0;
 1453 
 1454         size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p);
 1455 
 1456         /*
 1457          * To have the debugger select the right thread (LWP) as the initial
 1458          * thread, we dump the state of the thread passed to us in td first.
 1459          * This is the thread that causes the core dump and thus likely to
 1460          * be the right thread one wants to have selected in the debugger.
 1461          */
 1462         thr = td;
 1463         while (thr != NULL) {
 1464                 size += register_note(list, NT_PRSTATUS,
 1465                     __elfN(note_prstatus), thr);
 1466                 size += register_note(list, NT_FPREGSET,
 1467                     __elfN(note_fpregset), thr);
 1468                 size += register_note(list, NT_THRMISC,
 1469                     __elfN(note_thrmisc), thr);
 1470                 size += register_note(list, -1,
 1471                     __elfN(note_threadmd), thr);
 1472 
 1473                 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) :
 1474                     TAILQ_NEXT(thr, td_plist);
 1475                 if (thr == td)
 1476                         thr = TAILQ_NEXT(thr, td_plist);
 1477         }
 1478 
 1479         size += register_note(list, NT_PROCSTAT_PROC,
 1480             __elfN(note_procstat_proc), p);
 1481         size += register_note(list, NT_PROCSTAT_FILES,
 1482             note_procstat_files, p);
 1483         size += register_note(list, NT_PROCSTAT_VMMAP,
 1484             note_procstat_vmmap, p);
 1485         size += register_note(list, NT_PROCSTAT_GROUPS,
 1486             note_procstat_groups, p);
 1487         size += register_note(list, NT_PROCSTAT_UMASK,
 1488             note_procstat_umask, p);
 1489         size += register_note(list, NT_PROCSTAT_RLIMIT,
 1490             note_procstat_rlimit, p);
 1491         size += register_note(list, NT_PROCSTAT_OSREL,
 1492             note_procstat_osrel, p);
 1493         size += register_note(list, NT_PROCSTAT_PSSTRINGS,
 1494             __elfN(note_procstat_psstrings), p);
 1495         size += register_note(list, NT_PROCSTAT_AUXV,
 1496             __elfN(note_procstat_auxv), p);
 1497 
 1498         *sizep = size;
 1499 }
 1500 
 1501 static void
 1502 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs,
 1503     size_t notesz)
 1504 {
 1505         Elf_Ehdr *ehdr;
 1506         Elf_Phdr *phdr;
 1507         struct phdr_closure phc;
 1508 
 1509         ehdr = (Elf_Ehdr *)hdr;
 1510         phdr = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr));
 1511 
 1512         ehdr->e_ident[EI_MAG0] = ELFMAG0;
 1513         ehdr->e_ident[EI_MAG1] = ELFMAG1;
 1514         ehdr->e_ident[EI_MAG2] = ELFMAG2;
 1515         ehdr->e_ident[EI_MAG3] = ELFMAG3;
 1516         ehdr->e_ident[EI_CLASS] = ELF_CLASS;
 1517         ehdr->e_ident[EI_DATA] = ELF_DATA;
 1518         ehdr->e_ident[EI_VERSION] = EV_CURRENT;
 1519         ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
 1520         ehdr->e_ident[EI_ABIVERSION] = 0;
 1521         ehdr->e_ident[EI_PAD] = 0;
 1522         ehdr->e_type = ET_CORE;
 1523 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
 1524         ehdr->e_machine = ELF_ARCH32;
 1525 #else
 1526         ehdr->e_machine = ELF_ARCH;
 1527 #endif
 1528         ehdr->e_version = EV_CURRENT;
 1529         ehdr->e_entry = 0;
 1530         ehdr->e_phoff = sizeof(Elf_Ehdr);
 1531         ehdr->e_flags = 0;
 1532         ehdr->e_ehsize = sizeof(Elf_Ehdr);
 1533         ehdr->e_phentsize = sizeof(Elf_Phdr);
 1534         ehdr->e_phnum = numsegs + 1;
 1535         ehdr->e_shentsize = sizeof(Elf_Shdr);
 1536         ehdr->e_shnum = 0;
 1537         ehdr->e_shstrndx = SHN_UNDEF;
 1538 
 1539         /*
 1540          * Fill in the program header entries.
