2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2017 Dell EMC
5 * Copyright (c) 2000-2001, 2003 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, int32_t *osrel, uint32_t *fctl0);
92 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
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);
96 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp);
97 static bool __elfN(freebsd_trans_osrel)(const Elf_Note *note,
99 static bool kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel);
100 static boolean_t __elfN(check_note)(struct image_params *imgp,
101 Elf_Brandnote *checknote, int32_t *osrel, uint32_t *fctl0);
102 static vm_prot_t __elfN(trans_prot)(Elf_Word);
103 static Elf_Word __elfN(untrans_prot)(vm_prot_t);
105 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0,
108 #define CORE_BUF_SIZE (16 * 1024)
110 int __elfN(fallback_brand) = -1;
111 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
112 fallback_brand, CTLFLAG_RWTUN, &__elfN(fallback_brand), 0,
113 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort");
115 static int elf_legacy_coredump = 0;
116 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW,
117 &elf_legacy_coredump, 0,
118 "include all and only RW pages in core dumps");
120 int __elfN(nxstack) =
121 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */ || \
122 (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 && (defined(__amd64__) || defined(__i386__))
133 int i386_read_exec = 0;
134 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0,
135 "enable execution from readable segments");
138 SYSCTL_NODE(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, aslr, CTLFLAG_RW, 0,
140 #define ASLR_NODE_OID __CONCAT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), _aslr)
142 static int __elfN(aslr_enabled) = 0;
143 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, enable, CTLFLAG_RWTUN,
144 &__elfN(aslr_enabled), 0,
145 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
146 ": enable address map randomization");
148 static int __elfN(pie_aslr_enabled) = 0;
149 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, pie_enable, CTLFLAG_RWTUN,
150 &__elfN(pie_aslr_enabled), 0,
151 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
152 ": enable address map randomization for PIE binaries");
154 static int __elfN(aslr_honor_sbrk) = 1;
155 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, honor_sbrk, CTLFLAG_RW,
156 &__elfN(aslr_honor_sbrk), 0,
157 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": assume sbrk is used");
159 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS];
161 #define aligned(a, t) (rounddown2((u_long)(a), sizeof(t)) == (u_long)(a))
163 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD";
165 Elf_Brandnote __elfN(freebsd_brandnote) = {
166 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR),
167 .hdr.n_descsz = sizeof(int32_t),
168 .hdr.n_type = NT_FREEBSD_ABI_TAG,
169 .vendor = FREEBSD_ABI_VENDOR,
170 .flags = BN_TRANSLATE_OSREL,
171 .trans_osrel = __elfN(freebsd_trans_osrel)
175 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel)
179 p = (uintptr_t)(note + 1);
180 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
181 *osrel = *(const int32_t *)(p);
186 static const char GNU_ABI_VENDOR[] = "GNU";
187 static int GNU_KFREEBSD_ABI_DESC = 3;
189 Elf_Brandnote __elfN(kfreebsd_brandnote) = {
190 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
191 .hdr.n_descsz = 16, /* XXX at least 16 */
193 .vendor = GNU_ABI_VENDOR,
194 .flags = BN_TRANSLATE_OSREL,
195 .trans_osrel = kfreebsd_trans_osrel
199 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel)
201 const Elf32_Word *desc;
204 p = (uintptr_t)(note + 1);
205 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
207 desc = (const Elf32_Word *)p;
208 if (desc[0] != GNU_KFREEBSD_ABI_DESC)
212 * Debian GNU/kFreeBSD embed the earliest compatible kernel version
213 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way.
215 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3];
221 __elfN(insert_brand_entry)(Elf_Brandinfo *entry)
225 for (i = 0; i < MAX_BRANDS; i++) {
226 if (elf_brand_list[i] == NULL) {
227 elf_brand_list[i] = entry;
231 if (i == MAX_BRANDS) {
232 printf("WARNING: %s: could not insert brandinfo entry: %p\n",
240 __elfN(remove_brand_entry)(Elf_Brandinfo *entry)
244 for (i = 0; i < MAX_BRANDS; i++) {
245 if (elf_brand_list[i] == entry) {
246 elf_brand_list[i] = NULL;
256 __elfN(brand_inuse)(Elf_Brandinfo *entry)
261 sx_slock(&allproc_lock);
262 FOREACH_PROC_IN_SYSTEM(p) {
263 if (p->p_sysent == entry->sysvec) {
268 sx_sunlock(&allproc_lock);
273 static Elf_Brandinfo *
274 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
275 int32_t *osrel, uint32_t *fctl0)
277 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
278 Elf_Brandinfo *bi, *bi_m;
280 int i, interp_name_len;
282 interp_name_len = interp != NULL ? strlen(interp) + 1 : 0;
285 * We support four types of branding -- (1) the ELF EI_OSABI field
286 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
287 * branding w/in the ELF header, (3) path of the `interp_path'
288 * field, and (4) the ".note.ABI-tag" ELF section.
291 /* Look for an ".note.ABI-tag" ELF section */
293 for (i = 0; i < MAX_BRANDS; i++) {
294 bi = elf_brand_list[i];
297 if (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)
299 if (hdr->e_machine == bi->machine && (bi->flags &
300 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
301 ret = __elfN(check_note)(imgp, bi->brand_note, osrel,
303 /* Give brand a chance to veto check_note's guess */
304 if (ret && bi->header_supported)
305 ret = bi->header_supported(imgp);
307 * If note checker claimed the binary, but the
308 * interpreter path in the image does not
309 * match default one for the brand, try to
310 * search for other brands with the same
311 * interpreter. Either there is better brand
312 * with the right interpreter, or, failing
313 * this, we return first brand which accepted
314 * our note and, optionally, header.
316 if (ret && bi_m == NULL && interp != NULL &&
317 (bi->interp_path == NULL ||
318 (strlen(bi->interp_path) + 1 != interp_name_len ||
319 strncmp(interp, bi->interp_path, interp_name_len)
331 /* If the executable has a brand, search for it in the brand list. */
332 for (i = 0; i < MAX_BRANDS; i++) {
333 bi = elf_brand_list[i];
334 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 ||
335 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0))
337 if (hdr->e_machine == bi->machine &&
338 (hdr->e_ident[EI_OSABI] == bi->brand ||
339 (bi->compat_3_brand != NULL &&
340 strcmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
341 bi->compat_3_brand) == 0))) {
342 /* Looks good, but give brand a chance to veto */
343 if (bi->header_supported == NULL ||
344 bi->header_supported(imgp)) {
346 * Again, prefer strictly matching
349 if (interp_name_len == 0 &&
350 bi->interp_path == NULL)
352 if (bi->interp_path != NULL &&
353 strlen(bi->interp_path) + 1 ==
354 interp_name_len && strncmp(interp,
355 bi->interp_path, interp_name_len) == 0)
365 /* No known brand, see if the header is recognized by any brand */
366 for (i = 0; i < MAX_BRANDS; i++) {
367 bi = elf_brand_list[i];
368 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY ||
369 bi->header_supported == NULL)
371 if (hdr->e_machine == bi->machine) {
372 ret = bi->header_supported(imgp);
378 /* Lacking a known brand, search for a recognized interpreter. */
379 if (interp != NULL) {
380 for (i = 0; i < MAX_BRANDS; i++) {
381 bi = elf_brand_list[i];
382 if (bi == NULL || (bi->flags &
383 (BI_BRAND_NOTE_MANDATORY | BI_BRAND_ONLY_STATIC))
386 if (hdr->e_machine == bi->machine &&
387 bi->interp_path != NULL &&
388 /* ELF image p_filesz includes terminating zero */
389 strlen(bi->interp_path) + 1 == interp_name_len &&
390 strncmp(interp, bi->interp_path, interp_name_len)
391 == 0 && (bi->header_supported == NULL ||
392 bi->header_supported(imgp)))
397 /* Lacking a recognized interpreter, try the default brand */
398 for (i = 0; i < MAX_BRANDS; i++) {
399 bi = elf_brand_list[i];
400 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 ||
401 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0))
403 if (hdr->e_machine == bi->machine &&
404 __elfN(fallback_brand) == bi->brand &&
405 (bi->header_supported == NULL ||
406 bi->header_supported(imgp)))
413 __elfN(check_header)(const Elf_Ehdr *hdr)
419 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
420 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
421 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
422 hdr->e_phentsize != sizeof(Elf_Phdr) ||
423 hdr->e_version != ELF_TARG_VER)
427 * Make sure we have at least one brand for this machine.
