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"
38 #include "opt_compat.h"
40 #include <sys/param.h>
41 #include <sys/capsicum.h>
42 #include <sys/compressor.h>
44 #include <sys/fcntl.h>
45 #include <sys/imgact.h>
46 #include <sys/imgact_elf.h>
48 #include <sys/kernel.h>
50 #include <sys/malloc.h>
51 #include <sys/mount.h>
53 #include <sys/namei.h>
54 #include <sys/pioctl.h>
56 #include <sys/procfs.h>
57 #include <sys/ptrace.h>
58 #include <sys/racct.h>
59 #include <sys/resourcevar.h>
60 #include <sys/rwlock.h>
62 #include <sys/sf_buf.h>
64 #include <sys/systm.h>
65 #include <sys/signalvar.h>
68 #include <sys/syscall.h>
69 #include <sys/sysctl.h>
70 #include <sys/sysent.h>
71 #include <sys/vnode.h>
72 #include <sys/syslog.h>
73 #include <sys/eventhandler.h>
77 #include <vm/vm_kern.h>
78 #include <vm/vm_param.h>
80 #include <vm/vm_map.h>
81 #include <vm/vm_object.h>
82 #include <vm/vm_extern.h>
84 #include <machine/elf.h>
85 #include <machine/md_var.h>
87 #define ELF_NOTE_ROUNDSIZE 4
88 #define OLD_EI_BRAND 8
90 static int __elfN(check_header)(const Elf_Ehdr *hdr);
91 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp,
92 const char *interp, int interp_name_len, int32_t *osrel);
93 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
94 u_long *entry, size_t pagesize);
95 static int __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset,
96 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
98 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp);
99 static boolean_t __elfN(freebsd_trans_osrel)(const Elf_Note *note,
101 static boolean_t kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel);
102 static boolean_t __elfN(check_note)(struct image_params *imgp,
103 Elf_Brandnote *checknote, int32_t *osrel);
104 static vm_prot_t __elfN(trans_prot)(Elf_Word);
105 static Elf_Word __elfN(untrans_prot)(vm_prot_t);
107 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0,
110 #define CORE_BUF_SIZE (16 * 1024)
112 int __elfN(fallback_brand) = -1;
113 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
114 fallback_brand, CTLFLAG_RWTUN, &__elfN(fallback_brand), 0,
115 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort");
117 static int elf_legacy_coredump = 0;
118 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW,
119 &elf_legacy_coredump, 0,
120 "include all and only RW pages in core dumps");
122 int __elfN(nxstack) =
123 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */ || \
124 (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__)
129 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
130 nxstack, CTLFLAG_RW, &__elfN(nxstack), 0,
131 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack");
133 #if __ELF_WORD_SIZE == 32
134 #if defined(__amd64__)
135 int i386_read_exec = 0;
136 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0,
137 "enable execution from readable segments");
141 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS];
143 #define trunc_page_ps(va, ps) rounddown2(va, ps)
144 #define round_page_ps(va, ps) roundup2(va, ps)
145 #define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a))
147 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD";
149 Elf_Brandnote __elfN(freebsd_brandnote) = {
150 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR),
151 .hdr.n_descsz = sizeof(int32_t),
152 .hdr.n_type = NT_FREEBSD_ABI_TAG,
153 .vendor = FREEBSD_ABI_VENDOR,
154 .flags = BN_TRANSLATE_OSREL,
155 .trans_osrel = __elfN(freebsd_trans_osrel)
159 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel)
163 p = (uintptr_t)(note + 1);
164 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
165 *osrel = *(const int32_t *)(p);
170 static const char GNU_ABI_VENDOR[] = "GNU";
171 static int GNU_KFREEBSD_ABI_DESC = 3;
173 Elf_Brandnote __elfN(kfreebsd_brandnote) = {
174 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
175 .hdr.n_descsz = 16, /* XXX at least 16 */
177 .vendor = GNU_ABI_VENDOR,
178 .flags = BN_TRANSLATE_OSREL,
179 .trans_osrel = kfreebsd_trans_osrel
183 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel)
185 const Elf32_Word *desc;
188 p = (uintptr_t)(note + 1);
189 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
191 desc = (const Elf32_Word *)p;
192 if (desc[0] != GNU_KFREEBSD_ABI_DESC)
196 * Debian GNU/kFreeBSD embed the earliest compatible kernel version
197 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way.
199 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3];
205 __elfN(insert_brand_entry)(Elf_Brandinfo *entry)
209 for (i = 0; i < MAX_BRANDS; i++) {
210 if (elf_brand_list[i] == NULL) {
211 elf_brand_list[i] = entry;
215 if (i == MAX_BRANDS) {
216 printf("WARNING: %s: could not insert brandinfo entry: %p\n",
224 __elfN(remove_brand_entry)(Elf_Brandinfo *entry)
228 for (i = 0; i < MAX_BRANDS; i++) {
229 if (elf_brand_list[i] == entry) {
230 elf_brand_list[i] = NULL;
240 __elfN(brand_inuse)(Elf_Brandinfo *entry)
245 sx_slock(&allproc_lock);
246 FOREACH_PROC_IN_SYSTEM(p) {
247 if (p->p_sysent == entry->sysvec) {
252 sx_sunlock(&allproc_lock);
257 static Elf_Brandinfo *
258 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
259 int interp_name_len, int32_t *osrel)
261 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
262 Elf_Brandinfo *bi, *bi_m;
267 * We support four types of branding -- (1) the ELF EI_OSABI field
268 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
269 * branding w/in the ELF header, (3) path of the `interp_path'
270 * field, and (4) the ".note.ABI-tag" ELF section.
273 /* Look for an ".note.ABI-tag" ELF section */
275 for (i = 0; i < MAX_BRANDS; i++) {
276 bi = elf_brand_list[i];
279 if (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)
281 if (hdr->e_machine == bi->machine && (bi->flags &
282 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
283 ret = __elfN(check_note)(imgp, bi->brand_note, osrel);
284 /* Give brand a chance to veto check_note's guess */
285 if (ret && bi->header_supported)
286 ret = bi->header_supported(imgp);
288 * If note checker claimed the binary, but the
289 * interpreter path in the image does not
290 * match default one for the brand, try to
291 * search for other brands with the same
292 * interpreter. Either there is better brand
293 * with the right interpreter, or, failing
294 * this, we return first brand which accepted
295 * our note and, optionally, header.
