2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2017 Dell EMC
5 * Copyright (c) 2000 David O'Brien
6 * Copyright (c) 1995-1996 Søren Schmidt
7 * Copyright (c) 1996 Peter Wemm
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer
15 * in this position and unchanged.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include "opt_capsicum.h"
39 #include <sys/param.h>
40 #include <sys/capsicum.h>
41 #include <sys/compressor.h>
43 #include <sys/fcntl.h>
44 #include <sys/imgact.h>
45 #include <sys/imgact_elf.h>
47 #include <sys/kernel.h>
49 #include <sys/malloc.h>
50 #include <sys/mount.h>
52 #include <sys/namei.h>
53 #include <sys/pioctl.h>
55 #include <sys/procfs.h>
56 #include <sys/ptrace.h>
57 #include <sys/racct.h>
58 #include <sys/resourcevar.h>
59 #include <sys/rwlock.h>
61 #include <sys/sf_buf.h>
63 #include <sys/systm.h>
64 #include <sys/signalvar.h>
67 #include <sys/syscall.h>
68 #include <sys/sysctl.h>
69 #include <sys/sysent.h>
70 #include <sys/vnode.h>
71 #include <sys/syslog.h>
72 #include <sys/eventhandler.h>
76 #include <vm/vm_kern.h>
77 #include <vm/vm_param.h>
79 #include <vm/vm_map.h>
80 #include <vm/vm_object.h>
81 #include <vm/vm_extern.h>
83 #include <machine/elf.h>
84 #include <machine/md_var.h>
86 #define ELF_NOTE_ROUNDSIZE 4
87 #define OLD_EI_BRAND 8
89 static int __elfN(check_header)(const Elf_Ehdr *hdr);
90 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp,
91 const char *interp, int interp_name_len, int32_t *osrel);
92 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
93 u_long *entry, size_t pagesize);
94 static int __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset,
95 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
97 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp);
98 static bool __elfN(freebsd_trans_osrel)(const Elf_Note *note,
100 static bool kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel);
101 static boolean_t __elfN(check_note)(struct image_params *imgp,
102 Elf_Brandnote *checknote, int32_t *osrel);
103 static vm_prot_t __elfN(trans_prot)(Elf_Word);
104 static Elf_Word __elfN(untrans_prot)(vm_prot_t);
106 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0,
109 #define CORE_BUF_SIZE (16 * 1024)
111 int __elfN(fallback_brand) = -1;
112 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
113 fallback_brand, CTLFLAG_RWTUN, &__elfN(fallback_brand), 0,
114 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort");
116 static int elf_legacy_coredump = 0;
117 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW,
118 &elf_legacy_coredump, 0,
119 "include all and only RW pages in core dumps");
121 int __elfN(nxstack) =
122 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */ || \
123 (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__)
128 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
129 nxstack, CTLFLAG_RW, &__elfN(nxstack), 0,
130 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack");
132 #if __ELF_WORD_SIZE == 32
133 #if defined(__amd64__)
134 int i386_read_exec = 0;
135 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0,
136 "enable execution from readable segments");
140 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS];
142 #define trunc_page_ps(va, ps) rounddown2(va, ps)
143 #define round_page_ps(va, ps) roundup2(va, ps)
144 #define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a))
146 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD";
148 Elf_Brandnote __elfN(freebsd_brandnote) = {
149 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR),
150 .hdr.n_descsz = sizeof(int32_t),
151 .hdr.n_type = NT_FREEBSD_ABI_TAG,
152 .vendor = FREEBSD_ABI_VENDOR,
153 .flags = BN_TRANSLATE_OSREL,
154 .trans_osrel = __elfN(freebsd_trans_osrel)
158 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel)
162 p = (uintptr_t)(note + 1);
163 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
164 *osrel = *(const int32_t *)(p);
169 static const char GNU_ABI_VENDOR[] = "GNU";
170 static int GNU_KFREEBSD_ABI_DESC = 3;
172 Elf_Brandnote __elfN(kfreebsd_brandnote) = {
173 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
174 .hdr.n_descsz = 16, /* XXX at least 16 */
176 .vendor = GNU_ABI_VENDOR,
177 .flags = BN_TRANSLATE_OSREL,
178 .trans_osrel = kfreebsd_trans_osrel
182 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel)
184 const Elf32_Word *desc;
187 p = (uintptr_t)(note + 1);
188 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
190 desc = (const Elf32_Word *)p;
191 if (desc[0] != GNU_KFREEBSD_ABI_DESC)
195 * Debian GNU/kFreeBSD embed the earliest compatible kernel version
196 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way.
198 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3];
204 __elfN(insert_brand_entry)(Elf_Brandinfo *entry)
208 for (i = 0; i < MAX_BRANDS; i++) {
209 if (elf_brand_list[i] == NULL) {
210 elf_brand_list[i] = entry;
214 if (i == MAX_BRANDS) {
215 printf("WARNING: %s: could not insert brandinfo entry: %p\n",
223 __elfN(remove_brand_entry)(Elf_Brandinfo *entry)
227 for (i = 0; i < MAX_BRANDS; i++) {
228 if (elf_brand_list[i] == entry) {
229 elf_brand_list[i] = NULL;
239 __elfN(brand_inuse)(Elf_Brandinfo *entry)
244 sx_slock(&allproc_lock);
245 FOREACH_PROC_IN_SYSTEM(p) {
246 if (p->p_sysent == entry->sysvec) {
251 sx_sunlock(&allproc_lock);
256 static Elf_Brandinfo *
257 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
258 int interp_name_len, int32_t *osrel)
260 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
261 Elf_Brandinfo *bi, *bi_m;
266 * We support four types of branding -- (1) the ELF EI_OSABI field
267 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
268 * branding w/in the ELF header, (3) path of the `interp_path'
269 * field, and (4) the ".note.ABI-tag" ELF section.
272 /* Look for an ".note.ABI-tag" ELF section */
274 for (i = 0; i < MAX_BRANDS; i++) {
275 bi = elf_brand_list[i];
278 if (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)
280 if (hdr->e_machine == bi->machine && (bi->flags &
281 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
282 ret = __elfN(check_note)(imgp, bi->brand_note, osrel);
283 /* Give brand a chance to veto check_note's guess */
284 if (ret && bi->header_supported)
285 ret = bi->header_supported(imgp);
287 * If note checker claimed the binary, but the
288 * interpreter path in the image does not
289 * match default one for the brand, try to
290 * search for other brands with the same
291 * interpreter. Either there is better brand
292 * with the right interpreter, or, failing
293 * this, we return first brand which accepted
294 * our note and, optionally, header.
