2 * Copyright (c) 2000 David O'Brien
3 * Copyright (c) 1995-1996 Søren Schmidt
4 * Copyright (c) 1996 Peter Wemm
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer
12 * in this position and unchanged.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include "opt_capsicum.h"
35 #include "opt_compat.h"
38 #include <sys/param.h>
39 #include <sys/capsicum.h>
41 #include <sys/fcntl.h>
43 #include <sys/imgact.h>
44 #include <sys/imgact_elf.h>
46 #include <sys/kernel.h>
48 #include <sys/malloc.h>
49 #include <sys/mount.h>
51 #include <sys/namei.h>
52 #include <sys/pioctl.h>
54 #include <sys/procfs.h>
55 #include <sys/racct.h>
56 #include <sys/resourcevar.h>
57 #include <sys/rwlock.h>
59 #include <sys/sf_buf.h>
61 #include <sys/systm.h>
62 #include <sys/signalvar.h>
65 #include <sys/syscall.h>
66 #include <sys/sysctl.h>
67 #include <sys/sysent.h>
68 #include <sys/vnode.h>
69 #include <sys/syslog.h>
70 #include <sys/eventhandler.h>
74 #include <vm/vm_kern.h>
75 #include <vm/vm_param.h>
77 #include <vm/vm_map.h>
78 #include <vm/vm_object.h>
79 #include <vm/vm_extern.h>
81 #include <machine/elf.h>
82 #include <machine/md_var.h>
84 #define ELF_NOTE_ROUNDSIZE 4
85 #define OLD_EI_BRAND 8
87 static int __elfN(check_header)(const Elf_Ehdr *hdr);
88 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp,
89 const char *interp, int interp_name_len, int32_t *osrel);
90 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
91 u_long *entry, size_t pagesize);
92 static int __elfN(load_section)(struct image_params *imgp, vm_offset_t offset,
93 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
95 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp);
96 static boolean_t __elfN(freebsd_trans_osrel)(const Elf_Note *note,
98 static boolean_t kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel);
99 static boolean_t __elfN(check_note)(struct image_params *imgp,
100 Elf_Brandnote *checknote, int32_t *osrel);
101 static vm_prot_t __elfN(trans_prot)(Elf_Word);
102 static Elf_Word __elfN(untrans_prot)(vm_prot_t);
104 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0,
107 #define CORE_BUF_SIZE (16 * 1024)
109 int __elfN(fallback_brand) = -1;
110 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
111 fallback_brand, CTLFLAG_RWTUN, &__elfN(fallback_brand), 0,
112 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort");
114 static int elf_legacy_coredump = 0;
115 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW,
116 &elf_legacy_coredump, 0, "");
118 int __elfN(nxstack) =
119 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */
124 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
125 nxstack, CTLFLAG_RW, &__elfN(nxstack), 0,
126 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack");
128 #if __ELF_WORD_SIZE == 32
129 #if defined(__amd64__)
130 int i386_read_exec = 0;
131 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0,
132 "enable execution from readable segments");
136 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS];
138 #define trunc_page_ps(va, ps) ((va) & ~(ps - 1))
139 #define round_page_ps(va, ps) (((va) + (ps - 1)) & ~(ps - 1))
140 #define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a))
142 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD";
144 Elf_Brandnote __elfN(freebsd_brandnote) = {
145 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR),
146 .hdr.n_descsz = sizeof(int32_t),
148 .vendor = FREEBSD_ABI_VENDOR,
149 .flags = BN_TRANSLATE_OSREL,
150 .trans_osrel = __elfN(freebsd_trans_osrel)
154 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel)
158 p = (uintptr_t)(note + 1);
159 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
160 *osrel = *(const int32_t *)(p);
165 static const char GNU_ABI_VENDOR[] = "GNU";
166 static int GNU_KFREEBSD_ABI_DESC = 3;
168 Elf_Brandnote __elfN(kfreebsd_brandnote) = {
169 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
170 .hdr.n_descsz = 16, /* XXX at least 16 */
172 .vendor = GNU_ABI_VENDOR,
173 .flags = BN_TRANSLATE_OSREL,
174 .trans_osrel = kfreebsd_trans_osrel
178 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel)
180 const Elf32_Word *desc;
183 p = (uintptr_t)(note + 1);
184 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE);
186 desc = (const Elf32_Word *)p;
187 if (desc[0] != GNU_KFREEBSD_ABI_DESC)
191 * Debian GNU/kFreeBSD embed the earliest compatible kernel version
192 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way.
194 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3];
200 __elfN(insert_brand_entry)(Elf_Brandinfo *entry)
204 for (i = 0; i < MAX_BRANDS; i++) {
205 if (elf_brand_list[i] == NULL) {
206 elf_brand_list[i] = entry;
210 if (i == MAX_BRANDS) {
211 printf("WARNING: %s: could not insert brandinfo entry: %p\n",
219 __elfN(remove_brand_entry)(Elf_Brandinfo *entry)
223 for (i = 0; i < MAX_BRANDS; i++) {
224 if (elf_brand_list[i] == entry) {
225 elf_brand_list[i] = NULL;
235 __elfN(brand_inuse)(Elf_Brandinfo *entry)
240 sx_slock(&allproc_lock);
241 FOREACH_PROC_IN_SYSTEM(p) {
242 if (p->p_sysent == entry->sysvec) {
247 sx_sunlock(&allproc_lock);
252 static Elf_Brandinfo *
253 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
254 int interp_name_len, int32_t *osrel)
256 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
262 * We support four types of branding -- (1) the ELF EI_OSABI field
263 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
264 * branding w/in the ELF header, (3) path of the `interp_path'
265 * field, and (4) the ".note.ABI-tag" ELF section.
