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,
93 u_long *entry, size_t pagesize);
94 static int __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset,
95 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
97 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp);
98 static bool __elfN(freebsd_trans_osrel)(const Elf_Note *note,
100 static bool kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel);
101 static boolean_t __elfN(check_note)(struct image_params *imgp,
102 Elf_Brandnote *checknote, int32_t *osrel, uint32_t *fctl0);
103 static vm_prot_t __elfN(trans_prot)(Elf_Word);
104 static Elf_Word __elfN(untrans_prot)(vm_prot_t);
106 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0,
109 #define CORE_BUF_SIZE (16 * 1024)
111 int __elfN(fallback_brand) = -1;
112 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
113 fallback_brand, CTLFLAG_RWTUN, &__elfN(fallback_brand), 0,
114 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort");
116 static int elf_legacy_coredump = 0;
117 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW,
118 &elf_legacy_coredump, 0,
119 "include all and only RW pages in core dumps");
121 int __elfN(nxstack) =
122 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */ || \
123 (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__) || \
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 SYSCTL_NODE(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, aslr, CTLFLAG_RW, 0,
141 #define ASLR_NODE_OID __CONCAT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), _aslr)
143 static int __elfN(aslr_enabled) = 0;
144 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, enable, CTLFLAG_RWTUN,
145 &__elfN(aslr_enabled), 0,
146 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
147 ": enable address map randomization");
149 static int __elfN(pie_aslr_enabled) = 0;
150 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, pie_enable, CTLFLAG_RWTUN,
151 &__elfN(pie_aslr_enabled), 0,
152 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
153 ": enable address map randomization for PIE binaries");
155 static int __elfN(aslr_honor_sbrk) = 1;
156 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, honor_sbrk, CTLFLAG_RW,
157 &__elfN(aslr_honor_sbrk), 0,
158 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": assume sbrk is used");
160 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS];
162 #define trunc_page_ps(va, ps) rounddown2(va, ps)
163 #define round_page_ps(va, ps) roundup2(va, ps)
164 #define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a))
166 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD";
168 Elf_Brandnote __elfN(freebsd_brandnote) = {
169 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR),
170 .hdr.n_descsz = sizeof(int32_t),
171 .hdr.n_type = NT_FREEBSD_ABI_TAG,
172 .vendor = FREEBSD_ABI_VENDOR,
173 .flags = BN_TRANSLATE_OSREL,
174 .trans_osrel = __elfN(freebsd_trans_osrel)
178 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel)
182 p = (uintptr_t)(note + 1);
183 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
184 *osrel = *(const int32_t *)(p);
189 static const char GNU_ABI_VENDOR[] = "GNU";
190 static int GNU_KFREEBSD_ABI_DESC = 3;
192 Elf_Brandnote __elfN(kfreebsd_brandnote) = {
193 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
194 .hdr.n_descsz = 16, /* XXX at least 16 */
196 .vendor = GNU_ABI_VENDOR,
197 .flags = BN_TRANSLATE_OSREL,
198 .trans_osrel = kfreebsd_trans_osrel
202 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel)
204 const Elf32_Word *desc;
207 p = (uintptr_t)(note + 1);
208 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
210 desc = (const Elf32_Word *)p;
211 if (desc[0] != GNU_KFREEBSD_ABI_DESC)
215 * Debian GNU/kFreeBSD embed the earliest compatible kernel version
216 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way.
218 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3];
224 __elfN(insert_brand_entry)(Elf_Brandinfo *entry)
228 for (i = 0; i < MAX_BRANDS; i++) {
229 if (elf_brand_list[i] == NULL) {
230 elf_brand_list[i] = entry;
234 if (i == MAX_BRANDS) {
235 printf("WARNING: %s: could not insert brandinfo entry: %p\n",
243 __elfN(remove_brand_entry)(Elf_Brandinfo *entry)
247 for (i = 0; i < MAX_BRANDS; i++) {
248 if (elf_brand_list[i] == entry) {
249 elf_brand_list[i] = NULL;
259 __elfN(brand_inuse)(Elf_Brandinfo *entry)
264 sx_slock(&allproc_lock);
265 FOREACH_PROC_IN_SYSTEM(p) {
266 if (p->p_sysent == entry->sysvec) {
271 sx_sunlock(&allproc_lock);
276 static Elf_Brandinfo *
277 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
278 int interp_name_len, int32_t *osrel, uint32_t *fctl0)
280 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
281 Elf_Brandinfo *bi, *bi_m;
286 * We support four types of branding -- (1) the ELF EI_OSABI field
287 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
288 * branding w/in the ELF header, (3) path of the `interp_path'
289 * field, and (4) the ".note.ABI-tag" ELF section.
292 /* Look for an ".note.ABI-tag" ELF section */
294 for (i = 0; i < MAX_BRANDS; i++) {
295 bi = elf_brand_list[i];
298 if (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)
300 if (hdr->e_machine == bi->machine && (bi->flags &
301 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
302 ret = __elfN(check_note)(imgp, bi->brand_note, osrel,
304 /* Give brand a chance to veto check_note's guess */
305 if (ret && bi->header_supported)
306 ret = bi->header_supported(imgp);
308 * If note checker claimed the binary, but the
309 * interpreter path in the image does not
310 * match default one for the brand, try to
311 * search for other brands with the same
312 * interpreter. Either there is better brand
313 * with the right interpreter, or, failing
314 * this, we return first brand which accepted
315 * our note and, optionally, header.
317 if (ret && bi_m == NULL && interp != NULL &&
318 (bi->interp_path == NULL ||
319 (strlen(bi->interp_path) + 1 != interp_name_len ||
320 strncmp(interp, bi->interp_path, interp_name_len)
332 /* If the executable has a brand, search for it in the brand list. */
333 for (i = 0; i < MAX_BRANDS; i++) {
334 bi = elf_brand_list[i];
335 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 ||
336 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0))
338 if (hdr->e_machine == bi->machine &&
339 (hdr->e_ident[EI_OSABI] == bi->brand ||
340 (bi->compat_3_brand != NULL &&
341 strcmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
342 bi->compat_3_brand) == 0))) {
343 /* Looks good, but give brand a chance to veto */
344 if (bi->header_supported == NULL ||
345 bi->header_supported(imgp)) {
347 * Again, prefer strictly matching
350 if (interp_name_len == 0 &&
351 bi->interp_path == NULL)
353 if (bi->interp_path != NULL &&
354 strlen(bi->interp_path) + 1 ==
355 interp_name_len && strncmp(interp,
356 bi->interp_path, interp_name_len) == 0)
366 /* No known brand, see if the header is recognized by any brand */
367 for (i = 0; i < MAX_BRANDS; i++) {
368 bi = elf_brand_list[i];
369 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY ||
370 bi->header_supported == NULL)
372 if (hdr->e_machine == bi->machine) {
373 ret = bi->header_supported(imgp);
379 /* Lacking a known brand, search for a recognized interpreter. */
380 if (interp != NULL) {
381 for (i = 0; i < MAX_BRANDS; i++) {
382 bi = elf_brand_list[i];
383 if (bi == NULL || (bi->flags &
384 (BI_BRAND_NOTE_MANDATORY | BI_BRAND_ONLY_STATIC))
387 if (hdr->e_machine == bi->machine &&
388 bi->interp_path != NULL &&
389 /* ELF image p_filesz includes terminating zero */
390 strlen(bi->interp_path) + 1 == interp_name_len &&
391 strncmp(interp, bi->interp_path, interp_name_len)
392 == 0 && (bi->header_supported == NULL ||
393 bi->header_supported(imgp)))
398 /* Lacking a recognized interpreter, try the default brand */
399 for (i = 0; i < MAX_BRANDS; i++) {
400 bi = elf_brand_list[i];
401 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 ||
402 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0))
404 if (hdr->e_machine == bi->machine &&
405 __elfN(fallback_brand) == bi->brand &&
406 (bi->header_supported == NULL ||
407 bi->header_supported(imgp)))
414 __elfN(check_header)(const Elf_Ehdr *hdr)
420 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
421 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
422 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
423 hdr->e_phentsize != sizeof(Elf_Phdr) ||
424 hdr->e_version != ELF_TARG_VER)
428 * Make sure we have at least one brand for this machine.