296 if (ret && bi_m == NULL && interp != NULL &&
297 (bi->interp_path == NULL ||
298 (strlen(bi->interp_path) + 1 != interp_name_len ||
299 strncmp(interp, bi->interp_path, interp_name_len)
311 /* If the executable has a brand, search for it in the brand list. */
312 for (i = 0; i < MAX_BRANDS; i++) {
313 bi = elf_brand_list[i];
314 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 ||
315 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0))
317 if (hdr->e_machine == bi->machine &&
318 (hdr->e_ident[EI_OSABI] == bi->brand ||
319 (bi->compat_3_brand != NULL &&
320 strcmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
321 bi->compat_3_brand) == 0))) {
322 /* Looks good, but give brand a chance to veto */
323 if (bi->header_supported == NULL ||
324 bi->header_supported(imgp)) {
326 * Again, prefer strictly matching
329 if (interp_name_len == 0 &&
330 bi->interp_path == NULL)
332 if (bi->interp_path != NULL &&
333 strlen(bi->interp_path) + 1 ==
334 interp_name_len && strncmp(interp,
335 bi->interp_path, interp_name_len) == 0)
345 /* No known brand, see if the header is recognized by any brand */
346 for (i = 0; i < MAX_BRANDS; i++) {
347 bi = elf_brand_list[i];
348 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY ||
349 bi->header_supported == NULL)
351 if (hdr->e_machine == bi->machine) {
352 ret = bi->header_supported(imgp);
358 /* Lacking a known brand, search for a recognized interpreter. */
359 if (interp != NULL) {
360 for (i = 0; i < MAX_BRANDS; i++) {
361 bi = elf_brand_list[i];
362 if (bi == NULL || (bi->flags &
363 (BI_BRAND_NOTE_MANDATORY | BI_BRAND_ONLY_STATIC))
366 if (hdr->e_machine == bi->machine &&
367 bi->interp_path != NULL &&
368 /* ELF image p_filesz includes terminating zero */
369 strlen(bi->interp_path) + 1 == interp_name_len &&
370 strncmp(interp, bi->interp_path, interp_name_len)
371 == 0 && (bi->header_supported == NULL ||
372 bi->header_supported(imgp)))
377 /* Lacking a recognized interpreter, try the default brand */
378 for (i = 0; i < MAX_BRANDS; i++) {
379 bi = elf_brand_list[i];
380 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 ||
381 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0))
383 if (hdr->e_machine == bi->machine &&
384 __elfN(fallback_brand) == bi->brand &&
385 (bi->header_supported == NULL ||
386 bi->header_supported(imgp)))
393 __elfN(check_header)(const Elf_Ehdr *hdr)
399 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
400 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
401 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
402 hdr->e_phentsize != sizeof(Elf_Phdr) ||
403 hdr->e_version != ELF_TARG_VER)
407 * Make sure we have at least one brand for this machine.
410 for (i = 0; i < MAX_BRANDS; i++) {
411 bi = elf_brand_list[i];
412 if (bi != NULL && bi->machine == hdr->e_machine)
422 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
423 vm_offset_t start, vm_offset_t end, vm_prot_t prot)
430 * Create the page if it doesn't exist yet. Ignore errors.
432 vm_map_fixed(map, NULL, 0, trunc_page(start), round_page(end) -
433 trunc_page(start), VM_PROT_ALL, VM_PROT_ALL, MAP_CHECK_EXCL);
436 * Find the page from the underlying object.
438 if (object != NULL) {
439 sf = vm_imgact_map_page(object, offset);
441 return (KERN_FAILURE);
442 off = offset - trunc_page(offset);
443 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start,
445 vm_imgact_unmap_page(sf);
447 return (KERN_FAILURE);
450 return (KERN_SUCCESS);
454 __elfN(map_insert)(struct image_params *imgp, vm_map_t map, vm_object_t object,
455 vm_ooffset_t offset, vm_offset_t start, vm_offset_t end, vm_prot_t prot,
461 int error, locked, rv;
463 if (start != trunc_page(start)) {
464 rv = __elfN(map_partial)(map, object, offset, start,
465 round_page(start), prot);
466 if (rv != KERN_SUCCESS)
468 offset += round_page(start) - start;
469 start = round_page(start);
471 if (end != round_page(end)) {
472 rv = __elfN(map_partial)(map, object, offset +
473 trunc_page(end) - start, trunc_page(end), end, prot);
474 if (rv != KERN_SUCCESS)
476 end = trunc_page(end);
479 return (KERN_SUCCESS);
480 if ((offset & PAGE_MASK) != 0) {
482 * The mapping is not page aligned. This means that we have
485 rv = vm_map_fixed(map, NULL, 0, start, end - start,
486 prot | VM_PROT_WRITE, VM_PROT_ALL, MAP_CHECK_EXCL);
487 if (rv != KERN_SUCCESS)
490 return (KERN_SUCCESS);
491 for (; start < end; start += sz) {
492 sf = vm_imgact_map_page(object, offset);
494 return (KERN_FAILURE);
495 off = offset - trunc_page(offset);
497 if (sz > PAGE_SIZE - off)
498 sz = PAGE_SIZE - off;
499 error = copyout((caddr_t)sf_buf_kva(sf) + off,
501 vm_imgact_unmap_page(sf);
503 return (KERN_FAILURE);
507 vm_object_reference(object);
508 rv = vm_map_fixed(map, object, offset, start, end - start,
509 prot, VM_PROT_ALL, cow | MAP_CHECK_EXCL);
510 if (rv != KERN_SUCCESS) {
511 locked = VOP_ISLOCKED(imgp->vp);
512 VOP_UNLOCK(imgp->vp, 0);
513 vm_object_deallocate(object);
514 vn_lock(imgp->vp, locked | LK_RETRY);
518 return (KERN_SUCCESS);
522 __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset,
523 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
530 vm_offset_t off, map_addr;
533 vm_ooffset_t file_addr;
536 * It's necessary to fail if the filsz + offset taken from the
537 * header is greater than the actual file pager object's size.
538 * If we were to allow this, then the vm_map_find() below would
539 * walk right off the end of the file object and into the ether.
541 * While I'm here, might as well check for something else that
542 * is invalid: filsz cannot be greater than memsz.
544 if ((filsz != 0 && (off_t)filsz + offset > imgp->attr->va_size) ||
546 uprintf("elf_load_section: truncated ELF file\n");
550 object = imgp->object;
551 map = &imgp->proc->p_vmspace->vm_map;
552 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize);
553 file_addr = trunc_page_ps(offset, pagesize);
556 * We have two choices. We can either clear the data in the last page
557 * of an oversized mapping, or we can start the anon mapping a page
558 * early and copy the initialized data into that first page. We
563 else if (memsz > filsz)
564 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr;
566 map_len = round_page_ps(offset + filsz, pagesize) - file_addr;
569 /* cow flags: don't dump readonly sections in core */
570 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
571 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
573 rv = __elfN(map_insert)(imgp, map,
575 file_addr, /* file offset */
576 map_addr, /* virtual start */
577 map_addr + map_len,/* virtual end */
580 if (rv != KERN_SUCCESS)
583 /* we can stop now if we've covered it all */
590 * We have to get the remaining bit of the file into the first part
591 * of the oversized map segment. This is normally because the .data
592 * segment in the file is extended to provide bss. It's a neat idea
593 * to try and save a page, but it's a pain in the behind to implement.
595 copy_len = filsz == 0 ? 0 : (offset + filsz) - trunc_page_ps(offset +
597 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize);
598 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) -
601 /* This had damn well better be true! */
603 rv = __elfN(map_insert)(imgp, map, NULL, 0, map_addr,
604 map_addr + map_len, prot, 0);
605 if (rv != KERN_SUCCESS)
610 sf = vm_imgact_map_page(object, offset + filsz);
614 /* send the page fragment to user space */
615 off = trunc_page_ps(offset + filsz, pagesize) -
616 trunc_page(offset + filsz);
617 error = copyout((caddr_t)sf_buf_kva(sf) + off,
618 (caddr_t)map_addr, copy_len);
619 vm_imgact_unmap_page(sf);
625 * Remove write access to the page if it was only granted by map_insert
628 if ((prot & VM_PROT_WRITE) == 0)
629 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr +
630 map_len), prot, FALSE);
636 * Load the file "file" into memory. It may be either a shared object
639 * The "addr" reference parameter is in/out. On entry, it specifies
640 * the address where a shared object should be loaded. If the file is
641 * an executable, this value is ignored. On exit, "addr" specifies
642 * where the file was actually loaded.
644 * The "entry" reference parameter is out only. On exit, it specifies
645 * the entry point for the loaded file.