297 if (ret && bi_m == NULL && interp != NULL &&
298 (bi->interp_path == NULL ||
299 (strlen(bi->interp_path) + 1 != interp_name_len ||
300 strncmp(interp, bi->interp_path, interp_name_len)
312 /* If the executable has a brand, search for it in the brand list. */
313 for (i = 0; i < MAX_BRANDS; i++) {
314 bi = elf_brand_list[i];
315 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 ||
316 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0))
318 if (hdr->e_machine == bi->machine &&
319 (hdr->e_ident[EI_OSABI] == bi->brand ||
320 (bi->compat_3_brand != NULL &&
321 strcmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
322 bi->compat_3_brand) == 0))) {
323 /* Looks good, but give brand a chance to veto */
324 if (!bi->header_supported ||
325 bi->header_supported(imgp)) {
327 * Again, prefer strictly matching
330 if (interp_name_len == 0 &&
331 bi->interp_path == NULL)
333 if (bi->interp_path != NULL &&
334 strlen(bi->interp_path) + 1 ==
335 interp_name_len && strncmp(interp,
336 bi->interp_path, interp_name_len) == 0)
346 /* No known brand, see if the header is recognized by any brand */
347 for (i = 0; i < MAX_BRANDS; i++) {
348 bi = elf_brand_list[i];
349 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY ||
350 bi->header_supported == NULL)
352 if (hdr->e_machine == bi->machine) {
353 ret = bi->header_supported(imgp);
359 /* Lacking a known brand, search for a recognized interpreter. */
360 if (interp != NULL) {
361 for (i = 0; i < MAX_BRANDS; i++) {
362 bi = elf_brand_list[i];
363 if (bi == NULL || (bi->flags &
364 (BI_BRAND_NOTE_MANDATORY | BI_BRAND_ONLY_STATIC))
367 if (hdr->e_machine == bi->machine &&
368 bi->interp_path != NULL &&
369 /* ELF image p_filesz includes terminating zero */
370 strlen(bi->interp_path) + 1 == interp_name_len &&
371 strncmp(interp, bi->interp_path, interp_name_len)
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)
391 __elfN(check_header)(const Elf_Ehdr *hdr)
397 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
398 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
399 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
400 hdr->e_phentsize != sizeof(Elf_Phdr) ||
401 hdr->e_version != ELF_TARG_VER)
405 * Make sure we have at least one brand for this machine.
408 for (i = 0; i < MAX_BRANDS; i++) {
409 bi = elf_brand_list[i];
410 if (bi != NULL && bi->machine == hdr->e_machine)
420 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
421 vm_offset_t start, vm_offset_t end, vm_prot_t prot)
428 * Create the page if it doesn't exist yet. Ignore errors.
430 vm_map_fixed(map, NULL, 0, trunc_page(start), round_page(end) -
431 trunc_page(start), VM_PROT_ALL, VM_PROT_ALL, MAP_CHECK_EXCL);
434 * Find the page from the underlying object.
436 if (object != NULL) {
437 sf = vm_imgact_map_page(object, offset);
439 return (KERN_FAILURE);
440 off = offset - trunc_page(offset);
441 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start,
443 vm_imgact_unmap_page(sf);
445 return (KERN_FAILURE);
448 return (KERN_SUCCESS);
452 __elfN(map_insert)(struct image_params *imgp, vm_map_t map, vm_object_t object,
453 vm_ooffset_t offset, vm_offset_t start, vm_offset_t end, vm_prot_t prot,
459 int error, locked, rv;
461 if (start != trunc_page(start)) {
462 rv = __elfN(map_partial)(map, object, offset, start,
463 round_page(start), prot);
464 if (rv != KERN_SUCCESS)
466 offset += round_page(start) - start;
467 start = round_page(start);
469 if (end != round_page(end)) {
470 rv = __elfN(map_partial)(map, object, offset +
471 trunc_page(end) - start, trunc_page(end), end, prot);
472 if (rv != KERN_SUCCESS)
474 end = trunc_page(end);
477 return (KERN_SUCCESS);
478 if ((offset & PAGE_MASK) != 0) {
480 * The mapping is not page aligned. This means that we have
483 rv = vm_map_fixed(map, NULL, 0, start, end - start,
484 prot | VM_PROT_WRITE, VM_PROT_ALL, MAP_CHECK_EXCL);
485 if (rv != KERN_SUCCESS)
488 return (KERN_SUCCESS);
489 for (; start < end; start += sz) {
490 sf = vm_imgact_map_page(object, offset);
492 return (KERN_FAILURE);
493 off = offset - trunc_page(offset);
495 if (sz > PAGE_SIZE - off)
496 sz = PAGE_SIZE - off;
497 error = copyout((caddr_t)sf_buf_kva(sf) + off,
499 vm_imgact_unmap_page(sf);
501 return (KERN_FAILURE);
505 vm_object_reference(object);
506 rv = vm_map_fixed(map, object, offset, start, end - start,
507 prot, VM_PROT_ALL, cow | MAP_CHECK_EXCL);
508 if (rv != KERN_SUCCESS) {
509 locked = VOP_ISLOCKED(imgp->vp);
510 VOP_UNLOCK(imgp->vp, 0);
511 vm_object_deallocate(object);
512 vn_lock(imgp->vp, locked | LK_RETRY);
516 return (KERN_SUCCESS);
520 __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset,
521 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
528 vm_offset_t off, map_addr;
531 vm_ooffset_t file_addr;
534 * It's necessary to fail if the filsz + offset taken from the
535 * header is greater than the actual file pager object's size.
536 * If we were to allow this, then the vm_map_find() below would
537 * walk right off the end of the file object and into the ether.
539 * While I'm here, might as well check for something else that
540 * is invalid: filsz cannot be greater than memsz.
542 if ((filsz != 0 && (off_t)filsz + offset > imgp->attr->va_size) ||
544 uprintf("elf_load_section: truncated ELF file\n");
548 object = imgp->object;
549 map = &imgp->proc->p_vmspace->vm_map;
550 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize);
551 file_addr = trunc_page_ps(offset, pagesize);
554 * We have two choices. We can either clear the data in the last page
555 * of an oversized mapping, or we can start the anon mapping a page
556 * early and copy the initialized data into that first page. We
561 else if (memsz > filsz)
562 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr;
564 map_len = round_page_ps(offset + filsz, pagesize) - file_addr;
567 /* cow flags: don't dump readonly sections in core */
568 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
569 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
571 rv = __elfN(map_insert)(imgp, map,
573 file_addr, /* file offset */
574 map_addr, /* virtual start */
575 map_addr + map_len,/* virtual end */
578 if (rv != KERN_SUCCESS)
581 /* we can stop now if we've covered it all */
588 * We have to get the remaining bit of the file into the first part
589 * of the oversized map segment. This is normally because the .data
590 * segment in the file is extended to provide bss. It's a neat idea
591 * to try and save a page, but it's a pain in the behind to implement.
593 copy_len = filsz == 0 ? 0 : (offset + filsz) - trunc_page_ps(offset +
595 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize);
596 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) -
599 /* This had damn well better be true! */
601 rv = __elfN(map_insert)(imgp, map, NULL, 0, map_addr,
602 map_addr + map_len, prot, 0);
603 if (rv != KERN_SUCCESS)
608 sf = vm_imgact_map_page(object, offset + filsz);
612 /* send the page fragment to user space */
613 off = trunc_page_ps(offset + filsz, pagesize) -
614 trunc_page(offset + filsz);
615 error = copyout((caddr_t)sf_buf_kva(sf) + off,
616 (caddr_t)map_addr, copy_len);
617 vm_imgact_unmap_page(sf);
623 * Remove write access to the page if it was only granted by map_insert
626 if ((prot & VM_PROT_WRITE) == 0)
627 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr +
628 map_len), prot, FALSE);
634 * Load the file "file" into memory. It may be either a shared object
637 * The "addr" reference parameter is in/out. On entry, it specifies
638 * the address where a shared object should be loaded. If the file is
639 * an executable, this value is ignored. On exit, "addr" specifies
640 * where the file was actually loaded.
642 * The "entry" reference parameter is out only. On exit, it specifies
643 * the entry point for the loaded file.
646 __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
647 u_long *entry, size_t pagesize)
652 struct image_params image_params;
654 const Elf_Ehdr *hdr = NULL;
655 const Elf_Phdr *phdr = NULL;
656 struct nameidata *nd;
658 struct image_params *imgp;
661 u_long base_addr = 0;
662 int error, i, numsegs;
664 #ifdef CAPABILITY_MODE
666 * XXXJA: This check can go away once we are sufficiently confident
667 * that the checks in namei() are correct.
