+++ /dev/null
-/* $OpenBSD: dl_prebind.c,v 1.3 2015/01/16 16:18:07 deraadt Exp $ */
-
-/*
- * Copyright (c) 2006 Dale Rahn <drahn@dalerahn.com>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
-#include <sys/types.h>
-#include <sys/mman.h>
-#include <sys/exec.h>
-#include <sys/sysctl.h>
-#include <nlist.h>
-#include <string.h>
-#include <link.h>
-#include <dlfcn.h>
-#include <unistd.h>
-
-#include "syscall.h"
-#include "archdep.h"
-#include "resolve.h"
-#include "sod.h"
-#include "stdlib.h"
-#include "dl_prebind.h"
-
-void elf_dump_footer(struct prebind_footer *footer);
-void dump_prelink(Elf_Addr base, u_long size);
-void prebind_dump_footer(struct prebind_footer *footer, char *file);
-void prebind_dump_symcache(struct symcachetab *symcachetab, u_int32_t cnt);
-void prebind_dump_nameidx(struct nameidx *nameidx, u_int32_t numblibs,
- char *nametab);
-void prebind_dump_fixup(struct fixup *fixup, u_int32_t numfixups);
-void prebind_dump_libmap(u_int32_t *libmap, u_int32_t numlibs);
-struct prebind_footer *_dl_prebind_data_to_footer(void *data);
-
-void *_dl_prog_prebind_map;
-struct prebind_footer *prog_footer;
-extern char *_dl_noprebind;
-extern char *_dl_prebind_validate;
-
-int _dl_prebind_match_failed; /* = 0 */
-
-char *prebind_bind_now = "prebind";
-
-struct prebind_footer *
-_dl_prebind_data_to_footer(void *prebind_data)
-{
- u_int32_t *poffset, offset;
- struct prebind_footer *footer;
- char *c;
-
- poffset = prebind_data;
- c = prebind_data;
- offset = *poffset;
- c += offset;
- footer = (void *)c;
- return footer;
-}
-
-void
-prebind_load_exe(Elf_Phdr *phdp, elf_object_t *exe_obj)
-{
- struct prebind_footer *footer;
-
- exe_obj->prebind_data = (void *)phdp->p_vaddr;
- _dl_prog_prebind_map = exe_obj->prebind_data;
-
- footer = _dl_prebind_data_to_footer(_dl_objects->prebind_data);
-
- if (footer->bind_id[0] == BIND_ID0 &&
- footer->bind_id[1] == BIND_ID1 &&
- footer->bind_id[2] == BIND_ID2 &&
- footer->bind_id[3] == BIND_ID3 &&
- footer->prebind_version == PREBIND_VERSION) {
- prog_footer = footer;
- if (_dl_bindnow == NULL)
- _dl_bindnow = prebind_bind_now;
- } else {
- DL_DEB(("prebind data missing\n"));
- _dl_prog_prebind_map = NULL;
- }
- if (_dl_noprebind != NULL) {
- /*prog_footer is valid, we should free it */
- _dl_prog_prebind_map = NULL;
- prog_footer = NULL;
- exe_obj->prebind_data = NULL;
- if (_dl_bindnow == prebind_bind_now)
- _dl_bindnow = NULL;
- }
-#if 0
- else if (_dl_debug)
- dump_prelink((long)_dl_prog_prebind_map,
- prog_footer->prebind_size);
-#endif
-}
-
-void *
-prebind_load_fd(int fd, const char *name)
-{
- struct prebind_footer footer;
- struct nameidx *nameidx;
- void *prebind_data;
- char *nametab;
- ssize_t len;
- int idx;
-
- if (_dl_prog_prebind_map == NULL || _dl_prebind_match_failed)
- return 0;
-
- _dl_lseek(fd, -(off_t)sizeof(struct prebind_footer), SEEK_END);
- len = _dl_read(fd, (void *)&footer, sizeof(struct prebind_footer));
-
- if (len != sizeof(struct prebind_footer) ||
- footer.bind_id[0] != BIND_ID0 ||
- footer.bind_id[1] != BIND_ID1 ||
- footer.bind_id[2] != BIND_ID2 ||
- footer.bind_id[3] != BIND_ID3 ||
