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;
251 vm_offset_t file_addr;
253 object = vp->v_object;
256 vm_object_hold(object);
259 * It's necessary to fail if the filsz + offset taken from the
260 * header is greater than the actual file pager object's size.
261 * If we were to allow this, then the vm_map_find() below would
262 * walk right off the end of the file object and into the ether.
264 * While I'm here, might as well check for something else that
265 * is invalid: filsz cannot be greater than memsz.
267 if ((off_t)filsz + offset > vp->v_filesize || filsz > memsz) {
268 uprintf("elf_load_section: truncated ELF file\n");
269 vm_object_drop(object);
273 map_addr = trunc_page((vm_offset_t)vmaddr);
274 file_addr = trunc_page(offset);
277 * We have two choices. We can either clear the data in the last page
278 * of an oversized mapping, or we can start the anon mapping a page
279 * early and copy the initialized data into that first page. We
280 * choose the second..
283 map_len = trunc_page(offset+filsz) - file_addr;
285 map_len = round_page(offset+filsz) - file_addr;
288 vm_object_reference_locked(object);
290 /* cow flags: don't dump readonly sections in core */
291 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
292 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
294 count = vm_map_entry_reserve(MAP_RESERVE_COUNT);
295 vm_map_lock(&vmspace->vm_map);
296 rv = vm_map_insert(&vmspace->vm_map, &count,
298 file_addr, /* file offset */
299 map_addr, /* virtual start */
300 map_addr + map_len,/* virtual end */
304 vm_map_unlock(&vmspace->vm_map);
305 vm_map_entry_release(count);
306 if (rv != KERN_SUCCESS) {
307 vm_object_deallocate(object);
308 vm_object_drop(object);
312 /* we can stop now if we've covered it all */
313 if (memsz == filsz) {
314 vm_object_drop(object);
321 * We have to get the remaining bit of the file into the first part
322 * of the oversized map segment. This is normally because the .data
323 * segment in the file is extended to provide bss. It's a neat idea
324 * to try and save a page, but it's a pain in the behind to implement.
326 copy_len = (offset + filsz) - trunc_page(offset + filsz);
327 map_addr = trunc_page((vm_offset_t)vmaddr + filsz);
328 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr;
330 /* This had damn well better be true! */
332 count = vm_map_entry_reserve(MAP_RESERVE_COUNT);
333 vm_map_lock(&vmspace->vm_map);
334 rv = vm_map_insert(&vmspace->vm_map, &count,
336 map_addr, map_addr + map_len,
338 VM_PROT_ALL, VM_PROT_ALL,
340 vm_map_unlock(&vmspace->vm_map);
341 vm_map_entry_release(count);
342 if (rv != KERN_SUCCESS) {
343 vm_object_drop(object);
351 struct lwbuf lwb_cache;
353 m = vm_fault_object_page(object, trunc_page(offset + filsz),
354 VM_PROT_READ, 0, &error);
356 lwb = lwbuf_alloc(m, &lwb_cache);
357 error = copyout((caddr_t)lwbuf_kva(lwb),
358 (caddr_t)map_addr, copy_len);
363 vm_object_drop(object);
368 vm_object_drop(object);
370 * set it to the specified protection
372 vm_map_protect(&vmspace->vm_map, map_addr, map_addr + map_len,
379 * Load the file "file" into memory. It may be either a shared object
382 * The "addr" reference parameter is in/out. On entry, it specifies
383 * the address where a shared object should be loaded. If the file is
384 * an executable, this value is ignored. On exit, "addr" specifies
385 * where the file was actually loaded.
387 * The "entry" reference parameter is out only. On exit, it specifies
388 * the entry point for the loaded file.
391 __elfN(load_file)(struct proc *p, const char *file, u_long *addr, u_long *entry)
394 struct nlookupdata nd;
396 struct image_params image_params;
398 const Elf_Ehdr *hdr = NULL;
399 const Elf_Phdr *phdr = NULL;
400 struct nlookupdata *nd;
401 struct vmspace *vmspace = p->p_vmspace;
403 struct image_params *imgp;
404 struct mount *topmnt;
407 u_long base_addr = 0;
408 int error, i, numsegs;
410 tempdata = kmalloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
412 attr = &tempdata->attr;
413 imgp = &tempdata->image_params;
416 * Initialize part of the common data
420 imgp->firstpage = NULL;
421 imgp->image_header = NULL;
424 error = nlookup_init(nd, file, UIO_SYSSPACE, NLC_FOLLOW);
428 error = cache_vget(&nd->nl_nch, nd->nl_cred, LK_EXCLUSIVE, &imgp->vp);
429 topmnt = nd->nl_nch.mount;
435 * Check permissions, modes, uid, etc on the file, and "open" it.
437 error = exec_check_permissions(imgp, topmnt);
443 error = exec_map_first_page(imgp);
445 * Also make certain that the interpreter stays the same, so set
446 * its VTEXT flag, too.