268 /* Look for an ".note.ABI-tag" ELF section */
269 for (i = 0; i < MAX_BRANDS; i++) {
270 bi = elf_brand_list[i];
273 if (hdr->e_machine == bi->machine && (bi->flags &
274 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
275 ret = __elfN(check_note)(imgp, bi->brand_note, osrel);
281 /* If the executable has a brand, search for it in the brand list. */
282 for (i = 0; i < MAX_BRANDS; i++) {
283 bi = elf_brand_list[i];
284 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
286 if (hdr->e_machine == bi->machine &&
287 (hdr->e_ident[EI_OSABI] == bi->brand ||
288 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
289 bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0))
293 /* No known brand, see if the header is recognized by any brand */
294 for (i = 0; i < MAX_BRANDS; i++) {
295 bi = elf_brand_list[i];
296 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY ||
297 bi->header_supported == NULL)
299 if (hdr->e_machine == bi->machine) {
300 ret = bi->header_supported(imgp);
306 /* Lacking a known brand, search for a recognized interpreter. */
307 if (interp != NULL) {
308 for (i = 0; i < MAX_BRANDS; i++) {
309 bi = elf_brand_list[i];
310 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
312 if (hdr->e_machine == bi->machine &&
313 /* ELF image p_filesz includes terminating zero */
314 strlen(bi->interp_path) + 1 == interp_name_len &&
315 strncmp(interp, bi->interp_path, interp_name_len)
321 /* Lacking a recognized interpreter, try the default brand */
322 for (i = 0; i < MAX_BRANDS; i++) {
323 bi = elf_brand_list[i];
324 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
326 if (hdr->e_machine == bi->machine &&
327 __elfN(fallback_brand) == bi->brand)
334 __elfN(check_header)(const Elf_Ehdr *hdr)
340 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
341 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
342 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
343 hdr->e_phentsize != sizeof(Elf_Phdr) ||
344 hdr->e_version != ELF_TARG_VER)
348 * Make sure we have at least one brand for this machine.
351 for (i = 0; i < MAX_BRANDS; i++) {
352 bi = elf_brand_list[i];
353 if (bi != NULL && bi->machine == hdr->e_machine)
363 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
364 vm_offset_t start, vm_offset_t end, vm_prot_t prot)
371 * Create the page if it doesn't exist yet. Ignore errors.
374 vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end),
375 VM_PROT_ALL, VM_PROT_ALL, 0);
379 * Find the page from the underlying object.
382 sf = vm_imgact_map_page(object, offset);
384 return (KERN_FAILURE);
385 off = offset - trunc_page(offset);
386 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start,
388 vm_imgact_unmap_page(sf);
390 return (KERN_FAILURE);
394 return (KERN_SUCCESS);
398 __elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
399 vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow)
406 if (start != trunc_page(start)) {
407 rv = __elfN(map_partial)(map, object, offset, start,
408 round_page(start), prot);
411 offset += round_page(start) - start;
412 start = round_page(start);
414 if (end != round_page(end)) {
415 rv = __elfN(map_partial)(map, object, offset +
416 trunc_page(end) - start, trunc_page(end), end, prot);
419 end = trunc_page(end);
422 if (offset & PAGE_MASK) {
424 * The mapping is not page aligned. This means we have
425 * to copy the data. Sigh.
427 rv = vm_map_find(map, NULL, 0, &start, end - start, 0,
428 VMFS_NO_SPACE, prot | VM_PROT_WRITE, VM_PROT_ALL,
433 return (KERN_SUCCESS);
434 for (; start < end; start += sz) {
435 sf = vm_imgact_map_page(object, offset);
437 return (KERN_FAILURE);
438 off = offset - trunc_page(offset);
440 if (sz > PAGE_SIZE - off)
441 sz = PAGE_SIZE - off;
442 error = copyout((caddr_t)sf_buf_kva(sf) + off,
444 vm_imgact_unmap_page(sf);
446 return (KERN_FAILURE);
452 vm_object_reference(object);
454 rv = vm_map_insert(map, object, offset, start, end,
455 prot, VM_PROT_ALL, cow);
457 if (rv != KERN_SUCCESS)
458 vm_object_deallocate(object);
462 return (KERN_SUCCESS);
467 __elfN(load_section)(struct image_params *imgp, vm_offset_t offset,
468 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
475 vm_offset_t map_addr;
478 vm_offset_t file_addr;
481 * It's necessary to fail if the filsz + offset taken from the
482 * header is greater than the actual file pager object's size.
483 * If we were to allow this, then the vm_map_find() below would
484 * walk right off the end of the file object and into the ether.
486 * While I'm here, might as well check for something else that
487 * is invalid: filsz cannot be greater than memsz.
489 if ((off_t)filsz + offset > imgp->attr->va_size || filsz > memsz) {
490 uprintf("elf_load_section: truncated ELF file\n");
494 object = imgp->object;
495 map = &imgp->proc->p_vmspace->vm_map;
496 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize);
497 file_addr = trunc_page_ps(offset, pagesize);
500 * We have two choices. We can either clear the data in the last page
501 * of an oversized mapping, or we can start the anon mapping a page
502 * early and copy the initialized data into that first page. We
503 * choose the second..
506 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr;
508 map_len = round_page_ps(offset + filsz, pagesize) - file_addr;
511 /* cow flags: don't dump readonly sections in core */
512 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
513 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
515 rv = __elfN(map_insert)(map,
517 file_addr, /* file offset */
518 map_addr, /* virtual start */
519 map_addr + map_len,/* virtual end */
522 if (rv != KERN_SUCCESS)
525 /* we can stop now if we've covered it all */
526 if (memsz == filsz) {
533 * We have to get the remaining bit of the file into the first part
534 * of the oversized map segment. This is normally because the .data
535 * segment in the file is extended to provide bss. It's a neat idea
536 * to try and save a page, but it's a pain in the behind to implement.
538 copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize);
539 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize);
540 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) -
543 /* This had damn well better be true! */
545 rv = __elfN(map_insert)(map, NULL, 0, map_addr, map_addr +
546 map_len, VM_PROT_ALL, 0);
547 if (rv != KERN_SUCCESS) {
555 sf = vm_imgact_map_page(object, offset + filsz);
559 /* send the page fragment to user space */
560 off = trunc_page_ps(offset + filsz, pagesize) -
561 trunc_page(offset + filsz);
562 error = copyout((caddr_t)sf_buf_kva(sf) + off,
563 (caddr_t)map_addr, copy_len);
564 vm_imgact_unmap_page(sf);
571 * set it to the specified protection.
572 * XXX had better undo the damage from pasting over the cracks here!