648 __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
649 u_long *entry, size_t pagesize)
654 struct image_params image_params;
656 const Elf_Ehdr *hdr = NULL;
657 const Elf_Phdr *phdr = NULL;
658 struct nameidata *nd;
660 struct image_params *imgp;
663 u_long base_addr = 0;
664 int error, i, numsegs;
666 #ifdef CAPABILITY_MODE
668 * XXXJA: This check can go away once we are sufficiently confident
669 * that the checks in namei() are correct.
671 if (IN_CAPABILITY_MODE(curthread))
675 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
677 attr = &tempdata->attr;
678 imgp = &tempdata->image_params;
681 * Initialize part of the common data
685 imgp->firstpage = NULL;
686 imgp->image_header = NULL;
688 imgp->execlabel = NULL;
690 NDINIT(nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, curthread);
691 if ((error = namei(nd)) != 0) {
695 NDFREE(nd, NDF_ONLY_PNBUF);
696 imgp->vp = nd->ni_vp;
699 * Check permissions, modes, uid, etc on the file, and "open" it.
701 error = exec_check_permissions(imgp);
705 error = exec_map_first_page(imgp);
710 * Also make certain that the interpreter stays the same, so set
711 * its VV_TEXT flag, too.
713 VOP_SET_TEXT(nd->ni_vp);
715 imgp->object = nd->ni_vp->v_object;
717 hdr = (const Elf_Ehdr *)imgp->image_header;
718 if ((error = __elfN(check_header)(hdr)) != 0)
720 if (hdr->e_type == ET_DYN)
722 else if (hdr->e_type == ET_EXEC)
729 /* Only support headers that fit within first page for now */
730 if ((hdr->e_phoff > PAGE_SIZE) ||
731 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
736 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
737 if (!aligned(phdr, Elf_Addr)) {
742 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
743 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) {
744 /* Loadable segment */
745 prot = __elfN(trans_prot)(phdr[i].p_flags);
746 error = __elfN(load_section)(imgp, phdr[i].p_offset,
747 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase,
748 phdr[i].p_memsz, phdr[i].p_filesz, prot, pagesize);
752 * Establish the base address if this is the
756 base_addr = trunc_page(phdr[i].p_vaddr +
762 *entry = (unsigned long)hdr->e_entry + rbase;
766 exec_unmap_first_page(imgp);
771 free(tempdata, M_TEMP);
777 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
781 const Elf_Phdr *phdr;
782 Elf_Auxargs *elf_auxargs;
783 struct vmspace *vmspace;
784 const char *err_str, *newinterp;
785 char *interp, *interp_buf, *path;
786 Elf_Brandinfo *brand_info;
787 struct sysentvec *sv;
789 u_long text_size, data_size, total_size, text_addr, data_addr;
790 u_long seg_size, seg_addr, addr, baddr, et_dyn_addr, entry, proghdr;
792 int error, i, n, interp_name_len, have_interp;
794 hdr = (const Elf_Ehdr *)imgp->image_header;
797 * Do we have a valid ELF header ?
799 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later
800 * if particular brand doesn't support it.
802 if (__elfN(check_header)(hdr) != 0 ||
803 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
807 * From here on down, we return an errno, not -1, as we've
808 * detected an ELF file.
811 if ((hdr->e_phoff > PAGE_SIZE) ||
812 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
813 /* Only support headers in first page for now */
814 uprintf("Program headers not in the first page\n");
817 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
818 if (!aligned(phdr, Elf_Addr)) {
819 uprintf("Unaligned program headers\n");
826 text_size = data_size = total_size = text_addr = data_addr = 0;
829 err_str = newinterp = NULL;
830 interp = interp_buf = NULL;
833 for (i = 0; i < hdr->e_phnum; i++) {
834 switch (phdr[i].p_type) {
837 baddr = phdr[i].p_vaddr;
841 /* Path to interpreter */
842 if (phdr[i].p_filesz > MAXPATHLEN) {
843 uprintf("Invalid PT_INTERP\n");
847 if (interp != NULL) {
848 uprintf("Multiple PT_INTERP headers\n");
852 interp_name_len = phdr[i].p_filesz;
853 if (phdr[i].p_offset > PAGE_SIZE ||
854 interp_name_len > PAGE_SIZE - phdr[i].p_offset) {
855 VOP_UNLOCK(imgp->vp, 0);
856 interp_buf = malloc(interp_name_len + 1, M_TEMP,
858 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
859 error = vn_rdwr(UIO_READ, imgp->vp, interp_buf,
860 interp_name_len, phdr[i].p_offset,
861 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
864 uprintf("i/o error PT_INTERP\n");
867 interp_buf[interp_name_len] = '\0';
870 interp = __DECONST(char *, imgp->image_header) +
877 __elfN(trans_prot)(phdr[i].p_flags);
878 imgp->stack_sz = phdr[i].p_memsz;
883 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len,
885 if (brand_info == NULL) {
886 uprintf("ELF binary type \"%u\" not known.\n",
887 hdr->e_ident[EI_OSABI]);
892 if (hdr->e_type == ET_DYN) {
893 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) {
894 uprintf("Cannot execute shared object\n");
899 * Honour the base load address from the dso if it is
900 * non-zero for some reason.
903 et_dyn_addr = ET_DYN_LOAD_ADDR;
905 sv = brand_info->sysvec;
906 if (interp != NULL && brand_info->interp_newpath != NULL)
907 newinterp = brand_info->interp_newpath;
910 * Avoid a possible deadlock if the current address space is destroyed
911 * and that address space maps the locked vnode. In the common case,
912 * the locked vnode's v_usecount is decremented but remains greater
913 * than zero. Consequently, the vnode lock is not needed by vrele().
914 * However, in cases where the vnode lock is external, such as nullfs,
915 * v_usecount may become zero.
917 * The VV_TEXT flag prevents modifications to the executable while
918 * the vnode is unlocked.
920 VOP_UNLOCK(imgp->vp, 0);
922 error = exec_new_vmspace(imgp, sv);
923 imgp->proc->p_sysent = sv;
925 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
929 for (i = 0; i < hdr->e_phnum; i++) {
930 switch (phdr[i].p_type) {
931 case PT_LOAD: /* Loadable segment */
932 if (phdr[i].p_memsz == 0)
934 prot = __elfN(trans_prot)(phdr[i].p_flags);
935 error = __elfN(load_section)(imgp, phdr[i].p_offset,
936 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr,
937 phdr[i].p_memsz, phdr[i].p_filesz, prot,
943 * If this segment contains the program headers,
944 * remember their virtual address for the AT_PHDR
945 * aux entry. Static binaries don't usually include
948 if (phdr[i].p_offset == 0 &&
949 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize
951 proghdr = phdr[i].p_vaddr + hdr->e_phoff +
954 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
955 seg_size = round_page(phdr[i].p_memsz +
956 phdr[i].p_vaddr + et_dyn_addr - seg_addr);
959 * Make the largest executable segment the official
960 * text segment and all others data.
962 * Note that obreak() assumes that data_addr +
963 * data_size == end of data load area, and the ELF
964 * file format expects segments to be sorted by
965 * address. If multiple data segments exist, the
966 * last one will be used.
969 if (phdr[i].p_flags & PF_X && text_size < seg_size) {
970 text_size = seg_size;
971 text_addr = seg_addr;
973 data_size = seg_size;
974 data_addr = seg_addr;
976 total_size += seg_size;
978 case PT_PHDR: /* Program header table info */
979 proghdr = phdr[i].p_vaddr + et_dyn_addr;
986 if (data_addr == 0 && data_size == 0) {
987 data_addr = text_addr;
988 data_size = text_size;
991 entry = (u_long)hdr->e_entry + et_dyn_addr;
994 * Check limits. It should be safe to check the
995 * limits after loading the segments since we do
996 * not actually fault in all the segments pages.
