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.
30 * $FreeBSD: src/sys/kern/imgact_elf.c,v 1.73.2.13 2002/12/28 19:49:41 dillon Exp $
33 #include <sys/param.h>
35 #include <sys/fcntl.h>
37 #include <sys/imgact.h>
38 #include <sys/imgact_elf.h>
39 #include <sys/kernel.h>
40 #include <sys/malloc.h>
42 #include <sys/systm.h>
44 #include <sys/nlookup.h>
45 #include <sys/pioctl.h>
46 #include <sys/procfs.h>
47 #include <sys/resourcevar.h>
48 #include <sys/signalvar.h>
50 #include <sys/syscall.h>
51 #include <sys/sysctl.h>
52 #include <sys/sysent.h>
53 #include <sys/vnode.h>
54 #include <sys/eventhandler.h>
56 #include <cpu/lwbuf.h>
59 #include <vm/vm_kern.h>
60 #include <vm/vm_param.h>
63 #include <vm/vm_map.h>
64 #include <vm/vm_object.h>
65 #include <vm/vm_extern.h>
67 #include <machine/elf.h>
68 #include <machine/md_var.h>
69 #include <sys/mount.h>
72 #define OLD_EI_BRAND 8
73 #define truncps(va,ps) ((va) & ~(ps - 1))
74 #define aligned(a,t) (truncps((u_long)(a), sizeof(t)) == (u_long)(a))
76 static int __elfN(check_header)(const Elf_Ehdr *hdr);
77 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp,
78 const char *interp, int32_t *osrel);
79 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
81 static int __elfN(load_section)(struct proc *p,
82 struct vmspace *vmspace, struct vnode *vp,
83 vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz,
85 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp);
86 static boolean_t __elfN(bsd_trans_osrel)(const Elf_Note *note,
88 static boolean_t __elfN(check_note)(struct image_params *imgp,
89 Elf_Brandnote *checknote, int32_t *osrel);
90 static vm_prot_t __elfN(trans_prot)(Elf_Word);
91 static Elf_Word __elfN(untrans_prot)(vm_prot_t);
92 static boolean_t check_PT_NOTE(struct image_params *imgp,
93 Elf_Brandnote *checknote, int32_t *osrel, const Elf_Phdr * pnote);
94 static boolean_t extract_interpreter(struct image_params *imgp,
95 const Elf_Phdr *pinterpreter, char *data);
97 static int elf_legacy_coredump = 0;
98 static int __elfN(fallback_brand) = -1;
99 #if defined(__x86_64__)
100 SYSCTL_NODE(_kern, OID_AUTO, elf64, CTLFLAG_RW, 0, "");
101 SYSCTL_INT(_debug, OID_AUTO, elf64_legacy_coredump, CTLFLAG_RW,
102 &elf_legacy_coredump, 0, "legacy coredump mode");
103 SYSCTL_INT(_kern_elf64, OID_AUTO, fallback_brand, CTLFLAG_RW,
104 &elf64_fallback_brand, 0, "ELF64 brand of last resort");
105 TUNABLE_INT("kern.elf64.fallback_brand", &elf64_fallback_brand);
106 #else /* i386 assumed */
107 SYSCTL_NODE(_kern, OID_AUTO, elf32, CTLFLAG_RW, 0, "");
108 SYSCTL_INT(_debug, OID_AUTO, elf32_legacy_coredump, CTLFLAG_RW,
109 &elf_legacy_coredump, 0, "legacy coredump mode");
110 SYSCTL_INT(_kern_elf32, OID_AUTO, fallback_brand, CTLFLAG_RW,
111 &elf32_fallback_brand, 0, "ELF32 brand of last resort");
112 TUNABLE_INT("kern.elf32.fallback_brand", &elf32_fallback_brand);
115 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS];
117 static const char DRAGONFLY_ABI_VENDOR[] = "DragonFly";
118 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD";
120 Elf_Brandnote __elfN(dragonfly_brandnote) = {
121 .hdr.n_namesz = sizeof(DRAGONFLY_ABI_VENDOR),
122 .hdr.n_descsz = sizeof(int32_t),
124 .vendor = DRAGONFLY_ABI_VENDOR,
125 .flags = BN_TRANSLATE_OSREL,
126 .trans_osrel = __elfN(bsd_trans_osrel),
129 Elf_Brandnote __elfN(freebsd_brandnote) = {
130 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR),
131 .hdr.n_descsz = sizeof(int32_t),
133 .vendor = FREEBSD_ABI_VENDOR,
134 .flags = BN_TRANSLATE_OSREL,
135 .trans_osrel = __elfN(bsd_trans_osrel),
139 __elfN(insert_brand_entry)(Elf_Brandinfo *entry)
143 for (i = 0; i < MAX_BRANDS; i++) {
144 if (elf_brand_list[i] == NULL) {
145 elf_brand_list[i] = entry;
149 if (i == MAX_BRANDS) {
150 uprintf("WARNING: %s: could not insert brandinfo entry: %p\n",
158 __elfN(remove_brand_entry)(Elf_Brandinfo *entry)
162 for (i = 0; i < MAX_BRANDS; i++) {
163 if (elf_brand_list[i] == entry) {
164 elf_brand_list[i] = NULL;
174 * Check if an elf brand is being used anywhere in the system.
176 * Used by the linux emulation module unloader. This isn't safe from
179 struct elf_brand_inuse_info {
181 Elf_Brandinfo *entry;
184 static int elf_brand_inuse_callback(struct proc *p, void *data);
187 __elfN(brand_inuse)(Elf_Brandinfo *entry)
189 struct elf_brand_inuse_info info;
193 allproc_scan(elf_brand_inuse_callback, &info);
199 elf_brand_inuse_callback(struct proc *p, void *data)
201 struct elf_brand_inuse_info *info = data;
203 if (p->p_sysent == info->entry->sysvec) {
211 __elfN(check_header)(const Elf_Ehdr *hdr)
217 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
218 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
219 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
220 hdr->e_phentsize != sizeof(Elf_Phdr) ||
221 hdr->e_ehsize != sizeof(Elf_Ehdr) ||
222 hdr->e_version != ELF_TARG_VER)
226 * Make sure we have at least one brand for this machine.
