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>
54 #include <sys/procfs.h>
55 #include <sys/ptrace.h>
56 #include <sys/racct.h>
57 #include <sys/resourcevar.h>
58 #include <sys/rwlock.h>
60 #include <sys/sf_buf.h>
62 #include <sys/systm.h>
63 #include <sys/signalvar.h>
66 #include <sys/syscall.h>
67 #include <sys/sysctl.h>
68 #include <sys/sysent.h>
69 #include <sys/vnode.h>
70 #include <sys/syslog.h>
71 #include <sys/eventhandler.h>
75 #include <vm/vm_kern.h>
76 #include <vm/vm_param.h>
78 #include <vm/vm_map.h>
79 #include <vm/vm_object.h>
80 #include <vm/vm_extern.h>
82 #include <machine/elf.h>
83 #include <machine/md_var.h>
85 #define ELF_NOTE_ROUNDSIZE 4
86 #define OLD_EI_BRAND 8
88 static int __elfN(check_header)(const Elf_Ehdr *hdr);
89 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp,
90 const char *interp, int32_t *osrel, uint32_t *fctl0);
91 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
93 static int __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset,
94 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot);
95 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp);
96 static bool __elfN(freebsd_trans_osrel)(const Elf_Note *note,
98 static bool kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel);
99 static boolean_t __elfN(check_note)(struct image_params *imgp,
100 Elf_Brandnote *checknote, int32_t *osrel, boolean_t *has_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),
106 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
109 #define CORE_BUF_SIZE (16 * 1024)
111 int __elfN(fallback_brand) = -1;
112 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
113 fallback_brand, CTLFLAG_RWTUN, &__elfN(fallback_brand), 0,
114 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort");
116 static int elf_legacy_coredump = 0;
117 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW,
118 &elf_legacy_coredump, 0,
119 "include all and only RW pages in core dumps");
121 int __elfN(nxstack) =
122 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */ || \
123 (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__) || \
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 && (defined(__amd64__) || defined(__i386__))
134 int i386_read_exec = 0;
135 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0,
136 "enable execution from readable segments");
139 static u_long __elfN(pie_base) = ET_DYN_LOAD_ADDR;
141 sysctl_pie_base(SYSCTL_HANDLER_ARGS)
146 val = __elfN(pie_base);
147 error = sysctl_handle_long(oidp, &val, 0, req);
148 if (error != 0 || req->newptr == NULL)
150 if ((val & PAGE_MASK) != 0)
152 __elfN(pie_base) = val;
155 SYSCTL_PROC(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, pie_base,
156 CTLTYPE_ULONG | CTLFLAG_MPSAFE | CTLFLAG_RW, NULL, 0,
157 sysctl_pie_base, "LU",
158 "PIE load base without randomization");
160 SYSCTL_NODE(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, aslr,
161 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
163 #define ASLR_NODE_OID __CONCAT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), _aslr)
165 static int __elfN(aslr_enabled) = 0;
166 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, enable, CTLFLAG_RWTUN,
167 &__elfN(aslr_enabled), 0,
168 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
169 ": enable address map randomization");
171 static int __elfN(pie_aslr_enabled) = 0;
172 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, pie_enable, CTLFLAG_RWTUN,
173 &__elfN(pie_aslr_enabled), 0,
174 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
175 ": enable address map randomization for PIE binaries");
177 static int __elfN(aslr_honor_sbrk) = 1;
178 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, honor_sbrk, CTLFLAG_RW,
179 &__elfN(aslr_honor_sbrk), 0,
180 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": assume sbrk is used");
182 static int __elfN(aslr_stack_gap) = 3;
183 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, stack_gap, CTLFLAG_RW,
184 &__elfN(aslr_stack_gap), 0,
185 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
186 ": maximum percentage of main stack to waste on a random gap");
188 static int __elfN(sigfastblock) = 1;
189 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, sigfastblock,
190 CTLFLAG_RWTUN, &__elfN(sigfastblock), 0,
191 "enable sigfastblock for new processes");
193 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS];
195 #define aligned(a, t) (rounddown2((u_long)(a), sizeof(t)) == (u_long)(a))
197 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD";
199 Elf_Brandnote __elfN(freebsd_brandnote) = {
200 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR),
201 .hdr.n_descsz = sizeof(int32_t),
202 .hdr.n_type = NT_FREEBSD_ABI_TAG,
203 .vendor = FREEBSD_ABI_VENDOR,
204 .flags = BN_TRANSLATE_OSREL,
205 .trans_osrel = __elfN(freebsd_trans_osrel)
209 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel)
213 p = (uintptr_t)(note + 1);
214 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
215 *osrel = *(const int32_t *)(p);
220 static const char GNU_ABI_VENDOR[] = "GNU";
221 static int GNU_KFREEBSD_ABI_DESC = 3;
223 Elf_Brandnote __elfN(kfreebsd_brandnote) = {
224 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
225 .hdr.n_descsz = 16, /* XXX at least 16 */
227 .vendor = GNU_ABI_VENDOR,
228 .flags = BN_TRANSLATE_OSREL,
229 .trans_osrel = kfreebsd_trans_osrel
233 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel)
235 const Elf32_Word *desc;
238 p = (uintptr_t)(note + 1);
239 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
241 desc = (const Elf32_Word *)p;
242 if (desc[0] != GNU_KFREEBSD_ABI_DESC)
246 * Debian GNU/kFreeBSD embed the earliest compatible kernel version
247 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way.
249 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3];
255 __elfN(insert_brand_entry)(Elf_Brandinfo *entry)
259 for (i = 0; i < MAX_BRANDS; i++) {
260 if (elf_brand_list[i] == NULL) {
261 elf_brand_list[i] = entry;
265 if (i == MAX_BRANDS) {
266 printf("WARNING: %s: could not insert brandinfo entry: %p\n",
274 __elfN(remove_brand_entry)(Elf_Brandinfo *entry)
278 for (i = 0; i < MAX_BRANDS; i++) {
279 if (elf_brand_list[i] == entry) {
280 elf_brand_list[i] = NULL;
290 __elfN(brand_inuse)(Elf_Brandinfo *entry)
295 sx_slock(&allproc_lock);
296 FOREACH_PROC_IN_SYSTEM(p) {
297 if (p->p_sysent == entry->sysvec) {
302 sx_sunlock(&allproc_lock);
307 static Elf_Brandinfo *
308 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
309 int32_t *osrel, uint32_t *fctl0)
311 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
312 Elf_Brandinfo *bi, *bi_m;
313 boolean_t ret, has_fctl0;
314 int i, interp_name_len;
316 interp_name_len = interp != NULL ? strlen(interp) + 1 : 0;
319 * We support four types of branding -- (1) the ELF EI_OSABI field
320 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
321 * branding w/in the ELF header, (3) path of the `interp_path'
322 * field, and (4) the ".note.ABI-tag" ELF section.
325 /* Look for an ".note.ABI-tag" ELF section */
327 for (i = 0; i < MAX_BRANDS; i++) {
328 bi = elf_brand_list[i];
331 if (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)
333 if (hdr->e_machine == bi->machine && (bi->flags &
334 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
338 ret = __elfN(check_note)(imgp, bi->brand_note, osrel,
340 /* Give brand a chance to veto check_note's guess */
341 if (ret && bi->header_supported) {
342 ret = bi->header_supported(imgp, osrel,
343 has_fctl0 ? fctl0 : NULL);
346 * If note checker claimed the binary, but the
347 * interpreter path in the image does not
348 * match default one for the brand, try to
349 * search for other brands with the same
350 * interpreter. Either there is better brand
351 * with the right interpreter, or, failing
352 * this, we return first brand which accepted
353 * our note and, optionally, header.