430 for (i = 0; i < MAX_BRANDS; i++) {
431 bi = elf_brand_list[i];
432 if (bi != NULL && bi->machine == hdr->e_machine)
442 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
443 vm_offset_t start, vm_offset_t end, vm_prot_t prot)
450 * Create the page if it doesn't exist yet. Ignore errors.
452 vm_map_fixed(map, NULL, 0, trunc_page(start), round_page(end) -
453 trunc_page(start), VM_PROT_ALL, VM_PROT_ALL, MAP_CHECK_EXCL);
456 * Find the page from the underlying object.
458 if (object != NULL) {
459 sf = vm_imgact_map_page(object, offset);
461 return (KERN_FAILURE);
462 off = offset - trunc_page(offset);
463 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start,
465 vm_imgact_unmap_page(sf);
467 return (KERN_FAILURE);
470 return (KERN_SUCCESS);
474 __elfN(map_insert)(struct image_params *imgp, vm_map_t map, vm_object_t object,
475 vm_ooffset_t offset, vm_offset_t start, vm_offset_t end, vm_prot_t prot,
481 int error, locked, rv;
483 if (start != trunc_page(start)) {
484 rv = __elfN(map_partial)(map, object, offset, start,
485 round_page(start), prot);
486 if (rv != KERN_SUCCESS)
488 offset += round_page(start) - start;
489 start = round_page(start);
491 if (end != round_page(end)) {
492 rv = __elfN(map_partial)(map, object, offset +
493 trunc_page(end) - start, trunc_page(end), end, prot);
494 if (rv != KERN_SUCCESS)
496 end = trunc_page(end);
499 return (KERN_SUCCESS);
500 if ((offset & PAGE_MASK) != 0) {
502 * The mapping is not page aligned. This means that we have
505 rv = vm_map_fixed(map, NULL, 0, start, end - start,
506 prot | VM_PROT_WRITE, VM_PROT_ALL, MAP_CHECK_EXCL);
507 if (rv != KERN_SUCCESS)
510 return (KERN_SUCCESS);
511 for (; start < end; start += sz) {
512 sf = vm_imgact_map_page(object, offset);
514 return (KERN_FAILURE);
515 off = offset - trunc_page(offset);
517 if (sz > PAGE_SIZE - off)
518 sz = PAGE_SIZE - off;
519 error = copyout((caddr_t)sf_buf_kva(sf) + off,
521 vm_imgact_unmap_page(sf);
523 return (KERN_FAILURE);
527 vm_object_reference(object);
528 rv = vm_map_fixed(map, object, offset, start, end - start,
529 prot, VM_PROT_ALL, cow | MAP_CHECK_EXCL);
530 if (rv != KERN_SUCCESS) {
531 locked = VOP_ISLOCKED(imgp->vp);
532 VOP_UNLOCK(imgp->vp, 0);
533 vm_object_deallocate(object);
534 vn_lock(imgp->vp, locked | LK_RETRY);
538 return (KERN_SUCCESS);
542 __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset,
543 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot)
549 vm_offset_t off, map_addr;
552 vm_ooffset_t file_addr;
555 * It's necessary to fail if the filsz + offset taken from the
556 * header is greater than the actual file pager object's size.
557 * If we were to allow this, then the vm_map_find() below would
558 * walk right off the end of the file object and into the ether.
560 * While I'm here, might as well check for something else that
561 * is invalid: filsz cannot be greater than memsz.
563 if ((filsz != 0 && (off_t)filsz + offset > imgp->attr->va_size) ||
565 uprintf("elf_load_section: truncated ELF file\n");
569 object = imgp->object;
570 map = &imgp->proc->p_vmspace->vm_map;
571 map_addr = trunc_page((vm_offset_t)vmaddr);
572 file_addr = trunc_page(offset);
575 * We have two choices. We can either clear the data in the last page
576 * of an oversized mapping, or we can start the anon mapping a page
577 * early and copy the initialized data into that first page. We
582 else if (memsz > filsz)
583 map_len = trunc_page(offset + filsz) - file_addr;
585 map_len = round_page(offset + filsz) - file_addr;
588 /* cow flags: don't dump readonly sections in core */
589 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
590 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
592 rv = __elfN(map_insert)(imgp, map,
594 file_addr, /* file offset */
595 map_addr, /* virtual start */
596 map_addr + map_len,/* virtual end */
599 if (rv != KERN_SUCCESS)
602 /* we can stop now if we've covered it all */
609 * We have to get the remaining bit of the file into the first part
610 * of the oversized map segment. This is normally because the .data
611 * segment in the file is extended to provide bss. It's a neat idea
612 * to try and save a page, but it's a pain in the behind to implement.
614 copy_len = filsz == 0 ? 0 : (offset + filsz) - trunc_page(offset +
616 map_addr = trunc_page((vm_offset_t)vmaddr + filsz);
617 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr;
619 /* This had damn well better be true! */
621 rv = __elfN(map_insert)(imgp, map, NULL, 0, map_addr,
622 map_addr + map_len, prot, 0);
623 if (rv != KERN_SUCCESS)
628 sf = vm_imgact_map_page(object, offset + filsz);
632 /* send the page fragment to user space */
633 off = trunc_page(offset + filsz) - trunc_page(offset + filsz);
634 error = copyout((caddr_t)sf_buf_kva(sf) + off,
635 (caddr_t)map_addr, copy_len);
636 vm_imgact_unmap_page(sf);
642 * Remove write access to the page if it was only granted by map_insert
645 if ((prot & VM_PROT_WRITE) == 0)
646 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr +
647 map_len), prot, FALSE);
653 __elfN(load_sections)(struct image_params *imgp, const Elf_Ehdr *hdr,
654 const Elf_Phdr *phdr, u_long rbase, u_long *base_addrp)
661 ASSERT_VOP_LOCKED(imgp->vp, __func__);
666 for (i = 0; i < hdr->e_phnum; i++) {
667 if (phdr[i].p_type != PT_LOAD || phdr[i].p_memsz == 0)
670 /* Loadable segment */
671 prot = __elfN(trans_prot)(phdr[i].p_flags);
672 error = __elfN(load_section)(imgp, phdr[i].p_offset,
673 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase,
674 phdr[i].p_memsz, phdr[i].p_filesz, prot);
679 * Establish the base address if this is the first segment.
682 base_addr = trunc_page(phdr[i].p_vaddr + rbase);
687 if (base_addrp != NULL)
688 *base_addrp = base_addr;
694 * Load the file "file" into memory. It may be either a shared object
697 * The "addr" reference parameter is in/out. On entry, it specifies
698 * the address where a shared object should be loaded. If the file is
699 * an executable, this value is ignored. On exit, "addr" specifies
700 * where the file was actually loaded.
702 * The "entry" reference parameter is out only. On exit, it specifies
703 * the entry point for the loaded file.
706 __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
712 struct image_params image_params;
714 const Elf_Ehdr *hdr = NULL;
715 const Elf_Phdr *phdr = NULL;
716 struct nameidata *nd;
718 struct image_params *imgp;
720 u_long base_addr = 0;
723 #ifdef CAPABILITY_MODE
725 * XXXJA: This check can go away once we are sufficiently confident
726 * that the checks in namei() are correct.
728 if (IN_CAPABILITY_MODE(curthread))
732 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
734 attr = &tempdata->attr;
735 imgp = &tempdata->image_params;
738 * Initialize part of the common data
742 imgp->firstpage = NULL;
743 imgp->image_header = NULL;
745 imgp->execlabel = NULL;
747 flags = FOLLOW | LOCKSHARED | LOCKLEAF;
750 NDINIT(nd, LOOKUP, flags, UIO_SYSSPACE, file, curthread);
751 if ((error = namei(nd)) != 0) {
755 NDFREE(nd, NDF_ONLY_PNBUF);
756 imgp->vp = nd->ni_vp;
759 * Check permissions, modes, uid, etc on the file, and "open" it.
761 error = exec_check_permissions(imgp);
766 * Also make certain that the interpreter stays the same,
767 * so set its VV_TEXT flag, too. Since this function is only
768 * used to load the interpreter, the VV_TEXT is almost always
771 if (VOP_IS_TEXT(nd->ni_vp) == 0) {
772 if (VOP_ISLOCKED(nd->ni_vp) != LK_EXCLUSIVE) {
774 * LK_UPGRADE could have resulted in dropping
775 * the lock. Just try again from the start,
776 * this time with exclusive vnode lock.
