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, int interp_name_len, 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 int interp_name_len, int32_t *osrel, uint32_t *fctl0)
277 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
278 Elf_Brandinfo *bi, *bi_m;
283 * We support four types of branding -- (1) the ELF EI_OSABI field
284 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
285 * branding w/in the ELF header, (3) path of the `interp_path'
286 * field, and (4) the ".note.ABI-tag" ELF section.
289 /* Look for an ".note.ABI-tag" ELF section */
291 for (i = 0; i < MAX_BRANDS; i++) {
292 bi = elf_brand_list[i];
295 if (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)
297 if (hdr->e_machine == bi->machine && (bi->flags &
298 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
299 ret = __elfN(check_note)(imgp, bi->brand_note, osrel,
301 /* Give brand a chance to veto check_note's guess */
302 if (ret && bi->header_supported)
303 ret = bi->header_supported(imgp);
305 * If note checker claimed the binary, but the
306 * interpreter path in the image does not
307 * match default one for the brand, try to
308 * search for other brands with the same
309 * interpreter. Either there is better brand
310 * with the right interpreter, or, failing
311 * this, we return first brand which accepted
312 * our note and, optionally, header.
314 if (ret && bi_m == NULL && interp != NULL &&
315 (bi->interp_path == NULL ||
316 (strlen(bi->interp_path) + 1 != interp_name_len ||
317 strncmp(interp, bi->interp_path, interp_name_len)
329 /* If the executable has a brand, search for it in the brand list. */
330 for (i = 0; i < MAX_BRANDS; i++) {
331 bi = elf_brand_list[i];
332 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 ||
333 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0))
335 if (hdr->e_machine == bi->machine &&
336 (hdr->e_ident[EI_OSABI] == bi->brand ||
337 (bi->compat_3_brand != NULL &&
338 strcmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
339 bi->compat_3_brand) == 0))) {
340 /* Looks good, but give brand a chance to veto */
341 if (bi->header_supported == NULL ||
342 bi->header_supported(imgp)) {
344 * Again, prefer strictly matching
347 if (interp_name_len == 0 &&
348 bi->interp_path == NULL)
350 if (bi->interp_path != NULL &&
351 strlen(bi->interp_path) + 1 ==
352 interp_name_len && strncmp(interp,
353 bi->interp_path, interp_name_len) == 0)
363 /* No known brand, see if the header is recognized by any brand */
364 for (i = 0; i < MAX_BRANDS; i++) {
365 bi = elf_brand_list[i];
366 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY ||
367 bi->header_supported == NULL)
369 if (hdr->e_machine == bi->machine) {
370 ret = bi->header_supported(imgp);
376 /* Lacking a known brand, search for a recognized interpreter. */
377 if (interp != NULL) {
378 for (i = 0; i < MAX_BRANDS; i++) {
379 bi = elf_brand_list[i];
380 if (bi == NULL || (bi->flags &
381 (BI_BRAND_NOTE_MANDATORY | BI_BRAND_ONLY_STATIC))
384 if (hdr->e_machine == bi->machine &&
385 bi->interp_path != NULL &&
386 /* ELF image p_filesz includes terminating zero */
387 strlen(bi->interp_path) + 1 == interp_name_len &&
388 strncmp(interp, bi->interp_path, interp_name_len)
389 == 0 && (bi->header_supported == NULL ||
390 bi->header_supported(imgp)))
395 /* Lacking a recognized interpreter, try the default brand */
396 for (i = 0; i < MAX_BRANDS; i++) {
397 bi = elf_brand_list[i];
398 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 ||
399 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0))
401 if (hdr->e_machine == bi->machine &&
402 __elfN(fallback_brand) == bi->brand &&
403 (bi->header_supported == NULL ||
404 bi->header_supported(imgp)))
411 __elfN(check_header)(const Elf_Ehdr *hdr)
417 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
418 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
419 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
420 hdr->e_phentsize != sizeof(Elf_Phdr) ||
421 hdr->e_version != ELF_TARG_VER)
425 * Make sure we have at least one brand for this machine.
428 for (i = 0; i < MAX_BRANDS; i++) {
429 bi = elf_brand_list[i];
430 if (bi != NULL && bi->machine == hdr->e_machine)
440 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
441 vm_offset_t start, vm_offset_t end, vm_prot_t prot)
448 * Create the page if it doesn't exist yet. Ignore errors.
450 vm_map_fixed(map, NULL, 0, trunc_page(start), round_page(end) -
451 trunc_page(start), VM_PROT_ALL, VM_PROT_ALL, MAP_CHECK_EXCL);
454 * Find the page from the underlying object.
456 if (object != NULL) {
457 sf = vm_imgact_map_page(object, offset);
459 return (KERN_FAILURE);
460 off = offset - trunc_page(offset);
461 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start,
463 vm_imgact_unmap_page(sf);
465 return (KERN_FAILURE);
468 return (KERN_SUCCESS);
472 __elfN(map_insert)(struct image_params *imgp, vm_map_t map, vm_object_t object,
473 vm_ooffset_t offset, vm_offset_t start, vm_offset_t end, vm_prot_t prot,
479 int error, locked, rv;
481 if (start != trunc_page(start)) {
482 rv = __elfN(map_partial)(map, object, offset, start,
483 round_page(start), prot);
484 if (rv != KERN_SUCCESS)
486 offset += round_page(start) - start;
487 start = round_page(start);
489 if (end != round_page(end)) {
490 rv = __elfN(map_partial)(map, object, offset +
491 trunc_page(end) - start, trunc_page(end), end, prot);
492 if (rv != KERN_SUCCESS)
494 end = trunc_page(end);
497 return (KERN_SUCCESS);
498 if ((offset & PAGE_MASK) != 0) {
500 * The mapping is not page aligned. This means that we have
503 rv = vm_map_fixed(map, NULL, 0, start, end - start,
504 prot | VM_PROT_WRITE, VM_PROT_ALL, MAP_CHECK_EXCL);
505 if (rv != KERN_SUCCESS)
508 return (KERN_SUCCESS);
509 for (; start < end; start += sz) {
510 sf = vm_imgact_map_page(object, offset);
512 return (KERN_FAILURE);
513 off = offset - trunc_page(offset);
515 if (sz > PAGE_SIZE - off)
516 sz = PAGE_SIZE - off;
517 error = copyout((caddr_t)sf_buf_kva(sf) + off,
519 vm_imgact_unmap_page(sf);
521 return (KERN_FAILURE);
525 vm_object_reference(object);
526 rv = vm_map_fixed(map, object, offset, start, end - start,
527 prot, VM_PROT_ALL, cow | MAP_CHECK_EXCL);
528 if (rv != KERN_SUCCESS) {
529 locked = VOP_ISLOCKED(imgp->vp);
530 VOP_UNLOCK(imgp->vp, 0);
531 vm_object_deallocate(object);
532 vn_lock(imgp->vp, locked | LK_RETRY);
536 return (KERN_SUCCESS);
540 __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset,
541 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot)
547 vm_offset_t off, map_addr;
550 vm_ooffset_t file_addr;
553 * It's necessary to fail if the filsz + offset taken from the
554 * header is greater than the actual file pager object's size.
555 * If we were to allow this, then the vm_map_find() below would
556 * walk right off the end of the file object and into the ether.
558 * While I'm here, might as well check for something else that
559 * is invalid: filsz cannot be greater than memsz.