229 for (i = 0; i < MAX_BRANDS; i++) {
230 bi = elf_brand_list[i];
231 if (bi != NULL && bi->machine == hdr->e_machine)
241 __elfN(load_section)(struct proc *p, struct vmspace *vmspace, struct vnode *vp,
242 vm_offset_t offset, caddr_t vmaddr, size_t memsz,
243 size_t filsz, vm_prot_t prot)
246 vm_offset_t map_addr;
252 vm_offset_t file_addr;
254 object = vp->v_object;
258 * In most cases we will be able to use a shared lock on the
259 * object we are inserting into the map. The lock will be
260 * upgraded in situations where new VM pages must be allocated.
262 vm_object_hold_shared(object);
266 * It's necessary to fail if the filsz + offset taken from the
267 * header is greater than the actual file pager object's size.
268 * If we were to allow this, then the vm_map_find() below would
269 * walk right off the end of the file object and into the ether.
271 * While I'm here, might as well check for something else that
272 * is invalid: filsz cannot be greater than memsz.
274 if ((off_t)filsz + offset > vp->v_filesize || filsz > memsz) {
275 uprintf("elf_load_section: truncated ELF file\n");
276 vm_object_drop(object);
280 map_addr = trunc_page((vm_offset_t)vmaddr);
281 file_addr = trunc_page(offset);
284 * We have two choices. We can either clear the data in the last page
285 * of an oversized mapping, or we can start the anon mapping a page
286 * early and copy the initialized data into that first page. We
287 * choose the second..
290 map_len = trunc_page(offset+filsz) - file_addr;
292 map_len = round_page(offset+filsz) - file_addr;
295 vm_object_reference_locked(object);
297 /* cow flags: don't dump readonly sections in core */
298 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT;
299 if ((prot & VM_PROT_WRITE) == 0)
300 cow |= MAP_DISABLE_COREDUMP;
302 cow |= MAP_PREFAULT_RELOCK;
304 count = vm_map_entry_reserve(MAP_RESERVE_COUNT);
305 vm_map_lock(&vmspace->vm_map);
306 rv = vm_map_insert(&vmspace->vm_map, &count,
308 file_addr, /* file offset */
309 map_addr, /* virtual start */
310 map_addr + map_len,/* virtual end */
314 vm_map_unlock(&vmspace->vm_map);
315 vm_map_entry_release(count);
318 * NOTE: Object must have a hold ref when calling
319 * vm_object_deallocate().
321 if (rv != KERN_SUCCESS) {
322 vm_object_drop(object);
323 vm_object_deallocate(object);
327 /* we can stop now if we've covered it all */
328 if (memsz == filsz) {
329 vm_object_drop(object);
335 * We have to get the remaining bit of the file into the first part
336 * of the oversized map segment. This is normally because the .data
337 * segment in the file is extended to provide bss. It's a neat idea
338 * to try and save a page, but it's a pain in the behind to implement.
340 copy_len = (offset + filsz) - trunc_page(offset + filsz);
341 map_addr = trunc_page((vm_offset_t)vmaddr + filsz);
342 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr;
344 /* This had damn well better be true! */
346 count = vm_map_entry_reserve(MAP_RESERVE_COUNT);
347 vm_map_lock(&vmspace->vm_map);
348 rv = vm_map_insert(&vmspace->vm_map, &count,
354 VM_PROT_ALL, VM_PROT_ALL,
356 vm_map_unlock(&vmspace->vm_map);
357 vm_map_entry_release(count);
358 if (rv != KERN_SUCCESS) {
359 vm_object_drop(object);
366 struct lwbuf lwb_cache;
369 m = vm_fault_object_page(object, trunc_page(offset + filsz),
370 VM_PROT_READ, 0, &shared, &error);
371 vm_object_drop(object);
373 lwb = lwbuf_alloc(m, &lwb_cache);
374 error = copyout((caddr_t)lwbuf_kva(lwb),
375 (caddr_t)map_addr, copy_len);
380 vm_object_drop(object);
384 * set it to the specified protection
387 vm_map_protect(&vmspace->vm_map,
388 map_addr, map_addr + map_len,
395 * Load the file "file" into memory. It may be either a shared object
398 * The "addr" reference parameter is in/out. On entry, it specifies
399 * the address where a shared object should be loaded. If the file is
400 * an executable, this value is ignored. On exit, "addr" specifies
401 * where the file was actually loaded.
403 * The "entry" reference parameter is out only. On exit, it specifies
404 * the entry point for the loaded file.
407 __elfN(load_file)(struct proc *p, const char *file, u_long *addr, u_long *entry)
410 struct nlookupdata nd;
412 struct image_params image_params;
414 const Elf_Ehdr *hdr = NULL;
415 const Elf_Phdr *phdr = NULL;
416 struct nlookupdata *nd;
417 struct vmspace *vmspace = p->p_vmspace;
419 struct image_params *imgp;
420 struct mount *topmnt;
423 u_long base_addr = 0;
424 int error, i, numsegs;
426 tempdata = kmalloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
428 attr = &tempdata->attr;
429 imgp = &tempdata->image_params;
432 * Initialize part of the common data
436 imgp->firstpage = NULL;
437 imgp->image_header = NULL;
440 error = nlookup_init(nd, file, UIO_SYSSPACE, NLC_FOLLOW);
444 error = cache_vget(&nd->nl_nch, nd->nl_cred,
445 LK_SHARED, &imgp->vp);
446 topmnt = nd->nl_nch.mount;
452 * Check permissions, modes, uid, etc on the file, and "open" it.
454 error = exec_check_permissions(imgp, topmnt);
460 error = exec_map_first_page(imgp);
462 * Also make certain that the interpreter stays the same, so set
463 * its VTEXT flag, too.