355 if (ret && bi_m == NULL && interp != NULL &&
356 (bi->interp_path == NULL ||
357 (strlen(bi->interp_path) + 1 != interp_name_len ||
358 strncmp(interp, bi->interp_path, interp_name_len)
370 /* If the executable has a brand, search for it in the brand list. */
371 for (i = 0; i < MAX_BRANDS; i++) {
372 bi = elf_brand_list[i];
373 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 ||
374 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0))
376 if (hdr->e_machine == bi->machine &&
377 (hdr->e_ident[EI_OSABI] == bi->brand ||
378 (bi->compat_3_brand != NULL &&
379 strcmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
380 bi->compat_3_brand) == 0))) {
381 /* Looks good, but give brand a chance to veto */
382 if (bi->header_supported == NULL ||
383 bi->header_supported(imgp, NULL, NULL)) {
385 * Again, prefer strictly matching
388 if (interp_name_len == 0 &&
389 bi->interp_path == NULL)
391 if (bi->interp_path != NULL &&
392 strlen(bi->interp_path) + 1 ==
393 interp_name_len && strncmp(interp,
394 bi->interp_path, interp_name_len) == 0)
404 /* No known brand, see if the header is recognized by any brand */
405 for (i = 0; i < MAX_BRANDS; i++) {
406 bi = elf_brand_list[i];
407 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY ||
408 bi->header_supported == NULL)
410 if (hdr->e_machine == bi->machine) {
411 ret = bi->header_supported(imgp, NULL, NULL);
417 /* Lacking a known brand, search for a recognized interpreter. */
418 if (interp != NULL) {
419 for (i = 0; i < MAX_BRANDS; i++) {
420 bi = elf_brand_list[i];
421 if (bi == NULL || (bi->flags &
422 (BI_BRAND_NOTE_MANDATORY | BI_BRAND_ONLY_STATIC))
425 if (hdr->e_machine == bi->machine &&
426 bi->interp_path != NULL &&
427 /* ELF image p_filesz includes terminating zero */
428 strlen(bi->interp_path) + 1 == interp_name_len &&
429 strncmp(interp, bi->interp_path, interp_name_len)
430 == 0 && (bi->header_supported == NULL ||
431 bi->header_supported(imgp, NULL, NULL)))
436 /* Lacking a recognized interpreter, try the default brand */
437 for (i = 0; i < MAX_BRANDS; i++) {
438 bi = elf_brand_list[i];
439 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 ||
440 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0))
442 if (hdr->e_machine == bi->machine &&
443 __elfN(fallback_brand) == bi->brand &&
444 (bi->header_supported == NULL ||
445 bi->header_supported(imgp, NULL, NULL)))
452 __elfN(phdr_in_zero_page)(const Elf_Ehdr *hdr)
454 return (hdr->e_phoff <= PAGE_SIZE &&
455 (u_int)hdr->e_phentsize * hdr->e_phnum <= PAGE_SIZE - hdr->e_phoff);
459 __elfN(check_header)(const Elf_Ehdr *hdr)
465 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
466 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
467 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
468 hdr->e_phentsize != sizeof(Elf_Phdr) ||
469 hdr->e_version != ELF_TARG_VER)
473 * Make sure we have at least one brand for this machine.
476 for (i = 0; i < MAX_BRANDS; i++) {
477 bi = elf_brand_list[i];
478 if (bi != NULL && bi->machine == hdr->e_machine)
488 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
489 vm_offset_t start, vm_offset_t end, vm_prot_t prot)
496 * Create the page if it doesn't exist yet. Ignore errors.
498 vm_map_fixed(map, NULL, 0, trunc_page(start), round_page(end) -
499 trunc_page(start), VM_PROT_ALL, VM_PROT_ALL, MAP_CHECK_EXCL);
502 * Find the page from the underlying object.
504 if (object != NULL) {
505 sf = vm_imgact_map_page(object, offset);
507 return (KERN_FAILURE);
508 off = offset - trunc_page(offset);
509 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start,
511 vm_imgact_unmap_page(sf);
513 return (KERN_FAILURE);
516 return (KERN_SUCCESS);
520 __elfN(map_insert)(struct image_params *imgp, vm_map_t map, vm_object_t object,
521 vm_ooffset_t offset, vm_offset_t start, vm_offset_t end, vm_prot_t prot,
527 int error, locked, rv;
529 if (start != trunc_page(start)) {
530 rv = __elfN(map_partial)(map, object, offset, start,
531 round_page(start), prot);
532 if (rv != KERN_SUCCESS)
534 offset += round_page(start) - start;
535 start = round_page(start);
537 if (end != round_page(end)) {
538 rv = __elfN(map_partial)(map, object, offset +
539 trunc_page(end) - start, trunc_page(end), end, prot);
540 if (rv != KERN_SUCCESS)
542 end = trunc_page(end);
545 return (KERN_SUCCESS);
546 if ((offset & PAGE_MASK) != 0) {
548 * The mapping is not page aligned. This means that we have
551 rv = vm_map_fixed(map, NULL, 0, start, end - start,
552 prot | VM_PROT_WRITE, VM_PROT_ALL, MAP_CHECK_EXCL);
553 if (rv != KERN_SUCCESS)
556 return (KERN_SUCCESS);
557 for (; start < end; start += sz) {
558 sf = vm_imgact_map_page(object, offset);
560 return (KERN_FAILURE);
561 off = offset - trunc_page(offset);
563 if (sz > PAGE_SIZE - off)
564 sz = PAGE_SIZE - off;
565 error = copyout((caddr_t)sf_buf_kva(sf) + off,
567 vm_imgact_unmap_page(sf);
569 return (KERN_FAILURE);
573 vm_object_reference(object);
574 rv = vm_map_fixed(map, object, offset, start, end - start,
575 prot, VM_PROT_ALL, cow | MAP_CHECK_EXCL |
576 (object != NULL ? MAP_VN_EXEC : 0));
577 if (rv != KERN_SUCCESS) {
578 locked = VOP_ISLOCKED(imgp->vp);
579 VOP_UNLOCK(imgp->vp);
580 vm_object_deallocate(object);
581 vn_lock(imgp->vp, locked | LK_RETRY);
583 } else if (object != NULL) {
584 MPASS(imgp->vp->v_object == object);
585 VOP_SET_TEXT_CHECKED(imgp->vp);
588 return (KERN_SUCCESS);
592 __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset,
593 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot)
599 vm_offset_t map_addr;
602 vm_ooffset_t file_addr;
605 * It's necessary to fail if the filsz + offset taken from the
606 * header is greater than the actual file pager object's size.
607 * If we were to allow this, then the vm_map_find() below would
608 * walk right off the end of the file object and into the ether.
610 * While I'm here, might as well check for something else that
611 * is invalid: filsz cannot be greater than memsz.
613 if ((filsz != 0 && (off_t)filsz + offset > imgp->attr->va_size) ||
615 uprintf("elf_load_section: truncated ELF file\n");
619 object = imgp->object;
620 map = &imgp->proc->p_vmspace->vm_map;
621 map_addr = trunc_page((vm_offset_t)vmaddr);
622 file_addr = trunc_page(offset);
625 * We have two choices. We can either clear the data in the last page
626 * of an oversized mapping, or we can start the anon mapping a page
627 * early and copy the initialized data into that first page. We
632 else if (memsz > filsz)
633 map_len = trunc_page(offset + filsz) - file_addr;
635 map_len = round_page(offset + filsz) - file_addr;
638 /* cow flags: don't dump readonly sections in core */
639 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
640 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
642 rv = __elfN(map_insert)(imgp, map, object, file_addr,
643 map_addr, map_addr + map_len, prot, cow);
644 if (rv != KERN_SUCCESS)
647 /* we can stop now if we've covered it all */
653 * We have to get the remaining bit of the file into the first part
654 * of the oversized map segment. This is normally because the .data
655 * segment in the file is extended to provide bss. It's a neat idea
656 * to try and save a page, but it's a pain in the behind to implement.
658 copy_len = filsz == 0 ? 0 : (offset + filsz) - trunc_page(offset +
660 map_addr = trunc_page((vm_offset_t)vmaddr + filsz);
661 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr;
663 /* This had damn well better be true! */
665 rv = __elfN(map_insert)(imgp, map, NULL, 0, map_addr,
666 map_addr + map_len, prot, 0);
667 if (rv != KERN_SUCCESS)
672 sf = vm_imgact_map_page(object, offset + filsz);
676 /* send the page fragment to user space */
677 error = copyout((caddr_t)sf_buf_kva(sf), (caddr_t)map_addr,
679 vm_imgact_unmap_page(sf);
685 * Remove write access to the page if it was only granted by map_insert
688 if ((prot & VM_PROT_WRITE) == 0)
689 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr +
690 map_len), prot, FALSE);
696 __elfN(load_sections)(struct image_params *imgp, const Elf_Ehdr *hdr,
697 const Elf_Phdr *phdr, u_long rbase, u_long *base_addrp)
704 ASSERT_VOP_LOCKED(imgp->vp, __func__);
709 for (i = 0; i < hdr->e_phnum; i++) {
710 if (phdr[i].p_type != PT_LOAD || phdr[i].p_memsz == 0)
713 /* Loadable segment */
714 prot = __elfN(trans_prot)(phdr[i].p_flags);
715 error = __elfN(load_section)(imgp, phdr[i].p_offset,
716 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase,
717 phdr[i].p_memsz, phdr[i].p_filesz, prot);
722 * Establish the base address if this is the first segment.
725 base_addr = trunc_page(phdr[i].p_vaddr + rbase);
730 if (base_addrp != NULL)
731 *base_addrp = base_addr;
737 * Load the file "file" into memory. It may be either a shared object
740 * The "addr" reference parameter is in/out. On entry, it specifies
741 * the address where a shared object should be loaded. If the file is
742 * an executable, this value is ignored. On exit, "addr" specifies
743 * where the file was actually loaded.
745 * The "entry" reference parameter is out only. On exit, it specifies
746 * the entry point for the loaded file.
749 __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
755 struct image_params image_params;
757 const Elf_Ehdr *hdr = NULL;
758 const Elf_Phdr *phdr = NULL;
759 struct nameidata *nd;
761 struct image_params *imgp;
763 u_long base_addr = 0;
766 #ifdef CAPABILITY_MODE
768 * XXXJA: This check can go away once we are sufficiently confident
769 * that the checks in namei() are correct.