449 vsetflags(imgp->vp, VTEXT);
454 hdr = (const Elf_Ehdr *)imgp->image_header;
455 if ((error = __elfN(check_header)(hdr)) != 0)
457 if (hdr->e_type == ET_DYN)
459 else if (hdr->e_type == ET_EXEC)
466 /* Only support headers that fit within first page for now */
467 /* (multiplication of two Elf_Half fields will not overflow) */
468 if ((hdr->e_phoff > PAGE_SIZE) ||
469 (hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE - hdr->e_phoff) {
474 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
475 if (!aligned(phdr, Elf_Addr)) {
480 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
481 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) {
482 /* Loadable segment */
483 prot = __elfN(trans_prot)(phdr[i].p_flags);
484 error = __elfN(load_section)(
485 p, vmspace, imgp->vp,
487 (caddr_t)phdr[i].p_vaddr +
490 phdr[i].p_filesz, prot);
494 * Establish the base address if this is the
498 base_addr = trunc_page(phdr[i].p_vaddr + rbase);
503 *entry = (unsigned long)hdr->e_entry + rbase;
507 exec_unmap_first_page(imgp);
512 kfree(tempdata, M_TEMP);
517 static Elf_Brandinfo *
518 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
521 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
526 /* We support four types of branding -- (1) the ELF EI_OSABI field
527 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
528 * branding within the ELF header, (3) path of the `interp_path' field,
529 * and (4) the ".note.ABI-tag" ELF section.
532 /* Look for an ".note.ABI-tag" ELF section */
533 for (i = 0; i < MAX_BRANDS; i++) {
534 bi = elf_brand_list[i];
538 if (hdr->e_machine == bi->machine && (bi->flags &
539 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
540 ret = __elfN(check_note)(imgp, bi->brand_note, osrel);
546 /* If the executable has a brand, search for it in the brand list. */
547 for (i = 0; i < MAX_BRANDS; i++) {
548 bi = elf_brand_list[i];
550 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
552 if (hdr->e_machine == bi->machine &&
553 (hdr->e_ident[EI_OSABI] == bi->brand ||
554 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
555 bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0))
559 /* Lacking a known brand, search for a recognized interpreter. */
560 if (interp != NULL) {
561 for (i = 0; i < MAX_BRANDS; i++) {
562 bi = elf_brand_list[i];
564 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
566 if (hdr->e_machine == bi->machine &&
567 strcmp(interp, bi->interp_path) == 0)
572 /* Lacking a recognized interpreter, try the default brand */
573 for (i = 0; i < MAX_BRANDS; i++) {
574 bi = elf_brand_list[i];
576 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
578 if (hdr->e_machine == bi->machine &&
579 __elfN(fallback_brand) == bi->brand)
586 __CONCAT(exec_,__elfN(imgact))(struct image_params *imgp)
588 const Elf_Ehdr *hdr = (const Elf_Ehdr *) imgp->image_header;
589 const Elf_Phdr *phdr;
590 Elf_Auxargs *elf_auxargs;
591 struct vmspace *vmspace;
593 u_long text_size = 0, data_size = 0, total_size = 0;
594 u_long text_addr = 0, data_addr = 0;
595 u_long seg_size, seg_addr;
596 u_long addr, baddr, et_dyn_addr, entry = 0, proghdr = 0;
601 const char *newinterp = NULL;
602 Elf_Brandinfo *brand_info;
606 * Do we have a valid ELF header ?
608 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later if a particular
609 * brand doesn't support it. Both DragonFly platforms do by default.
611 if (__elfN(check_header)(hdr) != 0 ||
612 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
616 * From here on down, we return an errno, not -1, as we've
617 * detected an ELF file.
620 if ((hdr->e_phoff > PAGE_SIZE) ||
621 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) {
622 /* Only support headers in first page for now */
625 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
626 if (!aligned(phdr, Elf_Addr))
630 for (i = 0; i < hdr->e_phnum; i++) {
631 if (phdr[i].p_type == PT_LOAD) {
633 baddr = phdr[i].p_vaddr;
637 if (phdr[i].p_type == PT_INTERP) {
639 * If interp is already defined there are more than
640 * one PT_INTERP program headers present. Take only
641 * the first one and ignore the rest.
646 if (phdr[i].p_filesz == 0 ||
647 phdr[i].p_filesz > PAGE_SIZE ||
648 phdr[i].p_filesz > MAXPATHLEN)
651 interp = kmalloc(phdr[i].p_filesz, M_TEMP, M_WAITOK);
652 failure = extract_interpreter(imgp, &phdr[i], interp);
654 kfree(interp, M_TEMP);
661 brand_info = __elfN(get_brandinfo)(imgp, interp, &osrel);
662 if (brand_info == NULL) {
663 uprintf("ELF binary type \"%u\" not known.\n",
664 hdr->e_ident[EI_OSABI]);
666 kfree(interp, M_TEMP);
669 if (hdr->e_type == ET_DYN) {
670 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) {
672 kfree(interp, M_TEMP);
676 * Honour the base load address from the dso if it is
677 * non-zero for some reason.
680 et_dyn_addr = ET_DYN_LOAD_ADDR;
686 if (interp != NULL && brand_info->interp_newpath != NULL)
687 newinterp = brand_info->interp_newpath;
689 exec_new_vmspace(imgp, NULL);
692 * Yeah, I'm paranoid. There is every reason in the world to get
693 * VTEXT now since from here on out, there are places we can have
694 * a context switch. Better safe than sorry; I really don't want
695 * the file to change while it's being loaded.