779 flags &= ~LOCKSHARED;
783 VOP_SET_TEXT(nd->ni_vp);
786 error = exec_map_first_page(imgp);
790 imgp->object = nd->ni_vp->v_object;
792 hdr = (const Elf_Ehdr *)imgp->image_header;
793 if ((error = __elfN(check_header)(hdr)) != 0)
795 if (hdr->e_type == ET_DYN)
797 else if (hdr->e_type == ET_EXEC)
804 /* Only support headers that fit within first page for now */
805 if ((hdr->e_phoff > PAGE_SIZE) ||
806 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
811 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
812 if (!aligned(phdr, Elf_Addr)) {
817 error = __elfN(load_sections)(imgp, hdr, phdr, rbase, &base_addr);
822 *entry = (unsigned long)hdr->e_entry + rbase;
826 exec_unmap_first_page(imgp);
831 free(tempdata, M_TEMP);
837 __CONCAT(rnd_, __elfN(base))(vm_map_t map __unused, u_long minv, u_long maxv,
842 MPASS(vm_map_min(map) <= minv);
843 MPASS(maxv <= vm_map_max(map));
845 MPASS(minv + align < maxv);
846 arc4rand(&rbase, sizeof(rbase), 0);
847 res = roundup(minv, (u_long)align) + rbase % (maxv - minv);
848 res &= ~((u_long)align - 1);
852 ("res %#lx < minv %#lx, maxv %#lx rbase %#lx",
853 res, minv, maxv, rbase));
855 ("res %#lx > maxv %#lx, minv %#lx rbase %#lx",
856 res, maxv, minv, rbase));
861 __elfN(enforce_limits)(struct image_params *imgp, const Elf_Ehdr *hdr,
862 const Elf_Phdr *phdr, u_long et_dyn_addr)
864 struct vmspace *vmspace;
866 u_long text_size, data_size, total_size, text_addr, data_addr;
867 u_long seg_size, seg_addr;
871 text_size = data_size = total_size = text_addr = data_addr = 0;
873 for (i = 0; i < hdr->e_phnum; i++) {
874 if (phdr[i].p_type != PT_LOAD || phdr[i].p_memsz == 0)
877 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
878 seg_size = round_page(phdr[i].p_memsz +
879 phdr[i].p_vaddr + et_dyn_addr - seg_addr);
882 * Make the largest executable segment the official
883 * text segment and all others data.
885 * Note that obreak() assumes that data_addr + data_size == end
886 * of data load area, and the ELF file format expects segments
887 * to be sorted by address. If multiple data segments exist,
888 * the last one will be used.
891 if ((phdr[i].p_flags & PF_X) != 0 && text_size < seg_size) {
892 text_size = seg_size;
893 text_addr = seg_addr;
895 data_size = seg_size;
896 data_addr = seg_addr;
898 total_size += seg_size;
901 if (data_addr == 0 && data_size == 0) {
902 data_addr = text_addr;
903 data_size = text_size;
907 * Check limits. It should be safe to check the
908 * limits after loading the segments since we do
909 * not actually fault in all the segments pages.
911 PROC_LOCK(imgp->proc);
912 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA))
913 err_str = "Data segment size exceeds process limit";
914 else if (text_size > maxtsiz)
915 err_str = "Text segment size exceeds system limit";
916 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM))
917 err_str = "Total segment size exceeds process limit";
918 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0)
919 err_str = "Data segment size exceeds resource limit";
920 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0)
921 err_str = "Total segment size exceeds resource limit";
922 PROC_UNLOCK(imgp->proc);
923 if (err_str != NULL) {
924 uprintf("%s\n", err_str);
928 vmspace = imgp->proc->p_vmspace;
929 vmspace->vm_tsize = text_size >> PAGE_SHIFT;
930 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
931 vmspace->vm_dsize = data_size >> PAGE_SHIFT;
932 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
938 __elfN(get_interp)(struct image_params *imgp, const Elf_Phdr *phdr,
939 char **interpp, bool *free_interpp)
943 int error, interp_name_len;
945 KASSERT(phdr->p_type == PT_INTERP,
946 ("%s: p_type %u != PT_INTERP", __func__, phdr->p_type));
947 ASSERT_VOP_LOCKED(imgp->vp, __func__);
951 /* Path to interpreter */
952 if (phdr->p_filesz < 2 || phdr->p_filesz > MAXPATHLEN) {
953 uprintf("Invalid PT_INTERP\n");
957 interp_name_len = phdr->p_filesz;
958 if (phdr->p_offset > PAGE_SIZE ||
959 interp_name_len > PAGE_SIZE - phdr->p_offset) {
960 VOP_UNLOCK(imgp->vp, 0);
961 interp = malloc(interp_name_len + 1, M_TEMP, M_WAITOK);
962 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
963 error = vn_rdwr(UIO_READ, imgp->vp, interp,
964 interp_name_len, phdr->p_offset,
965 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
968 free(interp, M_TEMP);
969 uprintf("i/o error PT_INTERP %d\n", error);
972 interp[interp_name_len] = '\0';
975 *free_interpp = true;
979 interp = __DECONST(char *, imgp->image_header) + phdr->p_offset;
980 if (interp[interp_name_len - 1] != '\0') {
981 uprintf("Invalid PT_INTERP\n");
986 *free_interpp = false;
991 __elfN(load_interp)(struct image_params *imgp, const Elf_Brandinfo *brand_info,
992 const char *interp, u_long *addr, u_long *entry)
997 if (brand_info->emul_path != NULL &&
998 brand_info->emul_path[0] != '\0') {
999 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1000 snprintf(path, MAXPATHLEN, "%s%s",
1001 brand_info->emul_path, interp);
1002 error = __elfN(load_file)(imgp->proc, path, addr, entry);
1008 if (brand_info->interp_newpath != NULL &&
1009 (brand_info->interp_path == NULL ||
1010 strcmp(interp, brand_info->interp_path) == 0)) {
1011 error = __elfN(load_file)(imgp->proc,
1012 brand_info->interp_newpath, addr, entry);
1017 error = __elfN(load_file)(imgp->proc, interp, addr, entry);
1021 uprintf("ELF interpreter %s not found, error %d\n", interp, error);
1026 * Impossible et_dyn_addr initial value indicating that the real base
1027 * must be calculated later with some randomization applied.
1029 #define ET_DYN_ADDR_RAND 1
1032 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
1035 const Elf_Ehdr *hdr;
1036 const Elf_Phdr *phdr;
1037 Elf_Auxargs *elf_auxargs;
1038 struct vmspace *vmspace;
1041 Elf_Brandinfo *brand_info;
1042 struct sysentvec *sv;
1043 u_long addr, baddr, et_dyn_addr, entry, proghdr;
1044 u_long maxalign, mapsz, maxv, maxv1;
1050 hdr = (const Elf_Ehdr *)imgp->image_header;
1053 * Do we have a valid ELF header ?
1055 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later
1056 * if particular brand doesn't support it.
1058 if (__elfN(check_header)(hdr) != 0 ||
1059 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
1063 * From here on down, we return an errno, not -1, as we've
1064 * detected an ELF file.
1067 if ((hdr->e_phoff > PAGE_SIZE) ||
1068 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
1069 /* Only support headers in first page for now */
1070 uprintf("Program headers not in the first page\n");
1073 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
1074 if (!aligned(phdr, Elf_Addr)) {
1075 uprintf("Unaligned program headers\n");
1083 entry = proghdr = 0;
1085 free_interp = false;
1087 maxalign = PAGE_SIZE;
1090 for (i = 0; i < hdr->e_phnum; i++) {
1091 switch (phdr[i].p_type) {
1094 baddr = phdr[i].p_vaddr;
1095 if (phdr[i].p_align > maxalign)
1096 maxalign = phdr[i].p_align;
1097 mapsz += phdr[i].p_memsz;
1101 * If this segment contains the program headers,
1102 * remember their virtual address for the AT_PHDR
1103 * aux entry. Static binaries don't usually include
1106 if (phdr[i].p_offset == 0 &&
1107 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize
1108 <= phdr[i].p_filesz)
1109 proghdr = phdr[i].p_vaddr + hdr->e_phoff;
1112 /* Path to interpreter */
1113 if (interp != NULL) {
1114 uprintf("Multiple PT_INTERP headers\n");
1118 error = __elfN(get_interp)(imgp, &phdr[i], &interp,
1124 if (__elfN(nxstack))
1126 __elfN(trans_prot)(phdr[i].p_flags);
1127 imgp->stack_sz = phdr[i].p_memsz;
1129 case PT_PHDR: /* Program header table info */
1130 proghdr = phdr[i].p_vaddr;
1135 brand_info = __elfN(get_brandinfo)(imgp, interp, &osrel, &fctl0);
1136 if (brand_info == NULL) {
1137 uprintf("ELF binary type \"%u\" not known.\n",
1138 hdr->e_ident[EI_OSABI]);
1142 sv = brand_info->sysvec;
1144 if (hdr->e_type == ET_DYN) {
1145 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) {
1146 uprintf("Cannot execute shared object\n");
1151 * Honour the base load address from the dso if it is
1152 * non-zero for some reason.