431 for (i = 0; i < MAX_BRANDS; i++) {
432 bi = elf_brand_list[i];
433 if (bi != NULL && bi->machine == hdr->e_machine)
443 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
444 vm_offset_t start, vm_offset_t end, vm_prot_t prot)
451 * Create the page if it doesn't exist yet. Ignore errors.
453 vm_map_fixed(map, NULL, 0, trunc_page(start), round_page(end) -
454 trunc_page(start), VM_PROT_ALL, VM_PROT_ALL, MAP_CHECK_EXCL);
457 * Find the page from the underlying object.
459 if (object != NULL) {
460 sf = vm_imgact_map_page(object, offset);
462 return (KERN_FAILURE);
463 off = offset - trunc_page(offset);
464 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start,
466 vm_imgact_unmap_page(sf);
468 return (KERN_FAILURE);
471 return (KERN_SUCCESS);
475 __elfN(map_insert)(struct image_params *imgp, vm_map_t map, vm_object_t object,
476 vm_ooffset_t offset, vm_offset_t start, vm_offset_t end, vm_prot_t prot,
482 int error, locked, rv;
484 if (start != trunc_page(start)) {
485 rv = __elfN(map_partial)(map, object, offset, start,
486 round_page(start), prot);
487 if (rv != KERN_SUCCESS)
489 offset += round_page(start) - start;
490 start = round_page(start);
492 if (end != round_page(end)) {
493 rv = __elfN(map_partial)(map, object, offset +
494 trunc_page(end) - start, trunc_page(end), end, prot);
495 if (rv != KERN_SUCCESS)
497 end = trunc_page(end);
500 return (KERN_SUCCESS);
501 if ((offset & PAGE_MASK) != 0) {
503 * The mapping is not page aligned. This means that we have
506 rv = vm_map_fixed(map, NULL, 0, start, end - start,
507 prot | VM_PROT_WRITE, VM_PROT_ALL, MAP_CHECK_EXCL);
508 if (rv != KERN_SUCCESS)
511 return (KERN_SUCCESS);
512 for (; start < end; start += sz) {
513 sf = vm_imgact_map_page(object, offset);
515 return (KERN_FAILURE);
516 off = offset - trunc_page(offset);
518 if (sz > PAGE_SIZE - off)
519 sz = PAGE_SIZE - off;
520 error = copyout((caddr_t)sf_buf_kva(sf) + off,
522 vm_imgact_unmap_page(sf);
524 return (KERN_FAILURE);
528 vm_object_reference(object);
529 rv = vm_map_fixed(map, object, offset, start, end - start,
530 prot, VM_PROT_ALL, cow | MAP_CHECK_EXCL);
531 if (rv != KERN_SUCCESS) {
532 locked = VOP_ISLOCKED(imgp->vp);
533 VOP_UNLOCK(imgp->vp, 0);
534 vm_object_deallocate(object);
535 vn_lock(imgp->vp, locked | LK_RETRY);
539 return (KERN_SUCCESS);
543 __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset,
544 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
551 vm_offset_t off, map_addr;
554 vm_ooffset_t file_addr;
557 * It's necessary to fail if the filsz + offset taken from the
558 * header is greater than the actual file pager object's size.
559 * If we were to allow this, then the vm_map_find() below would
560 * walk right off the end of the file object and into the ether.
562 * While I'm here, might as well check for something else that
563 * is invalid: filsz cannot be greater than memsz.
565 if ((filsz != 0 && (off_t)filsz + offset > imgp->attr->va_size) ||
567 uprintf("elf_load_section: truncated ELF file\n");
571 object = imgp->object;
572 map = &imgp->proc->p_vmspace->vm_map;
573 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize);
574 file_addr = trunc_page_ps(offset, pagesize);
577 * We have two choices. We can either clear the data in the last page
578 * of an oversized mapping, or we can start the anon mapping a page
579 * early and copy the initialized data into that first page. We
584 else if (memsz > filsz)
585 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr;
587 map_len = round_page_ps(offset + filsz, pagesize) - file_addr;
590 /* cow flags: don't dump readonly sections in core */
591 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
592 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
594 rv = __elfN(map_insert)(imgp, map,
596 file_addr, /* file offset */
597 map_addr, /* virtual start */
598 map_addr + map_len,/* virtual end */
601 if (rv != KERN_SUCCESS)
604 /* we can stop now if we've covered it all */
611 * We have to get the remaining bit of the file into the first part
612 * of the oversized map segment. This is normally because the .data
613 * segment in the file is extended to provide bss. It's a neat idea
614 * to try and save a page, but it's a pain in the behind to implement.
616 copy_len = filsz == 0 ? 0 : (offset + filsz) - trunc_page_ps(offset +
618 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize);
619 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) -
622 /* This had damn well better be true! */
624 rv = __elfN(map_insert)(imgp, map, NULL, 0, map_addr,
625 map_addr + map_len, prot, 0);
626 if (rv != KERN_SUCCESS)
631 sf = vm_imgact_map_page(object, offset + filsz);
635 /* send the page fragment to user space */
636 off = trunc_page_ps(offset + filsz, pagesize) -
637 trunc_page(offset + filsz);
638 error = copyout((caddr_t)sf_buf_kva(sf) + off,
639 (caddr_t)map_addr, copy_len);
640 vm_imgact_unmap_page(sf);
646 * Remove write access to the page if it was only granted by map_insert
649 if ((prot & VM_PROT_WRITE) == 0)
650 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr +
651 map_len), prot, FALSE);
657 * Load the file "file" into memory. It may be either a shared object
660 * The "addr" reference parameter is in/out. On entry, it specifies
661 * the address where a shared object should be loaded. If the file is
662 * an executable, this value is ignored. On exit, "addr" specifies
663 * where the file was actually loaded.
665 * The "entry" reference parameter is out only. On exit, it specifies
666 * the entry point for the loaded file.
669 __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
670 u_long *entry, size_t pagesize)
675 struct image_params image_params;
677 const Elf_Ehdr *hdr = NULL;
678 const Elf_Phdr *phdr = NULL;
679 struct nameidata *nd;
681 struct image_params *imgp;
684 u_long base_addr = 0;
685 int error, i, numsegs;
687 #ifdef CAPABILITY_MODE
689 * XXXJA: This check can go away once we are sufficiently confident
690 * that the checks in namei() are correct.
692 if (IN_CAPABILITY_MODE(curthread))
696 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
698 attr = &tempdata->attr;
699 imgp = &tempdata->image_params;
702 * Initialize part of the common data
706 imgp->firstpage = NULL;
707 imgp->image_header = NULL;
709 imgp->execlabel = NULL;
711 NDINIT(nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, curthread);
712 if ((error = namei(nd)) != 0) {
716 NDFREE(nd, NDF_ONLY_PNBUF);
717 imgp->vp = nd->ni_vp;
720 * Check permissions, modes, uid, etc on the file, and "open" it.
722 error = exec_check_permissions(imgp);
726 error = exec_map_first_page(imgp);
731 * Also make certain that the interpreter stays the same, so set
732 * its VV_TEXT flag, too.
734 VOP_SET_TEXT(nd->ni_vp);
736 imgp->object = nd->ni_vp->v_object;
738 hdr = (const Elf_Ehdr *)imgp->image_header;
739 if ((error = __elfN(check_header)(hdr)) != 0)
741 if (hdr->e_type == ET_DYN)
743 else if (hdr->e_type == ET_EXEC)
750 /* Only support headers that fit within first page for now */
751 if ((hdr->e_phoff > PAGE_SIZE) ||
752 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
757 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
758 if (!aligned(phdr, Elf_Addr)) {
763 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
764 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) {
765 /* Loadable segment */
766 prot = __elfN(trans_prot)(phdr[i].p_flags);
767 error = __elfN(load_section)(imgp, phdr[i].p_offset,
768 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase,
769 phdr[i].p_memsz, phdr[i].p_filesz, prot, pagesize);
773 * Establish the base address if this is the
777 base_addr = trunc_page(phdr[i].p_vaddr +
783 *entry = (unsigned long)hdr->e_entry + rbase;
787 exec_unmap_first_page(imgp);
792 free(tempdata, M_TEMP);
798 __CONCAT(rnd_, __elfN(base))(vm_map_t map __unused, u_long minv, u_long maxv,
803 MPASS(vm_map_min(map) <= minv);
804 MPASS(maxv <= vm_map_max(map));
806 MPASS(minv + align < maxv);
807 arc4rand(&rbase, sizeof(rbase), 0);
808 res = roundup(minv, (u_long)align) + rbase % (maxv - minv);
809 res &= ~((u_long)align - 1);
813 ("res %#lx < minv %#lx, maxv %#lx rbase %#lx",
814 res, minv, maxv, rbase));
816 ("res %#lx > maxv %#lx, minv %#lx rbase %#lx",
817 res, maxv, minv, rbase));
822 * Impossible et_dyn_addr initial value indicating that the real base
823 * must be calculated later with some randomization applied.
