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/capability.h>
41 #include <sys/fcntl.h>
42 #include <sys/imgact.h>
43 #include <sys/imgact_elf.h>
44 #include <sys/kernel.h>
46 #include <sys/malloc.h>
47 #include <sys/mount.h>
48 #include <sys/mutex.h>
50 #include <sys/namei.h>
51 #include <sys/pioctl.h>
53 #include <sys/procfs.h>
54 #include <sys/racct.h>
55 #include <sys/resourcevar.h>
56 #include <sys/sf_buf.h>
58 #include <sys/systm.h>
59 #include <sys/signalvar.h>
62 #include <sys/syscall.h>
63 #include <sys/sysctl.h>
64 #include <sys/sysent.h>
65 #include <sys/vnode.h>
66 #include <sys/syslog.h>
67 #include <sys/eventhandler.h>
72 #include <vm/vm_kern.h>
73 #include <vm/vm_param.h>
75 #include <vm/vm_map.h>
76 #include <vm/vm_object.h>
77 #include <vm/vm_extern.h>
79 #include <machine/elf.h>
80 #include <machine/md_var.h>
82 #define OLD_EI_BRAND 8
84 static int __elfN(check_header)(const Elf_Ehdr *hdr);
85 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp,
86 const char *interp, int32_t *osrel);
87 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
88 u_long *entry, size_t pagesize);
89 static int __elfN(load_section)(struct vmspace *vmspace, vm_object_t object,
90 vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz,
91 vm_prot_t prot, size_t pagesize);
92 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp);
93 static boolean_t __elfN(freebsd_trans_osrel)(const Elf_Note *note,
95 static boolean_t kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel);
96 static boolean_t __elfN(check_note)(struct image_params *imgp,
97 Elf_Brandnote *checknote, int32_t *osrel);
98 static vm_prot_t __elfN(trans_prot)(Elf_Word);
99 static Elf_Word __elfN(untrans_prot)(vm_prot_t);
101 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0,
104 #ifdef COMPRESS_USER_CORES
105 static int compress_core(gzFile, char *, char *, unsigned int,
107 #define CORE_BUF_SIZE (16 * 1024)
110 int __elfN(fallback_brand) = -1;
111 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
112 fallback_brand, CTLFLAG_RW, &__elfN(fallback_brand), 0,
113 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort");
114 TUNABLE_INT("kern.elf" __XSTRING(__ELF_WORD_SIZE) ".fallback_brand",
115 &__elfN(fallback_brand));
117 static int elf_legacy_coredump = 0;
118 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW,
119 &elf_legacy_coredump, 0, "");
121 static int __elfN(nxstack) = 0;
122 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
123 nxstack, CTLFLAG_RW, &__elfN(nxstack), 0,
124 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack");
126 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS];
128 #define trunc_page_ps(va, ps) ((va) & ~(ps - 1))
129 #define round_page_ps(va, ps) (((va) + (ps - 1)) & ~(ps - 1))
130 #define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a))
132 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD";
134 Elf_Brandnote __elfN(freebsd_brandnote) = {
135 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR),
136 .hdr.n_descsz = sizeof(int32_t),
138 .vendor = FREEBSD_ABI_VENDOR,
139 .flags = BN_TRANSLATE_OSREL,
140 .trans_osrel = __elfN(freebsd_trans_osrel)
144 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel)
148 p = (uintptr_t)(note + 1);
149 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
150 *osrel = *(const int32_t *)(p);
155 static const char GNU_ABI_VENDOR[] = "GNU";
156 static int GNU_KFREEBSD_ABI_DESC = 3;
158 Elf_Brandnote __elfN(kfreebsd_brandnote) = {
159 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
160 .hdr.n_descsz = 16, /* XXX at least 16 */
162 .vendor = GNU_ABI_VENDOR,
163 .flags = BN_TRANSLATE_OSREL,
164 .trans_osrel = kfreebsd_trans_osrel
168 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel)
170 const Elf32_Word *desc;
173 p = (uintptr_t)(note + 1);
174 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
176 desc = (const Elf32_Word *)p;
177 if (desc[0] != GNU_KFREEBSD_ABI_DESC)
181 * Debian GNU/kFreeBSD embed the earliest compatible kernel version
182 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way.
184 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3];
190 __elfN(insert_brand_entry)(Elf_Brandinfo *entry)
194 for (i = 0; i < MAX_BRANDS; i++) {
195 if (elf_brand_list[i] == NULL) {
196 elf_brand_list[i] = entry;
200 if (i == MAX_BRANDS) {
201 printf("WARNING: %s: could not insert brandinfo entry: %p\n",
209 __elfN(remove_brand_entry)(Elf_Brandinfo *entry)
213 for (i = 0; i < MAX_BRANDS; i++) {
214 if (elf_brand_list[i] == entry) {
215 elf_brand_list[i] = NULL;
225 __elfN(brand_inuse)(Elf_Brandinfo *entry)
230 sx_slock(&allproc_lock);
231 FOREACH_PROC_IN_SYSTEM(p) {
232 if (p->p_sysent == entry->sysvec) {
237 sx_sunlock(&allproc_lock);
242 static Elf_Brandinfo *
243 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
246 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
252 * We support four types of branding -- (1) the ELF EI_OSABI field
253 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string
254 * branding w/in the ELF header, (3) path of the `interp_path'
255 * field, and (4) the ".note.ABI-tag" ELF section.