- footer.prebind_version != PREBIND_VERSION) {
- _dl_prebind_match_failed = 1;
- DL_DEB(("prebind match failed %s\n", name));
- return (NULL);
- }
-
- prebind_data = _dl_mmap(0, footer.prebind_size, PROT_READ,
- MAP_FILE, fd, footer.prebind_base);
- DL_DEB(("prebind_load_fd for lib %s\n", name));
-
- nameidx = _dl_prog_prebind_map + prog_footer->nameidx_idx;
- nametab = _dl_prog_prebind_map + prog_footer->nametab_idx;
-
- /* libraries are loaded in random order, so we just have
- * to look thru the list to find ourselves
- */
- for (idx = 0; idx < prog_footer->numlibs; idx++) {
- if (_dl_strcmp(nametab + nameidx[idx].name, name) == 0)
- break;
- }
-
- if (idx == prog_footer->numlibs) {
- _dl_prebind_match_failed = 1; /* not found */
- } else if (footer.id0 != nameidx[idx].id0 ||
- footer.id1 != nameidx[idx].id1) {
- _dl_prebind_match_failed = 1;
- DL_DEB(("prebind match id0 %d pid0 %d id1 %d pid1 %d\n",
- footer.id0, nameidx[idx].id0,
- footer.id1, nameidx[idx].id1));
- }
-
- if (_dl_prebind_match_failed == 1) {
- DL_DEB(("prebind match failed for %s\n", name));
- }
-
- return prebind_data;
-}
-#define NUM_STATIC_OBJS 10
-elf_object_t *objarray_static[NUM_STATIC_OBJS];
-elf_object_t **objarray;
-
-void
-prebind_symcache(elf_object_t *object, int plt)
-{
- u_int32_t *fixupidx, *fixupcnt, *libmap, *idxtolib;
- u_int32_t *poffset, offset, symcache_cnt;
- struct symcachetab *symcachetab;
- struct prebind_footer *footer;
- int i = 0, cur_obj = -1, idx;
- void *prebind_map;
- struct nameidx *nameidx;
- char *nametab, *c;
- struct fixup *fixup;
- elf_object_t *obj;
-
- struct symcachetab *s;
-
- if (object->prebind_data == NULL)
- return;
-// DL_DEB(("prebind symcache %s\n", object->load_name));
-
- obj = _dl_objects;
- while (obj != NULL) {
- if (obj == object)
- cur_obj = i;
- i++;
- obj = obj->next;
- }
-
- if (cur_obj == -1)
- return; /* unable to find object ? */
-
- if (objarray == NULL) {
- if (i <= NUM_STATIC_OBJS) {
- objarray = &objarray_static[0];
- } else {
- objarray = _dl_malloc(sizeof(elf_object_t *) * i);
- }
-
- obj = _dl_objects;
- i = 0;
- while (obj != NULL) {
- objarray[i] = obj;
- i++;
- obj = obj->next;
- }
- }
-
- poffset = (u_int32_t *)object->prebind_data;
- c = object->prebind_data;
- offset = *poffset;
- c += offset;
-
- footer = (void *)c;
- prebind_map = (void *)object->prebind_data;
- nameidx = prebind_map + footer->nameidx_idx;;
- if (plt) {
- symcachetab = prebind_map + footer->pltsymcache_idx;
- symcache_cnt = footer->pltsymcache_cnt;
-// DL_DEB(("loading plt %d\n", symcache_cnt));
- } else {
- symcachetab = prebind_map + footer->symcache_idx;
- symcache_cnt = footer->symcache_cnt;
-// DL_DEB(("loading got %d\n", symcache_cnt));
- }
- nametab = prebind_map + footer->nametab_idx;
-
- libmap = _dl_prog_prebind_map + prog_footer->libmap_idx;
- idxtolib = _dl_prog_prebind_map + libmap[cur_obj];
-
- for (i = 0; i < symcache_cnt; i++) {
- struct elf_object *tobj;
- const Elf_Sym *sym;
- const char *str;
-
- s = &(symcachetab[i]);
- if (cur_obj == 0)
- idx = s->obj_idx;
- else
- idx = idxtolib[s->obj_idx];
-