825 #define ET_DYN_ADDR_RAND 1
828 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
832 const Elf_Phdr *phdr;
833 Elf_Auxargs *elf_auxargs;
834 struct vmspace *vmspace;
836 const char *err_str, *newinterp;
837 char *interp, *interp_buf, *path;
838 Elf_Brandinfo *brand_info;
839 struct sysentvec *sv;
841 u_long text_size, data_size, total_size, text_addr, data_addr;
842 u_long seg_size, seg_addr, addr, baddr, et_dyn_addr, entry, proghdr;
843 u_long maxalign, mapsz, maxv, maxv1;
846 int error, i, n, interp_name_len, have_interp;
848 hdr = (const Elf_Ehdr *)imgp->image_header;
851 * Do we have a valid ELF header ?
853 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later
854 * if particular brand doesn't support it.
856 if (__elfN(check_header)(hdr) != 0 ||
857 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
861 * From here on down, we return an errno, not -1, as we've
862 * detected an ELF file.
865 if ((hdr->e_phoff > PAGE_SIZE) ||
866 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
867 /* Only support headers in first page for now */
868 uprintf("Program headers not in the first page\n");
871 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
872 if (!aligned(phdr, Elf_Addr)) {
873 uprintf("Unaligned program headers\n");
881 text_size = data_size = total_size = text_addr = data_addr = 0;
884 err_str = newinterp = NULL;
885 interp = interp_buf = NULL;
887 maxalign = PAGE_SIZE;
890 for (i = 0; i < hdr->e_phnum; i++) {
891 switch (phdr[i].p_type) {
894 baddr = phdr[i].p_vaddr;
895 if (phdr[i].p_align > maxalign)
896 maxalign = phdr[i].p_align;
897 mapsz += phdr[i].p_memsz;
901 /* Path to interpreter */
902 if (phdr[i].p_filesz < 2 ||
903 phdr[i].p_filesz > MAXPATHLEN) {
904 uprintf("Invalid PT_INTERP\n");
908 if (interp != NULL) {
909 uprintf("Multiple PT_INTERP headers\n");
913 interp_name_len = phdr[i].p_filesz;
914 if (phdr[i].p_offset > PAGE_SIZE ||
915 interp_name_len > PAGE_SIZE - phdr[i].p_offset) {
916 VOP_UNLOCK(imgp->vp, 0);
917 interp_buf = malloc(interp_name_len + 1, M_TEMP,
919 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
920 error = vn_rdwr(UIO_READ, imgp->vp, interp_buf,
921 interp_name_len, phdr[i].p_offset,
922 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred,
925 uprintf("i/o error PT_INTERP %d\n",
929 interp_buf[interp_name_len] = '\0';
932 interp = __DECONST(char *, imgp->image_header) +
934 if (interp[interp_name_len - 1] != '\0') {
935 uprintf("Invalid PT_INTERP\n");
944 __elfN(trans_prot)(phdr[i].p_flags);
945 imgp->stack_sz = phdr[i].p_memsz;
950 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len,
952 if (brand_info == NULL) {
953 uprintf("ELF binary type \"%u\" not known.\n",
954 hdr->e_ident[EI_OSABI]);
958 sv = brand_info->sysvec;
960 if (hdr->e_type == ET_DYN) {
961 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) {
962 uprintf("Cannot execute shared object\n");
967 * Honour the base load address from the dso if it is
968 * non-zero for some reason.
971 if ((sv->sv_flags & SV_ASLR) == 0 ||
972 (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0)
973 et_dyn_addr = ET_DYN_LOAD_ADDR;
974 else if ((__elfN(pie_aslr_enabled) &&
975 (imgp->proc->p_flag2 & P2_ASLR_DISABLE) == 0) ||
976 (imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0)
977 et_dyn_addr = ET_DYN_ADDR_RAND;
979 et_dyn_addr = ET_DYN_LOAD_ADDR;
982 if (interp != NULL && brand_info->interp_newpath != NULL)
983 newinterp = brand_info->interp_newpath;
986 * Avoid a possible deadlock if the current address space is destroyed
987 * and that address space maps the locked vnode. In the common case,
988 * the locked vnode's v_usecount is decremented but remains greater
989 * than zero. Consequently, the vnode lock is not needed by vrele().
990 * However, in cases where the vnode lock is external, such as nullfs,
991 * v_usecount may become zero.
993 * The VV_TEXT flag prevents modifications to the executable while
994 * the vnode is unlocked.
996 VOP_UNLOCK(imgp->vp, 0);
999 * Decide whether to enable randomization of user mappings.
1000 * First, reset user preferences for the setid binaries.
1001 * Then, account for the support of the randomization by the
1002 * ABI, by user preferences, and make special treatment for
1005 if (imgp->credential_setid) {
1006 PROC_LOCK(imgp->proc);
1007 imgp->proc->p_flag2 &= ~(P2_ASLR_ENABLE | P2_ASLR_DISABLE);
1008 PROC_UNLOCK(imgp->proc);
1010 if ((sv->sv_flags & SV_ASLR) == 0 ||
1011 (imgp->proc->p_flag2 & P2_ASLR_DISABLE) != 0 ||
1012 (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0) {
1013 KASSERT(et_dyn_addr != ET_DYN_ADDR_RAND,
1014 ("et_dyn_addr == RAND and !ASLR"));
1015 } else if ((imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0 ||
1016 (__elfN(aslr_enabled) && hdr->e_type == ET_EXEC) ||
1017 et_dyn_addr == ET_DYN_ADDR_RAND) {
1018 imgp->map_flags |= MAP_ASLR;
1020 * If user does not care about sbrk, utilize the bss
1021 * grow region for mappings as well. We can select
1022 * the base for the image anywere and still not suffer
1023 * from the fragmentation.
1025 if (!__elfN(aslr_honor_sbrk) ||
1026 (imgp->proc->p_flag2 & P2_ASLR_IGNSTART) != 0)
1027 imgp->map_flags |= MAP_ASLR_IGNSTART;
1030 error = exec_new_vmspace(imgp, sv);
1031 vmspace = imgp->proc->p_vmspace;
1032 map = &vmspace->vm_map;
1034 imgp->proc->p_sysent = sv;
1036 maxv = vm_map_max(map) - lim_max(td, RLIMIT_STACK);
1037 if (et_dyn_addr == ET_DYN_ADDR_RAND) {
1038 KASSERT((map->flags & MAP_ASLR) != 0,
1039 ("ET_DYN_ADDR_RAND but !MAP_ASLR"));
1040 et_dyn_addr = __CONCAT(rnd_, __elfN(base))(map,
1041 vm_map_min(map) + mapsz + lim_max(td, RLIMIT_DATA),
1042 /* reserve half of the address space to interpreter */
1043 maxv / 2, 1UL << flsl(maxalign));
1046 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
1050 for (i = 0; i < hdr->e_phnum; i++) {
1051 switch (phdr[i].p_type) {
1052 case PT_LOAD: /* Loadable segment */
1053 if (phdr[i].p_memsz == 0)
1055 prot = __elfN(trans_prot)(phdr[i].p_flags);
1056 error = __elfN(load_section)(imgp, phdr[i].p_offset,
1057 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr,
1058 phdr[i].p_memsz, phdr[i].p_filesz, prot,
1064 * If this segment contains the program headers,
1065 * remember their virtual address for the AT_PHDR
1066 * aux entry. Static binaries don't usually include
1069 if (phdr[i].p_offset == 0 &&
1070 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize
1071 <= phdr[i].p_filesz)
1072 proghdr = phdr[i].p_vaddr + hdr->e_phoff +
1075 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
1076 seg_size = round_page(phdr[i].p_memsz +
1077 phdr[i].p_vaddr + et_dyn_addr - seg_addr);
1080 * Make the largest executable segment the official
1081 * text segment and all others data.