258 /* Look for an ".note.ABI-tag" ELF section */
259 for (i = 0; i < MAX_BRANDS; i++) {
260 bi = elf_brand_list[i];
263 if (hdr->e_machine == bi->machine && (bi->flags &
264 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) {
265 ret = __elfN(check_note)(imgp, bi->brand_note, osrel);
271 /* If the executable has a brand, search for it in the brand list. */
272 for (i = 0; i < MAX_BRANDS; i++) {
273 bi = elf_brand_list[i];
274 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
276 if (hdr->e_machine == bi->machine &&
277 (hdr->e_ident[EI_OSABI] == bi->brand ||
278 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND],
279 bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0))
283 /* Lacking a known brand, search for a recognized interpreter. */
284 if (interp != NULL) {
285 for (i = 0; i < MAX_BRANDS; i++) {
286 bi = elf_brand_list[i];
287 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
289 if (hdr->e_machine == bi->machine &&
290 strcmp(interp, bi->interp_path) == 0)
295 /* Lacking a recognized interpreter, try the default brand */
296 for (i = 0; i < MAX_BRANDS; i++) {
297 bi = elf_brand_list[i];
298 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY)
300 if (hdr->e_machine == bi->machine &&
301 __elfN(fallback_brand) == bi->brand)
308 __elfN(check_header)(const Elf_Ehdr *hdr)
314 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
315 hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
316 hdr->e_ident[EI_VERSION] != EV_CURRENT ||
317 hdr->e_phentsize != sizeof(Elf_Phdr) ||
318 hdr->e_version != ELF_TARG_VER)
322 * Make sure we have at least one brand for this machine.
325 for (i = 0; i < MAX_BRANDS; i++) {
326 bi = elf_brand_list[i];
327 if (bi != NULL && bi->machine == hdr->e_machine)
337 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
338 vm_offset_t start, vm_offset_t end, vm_prot_t prot)
345 * Create the page if it doesn't exist yet. Ignore errors.
348 vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end),
349 VM_PROT_ALL, VM_PROT_ALL, 0);
353 * Find the page from the underlying object.
356 sf = vm_imgact_map_page(object, offset);
358 return (KERN_FAILURE);
359 off = offset - trunc_page(offset);
360 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start,
362 vm_imgact_unmap_page(sf);
364 return (KERN_FAILURE);
368 return (KERN_SUCCESS);
372 __elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
373 vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow)
380 if (start != trunc_page(start)) {
381 rv = __elfN(map_partial)(map, object, offset, start,
382 round_page(start), prot);
385 offset += round_page(start) - start;
386 start = round_page(start);
388 if (end != round_page(end)) {
389 rv = __elfN(map_partial)(map, object, offset +
390 trunc_page(end) - start, trunc_page(end), end, prot);
393 end = trunc_page(end);
396 if (offset & PAGE_MASK) {
398 * The mapping is not page aligned. This means we have
399 * to copy the data. Sigh.
401 rv = vm_map_find(map, NULL, 0, &start, end - start,
402 FALSE, prot | VM_PROT_WRITE, VM_PROT_ALL, 0);
406 return (KERN_SUCCESS);
407 for (; start < end; start += sz) {
408 sf = vm_imgact_map_page(object, offset);
410 return (KERN_FAILURE);
411 off = offset - trunc_page(offset);
413 if (sz > PAGE_SIZE - off)
414 sz = PAGE_SIZE - off;
415 error = copyout((caddr_t)sf_buf_kva(sf) + off,
417 vm_imgact_unmap_page(sf);
419 return (KERN_FAILURE);
425 vm_object_reference(object);
427 rv = vm_map_insert(map, object, offset, start, end,
428 prot, VM_PROT_ALL, cow);
430 if (rv != KERN_SUCCESS)
431 vm_object_deallocate(object);
435 return (KERN_SUCCESS);
440 __elfN(load_section)(struct vmspace *vmspace,
441 vm_object_t object, vm_offset_t offset,
442 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot,
447 vm_offset_t map_addr;
450 vm_offset_t file_addr;
453 * It's necessary to fail if the filsz + offset taken from the
454 * header is greater than the actual file pager object's size.
455 * If we were to allow this, then the vm_map_find() below would
456 * walk right off the end of the file object and into the ether.
458 * While I'm here, might as well check for something else that
459 * is invalid: filsz cannot be greater than memsz.
461 if ((off_t)filsz + offset > object->un_pager.vnp.vnp_size ||
463 uprintf("elf_load_section: truncated ELF file\n");
467 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize);
468 file_addr = trunc_page_ps(offset, pagesize);
471 * We have two choices. We can either clear the data in the last page
472 * of an oversized mapping, or we can start the anon mapping a page
473 * early and copy the initialized data into that first page. We
474 * choose the second..