1155 if ((sv->sv_flags & SV_ASLR) == 0 ||
1156 (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0)
1157 et_dyn_addr = ET_DYN_LOAD_ADDR;
1158 else if ((__elfN(pie_aslr_enabled) &&
1159 (imgp->proc->p_flag2 & P2_ASLR_DISABLE) == 0) ||
1160 (imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0)
1161 et_dyn_addr = ET_DYN_ADDR_RAND;
1163 et_dyn_addr = ET_DYN_LOAD_ADDR;
1168 * Avoid a possible deadlock if the current address space is destroyed
1169 * and that address space maps the locked vnode. In the common case,
1170 * the locked vnode's v_usecount is decremented but remains greater
1171 * than zero. Consequently, the vnode lock is not needed by vrele().
1172 * However, in cases where the vnode lock is external, such as nullfs,
1173 * v_usecount may become zero.
1175 * The VV_TEXT flag prevents modifications to the executable while
1176 * the vnode is unlocked.
1178 VOP_UNLOCK(imgp->vp, 0);
1181 * Decide whether to enable randomization of user mappings.
1182 * First, reset user preferences for the setid binaries.
1183 * Then, account for the support of the randomization by the
1184 * ABI, by user preferences, and make special treatment for
1187 if (imgp->credential_setid) {
1188 PROC_LOCK(imgp->proc);
1189 imgp->proc->p_flag2 &= ~(P2_ASLR_ENABLE | P2_ASLR_DISABLE);
1190 PROC_UNLOCK(imgp->proc);
1192 if ((sv->sv_flags & SV_ASLR) == 0 ||
1193 (imgp->proc->p_flag2 & P2_ASLR_DISABLE) != 0 ||
1194 (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0) {
1195 KASSERT(et_dyn_addr != ET_DYN_ADDR_RAND,
1196 ("et_dyn_addr == RAND and !ASLR"));
1197 } else if ((imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0 ||
1198 (__elfN(aslr_enabled) && hdr->e_type == ET_EXEC) ||
1199 et_dyn_addr == ET_DYN_ADDR_RAND) {
1200 imgp->map_flags |= MAP_ASLR;
1202 * If user does not care about sbrk, utilize the bss
1203 * grow region for mappings as well. We can select
1204 * the base for the image anywere and still not suffer
1205 * from the fragmentation.
1207 if (!__elfN(aslr_honor_sbrk) ||
1208 (imgp->proc->p_flag2 & P2_ASLR_IGNSTART) != 0)
1209 imgp->map_flags |= MAP_ASLR_IGNSTART;
1212 error = exec_new_vmspace(imgp, sv);
1213 vmspace = imgp->proc->p_vmspace;
1214 map = &vmspace->vm_map;
1216 imgp->proc->p_sysent = sv;
1218 maxv = vm_map_max(map) - lim_max(td, RLIMIT_STACK);
1219 if (et_dyn_addr == ET_DYN_ADDR_RAND) {
1220 KASSERT((map->flags & MAP_ASLR) != 0,
1221 ("ET_DYN_ADDR_RAND but !MAP_ASLR"));
1222 et_dyn_addr = __CONCAT(rnd_, __elfN(base))(map,
1223 vm_map_min(map) + mapsz + lim_max(td, RLIMIT_DATA),
1224 /* reserve half of the address space to interpreter */
1225 maxv / 2, 1UL << flsl(maxalign));
1228 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
1232 error = __elfN(load_sections)(imgp, hdr, phdr, et_dyn_addr, NULL);
1236 error = __elfN(enforce_limits)(imgp, hdr, phdr, et_dyn_addr);
1240 entry = (u_long)hdr->e_entry + et_dyn_addr;
1243 * We load the dynamic linker where a userland call
1244 * to mmap(0, ...) would put it. The rationale behind this
1245 * calculation is that it leaves room for the heap to grow to
1246 * its maximum allowed size.
1248 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td,
1250 if ((map->flags & MAP_ASLR) != 0) {
1251 maxv1 = maxv / 2 + addr / 2;
1252 MPASS(maxv1 >= addr); /* No overflow */
1253 map->anon_loc = __CONCAT(rnd_, __elfN(base))(map, addr, maxv1,
1254 MAXPAGESIZES > 1 ? pagesizes[1] : pagesizes[0]);
1256 map->anon_loc = addr;
1259 imgp->entry_addr = entry;
1261 if (interp != NULL) {
1262 VOP_UNLOCK(imgp->vp, 0);
1263 if ((map->flags & MAP_ASLR) != 0) {
1264 /* Assume that interpeter fits into 1/4 of AS */
1265 maxv1 = maxv / 2 + addr / 2;
1266 MPASS(maxv1 >= addr); /* No overflow */
1267 addr = __CONCAT(rnd_, __elfN(base))(map, addr,
1270 error = __elfN(load_interp)(imgp, brand_info, interp, &addr,
1272 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
1279 * Construct auxargs table (used by the fixup routine)
1281 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
1282 elf_auxargs->execfd = -1;
1283 elf_auxargs->phdr = proghdr + et_dyn_addr;
1284 elf_auxargs->phent = hdr->e_phentsize;
1285 elf_auxargs->phnum = hdr->e_phnum;
1286 elf_auxargs->pagesz = PAGE_SIZE;
1287 elf_auxargs->base = addr;
1288 elf_auxargs->flags = 0;
1289 elf_auxargs->entry = entry;
1290 elf_auxargs->hdr_eflags = hdr->e_flags;
1292 imgp->auxargs = elf_auxargs;
1293 imgp->interpreted = 0;
1294 imgp->reloc_base = addr;
1295 imgp->proc->p_osrel = osrel;
1296 imgp->proc->p_fctl0 = fctl0;
1297 imgp->proc->p_elf_machine = hdr->e_machine;
1298 imgp->proc->p_elf_flags = hdr->e_flags;
1302 free(interp, M_TEMP);
1306 #define suword __CONCAT(suword, __ELF_WORD_SIZE)
1309 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp)
1311 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
1312 Elf_Auxinfo *argarray, *pos;
1313 Elf_Addr *base, *auxbase;
1316 base = (Elf_Addr *)*stack_base;
1317 auxbase = base + imgp->args->argc + 1 + imgp->args->envc + 1;
1318 argarray = pos = malloc(AT_COUNT * sizeof(*pos), M_TEMP,
1321 if (args->execfd != -1)
1322 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
1323 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
1324 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
1325 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
1326 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
1327 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
1328 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
1329 AUXARGS_ENTRY(pos, AT_BASE, args->base);
1330 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags);
1331 if (imgp->execpathp != 0)
1332 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp);
1333 AUXARGS_ENTRY(pos, AT_OSRELDATE,
1334 imgp->proc->p_ucred->cr_prison->pr_osreldate);
1335 if (imgp->canary != 0) {
1336 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary);
1337 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen);
1339 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus);
1340 if (imgp->pagesizes != 0) {
1341 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes);
1342 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen);
1344 if (imgp->sysent->sv_timekeep_base != 0) {
1345 AUXARGS_ENTRY(pos, AT_TIMEKEEP,
1346 imgp->sysent->sv_timekeep_base);
1348 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj
1349 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot :
1350 imgp->sysent->sv_stackprot);
1351 if (imgp->sysent->sv_hwcap != NULL)
1352 AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap);
1353 if (imgp->sysent->sv_hwcap2 != NULL)
1354 AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2);
1355 AUXARGS_ENTRY(pos, AT_NULL, 0);
1357 free(imgp->auxargs, M_TEMP);
1358 imgp->auxargs = NULL;
1359 KASSERT(pos - argarray <= AT_COUNT, ("Too many auxargs"));
1361 error = copyout(argarray, auxbase, sizeof(*argarray) * AT_COUNT);
1362 free(argarray, M_TEMP);
1367 if (suword(base, imgp->args->argc) == -1)
1369 *stack_base = (register_t *)base;
1374 * Code for generating ELF core dumps.