 1541          */
 1542 
 1543         /* The note segement. */
 1544         phdr->p_type = PT_NOTE;
 1545         phdr->p_offset = hdrsize;
 1546         phdr->p_vaddr = 0;
 1547         phdr->p_paddr = 0;
 1548         phdr->p_filesz = notesz;
 1549         phdr->p_memsz = 0;
 1550         phdr->p_flags = PF_R;
 1551         phdr->p_align = ELF_NOTE_ROUNDSIZE;
 1552         phdr++;
 1553 
 1554         /* All the writable segments from the program. */
 1555         phc.phdr = phdr;
 1556         phc.offset = round_page(hdrsize + notesz);
 1557         each_writable_segment(td, cb_put_phdr, &phc);
 1558 }
 1559 
 1560 static size_t
 1561 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg)
 1562 {
 1563         struct note_info *ninfo;
 1564         size_t size, notesize;
 1565 
 1566         size = 0;
 1567         out(arg, NULL, &size);
 1568         ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK);
 1569         ninfo->type = type;
 1570         ninfo->outfunc = out;
 1571         ninfo->outarg = arg;
 1572         ninfo->outsize = size;
 1573         TAILQ_INSERT_TAIL(list, ninfo, link);
 1574 
 1575         if (type == -1)
 1576                 return (size);
 1577 
 1578         notesize = sizeof(Elf_Note) +           /* note header */
 1579             roundup2(8, ELF_NOTE_ROUNDSIZE) +   /* note name ("FreeBSD") */
 1580             roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
 1581 
 1582         return (notesize);
 1583 }
 1584 
 1585 static void
 1586 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb)
 1587 {
 1588         Elf_Note note;
 1589         ssize_t old_len;
 1590 
 1591         if (ninfo->type == -1) {
 1592                 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
 1593                 return;
 1594         }
 1595 
 1596         note.n_namesz = 8; /* strlen("FreeBSD") + 1 */
 1597         note.n_descsz = ninfo->outsize;
 1598         note.n_type = ninfo->type;
 1599 
 1600         sbuf_bcat(sb, &note, sizeof(note));
 1601         sbuf_start_section(sb, &old_len);
 1602         sbuf_bcat(sb, "FreeBSD", note.n_namesz);
 1603         sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
 1604         if (note.n_descsz == 0)
 1605                 return;
 1606         sbuf_start_section(sb, &old_len);
 1607         ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
 1608         sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
 1609 }
 1610 
 1611 /*
 1612  * Miscellaneous note out functions.
 1613  */
 1614 
 1615 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
 1616 #include <compat/freebsd32/freebsd32.h>
 1617 
 1618 typedef struct prstatus32 elf_prstatus_t;
 1619 typedef struct prpsinfo32 elf_prpsinfo_t;
 1620 typedef struct fpreg32 elf_prfpregset_t;
 1621 typedef struct fpreg32 elf_fpregset_t;
 1622 typedef struct reg32 elf_gregset_t;
 1623 typedef struct thrmisc32 elf_thrmisc_t;
 1624 #define ELF_KERN_PROC_MASK      KERN_PROC_MASK32
 1625 typedef struct kinfo_proc32 elf_kinfo_proc_t;
 1626 typedef uint32_t elf_ps_strings_t;
 1627 #else
 1628 typedef prstatus_t elf_prstatus_t;
 1629 typedef prpsinfo_t elf_prpsinfo_t;
 1630 typedef prfpregset_t elf_prfpregset_t;
 1631 typedef prfpregset_t elf_fpregset_t;
 1632 typedef gregset_t elf_gregset_t;
 1633 typedef thrmisc_t elf_thrmisc_t;
 1634 #define ELF_KERN_PROC_MASK      0
 1635 typedef struct kinfo_proc elf_kinfo_proc_t;
 1636 typedef vm_offset_t elf_ps_strings_t;
 1637 #endif
 1638 
 1639 static void
 1640 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep)
 1641 {
 1642         struct proc *p;
 1643         elf_prpsinfo_t *psinfo;
 1644 
 1645         p = (struct proc *)arg;
 1646         if (sb != NULL) {
 1647                 KASSERT(*sizep == sizeof(*psinfo), ("invalid size"));
 1648                 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK);
 1649                 psinfo->pr_version = PRPSINFO_VERSION;
 1650                 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t);
 1651                 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
 1652                 /*
 1653                  * XXX - We don't fill in the command line arguments properly
 1654                  * yet.