771 if (IN_CAPABILITY_MODE(curthread))
775 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK | M_ZERO);
777 attr = &tempdata->attr;
778 imgp = &tempdata->image_params;
781 * Initialize part of the common data
786 NDINIT(nd, LOOKUP, ISOPEN | FOLLOW | LOCKSHARED | LOCKLEAF,
787 UIO_SYSSPACE, file, curthread);
788 if ((error = namei(nd)) != 0) {
792 NDFREE(nd, NDF_ONLY_PNBUF);
793 imgp->vp = nd->ni_vp;
796 * Check permissions, modes, uid, etc on the file, and "open" it.
798 error = exec_check_permissions(imgp);
802 error = exec_map_first_page(imgp);
806 imgp->object = nd->ni_vp->v_object;
808 hdr = (const Elf_Ehdr *)imgp->image_header;
809 if ((error = __elfN(check_header)(hdr)) != 0)
811 if (hdr->e_type == ET_DYN)
813 else if (hdr->e_type == ET_EXEC)
820 /* Only support headers that fit within first page for now */
821 if (!__elfN(phdr_in_zero_page)(hdr)) {
826 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
827 if (!aligned(phdr, Elf_Addr)) {
832 error = __elfN(load_sections)(imgp, hdr, phdr, rbase, &base_addr);
837 *entry = (unsigned long)hdr->e_entry + rbase;
841 exec_unmap_first_page(imgp);
845 VOP_UNSET_TEXT_CHECKED(nd->ni_vp);
848 free(tempdata, M_TEMP);
854 __CONCAT(rnd_, __elfN(base))(vm_map_t map __unused, u_long minv, u_long maxv,
859 MPASS(vm_map_min(map) <= minv);
860 MPASS(maxv <= vm_map_max(map));
862 MPASS(minv + align < maxv);
863 arc4rand(&rbase, sizeof(rbase), 0);
864 res = roundup(minv, (u_long)align) + rbase % (maxv - minv);
865 res &= ~((u_long)align - 1);
869 ("res %#lx < minv %#lx, maxv %#lx rbase %#lx",
870 res, minv, maxv, rbase));
872 ("res %#lx > maxv %#lx, minv %#lx rbase %#lx",
873 res, maxv, minv, rbase));
878 __elfN(enforce_limits)(struct image_params *imgp, const Elf_Ehdr *hdr,
879 const Elf_Phdr *phdr, u_long et_dyn_addr)
881 struct vmspace *vmspace;
883 u_long text_size, data_size, total_size, text_addr, data_addr;
884 u_long seg_size, seg_addr;
888 text_size = data_size = total_size = text_addr = data_addr = 0;
890 for (i = 0; i < hdr->e_phnum; i++) {
891 if (phdr[i].p_type != PT_LOAD || phdr[i].p_memsz == 0)
894 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
895 seg_size = round_page(phdr[i].p_memsz +
896 phdr[i].p_vaddr + et_dyn_addr - seg_addr);
899 * Make the largest executable segment the official
900 * text segment and all others data.
902 * Note that obreak() assumes that data_addr + data_size == end
903 * of data load area, and the ELF file format expects segments
904 * to be sorted by address. If multiple data segments exist,
905 * the last one will be used.
908 if ((phdr[i].p_flags & PF_X) != 0 && text_size < seg_size) {
909 text_size = seg_size;
910 text_addr = seg_addr;
912 data_size = seg_size;
913 data_addr = seg_addr;
915 total_size += seg_size;
918 if (data_addr == 0 && data_size == 0) {
919 data_addr = text_addr;
920 data_size = text_size;
924 * Check limits. It should be safe to check the
925 * limits after loading the segments since we do
926 * not actually fault in all the segments pages.
928 PROC_LOCK(imgp->proc);
929 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA))
930 err_str = "Data segment size exceeds process limit";
931 else if (text_size > maxtsiz)
932 err_str = "Text segment size exceeds system limit";
933 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM))
934 err_str = "Total segment size exceeds process limit";
935 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0)
936 err_str = "Data segment size exceeds resource limit";
937 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0)
938 err_str = "Total segment size exceeds resource limit";
939 PROC_UNLOCK(imgp->proc);
940 if (err_str != NULL) {
941 uprintf("%s\n", err_str);
945 vmspace = imgp->proc->p_vmspace;
946 vmspace->vm_tsize = text_size >> PAGE_SHIFT;
947 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
948 vmspace->vm_dsize = data_size >> PAGE_SHIFT;
949 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
955 __elfN(get_interp)(struct image_params *imgp, const Elf_Phdr *phdr,
956 char **interpp, bool *free_interpp)
960 int error, interp_name_len;
962 KASSERT(phdr->p_type == PT_INTERP,
963 ("%s: p_type %u != PT_INTERP", __func__, phdr->p_type));
964 ASSERT_VOP_LOCKED(imgp->vp, __func__);
968 /* Path to interpreter */
969 if (phdr->p_filesz < 2 || phdr->p_filesz > MAXPATHLEN) {
970 uprintf("Invalid PT_INTERP\n");
974 interp_name_len = phdr->p_filesz;
975 if (phdr->p_offset > PAGE_SIZE ||
976 interp_name_len > PAGE_SIZE - phdr->p_offset) {
978 * The vnode lock might be needed by the pagedaemon to
979 * clean pages owned by the vnode. Do not allow sleep
980 * waiting for memory with the vnode locked, instead
981 * try non-sleepable allocation first, and if it
982 * fails, go to the slow path were we drop the lock
983 * and do M_WAITOK. A text reference prevents
984 * modifications to the vnode content.
986 interp = malloc(interp_name_len + 1, M_TEMP, M_NOWAIT);
987 if (interp == NULL) {
988 VOP_UNLOCK(imgp->vp);
989 interp = malloc(interp_name_len + 1, M_TEMP, M_WAITOK);
990 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
993 error = vn_rdwr(UIO_READ, imgp->vp, interp,
994 interp_name_len, phdr->p_offset,
995 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
998 free(interp, M_TEMP);
999 uprintf("i/o error PT_INTERP %d\n", error);
1002 interp[interp_name_len] = '\0';
1005 *free_interpp = true;
1009 interp = __DECONST(char *, imgp->image_header) + phdr->p_offset;
1010 if (interp[interp_name_len - 1] != '\0') {
1011 uprintf("Invalid PT_INTERP\n");
1016 *free_interpp = false;
1021 __elfN(load_interp)(struct image_params *imgp, const Elf_Brandinfo *brand_info,
1022 const char *interp, u_long *addr, u_long *entry)
1027 if (brand_info->emul_path != NULL &&
1028 brand_info->emul_path[0] != '\0') {
1029 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1030 snprintf(path, MAXPATHLEN, "%s%s",
1031 brand_info->emul_path, interp);
1032 error = __elfN(load_file)(imgp->proc, path, addr, entry);
1038 if (brand_info->interp_newpath != NULL &&
1039 (brand_info->interp_path == NULL ||
1040 strcmp(interp, brand_info->interp_path) == 0)) {
1041 error = __elfN(load_file)(imgp->proc,
1042 brand_info->interp_newpath, addr, entry);
1047 error = __elfN(load_file)(imgp->proc, interp, addr, entry);
1051 uprintf("ELF interpreter %s not found, error %d\n", interp, error);
1056 * Impossible et_dyn_addr initial value indicating that the real base
1057 * must be calculated later with some randomization applied.
1059 #define ET_DYN_ADDR_RAND 1
1062 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
1065 const Elf_Ehdr *hdr;
1066 const Elf_Phdr *phdr;
1067 Elf_Auxargs *elf_auxargs;
1068 struct vmspace *vmspace;
1071 Elf_Brandinfo *brand_info;
1072 struct sysentvec *sv;
1073 u_long addr, baddr, et_dyn_addr, entry, proghdr;
1074 u_long maxalign, mapsz, maxv, maxv1;
1080 hdr = (const Elf_Ehdr *)imgp->image_header;
1083 * Do we have a valid ELF header ?
1085 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later
1086 * if particular brand doesn't support it.
1088 if (__elfN(check_header)(hdr) != 0 ||
1089 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
1093 * From here on down, we return an errno, not -1, as we've
1094 * detected an ELF file.
1097 if (!__elfN(phdr_in_zero_page)(hdr)) {
1098 uprintf("Program headers not in the first page\n");
1101 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
1102 if (!aligned(phdr, Elf_Addr)) {
1103 uprintf("Unaligned program headers\n");
1111 entry = proghdr = 0;
1113 free_interp = false;
1115 maxalign = PAGE_SIZE;
1118 for (i = 0; i < hdr->e_phnum; i++) {
1119 switch (phdr[i].p_type) {
1122 baddr = phdr[i].p_vaddr;
1123 if (phdr[i].p_align > maxalign)
1124 maxalign = phdr[i].p_align;
1125 mapsz += phdr[i].p_memsz;
1129 * If this segment contains the program headers,
1130 * remember their virtual address for the AT_PHDR
1131 * aux entry. Static binaries don't usually include
1134 if (phdr[i].p_offset == 0 &&
1135 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize
1136 <= phdr[i].p_filesz)
1137 proghdr = phdr[i].p_vaddr + hdr->e_phoff;
1140 /* Path to interpreter */
1141 if (interp != NULL) {
1142 uprintf("Multiple PT_INTERP headers\n");
1146 error = __elfN(get_interp)(imgp, &phdr[i], &interp,
1152 if (__elfN(nxstack))
1154 __elfN(trans_prot)(phdr[i].p_flags);
1155 imgp->stack_sz = phdr[i].p_memsz;
1157 case PT_PHDR: /* Program header table info */
1158 proghdr = phdr[i].p_vaddr;
1163 brand_info = __elfN(get_brandinfo)(imgp, interp, &osrel, &fctl0);
1164 if (brand_info == NULL) {
1165 uprintf("ELF binary type \"%u\" not known.\n",
1166 hdr->e_ident[EI_OSABI]);
1170 sv = brand_info->sysvec;
1172 if (hdr->e_type == ET_DYN) {
1173 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) {
1174 uprintf("Cannot execute shared object\n");
1179 * Honour the base load address from the dso if it is
1180 * non-zero for some reason.