1377 typedef void (*segment_callback)(vm_map_entry_t, void *);
1379 /* Closure for cb_put_phdr(). */
1380 struct phdr_closure {
1381 Elf_Phdr *phdr; /* Program header to fill in */
1382 Elf_Off offset; /* Offset of segment in core file */
1385 /* Closure for cb_size_segment(). */
1386 struct sseg_closure {
1387 int count; /* Count of writable segments. */
1388 size_t size; /* Total size of all writable segments. */
1391 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *);
1394 int type; /* Note type. */
1395 outfunc_t outfunc; /* Output function. */
1396 void *outarg; /* Argument for the output function. */
1397 size_t outsize; /* Output size. */
1398 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */
1401 TAILQ_HEAD(note_info_list, note_info);
1403 /* Coredump output parameters. */
1404 struct coredump_params {
1406 struct ucred *active_cred;
1407 struct ucred *file_cred;
1410 struct compressor *comp;
1413 extern int compress_user_cores;
1414 extern int compress_user_cores_level;
1416 static void cb_put_phdr(vm_map_entry_t, void *);
1417 static void cb_size_segment(vm_map_entry_t, void *);
1418 static int core_write(struct coredump_params *, const void *, size_t, off_t,
1420 static void each_dumpable_segment(struct thread *, segment_callback, void *);
1421 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t,
1422 struct note_info_list *, size_t);
1423 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *,
1425 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t);
1426 static void __elfN(putnote)(struct note_info *, struct sbuf *);
1427 static size_t register_note(struct note_info_list *, int, outfunc_t, void *);
1428 static int sbuf_drain_core_output(void *, const char *, int);
1429 static int sbuf_drain_count(void *arg, const char *data, int len);
1431 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *);
1432 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *);
1433 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *);
1434 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *);
1435 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *);
1436 static void __elfN(note_ptlwpinfo)(void *, struct sbuf *, size_t *);
1437 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *);
1438 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *);
1439 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *);
1440 static void note_procstat_files(void *, struct sbuf *, size_t *);
1441 static void note_procstat_groups(void *, struct sbuf *, size_t *);
1442 static void note_procstat_osrel(void *, struct sbuf *, size_t *);
1443 static void note_procstat_rlimit(void *, struct sbuf *, size_t *);
1444 static void note_procstat_umask(void *, struct sbuf *, size_t *);
1445 static void note_procstat_vmmap(void *, struct sbuf *, size_t *);
1448 * Write out a core segment to the compression stream.
1451 compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len)
1457 chunk_len = MIN(len, CORE_BUF_SIZE);
1460 * We can get EFAULT error here.
1461 * In that case zero out the current chunk of the segment.
1463 error = copyin(base, buf, chunk_len);
1465 bzero(buf, chunk_len);
1466 error = compressor_write(p->comp, buf, chunk_len);
1476 core_compressed_write(void *base, size_t len, off_t offset, void *arg)
1479 return (core_write((struct coredump_params *)arg, base, len, offset,
1484 core_write(struct coredump_params *p, const void *base, size_t len,
1485 off_t offset, enum uio_seg seg)
1488 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, __DECONST(void *, base),
1489 len, offset, seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED,
1490 p->active_cred, p->file_cred, NULL, p->td));
1494 core_output(void *base, size_t len, off_t offset, struct coredump_params *p,
1499 if (p->comp != NULL)
1500 return (compress_chunk(p, base, tmpbuf, len));
1503 * EFAULT is a non-fatal error that we can get, for example,
1504 * if the segment is backed by a file but extends beyond its
1507 error = core_write(p, base, len, offset, UIO_USERSPACE);
1508 if (error == EFAULT) {
1509 log(LOG_WARNING, "Failed to fully fault in a core file segment "
1510 "at VA %p with size 0x%zx to be written at offset 0x%jx "
1511 "for process %s\n", base, len, offset, curproc->p_comm);
1514 * Write a "real" zero byte at the end of the target region
1515 * in the case this is the last segment.
1516 * The intermediate space will be implicitly zero-filled.
1518 error = core_write(p, zero_region, 1, offset + len - 1,
1525 * Drain into a core file.
1528 sbuf_drain_core_output(void *arg, const char *data, int len)
1530 struct coredump_params *p;
1533 p = (struct coredump_params *)arg;
1536 * Some kern_proc out routines that print to this sbuf may
1537 * call us with the process lock held. Draining with the
1538 * non-sleepable lock held is unsafe. The lock is needed for
1539 * those routines when dumping a live process. In our case we
1540 * can safely release the lock before draining and acquire
1543 locked = PROC_LOCKED(p->td->td_proc);
1545 PROC_UNLOCK(p->td->td_proc);
1546 if (p->comp != NULL)
1547 error = compressor_write(p->comp, __DECONST(char *, data), len);
1549 error = core_write(p, __DECONST(void *, data), len, p->offset,
1552 PROC_LOCK(p->td->td_proc);
1560 * Drain into a counter.
1563 sbuf_drain_count(void *arg, const char *data __unused, int len)
1567 sizep = (size_t *)arg;
1573 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags)
1575 struct ucred *cred = td->td_ucred;
1577 struct sseg_closure seginfo;
1578 struct note_info_list notelst;
1579 struct coredump_params params;
1580 struct note_info *ninfo;
1582 size_t hdrsize, notesz, coresize;
1586 TAILQ_INIT(¬elst);
1588 /* Size the program segments. */
1591 each_dumpable_segment(td, cb_size_segment, &seginfo);
1594 * Collect info about the core file header area.
1596 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count);
1597 if (seginfo.count + 1 >= PN_XNUM)
1598 hdrsize += sizeof(Elf_Shdr);
1599 __elfN(prepare_notes)(td, ¬elst, ¬esz);
1600 coresize = round_page(hdrsize + notesz) + seginfo.size;
1602 /* Set up core dump parameters. */
1604 params.active_cred = cred;
1605 params.file_cred = NOCRED;
1612 PROC_LOCK(td->td_proc);
1613 error = racct_add(td->td_proc, RACCT_CORE, coresize);
1614 PROC_UNLOCK(td->td_proc);
1621 if (coresize >= limit) {
1626 /* Create a compression stream if necessary. */
1627 if (compress_user_cores != 0) {
1628 params.comp = compressor_init(core_compressed_write,
1629 compress_user_cores, CORE_BUF_SIZE,
1630 compress_user_cores_level, ¶ms);
1631 if (params.comp == NULL) {
1635 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO);
1639 * Allocate memory for building the header, fill it up,
1640 * and write it out following the notes.
1642 hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
1643 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst,
1646 /* Write the contents of all of the writable segments. */
1652 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
1653 offset = round_page(hdrsize + notesz);
1654 for (i = 0; i < seginfo.count; i++) {
1655 error = core_output((caddr_t)(uintptr_t)php->p_vaddr,
1656 php->p_filesz, offset, ¶ms, tmpbuf);
1659 offset += php->p_filesz;
1662 if (error == 0 && params.comp != NULL)
1663 error = compressor_flush(params.comp);
1667 "Failed to write core file for process %s (error %d)\n",
1668 curproc->p_comm, error);
1672 free(tmpbuf, M_TEMP);
1673 if (params.comp != NULL)
1674 compressor_fini(params.comp);
1675 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) {
1676 TAILQ_REMOVE(¬elst, ninfo, link);
1677 free(ninfo, M_TEMP);
1686 * A callback for each_dumpable_segment() to write out the segment's
1687 * program header entry.
1690 cb_put_phdr(vm_map_entry_t entry, void *closure)
1692 struct phdr_closure *phc = (struct phdr_closure *)closure;
1693 Elf_Phdr *phdr = phc->phdr;
1695 phc->offset = round_page(phc->offset);
1697 phdr->p_type = PT_LOAD;
1698 phdr->p_offset = phc->offset;
1699 phdr->p_vaddr = entry->start;
1701 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1702 phdr->p_align = PAGE_SIZE;
1703 phdr->p_flags = __elfN(untrans_prot)(entry->protection);
1705 phc->offset += phdr->p_filesz;
1710 * A callback for each_dumpable_segment() to gather information about
1711 * the number of segments and their total size.
1714 cb_size_segment(vm_map_entry_t entry, void *closure)
1716 struct sseg_closure *ssc = (struct sseg_closure *)closure;
1719 ssc->size += entry->end - entry->start;
1723 * For each writable segment in the process's memory map, call the given
1724 * function with a pointer to the map entry and some arbitrary
1725 * caller-supplied data.
1728 each_dumpable_segment(struct thread *td, segment_callback func, void *closure)
1730 struct proc *p = td->td_proc;
1731 vm_map_t map = &p->p_vmspace->vm_map;
1732 vm_map_entry_t entry;
1733 vm_object_t backing_object, object;
1734 boolean_t ignore_entry;
1736 vm_map_lock_read(map);
1737 for (entry = map->header.next; entry != &map->header;
1738 entry = entry->next) {
1740 * Don't dump inaccessible mappings, deal with legacy
1743 * Note that read-only segments related to the elf binary
1744 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1745 * need to arbitrarily ignore such segments.