669 if (IN_CAPABILITY_MODE(curthread))
673 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
675 attr = &tempdata->attr;
676 imgp = &tempdata->image_params;
679 * Initialize part of the common data
683 imgp->firstpage = NULL;
684 imgp->image_header = NULL;
686 imgp->execlabel = NULL;
688 NDINIT(nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, curthread);
689 if ((error = namei(nd)) != 0) {
693 NDFREE(nd, NDF_ONLY_PNBUF);
694 imgp->vp = nd->ni_vp;
697 * Check permissions, modes, uid, etc on the file, and "open" it.
699 error = exec_check_permissions(imgp);
703 error = exec_map_first_page(imgp);
708 * Also make certain that the interpreter stays the same, so set
709 * its VV_TEXT flag, too.
711 VOP_SET_TEXT(nd->ni_vp);
713 imgp->object = nd->ni_vp->v_object;
715 hdr = (const Elf_Ehdr *)imgp->image_header;
716 if ((error = __elfN(check_header)(hdr)) != 0)
718 if (hdr->e_type == ET_DYN)
720 else if (hdr->e_type == ET_EXEC)
727 /* Only support headers that fit within first page for now */
728 if ((hdr->e_phoff > PAGE_SIZE) ||
729 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
734 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
735 if (!aligned(phdr, Elf_Addr)) {
740 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
741 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) {
742 /* Loadable segment */
743 prot = __elfN(trans_prot)(phdr[i].p_flags);
744 error = __elfN(load_section)(imgp, phdr[i].p_offset,
745 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase,
746 phdr[i].p_memsz, phdr[i].p_filesz, prot, pagesize);
750 * Establish the base address if this is the
754 base_addr = trunc_page(phdr[i].p_vaddr +
760 *entry = (unsigned long)hdr->e_entry + rbase;
764 exec_unmap_first_page(imgp);
769 free(tempdata, M_TEMP);
775 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
779 const Elf_Phdr *phdr;
780 Elf_Auxargs *elf_auxargs;
781 struct vmspace *vmspace;
782 const char *err_str, *newinterp;
783 char *interp, *interp_buf, *path;
784 Elf_Brandinfo *brand_info;
785 struct sysentvec *sv;
787 u_long text_size, data_size, total_size, text_addr, data_addr;
788 u_long seg_size, seg_addr, addr, baddr, et_dyn_addr, entry, proghdr;
790 int error, i, n, interp_name_len, have_interp;
792 hdr = (const Elf_Ehdr *)imgp->image_header;
795 * Do we have a valid ELF header ?
797 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later
798 * if particular brand doesn't support it.
800 if (__elfN(check_header)(hdr) != 0 ||
801 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
805 * From here on down, we return an errno, not -1, as we've
806 * detected an ELF file.
809 if ((hdr->e_phoff > PAGE_SIZE) ||
810 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
811 /* Only support headers in first page for now */
812 uprintf("Program headers not in the first page\n");
815 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
816 if (!aligned(phdr, Elf_Addr)) {
817 uprintf("Unaligned program headers\n");
824 text_size = data_size = total_size = text_addr = data_addr = 0;
827 err_str = newinterp = NULL;
828 interp = interp_buf = NULL;
831 for (i = 0; i < hdr->e_phnum; i++) {
832 switch (phdr[i].p_type) {
835 baddr = phdr[i].p_vaddr;
839 /* Path to interpreter */
840 if (phdr[i].p_filesz > MAXPATHLEN) {
841 uprintf("Invalid PT_INTERP\n");
845 if (interp != NULL) {
846 uprintf("Multiple PT_INTERP headers\n");
850 interp_name_len = phdr[i].p_filesz;
851 if (phdr[i].p_offset > PAGE_SIZE ||
852 interp_name_len > PAGE_SIZE - phdr[i].p_offset) {
853 VOP_UNLOCK(imgp->vp, 0);
854 interp_buf = malloc(interp_name_len + 1, M_TEMP,
856 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
857 error = vn_rdwr(UIO_READ, imgp->vp, interp_buf,
858 interp_name_len, phdr[i].p_offset,
859 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
862 uprintf("i/o error PT_INTERP\n");
865 interp_buf[interp_name_len] = '\0';
868 interp = __DECONST(char *, imgp->image_header) +
875 __elfN(trans_prot)(phdr[i].p_flags);
876 imgp->stack_sz = phdr[i].p_memsz;
881 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len,
883 if (brand_info == NULL) {
884 uprintf("ELF binary type \"%u\" not known.\n",
885 hdr->e_ident[EI_OSABI]);
890 if (hdr->e_type == ET_DYN) {
891 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) {
892 uprintf("Cannot execute shared object\n");
897 * Honour the base load address from the dso if it is
898 * non-zero for some reason.
901 et_dyn_addr = ET_DYN_LOAD_ADDR;
903 sv = brand_info->sysvec;
904 if (interp != NULL && brand_info->interp_newpath != NULL)
905 newinterp = brand_info->interp_newpath;
908 * Avoid a possible deadlock if the current address space is destroyed
909 * and that address space maps the locked vnode. In the common case,
910 * the locked vnode's v_usecount is decremented but remains greater
911 * than zero. Consequently, the vnode lock is not needed by vrele().
912 * However, in cases where the vnode lock is external, such as nullfs,
913 * v_usecount may become zero.
915 * The VV_TEXT flag prevents modifications to the executable while
916 * the vnode is unlocked.
918 VOP_UNLOCK(imgp->vp, 0);
920 error = exec_new_vmspace(imgp, sv);
921 imgp->proc->p_sysent = sv;
923 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
927 for (i = 0; i < hdr->e_phnum; i++) {
928 switch (phdr[i].p_type) {
929 case PT_LOAD: /* Loadable segment */
930 if (phdr[i].p_memsz == 0)
932 prot = __elfN(trans_prot)(phdr[i].p_flags);
933 error = __elfN(load_section)(imgp, phdr[i].p_offset,
934 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr,
935 phdr[i].p_memsz, phdr[i].p_filesz, prot,
941 * If this segment contains the program headers,
942 * remember their virtual address for the AT_PHDR
943 * aux entry. Static binaries don't usually include
946 if (phdr[i].p_offset == 0 &&
947 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize
949 proghdr = phdr[i].p_vaddr + hdr->e_phoff +
952 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
953 seg_size = round_page(phdr[i].p_memsz +
954 phdr[i].p_vaddr + et_dyn_addr - seg_addr);
957 * Make the largest executable segment the official
958 * text segment and all others data.
960 * Note that obreak() assumes that data_addr +
961 * data_size == end of data load area, and the ELF
962 * file format expects segments to be sorted by
963 * address. If multiple data segments exist, the
964 * last one will be used.
967 if (phdr[i].p_flags & PF_X && text_size < seg_size) {
968 text_size = seg_size;
969 text_addr = seg_addr;
971 data_size = seg_size;
972 data_addr = seg_addr;
974 total_size += seg_size;
976 case PT_PHDR: /* Program header table info */
977 proghdr = phdr[i].p_vaddr + et_dyn_addr;
984 if (data_addr == 0 && data_size == 0) {
985 data_addr = text_addr;
986 data_size = text_size;
989 entry = (u_long)hdr->e_entry + et_dyn_addr;
992 * Check limits. It should be safe to check the
993 * limits after loading the segments since we do
994 * not actually fault in all the segments pages.