561 if ((filsz != 0 && (off_t)filsz + offset > imgp->attr->va_size) ||
563 uprintf("elf_load_section: truncated ELF file\n");
567 object = imgp->object;
568 map = &imgp->proc->p_vmspace->vm_map;
569 map_addr = trunc_page((vm_offset_t)vmaddr);
570 file_addr = trunc_page(offset);
573 * We have two choices. We can either clear the data in the last page
574 * of an oversized mapping, or we can start the anon mapping a page
575 * early and copy the initialized data into that first page. We
580 else if (memsz > filsz)
581 map_len = trunc_page(offset + filsz) - file_addr;
583 map_len = round_page(offset + filsz) - file_addr;
586 /* cow flags: don't dump readonly sections in core */
587 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
588 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
590 rv = __elfN(map_insert)(imgp, map,
592 file_addr, /* file offset */
593 map_addr, /* virtual start */
594 map_addr + map_len,/* virtual end */
597 if (rv != KERN_SUCCESS)
600 /* we can stop now if we've covered it all */
607 * We have to get the remaining bit of the file into the first part
608 * of the oversized map segment. This is normally because the .data
609 * segment in the file is extended to provide bss. It's a neat idea
610 * to try and save a page, but it's a pain in the behind to implement.
612 copy_len = filsz == 0 ? 0 : (offset + filsz) - trunc_page(offset +
614 map_addr = trunc_page((vm_offset_t)vmaddr + filsz);
615 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr;
617 /* This had damn well better be true! */
619 rv = __elfN(map_insert)(imgp, map, NULL, 0, map_addr,
620 map_addr + map_len, prot, 0);
621 if (rv != KERN_SUCCESS)
626 sf = vm_imgact_map_page(object, offset + filsz);
630 /* send the page fragment to user space */
631 off = trunc_page(offset + filsz) - trunc_page(offset + filsz);
632 error = copyout((caddr_t)sf_buf_kva(sf) + off,
633 (caddr_t)map_addr, copy_len);
634 vm_imgact_unmap_page(sf);
640 * Remove write access to the page if it was only granted by map_insert
643 if ((prot & VM_PROT_WRITE) == 0)
644 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr +
645 map_len), prot, FALSE);
651 * Load the file "file" into memory. It may be either a shared object
654 * The "addr" reference parameter is in/out. On entry, it specifies
655 * the address where a shared object should be loaded. If the file is
656 * an executable, this value is ignored. On exit, "addr" specifies
657 * where the file was actually loaded.
659 * The "entry" reference parameter is out only. On exit, it specifies
660 * the entry point for the loaded file.
663 __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
669 struct image_params image_params;
671 const Elf_Ehdr *hdr = NULL;
672 const Elf_Phdr *phdr = NULL;
673 struct nameidata *nd;
675 struct image_params *imgp;
678 u_long base_addr = 0;
679 int error, i, numsegs;
681 #ifdef CAPABILITY_MODE
683 * XXXJA: This check can go away once we are sufficiently confident
684 * that the checks in namei() are correct.
686 if (IN_CAPABILITY_MODE(curthread))
690 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
692 attr = &tempdata->attr;
693 imgp = &tempdata->image_params;
696 * Initialize part of the common data
700 imgp->firstpage = NULL;
701 imgp->image_header = NULL;
703 imgp->execlabel = NULL;
705 NDINIT(nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, curthread);
706 if ((error = namei(nd)) != 0) {
710 NDFREE(nd, NDF_ONLY_PNBUF);
711 imgp->vp = nd->ni_vp;
714 * Check permissions, modes, uid, etc on the file, and "open" it.
716 error = exec_check_permissions(imgp);
720 error = exec_map_first_page(imgp);
725 * Also make certain that the interpreter stays the same, so set
726 * its VV_TEXT flag, too.
728 VOP_SET_TEXT(nd->ni_vp);
730 imgp->object = nd->ni_vp->v_object;
732 hdr = (const Elf_Ehdr *)imgp->image_header;
733 if ((error = __elfN(check_header)(hdr)) != 0)
735 if (hdr->e_type == ET_DYN)
737 else if (hdr->e_type == ET_EXEC)
744 /* Only support headers that fit within first page for now */
745 if ((hdr->e_phoff > PAGE_SIZE) ||
746 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
751 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
752 if (!aligned(phdr, Elf_Addr)) {
757 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
758 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) {
759 /* Loadable segment */
760 prot = __elfN(trans_prot)(phdr[i].p_flags);
761 error = __elfN(load_section)(imgp, phdr[i].p_offset,
762 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase,
763 phdr[i].p_memsz, phdr[i].p_filesz, prot);
767 * Establish the base address if this is the
771 base_addr = trunc_page(phdr[i].p_vaddr +
777 *entry = (unsigned long)hdr->e_entry + rbase;
781 exec_unmap_first_page(imgp);
786 free(tempdata, M_TEMP);
792 __CONCAT(rnd_, __elfN(base))(vm_map_t map __unused, u_long minv, u_long maxv,
797 MPASS(vm_map_min(map) <= minv);
798 MPASS(maxv <= vm_map_max(map));
800 MPASS(minv + align < maxv);
801 arc4rand(&rbase, sizeof(rbase), 0);
802 res = roundup(minv, (u_long)align) + rbase % (maxv - minv);
803 res &= ~((u_long)align - 1);
807 ("res %#lx < minv %#lx, maxv %#lx rbase %#lx",
808 res, minv, maxv, rbase));
810 ("res %#lx > maxv %#lx, minv %#lx rbase %#lx",
811 res, maxv, minv, rbase));
816 * Impossible et_dyn_addr initial value indicating that the real base
817 * must be calculated later with some randomization applied.
819 #define ET_DYN_ADDR_RAND 1
822 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
826 const Elf_Phdr *phdr;
827 Elf_Auxargs *elf_auxargs;
828 struct vmspace *vmspace;
830 const char *err_str, *newinterp;
831 char *interp, *interp_buf, *path;
832 Elf_Brandinfo *brand_info;
833 struct sysentvec *sv;
835 u_long text_size, data_size, total_size, text_addr, data_addr;
836 u_long seg_size, seg_addr, addr, baddr, et_dyn_addr, entry, proghdr;
837 u_long maxalign, mapsz, maxv, maxv1;
840 int error, i, n, interp_name_len, have_interp;
842 hdr = (const Elf_Ehdr *)imgp->image_header;
845 * Do we have a valid ELF header ?
847 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later
848 * if particular brand doesn't support it.
850 if (__elfN(check_header)(hdr) != 0 ||
851 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
855 * From here on down, we return an errno, not -1, as we've
856 * detected an ELF file.
859 if ((hdr->e_phoff > PAGE_SIZE) ||
860 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
861 /* Only support headers in first page for now */
862 uprintf("Program headers not in the first page\n");
865 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
866 if (!aligned(phdr, Elf_Addr)) {
867 uprintf("Unaligned program headers\n");
875 text_size = data_size = total_size = text_addr = data_addr = 0;
878 err_str = newinterp = NULL;
879 interp = interp_buf = NULL;
881 maxalign = PAGE_SIZE;
884 for (i = 0; i < hdr->e_phnum; i++) {
885 switch (phdr[i].p_type) {
888 baddr = phdr[i].p_vaddr;
889 if (phdr[i].p_align > maxalign)
890 maxalign = phdr[i].p_align;
891 mapsz += phdr[i].p_memsz;
895 /* Path to interpreter */
896 if (phdr[i].p_filesz < 2 ||
897 phdr[i].p_filesz > MAXPATHLEN) {
898 uprintf("Invalid PT_INTERP\n");
902 if (interp != NULL) {
903 uprintf("Multiple PT_INTERP headers\n");
907 interp_name_len = phdr[i].p_filesz;
908 if (phdr[i].p_offset > PAGE_SIZE ||
909 interp_name_len > PAGE_SIZE - phdr[i].p_offset) {
910 VOP_UNLOCK(imgp->vp, 0);
911 interp_buf = malloc(interp_name_len + 1, M_TEMP,
913 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
914 error = vn_rdwr(UIO_READ, imgp->vp, interp_buf,
915 interp_name_len, phdr[i].p_offset,
916 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
919 uprintf("i/o error PT_INTERP %d\n",
923 interp_buf[interp_name_len] = '\0';
926 interp = __DECONST(char *, imgp->image_header) +
928 if (interp[interp_name_len - 1] != '\0') {
929 uprintf("Invalid PT_INTERP\n");
938 __elfN(trans_prot)(phdr[i].p_flags);
939 imgp->stack_sz = phdr[i].p_memsz;
944 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len,
946 if (brand_info == NULL) {
947 uprintf("ELF binary type \"%u\" not known.\n",
948 hdr->e_ident[EI_OSABI]);
952 sv = brand_info->sysvec;
954 if (hdr->e_type == ET_DYN) {
955 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) {
956 uprintf("Cannot execute shared object\n");
961 * Honour the base load address from the dso if it is
962 * non-zero for some reason.