697 vsetflags(imgp->vp, VTEXT);
699 vmspace = imgp->proc->p_vmspace;
701 for (i = 0; i < hdr->e_phnum; i++) {
702 switch (phdr[i].p_type) {
703 case PT_LOAD: /* Loadable segment */
704 if (phdr[i].p_memsz == 0)
706 prot = __elfN(trans_prot)(phdr[i].p_flags);
708 if ((error = __elfN(load_section)(
713 (caddr_t)phdr[i].p_vaddr + et_dyn_addr,
718 kfree (interp, M_TEMP);
723 * If this segment contains the program headers,
724 * remember their virtual address for the AT_PHDR
725 * aux entry. Static binaries don't usually include
728 if (phdr[i].p_offset == 0 &&
729 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize
731 proghdr = phdr[i].p_vaddr + hdr->e_phoff +
734 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
735 seg_size = round_page(phdr[i].p_memsz +
736 phdr[i].p_vaddr + et_dyn_addr - seg_addr);
739 * Is this .text or .data? We can't use
740 * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the
741 * alpha terribly and possibly does other bad
742 * things so we stick to the old way of figuring
743 * it out: If the segment contains the program
744 * entry point, it's a text segment, otherwise it
747 * Note that obreak() assumes that data_addr +
748 * data_size == end of data load area, and the ELF
749 * file format expects segments to be sorted by
750 * address. If multiple data segments exist, the
751 * last one will be used.
753 if (hdr->e_entry >= phdr[i].p_vaddr &&
754 hdr->e_entry < (phdr[i].p_vaddr +
756 text_size = seg_size;
757 text_addr = seg_addr;
758 entry = (u_long)hdr->e_entry + et_dyn_addr;
760 data_size = seg_size;
761 data_addr = seg_addr;
763 total_size += seg_size;
766 * Check limits. It should be safe to check the
767 * limits after loading the segment since we do
768 * not actually fault in all the segment's pages.
771 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur ||
772 text_size > maxtsiz ||
774 imgp->proc->p_rlimit[RLIMIT_VMEM].rlim_cur) {
776 kfree(interp, M_TEMP);
781 case PT_PHDR: /* Program header table info */
782 proghdr = phdr[i].p_vaddr + et_dyn_addr;
789 vmspace->vm_tsize = text_size >> PAGE_SHIFT;
790 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
791 vmspace->vm_dsize = data_size >> PAGE_SHIFT;
792 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
794 addr = ELF_RTLD_ADDR(vmspace);
796 imgp->entry_addr = entry;
798 imgp->proc->p_sysent = brand_info->sysvec;
799 EVENTHANDLER_INVOKE(process_exec, imgp);
801 if (interp != NULL) {
802 int have_interp = FALSE;
803 if (brand_info->emul_path != NULL &&
804 brand_info->emul_path[0] != '\0') {
805 path = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK);
806 ksnprintf(path, MAXPATHLEN, "%s%s",
807 brand_info->emul_path, interp);
808 error = __elfN(load_file)(imgp->proc, path, &addr,
814 if (!have_interp && newinterp != NULL) {
815 error = __elfN(load_file)(imgp->proc, newinterp,
816 &addr, &imgp->entry_addr);
821 error = __elfN(load_file)(imgp->proc, interp, &addr,
825 uprintf("ELF interpreter %s not found\n", interp);
826 kfree(interp, M_TEMP);
829 kfree(interp, M_TEMP);
834 * Construct auxargs table (used by the fixup routine)
836 elf_auxargs = kmalloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
837 elf_auxargs->execfd = -1;
838 elf_auxargs->phdr = proghdr;
839 elf_auxargs->phent = hdr->e_phentsize;
840 elf_auxargs->phnum = hdr->e_phnum;
841 elf_auxargs->pagesz = PAGE_SIZE;
842 elf_auxargs->base = addr;
843 elf_auxargs->flags = 0;
844 elf_auxargs->entry = entry;
846 imgp->auxargs = elf_auxargs;
847 imgp->interpreted = 0;
848 imgp->proc->p_osrel = osrel;
854 __elfN(dragonfly_fixup)(register_t **stack_base, struct image_params *imgp)
856 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
860 base = (Elf_Addr *)*stack_base;
861 pos = base + (imgp->args->argc + imgp->args->envc + 2);
863 if (args->execfd != -1)
864 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
865 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
866 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
867 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
868 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
869 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
870 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
871 AUXARGS_ENTRY(pos, AT_BASE, args->base);
872 if (imgp->execpathp != 0)
873 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp);
874 AUXARGS_ENTRY(pos, AT_OSRELDATE, osreldate);
875 AUXARGS_ENTRY(pos, AT_NULL, 0);
877 kfree(imgp->auxargs, M_TEMP);
878 imgp->auxargs = NULL;
881 suword(base, (long)imgp->args->argc);
882 *stack_base = (register_t *)base;
887 * Code for generating ELF core dumps.