996 PROC_LOCK(imgp->proc);
997 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA))
998 err_str = "Data segment size exceeds process limit";
999 else if (text_size > maxtsiz)
1000 err_str = "Text segment size exceeds system limit";
1001 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM))
1002 err_str = "Total segment size exceeds process limit";
1003 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0)
1004 err_str = "Data segment size exceeds resource limit";
1005 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0)
1006 err_str = "Total segment size exceeds resource limit";
1007 if (err_str != NULL) {
1008 PROC_UNLOCK(imgp->proc);
1009 uprintf("%s\n", err_str);
1014 vmspace = imgp->proc->p_vmspace;
1015 vmspace->vm_tsize = text_size >> PAGE_SHIFT;
1016 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
1017 vmspace->vm_dsize = data_size >> PAGE_SHIFT;
1018 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
1021 * We load the dynamic linker where a userland call
1022 * to mmap(0, ...) would put it. The rationale behind this
1023 * calculation is that it leaves room for the heap to grow to
1024 * its maximum allowed size.
1026 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td,
1028 PROC_UNLOCK(imgp->proc);
1030 imgp->entry_addr = entry;
1032 if (interp != NULL) {
1033 have_interp = FALSE;
1034 VOP_UNLOCK(imgp->vp, 0);
1035 if (brand_info->emul_path != NULL &&
1036 brand_info->emul_path[0] != '\0') {
1037 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1038 snprintf(path, MAXPATHLEN, "%s%s",
1039 brand_info->emul_path, interp);
1040 error = __elfN(load_file)(imgp->proc, path, &addr,
1041 &imgp->entry_addr, sv->sv_pagesize);
1046 if (!have_interp && newinterp != NULL &&
1047 (brand_info->interp_path == NULL ||
1048 strcmp(interp, brand_info->interp_path) == 0)) {
1049 error = __elfN(load_file)(imgp->proc, newinterp, &addr,
1050 &imgp->entry_addr, sv->sv_pagesize);
1055 error = __elfN(load_file)(imgp->proc, interp, &addr,
1056 &imgp->entry_addr, sv->sv_pagesize);
1058 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
1060 uprintf("ELF interpreter %s not found, error %d\n",
1068 * Construct auxargs table (used by the fixup routine)
1070 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
1071 elf_auxargs->execfd = -1;
1072 elf_auxargs->phdr = proghdr;
1073 elf_auxargs->phent = hdr->e_phentsize;
1074 elf_auxargs->phnum = hdr->e_phnum;
1075 elf_auxargs->pagesz = PAGE_SIZE;
1076 elf_auxargs->base = addr;
1077 elf_auxargs->flags = 0;
1078 elf_auxargs->entry = entry;
1079 elf_auxargs->hdr_eflags = hdr->e_flags;
1081 imgp->auxargs = elf_auxargs;
1082 imgp->interpreted = 0;
1083 imgp->reloc_base = addr;
1084 imgp->proc->p_osrel = osrel;
1085 imgp->proc->p_elf_machine = hdr->e_machine;
1086 imgp->proc->p_elf_flags = hdr->e_flags;
1089 free(interp_buf, M_TEMP);
1093 #define suword __CONCAT(suword, __ELF_WORD_SIZE)
1096 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp)
1098 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
1102 base = (Elf_Addr *)*stack_base;
1103 pos = base + (imgp->args->argc + imgp->args->envc + 2);
1105 if (args->execfd != -1)
1106 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
1107 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
1108 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
1109 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
1110 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
1111 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
1112 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
1113 AUXARGS_ENTRY(pos, AT_BASE, args->base);
1114 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags);
1115 if (imgp->execpathp != 0)
1116 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp);
1117 AUXARGS_ENTRY(pos, AT_OSRELDATE,
1118 imgp->proc->p_ucred->cr_prison->pr_osreldate);
1119 if (imgp->canary != 0) {
1120 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary);
1121 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen);
1123 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus);
1124 if (imgp->pagesizes != 0) {
1125 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes);
1126 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen);
1128 if (imgp->sysent->sv_timekeep_base != 0) {
1129 AUXARGS_ENTRY(pos, AT_TIMEKEEP,
1130 imgp->sysent->sv_timekeep_base);
1132 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj
1133 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot :
1134 imgp->sysent->sv_stackprot);
1135 if (imgp->sysent->sv_hwcap != NULL)
1136 AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap);
1137 if (imgp->sysent->sv_hwcap2 != NULL)
1138 AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2);
1139 AUXARGS_ENTRY(pos, AT_NULL, 0);
1141 free(imgp->auxargs, M_TEMP);
1142 imgp->auxargs = NULL;
1145 suword(base, (long)imgp->args->argc);
1146 *stack_base = (register_t *)base;
1151 * Code for generating ELF core dumps.
1154 typedef void (*segment_callback)(vm_map_entry_t, void *);
1156 /* Closure for cb_put_phdr(). */
1157 struct phdr_closure {
1158 Elf_Phdr *phdr; /* Program header to fill in */
1159 Elf_Off offset; /* Offset of segment in core file */
1162 /* Closure for cb_size_segment(). */
1163 struct sseg_closure {
1164 int count; /* Count of writable segments. */
1165 size_t size; /* Total size of all writable segments. */
1168 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *);
1171 int type; /* Note type. */
1172 outfunc_t outfunc; /* Output function. */
1173 void *outarg; /* Argument for the output function. */
1174 size_t outsize; /* Output size. */
1175 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */
1178 TAILQ_HEAD(note_info_list, note_info);
1180 /* Coredump output parameters. */
1181 struct coredump_params {
1183 struct ucred *active_cred;
1184 struct ucred *file_cred;
1187 struct compressor *comp;
1190 extern int compress_user_cores;
1191 extern int compress_user_cores_level;
1193 static void cb_put_phdr(vm_map_entry_t, void *);
1194 static void cb_size_segment(vm_map_entry_t, void *);
1195 static int core_write(struct coredump_params *, const void *, size_t, off_t,
1197 static void each_dumpable_segment(struct thread *, segment_callback, void *);
1198 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t,
1199 struct note_info_list *, size_t);
1200 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *,
1202 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t);
1203 static void __elfN(putnote)(struct note_info *, struct sbuf *);
1204 static size_t register_note(struct note_info_list *, int, outfunc_t, void *);
1205 static int sbuf_drain_core_output(void *, const char *, int);
1206 static int sbuf_drain_count(void *arg, const char *data, int len);
1208 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *);
1209 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *);
1210 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *);
1211 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *);
1212 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *);
1213 static void __elfN(note_ptlwpinfo)(void *, struct sbuf *, size_t *);
1214 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *);
1215 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *);
1216 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *);
1217 static void note_procstat_files(void *, struct sbuf *, size_t *);
1218 static void note_procstat_groups(void *, struct sbuf *, size_t *);
1219 static void note_procstat_osrel(void *, struct sbuf *, size_t *);
1220 static void note_procstat_rlimit(void *, struct sbuf *, size_t *);
1221 static void note_procstat_umask(void *, struct sbuf *, size_t *);
1222 static void note_procstat_vmmap(void *, struct sbuf *, size_t *);
1225 * Write out a core segment to the compression stream.
1228 compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len)
1234 chunk_len = MIN(len, CORE_BUF_SIZE);
1237 * We can get EFAULT error here.
1238 * In that case zero out the current chunk of the segment.