477 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr;
479 map_len = round_page_ps(offset + filsz, pagesize) - file_addr;
482 /* cow flags: don't dump readonly sections in core */
483 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT |
484 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP);
486 rv = __elfN(map_insert)(&vmspace->vm_map,
488 file_addr, /* file offset */
489 map_addr, /* virtual start */
490 map_addr + map_len,/* virtual end */
493 if (rv != KERN_SUCCESS)
496 /* we can stop now if we've covered it all */
497 if (memsz == filsz) {
504 * We have to get the remaining bit of the file into the first part
505 * of the oversized map segment. This is normally because the .data
506 * segment in the file is extended to provide bss. It's a neat idea
507 * to try and save a page, but it's a pain in the behind to implement.
509 copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize);
510 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize);
511 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) -
514 /* This had damn well better be true! */
516 rv = __elfN(map_insert)(&vmspace->vm_map, NULL, 0, map_addr,
517 map_addr + map_len, VM_PROT_ALL, 0);
518 if (rv != KERN_SUCCESS) {
526 sf = vm_imgact_map_page(object, offset + filsz);
530 /* send the page fragment to user space */
531 off = trunc_page_ps(offset + filsz, pagesize) -
532 trunc_page(offset + filsz);
533 error = copyout((caddr_t)sf_buf_kva(sf) + off,
534 (caddr_t)map_addr, copy_len);
535 vm_imgact_unmap_page(sf);
542 * set it to the specified protection.
543 * XXX had better undo the damage from pasting over the cracks here!
545 vm_map_protect(&vmspace->vm_map, trunc_page(map_addr),
546 round_page(map_addr + map_len), prot, FALSE);
552 * Load the file "file" into memory. It may be either a shared object
555 * The "addr" reference parameter is in/out. On entry, it specifies
556 * the address where a shared object should be loaded. If the file is
557 * an executable, this value is ignored. On exit, "addr" specifies
558 * where the file was actually loaded.
560 * The "entry" reference parameter is out only. On exit, it specifies
561 * the entry point for the loaded file.
564 __elfN(load_file)(struct proc *p, const char *file, u_long *addr,
565 u_long *entry, size_t pagesize)
570 struct image_params image_params;
572 const Elf_Ehdr *hdr = NULL;
573 const Elf_Phdr *phdr = NULL;
574 struct nameidata *nd;
575 struct vmspace *vmspace = p->p_vmspace;
577 struct image_params *imgp;
580 u_long base_addr = 0;
581 int vfslocked, error, i, numsegs;
583 #ifdef CAPABILITY_MODE
585 * XXXJA: This check can go away once we are sufficiently confident
586 * that the checks in namei() are correct.
588 if (IN_CAPABILITY_MODE(curthread))
592 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK);
594 attr = &tempdata->attr;
595 imgp = &tempdata->image_params;
598 * Initialize part of the common data
602 imgp->firstpage = NULL;
603 imgp->image_header = NULL;
605 imgp->execlabel = NULL;
607 NDINIT(nd, LOOKUP, MPSAFE|LOCKLEAF|FOLLOW, UIO_SYSSPACE, file,
610 if ((error = namei(nd)) != 0) {
614 vfslocked = NDHASGIANT(nd);
615 NDFREE(nd, NDF_ONLY_PNBUF);
616 imgp->vp = nd->ni_vp;
619 * Check permissions, modes, uid, etc on the file, and "open" it.
621 error = exec_check_permissions(imgp);
625 error = exec_map_first_page(imgp);
630 * Also make certain that the interpreter stays the same, so set
631 * its VV_TEXT flag, too.
633 nd->ni_vp->v_vflag |= VV_TEXT;
635 imgp->object = nd->ni_vp->v_object;
637 hdr = (const Elf_Ehdr *)imgp->image_header;
638 if ((error = __elfN(check_header)(hdr)) != 0)
640 if (hdr->e_type == ET_DYN)
642 else if (hdr->e_type == ET_EXEC)
649 /* Only support headers that fit within first page for now */
650 /* (multiplication of two Elf_Half fields will not overflow) */
651 if ((hdr->e_phoff > PAGE_SIZE) ||
652 (hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE - hdr->e_phoff) {
657 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
658 if (!aligned(phdr, Elf_Addr)) {
663 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) {
664 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) {
665 /* Loadable segment */
666 prot = __elfN(trans_prot)(phdr[i].p_flags);
667 if ((error = __elfN(load_section)(vmspace,
668 imgp->object, phdr[i].p_offset,
669 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase,
670 phdr[i].p_memsz, phdr[i].p_filesz, prot,
674 * Establish the base address if this is the
678 base_addr = trunc_page(phdr[i].p_vaddr +
684 *entry = (unsigned long)hdr->e_entry + rbase;
688 exec_unmap_first_page(imgp);
693 VFS_UNLOCK_GIANT(vfslocked);
694 free(tempdata, M_TEMP);
700 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
702 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
703 const Elf_Phdr *phdr;
704 Elf_Auxargs *elf_auxargs;
705 struct vmspace *vmspace;
707 u_long text_size = 0, data_size = 0, total_size = 0;
708 u_long text_addr = 0, data_addr = 0;
709 u_long seg_size, seg_addr;
710 u_long addr, baddr, et_dyn_addr, entry = 0, proghdr = 0;
713 const char *interp = NULL, *newinterp = NULL;
714 Elf_Brandinfo *brand_info;
716 struct sysentvec *sv;
719 * Do we have a valid ELF header ?