1183 if ((sv->sv_flags & SV_ASLR) == 0 ||
1184 (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0)
1185 et_dyn_addr = __elfN(pie_base);
1186 else if ((__elfN(pie_aslr_enabled) &&
1187 (imgp->proc->p_flag2 & P2_ASLR_DISABLE) == 0) ||
1188 (imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0)
1189 et_dyn_addr = ET_DYN_ADDR_RAND;
1191 et_dyn_addr = __elfN(pie_base);
1196 * Avoid a possible deadlock if the current address space is destroyed
1197 * and that address space maps the locked vnode. In the common case,
1198 * the locked vnode's v_usecount is decremented but remains greater
1199 * than zero. Consequently, the vnode lock is not needed by vrele().
1200 * However, in cases where the vnode lock is external, such as nullfs,
1201 * v_usecount may become zero.
1203 * The VV_TEXT flag prevents modifications to the executable while
1204 * the vnode is unlocked.
1206 VOP_UNLOCK(imgp->vp);
1209 * Decide whether to enable randomization of user mappings.
1210 * First, reset user preferences for the setid binaries.
1211 * Then, account for the support of the randomization by the
1212 * ABI, by user preferences, and make special treatment for
1215 if (imgp->credential_setid) {
1216 PROC_LOCK(imgp->proc);
1217 imgp->proc->p_flag2 &= ~(P2_ASLR_ENABLE | P2_ASLR_DISABLE);
1218 PROC_UNLOCK(imgp->proc);
1220 if ((sv->sv_flags & SV_ASLR) == 0 ||
1221 (imgp->proc->p_flag2 & P2_ASLR_DISABLE) != 0 ||
1222 (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0) {
1223 KASSERT(et_dyn_addr != ET_DYN_ADDR_RAND,
1224 ("et_dyn_addr == RAND and !ASLR"));
1225 } else if ((imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0 ||
1226 (__elfN(aslr_enabled) && hdr->e_type == ET_EXEC) ||
1227 et_dyn_addr == ET_DYN_ADDR_RAND) {
1228 imgp->map_flags |= MAP_ASLR;
1230 * If user does not care about sbrk, utilize the bss
1231 * grow region for mappings as well. We can select
1232 * the base for the image anywere and still not suffer
1233 * from the fragmentation.
1235 if (!__elfN(aslr_honor_sbrk) ||
1236 (imgp->proc->p_flag2 & P2_ASLR_IGNSTART) != 0)
1237 imgp->map_flags |= MAP_ASLR_IGNSTART;
1240 error = exec_new_vmspace(imgp, sv);
1241 vmspace = imgp->proc->p_vmspace;
1242 map = &vmspace->vm_map;
1244 imgp->proc->p_sysent = sv;
1246 maxv = vm_map_max(map) - lim_max(td, RLIMIT_STACK);
1247 if (et_dyn_addr == ET_DYN_ADDR_RAND) {
1248 KASSERT((map->flags & MAP_ASLR) != 0,
1249 ("ET_DYN_ADDR_RAND but !MAP_ASLR"));
1250 et_dyn_addr = __CONCAT(rnd_, __elfN(base))(map,
1251 vm_map_min(map) + mapsz + lim_max(td, RLIMIT_DATA),
1252 /* reserve half of the address space to interpreter */
1253 maxv / 2, 1UL << flsl(maxalign));
1256 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
1260 error = __elfN(load_sections)(imgp, hdr, phdr, et_dyn_addr, NULL);
1264 error = __elfN(enforce_limits)(imgp, hdr, phdr, et_dyn_addr);
1268 entry = (u_long)hdr->e_entry + et_dyn_addr;
1271 * We load the dynamic linker where a userland call
1272 * to mmap(0, ...) would put it. The rationale behind this
1273 * calculation is that it leaves room for the heap to grow to
1274 * its maximum allowed size.
1276 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td,
1278 if ((map->flags & MAP_ASLR) != 0) {
1279 maxv1 = maxv / 2 + addr / 2;
1280 MPASS(maxv1 >= addr); /* No overflow */
1281 map->anon_loc = __CONCAT(rnd_, __elfN(base))(map, addr, maxv1,
1282 MAXPAGESIZES > 1 ? pagesizes[1] : pagesizes[0]);
1284 map->anon_loc = addr;
1287 imgp->entry_addr = entry;
1289 if (interp != NULL) {
1290 VOP_UNLOCK(imgp->vp);
1291 if ((map->flags & MAP_ASLR) != 0) {
1292 /* Assume that interpeter fits into 1/4 of AS */
1293 maxv1 = maxv / 2 + addr / 2;
1294 MPASS(maxv1 >= addr); /* No overflow */
1295 addr = __CONCAT(rnd_, __elfN(base))(map, addr,
1298 error = __elfN(load_interp)(imgp, brand_info, interp, &addr,
1300 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
1307 * Construct auxargs table (used by the copyout_auxargs routine)
1309 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_NOWAIT);
1310 if (elf_auxargs == NULL) {
1311 VOP_UNLOCK(imgp->vp);
1312 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
1313 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
1315 elf_auxargs->execfd = -1;
1316 elf_auxargs->phdr = proghdr + et_dyn_addr;
1317 elf_auxargs->phent = hdr->e_phentsize;
1318 elf_auxargs->phnum = hdr->e_phnum;
1319 elf_auxargs->pagesz = PAGE_SIZE;
1320 elf_auxargs->base = addr;
1321 elf_auxargs->flags = 0;
1322 elf_auxargs->entry = entry;
1323 elf_auxargs->hdr_eflags = hdr->e_flags;
1325 imgp->auxargs = elf_auxargs;
1326 imgp->interpreted = 0;
1327 imgp->reloc_base = addr;
1328 imgp->proc->p_osrel = osrel;
1329 imgp->proc->p_fctl0 = fctl0;
1330 imgp->proc->p_elf_machine = hdr->e_machine;
1331 imgp->proc->p_elf_flags = hdr->e_flags;
1335 free(interp, M_TEMP);
1339 #define suword __CONCAT(suword, __ELF_WORD_SIZE)
1342 __elfN(freebsd_copyout_auxargs)(struct image_params *imgp, uintptr_t base)
1344 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
1345 Elf_Auxinfo *argarray, *pos;
1348 argarray = pos = malloc(AT_COUNT * sizeof(*pos), M_TEMP,
1351 if (args->execfd != -1)
1352 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
1353 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
1354 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
1355 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
1356 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
1357 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
1358 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
1359 AUXARGS_ENTRY(pos, AT_BASE, args->base);
1360 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags);
1361 if (imgp->execpathp != 0)
1362 AUXARGS_ENTRY_PTR(pos, AT_EXECPATH, imgp->execpathp);
1363 AUXARGS_ENTRY(pos, AT_OSRELDATE,
1364 imgp->proc->p_ucred->cr_prison->pr_osreldate);
1365 if (imgp->canary != 0) {
1366 AUXARGS_ENTRY_PTR(pos, AT_CANARY, imgp->canary);
1367 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen);
1369 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus);
1370 if (imgp->pagesizes != 0) {
1371 AUXARGS_ENTRY_PTR(pos, AT_PAGESIZES, imgp->pagesizes);
1372 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen);
1374 if (imgp->sysent->sv_timekeep_base != 0) {
1375 AUXARGS_ENTRY(pos, AT_TIMEKEEP,
1376 imgp->sysent->sv_timekeep_base);
1378 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj
1379 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot :
1380 imgp->sysent->sv_stackprot);
1381 if (imgp->sysent->sv_hwcap != NULL)
1382 AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap);
1383 if (imgp->sysent->sv_hwcap2 != NULL)
1384 AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2);
1385 AUXARGS_ENTRY(pos, AT_BSDFLAGS, __elfN(sigfastblock) ?
1386 ELF_BSDF_SIGFASTBLK : 0);
1387 AUXARGS_ENTRY(pos, AT_ARGC, imgp->args->argc);
1388 AUXARGS_ENTRY_PTR(pos, AT_ARGV, imgp->argv);
1389 AUXARGS_ENTRY(pos, AT_ENVC, imgp->args->envc);
1390 AUXARGS_ENTRY_PTR(pos, AT_ENVV, imgp->envv);
1391 AUXARGS_ENTRY_PTR(pos, AT_PS_STRINGS, imgp->ps_strings);
1392 if (imgp->sysent->sv_fxrng_gen_base != 0)
1393 AUXARGS_ENTRY(pos, AT_FXRNG, imgp->sysent->sv_fxrng_gen_base);
1394 AUXARGS_ENTRY(pos, AT_NULL, 0);
1396 free(imgp->auxargs, M_TEMP);
1397 imgp->auxargs = NULL;
1398 KASSERT(pos - argarray <= AT_COUNT, ("Too many auxargs"));
1400 error = copyout(argarray, (void *)base, sizeof(*argarray) * AT_COUNT);
1401 free(argarray, M_TEMP);
1406 __elfN(freebsd_fixup)(uintptr_t *stack_base, struct image_params *imgp)
1410 base = (Elf_Addr *)*stack_base;
1412 if (suword(base, imgp->args->argc) == -1)
1414 *stack_base = (uintptr_t)base;
1419 * Code for generating ELF core dumps.