890 typedef int (*segment_callback)(vm_map_entry_t, void *);
892 /* Closure for cb_put_phdr(). */
893 struct phdr_closure {
894 Elf_Phdr *phdr; /* Program header to fill in (incremented) */
895 Elf_Phdr *phdr_max; /* Pointer bound for error check */
896 Elf_Off offset; /* Offset of segment in core file */
899 /* Closure for cb_size_segment(). */
900 struct sseg_closure {
901 int count; /* Count of writable segments. */
902 size_t vsize; /* Total size of all writable segments. */
905 /* Closure for cb_put_fp(). */
908 struct vn_hdr *vnh_max;
913 typedef struct elf_buf {
919 static void *target_reserve(elf_buf_t target, size_t bytes, int *error);
921 static int cb_put_phdr (vm_map_entry_t, void *);
922 static int cb_size_segment (vm_map_entry_t, void *);
923 static int cb_fpcount_segment(vm_map_entry_t, void *);
924 static int cb_put_fp(vm_map_entry_t, void *);
927 static int each_segment (struct proc *, segment_callback, void *, int);
928 static int __elfN(corehdr)(struct lwp *, int, struct file *, struct ucred *,
930 enum putmode { WRITE, DRYRUN };
931 static int __elfN(puthdr)(struct lwp *, elf_buf_t, int sig, enum putmode,
933 static int elf_putallnotes(struct lwp *, elf_buf_t, int, enum putmode);
934 static int __elfN(putnote)(elf_buf_t, const char *, int, const void *, size_t);
936 static int elf_putsigs(struct lwp *, elf_buf_t);
937 static int elf_puttextvp(struct proc *, elf_buf_t);
938 static int elf_putfiles(struct proc *, elf_buf_t, struct file *);
941 __elfN(coredump)(struct lwp *lp, int sig, struct vnode *vp, off_t limit)
946 if ((error = falloc(NULL, &fp, NULL)) != 0)
948 fsetcred(fp, lp->lwp_proc->p_ucred);
953 fp->f_type = DTYPE_VNODE;
954 fp->f_flag = O_CREAT|O_WRONLY|O_NOFOLLOW;
955 fp->f_ops = &vnode_fileops;
958 error = generic_elf_coredump(lp, sig, fp, limit);
962 fp->f_ops = &badfileops;
969 generic_elf_coredump(struct lwp *lp, int sig, struct file *fp, off_t limit)
971 struct proc *p = lp->lwp_proc;
972 struct ucred *cred = p->p_ucred;
974 struct sseg_closure seginfo;
975 struct elf_buf target;
978 kprintf("can't dump core - null fp\n");
981 * Size the program segments
985 each_segment(p, cb_size_segment, &seginfo, 1);
988 * Calculate the size of the core file header area by making
989 * a dry run of generating it. Nothing is written, but the
990 * size is calculated.
992 bzero(&target, sizeof(target));
993 __elfN(puthdr)(lp, &target, sig, DRYRUN, seginfo.count, fp);
995 if (target.off + seginfo.vsize >= limit)
999 * Allocate memory for building the header, fill it up,
1002 target.off_max = target.off;
1004 target.buf = kmalloc(target.off_max, M_TEMP, M_WAITOK|M_ZERO);
1006 error = __elfN(corehdr)(lp, sig, fp, cred, seginfo.count, &target);
1008 /* Write the contents of all of the writable segments. */
1014 php = (Elf_Phdr *)(target.buf + sizeof(Elf_Ehdr)) + 1;
1015 for (i = 0; i < seginfo.count; i++) {
1016 error = fp_write(fp, (caddr_t)php->p_vaddr,
1017 php->p_filesz, &nbytes, UIO_USERSPACE);
1023 kfree(target.buf, M_TEMP);
1029 * A callback for each_segment() to write out the segment's
1030 * program header entry.
1033 cb_put_phdr(vm_map_entry_t entry, void *closure)
1035 struct phdr_closure *phc = closure;
1036 Elf_Phdr *phdr = phc->phdr;
1038 if (phc->phdr == phc->phdr_max)
1041 phc->offset = round_page(phc->offset);
1043 phdr->p_type = PT_LOAD;
1044 phdr->p_offset = phc->offset;
1045 phdr->p_vaddr = entry->start;
1047 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1048 phdr->p_align = PAGE_SIZE;
1049 phdr->p_flags = __elfN(untrans_prot)(entry->protection);
1051 phc->offset += phdr->p_filesz;
1057 * A callback for each_writable_segment() to gather information about
1058 * the number of segments and their total size.
1061 cb_size_segment(vm_map_entry_t entry, void *closure)
1063 struct sseg_closure *ssc = closure;
1066 ssc->vsize += entry->end - entry->start;
1071 * A callback for each_segment() to gather information about
1072 * the number of text segments.
1075 cb_fpcount_segment(vm_map_entry_t entry, void *closure)
1077 int *count = closure;
1080 if (entry->object.vm_object->type == OBJT_VNODE) {
1081 vp = (struct vnode *)entry->object.vm_object->handle;
1082 if ((vp->v_flag & VCKPT) && curproc->p_textvp == vp)
1090 cb_put_fp(vm_map_entry_t entry, void *closure)
1092 struct fp_closure *fpc = closure;
1093 struct vn_hdr *vnh = fpc->vnh;
1094 Elf_Phdr *phdr = &vnh->vnh_phdr;
1099 * If an entry represents a vnode then write out a file handle.
1101 * If we are checkpointing a checkpoint-restored program we do
1102 * NOT record the filehandle for the old checkpoint vnode (which
1103 * is mapped all over the place). Instead we rely on the fact
1104 * that a checkpoint-restored program does not mmap() the checkpt
1105 * vnode NOCORE, so its contents will be written out to the
1106 * new checkpoint file. This is necessary because the 'old'
1107 * checkpoint file is typically destroyed when a new one is created
1108 * and thus cannot be used to restore the new checkpoint.
1110 * Theoretically we could create a chain of checkpoint files and
1111 * operate the checkpointing operation kinda like an incremental
1112 * checkpoint, but a checkpoint restore would then likely wind up
1113 * referencing many prior checkpoint files and that is a bit over
1114 * the top for the purpose of the checkpoint API.