721 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later
722 * if particular brand doesn't support it.
724 if (__elfN(check_header)(hdr) != 0 ||
725 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN))
729 * From here on down, we return an errno, not -1, as we've
730 * detected an ELF file.
733 if ((hdr->e_phoff > PAGE_SIZE) ||
734 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) {
735 /* Only support headers in first page for now */
738 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
739 if (!aligned(phdr, Elf_Addr))
743 for (i = 0; i < hdr->e_phnum; i++) {
744 switch (phdr[i].p_type) {
747 baddr = phdr[i].p_vaddr;
751 /* Path to interpreter */
752 if (phdr[i].p_filesz > MAXPATHLEN ||
753 phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE)
755 interp = imgp->image_header + phdr[i].p_offset;
760 __elfN(trans_prot)(phdr[i].p_flags);
765 brand_info = __elfN(get_brandinfo)(imgp, interp, &osrel);
766 if (brand_info == NULL) {
767 uprintf("ELF binary type \"%u\" not known.\n",
768 hdr->e_ident[EI_OSABI]);
771 if (hdr->e_type == ET_DYN) {
772 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0)
775 * Honour the base load address from the dso if it is
776 * non-zero for some reason.
779 et_dyn_addr = ET_DYN_LOAD_ADDR;
784 sv = brand_info->sysvec;
785 if (interp != NULL && brand_info->interp_newpath != NULL)
786 newinterp = brand_info->interp_newpath;
789 * Avoid a possible deadlock if the current address space is destroyed
790 * and that address space maps the locked vnode. In the common case,
791 * the locked vnode's v_usecount is decremented but remains greater
792 * than zero. Consequently, the vnode lock is not needed by vrele().
793 * However, in cases where the vnode lock is external, such as nullfs,
794 * v_usecount may become zero.
796 VOP_UNLOCK(imgp->vp, 0);
798 error = exec_new_vmspace(imgp, sv);
799 imgp->proc->p_sysent = sv;
801 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
805 vmspace = imgp->proc->p_vmspace;
807 for (i = 0; i < hdr->e_phnum; i++) {
808 switch (phdr[i].p_type) {
809 case PT_LOAD: /* Loadable segment */
810 if (phdr[i].p_memsz == 0)
812 prot = __elfN(trans_prot)(phdr[i].p_flags);
814 #if defined(__ia64__) && __ELF_WORD_SIZE == 32 && defined(IA32_ME_HARDER)
816 * Some x86 binaries assume read == executable,
817 * notably the M3 runtime and therefore cvsup
819 if (prot & VM_PROT_READ)
820 prot |= VM_PROT_EXECUTE;
823 if ((error = __elfN(load_section)(vmspace,
824 imgp->object, phdr[i].p_offset,
825 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr,
826 phdr[i].p_memsz, phdr[i].p_filesz, prot,
827 sv->sv_pagesize)) != 0)
831 * If this segment contains the program headers,
832 * remember their virtual address for the AT_PHDR
833 * aux entry. Static binaries don't usually include
836 if (phdr[i].p_offset == 0 &&
837 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize
839 proghdr = phdr[i].p_vaddr + hdr->e_phoff +
842 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr);
843 seg_size = round_page(phdr[i].p_memsz +
844 phdr[i].p_vaddr + et_dyn_addr - seg_addr);
847 * Make the largest executable segment the official
848 * text segment and all others data.
850 * Note that obreak() assumes that data_addr +
851 * data_size == end of data load area, and the ELF
852 * file format expects segments to be sorted by
853 * address. If multiple data segments exist, the
854 * last one will be used.
857 if (phdr[i].p_flags & PF_X && text_size < seg_size) {
858 text_size = seg_size;
859 text_addr = seg_addr;
861 data_size = seg_size;
862 data_addr = seg_addr;
864 total_size += seg_size;
866 case PT_PHDR: /* Program header table info */
867 proghdr = phdr[i].p_vaddr + et_dyn_addr;
874 if (data_addr == 0 && data_size == 0) {
875 data_addr = text_addr;
876 data_size = text_size;
879 entry = (u_long)hdr->e_entry + et_dyn_addr;
882 * Check limits. It should be safe to check the
883 * limits after loading the segments since we do
884 * not actually fault in all the segments pages.
886 PROC_LOCK(imgp->proc);
887 if (data_size > lim_cur(imgp->proc, RLIMIT_DATA) ||
888 text_size > maxtsiz ||
889 total_size > lim_cur(imgp->proc, RLIMIT_VMEM) ||
890 racct_set(imgp->proc, RACCT_DATA, data_size) != 0 ||
891 racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) {
892 PROC_UNLOCK(imgp->proc);
896 vmspace->vm_tsize = text_size >> PAGE_SHIFT;
897 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr;
898 vmspace->vm_dsize = data_size >> PAGE_SHIFT;
899 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr;
902 * We load the dynamic linker where a userland call
903 * to mmap(0, ...) would put it. The rationale behind this
904 * calculation is that it leaves room for the heap to grow to
905 * its maximum allowed size.