- if (idx == -1) /* somehow an invalid object ref happend */
- continue;
-#if 0
- DL_DEB(("%s:", object->load_name));
- DL_DEB(("symidx %d: obj %d %d sym %d flags %x\n",
- s->idx, s->obj_idx, idx, s->sym_idx,
- SYM_SEARCH_ALL|SYM_WARNNOTFOUND|plt));
-#endif
- tobj = objarray[idx];
- sym = tobj->dyn.symtab + s->sym_idx;
- str = tobj->dyn.strtab + sym->st_name;
-#ifdef DEBUG2
- DL_DEB(("symidx %d: obj %d %s sym %d %s flags %d %x\n",
- s->idx, s->obj_idx, tobj->load_name,
- s->sym_idx, str, SYM_SEARCH_ALL|SYM_WARNNOTFOUND|plt,
- object->obj_base + sym->st_value));
-#endif
- _dl_symcache[s->idx].obj = tobj;
- _dl_symcache[s->idx].sym = sym;
- _dl_symcache[s->idx].flags =
- SYM_SEARCH_ALL|SYM_WARNNOTFOUND|plt;
- }
-
- if (!plt) {
- fixupidx = _dl_prog_prebind_map + prog_footer->fixup_idx;
- fixup = _dl_prog_prebind_map + fixupidx[2*cur_obj];
- fixupcnt = _dl_prog_prebind_map + prog_footer->fixupcnt_idx;
-
- for (i = 0; i < fixupcnt[2*cur_obj]; i++) {
- struct fixup *f;
- struct elf_object *tobj;
- const Elf_Sym *sym;
- const char *str;
-
- f = &(fixup[i]);
-#if 0
- DL_DEB(("symidx %d: obj %d sym %d flags %x\n",
- f->sym, f->obj_idx, f->sym_idx, f->flags));
-#endif
- tobj = objarray[f->obj_idx];
- sym = tobj->dyn.symtab + f->sym_idx;
- str = tobj->dyn.strtab + sym->st_name;
-#ifdef DEBUG2
- DL_DEB(("symidx %d: obj %d %s sym %d %s flags %d %x\n",
- f->sym, f->obj_idx, tobj->load_name,
- f->sym_idx, str, SYM_SEARCH_ALL|SYM_WARNNOTFOUND|plt,
- object->obj_base + sym->st_value));
-#endif
- _dl_symcache[f->sym].obj = tobj;
- _dl_symcache[f->sym].sym = sym;
- _dl_symcache[f->sym].flags =
- SYM_SEARCH_ALL|SYM_WARNNOTFOUND|plt;
- }
- } else {
-
- fixupidx = _dl_prog_prebind_map + prog_footer->fixup_idx;
- fixup = _dl_prog_prebind_map + fixupidx[2*cur_obj+1];
- fixupcnt = _dl_prog_prebind_map + prog_footer->fixupcnt_idx;
-
-#if 0
- DL_DEB(("prebind loading symbols fixup plt %s\n",
- object->load_name));
-#endif
- for (i = 0; i < fixupcnt[2*cur_obj+1]; i++) {
- struct fixup *f;
- struct elf_object *tobj;
- const Elf_Sym *sym;
- const char *str;
-
- f = &(fixup[i]);
-#if 0
- DL_DEB(("symidx %d: obj %d sym %d flags %x\n",
- f->sym, f->obj_idx, f->sym_idx,
- SYM_SEARCH_ALL|SYM_WARNNOTFOUND|plt));
-#endif
- tobj = objarray[f->obj_idx];
- sym = tobj->dyn.symtab + f->sym_idx;
- str = tobj->dyn.strtab + sym->st_name;
-#ifdef DEBUG2
- DL_DEB(("symidx %d: obj %d %s sym %d %s flags %d %x\n",
- f->sym, f->obj_idx, tobj->load_name,
- f->sym_idx, str, SYM_SEARCH_ALL|SYM_WARNNOTFOUND|plt,
- object->obj_base + sym->st_value));
-#endif
- _dl_symcache[f->sym].obj = tobj;
- _dl_symcache[f->sym].sym = sym;
- _dl_symcache[f->sym].flags =
- SYM_SEARCH_ALL|SYM_WARNNOTFOUND|plt;
- }
- }
-// DL_DEB(("prebind_data loaded\n"));
-}
-
-void
-prebind_free(elf_object_t *object)
-{
- struct prebind_footer *footer;
-
- if (object->prebind_data == NULL)
- return;
-#ifdef DEBUG1
- DL_DEB(("prebind_free for %s %p\n", object->load_name,
- object->prebind_data));
-#endif
- if (object->prebind_data != 0) {
- footer = _dl_prebind_data_to_footer(object->prebind_data);
-
-#ifdef DEBUG1