965 if ((sv->sv_flags & SV_ASLR) == 0 ||
966 (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0)
967 et_dyn_addr = ET_DYN_LOAD_ADDR;
968 else if ((__elfN(pie_aslr_enabled) &&
969 (imgp->proc->p_flag2 & P2_ASLR_DISABLE) == 0) ||
970 (imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0)
971 et_dyn_addr = ET_DYN_ADDR_RAND;
973 et_dyn_addr = ET_DYN_LOAD_ADDR;
976 if (interp != NULL && brand_info->interp_newpath != NULL)
977 newinterp = brand_info->interp_newpath;
980 * Avoid a possible deadlock if the current address space is destroyed
981 * and that address space maps the locked vnode. In the common case,
982 * the locked vnode's v_usecount is decremented but remains greater
983 * than zero. Consequently, the vnode lock is not needed by vrele().
984 * However, in cases where the vnode lock is external, such as nullfs,
985 * v_usecount may become zero.
987 * The VV_TEXT flag prevents modifications to the executable while
988 * the vnode is unlocked.
990 VOP_UNLOCK(imgp->vp, 0);
993 * Decide whether to enable randomization of user mappings.
994 * First, reset user preferences for the setid binaries.
995 * Then, account for the support of the randomization by the
996 * ABI, by user preferences, and make special treatment for
999 if (imgp->credential_setid) {
1000 PROC_LOCK(imgp->proc);
1001 imgp->proc->p_flag2 &= ~(P2_ASLR_ENABLE | P2_ASLR_DISABLE);
1002 PROC_UNLOCK(imgp->proc);
1004 if ((sv->sv_flags & SV_ASLR) == 0 ||
1005 (imgp->proc->p_flag2 & P2_ASLR_DISABLE) != 0 ||
1006 (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0) {
1007 KASSERT(et_dyn_addr != ET_DYN_ADDR_RAND,
1008 ("et_dyn_addr == RAND and !ASLR"));
1009 } else if ((imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0 ||
1010 (__elfN(aslr_enabled) && hdr->e_type == ET_EXEC) ||
1011 et_dyn_addr == ET_DYN_ADDR_RAND) {
1012 imgp->map_flags |= MAP_ASLR;
1014 * If user does not care about sbrk, utilize the bss
1015 * grow region for mappings as well. We can select
1016 * the base for the image anywere and still not suffer
1017 * from the fragmentation.
1019 if (!__elfN(aslr_honor_sbrk) ||
1020 (imgp->proc->p_flag2 & P2_ASLR_IGNSTART) != 0)
1021 imgp->map_flags |= MAP_ASLR_IGNSTART;
1024 error = exec_new_vmspace(imgp, sv);
1025 vmspace = imgp->proc->p_vmspace;
1026 map = &vmspace->vm_map;
1028 imgp->proc->p_sysent = sv;
1030 maxv = vm_map_max(map) - lim_max(td, RLIMIT_STACK);
1031 if (et_dyn_addr == ET_DYN_ADDR_RAND) {
1032 KASSERT((map->flags & MAP_ASLR) != 0,
1033 ("ET_DYN_ADDR_RAND but !MAP_ASLR"));
1034 et_dyn_addr = __CONCAT(rnd_, __elfN(base))(map,
1035 vm_map_min(map) + mapsz + lim_max(td, RLIMIT_DATA),
1036 /* reserve half of the address space to interpreter */
1037 maxv / 2, 1UL << flsl(maxalign));
1040 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
1044 for (i = 0; i < hdr->e_phnum; i++) {
1045 switch (phdr[i].p_type) {
1046 case PT_LOAD: /* Loadable segment */
1047 if (phdr[i].p_memsz == 0)
1049 prot = __elfN(trans_prot)(phdr[i].p_flags);
1050 error = __elfN(load_section)(imgp, phdr[i].p_offset,
1051 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr,
1052 phdr[i].p_memsz, phdr[i].p_filesz, prot);
1057 * If this segment contains the program headers,
1058 * remember their virtual address for the AT_PHDR
1059 * aux entry. Static binaries don't usually include
1062 if (phdr[i].p_offset == 0 &&
1063 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize
1064 <= phdr[i].p_filesz)
1065 proghdr = phdr[i].p_vaddr + hdr->e_phoff +
1068 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
1069 seg_size = round_page(phdr[i].p_memsz +
1070 phdr[i].p_vaddr + et_dyn_addr - seg_addr);
1073 * Make the largest executable segment the official
1074 * text segment and all others data.
1076 * Note that obreak() assumes that data_addr +
1077 * data_size == end of data load area, and the ELF
1078 * file format expects segments to be sorted by
1079 * address. If multiple data segments exist, the
1080 * last one will be used.
1083 if (phdr[i].p_flags & PF_X && text_size < seg_size) {
1084 text_size = seg_size;
1085 text_addr = seg_addr;
1087 data_size = seg_size;
1088 data_addr = seg_addr;
1090 total_size += seg_size;
1092 case PT_PHDR: /* Program header table info */
1093 proghdr = phdr[i].p_vaddr + et_dyn_addr;
1100 if (data_addr == 0 && data_size == 0) {
1101 data_addr = text_addr;
1102 data_size = text_size;
1105 entry = (u_long)hdr->e_entry + et_dyn_addr;
1108 * Check limits. It should be safe to check the
1109 * limits after loading the segments since we do
1110 * not actually fault in all the segments pages.
1112 PROC_LOCK(imgp->proc);
1113 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA))
1114 err_str = "Data segment size exceeds process limit";
1115 else if (text_size > maxtsiz)
1116 err_str = "Text segment size exceeds system limit";
1117 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM))
1118 err_str = "Total segment size exceeds process limit";
1119 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0)
1120 err_str = "Data segment size exceeds resource limit";
1121 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0)
1122 err_str = "Total segment size exceeds resource limit";
1123 if (err_str != NULL) {
1124 PROC_UNLOCK(imgp->proc);
1125 uprintf("%s\n", err_str);
1130 vmspace->vm_tsize = text_size >> PAGE_SHIFT;
1131 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
1132 vmspace->vm_dsize = data_size >> PAGE_SHIFT;
1133 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
1136 * We load the dynamic linker where a userland call
1137 * to mmap(0, ...) would put it. The rationale behind this
1138 * calculation is that it leaves room for the heap to grow to
1139 * its maximum allowed size.