1083 * Note that obreak() assumes that data_addr +
1084 * data_size == end of data load area, and the ELF
1085 * file format expects segments to be sorted by
1086 * address. If multiple data segments exist, the
1087 * last one will be used.
1090 if (phdr[i].p_flags & PF_X && text_size < seg_size) {
1091 text_size = seg_size;
1092 text_addr = seg_addr;
1094 data_size = seg_size;
1095 data_addr = seg_addr;
1097 total_size += seg_size;
1099 case PT_PHDR: /* Program header table info */
1100 proghdr = phdr[i].p_vaddr + et_dyn_addr;
1107 if (data_addr == 0 && data_size == 0) {
1108 data_addr = text_addr;
1109 data_size = text_size;
1112 entry = (u_long)hdr->e_entry + et_dyn_addr;
1115 * Check limits. It should be safe to check the
1116 * limits after loading the segments since we do
1117 * not actually fault in all the segments pages.
1119 PROC_LOCK(imgp->proc);
1120 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA))
1121 err_str = "Data segment size exceeds process limit";
1122 else if (text_size > maxtsiz)
1123 err_str = "Text segment size exceeds system limit";
1124 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM))
1125 err_str = "Total segment size exceeds process limit";
1126 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0)
1127 err_str = "Data segment size exceeds resource limit";
1128 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0)
1129 err_str = "Total segment size exceeds resource limit";
1130 if (err_str != NULL) {
1131 PROC_UNLOCK(imgp->proc);
1132 uprintf("%s\n", err_str);
1137 vmspace->vm_tsize = text_size >> PAGE_SHIFT;
1138 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
1139 vmspace->vm_dsize = data_size >> PAGE_SHIFT;
1140 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
1143 * We load the dynamic linker where a userland call
1144 * to mmap(0, ...) would put it. The rationale behind this
1145 * calculation is that it leaves room for the heap to grow to
1146 * its maximum allowed size.
1148 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td,
1150 if ((map->flags & MAP_ASLR) != 0) {
1151 maxv1 = maxv / 2 + addr / 2;
1152 MPASS(maxv1 >= addr); /* No overflow */
1153 map->anon_loc = __CONCAT(rnd_, __elfN(base))(map, addr, maxv1,
1154 MAXPAGESIZES > 1 ? pagesizes[1] : pagesizes[0]);
1156 map->anon_loc = addr;
1158 PROC_UNLOCK(imgp->proc);
1160 imgp->entry_addr = entry;
1162 if (interp != NULL) {
1163 have_interp = FALSE;
1164 VOP_UNLOCK(imgp->vp, 0);
1165 if ((map->flags & MAP_ASLR) != 0) {
1166 /* Assume that interpeter fits into 1/4 of AS */
1167 maxv1 = maxv / 2 + addr / 2;
1168 MPASS(maxv1 >= addr); /* No overflow */
1169 addr = __CONCAT(rnd_, __elfN(base))(map, addr,
1172 if (brand_info->emul_path != NULL &&
1173 brand_info->emul_path[0] != '\0') {
1174 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
1175 snprintf(path, MAXPATHLEN, "%s%s",
1176 brand_info->emul_path, interp);
1177 error = __elfN(load_file)(imgp->proc, path, &addr,
1178 &imgp->entry_addr, sv->sv_pagesize);
1183 if (!have_interp && newinterp != NULL &&
1184 (brand_info->interp_path == NULL ||
1185 strcmp(interp, brand_info->interp_path) == 0)) {
1186 error = __elfN(load_file)(imgp->proc, newinterp, &addr,
1187 &imgp->entry_addr, sv->sv_pagesize);
1192 error = __elfN(load_file)(imgp->proc, interp, &addr,
1193 &imgp->entry_addr, sv->sv_pagesize);
1195 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
1197 uprintf("ELF interpreter %s not found, error %d\n",
1205 * Construct auxargs table (used by the fixup routine)
1207 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
1208 elf_auxargs->execfd = -1;
1209 elf_auxargs->phdr = proghdr;
1210 elf_auxargs->phent = hdr->e_phentsize;
1211 elf_auxargs->phnum = hdr->e_phnum;
1212 elf_auxargs->pagesz = PAGE_SIZE;
1213 elf_auxargs->base = addr;
1214 elf_auxargs->flags = 0;
1215 elf_auxargs->entry = entry;
1216 elf_auxargs->hdr_eflags = hdr->e_flags;
1218 imgp->auxargs = elf_auxargs;
1219 imgp->interpreted = 0;
1220 imgp->reloc_base = addr;
1221 imgp->proc->p_osrel = osrel;
1222 imgp->proc->p_fctl0 = fctl0;
1223 imgp->proc->p_elf_machine = hdr->e_machine;
1224 imgp->proc->p_elf_flags = hdr->e_flags;
1227 free(interp_buf, M_TEMP);
1231 #define suword __CONCAT(suword, __ELF_WORD_SIZE)
1234 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp)
1236 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
1237 Elf_Auxinfo *argarray, *pos;
1238 Elf_Addr *base, *auxbase;
1241 base = (Elf_Addr *)*stack_base;
1242 auxbase = base + imgp->args->argc + 1 + imgp->args->envc + 1;
1243 argarray = pos = malloc(AT_COUNT * sizeof(*pos), M_TEMP,
1246 if (args->execfd != -1)
1247 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
1248 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
1249 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
1250 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
1251 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
1252 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
1253 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
1254 AUXARGS_ENTRY(pos, AT_BASE, args->base);
1255 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags);
1256 if (imgp->execpathp != 0)
1257 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp);
1258 AUXARGS_ENTRY(pos, AT_OSRELDATE,
1259 imgp->proc->p_ucred->cr_prison->pr_osreldate);
1260 if (imgp->canary != 0) {
1261 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary);
1262 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen);
1264 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus);
1265 if (imgp->pagesizes != 0) {
1266 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes);
1267 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen);
1269 if (imgp->sysent->sv_timekeep_base != 0) {
1270 AUXARGS_ENTRY(pos, AT_TIMEKEEP,
1271 imgp->sysent->sv_timekeep_base);
1273 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj
1274 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot :
1275 imgp->sysent->sv_stackprot);
1276 if (imgp->sysent->sv_hwcap != NULL)
1277 AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap);
1278 if (imgp->sysent->sv_hwcap2 != NULL)
1279 AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2);
1280 AUXARGS_ENTRY(pos, AT_NULL, 0);
1282 free(imgp->auxargs, M_TEMP);
1283 imgp->auxargs = NULL;
1284 KASSERT(pos - argarray <= AT_COUNT, ("Too many auxargs"));
1286 error = copyout(argarray, auxbase, sizeof(*argarray) * AT_COUNT);
1287 free(argarray, M_TEMP);
1292 if (suword(base, imgp->args->argc) == -1)
1294 *stack_base = (register_t *)base;
1299 * Code for generating ELF core dumps.
1302 typedef void (*segment_callback)(vm_map_entry_t, void *);
1304 /* Closure for cb_put_phdr(). */
1305 struct phdr_closure {
1306 Elf_Phdr *phdr; /* Program header to fill in */
1307 Elf_Off offset; /* Offset of segment in core file */
1310 /* Closure for cb_size_segment(). */
1311 struct sseg_closure {
1312 int count; /* Count of writable segments. */
1313 size_t size; /* Total size of all writable segments. */
1316 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *);
1319 int type; /* Note type. */
1320 outfunc_t outfunc; /* Output function. */
1321 void *outarg; /* Argument for the output function. */
1322 size_t outsize; /* Output size. */
1323 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */
1326 TAILQ_HEAD(note_info_list, note_info);
1328 /* Coredump output parameters. */
1329 struct coredump_params {
1331 struct ucred *active_cred;
1332 struct ucred *file_cred;
1335 struct compressor *comp;
1338 extern int compress_user_cores;
1339 extern int compress_user_cores_level;
1341 static void cb_put_phdr(vm_map_entry_t, void *);
1342 static void cb_size_segment(vm_map_entry_t, void *);
1343 static int core_write(struct coredump_params *, const void *, size_t, off_t,
1345 static void each_dumpable_segment(struct thread *, segment_callback, void *);
1346 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t,
1347 struct note_info_list *, size_t);
1348 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *,
1350 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t);
1351 static void __elfN(putnote)(struct note_info *, struct sbuf *);
1352 static size_t register_note(struct note_info_list *, int, outfunc_t, void *);
1353 static int sbuf_drain_core_output(void *, const char *, int);
1354 static int sbuf_drain_count(void *arg, const char *data, int len);
1356 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *);
1357 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *);
1358 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *);
1359 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *);
1360 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *);
1361 static void __elfN(note_ptlwpinfo)(void *, struct sbuf *, size_t *);
1362 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *);
1363 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *);
1364 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *);
1365 static void note_procstat_files(void *, struct sbuf *, size_t *);
1366 static void note_procstat_groups(void *, struct sbuf *, size_t *);
1367 static void note_procstat_osrel(void *, struct sbuf *, size_t *);
1368 static void note_procstat_rlimit(void *, struct sbuf *, size_t *);
1369 static void note_procstat_umask(void *, struct sbuf *, size_t *);
1370 static void note_procstat_vmmap(void *, struct sbuf *, size_t *);
1373 * Write out a core segment to the compression stream.