907 addr = round_page((vm_offset_t)imgp->proc->p_vmspace->vm_daddr +
908 lim_max(imgp->proc, RLIMIT_DATA));
909 PROC_UNLOCK(imgp->proc);
911 imgp->entry_addr = entry;
913 if (interp != NULL) {
914 int have_interp = FALSE;
915 VOP_UNLOCK(imgp->vp, 0);
916 if (brand_info->emul_path != NULL &&
917 brand_info->emul_path[0] != '\0') {
918 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
919 snprintf(path, MAXPATHLEN, "%s%s",
920 brand_info->emul_path, interp);
921 error = __elfN(load_file)(imgp->proc, path, &addr,
922 &imgp->entry_addr, sv->sv_pagesize);
927 if (!have_interp && newinterp != NULL) {
928 error = __elfN(load_file)(imgp->proc, newinterp, &addr,
929 &imgp->entry_addr, sv->sv_pagesize);
934 error = __elfN(load_file)(imgp->proc, interp, &addr,
935 &imgp->entry_addr, sv->sv_pagesize);
937 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
939 uprintf("ELF interpreter %s not found\n", interp);
946 * Construct auxargs table (used by the fixup routine)
948 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK);
949 elf_auxargs->execfd = -1;
950 elf_auxargs->phdr = proghdr;
951 elf_auxargs->phent = hdr->e_phentsize;
952 elf_auxargs->phnum = hdr->e_phnum;
953 elf_auxargs->pagesz = PAGE_SIZE;
954 elf_auxargs->base = addr;
955 elf_auxargs->flags = 0;
956 elf_auxargs->entry = entry;
958 imgp->auxargs = elf_auxargs;
959 imgp->interpreted = 0;
960 imgp->reloc_base = addr;
961 imgp->proc->p_osrel = osrel;
966 #define suword __CONCAT(suword, __ELF_WORD_SIZE)
969 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp)
971 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
975 base = (Elf_Addr *)*stack_base;
976 pos = base + (imgp->args->argc + imgp->args->envc + 2);
978 if (args->execfd != -1)
979 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
980 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
981 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
982 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
983 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
984 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
985 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
986 AUXARGS_ENTRY(pos, AT_BASE, args->base);
987 if (imgp->execpathp != 0)
988 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp);
989 AUXARGS_ENTRY(pos, AT_OSRELDATE, osreldate);
990 if (imgp->canary != 0) {
991 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary);
992 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen);
994 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus);
995 if (imgp->pagesizes != 0) {
996 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes);
997 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen);
999 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj
1000 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot :
1001 imgp->sysent->sv_stackprot);
1002 AUXARGS_ENTRY(pos, AT_NULL, 0);
1004 free(imgp->auxargs, M_TEMP);
1005 imgp->auxargs = NULL;
1008 suword(base, (long)imgp->args->argc);
1009 *stack_base = (register_t *)base;
1014 * Code for generating ELF core dumps.
1017 typedef void (*segment_callback)(vm_map_entry_t, void *);
1019 /* Closure for cb_put_phdr(). */
1020 struct phdr_closure {
1021 Elf_Phdr *phdr; /* Program header to fill in */
1022 Elf_Off offset; /* Offset of segment in core file */
1025 /* Closure for cb_size_segment(). */
1026 struct sseg_closure {
1027 int count; /* Count of writable segments. */
1028 size_t size; /* Total size of all writable segments. */
1031 static void cb_put_phdr(vm_map_entry_t, void *);
1032 static void cb_size_segment(vm_map_entry_t, void *);
1033 static void each_writable_segment(struct thread *, segment_callback, void *);
1034 static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *,
1035 int, void *, size_t, gzFile);
1036 static void __elfN(puthdr)(struct thread *, void *, size_t *, int);
1037 static void __elfN(putnote)(void *, size_t *, const char *, int,
1038 const void *, size_t);
1040 #ifdef COMPRESS_USER_CORES
1041 extern int compress_user_cores;
1042 extern int compress_user_cores_gzlevel;
1046 core_output(struct vnode *vp, void *base, size_t len, off_t offset,
1047 struct ucred *active_cred, struct ucred *file_cred,
1048 struct thread *td, char *core_buf, gzFile gzfile) {
1052 #ifdef COMPRESS_USER_CORES
1053 error = compress_core(gzfile, base, core_buf, len, td);
1055 panic("shouldn't be here");
1058 error = vn_rdwr_inchunks(UIO_WRITE, vp, base, len, offset,
1059 UIO_USERSPACE, IO_UNIT | IO_DIRECT, active_cred, file_cred,
1066 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags)
1068 struct ucred *cred = td->td_ucred;
1070 struct sseg_closure seginfo;
1074 gzFile gzfile = Z_NULL;
1075 char *core_buf = NULL;
1076 #ifdef COMPRESS_USER_CORES
1077 char gzopen_flags[8];
1079 int doing_compress = flags & IMGACT_CORE_COMPRESS;
1084 #ifdef COMPRESS_USER_CORES
1085 if (doing_compress) {
1088 if (compress_user_cores_gzlevel >= 0 &&
1089 compress_user_cores_gzlevel <= 9)
1090 *p++ = '0' + compress_user_cores_gzlevel;
1092 gzfile = gz_open("", gzopen_flags, vp);
1093 if (gzfile == Z_NULL) {
1097 core_buf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO);
1105 /* Size the program segments. */
1108 each_writable_segment(td, cb_size_segment, &seginfo);
1111 * Calculate the size of the core file header area by making
1112 * a dry run of generating it. Nothing is written, but the
1113 * size is calculated.