998 PROC_LOCK(imgp->proc);
999 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA))
1000 err_str = "Data segment size exceeds process limit";
1001 else if (text_size > maxtsiz)
1002 err_str = "Text segment size exceeds system limit";
1003 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM))
1004 err_str = "Total segment size exceeds process limit";
1005 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0)
1006 err_str = "Data segment size exceeds resource limit";
1007 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0)
1008 err_str = "Total segment size exceeds resource limit";
1009 if (err_str != NULL) {
1010 PROC_UNLOCK(imgp->proc);
1011 uprintf("%s\n", err_str);
1016 vmspace = imgp->proc->p_vmspace;
1017 vmspace->vm_tsize = text_size >> PAGE_SHIFT;
1018 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
1019 vmspace->vm_dsize = data_size >> PAGE_SHIFT;
1020 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
1023 * We load the dynamic linker where a userland call
1024 * to mmap(0, ...) would put it. The rationale behind this
1025 * calculation is that it leaves room for the heap to grow to
1026 * its maximum allowed size.
1028 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td,
1030 PROC_UNLOCK(imgp->proc);
1032 imgp->entry_addr = entry;
1034 if (interp != NULL) {
1035 have_interp = FALSE;
1036 VOP_UNLOCK(imgp->vp, 0);
1037 if (brand_info->emul_path != NULL &&
1038 brand_info->emul_path[0] != '\0') {
1039 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1040 snprintf(path, MAXPATHLEN, "%s%s",
1041 brand_info->emul_path, interp);
1042 error = __elfN(load_file)(imgp->proc, path, &addr,
1043 &imgp->entry_addr, sv->sv_pagesize);
1048 if (!have_interp && newinterp != NULL &&
1049 (brand_info->interp_path == NULL ||
1050 strcmp(interp, brand_info->interp_path) == 0)) {
1051 error = __elfN(load_file)(imgp->proc, newinterp, &addr,
1052 &imgp->entry_addr, sv->sv_pagesize);
1057 error = __elfN(load_file)(imgp->proc, interp, &addr,
1058 &imgp->entry_addr, sv->sv_pagesize);
1060 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
1062 uprintf("ELF interpreter %s not found, error %d\n",
1070 * Construct auxargs table (used by the fixup routine)
1072 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
1073 elf_auxargs->execfd = -1;
1074 elf_auxargs->phdr = proghdr;
1075 elf_auxargs->phent = hdr->e_phentsize;
1076 elf_auxargs->phnum = hdr->e_phnum;
1077 elf_auxargs->pagesz = PAGE_SIZE;
1078 elf_auxargs->base = addr;
1079 elf_auxargs->flags = 0;
1080 elf_auxargs->entry = entry;
1081 elf_auxargs->hdr_eflags = hdr->e_flags;
1083 imgp->auxargs = elf_auxargs;
1084 imgp->interpreted = 0;
1085 imgp->reloc_base = addr;
1086 imgp->proc->p_osrel = osrel;
1087 imgp->proc->p_elf_machine = hdr->e_machine;
1088 imgp->proc->p_elf_flags = hdr->e_flags;
1091 free(interp_buf, M_TEMP);
1095 #define suword __CONCAT(suword, __ELF_WORD_SIZE)
1098 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp)
1100 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
1101 Elf_Auxinfo *argarray, *pos;
1102 Elf_Addr *base, *auxbase;
1105 base = (Elf_Addr *)*stack_base;
1106 auxbase = base + imgp->args->argc + 1 + imgp->args->envc + 1;
1107 argarray = pos = malloc(AT_COUNT * sizeof(*pos), M_TEMP,
1110 if (args->execfd != -1)
1111 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
1112 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
1113 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
1114 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
1115 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
1116 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
1117 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
1118 AUXARGS_ENTRY(pos, AT_BASE, args->base);
1119 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags);
1120 if (imgp->execpathp != 0)
1121 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp);
1122 AUXARGS_ENTRY(pos, AT_OSRELDATE,
1123 imgp->proc->p_ucred->cr_prison->pr_osreldate);
1124 if (imgp->canary != 0) {
1125 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary);
1126 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen);
1128 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus);
1129 if (imgp->pagesizes != 0) {
1130 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes);
1131 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen);
1133 if (imgp->sysent->sv_timekeep_base != 0) {
1134 AUXARGS_ENTRY(pos, AT_TIMEKEEP,
1135 imgp->sysent->sv_timekeep_base);
1137 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj
1138 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot :
1139 imgp->sysent->sv_stackprot);
1140 if (imgp->sysent->sv_hwcap != NULL)
1141 AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap);
1142 if (imgp->sysent->sv_hwcap2 != NULL)
1143 AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2);
1144 AUXARGS_ENTRY(pos, AT_NULL, 0);
1146 free(imgp->auxargs, M_TEMP);
1147 imgp->auxargs = NULL;
1148 KASSERT(pos - argarray <= AT_COUNT, ("Too many auxargs"));
1150 error = copyout(argarray, auxbase, sizeof(*argarray) * AT_COUNT);
1151 free(argarray, M_TEMP);
1156 if (suword(base, imgp->args->argc) == -1)
1158 *stack_base = (register_t *)base;
1163 * Code for generating ELF core dumps.
1166 typedef void (*segment_callback)(vm_map_entry_t, void *);
1168 /* Closure for cb_put_phdr(). */
1169 struct phdr_closure {
1170 Elf_Phdr *phdr; /* Program header to fill in */
1171 Elf_Off offset; /* Offset of segment in core file */
1174 /* Closure for cb_size_segment(). */
1175 struct sseg_closure {
1176 int count; /* Count of writable segments. */
1177 size_t size; /* Total size of all writable segments. */
1180 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *);
1183 int type; /* Note type. */
1184 outfunc_t outfunc; /* Output function. */
1185 void *outarg; /* Argument for the output function. */
1186 size_t outsize; /* Output size. */
1187 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */
1190 TAILQ_HEAD(note_info_list, note_info);
1192 /* Coredump output parameters. */
1193 struct coredump_params {
1195 struct ucred *active_cred;
1196 struct ucred *file_cred;
1199 struct compressor *comp;
1202 extern int compress_user_cores;
1203 extern int compress_user_cores_level;
1205 static void cb_put_phdr(vm_map_entry_t, void *);
1206 static void cb_size_segment(vm_map_entry_t, void *);
1207 static int core_write(struct coredump_params *, const void *, size_t, off_t,
1209 static void each_dumpable_segment(struct thread *, segment_callback, void *);
1210 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t,
1211 struct note_info_list *, size_t);
1212 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *,
1214 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t);
1215 static void __elfN(putnote)(struct note_info *, struct sbuf *);
1216 static size_t register_note(struct note_info_list *, int, outfunc_t, void *);
1217 static int sbuf_drain_core_output(void *, const char *, int);
1218 static int sbuf_drain_count(void *arg, const char *data, int len);
1220 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *);
1221 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *);
1222 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *);
1223 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *);
1224 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *);
1225 static void __elfN(note_ptlwpinfo)(void *, struct sbuf *, size_t *);
1226 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *);
1227 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *);
1228 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *);
1229 static void note_procstat_files(void *, struct sbuf *, size_t *);
1230 static void note_procstat_groups(void *, struct sbuf *, size_t *);
1231 static void note_procstat_osrel(void *, struct sbuf *, size_t *);
1232 static void note_procstat_rlimit(void *, struct sbuf *, size_t *);
1233 static void note_procstat_umask(void *, struct sbuf *, size_t *);
1234 static void note_procstat_vmmap(void *, struct sbuf *, size_t *);
1237 * Write out a core segment to the compression stream.