1747 if (elf_legacy_coredump) {
1748 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW)
1751 if ((entry->protection & VM_PROT_ALL) == 0)
1756 * Dont include memory segment in the coredump if
1757 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1758 * madvise(2). Do not dump submaps (i.e. parts of the
1761 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP))
1764 if ((object = entry->object.vm_object) == NULL)
1767 /* Ignore memory-mapped devices and such things. */
1768 VM_OBJECT_RLOCK(object);
1769 while ((backing_object = object->backing_object) != NULL) {
1770 VM_OBJECT_RLOCK(backing_object);
1771 VM_OBJECT_RUNLOCK(object);
1772 object = backing_object;
1774 ignore_entry = object->type != OBJT_DEFAULT &&
1775 object->type != OBJT_SWAP && object->type != OBJT_VNODE &&
1776 object->type != OBJT_PHYS;
1777 VM_OBJECT_RUNLOCK(object);
1781 (*func)(entry, closure);
1783 vm_map_unlock_read(map);
1787 * Write the core file header to the file, including padding up to
1788 * the page boundary.
1791 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr,
1792 size_t hdrsize, struct note_info_list *notelst, size_t notesz)
1794 struct note_info *ninfo;
1798 /* Fill in the header. */
1799 bzero(hdr, hdrsize);
1800 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz);
1802 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN);
1803 sbuf_set_drain(sb, sbuf_drain_core_output, p);
1804 sbuf_start_section(sb, NULL);
1805 sbuf_bcat(sb, hdr, hdrsize);
1806 TAILQ_FOREACH(ninfo, notelst, link)
1807 __elfN(putnote)(ninfo, sb);
1808 /* Align up to a page boundary for the program segments. */
1809 sbuf_end_section(sb, -1, PAGE_SIZE, 0);
1810 error = sbuf_finish(sb);
1817 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list,
1827 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p);
1830 * To have the debugger select the right thread (LWP) as the initial
1831 * thread, we dump the state of the thread passed to us in td first.
1832 * This is the thread that causes the core dump and thus likely to
1833 * be the right thread one wants to have selected in the debugger.
1836 while (thr != NULL) {
1837 size += register_note(list, NT_PRSTATUS,
1838 __elfN(note_prstatus), thr);
1839 size += register_note(list, NT_FPREGSET,
1840 __elfN(note_fpregset), thr);
1841 size += register_note(list, NT_THRMISC,
1842 __elfN(note_thrmisc), thr);
1843 size += register_note(list, NT_PTLWPINFO,
1844 __elfN(note_ptlwpinfo), thr);
1845 size += register_note(list, -1,
1846 __elfN(note_threadmd), thr);
1848 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) :
1849 TAILQ_NEXT(thr, td_plist);
1851 thr = TAILQ_NEXT(thr, td_plist);
1854 size += register_note(list, NT_PROCSTAT_PROC,
1855 __elfN(note_procstat_proc), p);
1856 size += register_note(list, NT_PROCSTAT_FILES,
1857 note_procstat_files, p);
1858 size += register_note(list, NT_PROCSTAT_VMMAP,
1859 note_procstat_vmmap, p);
1860 size += register_note(list, NT_PROCSTAT_GROUPS,
1861 note_procstat_groups, p);
1862 size += register_note(list, NT_PROCSTAT_UMASK,
1863 note_procstat_umask, p);
1864 size += register_note(list, NT_PROCSTAT_RLIMIT,
1865 note_procstat_rlimit, p);
1866 size += register_note(list, NT_PROCSTAT_OSREL,
1867 note_procstat_osrel, p);
1868 size += register_note(list, NT_PROCSTAT_PSSTRINGS,
1869 __elfN(note_procstat_psstrings), p);
1870 size += register_note(list, NT_PROCSTAT_AUXV,
1871 __elfN(note_procstat_auxv), p);
1877 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs,
1883 struct phdr_closure phc;
1885 ehdr = (Elf_Ehdr *)hdr;
1887 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1888 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1889 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1890 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1891 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1892 ehdr->e_ident[EI_DATA] = ELF_DATA;
1893 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1894 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
1895 ehdr->e_ident[EI_ABIVERSION] = 0;
1896 ehdr->e_ident[EI_PAD] = 0;
1897 ehdr->e_type = ET_CORE;
1898 ehdr->e_machine = td->td_proc->p_elf_machine;
1899 ehdr->e_version = EV_CURRENT;
1901 ehdr->e_phoff = sizeof(Elf_Ehdr);
1902 ehdr->e_flags = td->td_proc->p_elf_flags;
1903 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1904 ehdr->e_phentsize = sizeof(Elf_Phdr);
1905 ehdr->e_shentsize = sizeof(Elf_Shdr);
1906 ehdr->e_shstrndx = SHN_UNDEF;
1907 if (numsegs + 1 < PN_XNUM) {
1908 ehdr->e_phnum = numsegs + 1;
1911 ehdr->e_phnum = PN_XNUM;
1914 ehdr->e_shoff = ehdr->e_phoff +
1915 (numsegs + 1) * ehdr->e_phentsize;
1916 KASSERT(ehdr->e_shoff == hdrsize - sizeof(Elf_Shdr),
1917 ("e_shoff: %zu, hdrsize - shdr: %zu",
1918 (size_t)ehdr->e_shoff, hdrsize - sizeof(Elf_Shdr)));
1920 shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff);
1921 memset(shdr, 0, sizeof(*shdr));
1923 * A special first section is used to hold large segment and
1924 * section counts. This was proposed by Sun Microsystems in
1925 * Solaris and has been adopted by Linux; the standard ELF
1926 * tools are already familiar with the technique.
1928 * See table 7-7 of the Solaris "Linker and Libraries Guide"
1929 * (or 12-7 depending on the version of the document) for more
1932 shdr->sh_type = SHT_NULL;
1933 shdr->sh_size = ehdr->e_shnum;
1934 shdr->sh_link = ehdr->e_shstrndx;
1935 shdr->sh_info = numsegs + 1;
1939 * Fill in the program header entries.
1941 phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff);
1943 /* The note segement. */
1944 phdr->p_type = PT_NOTE;
1945 phdr->p_offset = hdrsize;
1948 phdr->p_filesz = notesz;
1950 phdr->p_flags = PF_R;
1951 phdr->p_align = ELF_NOTE_ROUNDSIZE;
1954 /* All the writable segments from the program. */
1956 phc.offset = round_page(hdrsize + notesz);
1957 each_dumpable_segment(td, cb_put_phdr, &phc);
1961 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg)
1963 struct note_info *ninfo;
1964 size_t size, notesize;
1967 out(arg, NULL, &size);
1968 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK);
1970 ninfo->outfunc = out;
1971 ninfo->outarg = arg;
1972 ninfo->outsize = size;
1973 TAILQ_INSERT_TAIL(list, ninfo, link);
1978 notesize = sizeof(Elf_Note) + /* note header */
1979 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
1981 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
1987 append_note_data(const void *src, void *dst, size_t len)
1991 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE);
1993 bcopy(src, dst, len);
1994 bzero((char *)dst + len, padded_len - len);
1996 return (padded_len);
2000 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp)
2008 note = (Elf_Note *)buf;
2009 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR);
2010 note->n_descsz = size;
2011 note->n_type = type;
2012 buf += sizeof(*note);
2013 buf += append_note_data(FREEBSD_ABI_VENDOR, buf,
2014 sizeof(FREEBSD_ABI_VENDOR));
2015 append_note_data(src, buf, size);
2020 notesize = sizeof(Elf_Note) + /* note header */
2021 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
2023 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
2029 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb)
2032 ssize_t old_len, sect_len;
2033 size_t new_len, descsz, i;
2035 if (ninfo->type == -1) {
2036 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
2040 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR);
2041 note.n_descsz = ninfo->outsize;
2042 note.n_type = ninfo->type;
2044 sbuf_bcat(sb, ¬e, sizeof(note));
2045 sbuf_start_section(sb, &old_len);
2046 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR));
2047 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
2048 if (note.n_descsz == 0)
2050 sbuf_start_section(sb, &old_len);
2051 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
2052 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
2056 new_len = (size_t)sect_len;
2057 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE);
2058 if (new_len < descsz) {
2060 * It is expected that individual note emitters will correctly
2061 * predict their expected output size and fill up to that size
2062 * themselves, padding in a format-specific way if needed.