1141 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td,
1143 if ((map->flags & MAP_ASLR) != 0) {
1144 maxv1 = maxv / 2 + addr / 2;
1145 MPASS(maxv1 >= addr); /* No overflow */
1146 map->anon_loc = __CONCAT(rnd_, __elfN(base))(map, addr, maxv1,
1147 MAXPAGESIZES > 1 ? pagesizes[1] : pagesizes[0]);
1149 map->anon_loc = addr;
1151 PROC_UNLOCK(imgp->proc);
1153 imgp->entry_addr = entry;
1155 if (interp != NULL) {
1156 have_interp = FALSE;
1157 VOP_UNLOCK(imgp->vp, 0);
1158 if ((map->flags & MAP_ASLR) != 0) {
1159 /* Assume that interpeter fits into 1/4 of AS */
1160 maxv1 = maxv / 2 + addr / 2;
1161 MPASS(maxv1 >= addr); /* No overflow */
1162 addr = __CONCAT(rnd_, __elfN(base))(map, addr,
1165 if (brand_info->emul_path != NULL &&
1166 brand_info->emul_path[0] != '\0') {
1167 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1168 snprintf(path, MAXPATHLEN, "%s%s",
1169 brand_info->emul_path, interp);
1170 error = __elfN(load_file)(imgp->proc, path, &addr,
1176 if (!have_interp && newinterp != NULL &&
1177 (brand_info->interp_path == NULL ||
1178 strcmp(interp, brand_info->interp_path) == 0)) {
1179 error = __elfN(load_file)(imgp->proc, newinterp, &addr,
1185 error = __elfN(load_file)(imgp->proc, interp, &addr,
1188 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
1190 uprintf("ELF interpreter %s not found, error %d\n",
1198 * Construct auxargs table (used by the fixup routine)
1200 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
1201 elf_auxargs->execfd = -1;
1202 elf_auxargs->phdr = proghdr;
1203 elf_auxargs->phent = hdr->e_phentsize;
1204 elf_auxargs->phnum = hdr->e_phnum;
1205 elf_auxargs->pagesz = PAGE_SIZE;
1206 elf_auxargs->base = addr;
1207 elf_auxargs->flags = 0;
1208 elf_auxargs->entry = entry;
1209 elf_auxargs->hdr_eflags = hdr->e_flags;
1211 imgp->auxargs = elf_auxargs;
1212 imgp->interpreted = 0;
1213 imgp->reloc_base = addr;
1214 imgp->proc->p_osrel = osrel;
1215 imgp->proc->p_fctl0 = fctl0;
1216 imgp->proc->p_elf_machine = hdr->e_machine;
1217 imgp->proc->p_elf_flags = hdr->e_flags;
1220 free(interp_buf, M_TEMP);
1224 #define suword __CONCAT(suword, __ELF_WORD_SIZE)
1227 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp)
1229 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
1230 Elf_Auxinfo *argarray, *pos;
1231 Elf_Addr *base, *auxbase;
1234 base = (Elf_Addr *)*stack_base;
1235 auxbase = base + imgp->args->argc + 1 + imgp->args->envc + 1;
1236 argarray = pos = malloc(AT_COUNT * sizeof(*pos), M_TEMP,
1239 if (args->execfd != -1)
1240 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
1241 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
1242 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
1243 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
1244 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
1245 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
1246 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
1247 AUXARGS_ENTRY(pos, AT_BASE, args->base);
1248 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags);
1249 if (imgp->execpathp != 0)
1250 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp);
1251 AUXARGS_ENTRY(pos, AT_OSRELDATE,
1252 imgp->proc->p_ucred->cr_prison->pr_osreldate);
1253 if (imgp->canary != 0) {
1254 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary);
1255 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen);
1257 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus);
1258 if (imgp->pagesizes != 0) {
1259 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes);
1260 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen);
1262 if (imgp->sysent->sv_timekeep_base != 0) {
1263 AUXARGS_ENTRY(pos, AT_TIMEKEEP,
1264 imgp->sysent->sv_timekeep_base);
1266 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj
1267 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot :
1268 imgp->sysent->sv_stackprot);
1269 if (imgp->sysent->sv_hwcap != NULL)
1270 AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap);
1271 if (imgp->sysent->sv_hwcap2 != NULL)
1272 AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2);
1273 AUXARGS_ENTRY(pos, AT_NULL, 0);
1275 free(imgp->auxargs, M_TEMP);
1276 imgp->auxargs = NULL;
1277 KASSERT(pos - argarray <= AT_COUNT, ("Too many auxargs"));
1279 error = copyout(argarray, auxbase, sizeof(*argarray) * AT_COUNT);
1280 free(argarray, M_TEMP);
1285 if (suword(base, imgp->args->argc) == -1)
1287 *stack_base = (register_t *)base;
1292 * Code for generating ELF core dumps.
1295 typedef void (*segment_callback)(vm_map_entry_t, void *);
1297 /* Closure for cb_put_phdr(). */
1298 struct phdr_closure {
1299 Elf_Phdr *phdr; /* Program header to fill in */
1300 Elf_Off offset; /* Offset of segment in core file */
1303 /* Closure for cb_size_segment(). */
1304 struct sseg_closure {
1305 int count; /* Count of writable segments. */
1306 size_t size; /* Total size of all writable segments. */
1309 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *);
1312 int type; /* Note type. */
1313 outfunc_t outfunc; /* Output function. */
1314 void *outarg; /* Argument for the output function. */
1315 size_t outsize; /* Output size. */
1316 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */
1319 TAILQ_HEAD(note_info_list, note_info);
1321 /* Coredump output parameters. */
1322 struct coredump_params {
1324 struct ucred *active_cred;
1325 struct ucred *file_cred;
1328 struct compressor *comp;
1331 extern int compress_user_cores;
1332 extern int compress_user_cores_level;
1334 static void cb_put_phdr(vm_map_entry_t, void *);
1335 static void cb_size_segment(vm_map_entry_t, void *);
1336 static int core_write(struct coredump_params *, const void *, size_t, off_t,
1338 static void each_dumpable_segment(struct thread *, segment_callback, void *);
1339 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t,
1340 struct note_info_list *, size_t);
1341 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *,
1343 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t);
1344 static void __elfN(putnote)(struct note_info *, struct sbuf *);
1345 static size_t register_note(struct note_info_list *, int, outfunc_t, void *);
1346 static int sbuf_drain_core_output(void *, const char *, int);
1347 static int sbuf_drain_count(void *arg, const char *data, int len);
1349 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *);
1350 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *);
1351 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *);
1352 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *);
1353 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *);
1354 static void __elfN(note_ptlwpinfo)(void *, struct sbuf *, size_t *);
1355 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *);
1356 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *);
1357 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *);
1358 static void note_procstat_files(void *, struct sbuf *, size_t *);
1359 static void note_procstat_groups(void *, struct sbuf *, size_t *);
1360 static void note_procstat_osrel(void *, struct sbuf *, size_t *);
1361 static void note_procstat_rlimit(void *, struct sbuf *, size_t *);
1362 static void note_procstat_umask(void *, struct sbuf *, size_t *);
1363 static void note_procstat_vmmap(void *, struct sbuf *, size_t *);
1366 * Write out a core segment to the compression stream.
1369 compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len)
1375 chunk_len = MIN(len, CORE_BUF_SIZE);
1378 * We can get EFAULT error here.
1379 * In that case zero out the current chunk of the segment.
1381 error = copyin(base, buf, chunk_len);
1383 bzero(buf, chunk_len);
1384 error = compressor_write(p->comp, buf, chunk_len);
1394 core_compressed_write(void *base, size_t len, off_t offset, void *arg)
1397 return (core_write((struct coredump_params *)arg, base, len, offset,
1402 core_write(struct coredump_params *p, const void *base, size_t len,
1403 off_t offset, enum uio_seg seg)
1406 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, __DECONST(void *, base),
1407 len, offset, seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED,
1408 p->active_cred, p->file_cred, NULL, p->td));
1412 core_output(void *base, size_t len, off_t offset, struct coredump_params *p,
1417 if (p->comp != NULL)
1418 return (compress_chunk(p, base, tmpbuf, len));
1421 * EFAULT is a non-fatal error that we can get, for example,
1422 * if the segment is backed by a file but extends beyond its
1425 error = core_write(p, base, len, offset, UIO_USERSPACE);
1426 if (error == EFAULT) {
1427 log(LOG_WARNING, "Failed to fully fault in a core file segment "
1428 "at VA %p with size 0x%zx to be written at offset 0x%jx "
1429 "for process %s\n", base, len, offset, curproc->p_comm);
1432 * Write a "real" zero byte at the end of the target region
1433 * in the case this is the last segment.