1240 compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len)
1246 chunk_len = MIN(len, CORE_BUF_SIZE);
1249 * We can get EFAULT error here.
1250 * In that case zero out the current chunk of the segment.
1252 error = copyin(base, buf, chunk_len);
1254 bzero(buf, chunk_len);
1255 error = compressor_write(p->comp, buf, chunk_len);
1265 core_compressed_write(void *base, size_t len, off_t offset, void *arg)
1268 return (core_write((struct coredump_params *)arg, base, len, offset,
1273 core_write(struct coredump_params *p, const void *base, size_t len,
1274 off_t offset, enum uio_seg seg)
1277 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, __DECONST(void *, base),
1278 len, offset, seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED,
1279 p->active_cred, p->file_cred, NULL, p->td));
1283 core_output(void *base, size_t len, off_t offset, struct coredump_params *p,
1288 if (p->comp != NULL)
1289 return (compress_chunk(p, base, tmpbuf, len));
1292 * EFAULT is a non-fatal error that we can get, for example,
1293 * if the segment is backed by a file but extends beyond its
1296 error = core_write(p, base, len, offset, UIO_USERSPACE);
1297 if (error == EFAULT) {
1298 log(LOG_WARNING, "Failed to fully fault in a core file segment "
1299 "at VA %p with size 0x%zx to be written at offset 0x%jx "
1300 "for process %s\n", base, len, offset, curproc->p_comm);
1303 * Write a "real" zero byte at the end of the target region
1304 * in the case this is the last segment.
1305 * The intermediate space will be implicitly zero-filled.
1307 error = core_write(p, zero_region, 1, offset + len - 1,
1314 * Drain into a core file.
1317 sbuf_drain_core_output(void *arg, const char *data, int len)
1319 struct coredump_params *p;
1322 p = (struct coredump_params *)arg;
1325 * Some kern_proc out routines that print to this sbuf may
1326 * call us with the process lock held. Draining with the
1327 * non-sleepable lock held is unsafe. The lock is needed for
1328 * those routines when dumping a live process. In our case we
1329 * can safely release the lock before draining and acquire
1332 locked = PROC_LOCKED(p->td->td_proc);
1334 PROC_UNLOCK(p->td->td_proc);
1335 if (p->comp != NULL)
1336 error = compressor_write(p->comp, __DECONST(char *, data), len);
1338 error = core_write(p, __DECONST(void *, data), len, p->offset,
1341 PROC_LOCK(p->td->td_proc);
1349 * Drain into a counter.
1352 sbuf_drain_count(void *arg, const char *data __unused, int len)
1356 sizep = (size_t *)arg;
1362 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags)
1364 struct ucred *cred = td->td_ucred;
1366 struct sseg_closure seginfo;
1367 struct note_info_list notelst;
1368 struct coredump_params params;
1369 struct note_info *ninfo;
1371 size_t hdrsize, notesz, coresize;
1375 TAILQ_INIT(¬elst);
1377 /* Size the program segments. */
1380 each_dumpable_segment(td, cb_size_segment, &seginfo);
1383 * Collect info about the core file header area.
1385 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count);
1386 if (seginfo.count + 1 >= PN_XNUM)
1387 hdrsize += sizeof(Elf_Shdr);
1388 __elfN(prepare_notes)(td, ¬elst, ¬esz);
1389 coresize = round_page(hdrsize + notesz) + seginfo.size;
1391 /* Set up core dump parameters. */
1393 params.active_cred = cred;
1394 params.file_cred = NOCRED;
1401 PROC_LOCK(td->td_proc);
1402 error = racct_add(td->td_proc, RACCT_CORE, coresize);
1403 PROC_UNLOCK(td->td_proc);
1410 if (coresize >= limit) {
1415 /* Create a compression stream if necessary. */
1416 if (compress_user_cores != 0) {
1417 params.comp = compressor_init(core_compressed_write,
1418 compress_user_cores, CORE_BUF_SIZE,
1419 compress_user_cores_level, ¶ms);
1420 if (params.comp == NULL) {
1424 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO);
1428 * Allocate memory for building the header, fill it up,
1429 * and write it out following the notes.
1431 hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
1432 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst,
1435 /* Write the contents of all of the writable segments. */
1441 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
1442 offset = round_page(hdrsize + notesz);
1443 for (i = 0; i < seginfo.count; i++) {
1444 error = core_output((caddr_t)(uintptr_t)php->p_vaddr,
1445 php->p_filesz, offset, ¶ms, tmpbuf);
1448 offset += php->p_filesz;
1451 if (error == 0 && params.comp != NULL)
1452 error = compressor_flush(params.comp);
1456 "Failed to write core file for process %s (error %d)\n",
1457 curproc->p_comm, error);
1461 free(tmpbuf, M_TEMP);
1462 if (params.comp != NULL)
1463 compressor_fini(params.comp);
1464 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) {
1465 TAILQ_REMOVE(¬elst, ninfo, link);
1466 free(ninfo, M_TEMP);
1475 * A callback for each_dumpable_segment() to write out the segment's
1476 * program header entry.
1479 cb_put_phdr(vm_map_entry_t entry, void *closure)
1481 struct phdr_closure *phc = (struct phdr_closure *)closure;
1482 Elf_Phdr *phdr = phc->phdr;
1484 phc->offset = round_page(phc->offset);
1486 phdr->p_type = PT_LOAD;
1487 phdr->p_offset = phc->offset;
1488 phdr->p_vaddr = entry->start;
1490 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1491 phdr->p_align = PAGE_SIZE;
1492 phdr->p_flags = __elfN(untrans_prot)(entry->protection);
1494 phc->offset += phdr->p_filesz;
1499 * A callback for each_dumpable_segment() to gather information about
1500 * the number of segments and their total size.
1503 cb_size_segment(vm_map_entry_t entry, void *closure)
1505 struct sseg_closure *ssc = (struct sseg_closure *)closure;
1508 ssc->size += entry->end - entry->start;
1512 * For each writable segment in the process's memory map, call the given
1513 * function with a pointer to the map entry and some arbitrary
1514 * caller-supplied data.
1517 each_dumpable_segment(struct thread *td, segment_callback func, void *closure)
1519 struct proc *p = td->td_proc;
1520 vm_map_t map = &p->p_vmspace->vm_map;
1521 vm_map_entry_t entry;
1522 vm_object_t backing_object, object;
1523 boolean_t ignore_entry;
1525 vm_map_lock_read(map);
1526 for (entry = map->header.next; entry != &map->header;
1527 entry = entry->next) {
1529 * Don't dump inaccessible mappings, deal with legacy
1532 * Note that read-only segments related to the elf binary
1533 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1534 * need to arbitrarily ignore such segments.
1536 if (elf_legacy_coredump) {
1537 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW)
1540 if ((entry->protection & VM_PROT_ALL) == 0)
1545 * Dont include memory segment in the coredump if
1546 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1547 * madvise(2). Do not dump submaps (i.e. parts of the
1550 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP))
1553 if ((object = entry->object.vm_object) == NULL)
1556 /* Ignore memory-mapped devices and such things. */
1557 VM_OBJECT_RLOCK(object);
1558 while ((backing_object = object->backing_object) != NULL) {
1559 VM_OBJECT_RLOCK(backing_object);
1560 VM_OBJECT_RUNLOCK(object);
1561 object = backing_object;
1563 ignore_entry = object->type != OBJT_DEFAULT &&
1564 object->type != OBJT_SWAP && object->type != OBJT_VNODE &&
1565 object->type != OBJT_PHYS;
1566 VM_OBJECT_RUNLOCK(object);
1570 (*func)(entry, closure);
1572 vm_map_unlock_read(map);
1576 * Write the core file header to the file, including padding up to
1577 * the page boundary.