1376 compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len)
1382 chunk_len = MIN(len, CORE_BUF_SIZE);
1385 * We can get EFAULT error here.
1386 * In that case zero out the current chunk of the segment.
1388 error = copyin(base, buf, chunk_len);
1390 bzero(buf, chunk_len);
1391 error = compressor_write(p->comp, buf, chunk_len);
1401 core_compressed_write(void *base, size_t len, off_t offset, void *arg)
1404 return (core_write((struct coredump_params *)arg, base, len, offset,
1409 core_write(struct coredump_params *p, const void *base, size_t len,
1410 off_t offset, enum uio_seg seg)
1413 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, __DECONST(void *, base),
1414 len, offset, seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED,
1415 p->active_cred, p->file_cred, NULL, p->td));
1419 core_output(void *base, size_t len, off_t offset, struct coredump_params *p,
1424 if (p->comp != NULL)
1425 return (compress_chunk(p, base, tmpbuf, len));
1428 * EFAULT is a non-fatal error that we can get, for example,
1429 * if the segment is backed by a file but extends beyond its
1432 error = core_write(p, base, len, offset, UIO_USERSPACE);
1433 if (error == EFAULT) {
1434 log(LOG_WARNING, "Failed to fully fault in a core file segment "
1435 "at VA %p with size 0x%zx to be written at offset 0x%jx "
1436 "for process %s\n", base, len, offset, curproc->p_comm);
1439 * Write a "real" zero byte at the end of the target region
1440 * in the case this is the last segment.
1441 * The intermediate space will be implicitly zero-filled.
1443 error = core_write(p, zero_region, 1, offset + len - 1,
1450 * Drain into a core file.
1453 sbuf_drain_core_output(void *arg, const char *data, int len)
1455 struct coredump_params *p;
1458 p = (struct coredump_params *)arg;
1461 * Some kern_proc out routines that print to this sbuf may
1462 * call us with the process lock held. Draining with the
1463 * non-sleepable lock held is unsafe. The lock is needed for
1464 * those routines when dumping a live process. In our case we
1465 * can safely release the lock before draining and acquire
1468 locked = PROC_LOCKED(p->td->td_proc);
1470 PROC_UNLOCK(p->td->td_proc);
1471 if (p->comp != NULL)
1472 error = compressor_write(p->comp, __DECONST(char *, data), len);
1474 error = core_write(p, __DECONST(void *, data), len, p->offset,
1477 PROC_LOCK(p->td->td_proc);
1485 * Drain into a counter.
1488 sbuf_drain_count(void *arg, const char *data __unused, int len)
1492 sizep = (size_t *)arg;
1498 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags)
1500 struct ucred *cred = td->td_ucred;
1502 struct sseg_closure seginfo;
1503 struct note_info_list notelst;
1504 struct coredump_params params;
1505 struct note_info *ninfo;
1507 size_t hdrsize, notesz, coresize;
1511 TAILQ_INIT(¬elst);
1513 /* Size the program segments. */
1516 each_dumpable_segment(td, cb_size_segment, &seginfo);
1519 * Collect info about the core file header area.
1521 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count);
1522 if (seginfo.count + 1 >= PN_XNUM)
1523 hdrsize += sizeof(Elf_Shdr);
1524 __elfN(prepare_notes)(td, ¬elst, ¬esz);
1525 coresize = round_page(hdrsize + notesz) + seginfo.size;
1527 /* Set up core dump parameters. */
1529 params.active_cred = cred;
1530 params.file_cred = NOCRED;
1537 PROC_LOCK(td->td_proc);
1538 error = racct_add(td->td_proc, RACCT_CORE, coresize);
1539 PROC_UNLOCK(td->td_proc);
1546 if (coresize >= limit) {
1551 /* Create a compression stream if necessary. */
1552 if (compress_user_cores != 0) {
1553 params.comp = compressor_init(core_compressed_write,
1554 compress_user_cores, CORE_BUF_SIZE,
1555 compress_user_cores_level, ¶ms);
1556 if (params.comp == NULL) {
1560 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO);
1564 * Allocate memory for building the header, fill it up,
1565 * and write it out following the notes.
1567 hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
1568 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst,
1571 /* Write the contents of all of the writable segments. */
1577 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
1578 offset = round_page(hdrsize + notesz);
1579 for (i = 0; i < seginfo.count; i++) {
1580 error = core_output((caddr_t)(uintptr_t)php->p_vaddr,
1581 php->p_filesz, offset, ¶ms, tmpbuf);
1584 offset += php->p_filesz;
1587 if (error == 0 && params.comp != NULL)
1588 error = compressor_flush(params.comp);
1592 "Failed to write core file for process %s (error %d)\n",
1593 curproc->p_comm, error);
1597 free(tmpbuf, M_TEMP);
1598 if (params.comp != NULL)
1599 compressor_fini(params.comp);
1600 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) {
1601 TAILQ_REMOVE(¬elst, ninfo, link);
1602 free(ninfo, M_TEMP);
1611 * A callback for each_dumpable_segment() to write out the segment's
1612 * program header entry.
1615 cb_put_phdr(vm_map_entry_t entry, void *closure)
1617 struct phdr_closure *phc = (struct phdr_closure *)closure;
1618 Elf_Phdr *phdr = phc->phdr;
1620 phc->offset = round_page(phc->offset);
1622 phdr->p_type = PT_LOAD;
1623 phdr->p_offset = phc->offset;
1624 phdr->p_vaddr = entry->start;
1626 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1627 phdr->p_align = PAGE_SIZE;
1628 phdr->p_flags = __elfN(untrans_prot)(entry->protection);
1630 phc->offset += phdr->p_filesz;
1635 * A callback for each_dumpable_segment() to gather information about
1636 * the number of segments and their total size.
1639 cb_size_segment(vm_map_entry_t entry, void *closure)
1641 struct sseg_closure *ssc = (struct sseg_closure *)closure;
1644 ssc->size += entry->end - entry->start;
1648 * For each writable segment in the process's memory map, call the given
1649 * function with a pointer to the map entry and some arbitrary
1650 * caller-supplied data.
1653 each_dumpable_segment(struct thread *td, segment_callback func, void *closure)
1655 struct proc *p = td->td_proc;
1656 vm_map_t map = &p->p_vmspace->vm_map;
1657 vm_map_entry_t entry;
1658 vm_object_t backing_object, object;
1659 boolean_t ignore_entry;
1661 vm_map_lock_read(map);
1662 for (entry = map->header.next; entry != &map->header;
1663 entry = entry->next) {
1665 * Don't dump inaccessible mappings, deal with legacy
1668 * Note that read-only segments related to the elf binary
1669 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1670 * need to arbitrarily ignore such segments.