1240 error = copyin(base, buf, chunk_len);
1242 bzero(buf, chunk_len);
1243 error = compressor_write(p->comp, buf, chunk_len);
1253 core_compressed_write(void *base, size_t len, off_t offset, void *arg)
1256 return (core_write((struct coredump_params *)arg, base, len, offset,
1261 core_write(struct coredump_params *p, const void *base, size_t len,
1262 off_t offset, enum uio_seg seg)
1265 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, __DECONST(void *, base),
1266 len, offset, seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED,
1267 p->active_cred, p->file_cred, NULL, p->td));
1271 core_output(void *base, size_t len, off_t offset, struct coredump_params *p,
1276 if (p->comp != NULL)
1277 return (compress_chunk(p, base, tmpbuf, len));
1280 * EFAULT is a non-fatal error that we can get, for example,
1281 * if the segment is backed by a file but extends beyond its
1284 error = core_write(p, base, len, offset, UIO_USERSPACE);
1285 if (error == EFAULT) {
1286 log(LOG_WARNING, "Failed to fully fault in a core file segment "
1287 "at VA %p with size 0x%zx to be written at offset 0x%jx "
1288 "for process %s\n", base, len, offset, curproc->p_comm);
1291 * Write a "real" zero byte at the end of the target region
1292 * in the case this is the last segment.
1293 * The intermediate space will be implicitly zero-filled.
1295 error = core_write(p, zero_region, 1, offset + len - 1,
1302 * Drain into a core file.
1305 sbuf_drain_core_output(void *arg, const char *data, int len)
1307 struct coredump_params *p;
1310 p = (struct coredump_params *)arg;
1313 * Some kern_proc out routines that print to this sbuf may
1314 * call us with the process lock held. Draining with the
1315 * non-sleepable lock held is unsafe. The lock is needed for
1316 * those routines when dumping a live process. In our case we
1317 * can safely release the lock before draining and acquire
1320 locked = PROC_LOCKED(p->td->td_proc);
1322 PROC_UNLOCK(p->td->td_proc);
1323 if (p->comp != NULL)
1324 error = compressor_write(p->comp, __DECONST(char *, data), len);
1326 error = core_write(p, __DECONST(void *, data), len, p->offset,
1329 PROC_LOCK(p->td->td_proc);
1337 * Drain into a counter.
1340 sbuf_drain_count(void *arg, const char *data __unused, int len)
1344 sizep = (size_t *)arg;
1350 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags)
1352 struct ucred *cred = td->td_ucred;
1354 struct sseg_closure seginfo;
1355 struct note_info_list notelst;
1356 struct coredump_params params;
1357 struct note_info *ninfo;
1359 size_t hdrsize, notesz, coresize;
1363 TAILQ_INIT(¬elst);
1365 /* Size the program segments. */
1368 each_dumpable_segment(td, cb_size_segment, &seginfo);
1371 * Collect info about the core file header area.
1373 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count);
1374 if (seginfo.count + 1 >= PN_XNUM)
1375 hdrsize += sizeof(Elf_Shdr);
1376 __elfN(prepare_notes)(td, ¬elst, ¬esz);
1377 coresize = round_page(hdrsize + notesz) + seginfo.size;
1379 /* Set up core dump parameters. */
1381 params.active_cred = cred;
1382 params.file_cred = NOCRED;
1389 PROC_LOCK(td->td_proc);
1390 error = racct_add(td->td_proc, RACCT_CORE, coresize);
1391 PROC_UNLOCK(td->td_proc);
1398 if (coresize >= limit) {
1403 /* Create a compression stream if necessary. */
1404 if (compress_user_cores != 0) {
1405 params.comp = compressor_init(core_compressed_write,
1406 compress_user_cores, CORE_BUF_SIZE,
1407 compress_user_cores_level, ¶ms);
1408 if (params.comp == NULL) {
1412 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO);
1416 * Allocate memory for building the header, fill it up,
1417 * and write it out following the notes.
1419 hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
1420 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst,
1423 /* Write the contents of all of the writable segments. */
1429 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
1430 offset = round_page(hdrsize + notesz);
1431 for (i = 0; i < seginfo.count; i++) {
1432 error = core_output((caddr_t)(uintptr_t)php->p_vaddr,
1433 php->p_filesz, offset, ¶ms, tmpbuf);
1436 offset += php->p_filesz;
1439 if (error == 0 && params.comp != NULL)
1440 error = compressor_flush(params.comp);
1444 "Failed to write core file for process %s (error %d)\n",
1445 curproc->p_comm, error);
1449 free(tmpbuf, M_TEMP);
1450 if (params.comp != NULL)
1451 compressor_fini(params.comp);
1452 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) {
1453 TAILQ_REMOVE(¬elst, ninfo, link);
1454 free(ninfo, M_TEMP);
1463 * A callback for each_dumpable_segment() to write out the segment's
1464 * program header entry.
1467 cb_put_phdr(entry, closure)
1468 vm_map_entry_t entry;
1471 struct phdr_closure *phc = (struct phdr_closure *)closure;
1472 Elf_Phdr *phdr = phc->phdr;
1474 phc->offset = round_page(phc->offset);
1476 phdr->p_type = PT_LOAD;
1477 phdr->p_offset = phc->offset;
1478 phdr->p_vaddr = entry->start;
1480 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1481 phdr->p_align = PAGE_SIZE;
1482 phdr->p_flags = __elfN(untrans_prot)(entry->protection);
1484 phc->offset += phdr->p_filesz;
1489 * A callback for each_dumpable_segment() to gather information about
1490 * the number of segments and their total size.
1493 cb_size_segment(vm_map_entry_t entry, void *closure)
1495 struct sseg_closure *ssc = (struct sseg_closure *)closure;
1498 ssc->size += entry->end - entry->start;
1502 * For each writable segment in the process's memory map, call the given
1503 * function with a pointer to the map entry and some arbitrary
1504 * caller-supplied data.
1507 each_dumpable_segment(struct thread *td, segment_callback func, void *closure)
1509 struct proc *p = td->td_proc;
1510 vm_map_t map = &p->p_vmspace->vm_map;
1511 vm_map_entry_t entry;
1512 vm_object_t backing_object, object;
1513 boolean_t ignore_entry;
1515 vm_map_lock_read(map);
1516 for (entry = map->header.next; entry != &map->header;
1517 entry = entry->next) {
1519 * Don't dump inaccessible mappings, deal with legacy
1522 * Note that read-only segments related to the elf binary
1523 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1524 * need to arbitrarily ignore such segments.
1526 if (elf_legacy_coredump) {
1527 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW)
1530 if ((entry->protection & VM_PROT_ALL) == 0)
1535 * Dont include memory segment in the coredump if
1536 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1537 * madvise(2). Do not dump submaps (i.e. parts of the
1540 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP))
1543 if ((object = entry->object.vm_object) == NULL)
1546 /* Ignore memory-mapped devices and such things. */
1547 VM_OBJECT_RLOCK(object);
1548 while ((backing_object = object->backing_object) != NULL) {
1549 VM_OBJECT_RLOCK(backing_object);
1550 VM_OBJECT_RUNLOCK(object);
1551 object = backing_object;
1553 ignore_entry = object->type != OBJT_DEFAULT &&
1554 object->type != OBJT_SWAP && object->type != OBJT_VNODE &&
1555 object->type != OBJT_PHYS;
1556 VM_OBJECT_RUNLOCK(object);
1560 (*func)(entry, closure);
1562 vm_map_unlock_read(map);
1566 * Write the core file header to the file, including padding up to
1567 * the page boundary.