1580 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr,
1581 size_t hdrsize, struct note_info_list *notelst, size_t notesz)
1583 struct note_info *ninfo;
1587 /* Fill in the header. */
1588 bzero(hdr, hdrsize);
1589 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz);
1591 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN);
1592 sbuf_set_drain(sb, sbuf_drain_core_output, p);
1593 sbuf_start_section(sb, NULL);
1594 sbuf_bcat(sb, hdr, hdrsize);
1595 TAILQ_FOREACH(ninfo, notelst, link)
1596 __elfN(putnote)(ninfo, sb);
1597 /* Align up to a page boundary for the program segments. */
1598 sbuf_end_section(sb, -1, PAGE_SIZE, 0);
1599 error = sbuf_finish(sb);
1606 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list,
1616 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p);
1619 * To have the debugger select the right thread (LWP) as the initial
1620 * thread, we dump the state of the thread passed to us in td first.
1621 * This is the thread that causes the core dump and thus likely to
1622 * be the right thread one wants to have selected in the debugger.
1625 while (thr != NULL) {
1626 size += register_note(list, NT_PRSTATUS,
1627 __elfN(note_prstatus), thr);
1628 size += register_note(list, NT_FPREGSET,
1629 __elfN(note_fpregset), thr);
1630 size += register_note(list, NT_THRMISC,
1631 __elfN(note_thrmisc), thr);
1632 size += register_note(list, NT_PTLWPINFO,
1633 __elfN(note_ptlwpinfo), thr);
1634 size += register_note(list, -1,
1635 __elfN(note_threadmd), thr);
1637 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) :
1638 TAILQ_NEXT(thr, td_plist);
1640 thr = TAILQ_NEXT(thr, td_plist);
1643 size += register_note(list, NT_PROCSTAT_PROC,
1644 __elfN(note_procstat_proc), p);
1645 size += register_note(list, NT_PROCSTAT_FILES,
1646 note_procstat_files, p);
1647 size += register_note(list, NT_PROCSTAT_VMMAP,
1648 note_procstat_vmmap, p);
1649 size += register_note(list, NT_PROCSTAT_GROUPS,
1650 note_procstat_groups, p);
1651 size += register_note(list, NT_PROCSTAT_UMASK,
1652 note_procstat_umask, p);
1653 size += register_note(list, NT_PROCSTAT_RLIMIT,
1654 note_procstat_rlimit, p);
1655 size += register_note(list, NT_PROCSTAT_OSREL,
1656 note_procstat_osrel, p);
1657 size += register_note(list, NT_PROCSTAT_PSSTRINGS,
1658 __elfN(note_procstat_psstrings), p);
1659 size += register_note(list, NT_PROCSTAT_AUXV,
1660 __elfN(note_procstat_auxv), p);
1666 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs,
1672 struct phdr_closure phc;
1674 ehdr = (Elf_Ehdr *)hdr;
1676 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1677 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1678 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1679 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1680 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1681 ehdr->e_ident[EI_DATA] = ELF_DATA;
1682 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1683 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
1684 ehdr->e_ident[EI_ABIVERSION] = 0;
1685 ehdr->e_ident[EI_PAD] = 0;
1686 ehdr->e_type = ET_CORE;
1687 ehdr->e_machine = td->td_proc->p_elf_machine;
1688 ehdr->e_version = EV_CURRENT;
1690 ehdr->e_phoff = sizeof(Elf_Ehdr);
1691 ehdr->e_flags = td->td_proc->p_elf_flags;
1692 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1693 ehdr->e_phentsize = sizeof(Elf_Phdr);
1694 ehdr->e_shentsize = sizeof(Elf_Shdr);
1695 ehdr->e_shstrndx = SHN_UNDEF;
1696 if (numsegs + 1 < PN_XNUM) {
1697 ehdr->e_phnum = numsegs + 1;
1700 ehdr->e_phnum = PN_XNUM;
1703 ehdr->e_shoff = ehdr->e_phoff +
1704 (numsegs + 1) * ehdr->e_phentsize;
1705 KASSERT(ehdr->e_shoff == hdrsize - sizeof(Elf_Shdr),
1706 ("e_shoff: %zu, hdrsize - shdr: %zu",
1707 (size_t)ehdr->e_shoff, hdrsize - sizeof(Elf_Shdr)));
1709 shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff);
1710 memset(shdr, 0, sizeof(*shdr));
1712 * A special first section is used to hold large segment and
1713 * section counts. This was proposed by Sun Microsystems in
1714 * Solaris and has been adopted by Linux; the standard ELF
1715 * tools are already familiar with the technique.
1717 * See table 7-7 of the Solaris "Linker and Libraries Guide"
1718 * (or 12-7 depending on the version of the document) for more
1721 shdr->sh_type = SHT_NULL;
1722 shdr->sh_size = ehdr->e_shnum;
1723 shdr->sh_link = ehdr->e_shstrndx;
1724 shdr->sh_info = numsegs + 1;
1728 * Fill in the program header entries.
1730 phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff);
1732 /* The note segement. */
1733 phdr->p_type = PT_NOTE;
1734 phdr->p_offset = hdrsize;
1737 phdr->p_filesz = notesz;
1739 phdr->p_flags = PF_R;
1740 phdr->p_align = ELF_NOTE_ROUNDSIZE;
1743 /* All the writable segments from the program. */
1745 phc.offset = round_page(hdrsize + notesz);
1746 each_dumpable_segment(td, cb_put_phdr, &phc);
1750 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg)
1752 struct note_info *ninfo;
1753 size_t size, notesize;
1756 out(arg, NULL, &size);
1757 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK);
1759 ninfo->outfunc = out;
1760 ninfo->outarg = arg;
1761 ninfo->outsize = size;
1762 TAILQ_INSERT_TAIL(list, ninfo, link);
1767 notesize = sizeof(Elf_Note) + /* note header */
1768 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
1770 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
1776 append_note_data(const void *src, void *dst, size_t len)
1780 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE);
1782 bcopy(src, dst, len);
1783 bzero((char *)dst + len, padded_len - len);
1785 return (padded_len);
1789 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp)
1797 note = (Elf_Note *)buf;
1798 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR);
1799 note->n_descsz = size;
1800 note->n_type = type;
1801 buf += sizeof(*note);
1802 buf += append_note_data(FREEBSD_ABI_VENDOR, buf,
1803 sizeof(FREEBSD_ABI_VENDOR));
1804 append_note_data(src, buf, size);
1809 notesize = sizeof(Elf_Note) + /* note header */
1810 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
1812 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
1818 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb)
1821 ssize_t old_len, sect_len;
1822 size_t new_len, descsz, i;
1824 if (ninfo->type == -1) {
1825 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
1829 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR);
1830 note.n_descsz = ninfo->outsize;
1831 note.n_type = ninfo->type;
1833 sbuf_bcat(sb, ¬e, sizeof(note));
1834 sbuf_start_section(sb, &old_len);
1835 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR));
1836 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
1837 if (note.n_descsz == 0)
1839 sbuf_start_section(sb, &old_len);
1840 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
1841 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
1845 new_len = (size_t)sect_len;
1846 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE);
1847 if (new_len < descsz) {
1849 * It is expected that individual note emitters will correctly
1850 * predict their expected output size and fill up to that size
1851 * themselves, padding in a format-specific way if needed.
1852 * However, in case they don't, just do it here with zeros.