 1655                  */
 1656                 strlcpy(psinfo->pr_psargs, p->p_comm,
 1657                     sizeof(psinfo->pr_psargs));
 1658 
 1659                 sbuf_bcat(sb, psinfo, sizeof(*psinfo));
 1660                 free(psinfo, M_TEMP);
 1661         }
 1662         *sizep = sizeof(*psinfo);
 1663 }
 1664 
 1665 static void
 1666 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep)
 1667 {
 1668         struct thread *td;
 1669         elf_prstatus_t *status;
 1670 
 1671         td = (struct thread *)arg;
 1672         if (sb != NULL) {
 1673                 KASSERT(*sizep == sizeof(*status), ("invalid size"));
 1674                 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK);
 1675                 status->pr_version = PRSTATUS_VERSION;
 1676                 status->pr_statussz = sizeof(elf_prstatus_t);
 1677                 status->pr_gregsetsz = sizeof(elf_gregset_t);
 1678                 status->pr_fpregsetsz = sizeof(elf_fpregset_t);
 1679                 status->pr_osreldate = osreldate;
 1680                 status->pr_cursig = td->td_proc->p_sig;
 1681                 status->pr_pid = td->td_tid;
 1682 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
 1683                 fill_regs32(td, &status->pr_reg);
 1684 #else
 1685                 fill_regs(td, &status->pr_reg);
 1686 #endif
 1687                 sbuf_bcat(sb, status, sizeof(*status));
 1688                 free(status, M_TEMP);
 1689         }
 1690         *sizep = sizeof(*status);
 1691 }
 1692 
 1693 static void
 1694 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep)
 1695 {
 1696         struct thread *td;
 1697         elf_prfpregset_t *fpregset;
 1698 
 1699         td = (struct thread *)arg;
 1700         if (sb != NULL) {
 1701                 KASSERT(*sizep == sizeof(*fpregset), ("invalid size"));
 1702                 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK);
 1703 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
 1704                 fill_fpregs32(td, fpregset);
 1705 #else
 1706                 fill_fpregs(td, fpregset);
 1707 #endif
 1708                 sbuf_bcat(sb, fpregset, sizeof(*fpregset));
 1709                 free(fpregset, M_TEMP);
 1710         }
 1711         *sizep = sizeof(*fpregset);
 1712 }
 1713 
 1714 static void
 1715 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep)
 1716 {
 1717         struct thread *td;
 1718         elf_thrmisc_t thrmisc;
 1719 
 1720         td = (struct thread *)arg;
 1721         if (sb != NULL) {
 1722                 KASSERT(*sizep == sizeof(thrmisc), ("invalid size"));
 1723                 bzero(&thrmisc._pad, sizeof(thrmisc._pad));
 1724                 strcpy(thrmisc.pr_tname, td->td_name);
 1725                 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc));
 1726         }
 1727         *sizep = sizeof(thrmisc);
 1728 }
 1729 
 1730 /*
 1731  * Allow for MD specific notes, as well as any MD
 1732  * specific preparations for writing MI notes.
 1733  */
 1734 static void
 1735 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep)
 1736 {
 1737         struct thread *td;
 1738         void *buf;
 1739         size_t size;
 1740 
 1741         td = (struct thread *)arg;
 1742         size = *sizep;
 1743         if (size != 0 && sb != NULL)
 1744                 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK);
 1745         else
 1746                 buf = NULL;
 1747         size = 0;
 1748         __elfN(dump_thread)(td, buf, &size);
 1749         KASSERT(*sizep == size, ("invalid size"));
 1750         if (size != 0 && sb != NULL)
 1751                 sbuf_bcat(sb, buf, size);
 1752         free(buf, M_TEMP);
 1753         *sizep = size;
 1754 }
 1755 
 1756 #ifdef KINFO_PROC_SIZE
 1757 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
 1758 #endif
 1759 
 1760 static void
 1761 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep)
 1762 {
 1763         struct proc *p;
 1764         size_t size;
 1765         int structsize;
 1766 
 1767         p = (struct proc *)arg;
 1768         size = sizeof(structsize) + p->p_numthreads *
 1769             sizeof(elf_kinfo_proc_t);
 1770 
 1771         if (sb != NULL) {
 1772                 KASSERT(*sizep == size, ("invalid size"));
 1773                 structsize = sizeof(elf_kinfo_proc_t);
 1774                 sbuf_bcat(sb, &structsize, sizeof(structsize));
 1775                 PROC_LOCK(p);
 1776                 kern_proc_out(p, sb, ELF_KERN_PROC_MASK);
 1777         }
 1778         *sizep = size;
 1779 }
 1780 
 1781 #ifdef KINFO_FILE_SIZE
 1782 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE);
 1783 #endif