1570 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr,
1571 size_t hdrsize, struct note_info_list *notelst, size_t notesz)
1573 struct note_info *ninfo;
1577 /* Fill in the header. */
1578 bzero(hdr, hdrsize);
1579 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz);
1581 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN);
1582 sbuf_set_drain(sb, sbuf_drain_core_output, p);
1583 sbuf_start_section(sb, NULL);
1584 sbuf_bcat(sb, hdr, hdrsize);
1585 TAILQ_FOREACH(ninfo, notelst, link)
1586 __elfN(putnote)(ninfo, sb);
1587 /* Align up to a page boundary for the program segments. */
1588 sbuf_end_section(sb, -1, PAGE_SIZE, 0);
1589 error = sbuf_finish(sb);
1596 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list,
1606 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p);
1609 * To have the debugger select the right thread (LWP) as the initial
1610 * thread, we dump the state of the thread passed to us in td first.
1611 * This is the thread that causes the core dump and thus likely to
1612 * be the right thread one wants to have selected in the debugger.
1615 while (thr != NULL) {
1616 size += register_note(list, NT_PRSTATUS,
1617 __elfN(note_prstatus), thr);
1618 size += register_note(list, NT_FPREGSET,
1619 __elfN(note_fpregset), thr);
1620 size += register_note(list, NT_THRMISC,
1621 __elfN(note_thrmisc), thr);
1622 size += register_note(list, NT_PTLWPINFO,
1623 __elfN(note_ptlwpinfo), thr);
1624 size += register_note(list, -1,
1625 __elfN(note_threadmd), thr);
1627 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) :
1628 TAILQ_NEXT(thr, td_plist);
1630 thr = TAILQ_NEXT(thr, td_plist);
1633 size += register_note(list, NT_PROCSTAT_PROC,
1634 __elfN(note_procstat_proc), p);
1635 size += register_note(list, NT_PROCSTAT_FILES,
1636 note_procstat_files, p);
1637 size += register_note(list, NT_PROCSTAT_VMMAP,
1638 note_procstat_vmmap, p);
1639 size += register_note(list, NT_PROCSTAT_GROUPS,
1640 note_procstat_groups, p);
1641 size += register_note(list, NT_PROCSTAT_UMASK,
1642 note_procstat_umask, p);
1643 size += register_note(list, NT_PROCSTAT_RLIMIT,
1644 note_procstat_rlimit, p);
1645 size += register_note(list, NT_PROCSTAT_OSREL,
1646 note_procstat_osrel, p);
1647 size += register_note(list, NT_PROCSTAT_PSSTRINGS,
1648 __elfN(note_procstat_psstrings), p);
1649 size += register_note(list, NT_PROCSTAT_AUXV,
1650 __elfN(note_procstat_auxv), p);
1656 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs,
1662 struct phdr_closure phc;
1664 ehdr = (Elf_Ehdr *)hdr;
1666 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1667 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1668 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1669 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1670 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1671 ehdr->e_ident[EI_DATA] = ELF_DATA;
1672 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1673 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
1674 ehdr->e_ident[EI_ABIVERSION] = 0;
1675 ehdr->e_ident[EI_PAD] = 0;
1676 ehdr->e_type = ET_CORE;
1677 ehdr->e_machine = td->td_proc->p_elf_machine;
1678 ehdr->e_version = EV_CURRENT;
1680 ehdr->e_phoff = sizeof(Elf_Ehdr);
1681 ehdr->e_flags = td->td_proc->p_elf_flags;
1682 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1683 ehdr->e_phentsize = sizeof(Elf_Phdr);
1684 ehdr->e_shentsize = sizeof(Elf_Shdr);
1685 ehdr->e_shstrndx = SHN_UNDEF;
1686 if (numsegs + 1 < PN_XNUM) {
1687 ehdr->e_phnum = numsegs + 1;
1690 ehdr->e_phnum = PN_XNUM;
1693 ehdr->e_shoff = ehdr->e_phoff +
1694 (numsegs + 1) * ehdr->e_phentsize;
1695 KASSERT(ehdr->e_shoff == hdrsize - sizeof(Elf_Shdr),
1696 ("e_shoff: %zu, hdrsize - shdr: %zu",
1697 (size_t)ehdr->e_shoff, hdrsize - sizeof(Elf_Shdr)));
1699 shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff);
1700 memset(shdr, 0, sizeof(*shdr));
1702 * A special first section is used to hold large segment and
1703 * section counts. This was proposed by Sun Microsystems in
1704 * Solaris and has been adopted by Linux; the standard ELF
1705 * tools are already familiar with the technique.
1707 * See table 7-7 of the Solaris "Linker and Libraries Guide"
1708 * (or 12-7 depending on the version of the document) for more
1711 shdr->sh_type = SHT_NULL;
1712 shdr->sh_size = ehdr->e_shnum;
1713 shdr->sh_link = ehdr->e_shstrndx;
1714 shdr->sh_info = numsegs + 1;
1718 * Fill in the program header entries.
1720 phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff);
1722 /* The note segement. */
1723 phdr->p_type = PT_NOTE;
1724 phdr->p_offset = hdrsize;
1727 phdr->p_filesz = notesz;
1729 phdr->p_flags = PF_R;
1730 phdr->p_align = ELF_NOTE_ROUNDSIZE;
1733 /* All the writable segments from the program. */
1735 phc.offset = round_page(hdrsize + notesz);
1736 each_dumpable_segment(td, cb_put_phdr, &phc);
1740 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg)
1742 struct note_info *ninfo;
1743 size_t size, notesize;
1746 out(arg, NULL, &size);
1747 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK);
1749 ninfo->outfunc = out;
1750 ninfo->outarg = arg;
1751 ninfo->outsize = size;
1752 TAILQ_INSERT_TAIL(list, ninfo, link);
1757 notesize = sizeof(Elf_Note) + /* note header */
1758 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
1760 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
1766 append_note_data(const void *src, void *dst, size_t len)
1770 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE);
1772 bcopy(src, dst, len);
1773 bzero((char *)dst + len, padded_len - len);
1775 return (padded_len);
1779 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp)
1787 note = (Elf_Note *)buf;
1788 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR);
1789 note->n_descsz = size;
1790 note->n_type = type;
1791 buf += sizeof(*note);
1792 buf += append_note_data(FREEBSD_ABI_VENDOR, buf,
1793 sizeof(FREEBSD_ABI_VENDOR));
1794 append_note_data(src, buf, size);
1799 notesize = sizeof(Elf_Note) + /* note header */
1800 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
1802 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
1808 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb)
1811 ssize_t old_len, sect_len;
1812 size_t new_len, descsz, i;
1814 if (ninfo->type == -1) {
1815 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
1819 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR);
1820 note.n_descsz = ninfo->outsize;
1821 note.n_type = ninfo->type;
1823 sbuf_bcat(sb, ¬e, sizeof(note));
1824 sbuf_start_section(sb, &old_len);
1825 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR));
1826 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
1827 if (note.n_descsz == 0)
1829 sbuf_start_section(sb, &old_len);
1830 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
1831 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
1835 new_len = (size_t)sect_len;
1836 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE);
1837 if (new_len < descsz) {
1839 * It is expected that individual note emitters will correctly
1840 * predict their expected output size and fill up to that size
1841 * themselves, padding in a format-specific way if needed.
1842 * However, in case they don't, just do it here with zeros.