1434 * The intermediate space will be implicitly zero-filled.
1436 error = core_write(p, zero_region, 1, offset + len - 1,
1443 * Drain into a core file.
1446 sbuf_drain_core_output(void *arg, const char *data, int len)
1448 struct coredump_params *p;
1451 p = (struct coredump_params *)arg;
1454 * Some kern_proc out routines that print to this sbuf may
1455 * call us with the process lock held. Draining with the
1456 * non-sleepable lock held is unsafe. The lock is needed for
1457 * those routines when dumping a live process. In our case we
1458 * can safely release the lock before draining and acquire
1461 locked = PROC_LOCKED(p->td->td_proc);
1463 PROC_UNLOCK(p->td->td_proc);
1464 if (p->comp != NULL)
1465 error = compressor_write(p->comp, __DECONST(char *, data), len);
1467 error = core_write(p, __DECONST(void *, data), len, p->offset,
1470 PROC_LOCK(p->td->td_proc);
1478 * Drain into a counter.
1481 sbuf_drain_count(void *arg, const char *data __unused, int len)
1485 sizep = (size_t *)arg;
1491 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags)
1493 struct ucred *cred = td->td_ucred;
1495 struct sseg_closure seginfo;
1496 struct note_info_list notelst;
1497 struct coredump_params params;
1498 struct note_info *ninfo;
1500 size_t hdrsize, notesz, coresize;
1504 TAILQ_INIT(¬elst);
1506 /* Size the program segments. */
1509 each_dumpable_segment(td, cb_size_segment, &seginfo);
1512 * Collect info about the core file header area.
1514 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count);
1515 if (seginfo.count + 1 >= PN_XNUM)
1516 hdrsize += sizeof(Elf_Shdr);
1517 __elfN(prepare_notes)(td, ¬elst, ¬esz);
1518 coresize = round_page(hdrsize + notesz) + seginfo.size;
1520 /* Set up core dump parameters. */
1522 params.active_cred = cred;
1523 params.file_cred = NOCRED;
1530 PROC_LOCK(td->td_proc);
1531 error = racct_add(td->td_proc, RACCT_CORE, coresize);
1532 PROC_UNLOCK(td->td_proc);
1539 if (coresize >= limit) {
1544 /* Create a compression stream if necessary. */
1545 if (compress_user_cores != 0) {
1546 params.comp = compressor_init(core_compressed_write,
1547 compress_user_cores, CORE_BUF_SIZE,
1548 compress_user_cores_level, ¶ms);
1549 if (params.comp == NULL) {
1553 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO);
1557 * Allocate memory for building the header, fill it up,
1558 * and write it out following the notes.
1560 hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
1561 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst,
1564 /* Write the contents of all of the writable segments. */
1570 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
1571 offset = round_page(hdrsize + notesz);
1572 for (i = 0; i < seginfo.count; i++) {
1573 error = core_output((caddr_t)(uintptr_t)php->p_vaddr,
1574 php->p_filesz, offset, ¶ms, tmpbuf);
1577 offset += php->p_filesz;
1580 if (error == 0 && params.comp != NULL)
1581 error = compressor_flush(params.comp);
1585 "Failed to write core file for process %s (error %d)\n",
1586 curproc->p_comm, error);
1590 free(tmpbuf, M_TEMP);
1591 if (params.comp != NULL)
1592 compressor_fini(params.comp);
1593 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) {
1594 TAILQ_REMOVE(¬elst, ninfo, link);
1595 free(ninfo, M_TEMP);
1604 * A callback for each_dumpable_segment() to write out the segment's
1605 * program header entry.
1608 cb_put_phdr(vm_map_entry_t entry, void *closure)
1610 struct phdr_closure *phc = (struct phdr_closure *)closure;
1611 Elf_Phdr *phdr = phc->phdr;
1613 phc->offset = round_page(phc->offset);
1615 phdr->p_type = PT_LOAD;
1616 phdr->p_offset = phc->offset;
1617 phdr->p_vaddr = entry->start;
1619 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1620 phdr->p_align = PAGE_SIZE;
1621 phdr->p_flags = __elfN(untrans_prot)(entry->protection);
1623 phc->offset += phdr->p_filesz;
1628 * A callback for each_dumpable_segment() to gather information about
1629 * the number of segments and their total size.
1632 cb_size_segment(vm_map_entry_t entry, void *closure)
1634 struct sseg_closure *ssc = (struct sseg_closure *)closure;
1637 ssc->size += entry->end - entry->start;
1641 * For each writable segment in the process's memory map, call the given
1642 * function with a pointer to the map entry and some arbitrary
1643 * caller-supplied data.
1646 each_dumpable_segment(struct thread *td, segment_callback func, void *closure)
1648 struct proc *p = td->td_proc;
1649 vm_map_t map = &p->p_vmspace->vm_map;
1650 vm_map_entry_t entry;
1651 vm_object_t backing_object, object;
1652 boolean_t ignore_entry;
1654 vm_map_lock_read(map);
1655 for (entry = map->header.next; entry != &map->header;
1656 entry = entry->next) {
1658 * Don't dump inaccessible mappings, deal with legacy
1661 * Note that read-only segments related to the elf binary
1662 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1663 * need to arbitrarily ignore such segments.
1665 if (elf_legacy_coredump) {
1666 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW)
1669 if ((entry->protection & VM_PROT_ALL) == 0)
1674 * Dont include memory segment in the coredump if
1675 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1676 * madvise(2). Do not dump submaps (i.e. parts of the
1679 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP))
1682 if ((object = entry->object.vm_object) == NULL)
1685 /* Ignore memory-mapped devices and such things. */
1686 VM_OBJECT_RLOCK(object);
1687 while ((backing_object = object->backing_object) != NULL) {
1688 VM_OBJECT_RLOCK(backing_object);
1689 VM_OBJECT_RUNLOCK(object);
1690 object = backing_object;
1692 ignore_entry = object->type != OBJT_DEFAULT &&
1693 object->type != OBJT_SWAP && object->type != OBJT_VNODE &&
1694 object->type != OBJT_PHYS;
1695 VM_OBJECT_RUNLOCK(object);
1699 (*func)(entry, closure);
1701 vm_map_unlock_read(map);
1705 * Write the core file header to the file, including padding up to
1706 * the page boundary.
1709 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr,
1710 size_t hdrsize, struct note_info_list *notelst, size_t notesz)
1712 struct note_info *ninfo;
1716 /* Fill in the header. */
1717 bzero(hdr, hdrsize);
1718 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz);
1720 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN);
1721 sbuf_set_drain(sb, sbuf_drain_core_output, p);
1722 sbuf_start_section(sb, NULL);
1723 sbuf_bcat(sb, hdr, hdrsize);
1724 TAILQ_FOREACH(ninfo, notelst, link)
1725 __elfN(putnote)(ninfo, sb);
1726 /* Align up to a page boundary for the program segments. */
1727 sbuf_end_section(sb, -1, PAGE_SIZE, 0);
1728 error = sbuf_finish(sb);
1735 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list,
1745 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p);
1748 * To have the debugger select the right thread (LWP) as the initial
1749 * thread, we dump the state of the thread passed to us in td first.
1750 * This is the thread that causes the core dump and thus likely to
1751 * be the right thread one wants to have selected in the debugger.