1422 typedef void (*segment_callback)(vm_map_entry_t, void *);
1424 /* Closure for cb_put_phdr(). */
1425 struct phdr_closure {
1426 Elf_Phdr *phdr; /* Program header to fill in */
1427 Elf_Off offset; /* Offset of segment in core file */
1430 /* Closure for cb_size_segment(). */
1431 struct sseg_closure {
1432 int count; /* Count of writable segments. */
1433 size_t size; /* Total size of all writable segments. */
1436 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *);
1439 int type; /* Note type. */
1440 outfunc_t outfunc; /* Output function. */
1441 void *outarg; /* Argument for the output function. */
1442 size_t outsize; /* Output size. */
1443 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */
1446 TAILQ_HEAD(note_info_list, note_info);
1448 /* Coredump output parameters. */
1449 struct coredump_params {
1451 struct ucred *active_cred;
1452 struct ucred *file_cred;
1455 struct compressor *comp;
1458 extern int compress_user_cores;
1459 extern int compress_user_cores_level;
1461 static void cb_put_phdr(vm_map_entry_t, void *);
1462 static void cb_size_segment(vm_map_entry_t, void *);
1463 static int core_write(struct coredump_params *, const void *, size_t, off_t,
1464 enum uio_seg, size_t *);
1465 static void each_dumpable_segment(struct thread *, segment_callback, void *);
1466 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t,
1467 struct note_info_list *, size_t);
1468 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *,
1470 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t);
1471 static void __elfN(putnote)(struct note_info *, struct sbuf *);
1472 static size_t register_note(struct note_info_list *, int, outfunc_t, void *);
1473 static int sbuf_drain_core_output(void *, const char *, int);
1475 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *);
1476 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *);
1477 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *);
1478 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *);
1479 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *);
1480 static void __elfN(note_ptlwpinfo)(void *, struct sbuf *, size_t *);
1481 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *);
1482 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *);
1483 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *);
1484 static void note_procstat_files(void *, struct sbuf *, size_t *);
1485 static void note_procstat_groups(void *, struct sbuf *, size_t *);
1486 static void note_procstat_osrel(void *, struct sbuf *, size_t *);
1487 static void note_procstat_rlimit(void *, struct sbuf *, size_t *);
1488 static void note_procstat_umask(void *, struct sbuf *, size_t *);
1489 static void note_procstat_vmmap(void *, struct sbuf *, size_t *);
1492 * Write out a core segment to the compression stream.
1495 compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len)
1501 chunk_len = MIN(len, CORE_BUF_SIZE);
1504 * We can get EFAULT error here.
1505 * In that case zero out the current chunk of the segment.
1507 error = copyin(base, buf, chunk_len);
1509 bzero(buf, chunk_len);
1510 error = compressor_write(p->comp, buf, chunk_len);
1520 core_compressed_write(void *base, size_t len, off_t offset, void *arg)
1523 return (core_write((struct coredump_params *)arg, base, len, offset,
1524 UIO_SYSSPACE, NULL));
1528 core_write(struct coredump_params *p, const void *base, size_t len,
1529 off_t offset, enum uio_seg seg, size_t *resid)
1532 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, __DECONST(void *, base),
1533 len, offset, seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED,
1534 p->active_cred, p->file_cred, resid, p->td));
1538 core_output(char *base, size_t len, off_t offset, struct coredump_params *p,
1543 size_t resid, runlen;
1547 KASSERT((uintptr_t)base % PAGE_SIZE == 0,
1548 ("%s: user address %p is not page-aligned", __func__, base));
1550 if (p->comp != NULL)
1551 return (compress_chunk(p, base, tmpbuf, len));
1553 map = &p->td->td_proc->p_vmspace->vm_map;
1554 for (; len > 0; base += runlen, offset += runlen, len -= runlen) {
1556 * Attempt to page in all virtual pages in the range. If a
1557 * virtual page is not backed by the pager, it is represented as
1558 * a hole in the file. This can occur with zero-filled
1559 * anonymous memory or truncated files, for example.
1561 for (runlen = 0; runlen < len; runlen += PAGE_SIZE) {
1562 error = vm_fault(map, (uintptr_t)base + runlen,
1563 VM_PROT_READ, VM_FAULT_NOFILL, NULL);
1565 success = error == KERN_SUCCESS;
1566 else if ((error == KERN_SUCCESS) != success)
1571 error = core_write(p, base, runlen, offset,
1572 UIO_USERSPACE, &resid);
1574 if (error != EFAULT)
1578 * EFAULT may be returned if the user mapping
1579 * could not be accessed, e.g., because a mapped
1580 * file has been truncated. Skip the page if no
1581 * progress was made, to protect against a
1582 * hypothetical scenario where vm_fault() was
1583 * successful but core_write() returns EFAULT
1594 error = vn_start_write(p->vp, &mp, V_WAIT);
1597 vn_lock(p->vp, LK_EXCLUSIVE | LK_RETRY);
1598 error = vn_truncate_locked(p->vp, offset + runlen,
1599 false, p->td->td_ucred);
1601 vn_finished_write(mp);
1610 * Drain into a core file.
1613 sbuf_drain_core_output(void *arg, const char *data, int len)
1615 struct coredump_params *p;
1618 p = (struct coredump_params *)arg;
1621 * Some kern_proc out routines that print to this sbuf may
1622 * call us with the process lock held. Draining with the
1623 * non-sleepable lock held is unsafe. The lock is needed for
1624 * those routines when dumping a live process. In our case we
1625 * can safely release the lock before draining and acquire
1628 locked = PROC_LOCKED(p->td->td_proc);
1630 PROC_UNLOCK(p->td->td_proc);
1631 if (p->comp != NULL)
1632 error = compressor_write(p->comp, __DECONST(char *, data), len);
1634 error = core_write(p, __DECONST(void *, data), len, p->offset,
1635 UIO_SYSSPACE, NULL);
1637 PROC_LOCK(p->td->td_proc);
1645 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags)
1647 struct ucred *cred = td->td_ucred;
1649 struct sseg_closure seginfo;
1650 struct note_info_list notelst;
1651 struct coredump_params params;
1652 struct note_info *ninfo;
1654 size_t hdrsize, notesz, coresize;
1658 TAILQ_INIT(¬elst);
1660 /* Size the program segments. */
1663 each_dumpable_segment(td, cb_size_segment, &seginfo);
1666 * Collect info about the core file header area.
1668 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count);
1669 if (seginfo.count + 1 >= PN_XNUM)
1670 hdrsize += sizeof(Elf_Shdr);
1671 __elfN(prepare_notes)(td, ¬elst, ¬esz);
1672 coresize = round_page(hdrsize + notesz) + seginfo.size;
1674 /* Set up core dump parameters. */
1676 params.active_cred = cred;
1677 params.file_cred = NOCRED;
1684 PROC_LOCK(td->td_proc);
1685 error = racct_add(td->td_proc, RACCT_CORE, coresize);
1686 PROC_UNLOCK(td->td_proc);
1693 if (coresize >= limit) {
1698 /* Create a compression stream if necessary. */
1699 if (compress_user_cores != 0) {
1700 params.comp = compressor_init(core_compressed_write,
1701 compress_user_cores, CORE_BUF_SIZE,
1702 compress_user_cores_level, ¶ms);
1703 if (params.comp == NULL) {
1707 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO);
1711 * Allocate memory for building the header, fill it up,
1712 * and write it out following the notes.
1714 hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
1715 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst,
1718 /* Write the contents of all of the writable segments. */
1724 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
1725 offset = round_page(hdrsize + notesz);
1726 for (i = 0; i < seginfo.count; i++) {
1727 error = core_output((char *)(uintptr_t)php->p_vaddr,
1728 php->p_filesz, offset, ¶ms, tmpbuf);
1731 offset += php->p_filesz;
1734 if (error == 0 && params.comp != NULL)
1735 error = compressor_flush(params.comp);
1739 "Failed to write core file for process %s (error %d)\n",
1740 curproc->p_comm, error);
1744 free(tmpbuf, M_TEMP);
1745 if (params.comp != NULL)
1746 compressor_fini(params.comp);
1747 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) {
1748 TAILQ_REMOVE(¬elst, ninfo, link);
1749 free(ninfo, M_TEMP);
1758 * A callback for each_dumpable_segment() to write out the segment's
1759 * program header entry.