1672 if (elf_legacy_coredump) {
1673 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW)
1676 if ((entry->protection & VM_PROT_ALL) == 0)
1681 * Dont include memory segment in the coredump if
1682 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1683 * madvise(2). Do not dump submaps (i.e. parts of the
1686 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP))
1689 if ((object = entry->object.vm_object) == NULL)
1692 /* Ignore memory-mapped devices and such things. */
1693 VM_OBJECT_RLOCK(object);
1694 while ((backing_object = object->backing_object) != NULL) {
1695 VM_OBJECT_RLOCK(backing_object);
1696 VM_OBJECT_RUNLOCK(object);
1697 object = backing_object;
1699 ignore_entry = object->type != OBJT_DEFAULT &&
1700 object->type != OBJT_SWAP && object->type != OBJT_VNODE &&
1701 object->type != OBJT_PHYS;
1702 VM_OBJECT_RUNLOCK(object);
1706 (*func)(entry, closure);
1708 vm_map_unlock_read(map);
1712 * Write the core file header to the file, including padding up to
1713 * the page boundary.
1716 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr,
1717 size_t hdrsize, struct note_info_list *notelst, size_t notesz)
1719 struct note_info *ninfo;
1723 /* Fill in the header. */
1724 bzero(hdr, hdrsize);
1725 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz);
1727 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN);
1728 sbuf_set_drain(sb, sbuf_drain_core_output, p);
1729 sbuf_start_section(sb, NULL);
1730 sbuf_bcat(sb, hdr, hdrsize);
1731 TAILQ_FOREACH(ninfo, notelst, link)
1732 __elfN(putnote)(ninfo, sb);
1733 /* Align up to a page boundary for the program segments. */
1734 sbuf_end_section(sb, -1, PAGE_SIZE, 0);
1735 error = sbuf_finish(sb);
1742 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list,
1752 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p);
1755 * To have the debugger select the right thread (LWP) as the initial
1756 * thread, we dump the state of the thread passed to us in td first.
1757 * This is the thread that causes the core dump and thus likely to
1758 * be the right thread one wants to have selected in the debugger.
1761 while (thr != NULL) {
1762 size += register_note(list, NT_PRSTATUS,
1763 __elfN(note_prstatus), thr);
1764 size += register_note(list, NT_FPREGSET,
1765 __elfN(note_fpregset), thr);
1766 size += register_note(list, NT_THRMISC,
1767 __elfN(note_thrmisc), thr);
1768 size += register_note(list, NT_PTLWPINFO,
1769 __elfN(note_ptlwpinfo), thr);
1770 size += register_note(list, -1,
1771 __elfN(note_threadmd), thr);
1773 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) :
1774 TAILQ_NEXT(thr, td_plist);
1776 thr = TAILQ_NEXT(thr, td_plist);
1779 size += register_note(list, NT_PROCSTAT_PROC,
1780 __elfN(note_procstat_proc), p);
1781 size += register_note(list, NT_PROCSTAT_FILES,
1782 note_procstat_files, p);
1783 size += register_note(list, NT_PROCSTAT_VMMAP,
1784 note_procstat_vmmap, p);
1785 size += register_note(list, NT_PROCSTAT_GROUPS,
1786 note_procstat_groups, p);
1787 size += register_note(list, NT_PROCSTAT_UMASK,
1788 note_procstat_umask, p);
1789 size += register_note(list, NT_PROCSTAT_RLIMIT,
1790 note_procstat_rlimit, p);
1791 size += register_note(list, NT_PROCSTAT_OSREL,
1792 note_procstat_osrel, p);
1793 size += register_note(list, NT_PROCSTAT_PSSTRINGS,
1794 __elfN(note_procstat_psstrings), p);
1795 size += register_note(list, NT_PROCSTAT_AUXV,
1796 __elfN(note_procstat_auxv), p);
1802 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs,
1808 struct phdr_closure phc;
1810 ehdr = (Elf_Ehdr *)hdr;
1812 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1813 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1814 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1815 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1816 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1817 ehdr->e_ident[EI_DATA] = ELF_DATA;
1818 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1819 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
1820 ehdr->e_ident[EI_ABIVERSION] = 0;
1821 ehdr->e_ident[EI_PAD] = 0;
1822 ehdr->e_type = ET_CORE;
1823 ehdr->e_machine = td->td_proc->p_elf_machine;
1824 ehdr->e_version = EV_CURRENT;
1826 ehdr->e_phoff = sizeof(Elf_Ehdr);
1827 ehdr->e_flags = td->td_proc->p_elf_flags;
1828 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1829 ehdr->e_phentsize = sizeof(Elf_Phdr);
1830 ehdr->e_shentsize = sizeof(Elf_Shdr);
1831 ehdr->e_shstrndx = SHN_UNDEF;
1832 if (numsegs + 1 < PN_XNUM) {
1833 ehdr->e_phnum = numsegs + 1;
1836 ehdr->e_phnum = PN_XNUM;
1839 ehdr->e_shoff = ehdr->e_phoff +
1840 (numsegs + 1) * ehdr->e_phentsize;
1841 KASSERT(ehdr->e_shoff == hdrsize - sizeof(Elf_Shdr),
1842 ("e_shoff: %zu, hdrsize - shdr: %zu",
1843 (size_t)ehdr->e_shoff, hdrsize - sizeof(Elf_Shdr)));
1845 shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff);
1846 memset(shdr, 0, sizeof(*shdr));
1848 * A special first section is used to hold large segment and
1849 * section counts. This was proposed by Sun Microsystems in
1850 * Solaris and has been adopted by Linux; the standard ELF
1851 * tools are already familiar with the technique.
1853 * See table 7-7 of the Solaris "Linker and Libraries Guide"
1854 * (or 12-7 depending on the version of the document) for more
1857 shdr->sh_type = SHT_NULL;
1858 shdr->sh_size = ehdr->e_shnum;
1859 shdr->sh_link = ehdr->e_shstrndx;
1860 shdr->sh_info = numsegs + 1;
1864 * Fill in the program header entries.
1866 phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff);
1868 /* The note segement. */
1869 phdr->p_type = PT_NOTE;
1870 phdr->p_offset = hdrsize;
1873 phdr->p_filesz = notesz;
1875 phdr->p_flags = PF_R;
1876 phdr->p_align = ELF_NOTE_ROUNDSIZE;
1879 /* All the writable segments from the program. */
1881 phc.offset = round_page(hdrsize + notesz);
1882 each_dumpable_segment(td, cb_put_phdr, &phc);
1886 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg)
1888 struct note_info *ninfo;
1889 size_t size, notesize;
1892 out(arg, NULL, &size);
1893 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK);
1895 ninfo->outfunc = out;
1896 ninfo->outarg = arg;
1897 ninfo->outsize = size;
1898 TAILQ_INSERT_TAIL(list, ninfo, link);
1903 notesize = sizeof(Elf_Note) + /* note header */
1904 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
1906 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
1912 append_note_data(const void *src, void *dst, size_t len)
1916 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE);
1918 bcopy(src, dst, len);
1919 bzero((char *)dst + len, padded_len - len);
1921 return (padded_len);
1925 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp)
1933 note = (Elf_Note *)buf;
1934 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR);
1935 note->n_descsz = size;
1936 note->n_type = type;
1937 buf += sizeof(*note);
1938 buf += append_note_data(FREEBSD_ABI_VENDOR, buf,
1939 sizeof(FREEBSD_ABI_VENDOR));
1940 append_note_data(src, buf, size);
1945 notesize = sizeof(Elf_Note) + /* note header */
1946 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
1948 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
1954 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb)
1957 ssize_t old_len, sect_len;
1958 size_t new_len, descsz, i;
1960 if (ninfo->type == -1) {
1961 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
1965 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR);
1966 note.n_descsz = ninfo->outsize;
1967 note.n_type = ninfo->type;
1969 sbuf_bcat(sb, ¬e, sizeof(note));
1970 sbuf_start_section(sb, &old_len);
1971 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR));
1972 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
1973 if (note.n_descsz == 0)
1975 sbuf_start_section(sb, &old_len);
1976 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
1977 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
1981 new_len = (size_t)sect_len;
1982 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE);
1983 if (new_len < descsz) {
1985 * It is expected that individual note emitters will correctly
1986 * predict their expected output size and fill up to that size
1987 * themselves, padding in a format-specific way if needed.
1988 * However, in case they don't, just do it here with zeros.
1990 for (i = 0; i < descsz - new_len; i++)
1992 } else if (new_len > descsz) {
1994 * We can't always truncate sb -- we may have drained some
1997 KASSERT(new_len == descsz, ("%s: Note type %u changed as we "
1998 "read it (%zu > %zu). Since it is longer than "
1999 "expected, this coredump's notes are corrupt. THIS "
2000 "IS A BUG in the note_procstat routine for type %u.\n",
2001 __func__, (unsigned)note.n_type, new_len, descsz,
2002 (unsigned)note.n_type));
2007 * Miscellaneous note out functions.