 1784 
 1785 static void
 1786 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep)
 1787 {
 1788         struct proc *p;
 1789         size_t size;
 1790         int structsize;
 1791 
 1792         p = (struct proc *)arg;
 1793         if (sb == NULL) {
 1794                 size = 0;
 1795                 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
 1796                 sbuf_set_drain(sb, sbuf_drain_count, &size);
 1797                 sbuf_bcat(sb, &structsize, sizeof(structsize));
 1798                 PROC_LOCK(p);
 1799                 kern_proc_filedesc_out(p, sb, -1);
 1800                 sbuf_finish(sb);
 1801                 sbuf_delete(sb);
 1802                 *sizep = size;
 1803         } else {
 1804                 structsize = sizeof(struct kinfo_file);
 1805                 sbuf_bcat(sb, &structsize, sizeof(structsize));
 1806                 PROC_LOCK(p);
 1807                 kern_proc_filedesc_out(p, sb, -1);
 1808         }
 1809 }
 1810 
 1811 #ifdef KINFO_VMENTRY_SIZE
 1812 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE);
 1813 #endif
 1814 
 1815 static void
 1816 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep)
 1817 {
 1818         struct proc *p;
 1819         size_t size;
 1820         int structsize;
 1821 
 1822         p = (struct proc *)arg;
 1823         if (sb == NULL) {
 1824                 size = 0;
 1825                 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
 1826                 sbuf_set_drain(sb, sbuf_drain_count, &size);
 1827                 sbuf_bcat(sb, &structsize, sizeof(structsize));
 1828                 PROC_LOCK(p);
 1829                 kern_proc_vmmap_out(p, sb);
 1830                 sbuf_finish(sb);
 1831                 sbuf_delete(sb);
 1832                 *sizep = size;
 1833         } else {
 1834                 structsize = sizeof(struct kinfo_vmentry);
 1835                 sbuf_bcat(sb, &structsize, sizeof(structsize));
 1836                 PROC_LOCK(p);
 1837                 kern_proc_vmmap_out(p, sb);
 1838         }
 1839 }
 1840 
 1841 static void
 1842 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep)
 1843 {
 1844         struct proc *p;
 1845         size_t size;
 1846         int structsize;
 1847 
 1848         p = (struct proc *)arg;
 1849         size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t);
 1850         if (sb != NULL) {
 1851                 KASSERT(*sizep == size, ("invalid size"));
 1852                 structsize = sizeof(gid_t);
 1853                 sbuf_bcat(sb, &structsize, sizeof(structsize));
 1854                 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups *
 1855                     sizeof(gid_t));
 1856         }
 1857         *sizep = size;
 1858 }
 1859 
 1860 static void
 1861 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep)
 1862 {
 1863         struct proc *p;
 1864         size_t size;
 1865         int structsize;
 1866 
 1867         p = (struct proc *)arg;
 1868         size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask);
 1869         if (sb != NULL) {
 1870                 KASSERT(*sizep == size, ("invalid size"));
 1871                 structsize = sizeof(p->p_fd->fd_cmask);
 1872                 sbuf_bcat(sb, &structsize, sizeof(structsize));
 1873                 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask));
 1874         }
 1875         *sizep = size;
 1876 }
 1877 
 1878 static void
 1879 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep)
 1880 {
 1881         struct proc *p;
 1882         struct rlimit rlim[RLIM_NLIMITS];
 1883         size_t size;
 1884         int structsize, i;
 1885 
 1886         p = (struct proc *)arg;
 1887         size = sizeof(structsize) + sizeof(rlim);
 1888         if (sb != NULL) {
 1889                 KASSERT(*sizep == size, ("invalid size"));
 1890                 structsize = sizeof(rlim);
 1891                 sbuf_bcat(sb, &structsize, sizeof(structsize));
 1892                 PROC_LOCK(p);
 1893                 for (i = 0; i < RLIM_NLIMITS; i++)
 1894                         lim_rlimit(p, i, &rlim[i]);
 1895                 PROC_UNLOCK(p);
 1896                 sbuf_bcat(sb, rlim, sizeof(rlim));
 1897         }
 1898         *sizep = size;
 1899 }
 1900 
 1901 static void
 1902 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep)
 1903 {
 1904         struct proc *p;
 1905         size_t size;
 1906         int structsize;
 1907 
 1908         p = (struct proc *)arg;
 1909         size = sizeof(structsize) + sizeof(p->p_osrel);
 1910         if (sb != NULL) {
 1911                 KASSERT(*sizep == size, ("invalid size"));