1116 if (entry->object.vm_object->type == OBJT_VNODE) {
1117 vp = (struct vnode *)entry->object.vm_object->handle;
1118 if ((vp->v_flag & VCKPT) && curproc->p_textvp == vp)
1120 if (vnh == fpc->vnh_max)
1124 vnh->vnh_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
1125 error = VFS_VPTOFH(vp, &vnh->vnh_fh.fh_fid);
1127 char *freepath, *fullpath;
1129 if (vn_fullpath(curproc, vp, &fullpath, &freepath, 0)) {
1130 kprintf("Warning: coredump, error %d: cannot store file handle for vnode %p\n", error, vp);
1132 kprintf("Warning: coredump, error %d: cannot store file handle for %s\n", error, fullpath);
1133 kfree(freepath, M_TEMP);
1138 phdr->p_type = PT_LOAD;
1139 phdr->p_offset = 0; /* not written to core */
1140 phdr->p_vaddr = entry->start;
1142 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1143 phdr->p_align = PAGE_SIZE;
1145 if (entry->protection & VM_PROT_READ)
1146 phdr->p_flags |= PF_R;
1147 if (entry->protection & VM_PROT_WRITE)
1148 phdr->p_flags |= PF_W;
1149 if (entry->protection & VM_PROT_EXECUTE)
1150 phdr->p_flags |= PF_X;
1158 * For each writable segment in the process's memory map, call the given
1159 * function with a pointer to the map entry and some arbitrary
1160 * caller-supplied data.
1163 each_segment(struct proc *p, segment_callback func, void *closure, int writable)
1166 vm_map_t map = &p->p_vmspace->vm_map;
1167 vm_map_entry_t entry;
1169 for (entry = map->header.next; error == 0 && entry != &map->header;
1170 entry = entry->next) {
1176 * Don't dump inaccessible mappings, deal with legacy
1179 * Note that read-only segments related to the elf binary
1180 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1181 * need to arbitrarily ignore such segments.
1183 if (elf_legacy_coredump) {
1184 if (writable && (entry->protection & VM_PROT_RW) != VM_PROT_RW)
1187 if (writable && (entry->protection & VM_PROT_ALL) == 0)
1192 * Dont include memory segment in the coredump if
1193 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1196 * Currently we only dump normal VM object maps. We do
1197 * not dump submaps or virtual page tables.
1199 if (writable && (entry->eflags & MAP_ENTRY_NOCOREDUMP))
1201 if (entry->maptype != VM_MAPTYPE_NORMAL)
1203 if ((obj = entry->object.vm_object) == NULL)
1207 * Find the bottom-most object, leaving the base object
1208 * and the bottom-most object held (but only one hold
1209 * if they happen to be the same).
1211 vm_object_hold(obj);
1214 while (lobj && (tobj = lobj->backing_object) != NULL) {
1215 KKASSERT(tobj != obj);
1216 vm_object_hold(tobj);
1217 if (tobj == lobj->backing_object) {
1219 vm_object_lock_swap();
1220 vm_object_drop(lobj);
1224 vm_object_drop(tobj);
1229 * The callback only applies to default, swap, or vnode
1230 * objects. Other types of objects such as memory-mapped
1231 * devices are ignored.
1233 if (lobj->type == OBJT_DEFAULT || lobj->type == OBJT_SWAP ||
1234 lobj->type == OBJT_VNODE) {
1235 error = (*func)(entry, closure);
1238 vm_object_drop(lobj);
1239 vm_object_drop(obj);
1246 target_reserve(elf_buf_t target, size_t bytes, int *error)
1251 if (target->off + bytes > target->off_max)
1254 res = target->buf + target->off;
1256 target->off += bytes;
1261 * Write the core file header to the file, including padding up to
1262 * the page boundary.
1265 __elfN(corehdr)(struct lwp *lp, int sig, struct file *fp, struct ucred *cred,
1266 int numsegs, elf_buf_t target)
1272 * Fill in the header. The fp is passed so we can detect and flag
1273 * a checkpoint file pointer within the core file itself, because
1274 * it may not be restored from the same file handle.
1276 error = __elfN(puthdr)(lp, target, sig, WRITE, numsegs, fp);
1278 /* Write it to the core file. */
1280 error = fp_write(fp, target->buf, target->off, &nbytes,
1287 __elfN(puthdr)(struct lwp *lp, elf_buf_t target, int sig, enum putmode mode,
1288 int numsegs, struct file *fp)
1290 struct proc *p = lp->lwp_proc;
1298 ehdr = target_reserve(target, sizeof(Elf_Ehdr), &error);
1300 phoff = target->off;
1301 phdr = target_reserve(target, (numsegs + 1) * sizeof(Elf_Phdr), &error);
1303 noteoff = target->off;
1305 elf_putallnotes(lp, target, sig, mode);
1306 notesz = target->off - noteoff;
1309 * put extra cruft for dumping process state here
1310 * - we really want it be before all the program
1312 * - we just need to update the offset accordingly
1313 * and GDB will be none the wiser.
1316 error = elf_puttextvp(p, target);
1318 error = elf_putsigs(lp, target);
1320 error = elf_putfiles(p, target, fp);
1323 * Align up to a page boundary for the program segments. The
1324 * actual data will be written to the outptu file, not to elf_buf_t,
1325 * so we do not have to do any further bounds checking.
1327 target->off = round_page(target->off);
1328 if (error == 0 && ehdr != NULL) {
1330 * Fill in the ELF header.