1754 while (thr != NULL) {
1755 size += register_note(list, NT_PRSTATUS,
1756 __elfN(note_prstatus), thr);
1757 size += register_note(list, NT_FPREGSET,
1758 __elfN(note_fpregset), thr);
1759 size += register_note(list, NT_THRMISC,
1760 __elfN(note_thrmisc), thr);
1761 size += register_note(list, NT_PTLWPINFO,
1762 __elfN(note_ptlwpinfo), thr);
1763 size += register_note(list, -1,
1764 __elfN(note_threadmd), thr);
1766 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) :
1767 TAILQ_NEXT(thr, td_plist);
1769 thr = TAILQ_NEXT(thr, td_plist);
1772 size += register_note(list, NT_PROCSTAT_PROC,
1773 __elfN(note_procstat_proc), p);
1774 size += register_note(list, NT_PROCSTAT_FILES,
1775 note_procstat_files, p);
1776 size += register_note(list, NT_PROCSTAT_VMMAP,
1777 note_procstat_vmmap, p);
1778 size += register_note(list, NT_PROCSTAT_GROUPS,
1779 note_procstat_groups, p);
1780 size += register_note(list, NT_PROCSTAT_UMASK,
1781 note_procstat_umask, p);
1782 size += register_note(list, NT_PROCSTAT_RLIMIT,
1783 note_procstat_rlimit, p);
1784 size += register_note(list, NT_PROCSTAT_OSREL,
1785 note_procstat_osrel, p);
1786 size += register_note(list, NT_PROCSTAT_PSSTRINGS,
1787 __elfN(note_procstat_psstrings), p);
1788 size += register_note(list, NT_PROCSTAT_AUXV,
1789 __elfN(note_procstat_auxv), p);
1795 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs,
1801 struct phdr_closure phc;
1803 ehdr = (Elf_Ehdr *)hdr;
1805 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1806 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1807 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1808 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1809 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1810 ehdr->e_ident[EI_DATA] = ELF_DATA;
1811 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1812 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
1813 ehdr->e_ident[EI_ABIVERSION] = 0;
1814 ehdr->e_ident[EI_PAD] = 0;
1815 ehdr->e_type = ET_CORE;
1816 ehdr->e_machine = td->td_proc->p_elf_machine;
1817 ehdr->e_version = EV_CURRENT;
1819 ehdr->e_phoff = sizeof(Elf_Ehdr);
1820 ehdr->e_flags = td->td_proc->p_elf_flags;
1821 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1822 ehdr->e_phentsize = sizeof(Elf_Phdr);
1823 ehdr->e_shentsize = sizeof(Elf_Shdr);
1824 ehdr->e_shstrndx = SHN_UNDEF;
1825 if (numsegs + 1 < PN_XNUM) {
1826 ehdr->e_phnum = numsegs + 1;
1829 ehdr->e_phnum = PN_XNUM;
1832 ehdr->e_shoff = ehdr->e_phoff +
1833 (numsegs + 1) * ehdr->e_phentsize;
1834 KASSERT(ehdr->e_shoff == hdrsize - sizeof(Elf_Shdr),
1835 ("e_shoff: %zu, hdrsize - shdr: %zu",
1836 (size_t)ehdr->e_shoff, hdrsize - sizeof(Elf_Shdr)));
1838 shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff);
1839 memset(shdr, 0, sizeof(*shdr));
1841 * A special first section is used to hold large segment and
1842 * section counts. This was proposed by Sun Microsystems in
1843 * Solaris and has been adopted by Linux; the standard ELF
1844 * tools are already familiar with the technique.
1846 * See table 7-7 of the Solaris "Linker and Libraries Guide"
1847 * (or 12-7 depending on the version of the document) for more
1850 shdr->sh_type = SHT_NULL;
1851 shdr->sh_size = ehdr->e_shnum;
1852 shdr->sh_link = ehdr->e_shstrndx;
1853 shdr->sh_info = numsegs + 1;
1857 * Fill in the program header entries.
1859 phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff);
1861 /* The note segement. */
1862 phdr->p_type = PT_NOTE;
1863 phdr->p_offset = hdrsize;
1866 phdr->p_filesz = notesz;
1868 phdr->p_flags = PF_R;
1869 phdr->p_align = ELF_NOTE_ROUNDSIZE;
1872 /* All the writable segments from the program. */
1874 phc.offset = round_page(hdrsize + notesz);
1875 each_dumpable_segment(td, cb_put_phdr, &phc);
1879 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg)
1881 struct note_info *ninfo;
1882 size_t size, notesize;
1885 out(arg, NULL, &size);
1886 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK);
1888 ninfo->outfunc = out;
1889 ninfo->outarg = arg;
1890 ninfo->outsize = size;
1891 TAILQ_INSERT_TAIL(list, ninfo, link);
1896 notesize = sizeof(Elf_Note) + /* note header */
1897 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
1899 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
1905 append_note_data(const void *src, void *dst, size_t len)
1909 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE);
1911 bcopy(src, dst, len);
1912 bzero((char *)dst + len, padded_len - len);
1914 return (padded_len);
1918 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp)
1926 note = (Elf_Note *)buf;
1927 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR);
1928 note->n_descsz = size;
1929 note->n_type = type;
1930 buf += sizeof(*note);
1931 buf += append_note_data(FREEBSD_ABI_VENDOR, buf,
1932 sizeof(FREEBSD_ABI_VENDOR));
1933 append_note_data(src, buf, size);
1938 notesize = sizeof(Elf_Note) + /* note header */
1939 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
1941 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
1947 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb)
1950 ssize_t old_len, sect_len;
1951 size_t new_len, descsz, i;
1953 if (ninfo->type == -1) {
1954 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
1958 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR);
1959 note.n_descsz = ninfo->outsize;
1960 note.n_type = ninfo->type;
1962 sbuf_bcat(sb, ¬e, sizeof(note));
1963 sbuf_start_section(sb, &old_len);
1964 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR));
1965 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
1966 if (note.n_descsz == 0)
1968 sbuf_start_section(sb, &old_len);
1969 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
1970 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
1974 new_len = (size_t)sect_len;
1975 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE);
1976 if (new_len < descsz) {
1978 * It is expected that individual note emitters will correctly
1979 * predict their expected output size and fill up to that size
1980 * themselves, padding in a format-specific way if needed.
1981 * However, in case they don't, just do it here with zeros.
1983 for (i = 0; i < descsz - new_len; i++)
1985 } else if (new_len > descsz) {
1987 * We can't always truncate sb -- we may have drained some
1990 KASSERT(new_len == descsz, ("%s: Note type %u changed as we "
1991 "read it (%zu > %zu). Since it is longer than "
1992 "expected, this coredump's notes are corrupt. THIS "
1993 "IS A BUG in the note_procstat routine for type %u.\n",
1994 __func__, (unsigned)note.n_type, new_len, descsz,
1995 (unsigned)note.n_type));
2000 * Miscellaneous note out functions.