 1912                 structsize = sizeof(p->p_osrel);
 1913                 sbuf_bcat(sb, &structsize, sizeof(structsize));
 1914                 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel));
 1915         }
 1916         *sizep = size;
 1917 }
 1918 
 1919 static void
 1920 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep)
 1921 {
 1922         struct proc *p;
 1923         elf_ps_strings_t ps_strings;
 1924         size_t size;
 1925         int structsize;
 1926 
 1927         p = (struct proc *)arg;
 1928         size = sizeof(structsize) + sizeof(ps_strings);
 1929         if (sb != NULL) {
 1930                 KASSERT(*sizep == size, ("invalid size"));
 1931                 structsize = sizeof(ps_strings);
 1932 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
 1933                 ps_strings = PTROUT(p->p_sysent->sv_psstrings);
 1934 #else
 1935                 ps_strings = p->p_sysent->sv_psstrings;
 1936 #endif
 1937                 sbuf_bcat(sb, &structsize, sizeof(structsize));
 1938                 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings));
 1939         }
 1940         *sizep = size;
 1941 }
 1942 
 1943 static void
 1944 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep)
 1945 {
 1946         struct proc *p;
 1947         size_t size;
 1948         int structsize;
 1949 
 1950         p = (struct proc *)arg;
 1951         if (sb == NULL) {
 1952                 size = 0;
 1953                 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
 1954                 sbuf_set_drain(sb, sbuf_drain_count, &size);
 1955                 sbuf_bcat(sb, &structsize, sizeof(structsize));
 1956                 PHOLD(p);
 1957                 proc_getauxv(curthread, p, sb);
 1958                 PRELE(p);
 1959                 sbuf_finish(sb);
 1960                 sbuf_delete(sb);
 1961                 *sizep = size;
 1962         } else {
 1963                 structsize = sizeof(Elf_Auxinfo);
 1964                 sbuf_bcat(sb, &structsize, sizeof(structsize));
 1965                 PHOLD(p);
 1966                 proc_getauxv(curthread, p, sb);
 1967                 PRELE(p);
 1968         }
 1969 }
 1970 
 1971 static boolean_t
 1972 __elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote,
 1973     int32_t *osrel, const Elf_Phdr *pnote)
 1974 {
 1975         const Elf_Note *note, *note0, *note_end;
 1976         const char *note_name;
 1977         int i;
 1978 
 1979         if (pnote == NULL || pnote->p_offset > PAGE_SIZE ||
 1980             pnote->p_filesz > PAGE_SIZE - pnote->p_offset)
 1981                 return (FALSE);
 1982 
 1983         note = note0 = (const Elf_Note *)(imgp->image_header + pnote->p_offset);
 1984         note_end = (const Elf_Note *)(imgp->image_header +
 1985             pnote->p_offset + pnote->p_filesz);
 1986         for (i = 0; i < 100 && note >= note0 && note < note_end; i++) {
 1987                 if (!aligned(note, Elf32_Addr) || (const char *)note_end -
 1988                     (const char *)note < sizeof(Elf_Note))
 1989                         return (FALSE);
 1990                 if (note->n_namesz != checknote->hdr.n_namesz ||
 1991                     note->n_descsz != checknote->hdr.n_descsz ||
 1992                     note->n_type != checknote->hdr.n_type)
 1993                         goto nextnote;
 1994                 note_name = (const char *)(note + 1);
 1995                 if (note_name + checknote->hdr.n_namesz >=
 1996                     (const char *)note_end || strncmp(checknote->vendor,
 1997                     note_name, checknote->hdr.n_namesz) != 0)
 1998                         goto nextnote;
 1999 
 2000                 /*
 2001                  * Fetch the osreldate for binary
 2002                  * from the ELF OSABI-note if necessary.
 2003                  */
 2004                 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 &&
 2005                     checknote->trans_osrel != NULL)
 2006                         return (checknote->trans_osrel(note, osrel));
 2007                 return (TRUE);
 2008 
 2009 nextnote:
 2010                 note = (const Elf_Note *)((const char *)(note + 1) +
 2011                     roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) +
 2012                     roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE));
 2013         }
 2014 
 2015         return (FALSE);
 2016 }
 2017 
 2018 /*
 2019  * Try to find the appropriate ABI-note section for checknote,
 2020  * fetch the osreldate for binary from the ELF OSABI-note. Only the
 2021  * first page of the image is searched, the same as for headers.