1844 for (i = 0; i < descsz - new_len; i++)
1846 } else if (new_len > descsz) {
1848 * We can't always truncate sb -- we may have drained some
1851 KASSERT(new_len == descsz, ("%s: Note type %u changed as we "
1852 "read it (%zu > %zu). Since it is longer than "
1853 "expected, this coredump's notes are corrupt. THIS "
1854 "IS A BUG in the note_procstat routine for type %u.\n",
1855 __func__, (unsigned)note.n_type, new_len, descsz,
1856 (unsigned)note.n_type));
1861 * Miscellaneous note out functions.
1864 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1865 #include <compat/freebsd32/freebsd32.h>
1866 #include <compat/freebsd32/freebsd32_signal.h>
1868 typedef struct prstatus32 elf_prstatus_t;
1869 typedef struct prpsinfo32 elf_prpsinfo_t;
1870 typedef struct fpreg32 elf_prfpregset_t;
1871 typedef struct fpreg32 elf_fpregset_t;
1872 typedef struct reg32 elf_gregset_t;
1873 typedef struct thrmisc32 elf_thrmisc_t;
1874 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32
1875 typedef struct kinfo_proc32 elf_kinfo_proc_t;
1876 typedef uint32_t elf_ps_strings_t;
1878 typedef prstatus_t elf_prstatus_t;
1879 typedef prpsinfo_t elf_prpsinfo_t;
1880 typedef prfpregset_t elf_prfpregset_t;
1881 typedef prfpregset_t elf_fpregset_t;
1882 typedef gregset_t elf_gregset_t;
1883 typedef thrmisc_t elf_thrmisc_t;
1884 #define ELF_KERN_PROC_MASK 0
1885 typedef struct kinfo_proc elf_kinfo_proc_t;
1886 typedef vm_offset_t elf_ps_strings_t;
1890 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep)
1896 elf_prpsinfo_t *psinfo;
1899 p = (struct proc *)arg;
1901 KASSERT(*sizep == sizeof(*psinfo), ("invalid size"));
1902 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK);
1903 psinfo->pr_version = PRPSINFO_VERSION;
1904 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t);
1905 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
1907 if (p->p_args != NULL) {
1908 len = sizeof(psinfo->pr_psargs) - 1;
1909 if (len > p->p_args->ar_length)
1910 len = p->p_args->ar_length;
1911 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len);
1917 sbuf_new(&sbarg, psinfo->pr_psargs,
1918 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN);
1919 error = proc_getargv(curthread, p, &sbarg);
1921 if (sbuf_finish(&sbarg) == 0)
1922 len = sbuf_len(&sbarg) - 1;
1924 len = sizeof(psinfo->pr_psargs) - 1;
1925 sbuf_delete(&sbarg);
1927 if (error || len == 0)
1928 strlcpy(psinfo->pr_psargs, p->p_comm,
1929 sizeof(psinfo->pr_psargs));
1931 KASSERT(len < sizeof(psinfo->pr_psargs),
1932 ("len is too long: %zu vs %zu", len,
1933 sizeof(psinfo->pr_psargs)));
1934 cp = psinfo->pr_psargs;
1937 cp = memchr(cp, '\0', end - cp);
1943 psinfo->pr_pid = p->p_pid;
1944 sbuf_bcat(sb, psinfo, sizeof(*psinfo));
1945 free(psinfo, M_TEMP);
1947 *sizep = sizeof(*psinfo);
1951 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep)
1954 elf_prstatus_t *status;
1956 td = (struct thread *)arg;
1958 KASSERT(*sizep == sizeof(*status), ("invalid size"));
1959 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK);
1960 status->pr_version = PRSTATUS_VERSION;
1961 status->pr_statussz = sizeof(elf_prstatus_t);
1962 status->pr_gregsetsz = sizeof(elf_gregset_t);
1963 status->pr_fpregsetsz = sizeof(elf_fpregset_t);
1964 status->pr_osreldate = osreldate;
1965 status->pr_cursig = td->td_proc->p_sig;
1966 status->pr_pid = td->td_tid;
1967 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1968 fill_regs32(td, &status->pr_reg);
1970 fill_regs(td, &status->pr_reg);
1972 sbuf_bcat(sb, status, sizeof(*status));
1973 free(status, M_TEMP);
1975 *sizep = sizeof(*status);
1979 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep)
1982 elf_prfpregset_t *fpregset;
1984 td = (struct thread *)arg;
1986 KASSERT(*sizep == sizeof(*fpregset), ("invalid size"));
1987 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK);
1988 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1989 fill_fpregs32(td, fpregset);
1991 fill_fpregs(td, fpregset);
1993 sbuf_bcat(sb, fpregset, sizeof(*fpregset));
1994 free(fpregset, M_TEMP);
1996 *sizep = sizeof(*fpregset);
2000 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep)
2003 elf_thrmisc_t thrmisc;
2005 td = (struct thread *)arg;
2007 KASSERT(*sizep == sizeof(thrmisc), ("invalid size"));
2008 bzero(&thrmisc._pad, sizeof(thrmisc._pad));
2009 strcpy(thrmisc.pr_tname, td->td_name);
2010 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc));
2012 *sizep = sizeof(thrmisc);
2016 __elfN(note_ptlwpinfo)(void *arg, struct sbuf *sb, size_t *sizep)
2021 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2022 struct ptrace_lwpinfo32 pl;
2024 struct ptrace_lwpinfo pl;
2027 td = (struct thread *)arg;
2028 size = sizeof(structsize) + sizeof(pl);
2030 KASSERT(*sizep == size, ("invalid size"));
2031 structsize = sizeof(pl);
2032 sbuf_bcat(sb, &structsize, sizeof(structsize));
2033 bzero(&pl, sizeof(pl));
2034 pl.pl_lwpid = td->td_tid;
2035 pl.pl_event = PL_EVENT_NONE;
2036 pl.pl_sigmask = td->td_sigmask;
2037 pl.pl_siglist = td->td_siglist;
2038 if (td->td_si.si_signo != 0) {
2039 pl.pl_event = PL_EVENT_SIGNAL;
2040 pl.pl_flags |= PL_FLAG_SI;
2041 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2042 siginfo_to_siginfo32(&td->td_si, &pl.pl_siginfo);
2044 pl.pl_siginfo = td->td_si;
2047 strcpy(pl.pl_tdname, td->td_name);
2048 /* XXX TODO: supply more information in struct ptrace_lwpinfo*/
2049 sbuf_bcat(sb, &pl, sizeof(pl));
2055 * Allow for MD specific notes, as well as any MD
2056 * specific preparations for writing MI notes.