466 vsetflags(imgp->vp, VTEXT);
471 hdr = (const Elf_Ehdr *)imgp->image_header;
472 if ((error = __elfN(check_header)(hdr)) != 0)
474 if (hdr->e_type == ET_DYN)
476 else if (hdr->e_type == ET_EXEC)
483 /* Only support headers that fit within first page for now */
484 /* (multiplication of two Elf_Half fields will not overflow) */
485 if ((hdr->e_phoff > PAGE_SIZE) ||
486 (hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE - hdr->e_phoff) {
491 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
492 if (!aligned(phdr, Elf_Addr)) {
497 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
498 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) {
499 /* Loadable segment */
500 prot = __elfN(trans_prot)(phdr[i].p_flags);
501 error = __elfN(load_section)(
502 p, vmspace, imgp->vp,
504 (caddr_t)phdr[i].p_vaddr +
507 phdr[i].p_filesz, prot);
511 * Establish the base address if this is the
515 base_addr = trunc_page(phdr[i].p_vaddr + rbase);
520 *entry = (unsigned long)hdr->e_entry + rbase;
524 exec_unmap_first_page(imgp);
529 kfree(tempdata, M_TEMP);
534 static Elf_Brandinfo *
535 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
538 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
543 /* We support four types of branding -- (1) the ELF EI_OSABI field
544 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
545 * branding within the ELF header, (3) path of the `interp_path' field,
546 * and (4) the ".note.ABI-tag" ELF section.
549 /* Look for an ".note.ABI-tag" ELF section */
550 for (i = 0; i < MAX_BRANDS; i++) {
551 bi = elf_brand_list[i];
555 if (hdr->e_machine == bi->machine && (bi->flags &
556 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
557 ret = __elfN(check_note)(imgp, bi->brand_note, osrel);
563 /* If the executable has a brand, search for it in the brand list. */
564 for (i = 0; i < MAX_BRANDS; i++) {
565 bi = elf_brand_list[i];
567 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
569 if (hdr->e_machine == bi->machine &&
570 (hdr->e_ident[EI_OSABI] == bi->brand ||
571 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
572 bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0))
576 /* Lacking a known brand, search for a recognized interpreter. */
577 if (interp != NULL) {
578 for (i = 0; i < MAX_BRANDS; i++) {
579 bi = elf_brand_list[i];
581 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
583 if (hdr->e_machine == bi->machine &&
584 strcmp(interp, bi->interp_path) == 0)
589 /* Lacking a recognized interpreter, try the default brand */
590 for (i = 0; i < MAX_BRANDS; i++) {
591 bi = elf_brand_list[i];
593 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
595 if (hdr->e_machine == bi->machine &&
596 __elfN(fallback_brand) == bi->brand)
603 __CONCAT(exec_,__elfN(imgact))(struct image_params *imgp)
605 const Elf_Ehdr *hdr = (const Elf_Ehdr *) imgp->image_header;
606 const Elf_Phdr *phdr;
607 Elf_Auxargs *elf_auxargs;
608 struct vmspace *vmspace;
610 u_long text_size = 0, data_size = 0, total_size = 0;
611 u_long text_addr = 0, data_addr = 0;
612 u_long seg_size, seg_addr;
613 u_long addr, baddr, et_dyn_addr, entry = 0, proghdr = 0;
618 const char *newinterp = NULL;
619 Elf_Brandinfo *brand_info;
623 * Do we have a valid ELF header ?
625 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later if a particular
626 * brand doesn't support it. Both DragonFly platforms do by default.
628 if (__elfN(check_header)(hdr) != 0 ||
629 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
633 * From here on down, we return an errno, not -1, as we've
634 * detected an ELF file.
637 if ((hdr->e_phoff > PAGE_SIZE) ||
638 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) {
639 /* Only support headers in first page for now */
642 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
643 if (!aligned(phdr, Elf_Addr))
647 for (i = 0; i < hdr->e_phnum; i++) {
648 if (phdr[i].p_type == PT_LOAD) {
650 baddr = phdr[i].p_vaddr;
654 if (phdr[i].p_type == PT_INTERP) {
656 * If interp is already defined there are more than
657 * one PT_INTERP program headers present. Take only
658 * the first one and ignore the rest.
663 if (phdr[i].p_filesz == 0 ||
664 phdr[i].p_filesz > PAGE_SIZE ||
665 phdr[i].p_filesz > MAXPATHLEN)
668 interp = kmalloc(phdr[i].p_filesz, M_TEMP, M_WAITOK);
669 failure = extract_interpreter(imgp, &phdr[i], interp);
671 kfree(interp, M_TEMP);
678 brand_info = __elfN(get_brandinfo)(imgp, interp, &osrel);
679 if (brand_info == NULL) {
680 uprintf("ELF binary type \"%u\" not known.\n",
681 hdr->e_ident[EI_OSABI]);
683 kfree(interp, M_TEMP);
686 if (hdr->e_type == ET_DYN) {
687 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) {
689 kfree(interp, M_TEMP);
693 * Honour the base load address from the dso if it is
694 * non-zero for some reason.
697 et_dyn_addr = ET_DYN_LOAD_ADDR;
703 if (interp != NULL && brand_info->interp_newpath != NULL)
704 newinterp = brand_info->interp_newpath;
706 exec_new_vmspace(imgp, NULL);
709 * Yeah, I'm paranoid. There is every reason in the world to get
710 * VTEXT now since from here on out, there are places we can have
711 * a context switch. Better safe than sorry; I really don't want
712 * the file to change while it's being loaded.
714 vsetflags(imgp->vp, VTEXT);
716 vmspace = imgp->proc->p_vmspace;
718 for (i = 0; i < hdr->e_phnum; i++) {
719 switch (phdr[i].p_type) {
720 case PT_LOAD: /* Loadable segment */
721 if (phdr[i].p_memsz == 0)
723 prot = __elfN(trans_prot)(phdr[i].p_flags);
725 if ((error = __elfN(load_section)(
730 (caddr_t)phdr[i].p_vaddr + et_dyn_addr,
735 kfree (interp, M_TEMP);
740 * If this segment contains the program headers,
741 * remember their virtual address for the AT_PHDR
742 * aux entry. Static binaries don't usually include
745 if (phdr[i].p_offset == 0 &&
746 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize
748 proghdr = phdr[i].p_vaddr + hdr->e_phoff +
751 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
752 seg_size = round_page(phdr[i].p_memsz +
753 phdr[i].p_vaddr + et_dyn_addr - seg_addr);
756 * Is this .text or .data? We can't use
757 * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the
758 * alpha terribly and possibly does other bad
759 * things so we stick to the old way of figuring
760 * it out: If the segment contains the program
761 * entry point, it's a text segment, otherwise it
764 * Note that obreak() assumes that data_addr +
765 * data_size == end of data load area, and the ELF
766 * file format expects segments to be sorted by
767 * address. If multiple data segments exist, the
768 * last one will be used.