574 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr +
575 map_len), prot, FALSE);
581 * Load the file "file" into memory. It may be either a shared object
584 * The "addr" reference parameter is in/out. On entry, it specifies
585 * the address where a shared object should be loaded. If the file is
586 * an executable, this value is ignored. On exit, "addr" specifies
587 * where the file was actually loaded.
589 * The "entry" reference parameter is out only. On exit, it specifies
590 * the entry point for the loaded file.
593 __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
594 u_long *entry, size_t pagesize)
599 struct image_params image_params;
601 const Elf_Ehdr *hdr = NULL;
602 const Elf_Phdr *phdr = NULL;
603 struct nameidata *nd;
605 struct image_params *imgp;
608 u_long base_addr = 0;
609 int error, i, numsegs;
611 #ifdef CAPABILITY_MODE
613 * XXXJA: This check can go away once we are sufficiently confident
614 * that the checks in namei() are correct.
616 if (IN_CAPABILITY_MODE(curthread))
620 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
622 attr = &tempdata->attr;
623 imgp = &tempdata->image_params;
626 * Initialize part of the common data
630 imgp->firstpage = NULL;
631 imgp->image_header = NULL;
633 imgp->execlabel = NULL;
635 NDINIT(nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, curthread);
636 if ((error = namei(nd)) != 0) {
640 NDFREE(nd, NDF_ONLY_PNBUF);
641 imgp->vp = nd->ni_vp;
644 * Check permissions, modes, uid, etc on the file, and "open" it.
646 error = exec_check_permissions(imgp);
650 error = exec_map_first_page(imgp);
655 * Also make certain that the interpreter stays the same, so set
656 * its VV_TEXT flag, too.
658 VOP_SET_TEXT(nd->ni_vp);
660 imgp->object = nd->ni_vp->v_object;
662 hdr = (const Elf_Ehdr *)imgp->image_header;
663 if ((error = __elfN(check_header)(hdr)) != 0)
665 if (hdr->e_type == ET_DYN)
667 else if (hdr->e_type == ET_EXEC)
674 /* Only support headers that fit within first page for now */
675 if ((hdr->e_phoff > PAGE_SIZE) ||
676 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
681 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
682 if (!aligned(phdr, Elf_Addr)) {
687 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
688 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) {
689 /* Loadable segment */
690 prot = __elfN(trans_prot)(phdr[i].p_flags);
691 error = __elfN(load_section)(imgp, phdr[i].p_offset,
692 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase,
693 phdr[i].p_memsz, phdr[i].p_filesz, prot, pagesize);
697 * Establish the base address if this is the
701 base_addr = trunc_page(phdr[i].p_vaddr +
707 *entry = (unsigned long)hdr->e_entry + rbase;
711 exec_unmap_first_page(imgp);
716 free(tempdata, M_TEMP);
722 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
724 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
725 const Elf_Phdr *phdr;
726 Elf_Auxargs *elf_auxargs;
727 struct vmspace *vmspace;
729 u_long text_size = 0, data_size = 0, total_size = 0;
730 u_long text_addr = 0, data_addr = 0;
731 u_long seg_size, seg_addr;
732 u_long addr, baddr, et_dyn_addr, entry = 0, proghdr = 0;
734 int error = 0, i, n, interp_name_len = 0;
735 const char *interp = NULL, *newinterp = NULL;
736 Elf_Brandinfo *brand_info;
738 struct sysentvec *sv;
741 * Do we have a valid ELF header ?
743 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later
744 * if particular brand doesn't support it.
746 if (__elfN(check_header)(hdr) != 0 ||
747 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
751 * From here on down, we return an errno, not -1, as we've
752 * detected an ELF file.
755 if ((hdr->e_phoff > PAGE_SIZE) ||
756 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) {
757 /* Only support headers in first page for now */
760 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
761 if (!aligned(phdr, Elf_Addr))
765 for (i = 0; i < hdr->e_phnum; i++) {
766 switch (phdr[i].p_type) {
769 baddr = phdr[i].p_vaddr;
773 /* Path to interpreter */
774 if (phdr[i].p_filesz > MAXPATHLEN ||
775 phdr[i].p_offset > PAGE_SIZE ||
776 phdr[i].p_filesz > PAGE_SIZE - phdr[i].p_offset)
778 interp = imgp->image_header + phdr[i].p_offset;
779 interp_name_len = phdr[i].p_filesz;
784 __elfN(trans_prot)(phdr[i].p_flags);
789 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len,
791 if (brand_info == NULL) {
792 uprintf("ELF binary type \"%u\" not known.\n",
793 hdr->e_ident[EI_OSABI]);
796 if (hdr->e_type == ET_DYN) {
797 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0)
800 * Honour the base load address from the dso if it is
801 * non-zero for some reason.
804 et_dyn_addr = ET_DYN_LOAD_ADDR;
809 sv = brand_info->sysvec;
810 if (interp != NULL && brand_info->interp_newpath != NULL)
811 newinterp = brand_info->interp_newpath;
814 * Avoid a possible deadlock if the current address space is destroyed
815 * and that address space maps the locked vnode. In the common case,
816 * the locked vnode's v_usecount is decremented but remains greater
817 * than zero. Consequently, the vnode lock is not needed by vrele().
818 * However, in cases where the vnode lock is external, such as nullfs,
819 * v_usecount may become zero.
821 * The VV_TEXT flag prevents modifications to the executable while
822 * the vnode is unlocked.
824 VOP_UNLOCK(imgp->vp, 0);
826 error = exec_new_vmspace(imgp, sv);
827 imgp->proc->p_sysent = sv;
829 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
833 for (i = 0; i < hdr->e_phnum; i++) {
834 switch (phdr[i].p_type) {
835 case PT_LOAD: /* Loadable segment */
836 if (phdr[i].p_memsz == 0)
838 prot = __elfN(trans_prot)(phdr[i].p_flags);
839 error = __elfN(load_section)(imgp, phdr[i].p_offset,
840 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr,
841 phdr[i].p_memsz, phdr[i].p_filesz, prot,
847 * If this segment contains the program headers,
848 * remember their virtual address for the AT_PHDR
849 * aux entry. Static binaries don't usually include
852 if (phdr[i].p_offset == 0 &&
853 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize
855 proghdr = phdr[i].p_vaddr + hdr->e_phoff +
858 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
859 seg_size = round_page(phdr[i].p_memsz +
860 phdr[i].p_vaddr + et_dyn_addr - seg_addr);
863 * Make the largest executable segment the official
864 * text segment and all others data.