2063 * However, in case they don't, just do it here with zeros.
2065 for (i = 0; i < descsz - new_len; i++)
2067 } else if (new_len > descsz) {
2069 * We can't always truncate sb -- we may have drained some
2072 KASSERT(new_len == descsz, ("%s: Note type %u changed as we "
2073 "read it (%zu > %zu). Since it is longer than "
2074 "expected, this coredump's notes are corrupt. THIS "
2075 "IS A BUG in the note_procstat routine for type %u.\n",
2076 __func__, (unsigned)note.n_type, new_len, descsz,
2077 (unsigned)note.n_type));
2082 * Miscellaneous note out functions.
2085 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2086 #include <compat/freebsd32/freebsd32.h>
2087 #include <compat/freebsd32/freebsd32_signal.h>
2089 typedef struct prstatus32 elf_prstatus_t;
2090 typedef struct prpsinfo32 elf_prpsinfo_t;
2091 typedef struct fpreg32 elf_prfpregset_t;
2092 typedef struct fpreg32 elf_fpregset_t;
2093 typedef struct reg32 elf_gregset_t;
2094 typedef struct thrmisc32 elf_thrmisc_t;
2095 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32
2096 typedef struct kinfo_proc32 elf_kinfo_proc_t;
2097 typedef uint32_t elf_ps_strings_t;
2099 typedef prstatus_t elf_prstatus_t;
2100 typedef prpsinfo_t elf_prpsinfo_t;
2101 typedef prfpregset_t elf_prfpregset_t;
2102 typedef prfpregset_t elf_fpregset_t;
2103 typedef gregset_t elf_gregset_t;
2104 typedef thrmisc_t elf_thrmisc_t;
2105 #define ELF_KERN_PROC_MASK 0
2106 typedef struct kinfo_proc elf_kinfo_proc_t;
2107 typedef vm_offset_t elf_ps_strings_t;
2111 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep)
2117 elf_prpsinfo_t *psinfo;
2120 p = (struct proc *)arg;
2122 KASSERT(*sizep == sizeof(*psinfo), ("invalid size"));
2123 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK);
2124 psinfo->pr_version = PRPSINFO_VERSION;
2125 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t);
2126 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
2128 if (p->p_args != NULL) {
2129 len = sizeof(psinfo->pr_psargs) - 1;
2130 if (len > p->p_args->ar_length)
2131 len = p->p_args->ar_length;
2132 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len);
2138 sbuf_new(&sbarg, psinfo->pr_psargs,
2139 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN);
2140 error = proc_getargv(curthread, p, &sbarg);
2142 if (sbuf_finish(&sbarg) == 0)
2143 len = sbuf_len(&sbarg) - 1;
2145 len = sizeof(psinfo->pr_psargs) - 1;
2146 sbuf_delete(&sbarg);
2148 if (error || len == 0)
2149 strlcpy(psinfo->pr_psargs, p->p_comm,
2150 sizeof(psinfo->pr_psargs));
2152 KASSERT(len < sizeof(psinfo->pr_psargs),
2153 ("len is too long: %zu vs %zu", len,
2154 sizeof(psinfo->pr_psargs)));
2155 cp = psinfo->pr_psargs;
2158 cp = memchr(cp, '\0', end - cp);
2164 psinfo->pr_pid = p->p_pid;
2165 sbuf_bcat(sb, psinfo, sizeof(*psinfo));
2166 free(psinfo, M_TEMP);
2168 *sizep = sizeof(*psinfo);
2172 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep)
2175 elf_prstatus_t *status;
2177 td = (struct thread *)arg;
2179 KASSERT(*sizep == sizeof(*status), ("invalid size"));
2180 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK);
2181 status->pr_version = PRSTATUS_VERSION;
2182 status->pr_statussz = sizeof(elf_prstatus_t);
2183 status->pr_gregsetsz = sizeof(elf_gregset_t);
2184 status->pr_fpregsetsz = sizeof(elf_fpregset_t);
2185 status->pr_osreldate = osreldate;
2186 status->pr_cursig = td->td_proc->p_sig;
2187 status->pr_pid = td->td_tid;
2188 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2189 fill_regs32(td, &status->pr_reg);
2191 fill_regs(td, &status->pr_reg);
2193 sbuf_bcat(sb, status, sizeof(*status));
2194 free(status, M_TEMP);
2196 *sizep = sizeof(*status);
2200 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep)
2203 elf_prfpregset_t *fpregset;
2205 td = (struct thread *)arg;
2207 KASSERT(*sizep == sizeof(*fpregset), ("invalid size"));
2208 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK);
2209 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2210 fill_fpregs32(td, fpregset);
2212 fill_fpregs(td, fpregset);
2214 sbuf_bcat(sb, fpregset, sizeof(*fpregset));
2215 free(fpregset, M_TEMP);
2217 *sizep = sizeof(*fpregset);
2221 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep)
2224 elf_thrmisc_t thrmisc;
2226 td = (struct thread *)arg;
2228 KASSERT(*sizep == sizeof(thrmisc), ("invalid size"));
2229 bzero(&thrmisc._pad, sizeof(thrmisc._pad));
2230 strcpy(thrmisc.pr_tname, td->td_name);
2231 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc));
2233 *sizep = sizeof(thrmisc);
2237 __elfN(note_ptlwpinfo)(void *arg, struct sbuf *sb, size_t *sizep)
2242 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2243 struct ptrace_lwpinfo32 pl;
2245 struct ptrace_lwpinfo pl;
2248 td = (struct thread *)arg;
2249 size = sizeof(structsize) + sizeof(pl);
2251 KASSERT(*sizep == size, ("invalid size"));
2252 structsize = sizeof(pl);
2253 sbuf_bcat(sb, &structsize, sizeof(structsize));
2254 bzero(&pl, sizeof(pl));
2255 pl.pl_lwpid = td->td_tid;
2256 pl.pl_event = PL_EVENT_NONE;
2257 pl.pl_sigmask = td->td_sigmask;
2258 pl.pl_siglist = td->td_siglist;
2259 if (td->td_si.si_signo != 0) {
2260 pl.pl_event = PL_EVENT_SIGNAL;
2261 pl.pl_flags |= PL_FLAG_SI;
2262 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2263 siginfo_to_siginfo32(&td->td_si, &pl.pl_siginfo);
2265 pl.pl_siginfo = td->td_si;
2268 strcpy(pl.pl_tdname, td->td_name);
2269 /* XXX TODO: supply more information in struct ptrace_lwpinfo*/
2270 sbuf_bcat(sb, &pl, sizeof(pl));
2276 * Allow for MD specific notes, as well as any MD
2277 * specific preparations for writing MI notes.