2059 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep)
2065 td = (struct thread *)arg;
2067 if (size != 0 && sb != NULL)
2068 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK);
2072 __elfN(dump_thread)(td, buf, &size);
2073 KASSERT(sb == NULL || *sizep == size, ("invalid size"));
2074 if (size != 0 && sb != NULL)
2075 sbuf_bcat(sb, buf, size);
2080 #ifdef KINFO_PROC_SIZE
2081 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
2085 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep)
2091 p = (struct proc *)arg;
2092 size = sizeof(structsize) + p->p_numthreads *
2093 sizeof(elf_kinfo_proc_t);
2096 KASSERT(*sizep == size, ("invalid size"));
2097 structsize = sizeof(elf_kinfo_proc_t);
2098 sbuf_bcat(sb, &structsize, sizeof(structsize));
2099 sx_slock(&proctree_lock);
2101 kern_proc_out(p, sb, ELF_KERN_PROC_MASK);
2102 sx_sunlock(&proctree_lock);
2107 #ifdef KINFO_FILE_SIZE
2108 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE);
2112 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep)
2115 size_t size, sect_sz, i;
2116 ssize_t start_len, sect_len;
2117 int structsize, filedesc_flags;
2119 if (coredump_pack_fileinfo)
2120 filedesc_flags = KERN_FILEDESC_PACK_KINFO;
2124 p = (struct proc *)arg;
2125 structsize = sizeof(struct kinfo_file);
2128 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2129 sbuf_set_drain(sb, sbuf_drain_count, &size);
2130 sbuf_bcat(sb, &structsize, sizeof(structsize));
2132 kern_proc_filedesc_out(p, sb, -1, filedesc_flags);
2137 sbuf_start_section(sb, &start_len);
2139 sbuf_bcat(sb, &structsize, sizeof(structsize));
2141 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize),
2144 sect_len = sbuf_end_section(sb, start_len, 0, 0);
2149 KASSERT(sect_sz <= *sizep,
2150 ("kern_proc_filedesc_out did not respect maxlen; "
2151 "requested %zu, got %zu", *sizep - sizeof(structsize),
2152 sect_sz - sizeof(structsize)));
2154 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++)
2159 #ifdef KINFO_VMENTRY_SIZE
2160 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE);
2164 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep)
2168 int structsize, vmmap_flags;
2170 if (coredump_pack_vmmapinfo)
2171 vmmap_flags = KERN_VMMAP_PACK_KINFO;
2175 p = (struct proc *)arg;
2176 structsize = sizeof(struct kinfo_vmentry);
2179 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2180 sbuf_set_drain(sb, sbuf_drain_count, &size);
2181 sbuf_bcat(sb, &structsize, sizeof(structsize));
2183 kern_proc_vmmap_out(p, sb, -1, vmmap_flags);
2188 sbuf_bcat(sb, &structsize, sizeof(structsize));
2190 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize),
2196 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep)
2202 p = (struct proc *)arg;
2203 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t);
2205 KASSERT(*sizep == size, ("invalid size"));
2206 structsize = sizeof(gid_t);
2207 sbuf_bcat(sb, &structsize, sizeof(structsize));
2208 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups *
2215 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep)
2221 p = (struct proc *)arg;
2222 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask);
2224 KASSERT(*sizep == size, ("invalid size"));
2225 structsize = sizeof(p->p_fd->fd_cmask);
2226 sbuf_bcat(sb, &structsize, sizeof(structsize));
2227 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask));
2233 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep)
2236 struct rlimit rlim[RLIM_NLIMITS];
2240 p = (struct proc *)arg;
2241 size = sizeof(structsize) + sizeof(rlim);
2243 KASSERT(*sizep == size, ("invalid size"));
2244 structsize = sizeof(rlim);
2245 sbuf_bcat(sb, &structsize, sizeof(structsize));
2247 for (i = 0; i < RLIM_NLIMITS; i++)
2248 lim_rlimit_proc(p, i, &rlim[i]);
2250 sbuf_bcat(sb, rlim, sizeof(rlim));
2256 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep)
2262 p = (struct proc *)arg;
2263 size = sizeof(structsize) + sizeof(p->p_osrel);
2265 KASSERT(*sizep == size, ("invalid size"));
2266 structsize = sizeof(p->p_osrel);
2267 sbuf_bcat(sb, &structsize, sizeof(structsize));
2268 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel));
2274 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep)
2277 elf_ps_strings_t ps_strings;
2281 p = (struct proc *)arg;
2282 size = sizeof(structsize) + sizeof(ps_strings);
2284 KASSERT(*sizep == size, ("invalid size"));
2285 structsize = sizeof(ps_strings);
2286 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2287 ps_strings = PTROUT(p->p_sysent->sv_psstrings);
2289 ps_strings = p->p_sysent->sv_psstrings;
2291 sbuf_bcat(sb, &structsize, sizeof(structsize));
2292 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings));
2298 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep)
2304 p = (struct proc *)arg;
2307 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2308 sbuf_set_drain(sb, sbuf_drain_count, &size);
2309 sbuf_bcat(sb, &structsize, sizeof(structsize));
2311 proc_getauxv(curthread, p, sb);
2317 structsize = sizeof(Elf_Auxinfo);
2318 sbuf_bcat(sb, &structsize, sizeof(structsize));
2320 proc_getauxv(curthread, p, sb);
2326 __elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote,
2327 int32_t *osrel, const Elf_Phdr *pnote)
2329 const Elf_Note *note, *note0, *note_end;
2330 const char *note_name;
2335 /* We need some limit, might as well use PAGE_SIZE. */
2336 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE)
2338 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes");
2339 if (pnote->p_offset > PAGE_SIZE ||
2340 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) {
2341 VOP_UNLOCK(imgp->vp, 0);
2342 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK);
2343 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
2344 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz,
2345 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED,
2346 curthread->td_ucred, NOCRED, NULL, curthread);
2348 uprintf("i/o error PT_NOTE\n");
2352 note = note0 = (const Elf_Note *)buf;
2353 note_end = (const Elf_Note *)(buf + pnote->p_filesz);
2355 note = note0 = (const Elf_Note *)(imgp->image_header +
2357 note_end = (const Elf_Note *)(imgp->image_header +
2358 pnote->p_offset + pnote->p_filesz);
2361 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) {
2362 if (!aligned(note, Elf32_Addr) || (const char *)note_end -
2363 (const char *)note < sizeof(Elf_Note)) {
2367 if (note->n_namesz != checknote->hdr.n_namesz ||
2368 note->n_descsz != checknote->hdr.n_descsz ||
2369 note->n_type != checknote->hdr.n_type)
2371 note_name = (const char *)(note + 1);
2372 if (note_name + checknote->hdr.n_namesz >=
2373 (const char *)note_end || strncmp(checknote->vendor,
2374 note_name, checknote->hdr.n_namesz) != 0)
2378 * Fetch the osreldate for binary
2379 * from the ELF OSABI-note if necessary.
2381 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 &&
2382 checknote->trans_osrel != NULL) {
2383 res = checknote->trans_osrel(note, osrel);
2389 note = (const Elf_Note *)((const char *)(note + 1) +
2390 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) +
2391 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE));
2400 * Try to find the appropriate ABI-note section for checknote,
2401 * fetch the osreldate for binary from the ELF OSABI-note. Only the
2402 * first page of the image is searched, the same as for headers.
2405 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote,
2408 const Elf_Phdr *phdr;
2409 const Elf_Ehdr *hdr;
2412 hdr = (const Elf_Ehdr *)imgp->image_header;
2413 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
2415 for (i = 0; i < hdr->e_phnum; i++) {
2416 if (phdr[i].p_type == PT_NOTE &&
2417 __elfN(parse_notes)(imgp, checknote, osrel, &phdr[i]))
2425 * Tell kern_execve.c about it, with a little help from the linker.
2427 static struct execsw __elfN(execsw) = {
2428 __CONCAT(exec_, __elfN(imgact)),
2429 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
2431 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
2434 __elfN(trans_prot)(Elf_Word flags)
2440 prot |= VM_PROT_EXECUTE;
2442 prot |= VM_PROT_WRITE;
2444 prot |= VM_PROT_READ;
2445 #if __ELF_WORD_SIZE == 32
2446 #if defined(__amd64__)
2447 if (i386_read_exec && (flags & PF_R))
2448 prot |= VM_PROT_EXECUTE;
2455 __elfN(untrans_prot)(vm_prot_t prot)
2460 if (prot & VM_PROT_EXECUTE)
2462 if (prot & VM_PROT_READ)
2464 if (prot & VM_PROT_WRITE)