1332 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1333 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1334 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1335 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1336 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1337 ehdr->e_ident[EI_DATA] = ELF_DATA;
1338 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1339 ehdr->e_ident[EI_OSABI] = ELFOSABI_NONE;
1340 ehdr->e_ident[EI_ABIVERSION] = 0;
1341 ehdr->e_ident[EI_PAD] = 0;
1342 ehdr->e_type = ET_CORE;
1343 ehdr->e_machine = ELF_ARCH;
1344 ehdr->e_version = EV_CURRENT;
1346 ehdr->e_phoff = phoff;
1348 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1349 ehdr->e_phentsize = sizeof(Elf_Phdr);
1350 ehdr->e_phnum = numsegs + 1;
1351 ehdr->e_shentsize = sizeof(Elf_Shdr);
1353 ehdr->e_shstrndx = SHN_UNDEF;
1355 if (error == 0 && phdr != NULL) {
1357 * Fill in the program header entries.
1359 struct phdr_closure phc;
1361 /* The note segement. */
1362 phdr->p_type = PT_NOTE;
1363 phdr->p_offset = noteoff;
1366 phdr->p_filesz = notesz;
1372 /* All the writable segments from the program. */
1374 phc.phdr_max = phdr + numsegs;
1375 phc.offset = target->off;
1376 each_segment(p, cb_put_phdr, &phc, 1);
1382 * Append core dump notes to target ELF buffer or simply update target size
1383 * if dryrun selected.
1386 elf_putallnotes(struct lwp *corelp, elf_buf_t target, int sig,
1389 struct proc *p = corelp->lwp_proc;
1393 prfpregset_t fpregs;
1397 prfpregset_t *fpregs;
1402 * Allocate temporary storage for notes on heap to avoid stack overflow.
1404 if (mode != DRYRUN) {
1405 tmpdata = kmalloc(sizeof(*tmpdata), M_TEMP, M_ZERO | M_WAITOK);
1406 status = &tmpdata->status;
1407 fpregs = &tmpdata->fpregs;
1408 psinfo = &tmpdata->psinfo;
1417 * Append LWP-agnostic note.
1419 if (mode != DRYRUN) {
1420 psinfo->pr_version = PRPSINFO_VERSION;
1421 psinfo->pr_psinfosz = sizeof(prpsinfo_t);
1422 strlcpy(psinfo->pr_fname, p->p_comm,
1423 sizeof(psinfo->pr_fname));
1425 * XXX - We don't fill in the command line arguments
1428 strlcpy(psinfo->pr_psargs, p->p_comm,
1429 sizeof(psinfo->pr_psargs));
1432 __elfN(putnote)(target, "CORE", NT_PRPSINFO, psinfo, sizeof *psinfo);
1437 * Append first note for LWP that triggered core so that it is
1438 * the selected one when the debugger starts.
1440 if (mode != DRYRUN) {
1441 status->pr_version = PRSTATUS_VERSION;
1442 status->pr_statussz = sizeof(prstatus_t);
1443 status->pr_gregsetsz = sizeof(gregset_t);
1444 status->pr_fpregsetsz = sizeof(fpregset_t);
1445 status->pr_osreldate = osreldate;
1446 status->pr_cursig = sig;
1448 * XXX GDB needs unique pr_pid for each LWP and does not
1449 * not support pr_pid==0 but lwp_tid can be 0, so hack unique
1452 status->pr_pid = corelp->lwp_tid;
1453 fill_regs(corelp, &status->pr_reg);
1454 fill_fpregs(corelp, fpregs);
1457 __elfN(putnote)(target, "CORE", NT_PRSTATUS, status, sizeof *status);
1461 __elfN(putnote)(target, "CORE", NT_FPREGSET, fpregs, sizeof *fpregs);
1466 * Then append notes for other LWPs.
1468 FOREACH_LWP_IN_PROC(lp, p) {
1471 /* skip lwps being created */
1472 if (lp->lwp_thread == NULL)
1474 if (mode != DRYRUN) {
1475 status->pr_pid = lp->lwp_tid;
1476 fill_regs(lp, &status->pr_reg);
1477 fill_fpregs(lp, fpregs);
1479 error = __elfN(putnote)(target, "CORE", NT_PRSTATUS,
1480 status, sizeof *status);
1483 error = __elfN(putnote)(target, "CORE", NT_FPREGSET,
1484 fpregs, sizeof *fpregs);
1490 if (tmpdata != NULL)
1491 kfree(tmpdata, M_TEMP);
1496 * Generate a note sub-structure.
1498 * NOTE: 4-byte alignment.