1116 __elfN(puthdr)(td, (void *)NULL, &hdrsize, seginfo.count);
1119 PROC_LOCK(td->td_proc);
1120 error = racct_add(td->td_proc, RACCT_CORE, hdrsize + seginfo.size);
1121 PROC_UNLOCK(td->td_proc);
1127 if (hdrsize + seginfo.size >= limit) {
1133 * Allocate memory for building the header, fill it up,
1136 hdr = malloc(hdrsize, M_TEMP, M_WAITOK);
1141 error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize,
1144 /* Write the contents of all of the writable segments. */
1150 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
1152 for (i = 0; i < seginfo.count; i++) {
1153 error = core_output(vp, (caddr_t)(uintptr_t)php->p_vaddr,
1154 php->p_filesz, offset, cred, NOCRED, curthread, core_buf, gzfile);
1157 offset += php->p_filesz;
1163 "Failed to write core file for process %s (error %d)\n",
1164 curproc->p_comm, error);
1168 #ifdef COMPRESS_USER_CORES
1170 free(core_buf, M_TEMP);
1181 * A callback for each_writable_segment() to write out the segment's
1182 * program header entry.
1185 cb_put_phdr(entry, closure)
1186 vm_map_entry_t entry;
1189 struct phdr_closure *phc = (struct phdr_closure *)closure;
1190 Elf_Phdr *phdr = phc->phdr;
1192 phc->offset = round_page(phc->offset);
1194 phdr->p_type = PT_LOAD;
1195 phdr->p_offset = phc->offset;
1196 phdr->p_vaddr = entry->start;
1198 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
1199 phdr->p_align = PAGE_SIZE;
1200 phdr->p_flags = __elfN(untrans_prot)(entry->protection);
1202 phc->offset += phdr->p_filesz;
1207 * A callback for each_writable_segment() to gather information about
1208 * the number of segments and their total size.
1211 cb_size_segment(entry, closure)
1212 vm_map_entry_t entry;
1215 struct sseg_closure *ssc = (struct sseg_closure *)closure;
1218 ssc->size += entry->end - entry->start;
1222 * For each writable segment in the process's memory map, call the given
1223 * function with a pointer to the map entry and some arbitrary
1224 * caller-supplied data.
1227 each_writable_segment(td, func, closure)
1229 segment_callback func;
1232 struct proc *p = td->td_proc;
1233 vm_map_t map = &p->p_vmspace->vm_map;
1234 vm_map_entry_t entry;
1235 vm_object_t backing_object, object;
1236 boolean_t ignore_entry;
1238 vm_map_lock_read(map);
1239 for (entry = map->header.next; entry != &map->header;
1240 entry = entry->next) {
1242 * Don't dump inaccessible mappings, deal with legacy
1245 * Note that read-only segments related to the elf binary
1246 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer
1247 * need to arbitrarily ignore such segments.
1249 if (elf_legacy_coredump) {
1250 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW)
1253 if ((entry->protection & VM_PROT_ALL) == 0)
1258 * Dont include memory segment in the coredump if
1259 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in
1260 * madvise(2). Do not dump submaps (i.e. parts of the
1263 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP))
1266 if ((object = entry->object.vm_object) == NULL)
1269 /* Ignore memory-mapped devices and such things. */
1270 VM_OBJECT_LOCK(object);
1271 while ((backing_object = object->backing_object) != NULL) {
1272 VM_OBJECT_LOCK(backing_object);
1273 VM_OBJECT_UNLOCK(object);
1274 object = backing_object;
1276 ignore_entry = object->type != OBJT_DEFAULT &&
1277 object->type != OBJT_SWAP && object->type != OBJT_VNODE;
1278 VM_OBJECT_UNLOCK(object);
1282 (*func)(entry, closure);
1284 vm_map_unlock_read(map);
1288 * Write the core file header to the file, including padding up to
1289 * the page boundary.