1854 for (i = 0; i < descsz - new_len; i++)
1856 } else if (new_len > descsz) {
1858 * We can't always truncate sb -- we may have drained some
1861 KASSERT(new_len == descsz, ("%s: Note type %u changed as we "
1862 "read it (%zu > %zu). Since it is longer than "
1863 "expected, this coredump's notes are corrupt. THIS "
1864 "IS A BUG in the note_procstat routine for type %u.\n",
1865 __func__, (unsigned)note.n_type, new_len, descsz,
1866 (unsigned)note.n_type));
1871 * Miscellaneous note out functions.
1874 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1875 #include <compat/freebsd32/freebsd32.h>
1876 #include <compat/freebsd32/freebsd32_signal.h>
1878 typedef struct prstatus32 elf_prstatus_t;
1879 typedef struct prpsinfo32 elf_prpsinfo_t;
1880 typedef struct fpreg32 elf_prfpregset_t;
1881 typedef struct fpreg32 elf_fpregset_t;
1882 typedef struct reg32 elf_gregset_t;
1883 typedef struct thrmisc32 elf_thrmisc_t;
1884 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32
1885 typedef struct kinfo_proc32 elf_kinfo_proc_t;
1886 typedef uint32_t elf_ps_strings_t;
1888 typedef prstatus_t elf_prstatus_t;
1889 typedef prpsinfo_t elf_prpsinfo_t;
1890 typedef prfpregset_t elf_prfpregset_t;
1891 typedef prfpregset_t elf_fpregset_t;
1892 typedef gregset_t elf_gregset_t;
1893 typedef thrmisc_t elf_thrmisc_t;
1894 #define ELF_KERN_PROC_MASK 0
1895 typedef struct kinfo_proc elf_kinfo_proc_t;
1896 typedef vm_offset_t elf_ps_strings_t;
1900 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep)
1906 elf_prpsinfo_t *psinfo;
1909 p = (struct proc *)arg;
1911 KASSERT(*sizep == sizeof(*psinfo), ("invalid size"));
1912 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK);
1913 psinfo->pr_version = PRPSINFO_VERSION;
1914 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t);
1915 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
1917 if (p->p_args != NULL) {
1918 len = sizeof(psinfo->pr_psargs) - 1;
1919 if (len > p->p_args->ar_length)
1920 len = p->p_args->ar_length;
1921 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len);
1927 sbuf_new(&sbarg, psinfo->pr_psargs,
1928 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN);
1929 error = proc_getargv(curthread, p, &sbarg);
1931 if (sbuf_finish(&sbarg) == 0)
1932 len = sbuf_len(&sbarg) - 1;
1934 len = sizeof(psinfo->pr_psargs) - 1;
1935 sbuf_delete(&sbarg);
1937 if (error || len == 0)
1938 strlcpy(psinfo->pr_psargs, p->p_comm,
1939 sizeof(psinfo->pr_psargs));
1941 KASSERT(len < sizeof(psinfo->pr_psargs),
1942 ("len is too long: %zu vs %zu", len,
1943 sizeof(psinfo->pr_psargs)));
1944 cp = psinfo->pr_psargs;
1947 cp = memchr(cp, '\0', end - cp);
1953 psinfo->pr_pid = p->p_pid;
1954 sbuf_bcat(sb, psinfo, sizeof(*psinfo));
1955 free(psinfo, M_TEMP);
1957 *sizep = sizeof(*psinfo);
1961 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep)
1964 elf_prstatus_t *status;
1966 td = (struct thread *)arg;
1968 KASSERT(*sizep == sizeof(*status), ("invalid size"));
1969 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK);
1970 status->pr_version = PRSTATUS_VERSION;
1971 status->pr_statussz = sizeof(elf_prstatus_t);
1972 status->pr_gregsetsz = sizeof(elf_gregset_t);
1973 status->pr_fpregsetsz = sizeof(elf_fpregset_t);
1974 status->pr_osreldate = osreldate;
1975 status->pr_cursig = td->td_proc->p_sig;
1976 status->pr_pid = td->td_tid;
1977 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1978 fill_regs32(td, &status->pr_reg);
1980 fill_regs(td, &status->pr_reg);
1982 sbuf_bcat(sb, status, sizeof(*status));
1983 free(status, M_TEMP);
1985 *sizep = sizeof(*status);
1989 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep)
1992 elf_prfpregset_t *fpregset;
1994 td = (struct thread *)arg;
1996 KASSERT(*sizep == sizeof(*fpregset), ("invalid size"));
1997 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK);
1998 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1999 fill_fpregs32(td, fpregset);
2001 fill_fpregs(td, fpregset);
2003 sbuf_bcat(sb, fpregset, sizeof(*fpregset));
2004 free(fpregset, M_TEMP);
2006 *sizep = sizeof(*fpregset);
2010 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep)
2013 elf_thrmisc_t thrmisc;
2015 td = (struct thread *)arg;
2017 KASSERT(*sizep == sizeof(thrmisc), ("invalid size"));
2018 bzero(&thrmisc._pad, sizeof(thrmisc._pad));
2019 strcpy(thrmisc.pr_tname, td->td_name);
2020 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc));
2022 *sizep = sizeof(thrmisc);
2026 __elfN(note_ptlwpinfo)(void *arg, struct sbuf *sb, size_t *sizep)
2031 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2032 struct ptrace_lwpinfo32 pl;
2034 struct ptrace_lwpinfo pl;
2037 td = (struct thread *)arg;
2038 size = sizeof(structsize) + sizeof(pl);
2040 KASSERT(*sizep == size, ("invalid size"));
2041 structsize = sizeof(pl);
2042 sbuf_bcat(sb, &structsize, sizeof(structsize));
2043 bzero(&pl, sizeof(pl));
2044 pl.pl_lwpid = td->td_tid;
2045 pl.pl_event = PL_EVENT_NONE;
2046 pl.pl_sigmask = td->td_sigmask;
2047 pl.pl_siglist = td->td_siglist;
2048 if (td->td_si.si_signo != 0) {
2049 pl.pl_event = PL_EVENT_SIGNAL;
2050 pl.pl_flags |= PL_FLAG_SI;
2051 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2052 siginfo_to_siginfo32(&td->td_si, &pl.pl_siginfo);
2054 pl.pl_siginfo = td->td_si;
2057 strcpy(pl.pl_tdname, td->td_name);
2058 /* XXX TODO: supply more information in struct ptrace_lwpinfo*/
2059 sbuf_bcat(sb, &pl, sizeof(pl));
2065 * Allow for MD specific notes, as well as any MD
2066 * specific preparations for writing MI notes.