2003 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2004 #include <compat/freebsd32/freebsd32.h>
2005 #include <compat/freebsd32/freebsd32_signal.h>
2007 typedef struct prstatus32 elf_prstatus_t;
2008 typedef struct prpsinfo32 elf_prpsinfo_t;
2009 typedef struct fpreg32 elf_prfpregset_t;
2010 typedef struct fpreg32 elf_fpregset_t;
2011 typedef struct reg32 elf_gregset_t;
2012 typedef struct thrmisc32 elf_thrmisc_t;
2013 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32
2014 typedef struct kinfo_proc32 elf_kinfo_proc_t;
2015 typedef uint32_t elf_ps_strings_t;
2017 typedef prstatus_t elf_prstatus_t;
2018 typedef prpsinfo_t elf_prpsinfo_t;
2019 typedef prfpregset_t elf_prfpregset_t;
2020 typedef prfpregset_t elf_fpregset_t;
2021 typedef gregset_t elf_gregset_t;
2022 typedef thrmisc_t elf_thrmisc_t;
2023 #define ELF_KERN_PROC_MASK 0
2024 typedef struct kinfo_proc elf_kinfo_proc_t;
2025 typedef vm_offset_t elf_ps_strings_t;
2029 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep)
2035 elf_prpsinfo_t *psinfo;
2038 p = (struct proc *)arg;
2040 KASSERT(*sizep == sizeof(*psinfo), ("invalid size"));
2041 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK);
2042 psinfo->pr_version = PRPSINFO_VERSION;
2043 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t);
2044 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
2046 if (p->p_args != NULL) {
2047 len = sizeof(psinfo->pr_psargs) - 1;
2048 if (len > p->p_args->ar_length)
2049 len = p->p_args->ar_length;
2050 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len);
2056 sbuf_new(&sbarg, psinfo->pr_psargs,
2057 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN);
2058 error = proc_getargv(curthread, p, &sbarg);
2060 if (sbuf_finish(&sbarg) == 0)
2061 len = sbuf_len(&sbarg) - 1;
2063 len = sizeof(psinfo->pr_psargs) - 1;
2064 sbuf_delete(&sbarg);
2066 if (error || len == 0)
2067 strlcpy(psinfo->pr_psargs, p->p_comm,
2068 sizeof(psinfo->pr_psargs));
2070 KASSERT(len < sizeof(psinfo->pr_psargs),
2071 ("len is too long: %zu vs %zu", len,
2072 sizeof(psinfo->pr_psargs)));
2073 cp = psinfo->pr_psargs;
2076 cp = memchr(cp, '\0', end - cp);
2082 psinfo->pr_pid = p->p_pid;
2083 sbuf_bcat(sb, psinfo, sizeof(*psinfo));
2084 free(psinfo, M_TEMP);
2086 *sizep = sizeof(*psinfo);
2090 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep)
2093 elf_prstatus_t *status;
2095 td = (struct thread *)arg;
2097 KASSERT(*sizep == sizeof(*status), ("invalid size"));
2098 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK);
2099 status->pr_version = PRSTATUS_VERSION;
2100 status->pr_statussz = sizeof(elf_prstatus_t);
2101 status->pr_gregsetsz = sizeof(elf_gregset_t);
2102 status->pr_fpregsetsz = sizeof(elf_fpregset_t);
2103 status->pr_osreldate = osreldate;
2104 status->pr_cursig = td->td_proc->p_sig;
2105 status->pr_pid = td->td_tid;
2106 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2107 fill_regs32(td, &status->pr_reg);
2109 fill_regs(td, &status->pr_reg);
2111 sbuf_bcat(sb, status, sizeof(*status));
2112 free(status, M_TEMP);
2114 *sizep = sizeof(*status);
2118 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep)
2121 elf_prfpregset_t *fpregset;
2123 td = (struct thread *)arg;
2125 KASSERT(*sizep == sizeof(*fpregset), ("invalid size"));
2126 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK);
2127 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2128 fill_fpregs32(td, fpregset);
2130 fill_fpregs(td, fpregset);
2132 sbuf_bcat(sb, fpregset, sizeof(*fpregset));
2133 free(fpregset, M_TEMP);
2135 *sizep = sizeof(*fpregset);
2139 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep)
2142 elf_thrmisc_t thrmisc;
2144 td = (struct thread *)arg;
2146 KASSERT(*sizep == sizeof(thrmisc), ("invalid size"));
2147 bzero(&thrmisc._pad, sizeof(thrmisc._pad));
2148 strcpy(thrmisc.pr_tname, td->td_name);
2149 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc));
2151 *sizep = sizeof(thrmisc);
2155 __elfN(note_ptlwpinfo)(void *arg, struct sbuf *sb, size_t *sizep)
2160 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2161 struct ptrace_lwpinfo32 pl;
2163 struct ptrace_lwpinfo pl;
2166 td = (struct thread *)arg;
2167 size = sizeof(structsize) + sizeof(pl);
2169 KASSERT(*sizep == size, ("invalid size"));
2170 structsize = sizeof(pl);
2171 sbuf_bcat(sb, &structsize, sizeof(structsize));
2172 bzero(&pl, sizeof(pl));
2173 pl.pl_lwpid = td->td_tid;
2174 pl.pl_event = PL_EVENT_NONE;
2175 pl.pl_sigmask = td->td_sigmask;
2176 pl.pl_siglist = td->td_siglist;
2177 if (td->td_si.si_signo != 0) {
2178 pl.pl_event = PL_EVENT_SIGNAL;
2179 pl.pl_flags |= PL_FLAG_SI;
2180 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2181 siginfo_to_siginfo32(&td->td_si, &pl.pl_siginfo);
2183 pl.pl_siginfo = td->td_si;
2186 strcpy(pl.pl_tdname, td->td_name);
2187 /* XXX TODO: supply more information in struct ptrace_lwpinfo*/
2188 sbuf_bcat(sb, &pl, sizeof(pl));
2194 * Allow for MD specific notes, as well as any MD
2195 * specific preparations for writing MI notes.
2198 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep)
2204 td = (struct thread *)arg;
2206 if (size != 0 && sb != NULL)
2207 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK);
2211 __elfN(dump_thread)(td, buf, &size);
2212 KASSERT(sb == NULL || *sizep == size, ("invalid size"));
2213 if (size != 0 && sb != NULL)
2214 sbuf_bcat(sb, buf, size);
2219 #ifdef KINFO_PROC_SIZE
2220 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
2224 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep)
2230 p = (struct proc *)arg;
2231 size = sizeof(structsize) + p->p_numthreads *
2232 sizeof(elf_kinfo_proc_t);
2235 KASSERT(*sizep == size, ("invalid size"));
2236 structsize = sizeof(elf_kinfo_proc_t);
2237 sbuf_bcat(sb, &structsize, sizeof(structsize));
2239 kern_proc_out(p, sb, ELF_KERN_PROC_MASK);
2244 #ifdef KINFO_FILE_SIZE
2245 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE);
2249 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep)
2252 size_t size, sect_sz, i;
2253 ssize_t start_len, sect_len;
2254 int structsize, filedesc_flags;
2256 if (coredump_pack_fileinfo)
2257 filedesc_flags = KERN_FILEDESC_PACK_KINFO;
2261 p = (struct proc *)arg;
2262 structsize = sizeof(struct kinfo_file);
2265 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2266 sbuf_set_drain(sb, sbuf_drain_count, &size);
2267 sbuf_bcat(sb, &structsize, sizeof(structsize));
2269 kern_proc_filedesc_out(p, sb, -1, filedesc_flags);
2274 sbuf_start_section(sb, &start_len);
2276 sbuf_bcat(sb, &structsize, sizeof(structsize));
2278 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize),
2281 sect_len = sbuf_end_section(sb, start_len, 0, 0);
2286 KASSERT(sect_sz <= *sizep,
2287 ("kern_proc_filedesc_out did not respect maxlen; "
2288 "requested %zu, got %zu", *sizep - sizeof(structsize),
2289 sect_sz - sizeof(structsize)));
2291 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++)
2296 #ifdef KINFO_VMENTRY_SIZE
2297 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE);
2301 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep)
2305 int structsize, vmmap_flags;
2307 if (coredump_pack_vmmapinfo)
2308 vmmap_flags = KERN_VMMAP_PACK_KINFO;
2312 p = (struct proc *)arg;
2313 structsize = sizeof(struct kinfo_vmentry);