1292 __elfN(corehdr)(td, vp, cred, numsegs, hdr, hdrsize, gzfile)
1303 /* Fill in the header. */
1304 bzero(hdr, hdrsize);
1306 __elfN(puthdr)(td, hdr, &off, numsegs);
1309 /* Write it to the core file. */
1310 return (vn_rdwr_inchunks(UIO_WRITE, vp, hdr, hdrsize, (off_t)0,
1311 UIO_SYSSPACE, IO_UNIT | IO_DIRECT, cred, NOCRED, NULL,
1314 #ifdef COMPRESS_USER_CORES
1315 if (gzwrite(gzfile, hdr, hdrsize) != hdrsize) {
1317 "Failed to compress core file header for process"
1318 " %s.\n", curproc->p_comm);
1325 panic("shouldn't be here");
1330 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1331 #include <compat/freebsd32/freebsd32.h>
1333 typedef struct prstatus32 elf_prstatus_t;
1334 typedef struct prpsinfo32 elf_prpsinfo_t;
1335 typedef struct fpreg32 elf_prfpregset_t;
1336 typedef struct fpreg32 elf_fpregset_t;
1337 typedef struct reg32 elf_gregset_t;
1338 typedef struct thrmisc32 elf_thrmisc_t;
1340 typedef prstatus_t elf_prstatus_t;
1341 typedef prpsinfo_t elf_prpsinfo_t;
1342 typedef prfpregset_t elf_prfpregset_t;
1343 typedef prfpregset_t elf_fpregset_t;
1344 typedef gregset_t elf_gregset_t;
1345 typedef thrmisc_t elf_thrmisc_t;
1349 __elfN(puthdr)(struct thread *td, void *dst, size_t *off, int numsegs)
1352 elf_prstatus_t status;
1353 elf_prfpregset_t fpregset;
1354 elf_prpsinfo_t psinfo;
1355 elf_thrmisc_t thrmisc;
1357 elf_prstatus_t *status;
1358 elf_prfpregset_t *fpregset;
1359 elf_prpsinfo_t *psinfo;
1360 elf_thrmisc_t *thrmisc;
1363 size_t ehoff, noteoff, notesz, phoff;
1368 *off += sizeof(Elf_Ehdr);
1371 *off += (numsegs + 1) * sizeof(Elf_Phdr);
1375 * Don't allocate space for the notes if we're just calculating
1376 * the size of the header. We also don't collect the data.
1379 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO|M_WAITOK);
1380 status = &tempdata->status;
1381 fpregset = &tempdata->fpregset;
1382 psinfo = &tempdata->psinfo;
1383 thrmisc = &tempdata->thrmisc;
1393 psinfo->pr_version = PRPSINFO_VERSION;
1394 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t);
1395 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
1397 * XXX - We don't fill in the command line arguments properly
1400 strlcpy(psinfo->pr_psargs, p->p_comm,
1401 sizeof(psinfo->pr_psargs));
1403 __elfN(putnote)(dst, off, "FreeBSD", NT_PRPSINFO, psinfo,
1407 * To have the debugger select the right thread (LWP) as the initial
1408 * thread, we dump the state of the thread passed to us in td first.
1409 * This is the thread that causes the core dump and thus likely to
1410 * be the right thread one wants to have selected in the debugger.
1413 while (thr != NULL) {
1415 status->pr_version = PRSTATUS_VERSION;
1416 status->pr_statussz = sizeof(elf_prstatus_t);
1417 status->pr_gregsetsz = sizeof(elf_gregset_t);
1418 status->pr_fpregsetsz = sizeof(elf_fpregset_t);
1419 status->pr_osreldate = osreldate;
1420 status->pr_cursig = p->p_sig;
1421 status->pr_pid = thr->td_tid;
1422 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1423 fill_regs32(thr, &status->pr_reg);
1424 fill_fpregs32(thr, fpregset);
1426 fill_regs(thr, &status->pr_reg);
1427 fill_fpregs(thr, fpregset);
1429 memset(&thrmisc->_pad, 0, sizeof (thrmisc->_pad));
1430 strcpy(thrmisc->pr_tname, thr->td_name);
1432 __elfN(putnote)(dst, off, "FreeBSD", NT_PRSTATUS, status,
1434 __elfN(putnote)(dst, off, "FreeBSD", NT_FPREGSET, fpregset,
1436 __elfN(putnote)(dst, off, "FreeBSD", NT_THRMISC, thrmisc,
1439 * Allow for MD specific notes, as well as any MD
1440 * specific preparations for writing MI notes.
1442 __elfN(dump_thread)(thr, dst, off);
1444 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) :
1445 TAILQ_NEXT(thr, td_plist);
1447 thr = TAILQ_NEXT(thr, td_plist);
1450 notesz = *off - noteoff;
1453 free(tempdata, M_TEMP);
1455 /* Align up to a page boundary for the program segments. */
1456 *off = round_page(*off);
1461 struct phdr_closure phc;
1464 * Fill in the ELF header.
1466 ehdr = (Elf_Ehdr *)((char *)dst + ehoff);
1467 ehdr->e_ident[EI_MAG0] = ELFMAG0;
1468 ehdr->e_ident[EI_MAG1] = ELFMAG1;
1469 ehdr->e_ident[EI_MAG2] = ELFMAG2;
1470 ehdr->e_ident[EI_MAG3] = ELFMAG3;
1471 ehdr->e_ident[EI_CLASS] = ELF_CLASS;
1472 ehdr->e_ident[EI_DATA] = ELF_DATA;
1473 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1474 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
1475 ehdr->e_ident[EI_ABIVERSION] = 0;
1476 ehdr->e_ident[EI_PAD] = 0;
1477 ehdr->e_type = ET_CORE;
1478 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32
1479 ehdr->e_machine = ELF_ARCH32;
1481 ehdr->e_machine = ELF_ARCH;
1483 ehdr->e_version = EV_CURRENT;
1485 ehdr->e_phoff = phoff;
1487 ehdr->e_ehsize = sizeof(Elf_Ehdr);
1488 ehdr->e_phentsize = sizeof(Elf_Phdr);
1489 ehdr->e_phnum = numsegs + 1;
1490 ehdr->e_shentsize = sizeof(Elf_Shdr);
1492 ehdr->e_shstrndx = SHN_UNDEF;
1495 * Fill in the program header entries.