770 if (hdr->e_entry >= phdr[i].p_vaddr &&
771 hdr->e_entry < (phdr[i].p_vaddr +
773 text_size = seg_size;
774 text_addr = seg_addr;
775 entry = (u_long)hdr->e_entry + et_dyn_addr;
777 data_size = seg_size;
778 data_addr = seg_addr;
780 total_size += seg_size;
783 * Check limits. It should be safe to check the
784 * limits after loading the segment since we do
785 * not actually fault in all the segment's pages.
788 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur ||
789 text_size > maxtsiz ||
791 imgp->proc->p_rlimit[RLIMIT_VMEM].rlim_cur) {
793 kfree(interp, M_TEMP);
798 case PT_PHDR: /* Program header table info */
799 proghdr = phdr[i].p_vaddr + et_dyn_addr;
806 vmspace->vm_tsize = text_size >> PAGE_SHIFT;
807 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
808 vmspace->vm_dsize = data_size >> PAGE_SHIFT;
809 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
811 addr = ELF_RTLD_ADDR(vmspace);
813 imgp->entry_addr = entry;
815 imgp->proc->p_sysent = brand_info->sysvec;
816 EVENTHANDLER_INVOKE(process_exec, imgp);
818 if (interp != NULL) {
819 int have_interp = FALSE;
820 if (brand_info->emul_path != NULL &&
821 brand_info->emul_path[0] != '\0') {
822 path = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK);
823 ksnprintf(path, MAXPATHLEN, "%s%s",
824 brand_info->emul_path, interp);
825 error = __elfN(load_file)(imgp->proc, path, &addr,
831 if (!have_interp && newinterp != NULL) {
832 error = __elfN(load_file)(imgp->proc, newinterp,
833 &addr, &imgp->entry_addr);
838 error = __elfN(load_file)(imgp->proc, interp, &addr,
842 uprintf("ELF interpreter %s not found\n", interp);
843 kfree(interp, M_TEMP);
846 kfree(interp, M_TEMP);
851 * Construct auxargs table (used by the fixup routine)
853 elf_auxargs = kmalloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
854 elf_auxargs->execfd = -1;
855 elf_auxargs->phdr = proghdr;
856 elf_auxargs->phent = hdr->e_phentsize;
857 elf_auxargs->phnum = hdr->e_phnum;
858 elf_auxargs->pagesz = PAGE_SIZE;
859 elf_auxargs->base = addr;
860 elf_auxargs->flags = 0;
861 elf_auxargs->entry = entry;
863 imgp->auxargs = elf_auxargs;
864 imgp->interpreted = 0;
865 imgp->proc->p_osrel = osrel;
871 __elfN(dragonfly_fixup)(register_t **stack_base, struct image_params *imgp)
873 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
877 base = (Elf_Addr *)*stack_base;
878 pos = base + (imgp->args->argc + imgp->args->envc + 2);
880 if (args->execfd != -1)
881 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
882 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
883 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
884 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
885 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
886 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
887 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
888 AUXARGS_ENTRY(pos, AT_BASE, args->base);
889 if (imgp->execpathp != 0)
890 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp);
891 AUXARGS_ENTRY(pos, AT_OSRELDATE, osreldate);
892 AUXARGS_ENTRY(pos, AT_NULL, 0);
894 kfree(imgp->auxargs, M_TEMP);
895 imgp->auxargs = NULL;
898 suword(base, (long)imgp->args->argc);
899 *stack_base = (register_t *)base;
904 * Code for generating ELF core dumps.
907 typedef int (*segment_callback)(vm_map_entry_t, void *);
909 /* Closure for cb_put_phdr(). */
910 struct phdr_closure {
911 Elf_Phdr *phdr; /* Program header to fill in (incremented) */
912 Elf_Phdr *phdr_max; /* Pointer bound for error check */
913 Elf_Off offset; /* Offset of segment in core file */
916 /* Closure for cb_size_segment(). */
917 struct sseg_closure {
918 int count; /* Count of writable segments. */
919 size_t vsize; /* Total size of all writable segments. */
922 /* Closure for cb_put_fp(). */
925 struct vn_hdr *vnh_max;
930 typedef struct elf_buf {
936 static void *target_reserve(elf_buf_t target, size_t bytes, int *error);
938 static int cb_put_phdr (vm_map_entry_t, void *);
939 static int cb_size_segment (vm_map_entry_t, void *);
940 static int cb_fpcount_segment(vm_map_entry_t, void *);
941 static int cb_put_fp(vm_map_entry_t, void *);
944 static int each_segment (struct proc *, segment_callback, void *, int);
945 static int __elfN(corehdr)(struct lwp *, int, struct file *, struct ucred *,
947 enum putmode { WRITE, DRYRUN };
948 static int __elfN(puthdr)(struct lwp *, elf_buf_t, int sig, enum putmode,
950 static int elf_putallnotes(struct lwp *, elf_buf_t, int, enum putmode);
951 static int __elfN(putnote)(elf_buf_t, const char *, int, const void *, size_t);
953 static int elf_putsigs(struct lwp *, elf_buf_t);
954 static int elf_puttextvp(struct proc *, elf_buf_t);
955 static int elf_putfiles(struct proc *, elf_buf_t, struct file *);
958 __elfN(coredump)(struct lwp *lp, int sig, struct vnode *vp, off_t limit)
963 if ((error = falloc(NULL, &fp, NULL)) != 0)
965 fsetcred(fp, lp->lwp_proc->p_ucred);
970 fp->f_type = DTYPE_VNODE;
971 fp->f_flag = O_CREAT|O_WRONLY|O_NOFOLLOW;
972 fp->f_ops = &vnode_fileops;
975 error = generic_elf_coredump(lp, sig, fp, limit);
979 fp->f_ops = &badfileops;
986 generic_elf_coredump(struct lwp *lp, int sig, struct file *fp, off_t limit)
988 struct proc *p = lp->lwp_proc;
989 struct ucred *cred = p->p_ucred;
991 struct sseg_closure seginfo;
992 struct elf_buf target;
995 kprintf("can't dump core - null fp\n");
998 * Size the program segments
1002 each_segment(p, cb_size_segment, &seginfo, 1);
1005 * Calculate the size of the core file header area by making
1006 * a dry run of generating it. Nothing is written, but the
1007 * size is calculated.