866 * Note that obreak() assumes that data_addr +
867 * data_size == end of data load area, and the ELF
868 * file format expects segments to be sorted by
869 * address. If multiple data segments exist, the
870 * last one will be used.
873 if (phdr[i].p_flags & PF_X && text_size < seg_size) {
874 text_size = seg_size;
875 text_addr = seg_addr;
877 data_size = seg_size;
878 data_addr = seg_addr;
880 total_size += seg_size;
882 case PT_PHDR: /* Program header table info */
883 proghdr = phdr[i].p_vaddr + et_dyn_addr;
890 if (data_addr == 0 && data_size == 0) {
891 data_addr = text_addr;
892 data_size = text_size;
895 entry = (u_long)hdr->e_entry + et_dyn_addr;
898 * Check limits. It should be safe to check the
899 * limits after loading the segments since we do
900 * not actually fault in all the segments pages.
902 PROC_LOCK(imgp->proc);
903 if (data_size > lim_cur(imgp->proc, RLIMIT_DATA) ||
904 text_size > maxtsiz ||
905 total_size > lim_cur(imgp->proc, RLIMIT_VMEM) ||
906 racct_set(imgp->proc, RACCT_DATA, data_size) != 0 ||
907 racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) {
908 PROC_UNLOCK(imgp->proc);
912 vmspace = imgp->proc->p_vmspace;
913 vmspace->vm_tsize = text_size >> PAGE_SHIFT;
914 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
915 vmspace->vm_dsize = data_size >> PAGE_SHIFT;
916 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
919 * We load the dynamic linker where a userland call
920 * to mmap(0, ...) would put it. The rationale behind this
921 * calculation is that it leaves room for the heap to grow to
922 * its maximum allowed size.
924 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(imgp->proc,
926 PROC_UNLOCK(imgp->proc);
928 imgp->entry_addr = entry;
930 if (interp != NULL) {
931 int have_interp = FALSE;
932 VOP_UNLOCK(imgp->vp, 0);
933 if (brand_info->emul_path != NULL &&
934 brand_info->emul_path[0] != '\0') {
935 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
936 snprintf(path, MAXPATHLEN, "%s%s",
937 brand_info->emul_path, interp);
938 error = __elfN(load_file)(imgp->proc, path, &addr,
939 &imgp->entry_addr, sv->sv_pagesize);
944 if (!have_interp && newinterp != NULL) {
945 error = __elfN(load_file)(imgp->proc, newinterp, &addr,
946 &imgp->entry_addr, sv->sv_pagesize);
951 error = __elfN(load_file)(imgp->proc, interp, &addr,
952 &imgp->entry_addr, sv->sv_pagesize);
954 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
956 uprintf("ELF interpreter %s not found\n", interp);
963 * Construct auxargs table (used by the fixup routine)
965 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
966 elf_auxargs->execfd = -1;
967 elf_auxargs->phdr = proghdr;
968 elf_auxargs->phent = hdr->e_phentsize;
969 elf_auxargs->phnum = hdr->e_phnum;
970 elf_auxargs->pagesz = PAGE_SIZE;
971 elf_auxargs->base = addr;
972 elf_auxargs->flags = 0;
973 elf_auxargs->entry = entry;
975 imgp->auxargs = elf_auxargs;
976 imgp->interpreted = 0;
977 imgp->reloc_base = addr;
978 imgp->proc->p_osrel = osrel;
983 #define suword __CONCAT(suword, __ELF_WORD_SIZE)
986 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp)
988 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
992 base = (Elf_Addr *)*stack_base;
993 pos = base + (imgp->args->argc + imgp->args->envc + 2);
995 if (args->execfd != -1)
996 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
997 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
998 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
999 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
1000 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
1001 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
1002 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
1003 AUXARGS_ENTRY(pos, AT_BASE, args->base);
1004 if (imgp->execpathp != 0)
1005 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp);
1006 AUXARGS_ENTRY(pos, AT_OSRELDATE,
1007 imgp->proc->p_ucred->cr_prison->pr_osreldate);
1008 if (imgp->canary != 0) {
1009 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary);
1010 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen);
1012 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus);
1013 if (imgp->pagesizes != 0) {
1014 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes);
1015 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen);
1017 if (imgp->sysent->sv_timekeep_base != 0) {
1018 AUXARGS_ENTRY(pos, AT_TIMEKEEP,
1019 imgp->sysent->sv_timekeep_base);
1021 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj
1022 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot :
1023 imgp->sysent->sv_stackprot);
1024 AUXARGS_ENTRY(pos, AT_NULL, 0);
1026 free(imgp->auxargs, M_TEMP);
1027 imgp->auxargs = NULL;
1030 suword(base, (long)imgp->args->argc);
1031 *stack_base = (register_t *)base;
1036 * Code for generating ELF core dumps.
1039 typedef void (*segment_callback)(vm_map_entry_t, void *);
1041 /* Closure for cb_put_phdr(). */
1042 struct phdr_closure {
1043 Elf_Phdr *phdr; /* Program header to fill in */
1044 Elf_Off offset; /* Offset of segment in core file */
1047 /* Closure for cb_size_segment(). */
1048 struct sseg_closure {
1049 int count; /* Count of writable segments. */
1050 size_t size; /* Total size of all writable segments. */
1053 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *);
1056 int type; /* Note type. */
1057 outfunc_t outfunc; /* Output function. */
1058 void *outarg; /* Argument for the output function. */
1059 size_t outsize; /* Output size. */
1060 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */
1063 TAILQ_HEAD(note_info_list, note_info);
1065 /* Coredump output parameters. */
1066 struct coredump_params {
1068 struct ucred *active_cred;
1069 struct ucred *file_cred;
1072 struct gzio_stream *gzs;
1075 static void cb_put_phdr(vm_map_entry_t, void *);
1076 static void cb_size_segment(vm_map_entry_t, void *);
1077 static int core_write(struct coredump_params *, void *, size_t, off_t,
1079 static void each_writable_segment(struct thread *, segment_callback, void *);
1080 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t,
1081 struct note_info_list *, size_t);
1082 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *,
1084 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t);
1085 static void __elfN(putnote)(struct note_info *, struct sbuf *);
1086 static size_t register_note(struct note_info_list *, int, outfunc_t, void *);
1087 static int sbuf_drain_core_output(void *, const char *, int);
1088 static int sbuf_drain_count(void *arg, const char *data, int len);
1090 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *);
1091 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *);
1092 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *);
1093 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *);
1094 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *);
1095 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *);
1096 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *);
1097 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *);
1098 static void note_procstat_files(void *, struct sbuf *, size_t *);
1099 static void note_procstat_groups(void *, struct sbuf *, size_t *);
1100 static void note_procstat_osrel(void *, struct sbuf *, size_t *);
1101 static void note_procstat_rlimit(void *, struct sbuf *, size_t *);
1102 static void note_procstat_umask(void *, struct sbuf *, size_t *);
1103 static void note_procstat_vmmap(void *, struct sbuf *, size_t *);
1106 extern int compress_user_cores_gzlevel;
1109 * Write out a core segment to the compression stream.