1762 cb_put_phdr(vm_map_entry_t entry, void *closure)
1764 struct phdr_closure *phc = (struct phdr_closure *)closure;
1765 Elf_Phdr *phdr = phc->phdr;
1767 phc->offset = round_page(phc->offset);
1769 phdr->p_type = PT_LOAD;
1770 phdr->p_offset = phc->offset;
1771 phdr->p_vaddr = entry->start;
1773 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1774 phdr->p_align = PAGE_SIZE;
1775 phdr->p_flags = __elfN(untrans_prot)(entry->protection);
1777 phc->offset += phdr->p_filesz;
1782 * A callback for each_dumpable_segment() to gather information about
1783 * the number of segments and their total size.
1786 cb_size_segment(vm_map_entry_t entry, void *closure)
1788 struct sseg_closure *ssc = (struct sseg_closure *)closure;
1791 ssc->size += entry->end - entry->start;
1795 * For each writable segment in the process's memory map, call the given
1796 * function with a pointer to the map entry and some arbitrary
1797 * caller-supplied data.
1800 each_dumpable_segment(struct thread *td, segment_callback func, void *closure)
1802 struct proc *p = td->td_proc;
1803 vm_map_t map = &p->p_vmspace->vm_map;
1804 vm_map_entry_t entry;
1805 vm_object_t backing_object, object;
1808 vm_map_lock_read(map);
1809 VM_MAP_ENTRY_FOREACH(entry, map) {
1811 * Don't dump inaccessible mappings, deal with legacy
1814 * Note that read-only segments related to the elf binary
1815 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1816 * need to arbitrarily ignore such segments.
1818 if (elf_legacy_coredump) {
1819 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW)
1822 if ((entry->protection & VM_PROT_ALL) == 0)
1827 * Dont include memory segment in the coredump if
1828 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1829 * madvise(2). Do not dump submaps (i.e. parts of the
1832 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP))
1835 if ((object = entry->object.vm_object) == NULL)
1838 /* Ignore memory-mapped devices and such things. */
1839 VM_OBJECT_RLOCK(object);
1840 while ((backing_object = object->backing_object) != NULL) {
1841 VM_OBJECT_RLOCK(backing_object);
1842 VM_OBJECT_RUNLOCK(object);
1843 object = backing_object;
1845 ignore_entry = (object->flags & OBJ_FICTITIOUS) != 0;
1846 VM_OBJECT_RUNLOCK(object);
1850 (*func)(entry, closure);
1852 vm_map_unlock_read(map);
1856 * Write the core file header to the file, including padding up to
1857 * the page boundary.
1860 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr,
1861 size_t hdrsize, struct note_info_list *notelst, size_t notesz)
1863 struct note_info *ninfo;
1867 /* Fill in the header. */
1868 bzero(hdr, hdrsize);
1869 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz);
1871 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN);
1872 sbuf_set_drain(sb, sbuf_drain_core_output, p);
1873 sbuf_start_section(sb, NULL);
1874 sbuf_bcat(sb, hdr, hdrsize);
1875 TAILQ_FOREACH(ninfo, notelst, link)
1876 __elfN(putnote)(ninfo, sb);
1877 /* Align up to a page boundary for the program segments. */
1878 sbuf_end_section(sb, -1, PAGE_SIZE, 0);
1879 error = sbuf_finish(sb);
1886 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list,
1896 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p);
1899 * To have the debugger select the right thread (LWP) as the initial
1900 * thread, we dump the state of the thread passed to us in td first.
1901 * This is the thread that causes the core dump and thus likely to
1902 * be the right thread one wants to have selected in the debugger.
1905 while (thr != NULL) {
1906 size += register_note(list, NT_PRSTATUS,
1907 __elfN(note_prstatus), thr);
1908 size += register_note(list, NT_FPREGSET,
1909 __elfN(note_fpregset), thr);
1910 size += register_note(list, NT_THRMISC,
1911 __elfN(note_thrmisc), thr);
1912 size += register_note(list, NT_PTLWPINFO,
1913 __elfN(note_ptlwpinfo), thr);
1914 size += register_note(list, -1,
1915 __elfN(note_threadmd), thr);
1917 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) :
1918 TAILQ_NEXT(thr, td_plist);
1920 thr = TAILQ_NEXT(thr, td_plist);
1923 size += register_note(list, NT_PROCSTAT_PROC,
1924 __elfN(note_procstat_proc), p);
1925 size += register_note(list, NT_PROCSTAT_FILES,
1926 note_procstat_files, p);
1927 size += register_note(list, NT_PROCSTAT_VMMAP,
1928 note_procstat_vmmap, p);
1929 size += register_note(list, NT_PROCSTAT_GROUPS,
1930 note_procstat_groups, p);
1931 size += register_note(list, NT_PROCSTAT_UMASK,
1932 note_procstat_umask, p);
1933 size += register_note(list, NT_PROCSTAT_RLIMIT,
1934 note_procstat_rlimit, p);
1935 size += register_note(list, NT_PROCSTAT_OSREL,
1936 note_procstat_osrel, p);
1937 size += register_note(list, NT_PROCSTAT_PSSTRINGS,
1938 __elfN(note_procstat_psstrings), p);
1939 size += register_note(list, NT_PROCSTAT_AUXV,
1940 __elfN(note_procstat_auxv), p);
1946 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs,
1952 struct phdr_closure phc;
1954 ehdr = (Elf_Ehdr *)hdr;
1956 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1957 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1958 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1959 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1960 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1961 ehdr->e_ident[EI_DATA] = ELF_DATA;
1962 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1963 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
1964 ehdr->e_ident[EI_ABIVERSION] = 0;
1965 ehdr->e_ident[EI_PAD] = 0;
1966 ehdr->e_type = ET_CORE;
1967 ehdr->e_machine = td->td_proc->p_elf_machine;
1968 ehdr->e_version = EV_CURRENT;
1970 ehdr->e_phoff = sizeof(Elf_Ehdr);
1971 ehdr->e_flags = td->td_proc->p_elf_flags;
1972 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1973 ehdr->e_phentsize = sizeof(Elf_Phdr);
1974 ehdr->e_shentsize = sizeof(Elf_Shdr);
1975 ehdr->e_shstrndx = SHN_UNDEF;
1976 if (numsegs + 1 < PN_XNUM) {
1977 ehdr->e_phnum = numsegs + 1;
1980 ehdr->e_phnum = PN_XNUM;
1983 ehdr->e_shoff = ehdr->e_phoff +
1984 (numsegs + 1) * ehdr->e_phentsize;
1985 KASSERT(ehdr->e_shoff == hdrsize - sizeof(Elf_Shdr),
1986 ("e_shoff: %zu, hdrsize - shdr: %zu",
1987 (size_t)ehdr->e_shoff, hdrsize - sizeof(Elf_Shdr)));
1989 shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff);
1990 memset(shdr, 0, sizeof(*shdr));
1992 * A special first section is used to hold large segment and
1993 * section counts. This was proposed by Sun Microsystems in
1994 * Solaris and has been adopted by Linux; the standard ELF
1995 * tools are already familiar with the technique.
1997 * See table 7-7 of the Solaris "Linker and Libraries Guide"
1998 * (or 12-7 depending on the version of the document) for more
2001 shdr->sh_type = SHT_NULL;
2002 shdr->sh_size = ehdr->e_shnum;
2003 shdr->sh_link = ehdr->e_shstrndx;
2004 shdr->sh_info = numsegs + 1;
2008 * Fill in the program header entries.
2010 phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff);
2012 /* The note segement. */
2013 phdr->p_type = PT_NOTE;
2014 phdr->p_offset = hdrsize;
2017 phdr->p_filesz = notesz;
2019 phdr->p_flags = PF_R;
2020 phdr->p_align = ELF_NOTE_ROUNDSIZE;
2023 /* All the writable segments from the program. */
2025 phc.offset = round_page(hdrsize + notesz);
2026 each_dumpable_segment(td, cb_put_phdr, &phc);
2030 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg)
2032 struct note_info *ninfo;
2033 size_t size, notesize;
2036 out(arg, NULL, &size);
2037 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK);
2039 ninfo->outfunc = out;
2040 ninfo->outarg = arg;
2041 ninfo->outsize = size;
2042 TAILQ_INSERT_TAIL(list, ninfo, link);
2047 notesize = sizeof(Elf_Note) + /* note header */
2048 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
2050 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
2056 append_note_data(const void *src, void *dst, size_t len)
2060 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE);
2062 bcopy(src, dst, len);
2063 bzero((char *)dst + len, padded_len - len);
2065 return (padded_len);
2069 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp)
2077 note = (Elf_Note *)buf;
2078 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR);
2079 note->n_descsz = size;
2080 note->n_type = type;
2081 buf += sizeof(*note);
2082 buf += append_note_data(FREEBSD_ABI_VENDOR, buf,
2083 sizeof(FREEBSD_ABI_VENDOR));
2084 append_note_data(src, buf, size);
2089 notesize = sizeof(Elf_Note) + /* note header */
2090 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
2092 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
2098 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb)
2101 ssize_t old_len, sect_len;
2102 size_t new_len, descsz, i;
2104 if (ninfo->type == -1) {
2105 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
2109 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR);
2110 note.n_descsz = ninfo->outsize;
2111 note.n_type = ninfo->type;
2113 sbuf_bcat(sb, ¬e, sizeof(note));
2114 sbuf_start_section(sb, &old_len);
2115 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR));
2116 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
2117 if (note.n_descsz == 0)
2119 sbuf_start_section(sb, &old_len);
2120 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
2121 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
2125 new_len = (size_t)sect_len;
2126 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE);
2127 if (new_len < descsz) {
2129 * It is expected that individual note emitters will correctly
2130 * predict their expected output size and fill up to that size
2131 * themselves, padding in a format-specific way if needed.