1009 bzero(&target, sizeof(target));
1010 __elfN(puthdr)(lp, &target, sig, DRYRUN, seginfo.count, fp);
1012 if (target.off + seginfo.vsize >= limit)
1016 * Allocate memory for building the header, fill it up,
1019 target.off_max = target.off;
1021 target.buf = kmalloc(target.off_max, M_TEMP, M_WAITOK|M_ZERO);
1023 error = __elfN(corehdr)(lp, sig, fp, cred, seginfo.count, &target);
1025 /* Write the contents of all of the writable segments. */
1031 php = (Elf_Phdr *)(target.buf + sizeof(Elf_Ehdr)) + 1;
1032 for (i = 0; i < seginfo.count; i++) {
1033 error = fp_write(fp, (caddr_t)php->p_vaddr,
1034 php->p_filesz, &nbytes, UIO_USERSPACE);
1040 kfree(target.buf, M_TEMP);
1046 * A callback for each_segment() to write out the segment's
1047 * program header entry.
1050 cb_put_phdr(vm_map_entry_t entry, void *closure)
1052 struct phdr_closure *phc = closure;
1053 Elf_Phdr *phdr = phc->phdr;
1055 if (phc->phdr == phc->phdr_max)
1058 phc->offset = round_page(phc->offset);
1060 phdr->p_type = PT_LOAD;
1061 phdr->p_offset = phc->offset;
1062 phdr->p_vaddr = entry->start;
1064 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1065 phdr->p_align = PAGE_SIZE;
1066 phdr->p_flags = __elfN(untrans_prot)(entry->protection);
1068 phc->offset += phdr->p_filesz;
1074 * A callback for each_writable_segment() to gather information about
1075 * the number of segments and their total size.
1078 cb_size_segment(vm_map_entry_t entry, void *closure)
1080 struct sseg_closure *ssc = closure;
1083 ssc->vsize += entry->end - entry->start;
1088 * A callback for each_segment() to gather information about
1089 * the number of text segments.
1092 cb_fpcount_segment(vm_map_entry_t entry, void *closure)
1094 int *count = closure;
1097 if (entry->object.vm_object->type == OBJT_VNODE) {
1098 vp = (struct vnode *)entry->object.vm_object->handle;
1099 if ((vp->v_flag & VCKPT) && curproc->p_textvp == vp)
1107 cb_put_fp(vm_map_entry_t entry, void *closure)
1109 struct fp_closure *fpc = closure;
1110 struct vn_hdr *vnh = fpc->vnh;
1111 Elf_Phdr *phdr = &vnh->vnh_phdr;
1116 * If an entry represents a vnode then write out a file handle.
1118 * If we are checkpointing a checkpoint-restored program we do
1119 * NOT record the filehandle for the old checkpoint vnode (which
1120 * is mapped all over the place). Instead we rely on the fact
1121 * that a checkpoint-restored program does not mmap() the checkpt
1122 * vnode NOCORE, so its contents will be written out to the
1123 * new checkpoint file. This is necessary because the 'old'
1124 * checkpoint file is typically destroyed when a new one is created
1125 * and thus cannot be used to restore the new checkpoint.
1127 * Theoretically we could create a chain of checkpoint files and
1128 * operate the checkpointing operation kinda like an incremental
1129 * checkpoint, but a checkpoint restore would then likely wind up
1130 * referencing many prior checkpoint files and that is a bit over
1131 * the top for the purpose of the checkpoint API.
1133 if (entry->object.vm_object->type == OBJT_VNODE) {
1134 vp = (struct vnode *)entry->object.vm_object->handle;
1135 if ((vp->v_flag & VCKPT) && curproc->p_textvp == vp)
1137 if (vnh == fpc->vnh_max)
1141 vnh->vnh_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
1142 error = VFS_VPTOFH(vp, &vnh->vnh_fh.fh_fid);
1144 char *freepath, *fullpath;
1146 if (vn_fullpath(curproc, vp, &fullpath, &freepath, 0)) {
1147 kprintf("Warning: coredump, error %d: cannot store file handle for vnode %p\n", error, vp);
1149 kprintf("Warning: coredump, error %d: cannot store file handle for %s\n", error, fullpath);
1150 kfree(freepath, M_TEMP);
1155 phdr->p_type = PT_LOAD;
1156 phdr->p_offset = 0; /* not written to core */
1157 phdr->p_vaddr = entry->start;
1159 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1160 phdr->p_align = PAGE_SIZE;
1162 if (entry->protection & VM_PROT_READ)
1163 phdr->p_flags |= PF_R;
1164 if (entry->protection & VM_PROT_WRITE)
1165 phdr->p_flags |= PF_W;
1166 if (entry->protection & VM_PROT_EXECUTE)
1167 phdr->p_flags |= PF_X;
1175 * For each writable segment in the process's memory map, call the given
1176 * function with a pointer to the map entry and some arbitrary
1177 * caller-supplied data.
1180 each_segment(struct proc *p, segment_callback func, void *closure, int writable)
1183 vm_map_t map = &p->p_vmspace->vm_map;
1184 vm_map_entry_t entry;
1186 for (entry = map->header.next; error == 0 && entry != &map->header;
1187 entry = entry->next) {
1193 * Don't dump inaccessible mappings, deal with legacy
1196 * Note that read-only segments related to the elf binary
1197 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1198 * need to arbitrarily ignore such segments.
1200 if (elf_legacy_coredump) {
1201 if (writable && (entry->protection & VM_PROT_RW) != VM_PROT_RW)
1204 if (writable && (entry->protection & VM_PROT_ALL) == 0)
1209 * Dont include memory segment in the coredump if
1210 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1213 * Currently we only dump normal VM object maps. We do
1214 * not dump submaps or virtual page tables.
1216 if (writable && (entry->eflags & MAP_ENTRY_NOCOREDUMP))
1218 if (entry->maptype != VM_MAPTYPE_NORMAL)
1220 if ((obj = entry->object.vm_object) == NULL)
1224 * Find the bottom-most object, leaving the base object
1225 * and the bottom-most object held (but only one hold
1226 * if they happen to be the same).