1112 compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len)
1118 chunk_len = MIN(len, CORE_BUF_SIZE);
1119 copyin(base, buf, chunk_len);
1120 error = gzio_write(p->gzs, buf, chunk_len);
1130 core_gz_write(void *base, size_t len, off_t offset, void *arg)
1133 return (core_write((struct coredump_params *)arg, base, len, offset,
1139 core_write(struct coredump_params *p, void *base, size_t len, off_t offset,
1143 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, base, len, offset,
1144 seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED,
1145 p->active_cred, p->file_cred, NULL, p->td));
1149 core_output(void *base, size_t len, off_t offset, struct coredump_params *p,
1155 return (compress_chunk(p, base, tmpbuf, len));
1157 return (core_write(p, base, len, offset, UIO_USERSPACE));
1161 * Drain into a core file.
1164 sbuf_drain_core_output(void *arg, const char *data, int len)
1166 struct coredump_params *p;
1169 p = (struct coredump_params *)arg;
1172 * Some kern_proc out routines that print to this sbuf may
1173 * call us with the process lock held. Draining with the
1174 * non-sleepable lock held is unsafe. The lock is needed for
1175 * those routines when dumping a live process. In our case we
1176 * can safely release the lock before draining and acquire
1179 locked = PROC_LOCKED(p->td->td_proc);
1181 PROC_UNLOCK(p->td->td_proc);
1184 error = gzio_write(p->gzs, __DECONST(char *, data), len);
1187 error = core_write(p, __DECONST(void *, data), len, p->offset,
1190 PROC_LOCK(p->td->td_proc);
1198 * Drain into a counter.
1201 sbuf_drain_count(void *arg, const char *data __unused, int len)
1205 sizep = (size_t *)arg;
1211 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags)
1213 struct ucred *cred = td->td_ucred;
1215 struct sseg_closure seginfo;
1216 struct note_info_list notelst;
1217 struct coredump_params params;
1218 struct note_info *ninfo;
1220 size_t hdrsize, notesz, coresize;
1223 compress = (flags & IMGACT_CORE_COMPRESS) != 0;
1225 TAILQ_INIT(¬elst);
1227 /* Size the program segments. */
1230 each_writable_segment(td, cb_size_segment, &seginfo);
1233 * Collect info about the core file header area.
1235 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count);
1236 __elfN(prepare_notes)(td, ¬elst, ¬esz);
1237 coresize = round_page(hdrsize + notesz) + seginfo.size;
1240 PROC_LOCK(td->td_proc);
1241 error = racct_add(td->td_proc, RACCT_CORE, coresize);
1242 PROC_UNLOCK(td->td_proc);
1248 if (coresize >= limit) {
1253 /* Set up core dump parameters. */
1255 params.active_cred = cred;
1256 params.file_cred = NOCRED;
1263 /* Create a compression stream if necessary. */
1265 params.gzs = gzio_init(core_gz_write, GZIO_DEFLATE,
1266 CORE_BUF_SIZE, compress_user_cores_gzlevel, ¶ms);
1267 if (params.gzs == NULL) {
1271 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO);
1276 * Allocate memory for building the header, fill it up,
1277 * and write it out following the notes.
1279 hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
1284 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst,
1287 /* Write the contents of all of the writable segments. */
1293 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
1294 offset = round_page(hdrsize + notesz);
1295 for (i = 0; i < seginfo.count; i++) {
1296 error = core_output((caddr_t)(uintptr_t)php->p_vaddr,
1297 php->p_filesz, offset, ¶ms, tmpbuf);
1300 offset += php->p_filesz;
1304 if (error == 0 && compress)
1305 error = gzio_flush(params.gzs);
1310 "Failed to write core file for process %s (error %d)\n",
1311 curproc->p_comm, error);
1317 free(tmpbuf, M_TEMP);
1318 gzio_fini(params.gzs);
1321 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) {
1322 TAILQ_REMOVE(¬elst, ninfo, link);
1323 free(ninfo, M_TEMP);
1332 * A callback for each_writable_segment() to write out the segment's
1333 * program header entry.
1336 cb_put_phdr(entry, closure)
1337 vm_map_entry_t entry;
1340 struct phdr_closure *phc = (struct phdr_closure *)closure;
1341 Elf_Phdr *phdr = phc->phdr;
1343 phc->offset = round_page(phc->offset);
1345 phdr->p_type = PT_LOAD;
1346 phdr->p_offset = phc->offset;
1347 phdr->p_vaddr = entry->start;
1349 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1350 phdr->p_align = PAGE_SIZE;
1351 phdr->p_flags = __elfN(untrans_prot)(entry->protection);
1353 phc->offset += phdr->p_filesz;
1358 * A callback for each_writable_segment() to gather information about
1359 * the number of segments and their total size.
1362 cb_size_segment(entry, closure)
1363 vm_map_entry_t entry;
1366 struct sseg_closure *ssc = (struct sseg_closure *)closure;
1369 ssc->size += entry->end - entry->start;
1373 * For each writable segment in the process's memory map, call the given
1374 * function with a pointer to the map entry and some arbitrary
1375 * caller-supplied data.