2010 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2011 #include <compat/freebsd32/freebsd32.h>
2012 #include <compat/freebsd32/freebsd32_signal.h>
2014 typedef struct prstatus32 elf_prstatus_t;
2015 typedef struct prpsinfo32 elf_prpsinfo_t;
2016 typedef struct fpreg32 elf_prfpregset_t;
2017 typedef struct fpreg32 elf_fpregset_t;
2018 typedef struct reg32 elf_gregset_t;
2019 typedef struct thrmisc32 elf_thrmisc_t;
2020 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32
2021 typedef struct kinfo_proc32 elf_kinfo_proc_t;
2022 typedef uint32_t elf_ps_strings_t;
2024 typedef prstatus_t elf_prstatus_t;
2025 typedef prpsinfo_t elf_prpsinfo_t;
2026 typedef prfpregset_t elf_prfpregset_t;
2027 typedef prfpregset_t elf_fpregset_t;
2028 typedef gregset_t elf_gregset_t;
2029 typedef thrmisc_t elf_thrmisc_t;
2030 #define ELF_KERN_PROC_MASK 0
2031 typedef struct kinfo_proc elf_kinfo_proc_t;
2032 typedef vm_offset_t elf_ps_strings_t;
2036 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep)
2042 elf_prpsinfo_t *psinfo;
2045 p = (struct proc *)arg;
2047 KASSERT(*sizep == sizeof(*psinfo), ("invalid size"));
2048 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK);
2049 psinfo->pr_version = PRPSINFO_VERSION;
2050 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t);
2051 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
2053 if (p->p_args != NULL) {
2054 len = sizeof(psinfo->pr_psargs) - 1;
2055 if (len > p->p_args->ar_length)
2056 len = p->p_args->ar_length;
2057 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len);
2063 sbuf_new(&sbarg, psinfo->pr_psargs,
2064 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN);
2065 error = proc_getargv(curthread, p, &sbarg);
2067 if (sbuf_finish(&sbarg) == 0)
2068 len = sbuf_len(&sbarg) - 1;
2070 len = sizeof(psinfo->pr_psargs) - 1;
2071 sbuf_delete(&sbarg);
2073 if (error || len == 0)
2074 strlcpy(psinfo->pr_psargs, p->p_comm,
2075 sizeof(psinfo->pr_psargs));
2077 KASSERT(len < sizeof(psinfo->pr_psargs),
2078 ("len is too long: %zu vs %zu", len,
2079 sizeof(psinfo->pr_psargs)));
2080 cp = psinfo->pr_psargs;
2083 cp = memchr(cp, '\0', end - cp);
2089 psinfo->pr_pid = p->p_pid;
2090 sbuf_bcat(sb, psinfo, sizeof(*psinfo));
2091 free(psinfo, M_TEMP);
2093 *sizep = sizeof(*psinfo);
2097 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep)
2100 elf_prstatus_t *status;
2102 td = (struct thread *)arg;
2104 KASSERT(*sizep == sizeof(*status), ("invalid size"));
2105 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK);
2106 status->pr_version = PRSTATUS_VERSION;
2107 status->pr_statussz = sizeof(elf_prstatus_t);
2108 status->pr_gregsetsz = sizeof(elf_gregset_t);
2109 status->pr_fpregsetsz = sizeof(elf_fpregset_t);
2110 status->pr_osreldate = osreldate;
2111 status->pr_cursig = td->td_proc->p_sig;
2112 status->pr_pid = td->td_tid;
2113 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2114 fill_regs32(td, &status->pr_reg);
2116 fill_regs(td, &status->pr_reg);
2118 sbuf_bcat(sb, status, sizeof(*status));
2119 free(status, M_TEMP);
2121 *sizep = sizeof(*status);
2125 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep)
2128 elf_prfpregset_t *fpregset;
2130 td = (struct thread *)arg;
2132 KASSERT(*sizep == sizeof(*fpregset), ("invalid size"));
2133 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK);
2134 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2135 fill_fpregs32(td, fpregset);
2137 fill_fpregs(td, fpregset);
2139 sbuf_bcat(sb, fpregset, sizeof(*fpregset));
2140 free(fpregset, M_TEMP);
2142 *sizep = sizeof(*fpregset);
2146 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep)
2149 elf_thrmisc_t thrmisc;
2151 td = (struct thread *)arg;
2153 KASSERT(*sizep == sizeof(thrmisc), ("invalid size"));
2154 bzero(&thrmisc._pad, sizeof(thrmisc._pad));
2155 strcpy(thrmisc.pr_tname, td->td_name);
2156 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc));
2158 *sizep = sizeof(thrmisc);
2162 __elfN(note_ptlwpinfo)(void *arg, struct sbuf *sb, size_t *sizep)
2167 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2168 struct ptrace_lwpinfo32 pl;
2170 struct ptrace_lwpinfo pl;
2173 td = (struct thread *)arg;
2174 size = sizeof(structsize) + sizeof(pl);
2176 KASSERT(*sizep == size, ("invalid size"));
2177 structsize = sizeof(pl);
2178 sbuf_bcat(sb, &structsize, sizeof(structsize));
2179 bzero(&pl, sizeof(pl));
2180 pl.pl_lwpid = td->td_tid;
2181 pl.pl_event = PL_EVENT_NONE;
2182 pl.pl_sigmask = td->td_sigmask;
2183 pl.pl_siglist = td->td_siglist;
2184 if (td->td_si.si_signo != 0) {
2185 pl.pl_event = PL_EVENT_SIGNAL;
2186 pl.pl_flags |= PL_FLAG_SI;
2187 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2188 siginfo_to_siginfo32(&td->td_si, &pl.pl_siginfo);
2190 pl.pl_siginfo = td->td_si;
2193 strcpy(pl.pl_tdname, td->td_name);
2194 /* XXX TODO: supply more information in struct ptrace_lwpinfo*/
2195 sbuf_bcat(sb, &pl, sizeof(pl));
2201 * Allow for MD specific notes, as well as any MD
2202 * specific preparations for writing MI notes.