1228 vm_object_hold_shared(obj);
1231 while (lobj && (tobj = lobj->backing_object) != NULL) {
1232 KKASSERT(tobj != obj);
1233 vm_object_hold_shared(tobj);
1234 if (tobj == lobj->backing_object) {
1236 vm_object_lock_swap();
1237 vm_object_drop(lobj);
1241 vm_object_drop(tobj);
1246 * The callback only applies to default, swap, or vnode
1247 * objects. Other types of objects such as memory-mapped
1248 * devices are ignored.
1250 if (lobj->type == OBJT_DEFAULT || lobj->type == OBJT_SWAP ||
1251 lobj->type == OBJT_VNODE) {
1252 error = (*func)(entry, closure);
1255 vm_object_drop(lobj);
1256 vm_object_drop(obj);
1263 target_reserve(elf_buf_t target, size_t bytes, int *error)
1268 if (target->off + bytes > target->off_max)
1271 res = target->buf + target->off;
1273 target->off += bytes;
1278 * Write the core file header to the file, including padding up to
1279 * the page boundary.
1282 __elfN(corehdr)(struct lwp *lp, int sig, struct file *fp, struct ucred *cred,
1283 int numsegs, elf_buf_t target)
1289 * Fill in the header. The fp is passed so we can detect and flag
1290 * a checkpoint file pointer within the core file itself, because
1291 * it may not be restored from the same file handle.
1293 error = __elfN(puthdr)(lp, target, sig, WRITE, numsegs, fp);
1295 /* Write it to the core file. */
1297 error = fp_write(fp, target->buf, target->off, &nbytes,
1304 __elfN(puthdr)(struct lwp *lp, elf_buf_t target, int sig, enum putmode mode,
1305 int numsegs, struct file *fp)
1307 struct proc *p = lp->lwp_proc;
1315 ehdr = target_reserve(target, sizeof(Elf_Ehdr), &error);
1317 phoff = target->off;
1318 phdr = target_reserve(target, (numsegs + 1) * sizeof(Elf_Phdr), &error);
1320 noteoff = target->off;
1322 elf_putallnotes(lp, target, sig, mode);
1323 notesz = target->off - noteoff;
1326 * put extra cruft for dumping process state here
1327 * - we really want it be before all the program
1329 * - we just need to update the offset accordingly
1330 * and GDB will be none the wiser.
1333 error = elf_puttextvp(p, target);
1335 error = elf_putsigs(lp, target);
1337 error = elf_putfiles(p, target, fp);
1340 * Align up to a page boundary for the program segments. The
1341 * actual data will be written to the outptu file, not to elf_buf_t,
1342 * so we do not have to do any further bounds checking.
1344 target->off = round_page(target->off);
1345 if (error == 0 && ehdr != NULL) {
1347 * Fill in the ELF header.
1349 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1350 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1351 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1352 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1353 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1354 ehdr->e_ident[EI_DATA] = ELF_DATA;
1355 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1356 ehdr->e_ident[EI_OSABI] = ELFOSABI_NONE;
1357 ehdr->e_ident[EI_ABIVERSION] = 0;
1358 ehdr->e_ident[EI_PAD] = 0;
1359 ehdr->e_type = ET_CORE;
1360 ehdr->e_machine = ELF_ARCH;
1361 ehdr->e_version = EV_CURRENT;
1363 ehdr->e_phoff = phoff;
1365 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1366 ehdr->e_phentsize = sizeof(Elf_Phdr);
1367 ehdr->e_phnum = numsegs + 1;
1368 ehdr->e_shentsize = sizeof(Elf_Shdr);
1370 ehdr->e_shstrndx = SHN_UNDEF;
1372 if (error == 0 && phdr != NULL) {
1374 * Fill in the program header entries.
1376 struct phdr_closure phc;
1378 /* The note segement. */
1379 phdr->p_type = PT_NOTE;
1380 phdr->p_offset = noteoff;
1383 phdr->p_filesz = notesz;
1389 /* All the writable segments from the program. */
1391 phc.phdr_max = phdr + numsegs;
1392 phc.offset = target->off;
1393 each_segment(p, cb_put_phdr, &phc, 1);
1399 * Append core dump notes to target ELF buffer or simply update target size
1400 * if dryrun selected.
1403 elf_putallnotes(struct lwp *corelp, elf_buf_t target, int sig,
1406 struct proc *p = corelp->lwp_proc;
1410 prfpregset_t fpregs;
1414 prfpregset_t *fpregs;
1419 * Allocate temporary storage for notes on heap to avoid stack overflow.
1421 if (mode != DRYRUN) {
1422 tmpdata = kmalloc(sizeof(*tmpdata), M_TEMP, M_ZERO | M_WAITOK);
1423 status = &tmpdata->status;
1424 fpregs = &tmpdata->fpregs;
1425 psinfo = &tmpdata->psinfo;
1434 * Append LWP-agnostic note.
1436 if (mode != DRYRUN) {
1437 psinfo->pr_version = PRPSINFO_VERSION;
1438 psinfo->pr_psinfosz = sizeof(prpsinfo_t);
1439 strlcpy(psinfo->pr_fname, p->p_comm,
1440 sizeof(psinfo->pr_fname));
1442 * XXX - We don't fill in the command line arguments
1445 strlcpy(psinfo->pr_psargs, p->p_comm,
1446 sizeof(psinfo->pr_psargs));
1449 __elfN(putnote)(target, "CORE", NT_PRPSINFO, psinfo, sizeof *psinfo);
1454 * Append first note for LWP that triggered core so that it is
1455 * the selected one when the debugger starts.
1457 if (mode != DRYRUN) {
1458 status->pr_version = PRSTATUS_VERSION;
1459 status->pr_statussz = sizeof(prstatus_t);
1460 status->pr_gregsetsz = sizeof(gregset_t);
1461 status->pr_fpregsetsz = sizeof(fpregset_t);
1462 status->pr_osreldate = osreldate;
1463 status->pr_cursig = sig;
1465 * XXX GDB needs unique pr_pid for each LWP and does not
1466 * not support pr_pid==0 but lwp_tid can be 0, so hack unique
1469 status->pr_pid = corelp->lwp_tid;
1470 fill_regs(corelp, &status->pr_reg);
1471 fill_fpregs(corelp, fpregs);
1474 __elfN(putnote)(target, "CORE", NT_PRSTATUS, status, sizeof *status);
1478 __elfN(putnote)(target, "CORE", NT_FPREGSET, fpregs, sizeof *fpregs);
1483 * Then append notes for other LWPs.