1378 each_writable_segment(td, func, closure)
1380 segment_callback func;
1383 struct proc *p = td->td_proc;
1384 vm_map_t map = &p->p_vmspace->vm_map;
1385 vm_map_entry_t entry;
1386 vm_object_t backing_object, object;
1387 boolean_t ignore_entry;
1389 vm_map_lock_read(map);
1390 for (entry = map->header.next; entry != &map->header;
1391 entry = entry->next) {
1393 * Don't dump inaccessible mappings, deal with legacy
1396 * Note that read-only segments related to the elf binary
1397 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1398 * need to arbitrarily ignore such segments.
1400 if (elf_legacy_coredump) {
1401 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW)
1404 if ((entry->protection & VM_PROT_ALL) == 0)
1409 * Dont include memory segment in the coredump if
1410 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1411 * madvise(2). Do not dump submaps (i.e. parts of the
1414 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP))
1417 if ((object = entry->object.vm_object) == NULL)
1420 /* Ignore memory-mapped devices and such things. */
1421 VM_OBJECT_RLOCK(object);
1422 while ((backing_object = object->backing_object) != NULL) {
1423 VM_OBJECT_RLOCK(backing_object);
1424 VM_OBJECT_RUNLOCK(object);
1425 object = backing_object;
1427 ignore_entry = object->type != OBJT_DEFAULT &&
1428 object->type != OBJT_SWAP && object->type != OBJT_VNODE &&
1429 object->type != OBJT_PHYS;
1430 VM_OBJECT_RUNLOCK(object);
1434 (*func)(entry, closure);
1436 vm_map_unlock_read(map);
1440 * Write the core file header to the file, including padding up to
1441 * the page boundary.
1444 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr,
1445 size_t hdrsize, struct note_info_list *notelst, size_t notesz)
1447 struct note_info *ninfo;
1451 /* Fill in the header. */
1452 bzero(hdr, hdrsize);
1453 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz);
1455 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN);
1456 sbuf_set_drain(sb, sbuf_drain_core_output, p);
1457 sbuf_start_section(sb, NULL);
1458 sbuf_bcat(sb, hdr, hdrsize);
1459 TAILQ_FOREACH(ninfo, notelst, link)
1460 __elfN(putnote)(ninfo, sb);
1461 /* Align up to a page boundary for the program segments. */
1462 sbuf_end_section(sb, -1, PAGE_SIZE, 0);
1463 error = sbuf_finish(sb);
1470 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list,
1480 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p);
1483 * To have the debugger select the right thread (LWP) as the initial
1484 * thread, we dump the state of the thread passed to us in td first.
1485 * This is the thread that causes the core dump and thus likely to
1486 * be the right thread one wants to have selected in the debugger.
1489 while (thr != NULL) {
1490 size += register_note(list, NT_PRSTATUS,
1491 __elfN(note_prstatus), thr);
1492 size += register_note(list, NT_FPREGSET,
1493 __elfN(note_fpregset), thr);
1494 size += register_note(list, NT_THRMISC,
1495 __elfN(note_thrmisc), thr);
1496 size += register_note(list, -1,
1497 __elfN(note_threadmd), thr);
1499 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) :
1500 TAILQ_NEXT(thr, td_plist);
1502 thr = TAILQ_NEXT(thr, td_plist);
1505 size += register_note(list, NT_PROCSTAT_PROC,
1506 __elfN(note_procstat_proc), p);
1507 size += register_note(list, NT_PROCSTAT_FILES,
1508 note_procstat_files, p);
1509 size += register_note(list, NT_PROCSTAT_VMMAP,
1510 note_procstat_vmmap, p);
1511 size += register_note(list, NT_PROCSTAT_GROUPS,
1512 note_procstat_groups, p);
1513 size += register_note(list, NT_PROCSTAT_UMASK,
1514 note_procstat_umask, p);
1515 size += register_note(list, NT_PROCSTAT_RLIMIT,
1516 note_procstat_rlimit, p);
1517 size += register_note(list, NT_PROCSTAT_OSREL,
1518 note_procstat_osrel, p);
1519 size += register_note(list, NT_PROCSTAT_PSSTRINGS,
1520 __elfN(note_procstat_psstrings), p);
1521 size += register_note(list, NT_PROCSTAT_AUXV,
1522 __elfN(note_procstat_auxv), p);
1528 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs,
1533 struct phdr_closure phc;
1535 ehdr = (Elf_Ehdr *)hdr;
1536 phdr = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr));
1538 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1539 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1540 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1541 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1542 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1543 ehdr->e_ident[EI_DATA] = ELF_DATA;
1544 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1545 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
1546 ehdr->e_ident[EI_ABIVERSION] = 0;
1547 ehdr->e_ident[EI_PAD] = 0;
1548 ehdr->e_type = ET_CORE;
1549 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1550 ehdr->e_machine = ELF_ARCH32;
1552 ehdr->e_machine = ELF_ARCH;
1554 ehdr->e_version = EV_CURRENT;
1556 ehdr->e_phoff = sizeof(Elf_Ehdr);
1558 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1559 ehdr->e_phentsize = sizeof(Elf_Phdr);
1560 ehdr->e_phnum = numsegs + 1;
1561 ehdr->e_shentsize = sizeof(Elf_Shdr);
1563 ehdr->e_shstrndx = SHN_UNDEF;
1566 * Fill in the program header entries.