2132 * However, in case they don't, just do it here with zeros.
2134 for (i = 0; i < descsz - new_len; i++)
2136 } else if (new_len > descsz) {
2138 * We can't always truncate sb -- we may have drained some
2141 KASSERT(new_len == descsz, ("%s: Note type %u changed as we "
2142 "read it (%zu > %zu). Since it is longer than "
2143 "expected, this coredump's notes are corrupt. THIS "
2144 "IS A BUG in the note_procstat routine for type %u.\n",
2145 __func__, (unsigned)note.n_type, new_len, descsz,
2146 (unsigned)note.n_type));
2151 * Miscellaneous note out functions.
2154 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2155 #include <compat/freebsd32/freebsd32.h>
2156 #include <compat/freebsd32/freebsd32_signal.h>
2158 typedef struct prstatus32 elf_prstatus_t;
2159 typedef struct prpsinfo32 elf_prpsinfo_t;
2160 typedef struct fpreg32 elf_prfpregset_t;
2161 typedef struct fpreg32 elf_fpregset_t;
2162 typedef struct reg32 elf_gregset_t;
2163 typedef struct thrmisc32 elf_thrmisc_t;
2164 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32
2165 typedef struct kinfo_proc32 elf_kinfo_proc_t;
2166 typedef uint32_t elf_ps_strings_t;
2168 typedef prstatus_t elf_prstatus_t;
2169 typedef prpsinfo_t elf_prpsinfo_t;
2170 typedef prfpregset_t elf_prfpregset_t;
2171 typedef prfpregset_t elf_fpregset_t;
2172 typedef gregset_t elf_gregset_t;
2173 typedef thrmisc_t elf_thrmisc_t;
2174 #define ELF_KERN_PROC_MASK 0
2175 typedef struct kinfo_proc elf_kinfo_proc_t;
2176 typedef vm_offset_t elf_ps_strings_t;
2180 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep)
2186 elf_prpsinfo_t *psinfo;
2189 p = (struct proc *)arg;
2191 KASSERT(*sizep == sizeof(*psinfo), ("invalid size"));
2192 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK);
2193 psinfo->pr_version = PRPSINFO_VERSION;
2194 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t);
2195 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
2197 if (p->p_args != NULL) {
2198 len = sizeof(psinfo->pr_psargs) - 1;
2199 if (len > p->p_args->ar_length)
2200 len = p->p_args->ar_length;
2201 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len);
2207 sbuf_new(&sbarg, psinfo->pr_psargs,
2208 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN);
2209 error = proc_getargv(curthread, p, &sbarg);
2211 if (sbuf_finish(&sbarg) == 0)
2212 len = sbuf_len(&sbarg) - 1;
2214 len = sizeof(psinfo->pr_psargs) - 1;
2215 sbuf_delete(&sbarg);
2217 if (error || len == 0)
2218 strlcpy(psinfo->pr_psargs, p->p_comm,
2219 sizeof(psinfo->pr_psargs));
2221 KASSERT(len < sizeof(psinfo->pr_psargs),
2222 ("len is too long: %zu vs %zu", len,
2223 sizeof(psinfo->pr_psargs)));
2224 cp = psinfo->pr_psargs;
2227 cp = memchr(cp, '\0', end - cp);
2233 psinfo->pr_pid = p->p_pid;
2234 sbuf_bcat(sb, psinfo, sizeof(*psinfo));
2235 free(psinfo, M_TEMP);
2237 *sizep = sizeof(*psinfo);
2241 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep)
2244 elf_prstatus_t *status;
2246 td = (struct thread *)arg;
2248 KASSERT(*sizep == sizeof(*status), ("invalid size"));
2249 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK);
2250 status->pr_version = PRSTATUS_VERSION;
2251 status->pr_statussz = sizeof(elf_prstatus_t);
2252 status->pr_gregsetsz = sizeof(elf_gregset_t);
2253 status->pr_fpregsetsz = sizeof(elf_fpregset_t);
2254 status->pr_osreldate = osreldate;
2255 status->pr_cursig = td->td_proc->p_sig;
2256 status->pr_pid = td->td_tid;
2257 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2258 fill_regs32(td, &status->pr_reg);
2260 fill_regs(td, &status->pr_reg);
2262 sbuf_bcat(sb, status, sizeof(*status));
2263 free(status, M_TEMP);
2265 *sizep = sizeof(*status);
2269 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep)
2272 elf_prfpregset_t *fpregset;
2274 td = (struct thread *)arg;
2276 KASSERT(*sizep == sizeof(*fpregset), ("invalid size"));
2277 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK);
2278 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2279 fill_fpregs32(td, fpregset);
2281 fill_fpregs(td, fpregset);
2283 sbuf_bcat(sb, fpregset, sizeof(*fpregset));
2284 free(fpregset, M_TEMP);
2286 *sizep = sizeof(*fpregset);
2290 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep)
2293 elf_thrmisc_t thrmisc;
2295 td = (struct thread *)arg;
2297 KASSERT(*sizep == sizeof(thrmisc), ("invalid size"));
2298 bzero(&thrmisc, sizeof(thrmisc));
2299 strcpy(thrmisc.pr_tname, td->td_name);
2300 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc));
2302 *sizep = sizeof(thrmisc);
2306 __elfN(note_ptlwpinfo)(void *arg, struct sbuf *sb, size_t *sizep)
2311 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2312 struct ptrace_lwpinfo32 pl;
2314 struct ptrace_lwpinfo pl;
2317 td = (struct thread *)arg;
2318 size = sizeof(structsize) + sizeof(pl);
2320 KASSERT(*sizep == size, ("invalid size"));
2321 structsize = sizeof(pl);
2322 sbuf_bcat(sb, &structsize, sizeof(structsize));
2323 bzero(&pl, sizeof(pl));
2324 pl.pl_lwpid = td->td_tid;
2325 pl.pl_event = PL_EVENT_NONE;
2326 pl.pl_sigmask = td->td_sigmask;
2327 pl.pl_siglist = td->td_siglist;
2328 if (td->td_si.si_signo != 0) {
2329 pl.pl_event = PL_EVENT_SIGNAL;
2330 pl.pl_flags |= PL_FLAG_SI;
2331 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2332 siginfo_to_siginfo32(&td->td_si, &pl.pl_siginfo);
2334 pl.pl_siginfo = td->td_si;
2337 strcpy(pl.pl_tdname, td->td_name);
2338 /* XXX TODO: supply more information in struct ptrace_lwpinfo*/
2339 sbuf_bcat(sb, &pl, sizeof(pl));
2345 * Allow for MD specific notes, as well as any MD
2346 * specific preparations for writing MI notes.