1485 FOREACH_LWP_IN_PROC(lp, p) {
1488 /* skip lwps being created */
1489 if (lp->lwp_thread == NULL)
1491 if (mode != DRYRUN) {
1492 status->pr_pid = lp->lwp_tid;
1493 fill_regs(lp, &status->pr_reg);
1494 fill_fpregs(lp, fpregs);
1496 error = __elfN(putnote)(target, "CORE", NT_PRSTATUS,
1497 status, sizeof *status);
1500 error = __elfN(putnote)(target, "CORE", NT_FPREGSET,
1501 fpregs, sizeof *fpregs);
1507 if (tmpdata != NULL)
1508 kfree(tmpdata, M_TEMP);
1513 * Generate a note sub-structure.
1515 * NOTE: 4-byte alignment.
1518 __elfN(putnote)(elf_buf_t target, const char *name, int type,
1519 const void *desc, size_t descsz)
1525 note.n_namesz = strlen(name) + 1;
1526 note.n_descsz = descsz;
1528 dst = target_reserve(target, sizeof(note), &error);
1530 bcopy(¬e, dst, sizeof note);
1531 dst = target_reserve(target, note.n_namesz, &error);
1533 bcopy(name, dst, note.n_namesz);
1534 target->off = roundup2(target->off, sizeof(Elf_Word));
1535 dst = target_reserve(target, note.n_descsz, &error);
1537 bcopy(desc, dst, note.n_descsz);
1538 target->off = roundup2(target->off, sizeof(Elf_Word));
1544 elf_putsigs(struct lwp *lp, elf_buf_t target)
1546 /* XXX lwp handle more than one lwp */
1547 struct proc *p = lp->lwp_proc;
1549 struct ckpt_siginfo *csi;
1551 csi = target_reserve(target, sizeof(struct ckpt_siginfo), &error);
1553 csi->csi_ckptpisz = sizeof(struct ckpt_siginfo);
1554 bcopy(p->p_sigacts, &csi->csi_sigacts, sizeof(*p->p_sigacts));
1555 bcopy(&p->p_realtimer, &csi->csi_itimerval, sizeof(struct itimerval));
1556 bcopy(&lp->lwp_sigmask, &csi->csi_sigmask,
1558 csi->csi_sigparent = p->p_sigparent;
1564 elf_putfiles(struct proc *p, elf_buf_t target, struct file *ckfp)
1568 struct ckpt_filehdr *cfh = NULL;
1569 struct ckpt_fileinfo *cfi;
1573 * the duplicated loop is gross, but it was the only way
1574 * to eliminate uninitialized variable warnings
1576 cfh = target_reserve(target, sizeof(struct ckpt_filehdr), &error);
1578 cfh->cfh_nfiles = 0;
1582 * ignore STDIN/STDERR/STDOUT.
1584 for (i = 3; error == 0 && i < p->p_fd->fd_nfiles; i++) {
1585 fp = holdfp(p->p_fd, i, -1);
1589 * XXX Only checkpoint vnodes for now.
1591 if (fp->f_type != DTYPE_VNODE) {
1595 cfi = target_reserve(target, sizeof(struct ckpt_fileinfo),
1601 cfi->cfi_index = -1;
1602 cfi->cfi_type = fp->f_type;
1603 cfi->cfi_flags = fp->f_flag;
1604 cfi->cfi_offset = fp->f_offset;
1605 cfi->cfi_ckflags = 0;
1608 cfi->cfi_ckflags |= CKFIF_ISCKPTFD;
1609 /* f_count and f_msgcount should not be saved/restored */
1610 /* XXX save cred info */
1612 switch(fp->f_type) {
1614 vp = (struct vnode *)fp->f_data;
1616 * it looks like a bug in ptrace is marking
1617 * a non-vnode as a vnode - until we find the
1618 * root cause this will at least prevent
1619 * further panics from truss
1621 if (vp == NULL || vp->v_mount == NULL)
1625 cfi->cfi_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
1626 error = VFS_VPTOFH(vp, &cfi->cfi_fh.fh_fid);
1637 elf_puttextvp(struct proc *p, elf_buf_t target)
1641 struct fp_closure fpc;
1642 struct ckpt_vminfo *vminfo;
1644 vminfo = target_reserve(target, sizeof(struct ckpt_vminfo), &error);
1645 if (vminfo != NULL) {
1646 vminfo->cvm_dsize = p->p_vmspace->vm_dsize;
1647 vminfo->cvm_tsize = p->p_vmspace->vm_tsize;
1648 vminfo->cvm_daddr = p->p_vmspace->vm_daddr;
1649 vminfo->cvm_taddr = p->p_vmspace->vm_taddr;
1653 vn_count = target_reserve(target, sizeof(int), &error);
1654 if (target->buf != NULL) {
1655 fpc.vnh = (struct vn_hdr *)(target->buf + target->off);
1656 fpc.vnh_max = fpc.vnh +
1657 (target->off_max - target->off) / sizeof(struct vn_hdr);
1658 error = each_segment(p, cb_put_fp, &fpc, 0);
1660 *vn_count = fpc.count;
1662 error = each_segment(p, cb_fpcount_segment, &fpc.count, 0);
1664 target->off += fpc.count * sizeof(struct vn_hdr);
1669 * Try to find the appropriate ABI-note section for checknote,
1670 * The entire image is searched if necessary, not only the first page.