1501 __elfN(putnote)(elf_buf_t target, const char *name, int type,
1502 const void *desc, size_t descsz)
1508 note.n_namesz = strlen(name) + 1;
1509 note.n_descsz = descsz;
1511 dst = target_reserve(target, sizeof(note), &error);
1513 bcopy(¬e, dst, sizeof note);
1514 dst = target_reserve(target, note.n_namesz, &error);
1516 bcopy(name, dst, note.n_namesz);
1517 target->off = roundup2(target->off, sizeof(Elf_Word));
1518 dst = target_reserve(target, note.n_descsz, &error);
1520 bcopy(desc, dst, note.n_descsz);
1521 target->off = roundup2(target->off, sizeof(Elf_Word));
1527 elf_putsigs(struct lwp *lp, elf_buf_t target)
1529 /* XXX lwp handle more than one lwp */
1530 struct proc *p = lp->lwp_proc;
1532 struct ckpt_siginfo *csi;
1534 csi = target_reserve(target, sizeof(struct ckpt_siginfo), &error);
1536 csi->csi_ckptpisz = sizeof(struct ckpt_siginfo);
1537 bcopy(p->p_sigacts, &csi->csi_sigacts, sizeof(*p->p_sigacts));
1538 bcopy(&p->p_realtimer, &csi->csi_itimerval, sizeof(struct itimerval));
1539 bcopy(&lp->lwp_sigmask, &csi->csi_sigmask,
1541 csi->csi_sigparent = p->p_sigparent;
1547 elf_putfiles(struct proc *p, elf_buf_t target, struct file *ckfp)
1551 struct ckpt_filehdr *cfh = NULL;
1552 struct ckpt_fileinfo *cfi;
1556 * the duplicated loop is gross, but it was the only way
1557 * to eliminate uninitialized variable warnings
1559 cfh = target_reserve(target, sizeof(struct ckpt_filehdr), &error);
1561 cfh->cfh_nfiles = 0;
1565 * ignore STDIN/STDERR/STDOUT.
1567 for (i = 3; error == 0 && i < p->p_fd->fd_nfiles; i++) {
1568 fp = holdfp(p->p_fd, i, -1);
1572 * XXX Only checkpoint vnodes for now.
1574 if (fp->f_type != DTYPE_VNODE) {
1578 cfi = target_reserve(target, sizeof(struct ckpt_fileinfo),
1584 cfi->cfi_index = -1;
1585 cfi->cfi_type = fp->f_type;
1586 cfi->cfi_flags = fp->f_flag;
1587 cfi->cfi_offset = fp->f_offset;
1588 cfi->cfi_ckflags = 0;
1591 cfi->cfi_ckflags |= CKFIF_ISCKPTFD;
1592 /* f_count and f_msgcount should not be saved/restored */
1593 /* XXX save cred info */
1595 switch(fp->f_type) {
1597 vp = (struct vnode *)fp->f_data;
1599 * it looks like a bug in ptrace is marking
1600 * a non-vnode as a vnode - until we find the
1601 * root cause this will at least prevent
1602 * further panics from truss
1604 if (vp == NULL || vp->v_mount == NULL)
1608 cfi->cfi_fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
1609 error = VFS_VPTOFH(vp, &cfi->cfi_fh.fh_fid);
1620 elf_puttextvp(struct proc *p, elf_buf_t target)
1624 struct fp_closure fpc;
1625 struct ckpt_vminfo *vminfo;
1627 vminfo = target_reserve(target, sizeof(struct ckpt_vminfo), &error);
1628 if (vminfo != NULL) {
1629 vminfo->cvm_dsize = p->p_vmspace->vm_dsize;
1630 vminfo->cvm_tsize = p->p_vmspace->vm_tsize;
1631 vminfo->cvm_daddr = p->p_vmspace->vm_daddr;
1632 vminfo->cvm_taddr = p->p_vmspace->vm_taddr;
1636 vn_count = target_reserve(target, sizeof(int), &error);
1637 if (target->buf != NULL) {
1638 fpc.vnh = (struct vn_hdr *)(target->buf + target->off);
1639 fpc.vnh_max = fpc.vnh +
1640 (target->off_max - target->off) / sizeof(struct vn_hdr);
1641 error = each_segment(p, cb_put_fp, &fpc, 0);
1643 *vn_count = fpc.count;
1645 error = each_segment(p, cb_fpcount_segment, &fpc.count, 0);
1647 target->off += fpc.count * sizeof(struct vn_hdr);
1652 * Try to find the appropriate ABI-note section for checknote,
1653 * The entire image is searched if necessary, not only the first page.
1656 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote,
1659 boolean_t valid_note_found;
1660 const Elf_Phdr *phdr, *pnote;
1661 const Elf_Ehdr *hdr;
1664 valid_note_found = FALSE;
1665 hdr = (const Elf_Ehdr *)imgp->image_header;
1666 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
1668 for (i = 0; i < hdr->e_phnum; i++) {
1669 if (phdr[i].p_type == PT_NOTE) {
1671 valid_note_found = check_PT_NOTE (imgp, checknote,
1673 if (valid_note_found)
1677 return valid_note_found;
1681 * Be careful not to create new overflow conditions when checking
1685 note_overflow(const Elf_Note *note, size_t maxsize)
1687 if (sizeof(*note) > maxsize)
1689 if (note->n_namesz > maxsize - sizeof(*note))
1695 hdr_overflow(__ElfN(Off) off_beg, __ElfN(Size) size)
1697 __ElfN(Off) off_end;
1699 off_end = off_beg + size;
1700 if (off_end < off_beg)
1706 check_PT_NOTE(struct image_params *imgp, Elf_Brandnote *checknote,
1707 int32_t *osrel, const Elf_Phdr * pnote)
1709 boolean_t limited_to_first_page;
1710 boolean_t found = FALSE;
1711 const Elf_Note *note, *note0, *note_end;
1712 const char *note_name;