2349 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep)
2355 td = (struct thread *)arg;
2357 if (size != 0 && sb != NULL)
2358 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK);
2362 __elfN(dump_thread)(td, buf, &size);
2363 KASSERT(sb == NULL || *sizep == size, ("invalid size"));
2364 if (size != 0 && sb != NULL)
2365 sbuf_bcat(sb, buf, size);
2370 #ifdef KINFO_PROC_SIZE
2371 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
2375 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep)
2381 p = (struct proc *)arg;
2382 size = sizeof(structsize) + p->p_numthreads *
2383 sizeof(elf_kinfo_proc_t);
2386 KASSERT(*sizep == size, ("invalid size"));
2387 structsize = sizeof(elf_kinfo_proc_t);
2388 sbuf_bcat(sb, &structsize, sizeof(structsize));
2390 kern_proc_out(p, sb, ELF_KERN_PROC_MASK);
2395 #ifdef KINFO_FILE_SIZE
2396 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE);
2400 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep)
2403 size_t size, sect_sz, i;
2404 ssize_t start_len, sect_len;
2405 int structsize, filedesc_flags;
2407 if (coredump_pack_fileinfo)
2408 filedesc_flags = KERN_FILEDESC_PACK_KINFO;
2412 p = (struct proc *)arg;
2413 structsize = sizeof(struct kinfo_file);
2416 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2417 sbuf_set_drain(sb, sbuf_count_drain, &size);
2418 sbuf_bcat(sb, &structsize, sizeof(structsize));
2420 kern_proc_filedesc_out(p, sb, -1, filedesc_flags);
2425 sbuf_start_section(sb, &start_len);
2427 sbuf_bcat(sb, &structsize, sizeof(structsize));
2429 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize),
2432 sect_len = sbuf_end_section(sb, start_len, 0, 0);
2437 KASSERT(sect_sz <= *sizep,
2438 ("kern_proc_filedesc_out did not respect maxlen; "
2439 "requested %zu, got %zu", *sizep - sizeof(structsize),
2440 sect_sz - sizeof(structsize)));
2442 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++)
2447 #ifdef KINFO_VMENTRY_SIZE
2448 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE);
2452 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep)
2456 int structsize, vmmap_flags;
2458 if (coredump_pack_vmmapinfo)
2459 vmmap_flags = KERN_VMMAP_PACK_KINFO;
2463 p = (struct proc *)arg;
2464 structsize = sizeof(struct kinfo_vmentry);
2467 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2468 sbuf_set_drain(sb, sbuf_count_drain, &size);
2469 sbuf_bcat(sb, &structsize, sizeof(structsize));
2471 kern_proc_vmmap_out(p, sb, -1, vmmap_flags);
2476 sbuf_bcat(sb, &structsize, sizeof(structsize));
2478 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize),
2484 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep)
2490 p = (struct proc *)arg;
2491 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t);
2493 KASSERT(*sizep == size, ("invalid size"));
2494 structsize = sizeof(gid_t);
2495 sbuf_bcat(sb, &structsize, sizeof(structsize));
2496 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups *
2503 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep)
2509 p = (struct proc *)arg;
2510 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask);
2512 KASSERT(*sizep == size, ("invalid size"));
2513 structsize = sizeof(p->p_fd->fd_cmask);
2514 sbuf_bcat(sb, &structsize, sizeof(structsize));
2515 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask));
2521 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep)
2524 struct rlimit rlim[RLIM_NLIMITS];
2528 p = (struct proc *)arg;
2529 size = sizeof(structsize) + sizeof(rlim);
2531 KASSERT(*sizep == size, ("invalid size"));
2532 structsize = sizeof(rlim);
2533 sbuf_bcat(sb, &structsize, sizeof(structsize));
2535 for (i = 0; i < RLIM_NLIMITS; i++)
2536 lim_rlimit_proc(p, i, &rlim[i]);
2538 sbuf_bcat(sb, rlim, sizeof(rlim));
2544 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep)
2550 p = (struct proc *)arg;
2551 size = sizeof(structsize) + sizeof(p->p_osrel);
2553 KASSERT(*sizep == size, ("invalid size"));
2554 structsize = sizeof(p->p_osrel);
2555 sbuf_bcat(sb, &structsize, sizeof(structsize));
2556 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel));
2562 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep)
2565 elf_ps_strings_t ps_strings;
2569 p = (struct proc *)arg;
2570 size = sizeof(structsize) + sizeof(ps_strings);
2572 KASSERT(*sizep == size, ("invalid size"));
2573 structsize = sizeof(ps_strings);
2574 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2575 ps_strings = PTROUT(p->p_sysent->sv_psstrings);
2577 ps_strings = p->p_sysent->sv_psstrings;
2579 sbuf_bcat(sb, &structsize, sizeof(structsize));
2580 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings));
2586 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep)
2592 p = (struct proc *)arg;
2595 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2596 sbuf_set_drain(sb, sbuf_count_drain, &size);
2597 sbuf_bcat(sb, &structsize, sizeof(structsize));
2599 proc_getauxv(curthread, p, sb);
2605 structsize = sizeof(Elf_Auxinfo);
2606 sbuf_bcat(sb, &structsize, sizeof(structsize));
2608 proc_getauxv(curthread, p, sb);
2614 __elfN(parse_notes)(struct image_params *imgp, Elf_Note *checknote,
2615 const char *note_vendor, const Elf_Phdr *pnote,
2616 boolean_t (*cb)(const Elf_Note *, void *, boolean_t *), void *cb_arg)
2618 const Elf_Note *note, *note0, *note_end;
2619 const char *note_name;
2624 /* We need some limit, might as well use PAGE_SIZE. */
2625 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE)
2627 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes");
2628 if (pnote->p_offset > PAGE_SIZE ||
2629 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) {
2630 buf = malloc(pnote->p_filesz, M_TEMP, M_NOWAIT);
2632 VOP_UNLOCK(imgp->vp);
2633 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK);
2634 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
2636 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz,
2637 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED,
2638 curthread->td_ucred, NOCRED, NULL, curthread);
2640 uprintf("i/o error PT_NOTE\n");
2643 note = note0 = (const Elf_Note *)buf;
2644 note_end = (const Elf_Note *)(buf + pnote->p_filesz);
2646 note = note0 = (const Elf_Note *)(imgp->image_header +
2648 note_end = (const Elf_Note *)(imgp->image_header +
2649 pnote->p_offset + pnote->p_filesz);
2652 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) {
2653 if (!aligned(note, Elf32_Addr) || (const char *)note_end -
2654 (const char *)note < sizeof(Elf_Note)) {
2657 if (note->n_namesz != checknote->n_namesz ||
2658 note->n_descsz != checknote->n_descsz ||
2659 note->n_type != checknote->n_type)
2661 note_name = (const char *)(note + 1);
2662 if (note_name + checknote->n_namesz >=
2663 (const char *)note_end || strncmp(note_vendor,
2664 note_name, checknote->n_namesz) != 0)
2667 if (cb(note, cb_arg, &res))
2670 note = (const Elf_Note *)((const char *)(note + 1) +
2671 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) +
2672 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE));
2681 struct brandnote_cb_arg {
2682 Elf_Brandnote *brandnote;
2687 brandnote_cb(const Elf_Note *note, void *arg0, boolean_t *res)
2689 struct brandnote_cb_arg *arg;
2694 * Fetch the osreldate for binary from the ELF OSABI-note if
2697 *res = (arg->brandnote->flags & BN_TRANSLATE_OSREL) != 0 &&
2698 arg->brandnote->trans_osrel != NULL ?
2699 arg->brandnote->trans_osrel(note, arg->osrel) : TRUE;
2704 static Elf_Note fctl_note = {
2705 .n_namesz = sizeof(FREEBSD_ABI_VENDOR),
2706 .n_descsz = sizeof(uint32_t),
2707 .n_type = NT_FREEBSD_FEATURE_CTL,
2710 struct fctl_cb_arg {
2711 boolean_t *has_fctl0;
2716 note_fctl_cb(const Elf_Note *note, void *arg0, boolean_t *res)
2718 struct fctl_cb_arg *arg;
2719 const Elf32_Word *desc;
2723 p = (uintptr_t)(note + 1);
2724 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
2725 desc = (const Elf32_Word *)p;
2726 *arg->has_fctl0 = TRUE;
2727 *arg->fctl0 = desc[0];
2732 * Try to find the appropriate ABI-note section for checknote, fetch
2733 * the osreldate and feature control flags for binary from the ELF
2734 * OSABI-note. Only the first page of the image is searched, the same
2738 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *brandnote,
2739 int32_t *osrel, boolean_t *has_fctl0, uint32_t *fctl0)
2741 const Elf_Phdr *phdr;
2742 const Elf_Ehdr *hdr;
2743 struct brandnote_cb_arg b_arg;
2744 struct fctl_cb_arg f_arg;
2747 hdr = (const Elf_Ehdr *)imgp->image_header;
2748 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
2749 b_arg.brandnote = brandnote;
2750 b_arg.osrel = osrel;
2751 f_arg.has_fctl0 = has_fctl0;
2752 f_arg.fctl0 = fctl0;
2754 for (i = 0; i < hdr->e_phnum; i++) {
2755 if (phdr[i].p_type == PT_NOTE && __elfN(parse_notes)(imgp,
2756 &brandnote->hdr, brandnote->vendor, &phdr[i], brandnote_cb,
2758 for (j = 0; j < hdr->e_phnum; j++) {
2759 if (phdr[j].p_type == PT_NOTE &&
2760 __elfN(parse_notes)(imgp, &fctl_note,
2761 FREEBSD_ABI_VENDOR, &phdr[j],
2762 note_fctl_cb, &f_arg))
2773 * Tell kern_execve.c about it, with a little help from the linker.
2775 static struct execsw __elfN(execsw) = {
2776 .ex_imgact = __CONCAT(exec_, __elfN(imgact)),
2777 .ex_name = __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
2779 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
2782 __elfN(trans_prot)(Elf_Word flags)
2788 prot |= VM_PROT_EXECUTE;
2790 prot |= VM_PROT_WRITE;
2792 prot |= VM_PROT_READ;
2793 #if __ELF_WORD_SIZE == 32 && (defined(__amd64__) || defined(__i386__))
2794 if (i386_read_exec && (flags & PF_R))
2795 prot |= VM_PROT_EXECUTE;
2801 __elfN(untrans_prot)(vm_prot_t prot)
2806 if (prot & VM_PROT_EXECUTE)
2808 if (prot & VM_PROT_READ)
2810 if (prot & VM_PROT_WRITE)
2816 __elfN(stackgap)(struct image_params *imgp, uintptr_t *stack_base)
2818 uintptr_t range, rbase, gap;
2821 if ((imgp->map_flags & MAP_ASLR) == 0)
2823 pct = __elfN(aslr_stack_gap);
2828 range = imgp->eff_stack_sz * pct / 100;
2829 arc4rand(&rbase, sizeof(rbase), 0);
2830 gap = rbase % range;
2831 gap &= ~(sizeof(u_long) - 1);