1673 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote,
1676 boolean_t valid_note_found;
1677 const Elf_Phdr *phdr, *pnote;
1678 const Elf_Ehdr *hdr;
1681 valid_note_found = FALSE;
1682 hdr = (const Elf_Ehdr *)imgp->image_header;
1683 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
1685 for (i = 0; i < hdr->e_phnum; i++) {
1686 if (phdr[i].p_type == PT_NOTE) {
1688 valid_note_found = check_PT_NOTE (imgp, checknote,
1690 if (valid_note_found)
1694 return valid_note_found;
1698 * Be careful not to create new overflow conditions when checking
1702 note_overflow(const Elf_Note *note, size_t maxsize)
1704 if (sizeof(*note) > maxsize)
1706 if (note->n_namesz > maxsize - sizeof(*note))
1712 hdr_overflow(__ElfN(Off) off_beg, __ElfN(Size) size)
1714 __ElfN(Off) off_end;
1716 off_end = off_beg + size;
1717 if (off_end < off_beg)
1723 check_PT_NOTE(struct image_params *imgp, Elf_Brandnote *checknote,
1724 int32_t *osrel, const Elf_Phdr * pnote)
1726 boolean_t limited_to_first_page;
1727 boolean_t found = FALSE;
1728 const Elf_Note *note, *note0, *note_end;
1729 const char *note_name;
1730 __ElfN(Off) noteloc, firstloc;
1731 __ElfN(Size) notesz, firstlen, endbyte;
1733 struct lwbuf lwb_cache;
1738 if (hdr_overflow(pnote->p_offset, pnote->p_filesz))
1740 notesz = pnote->p_filesz;
1741 noteloc = pnote->p_offset;
1742 endbyte = noteloc + notesz;
1743 limited_to_first_page = noteloc < PAGE_SIZE && endbyte < PAGE_SIZE;
1745 if (limited_to_first_page) {
1746 note = (const Elf_Note *)(imgp->image_header + noteloc);
1747 note_end = (const Elf_Note *)(imgp->image_header + endbyte);
1750 firstloc = noteloc & PAGE_MASK;
1751 firstlen = PAGE_SIZE - firstloc;
1752 if (notesz < sizeof(Elf_Note) || notesz > PAGE_SIZE)
1756 if (exec_map_page(imgp, noteloc >> PAGE_SHIFT, &lwb, &page))
1758 if (firstlen < notesz) { /* crosses page boundary */
1759 data = kmalloc(notesz, M_TEMP, M_WAITOK);
1760 bcopy(page + firstloc, data, firstlen);
1762 exec_unmap_page(lwb);
1764 if (exec_map_page(imgp, (noteloc >> PAGE_SHIFT) + 1,
1766 kfree(data, M_TEMP);
1769 bcopy(page, data + firstlen, notesz - firstlen);
1770 note = note0 = (const Elf_Note *)(data);
1771 note_end = (const Elf_Note *)(data + notesz);
1773 note = note0 = (const Elf_Note *)(page + firstloc);
1774 note_end = (const Elf_Note *)(page + firstloc +
1779 for (n = 0; n < 100 && note >= note0 && note < note_end; n++) {
1780 if (!aligned(note, Elf32_Addr))
1782 if (note_overflow(note, (const char *)note_end -
1783 (const char *)note)) {
1786 note_name = (const char *)(note + 1);
1788 if (note->n_namesz == checknote->hdr.n_namesz
1789 && note->n_descsz == checknote->hdr.n_descsz
1790 && note->n_type == checknote->hdr.n_type
1791 && (strncmp(checknote->vendor, note_name,
1792 checknote->hdr.n_namesz) == 0)) {
1793 /* Fetch osreldata from ABI.note-tag */
1794 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 &&
1795 checknote->trans_osrel != NULL)
1796 checknote->trans_osrel(note, osrel);
1800 note = (const Elf_Note *)((const char *)(note + 1) +
1801 roundup2(note->n_namesz, sizeof(Elf32_Addr)) +
1802 roundup2(note->n_descsz, sizeof(Elf32_Addr)));
1805 if (!limited_to_first_page) {
1807 kfree(data, M_TEMP);
1808 exec_unmap_page(lwb);
1814 * The interpreter program header may be located beyond the first page, so
1815 * regardless of its location, a copy of the interpreter path is created so
1816 * that it may be safely referenced by the calling function in all case. The
1817 * memory is allocated by calling function, and the copying is done here.
1820 extract_interpreter(struct image_params *imgp, const Elf_Phdr *pinterpreter,
1823 boolean_t limited_to_first_page;
1824 const boolean_t result_success = FALSE;
1825 const boolean_t result_failure = TRUE;
1826 __ElfN(Off) pathloc, firstloc;
1827 __ElfN(Size) pathsz, firstlen, endbyte;
1829 struct lwbuf lwb_cache;
1832 if (hdr_overflow(pinterpreter->p_offset, pinterpreter->p_filesz))
1833 return (result_failure);
1834 pathsz = pinterpreter->p_filesz;
1835 pathloc = pinterpreter->p_offset;
1836 endbyte = pathloc + pathsz;
1838 limited_to_first_page = pathloc < PAGE_SIZE && endbyte < PAGE_SIZE;
1839 if (limited_to_first_page) {
1840 bcopy(imgp->image_header + pathloc, data, pathsz);
1841 return (result_success);
1844 firstloc = pathloc & PAGE_MASK;
1845 firstlen = PAGE_SIZE - firstloc;
1848 if (exec_map_page(imgp, pathloc >> PAGE_SHIFT, &lwb, &page))
1849 return (result_failure);
1851 if (firstlen < pathsz) { /* crosses page boundary */
1852 bcopy(page + firstloc, data, firstlen);
1854 exec_unmap_page(lwb);
1856 if (exec_map_page(imgp, (pathloc >> PAGE_SHIFT) + 1, &lwb,
1858 return (result_failure);
1859 bcopy(page, data + firstlen, pathsz - firstlen);
1861 bcopy(page + firstloc, data, pathsz);
1863 exec_unmap_page(lwb);
1864 return (result_success);
1868 __elfN(bsd_trans_osrel)(const Elf_Note *note, int32_t *osrel)
1872 p = (uintptr_t)(note + 1);
1873 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
1874 *osrel = *(const int32_t *)(p);
1880 * Tell kern_execve.c about it, with a little help from the linker.
1882 #if defined(__x86_64__)
1883 static struct execsw elf_execsw = {exec_elf64_imgact, "ELF64"};
1884 EXEC_SET_ORDERED(elf64, elf_execsw, SI_ORDER_FIRST);
1885 #else /* i386 assumed */
1886 static struct execsw elf_execsw = {exec_elf32_imgact, "ELF32"};
1887 EXEC_SET_ORDERED(elf32, elf_execsw, SI_ORDER_FIRST);
1891 __elfN(trans_prot)(Elf_Word flags)
1897 prot |= VM_PROT_EXECUTE;
1899 prot |= VM_PROT_WRITE;
1901 prot |= VM_PROT_READ;
1906 __elfN(untrans_prot)(vm_prot_t prot)
1911 if (prot & VM_PROT_EXECUTE)
1913 if (prot & VM_PROT_READ)
1915 if (prot & VM_PROT_WRITE)