1569 /* The note segement. */
1570 phdr->p_type = PT_NOTE;
1571 phdr->p_offset = hdrsize;
1574 phdr->p_filesz = notesz;
1576 phdr->p_flags = PF_R;
1577 phdr->p_align = ELF_NOTE_ROUNDSIZE;
1580 /* All the writable segments from the program. */
1582 phc.offset = round_page(hdrsize + notesz);
1583 each_writable_segment(td, cb_put_phdr, &phc);
1587 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg)
1589 struct note_info *ninfo;
1590 size_t size, notesize;
1593 out(arg, NULL, &size);
1594 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK);
1596 ninfo->outfunc = out;
1597 ninfo->outarg = arg;
1598 ninfo->outsize = size;
1599 TAILQ_INSERT_TAIL(list, ninfo, link);
1604 notesize = sizeof(Elf_Note) + /* note header */
1605 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
1607 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
1613 append_note_data(const void *src, void *dst, size_t len)
1617 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE);
1619 bcopy(src, dst, len);
1620 bzero((char *)dst + len, padded_len - len);
1622 return (padded_len);
1626 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp)
1634 note = (Elf_Note *)buf;
1635 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR);
1636 note->n_descsz = size;
1637 note->n_type = type;
1638 buf += sizeof(*note);
1639 buf += append_note_data(FREEBSD_ABI_VENDOR, buf,
1640 sizeof(FREEBSD_ABI_VENDOR));
1641 append_note_data(src, buf, size);
1646 notesize = sizeof(Elf_Note) + /* note header */
1647 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) +
1649 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */
1655 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb)
1660 if (ninfo->type == -1) {
1661 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
1665 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR);
1666 note.n_descsz = ninfo->outsize;
1667 note.n_type = ninfo->type;
1669 sbuf_bcat(sb, ¬e, sizeof(note));
1670 sbuf_start_section(sb, &old_len);
1671 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR));
1672 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
1673 if (note.n_descsz == 0)
1675 sbuf_start_section(sb, &old_len);
1676 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize);
1677 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0);
1681 * Miscellaneous note out functions.
1684 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1685 #include <compat/freebsd32/freebsd32.h>
1687 typedef struct prstatus32 elf_prstatus_t;
1688 typedef struct prpsinfo32 elf_prpsinfo_t;
1689 typedef struct fpreg32 elf_prfpregset_t;
1690 typedef struct fpreg32 elf_fpregset_t;
1691 typedef struct reg32 elf_gregset_t;
1692 typedef struct thrmisc32 elf_thrmisc_t;
1693 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32
1694 typedef struct kinfo_proc32 elf_kinfo_proc_t;
1695 typedef uint32_t elf_ps_strings_t;
1697 typedef prstatus_t elf_prstatus_t;
1698 typedef prpsinfo_t elf_prpsinfo_t;
1699 typedef prfpregset_t elf_prfpregset_t;
1700 typedef prfpregset_t elf_fpregset_t;
1701 typedef gregset_t elf_gregset_t;
1702 typedef thrmisc_t elf_thrmisc_t;
1703 #define ELF_KERN_PROC_MASK 0
1704 typedef struct kinfo_proc elf_kinfo_proc_t;
1705 typedef vm_offset_t elf_ps_strings_t;
1709 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep)
1712 elf_prpsinfo_t *psinfo;
1714 p = (struct proc *)arg;
1716 KASSERT(*sizep == sizeof(*psinfo), ("invalid size"));
1717 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK);
1718 psinfo->pr_version = PRPSINFO_VERSION;
1719 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t);
1720 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
1722 * XXX - We don't fill in the command line arguments properly
1725 strlcpy(psinfo->pr_psargs, p->p_comm,
1726 sizeof(psinfo->pr_psargs));
1728 sbuf_bcat(sb, psinfo, sizeof(*psinfo));
1729 free(psinfo, M_TEMP);
1731 *sizep = sizeof(*psinfo);
1735 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep)
1738 elf_prstatus_t *status;
1740 td = (struct thread *)arg;
1742 KASSERT(*sizep == sizeof(*status), ("invalid size"));
1743 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK);
1744 status->pr_version = PRSTATUS_VERSION;
1745 status->pr_statussz = sizeof(elf_prstatus_t);
1746 status->pr_gregsetsz = sizeof(elf_gregset_t);
1747 status->pr_fpregsetsz = sizeof(elf_fpregset_t);
1748 status->pr_osreldate = osreldate;
1749 status->pr_cursig = td->td_proc->p_sig;
1750 status->pr_pid = td->td_tid;
1751 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1752 fill_regs32(td, &status->pr_reg);
1754 fill_regs(td, &status->pr_reg);
1756 sbuf_bcat(sb, status, sizeof(*status));
1757 free(status, M_TEMP);
1759 *sizep = sizeof(*status);
1763 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep)
1766 elf_prfpregset_t *fpregset;
1768 td = (struct thread *)arg;
1770 KASSERT(*sizep == sizeof(*fpregset), ("invalid size"));
1771 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK);
1772 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1773 fill_fpregs32(td, fpregset);
1775 fill_fpregs(td, fpregset);
1777 sbuf_bcat(sb, fpregset, sizeof(*fpregset));
1778 free(fpregset, M_TEMP);
1780 *sizep = sizeof(*fpregset);
1784 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep)
1787 elf_thrmisc_t thrmisc;
1789 td = (struct thread *)arg;
1791 KASSERT(*sizep == sizeof(thrmisc), ("invalid size"));
1792 bzero(&thrmisc._pad, sizeof(thrmisc._pad));
1793 strcpy(thrmisc.pr_tname, td->td_name);
1794 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc));
1796 *sizep = sizeof(thrmisc);
1800 * Allow for MD specific notes, as well as any MD
1801 * specific preparations for writing MI notes.