 2022  */
 2023 static boolean_t
 2024 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote,
 2025     int32_t *osrel)
 2026 {
 2027         const Elf_Phdr *phdr;
 2028         const Elf_Ehdr *hdr;
 2029         int i;
 2030 
 2031         hdr = (const Elf_Ehdr *)imgp->image_header;
 2032         phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
 2033 
 2034         for (i = 0; i < hdr->e_phnum; i++) {
 2035                 if (phdr[i].p_type == PT_NOTE &&
 2036                     __elfN(parse_notes)(imgp, checknote, osrel, &phdr[i]))
 2037                         return (TRUE);
 2038         }
 2039         return (FALSE);
 2040 
 2041 }
 2042 
 2043 /*
 2044  * Tell kern_execve.c about it, with a little help from the linker.
 2045  */
 2046 static struct execsw __elfN(execsw) = {
 2047         __CONCAT(exec_, __elfN(imgact)),
 2048         __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
 2049 };
 2050 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
 2051 
 2052 #ifdef COMPRESS_USER_CORES
 2053 /*
 2054  * Compress and write out a core segment for a user process.
 2055  *
 2056  * 'inbuf' is the starting address of a VM segment in the process' address
 2057  * space that is to be compressed and written out to the core file.  'dest_buf'
 2058  * is a buffer in the kernel's address space.  The segment is copied from 
 2059  * 'inbuf' to 'dest_buf' first before being processed by the compression
 2060  * routine gzwrite().  This copying is necessary because the content of the VM
 2061  * segment may change between the compression pass and the crc-computation pass
 2062  * in gzwrite().  This is because realtime threads may preempt the UNIX kernel.
 2063  *
 2064  * If inbuf is NULL it is assumed that data is already copied to 'dest_buf'.
 2065  */
 2066 static int
 2067 compress_core (gzFile file, char *inbuf, char *dest_buf, unsigned int len,
 2068     struct thread *td)
 2069 {
 2070         int len_compressed;
 2071         int error = 0;
 2072         unsigned int chunk_len;
 2073 
 2074         while (len) {
 2075                 if (inbuf != NULL) {
 2076                         chunk_len = (len > CORE_BUF_SIZE) ? CORE_BUF_SIZE : len;
 2077                         copyin(inbuf, dest_buf, chunk_len);
 2078                         inbuf += chunk_len;
 2079                 } else {
 2080                         chunk_len = len;
 2081                 }
 2082                 len_compressed = gzwrite(file, dest_buf, chunk_len);
 2083 
 2084                 EVENTHANDLER_INVOKE(app_coredump_progress, td, len_compressed);
 2085 
 2086                 if ((unsigned int)len_compressed != chunk_len) {
 2087                         log(LOG_WARNING,
 2088                             "compress_core: length mismatch (0x%x returned, "
 2089                             "0x%x expected)\n", len_compressed, chunk_len);
 2090                         EVENTHANDLER_INVOKE(app_coredump_error, td,
 2091                             "compress_core: length mismatch %x -> %x",
 2092                             chunk_len, len_compressed);
 2093                         error = EFAULT;
 2094                         break;
 2095                 }
 2096                 len -= chunk_len;
 2097                 maybe_yield();
 2098         }
 2099 
 2100         return (error);
 2101 }
 2102 #endif /* COMPRESS_USER_CORES */
 2103 
 2104 static vm_prot_t
 2105 __elfN(trans_prot)(Elf_Word flags)
 2106 {
 2107         vm_prot_t prot;
 2108 
 2109         prot = 0;
 2110         if (flags & PF_X)
 2111                 prot |= VM_PROT_EXECUTE;
 2112         if (flags & PF_W)
 2113                 prot |= VM_PROT_WRITE;
 2114         if (flags & PF_R)
 2115                 prot |= VM_PROT_READ;
 2116 #if __ELF_WORD_SIZE == 32
 2117 #if defined(__amd64__) || defined(__ia64__)
 2118         if (i386_read_exec && (flags & PF_R))
 2119                 prot |= VM_PROT_EXECUTE;
 2120 #endif
 2121 #endif
 2122         return (prot);
 2123 }
 2124 
 2125 static Elf_Word
 2126 __elfN(untrans_prot)(vm_prot_t prot)
 2127 {
 2128         Elf_Word flags;
 2129 
 2130         flags = 0;
 2131         if (prot & VM_PROT_EXECUTE)
 2132                 flags |= PF_X;
 2133         if (prot & VM_PROT_READ)
 2134                 flags |= PF_R;
 2135         if (prot & VM_PROT_WRITE)
 2136                 flags |= PF_W;
 2137         return (flags);
 2138 }

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