1497 phdr = (Elf_Phdr *)((char *)dst + phoff);
1499 /* The note segement. */
1500 phdr->p_type = PT_NOTE;
1501 phdr->p_offset = noteoff;
1504 phdr->p_filesz = notesz;
1510 /* All the writable segments from the program. */
1513 each_writable_segment(td, cb_put_phdr, &phc);
1518 __elfN(putnote)(void *dst, size_t *off, const char *name, int type,
1519 const void *desc, size_t descsz)
1523 note.n_namesz = strlen(name) + 1;
1524 note.n_descsz = descsz;
1527 bcopy(¬e, (char *)dst + *off, sizeof note);
1528 *off += sizeof note;
1530 bcopy(name, (char *)dst + *off, note.n_namesz);
1531 *off += roundup2(note.n_namesz, sizeof(Elf_Size));
1533 bcopy(desc, (char *)dst + *off, note.n_descsz);
1534 *off += roundup2(note.n_descsz, sizeof(Elf_Size));
1538 * Try to find the appropriate ABI-note section for checknote,
1539 * fetch the osreldate for binary from the ELF OSABI-note. Only the
1540 * first page of the image is searched, the same as for headers.
1543 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote,
1546 const Elf_Note *note, *note0, *note_end;
1547 const Elf_Phdr *phdr, *pnote;
1548 const Elf_Ehdr *hdr;
1549 const char *note_name;
1553 hdr = (const Elf_Ehdr *)imgp->image_header;
1554 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
1556 for (i = 0; i < hdr->e_phnum; i++) {
1557 if (phdr[i].p_type == PT_NOTE) {
1563 if (pnote == NULL || pnote->p_offset >= PAGE_SIZE ||
1564 pnote->p_offset + pnote->p_filesz >= PAGE_SIZE)
1567 note = note0 = (const Elf_Note *)(imgp->image_header + pnote->p_offset);
1568 note_end = (const Elf_Note *)(imgp->image_header +
1569 pnote->p_offset + pnote->p_filesz);
1570 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) {
1571 if (!aligned(note, Elf32_Addr))
1573 if (note->n_namesz != checknote->hdr.n_namesz ||
1574 note->n_descsz != checknote->hdr.n_descsz ||
1575 note->n_type != checknote->hdr.n_type)
1577 note_name = (const char *)(note + 1);
1578 if (strncmp(checknote->vendor, note_name,
1579 checknote->hdr.n_namesz) != 0)
1583 * Fetch the osreldate for binary
1584 * from the ELF OSABI-note if necessary.
1586 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 &&
1587 checknote->trans_osrel != NULL)
1588 return (checknote->trans_osrel(note, osrel));
1592 note = (const Elf_Note *)((const char *)(note + 1) +
1593 roundup2(note->n_namesz, sizeof(Elf32_Addr)) +
1594 roundup2(note->n_descsz, sizeof(Elf32_Addr)));
1601 * Tell kern_execve.c about it, with a little help from the linker.
1603 static struct execsw __elfN(execsw) = {
1604 __CONCAT(exec_, __elfN(imgact)),
1605 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE))
1607 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
1609 #ifdef COMPRESS_USER_CORES
1611 * Compress and write out a core segment for a user process.
1613 * 'inbuf' is the starting address of a VM segment in the process' address
1614 * space that is to be compressed and written out to the core file. 'dest_buf'
1615 * is a buffer in the kernel's address space. The segment is copied from
1616 * 'inbuf' to 'dest_buf' first before being processed by the compression
1617 * routine gzwrite(). This copying is necessary because the content of the VM
1618 * segment may change between the compression pass and the crc-computation pass
1619 * in gzwrite(). This is because realtime threads may preempt the UNIX kernel.
1622 compress_core (gzFile file, char *inbuf, char *dest_buf, unsigned int len,
1627 unsigned int chunk_len;
1630 chunk_len = (len > CORE_BUF_SIZE) ? CORE_BUF_SIZE : len;
1631 copyin(inbuf, dest_buf, chunk_len);
1632 len_compressed = gzwrite(file, dest_buf, chunk_len);
1634 EVENTHANDLER_INVOKE(app_coredump_progress, td, len_compressed);
1636 if ((unsigned int)len_compressed != chunk_len) {
1638 "compress_core: length mismatch (0x%x returned, "
1639 "0x%x expected)\n", len_compressed, chunk_len);
1640 EVENTHANDLER_INVOKE(app_coredump_error, td,
1641 "compress_core: length mismatch %x -> %x",
1642 chunk_len, len_compressed);
1653 #endif /* COMPRESS_USER_CORES */
1656 __elfN(trans_prot)(Elf_Word flags)
1662 prot |= VM_PROT_EXECUTE;
1664 prot |= VM_PROT_WRITE;
1666 prot |= VM_PROT_READ;
1671 __elfN(untrans_prot)(vm_prot_t prot)
1676 if (prot & VM_PROT_EXECUTE)
1678 if (prot & VM_PROT_READ)
1680 if (prot & VM_PROT_WRITE)