1804 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep)
1810 td = (struct thread *)arg;
1812 if (size != 0 && sb != NULL)
1813 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK);
1817 __elfN(dump_thread)(td, buf, &size);
1818 KASSERT(sb == NULL || *sizep == size, ("invalid size"));
1819 if (size != 0 && sb != NULL)
1820 sbuf_bcat(sb, buf, size);
1825 #ifdef KINFO_PROC_SIZE
1826 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
1830 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep)
1836 p = (struct proc *)arg;
1837 size = sizeof(structsize) + p->p_numthreads *
1838 sizeof(elf_kinfo_proc_t);
1841 KASSERT(*sizep == size, ("invalid size"));
1842 structsize = sizeof(elf_kinfo_proc_t);
1843 sbuf_bcat(sb, &structsize, sizeof(structsize));
1844 sx_slock(&proctree_lock);
1846 kern_proc_out(p, sb, ELF_KERN_PROC_MASK);
1847 sx_sunlock(&proctree_lock);
1852 #ifdef KINFO_FILE_SIZE
1853 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE);
1857 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep)
1863 p = (struct proc *)arg;
1866 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
1867 sbuf_set_drain(sb, sbuf_drain_count, &size);
1868 sbuf_bcat(sb, &structsize, sizeof(structsize));
1870 kern_proc_filedesc_out(p, sb, -1);
1875 structsize = sizeof(struct kinfo_file);
1876 sbuf_bcat(sb, &structsize, sizeof(structsize));
1878 kern_proc_filedesc_out(p, sb, -1);
1882 #ifdef KINFO_VMENTRY_SIZE
1883 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE);
1887 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep)
1893 p = (struct proc *)arg;
1896 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
1897 sbuf_set_drain(sb, sbuf_drain_count, &size);
1898 sbuf_bcat(sb, &structsize, sizeof(structsize));
1900 kern_proc_vmmap_out(p, sb);
1905 structsize = sizeof(struct kinfo_vmentry);
1906 sbuf_bcat(sb, &structsize, sizeof(structsize));
1908 kern_proc_vmmap_out(p, sb);
1913 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep)
1919 p = (struct proc *)arg;
1920 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t);
1922 KASSERT(*sizep == size, ("invalid size"));
1923 structsize = sizeof(gid_t);
1924 sbuf_bcat(sb, &structsize, sizeof(structsize));
1925 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups *
1932 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep)
1938 p = (struct proc *)arg;
1939 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask);
1941 KASSERT(*sizep == size, ("invalid size"));
1942 structsize = sizeof(p->p_fd->fd_cmask);
1943 sbuf_bcat(sb, &structsize, sizeof(structsize));
1944 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask));
1950 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep)
1953 struct rlimit rlim[RLIM_NLIMITS];
1957 p = (struct proc *)arg;
1958 size = sizeof(structsize) + sizeof(rlim);
1960 KASSERT(*sizep == size, ("invalid size"));
1961 structsize = sizeof(rlim);
1962 sbuf_bcat(sb, &structsize, sizeof(structsize));
1964 for (i = 0; i < RLIM_NLIMITS; i++)
1965 lim_rlimit(p, i, &rlim[i]);
1967 sbuf_bcat(sb, rlim, sizeof(rlim));
1973 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep)
1979 p = (struct proc *)arg;
1980 size = sizeof(structsize) + sizeof(p->p_osrel);
1982 KASSERT(*sizep == size, ("invalid size"));
1983 structsize = sizeof(p->p_osrel);
1984 sbuf_bcat(sb, &structsize, sizeof(structsize));
1985 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel));
1991 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep)
1994 elf_ps_strings_t ps_strings;
1998 p = (struct proc *)arg;
1999 size = sizeof(structsize) + sizeof(ps_strings);
2001 KASSERT(*sizep == size, ("invalid size"));
2002 structsize = sizeof(ps_strings);
2003 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
2004 ps_strings = PTROUT(p->p_sysent->sv_psstrings);
2006 ps_strings = p->p_sysent->sv_psstrings;
2008 sbuf_bcat(sb, &structsize, sizeof(structsize));
2009 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings));
2015 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep)
2021 p = (struct proc *)arg;
2024 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN);
2025 sbuf_set_drain(sb, sbuf_drain_count, &size);
2026 sbuf_bcat(sb, &structsize, sizeof(structsize));
2028 proc_getauxv(curthread, p, sb);
2034 structsize = sizeof(Elf_Auxinfo);
2035 sbuf_bcat(sb, &structsize, sizeof(structsize));
2037 proc_getauxv(curthread, p, sb);
2043 __elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote,
2044 int32_t *osrel, const Elf_Phdr *pnote)
2046 const Elf_Note *note, *note0, *note_end;
2047 const char *note_name;
2050 if (pnote == NULL || pnote->p_offset > PAGE_SIZE ||
2051 pnote->p_filesz > PAGE_SIZE - pnote->p_offset)
2054 note = note0 = (const Elf_Note *)(imgp->image_header + pnote->p_offset);
2055 note_end = (const Elf_Note *)(imgp->image_header +
2056 pnote->p_offset + pnote->p_filesz);
2057 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) {
2058 if (!aligned(note, Elf32_Addr) || (const char *)note_end -
2059 (const char *)note < sizeof(Elf_Note))
2061 if (note->n_namesz != checknote->hdr.n_namesz ||
2062 note->n_descsz != checknote->hdr.n_descsz ||
2063 note->n_type != checknote->hdr.n_type)
2065 note_name = (const char *)(note + 1);
2066 if (note_name + checknote->hdr.n_namesz >=
2067 (const char *)note_end || strncmp(checknote->vendor,
2068 note_name, checknote->hdr.n_namesz) != 0)
2072 * Fetch the osreldate for binary
2073 * from the ELF OSABI-note if necessary.
2075 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 &&
2076 checknote->trans_osrel != NULL)
2077 return (checknote->trans_osrel(note, osrel));
2081 note = (const Elf_Note *)((const char *)(note + 1) +
2082 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) +
2083 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE));
2090 * Try to find the appropriate ABI-note section for checknote,
2091 * fetch the osreldate for binary from the ELF OSABI-note. Only the
2092 * first page of the image is searched, the same as for headers.
2095 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote,
2098 const Elf_Phdr *phdr;
2099 const Elf_Ehdr *hdr;
2102 hdr = (const Elf_Ehdr *)imgp->image_header;
2103 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
2105 for (i = 0; i < hdr->e_phnum; i++) {
2106 if (phdr[i].p_type == PT_NOTE &&
2107 __elfN(parse_notes)(imgp, checknote, osrel, &phdr[i]))
2115 * Tell kern_execve.c about it, with a little help from the linker.
2117 static struct execsw __elfN(execsw) = {
2118 __CONCAT(exec_, __elfN(imgact)),
2119 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
2121 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
2124 __elfN(trans_prot)(Elf_Word flags)
2130 prot |= VM_PROT_EXECUTE;
2132 prot |= VM_PROT_WRITE;
2134 prot |= VM_PROT_READ;
2135 #if __ELF_WORD_SIZE == 32
2136 #if defined(__amd64__)
2137 if (i386_read_exec && (flags & PF_R))
2138 prot |= VM_PROT_EXECUTE;
2145 __elfN(untrans_prot)(vm_prot_t prot)
2150 if (prot & VM_PROT_EXECUTE)
2152 if (prot & VM_PROT_READ)
2154 if (prot & VM_PROT_WRITE)