1713 __ElfN(Off) noteloc, firstloc;
1714 __ElfN(Size) notesz, firstlen, endbyte;
1716 struct lwbuf lwb_cache;
1721 if (hdr_overflow(pnote->p_offset, pnote->p_filesz))
1723 notesz = pnote->p_filesz;
1724 noteloc = pnote->p_offset;
1725 endbyte = noteloc + notesz;
1726 limited_to_first_page = noteloc < PAGE_SIZE && endbyte < PAGE_SIZE;
1728 if (limited_to_first_page) {
1729 note = (const Elf_Note *)(imgp->image_header + noteloc);
1730 note_end = (const Elf_Note *)(imgp->image_header + endbyte);
1733 firstloc = noteloc & PAGE_MASK;
1734 firstlen = PAGE_SIZE - firstloc;
1735 if (notesz < sizeof(Elf_Note) || notesz > PAGE_SIZE)
1739 if (exec_map_page(imgp, noteloc >> PAGE_SHIFT, &lwb, &page))
1741 if (firstlen < notesz) { /* crosses page boundary */
1742 data = kmalloc(notesz, M_TEMP, M_WAITOK);
1743 bcopy(page + firstloc, data, firstlen);
1745 exec_unmap_page(lwb);
1747 if (exec_map_page(imgp, (noteloc >> PAGE_SHIFT) + 1,
1749 kfree(data, M_TEMP);
1752 bcopy(page, data + firstlen, notesz - firstlen);
1753 note = note0 = (const Elf_Note *)(data);
1754 note_end = (const Elf_Note *)(data + notesz);
1756 note = note0 = (const Elf_Note *)(page + firstloc);
1757 note_end = (const Elf_Note *)(page + firstloc +
1762 for (n = 0; n < 100 && note >= note0 && note < note_end; n++) {
1763 if (!aligned(note, Elf32_Addr))
1765 if (note_overflow(note, (const char *)note_end -
1766 (const char *)note)) {
1769 note_name = (const char *)(note + 1);
1771 if (note->n_namesz == checknote->hdr.n_namesz
1772 && note->n_descsz == checknote->hdr.n_descsz
1773 && note->n_type == checknote->hdr.n_type
1774 && (strncmp(checknote->vendor, note_name,
1775 checknote->hdr.n_namesz) == 0)) {
1776 /* Fetch osreldata from ABI.note-tag */
1777 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 &&
1778 checknote->trans_osrel != NULL)
1779 checknote->trans_osrel(note, osrel);
1783 note = (const Elf_Note *)((const char *)(note + 1) +
1784 roundup2(note->n_namesz, sizeof(Elf32_Addr)) +
1785 roundup2(note->n_descsz, sizeof(Elf32_Addr)));
1788 if (!limited_to_first_page) {
1790 kfree(data, M_TEMP);
1791 exec_unmap_page(lwb);
1797 * The interpreter program header may be located beyond the first page, so
1798 * regardless of its location, a copy of the interpreter path is created so
1799 * that it may be safely referenced by the calling function in all case. The
1800 * memory is allocated by calling function, and the copying is done here.
1803 extract_interpreter(struct image_params *imgp, const Elf_Phdr *pinterpreter,
1806 boolean_t limited_to_first_page;
1807 const boolean_t result_success = FALSE;
1808 const boolean_t result_failure = TRUE;
1809 __ElfN(Off) pathloc, firstloc;
1810 __ElfN(Size) pathsz, firstlen, endbyte;
1812 struct lwbuf lwb_cache;
1815 if (hdr_overflow(pinterpreter->p_offset, pinterpreter->p_filesz))
1816 return (result_failure);
1817 pathsz = pinterpreter->p_filesz;
1818 pathloc = pinterpreter->p_offset;
1819 endbyte = pathloc + pathsz;
1821 limited_to_first_page = pathloc < PAGE_SIZE && endbyte < PAGE_SIZE;
1822 if (limited_to_first_page) {
1823 bcopy(imgp->image_header + pathloc, data, pathsz);
1824 return (result_success);
1827 firstloc = pathloc & PAGE_MASK;
1828 firstlen = PAGE_SIZE - firstloc;
1831 if (exec_map_page(imgp, pathloc >> PAGE_SHIFT, &lwb, &page))
1832 return (result_failure);
1834 if (firstlen < pathsz) { /* crosses page boundary */
1835 bcopy(page + firstloc, data, firstlen);
1837 exec_unmap_page(lwb);
1839 if (exec_map_page(imgp, (pathloc >> PAGE_SHIFT) + 1, &lwb,
1841 return (result_failure);
1842 bcopy(page, data + firstlen, pathsz - firstlen);
1844 bcopy(page + firstloc, data, pathsz);
1846 exec_unmap_page(lwb);
1847 return (result_success);
1851 __elfN(bsd_trans_osrel)(const Elf_Note *note, int32_t *osrel)
1855 p = (uintptr_t)(note + 1);
1856 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
1857 *osrel = *(const int32_t *)(p);
1863 * Tell kern_execve.c about it, with a little help from the linker.
1865 #if defined(__x86_64__)
1866 static struct execsw elf_execsw = {exec_elf64_imgact, "ELF64"};
1867 EXEC_SET_ORDERED(elf64, elf_execsw, SI_ORDER_FIRST);
1868 #else /* i386 assumed */
1869 static struct execsw elf_execsw = {exec_elf32_imgact, "ELF32"};
1870 EXEC_SET_ORDERED(elf32, elf_execsw, SI_ORDER_FIRST);
1874 __elfN(trans_prot)(Elf_Word flags)
1880 prot |= VM_PROT_EXECUTE;
1882 prot |= VM_PROT_WRITE;
1884 prot |= VM_PROT_READ;
1889 __elfN(untrans_prot)(vm_prot_t prot)
1894 if (prot & VM_PROT_EXECUTE)
1896 if (prot & VM_PROT_READ)
1898 if (prot & VM_PROT_WRITE)