2316 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2317 sbuf_set_drain(sb, sbuf_drain_count, &size);
2318 sbuf_bcat(sb, &structsize, sizeof(structsize));
2320 kern_proc_vmmap_out(p, sb, -1, vmmap_flags);
2325 sbuf_bcat(sb, &structsize, sizeof(structsize));
2327 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize),
2333 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep)
2339 p = (struct proc *)arg;
2340 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t);
2342 KASSERT(*sizep == size, ("invalid size"));
2343 structsize = sizeof(gid_t);
2344 sbuf_bcat(sb, &structsize, sizeof(structsize));
2345 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups *
2352 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep)
2358 p = (struct proc *)arg;
2359 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask);
2361 KASSERT(*sizep == size, ("invalid size"));
2362 structsize = sizeof(p->p_fd->fd_cmask);
2363 sbuf_bcat(sb, &structsize, sizeof(structsize));
2364 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask));
2370 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep)
2373 struct rlimit rlim[RLIM_NLIMITS];
2377 p = (struct proc *)arg;
2378 size = sizeof(structsize) + sizeof(rlim);
2380 KASSERT(*sizep == size, ("invalid size"));
2381 structsize = sizeof(rlim);
2382 sbuf_bcat(sb, &structsize, sizeof(structsize));
2384 for (i = 0; i < RLIM_NLIMITS; i++)
2385 lim_rlimit_proc(p, i, &rlim[i]);
2387 sbuf_bcat(sb, rlim, sizeof(rlim));
2393 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep)
2399 p = (struct proc *)arg;
2400 size = sizeof(structsize) + sizeof(p->p_osrel);
2402 KASSERT(*sizep == size, ("invalid size"));
2403 structsize = sizeof(p->p_osrel);
2404 sbuf_bcat(sb, &structsize, sizeof(structsize));
2405 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel));
2411 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep)
2414 elf_ps_strings_t ps_strings;
2418 p = (struct proc *)arg;
2419 size = sizeof(structsize) + sizeof(ps_strings);
2421 KASSERT(*sizep == size, ("invalid size"));
2422 structsize = sizeof(ps_strings);
2423 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2424 ps_strings = PTROUT(p->p_sysent->sv_psstrings);
2426 ps_strings = p->p_sysent->sv_psstrings;
2428 sbuf_bcat(sb, &structsize, sizeof(structsize));
2429 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings));
2435 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep)
2441 p = (struct proc *)arg;
2444 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2445 sbuf_set_drain(sb, sbuf_drain_count, &size);
2446 sbuf_bcat(sb, &structsize, sizeof(structsize));
2448 proc_getauxv(curthread, p, sb);
2454 structsize = sizeof(Elf_Auxinfo);
2455 sbuf_bcat(sb, &structsize, sizeof(structsize));
2457 proc_getauxv(curthread, p, sb);
2463 __elfN(parse_notes)(struct image_params *imgp, Elf_Note *checknote,
2464 const char *note_vendor, const Elf_Phdr *pnote,
2465 boolean_t (*cb)(const Elf_Note *, void *, boolean_t *), void *cb_arg)
2467 const Elf_Note *note, *note0, *note_end;
2468 const char *note_name;
2473 /* We need some limit, might as well use PAGE_SIZE. */
2474 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE)
2476 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes");
2477 if (pnote->p_offset > PAGE_SIZE ||
2478 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) {
2479 VOP_UNLOCK(imgp->vp, 0);
2480 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK);
2481 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
2482 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz,
2483 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED,
2484 curthread->td_ucred, NOCRED, NULL, curthread);
2486 uprintf("i/o error PT_NOTE\n");
2489 note = note0 = (const Elf_Note *)buf;
2490 note_end = (const Elf_Note *)(buf + pnote->p_filesz);
2492 note = note0 = (const Elf_Note *)(imgp->image_header +
2494 note_end = (const Elf_Note *)(imgp->image_header +
2495 pnote->p_offset + pnote->p_filesz);
2498 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) {
2499 if (!aligned(note, Elf32_Addr) || (const char *)note_end -
2500 (const char *)note < sizeof(Elf_Note)) {
2503 if (note->n_namesz != checknote->n_namesz ||
2504 note->n_descsz != checknote->n_descsz ||
2505 note->n_type != checknote->n_type)
2507 note_name = (const char *)(note + 1);
2508 if (note_name + checknote->n_namesz >=
2509 (const char *)note_end || strncmp(note_vendor,
2510 note_name, checknote->n_namesz) != 0)
2513 if (cb(note, cb_arg, &res))
2516 note = (const Elf_Note *)((const char *)(note + 1) +
2517 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) +
2518 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE));
2527 struct brandnote_cb_arg {
2528 Elf_Brandnote *brandnote;
2533 brandnote_cb(const Elf_Note *note, void *arg0, boolean_t *res)
2535 struct brandnote_cb_arg *arg;
2540 * Fetch the osreldate for binary from the ELF OSABI-note if
2543 *res = (arg->brandnote->flags & BN_TRANSLATE_OSREL) != 0 &&
2544 arg->brandnote->trans_osrel != NULL ?
2545 arg->brandnote->trans_osrel(note, arg->osrel) : TRUE;
2550 static Elf_Note fctl_note = {
2551 .n_namesz = sizeof(FREEBSD_ABI_VENDOR),
2552 .n_descsz = sizeof(uint32_t),
2553 .n_type = NT_FREEBSD_FEATURE_CTL,
2556 struct fctl_cb_arg {
2561 note_fctl_cb(const Elf_Note *note, void *arg0, boolean_t *res)
2563 struct fctl_cb_arg *arg;
2564 const Elf32_Word *desc;
2568 p = (uintptr_t)(note + 1);
2569 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
2570 desc = (const Elf32_Word *)p;
2571 *arg->fctl0 = desc[0];
2576 * Try to find the appropriate ABI-note section for checknote, fetch
2577 * the osreldate and feature control flags for binary from the ELF
2578 * OSABI-note. Only the first page of the image is searched, the same
2582 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *brandnote,
2583 int32_t *osrel, uint32_t *fctl0)
2585 const Elf_Phdr *phdr;
2586 const Elf_Ehdr *hdr;
2587 struct brandnote_cb_arg b_arg;
2588 struct fctl_cb_arg f_arg;
2591 hdr = (const Elf_Ehdr *)imgp->image_header;
2592 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
2593 b_arg.brandnote = brandnote;
2594 b_arg.osrel = osrel;
2595 f_arg.fctl0 = fctl0;
2597 for (i = 0; i < hdr->e_phnum; i++) {
2598 if (phdr[i].p_type == PT_NOTE && __elfN(parse_notes)(imgp,
2599 &brandnote->hdr, brandnote->vendor, &phdr[i], brandnote_cb,
2601 for (j = 0; j < hdr->e_phnum; j++) {
2602 if (phdr[j].p_type == PT_NOTE &&
2603 __elfN(parse_notes)(imgp, &fctl_note,
2604 FREEBSD_ABI_VENDOR, &phdr[j],
2605 note_fctl_cb, &f_arg))
2616 * Tell kern_execve.c about it, with a little help from the linker.
2618 static struct execsw __elfN(execsw) = {
2619 .ex_imgact = __CONCAT(exec_, __elfN(imgact)),
2620 .ex_name = __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
2622 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
2625 __elfN(trans_prot)(Elf_Word flags)
2631 prot |= VM_PROT_EXECUTE;
2633 prot |= VM_PROT_WRITE;
2635 prot |= VM_PROT_READ;
2636 #if __ELF_WORD_SIZE == 32 && (defined(__amd64__) || defined(__i386__))
2637 if (i386_read_exec && (flags & PF_R))
2638 prot |= VM_PROT_EXECUTE;
2644 __elfN(untrans_prot)(vm_prot_t prot)
2649 if (prot & VM_PROT_EXECUTE)
2651 if (prot & VM_PROT_READ)
2653 if (prot & VM_PROT_WRITE)