2069 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep)
2075 td = (struct thread *)arg;
2077 if (size != 0 && sb != NULL)
2078 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK);
2082 __elfN(dump_thread)(td, buf, &size);
2083 KASSERT(sb == NULL || *sizep == size, ("invalid size"));
2084 if (size != 0 && sb != NULL)
2085 sbuf_bcat(sb, buf, size);
2090 #ifdef KINFO_PROC_SIZE
2091 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
2095 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep)
2101 p = (struct proc *)arg;
2102 size = sizeof(structsize) + p->p_numthreads *
2103 sizeof(elf_kinfo_proc_t);
2106 KASSERT(*sizep == size, ("invalid size"));
2107 structsize = sizeof(elf_kinfo_proc_t);
2108 sbuf_bcat(sb, &structsize, sizeof(structsize));
2109 sx_slock(&proctree_lock);
2111 kern_proc_out(p, sb, ELF_KERN_PROC_MASK);
2112 sx_sunlock(&proctree_lock);
2117 #ifdef KINFO_FILE_SIZE
2118 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE);
2122 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep)
2125 size_t size, sect_sz, i;
2126 ssize_t start_len, sect_len;
2127 int structsize, filedesc_flags;
2129 if (coredump_pack_fileinfo)
2130 filedesc_flags = KERN_FILEDESC_PACK_KINFO;
2134 p = (struct proc *)arg;
2135 structsize = sizeof(struct kinfo_file);
2138 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2139 sbuf_set_drain(sb, sbuf_drain_count, &size);
2140 sbuf_bcat(sb, &structsize, sizeof(structsize));
2142 kern_proc_filedesc_out(p, sb, -1, filedesc_flags);
2147 sbuf_start_section(sb, &start_len);
2149 sbuf_bcat(sb, &structsize, sizeof(structsize));
2151 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize),
2154 sect_len = sbuf_end_section(sb, start_len, 0, 0);
2159 KASSERT(sect_sz <= *sizep,
2160 ("kern_proc_filedesc_out did not respect maxlen; "
2161 "requested %zu, got %zu", *sizep - sizeof(structsize),
2162 sect_sz - sizeof(structsize)));
2164 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++)
2169 #ifdef KINFO_VMENTRY_SIZE
2170 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE);
2174 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep)
2178 int structsize, vmmap_flags;
2180 if (coredump_pack_vmmapinfo)
2181 vmmap_flags = KERN_VMMAP_PACK_KINFO;
2185 p = (struct proc *)arg;
2186 structsize = sizeof(struct kinfo_vmentry);
2189 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2190 sbuf_set_drain(sb, sbuf_drain_count, &size);
2191 sbuf_bcat(sb, &structsize, sizeof(structsize));
2193 kern_proc_vmmap_out(p, sb, -1, vmmap_flags);
2198 sbuf_bcat(sb, &structsize, sizeof(structsize));
2200 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize),
2206 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep)
2212 p = (struct proc *)arg;
2213 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t);
2215 KASSERT(*sizep == size, ("invalid size"));
2216 structsize = sizeof(gid_t);
2217 sbuf_bcat(sb, &structsize, sizeof(structsize));
2218 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups *
2225 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep)
2231 p = (struct proc *)arg;
2232 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask);
2234 KASSERT(*sizep == size, ("invalid size"));
2235 structsize = sizeof(p->p_fd->fd_cmask);
2236 sbuf_bcat(sb, &structsize, sizeof(structsize));
2237 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask));
2243 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep)
2246 struct rlimit rlim[RLIM_NLIMITS];
2250 p = (struct proc *)arg;
2251 size = sizeof(structsize) + sizeof(rlim);
2253 KASSERT(*sizep == size, ("invalid size"));
2254 structsize = sizeof(rlim);
2255 sbuf_bcat(sb, &structsize, sizeof(structsize));
2257 for (i = 0; i < RLIM_NLIMITS; i++)
2258 lim_rlimit_proc(p, i, &rlim[i]);
2260 sbuf_bcat(sb, rlim, sizeof(rlim));
2266 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep)
2272 p = (struct proc *)arg;
2273 size = sizeof(structsize) + sizeof(p->p_osrel);
2275 KASSERT(*sizep == size, ("invalid size"));
2276 structsize = sizeof(p->p_osrel);
2277 sbuf_bcat(sb, &structsize, sizeof(structsize));
2278 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel));
2284 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep)
2287 elf_ps_strings_t ps_strings;
2291 p = (struct proc *)arg;
2292 size = sizeof(structsize) + sizeof(ps_strings);
2294 KASSERT(*sizep == size, ("invalid size"));
2295 structsize = sizeof(ps_strings);
2296 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2297 ps_strings = PTROUT(p->p_sysent->sv_psstrings);
2299 ps_strings = p->p_sysent->sv_psstrings;
2301 sbuf_bcat(sb, &structsize, sizeof(structsize));
2302 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings));
2308 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep)
2314 p = (struct proc *)arg;
2317 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2318 sbuf_set_drain(sb, sbuf_drain_count, &size);
2319 sbuf_bcat(sb, &structsize, sizeof(structsize));
2321 proc_getauxv(curthread, p, sb);
2327 structsize = sizeof(Elf_Auxinfo);
2328 sbuf_bcat(sb, &structsize, sizeof(structsize));
2330 proc_getauxv(curthread, p, sb);
2336 __elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote,
2337 int32_t *osrel, const Elf_Phdr *pnote)
2339 const Elf_Note *note, *note0, *note_end;
2340 const char *note_name;
2345 /* We need some limit, might as well use PAGE_SIZE. */
2346 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE)
2348 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes");
2349 if (pnote->p_offset > PAGE_SIZE ||
2350 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) {
2351 VOP_UNLOCK(imgp->vp, 0);
2352 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK);
2353 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
2354 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz,
2355 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED,
2356 curthread->td_ucred, NOCRED, NULL, curthread);
2358 uprintf("i/o error PT_NOTE\n");
2362 note = note0 = (const Elf_Note *)buf;
2363 note_end = (const Elf_Note *)(buf + pnote->p_filesz);
2365 note = note0 = (const Elf_Note *)(imgp->image_header +
2367 note_end = (const Elf_Note *)(imgp->image_header +
2368 pnote->p_offset + pnote->p_filesz);
2371 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) {
2372 if (!aligned(note, Elf32_Addr) || (const char *)note_end -
2373 (const char *)note < sizeof(Elf_Note)) {
2377 if (note->n_namesz != checknote->hdr.n_namesz ||
2378 note->n_descsz != checknote->hdr.n_descsz ||
2379 note->n_type != checknote->hdr.n_type)
2381 note_name = (const char *)(note + 1);
2382 if (note_name + checknote->hdr.n_namesz >=
2383 (const char *)note_end || strncmp(checknote->vendor,
2384 note_name, checknote->hdr.n_namesz) != 0)
2388 * Fetch the osreldate for binary
2389 * from the ELF OSABI-note if necessary.
2391 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 &&
2392 checknote->trans_osrel != NULL) {
2393 res = checknote->trans_osrel(note, osrel);
2399 note = (const Elf_Note *)((const char *)(note + 1) +
2400 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) +
2401 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE));
2410 * Try to find the appropriate ABI-note section for checknote,
2411 * fetch the osreldate for binary from the ELF OSABI-note. Only the
2412 * first page of the image is searched, the same as for headers.
2415 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote,
2418 const Elf_Phdr *phdr;
2419 const Elf_Ehdr *hdr;
2422 hdr = (const Elf_Ehdr *)imgp->image_header;
2423 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
2425 for (i = 0; i < hdr->e_phnum; i++) {
2426 if (phdr[i].p_type == PT_NOTE &&
2427 __elfN(parse_notes)(imgp, checknote, osrel, &phdr[i]))
2435 * Tell kern_execve.c about it, with a little help from the linker.
2437 static struct execsw __elfN(execsw) = {
2438 .ex_imgact = __CONCAT(exec_, __elfN(imgact)),
2439 .ex_name = __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
2441 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
2444 __elfN(trans_prot)(Elf_Word flags)
2450 prot |= VM_PROT_EXECUTE;
2452 prot |= VM_PROT_WRITE;
2454 prot |= VM_PROT_READ;
2455 #if __ELF_WORD_SIZE == 32
2456 #if defined(__amd64__)
2457 if (i386_read_exec && (flags & PF_R))
2458 prot |= VM_PROT_EXECUTE;
2465 __elfN(untrans_prot)(vm_prot_t prot)
2470 if (prot & VM_PROT_EXECUTE)
2472 if (prot & VM_PROT_READ)
2474 if (prot & VM_PROT_WRITE)