2205 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep)
2211 td = (struct thread *)arg;
2213 if (size != 0 && sb != NULL)
2214 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK);
2218 __elfN(dump_thread)(td, buf, &size);
2219 KASSERT(sb == NULL || *sizep == size, ("invalid size"));
2220 if (size != 0 && sb != NULL)
2221 sbuf_bcat(sb, buf, size);
2226 #ifdef KINFO_PROC_SIZE
2227 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
2231 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep)
2237 p = (struct proc *)arg;
2238 size = sizeof(structsize) + p->p_numthreads *
2239 sizeof(elf_kinfo_proc_t);
2242 KASSERT(*sizep == size, ("invalid size"));
2243 structsize = sizeof(elf_kinfo_proc_t);
2244 sbuf_bcat(sb, &structsize, sizeof(structsize));
2246 kern_proc_out(p, sb, ELF_KERN_PROC_MASK);
2251 #ifdef KINFO_FILE_SIZE
2252 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE);
2256 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep)
2259 size_t size, sect_sz, i;
2260 ssize_t start_len, sect_len;
2261 int structsize, filedesc_flags;
2263 if (coredump_pack_fileinfo)
2264 filedesc_flags = KERN_FILEDESC_PACK_KINFO;
2268 p = (struct proc *)arg;
2269 structsize = sizeof(struct kinfo_file);
2272 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2273 sbuf_set_drain(sb, sbuf_drain_count, &size);
2274 sbuf_bcat(sb, &structsize, sizeof(structsize));
2276 kern_proc_filedesc_out(p, sb, -1, filedesc_flags);
2281 sbuf_start_section(sb, &start_len);
2283 sbuf_bcat(sb, &structsize, sizeof(structsize));
2285 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize),
2288 sect_len = sbuf_end_section(sb, start_len, 0, 0);
2293 KASSERT(sect_sz <= *sizep,
2294 ("kern_proc_filedesc_out did not respect maxlen; "
2295 "requested %zu, got %zu", *sizep - sizeof(structsize),
2296 sect_sz - sizeof(structsize)));
2298 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++)
2303 #ifdef KINFO_VMENTRY_SIZE
2304 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE);
2308 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep)
2312 int structsize, vmmap_flags;
2314 if (coredump_pack_vmmapinfo)
2315 vmmap_flags = KERN_VMMAP_PACK_KINFO;
2319 p = (struct proc *)arg;
2320 structsize = sizeof(struct kinfo_vmentry);
2323 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2324 sbuf_set_drain(sb, sbuf_drain_count, &size);
2325 sbuf_bcat(sb, &structsize, sizeof(structsize));
2327 kern_proc_vmmap_out(p, sb, -1, vmmap_flags);
2332 sbuf_bcat(sb, &structsize, sizeof(structsize));
2334 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize),
2340 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep)
2346 p = (struct proc *)arg;
2347 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t);
2349 KASSERT(*sizep == size, ("invalid size"));
2350 structsize = sizeof(gid_t);
2351 sbuf_bcat(sb, &structsize, sizeof(structsize));
2352 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups *
2359 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep)
2365 p = (struct proc *)arg;
2366 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask);
2368 KASSERT(*sizep == size, ("invalid size"));
2369 structsize = sizeof(p->p_fd->fd_cmask);
2370 sbuf_bcat(sb, &structsize, sizeof(structsize));
2371 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask));
2377 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep)
2380 struct rlimit rlim[RLIM_NLIMITS];
2384 p = (struct proc *)arg;
2385 size = sizeof(structsize) + sizeof(rlim);
2387 KASSERT(*sizep == size, ("invalid size"));
2388 structsize = sizeof(rlim);
2389 sbuf_bcat(sb, &structsize, sizeof(structsize));
2391 for (i = 0; i < RLIM_NLIMITS; i++)
2392 lim_rlimit_proc(p, i, &rlim[i]);
2394 sbuf_bcat(sb, rlim, sizeof(rlim));
2400 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep)
2406 p = (struct proc *)arg;
2407 size = sizeof(structsize) + sizeof(p->p_osrel);
2409 KASSERT(*sizep == size, ("invalid size"));
2410 structsize = sizeof(p->p_osrel);
2411 sbuf_bcat(sb, &structsize, sizeof(structsize));
2412 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel));
2418 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep)
2421 elf_ps_strings_t ps_strings;
2425 p = (struct proc *)arg;
2426 size = sizeof(structsize) + sizeof(ps_strings);
2428 KASSERT(*sizep == size, ("invalid size"));
2429 structsize = sizeof(ps_strings);
2430 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2431 ps_strings = PTROUT(p->p_sysent->sv_psstrings);
2433 ps_strings = p->p_sysent->sv_psstrings;
2435 sbuf_bcat(sb, &structsize, sizeof(structsize));
2436 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings));
2442 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep)
2448 p = (struct proc *)arg;
2451 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2452 sbuf_set_drain(sb, sbuf_drain_count, &size);
2453 sbuf_bcat(sb, &structsize, sizeof(structsize));
2455 proc_getauxv(curthread, p, sb);
2461 structsize = sizeof(Elf_Auxinfo);
2462 sbuf_bcat(sb, &structsize, sizeof(structsize));
2464 proc_getauxv(curthread, p, sb);
2470 __elfN(parse_notes)(struct image_params *imgp, Elf_Note *checknote,
2471 const char *note_vendor, const Elf_Phdr *pnote,
2472 boolean_t (*cb)(const Elf_Note *, void *, boolean_t *), void *cb_arg)
2474 const Elf_Note *note, *note0, *note_end;
2475 const char *note_name;
2480 /* We need some limit, might as well use PAGE_SIZE. */
2481 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE)
2483 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes");
2484 if (pnote->p_offset > PAGE_SIZE ||
2485 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) {
2486 VOP_UNLOCK(imgp->vp, 0);
2487 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK);
2488 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
2489 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz,
2490 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED,
2491 curthread->td_ucred, NOCRED, NULL, curthread);
2493 uprintf("i/o error PT_NOTE\n");
2496 note = note0 = (const Elf_Note *)buf;
2497 note_end = (const Elf_Note *)(buf + pnote->p_filesz);
2499 note = note0 = (const Elf_Note *)(imgp->image_header +
2501 note_end = (const Elf_Note *)(imgp->image_header +
2502 pnote->p_offset + pnote->p_filesz);
2505 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) {
2506 if (!aligned(note, Elf32_Addr) || (const char *)note_end -
2507 (const char *)note < sizeof(Elf_Note)) {
2510 if (note->n_namesz != checknote->n_namesz ||
2511 note->n_descsz != checknote->n_descsz ||
2512 note->n_type != checknote->n_type)
2514 note_name = (const char *)(note + 1);
2515 if (note_name + checknote->n_namesz >=
2516 (const char *)note_end || strncmp(note_vendor,
2517 note_name, checknote->n_namesz) != 0)
2520 if (cb(note, cb_arg, &res))
2523 note = (const Elf_Note *)((const char *)(note + 1) +
2524 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) +
2525 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE));
2534 struct brandnote_cb_arg {
2535 Elf_Brandnote *brandnote;
2540 brandnote_cb(const Elf_Note *note, void *arg0, boolean_t *res)
2542 struct brandnote_cb_arg *arg;
2547 * Fetch the osreldate for binary from the ELF OSABI-note if
2550 *res = (arg->brandnote->flags & BN_TRANSLATE_OSREL) != 0 &&
2551 arg->brandnote->trans_osrel != NULL ?
2552 arg->brandnote->trans_osrel(note, arg->osrel) : TRUE;
2557 static Elf_Note fctl_note = {
2558 .n_namesz = sizeof(FREEBSD_ABI_VENDOR),
2559 .n_descsz = sizeof(uint32_t),
2560 .n_type = NT_FREEBSD_FEATURE_CTL,
2563 struct fctl_cb_arg {
2568 note_fctl_cb(const Elf_Note *note, void *arg0, boolean_t *res)
2570 struct fctl_cb_arg *arg;
2571 const Elf32_Word *desc;
2575 p = (uintptr_t)(note + 1);
2576 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
2577 desc = (const Elf32_Word *)p;
2578 *arg->fctl0 = desc[0];
2583 * Try to find the appropriate ABI-note section for checknote, fetch
2584 * the osreldate and feature control flags for binary from the ELF
2585 * OSABI-note. Only the first page of the image is searched, the same
2589 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *brandnote,
2590 int32_t *osrel, uint32_t *fctl0)
2592 const Elf_Phdr *phdr;
2593 const Elf_Ehdr *hdr;
2594 struct brandnote_cb_arg b_arg;
2595 struct fctl_cb_arg f_arg;
2598 hdr = (const Elf_Ehdr *)imgp->image_header;
2599 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
2600 b_arg.brandnote = brandnote;
2601 b_arg.osrel = osrel;
2602 f_arg.fctl0 = fctl0;
2604 for (i = 0; i < hdr->e_phnum; i++) {
2605 if (phdr[i].p_type == PT_NOTE && __elfN(parse_notes)(imgp,
2606 &brandnote->hdr, brandnote->vendor, &phdr[i], brandnote_cb,
2608 for (j = 0; j < hdr->e_phnum; j++) {
2609 if (phdr[j].p_type == PT_NOTE &&
2610 __elfN(parse_notes)(imgp, &fctl_note,
2611 FREEBSD_ABI_VENDOR, &phdr[j],
2612 note_fctl_cb, &f_arg))
2623 * Tell kern_execve.c about it, with a little help from the linker.
2625 static struct execsw __elfN(execsw) = {
2626 .ex_imgact = __CONCAT(exec_, __elfN(imgact)),
2627 .ex_name = __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
2629 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
2632 __elfN(trans_prot)(Elf_Word flags)
2638 prot |= VM_PROT_EXECUTE;
2640 prot |= VM_PROT_WRITE;
2642 prot |= VM_PROT_READ;
2643 #if __ELF_WORD_SIZE == 32 && (defined(__amd64__) || defined(__i386__))
2644 if (i386_read_exec && (flags & PF_R))
2645 prot |= VM_PROT_EXECUTE;
2651 __elfN(untrans_prot)(vm_prot_t prot)
2656 if (prot & VM_PROT_EXECUTE)
2658 if (prot & VM_PROT_READ)
2660 if (prot & VM_PROT_WRITE)