2280 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep)
2286 td = (struct thread *)arg;
2288 if (size != 0 && sb != NULL)
2289 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK);
2293 __elfN(dump_thread)(td, buf, &size);
2294 KASSERT(sb == NULL || *sizep == size, ("invalid size"));
2295 if (size != 0 && sb != NULL)
2296 sbuf_bcat(sb, buf, size);
2301 #ifdef KINFO_PROC_SIZE
2302 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
2306 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep)
2312 p = (struct proc *)arg;
2313 size = sizeof(structsize) + p->p_numthreads *
2314 sizeof(elf_kinfo_proc_t);
2317 KASSERT(*sizep == size, ("invalid size"));
2318 structsize = sizeof(elf_kinfo_proc_t);
2319 sbuf_bcat(sb, &structsize, sizeof(structsize));
2321 kern_proc_out(p, sb, ELF_KERN_PROC_MASK);
2326 #ifdef KINFO_FILE_SIZE
2327 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE);
2331 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep)
2334 size_t size, sect_sz, i;
2335 ssize_t start_len, sect_len;
2336 int structsize, filedesc_flags;
2338 if (coredump_pack_fileinfo)
2339 filedesc_flags = KERN_FILEDESC_PACK_KINFO;
2343 p = (struct proc *)arg;
2344 structsize = sizeof(struct kinfo_file);
2347 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2348 sbuf_set_drain(sb, sbuf_drain_count, &size);
2349 sbuf_bcat(sb, &structsize, sizeof(structsize));
2351 kern_proc_filedesc_out(p, sb, -1, filedesc_flags);
2356 sbuf_start_section(sb, &start_len);
2358 sbuf_bcat(sb, &structsize, sizeof(structsize));
2360 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize),
2363 sect_len = sbuf_end_section(sb, start_len, 0, 0);
2368 KASSERT(sect_sz <= *sizep,
2369 ("kern_proc_filedesc_out did not respect maxlen; "
2370 "requested %zu, got %zu", *sizep - sizeof(structsize),
2371 sect_sz - sizeof(structsize)));
2373 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++)
2378 #ifdef KINFO_VMENTRY_SIZE
2379 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE);
2383 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep)
2387 int structsize, vmmap_flags;
2389 if (coredump_pack_vmmapinfo)
2390 vmmap_flags = KERN_VMMAP_PACK_KINFO;
2394 p = (struct proc *)arg;
2395 structsize = sizeof(struct kinfo_vmentry);
2398 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2399 sbuf_set_drain(sb, sbuf_drain_count, &size);
2400 sbuf_bcat(sb, &structsize, sizeof(structsize));
2402 kern_proc_vmmap_out(p, sb, -1, vmmap_flags);
2407 sbuf_bcat(sb, &structsize, sizeof(structsize));
2409 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize),
2415 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep)
2421 p = (struct proc *)arg;
2422 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t);
2424 KASSERT(*sizep == size, ("invalid size"));
2425 structsize = sizeof(gid_t);
2426 sbuf_bcat(sb, &structsize, sizeof(structsize));
2427 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups *
2434 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep)
2440 p = (struct proc *)arg;
2441 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask);
2443 KASSERT(*sizep == size, ("invalid size"));
2444 structsize = sizeof(p->p_fd->fd_cmask);
2445 sbuf_bcat(sb, &structsize, sizeof(structsize));
2446 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask));
2452 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep)
2455 struct rlimit rlim[RLIM_NLIMITS];
2459 p = (struct proc *)arg;
2460 size = sizeof(structsize) + sizeof(rlim);
2462 KASSERT(*sizep == size, ("invalid size"));
2463 structsize = sizeof(rlim);
2464 sbuf_bcat(sb, &structsize, sizeof(structsize));
2466 for (i = 0; i < RLIM_NLIMITS; i++)
2467 lim_rlimit_proc(p, i, &rlim[i]);
2469 sbuf_bcat(sb, rlim, sizeof(rlim));
2475 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep)
2481 p = (struct proc *)arg;
2482 size = sizeof(structsize) + sizeof(p->p_osrel);
2484 KASSERT(*sizep == size, ("invalid size"));
2485 structsize = sizeof(p->p_osrel);
2486 sbuf_bcat(sb, &structsize, sizeof(structsize));
2487 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel));
2493 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep)
2496 elf_ps_strings_t ps_strings;
2500 p = (struct proc *)arg;
2501 size = sizeof(structsize) + sizeof(ps_strings);
2503 KASSERT(*sizep == size, ("invalid size"));
2504 structsize = sizeof(ps_strings);
2505 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2506 ps_strings = PTROUT(p->p_sysent->sv_psstrings);
2508 ps_strings = p->p_sysent->sv_psstrings;
2510 sbuf_bcat(sb, &structsize, sizeof(structsize));
2511 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings));
2517 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep)
2523 p = (struct proc *)arg;
2526 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2527 sbuf_set_drain(sb, sbuf_drain_count, &size);
2528 sbuf_bcat(sb, &structsize, sizeof(structsize));
2530 proc_getauxv(curthread, p, sb);
2536 structsize = sizeof(Elf_Auxinfo);
2537 sbuf_bcat(sb, &structsize, sizeof(structsize));
2539 proc_getauxv(curthread, p, sb);
2545 __elfN(parse_notes)(struct image_params *imgp, Elf_Note *checknote,
2546 const char *note_vendor, const Elf_Phdr *pnote,
2547 boolean_t (*cb)(const Elf_Note *, void *, boolean_t *), void *cb_arg)
2549 const Elf_Note *note, *note0, *note_end;
2550 const char *note_name;
2555 /* We need some limit, might as well use PAGE_SIZE. */
2556 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE)
2558 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes");
2559 if (pnote->p_offset > PAGE_SIZE ||
2560 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) {
2561 VOP_UNLOCK(imgp->vp, 0);
2562 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK);
2563 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
2564 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz,
2565 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED,
2566 curthread->td_ucred, NOCRED, NULL, curthread);
2568 uprintf("i/o error PT_NOTE\n");
2571 note = note0 = (const Elf_Note *)buf;
2572 note_end = (const Elf_Note *)(buf + pnote->p_filesz);
2574 note = note0 = (const Elf_Note *)(imgp->image_header +
2576 note_end = (const Elf_Note *)(imgp->image_header +
2577 pnote->p_offset + pnote->p_filesz);
2580 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) {
2581 if (!aligned(note, Elf32_Addr) || (const char *)note_end -
2582 (const char *)note < sizeof(Elf_Note)) {
2585 if (note->n_namesz != checknote->n_namesz ||
2586 note->n_descsz != checknote->n_descsz ||
2587 note->n_type != checknote->n_type)
2589 note_name = (const char *)(note + 1);
2590 if (note_name + checknote->n_namesz >=
2591 (const char *)note_end || strncmp(note_vendor,
2592 note_name, checknote->n_namesz) != 0)
2595 if (cb(note, cb_arg, &res))
2598 note = (const Elf_Note *)((const char *)(note + 1) +
2599 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) +
2600 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE));
2609 struct brandnote_cb_arg {
2610 Elf_Brandnote *brandnote;
2615 brandnote_cb(const Elf_Note *note, void *arg0, boolean_t *res)
2617 struct brandnote_cb_arg *arg;
2622 * Fetch the osreldate for binary from the ELF OSABI-note if
2625 *res = (arg->brandnote->flags & BN_TRANSLATE_OSREL) != 0 &&
2626 arg->brandnote->trans_osrel != NULL ?
2627 arg->brandnote->trans_osrel(note, arg->osrel) : TRUE;
2632 static Elf_Note fctl_note = {
2633 .n_namesz = sizeof(FREEBSD_ABI_VENDOR),
2634 .n_descsz = sizeof(uint32_t),
2635 .n_type = NT_FREEBSD_FEATURE_CTL,
2638 struct fctl_cb_arg {
2643 note_fctl_cb(const Elf_Note *note, void *arg0, boolean_t *res)
2645 struct fctl_cb_arg *arg;
2646 const Elf32_Word *desc;
2650 p = (uintptr_t)(note + 1);
2651 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
2652 desc = (const Elf32_Word *)p;
2653 *arg->fctl0 = desc[0];
2658 * Try to find the appropriate ABI-note section for checknote, fetch
2659 * the osreldate and feature control flags for binary from the ELF
2660 * OSABI-note. Only the first page of the image is searched, the same
2664 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *brandnote,
2665 int32_t *osrel, uint32_t *fctl0)
2667 const Elf_Phdr *phdr;
2668 const Elf_Ehdr *hdr;
2669 struct brandnote_cb_arg b_arg;
2670 struct fctl_cb_arg f_arg;
2673 hdr = (const Elf_Ehdr *)imgp->image_header;
2674 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
2675 b_arg.brandnote = brandnote;
2676 b_arg.osrel = osrel;
2677 f_arg.fctl0 = fctl0;
2679 for (i = 0; i < hdr->e_phnum; i++) {
2680 if (phdr[i].p_type == PT_NOTE && __elfN(parse_notes)(imgp,
2681 &brandnote->hdr, brandnote->vendor, &phdr[i], brandnote_cb,
2683 for (j = 0; j < hdr->e_phnum; j++) {
2684 if (phdr[j].p_type == PT_NOTE &&
2685 __elfN(parse_notes)(imgp, &fctl_note,
2686 FREEBSD_ABI_VENDOR, &phdr[j],
2687 note_fctl_cb, &f_arg))
2698 * Tell kern_execve.c about it, with a little help from the linker.
2700 static struct execsw __elfN(execsw) = {
2701 .ex_imgact = __CONCAT(exec_, __elfN(imgact)),
2702 .ex_name = __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
2704 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
2707 __elfN(trans_prot)(Elf_Word flags)
2713 prot |= VM_PROT_EXECUTE;
2715 prot |= VM_PROT_WRITE;
2717 prot |= VM_PROT_READ;
2718 #if __ELF_WORD_SIZE == 32 && (defined(__amd64__) || defined(__i386__))
2719 if (i386_read_exec && (flags & PF_R))
2720 prot |= VM_PROT_EXECUTE;
2726 __elfN(untrans_prot)(vm_prot_t prot)
2731 if (prot & VM_PROT_EXECUTE)
2733 if (prot & VM_PROT_READ)
2735 if (prot & VM_PROT_WRITE)