- DL_DEB(("freeing prebind data sz %x\n", footer->prebind_size));
-#endif
-
- _dl_munmap((void *)ELF_TRUNC((long)object->prebind_data, _dl_pagesz),
- ELF_ROUND((long)object->prebind_data+footer->prebind_size,
- _dl_pagesz) - ELF_TRUNC((long)object->prebind_data, _dl_pagesz));
-
- object->prebind_data = NULL;
- _dl_prog_prebind_map = NULL;
-
- if (_dl_bindnow == prebind_bind_now)
- _dl_bindnow = NULL;
- }
-}
-
-int validate_errs;
-
-struct timeval beforetp;
-
-void
-_dl_prebind_pre_resolve()
-{
- struct prebind_footer *footer;
- elf_object_t *object;
- struct nameidx *nameidx;
- char *nametab, *name;
- int idx;
-
- if (_dl_prog_prebind_map != NULL) {
- nameidx = _dl_prog_prebind_map + prog_footer->nameidx_idx;
- nametab = _dl_prog_prebind_map + prog_footer->nametab_idx;
- for (idx = 1, object = _dl_objects->next; object != NULL;
- object = object->next, idx++) {
- if (object->prebind_data == NULL) {
- /* ld.so doesn't have prebind data */
- if (object->next == NULL)
- continue;
- DL_DEB(("missing prebind data %s\n",
- object->load_name));
- _dl_prebind_match_failed = 1;
- break;
- }
- footer = _dl_prebind_data_to_footer(
- object->prebind_data);
- if (footer == NULL ||
- nameidx[idx].id0 != footer->id0 ||
- nameidx[idx].id1 != footer->id1) {
- DL_DEB(("invalid prebind data %s\n",
- object->load_name));
- _dl_prebind_match_failed = 1;
- break;
- }
- name = object->load_name;
- if (_dl_strcmp(nametab + nameidx[idx].name, name)
- != 0) {
- DL_DEB(("invalid prebind name %s\n",
- object->load_name));
- _dl_prebind_match_failed = 1;
- break;
- }
- }
- }
-
- if (_dl_prebind_match_failed) {
- for (object = _dl_objects; object != NULL;
- object = object->next)
- prebind_free(object);
- if (_dl_bindnow == prebind_bind_now)
- _dl_bindnow = NULL;
- }
-
- if (_dl_debug)
- _dl_gettimeofday(&beforetp, NULL);
-}
-
-void
-_dl_prebind_post_resolve()
-{
- char buf[7];
- int i;
- struct timeval after_tp;
- struct timeval diff_tp;
- elf_object_t *object;
-
- if (_dl_debug) {
- _dl_gettimeofday(&after_tp, NULL);
-
- timersub(&after_tp, &beforetp, &diff_tp);
-
- for (i = 0; i < 6; i++) {
- buf[5-i] = (diff_tp.tv_usec % 10) + '0';
- diff_tp.tv_usec /= 10;
- }
- buf[6] = '\0';
-
- _dl_printf("relocation took %d.%s\n", diff_tp.tv_sec, buf);
- }
-
- for (object = _dl_objects; object != NULL; object = object->next)
- prebind_free(object);
-
- if (_dl_prebind_validate) {
- if (validate_errs) {
- _dl_printf("validate_errs %d\n", validate_errs);
- _dl_exit(20);
- } else {
- _dl_exit(0);
- }
- }
-}
-
-void
-prebind_validate(elf_object_t *req_obj, unsigned int symidx, int flags,
- const Elf_Sym *ref_sym)
-{
- const Elf_Sym *sym, **this;
- const elf_object_t *sobj;
- const char *symn;
- Elf_Addr ret;
-
- /* Don't verify non-matching flags*/
-
- sym = req_obj->dyn.symtab;
- sym += symidx;
- symn = req_obj->dyn.strtab + sym->st_name;
- this = &sym;
-
- //_dl_printf("checking %s\n", symn);
- ret = _dl_find_symbol(symn, this, flags, ref_sym, req_obj, &sobj);
-
- if (_dl_symcache[symidx].sym != *this ||
- _dl_symcache[symidx].obj != sobj) {
- _dl_printf("symbol %d mismatch on sym %s req_obj %s,\n"
- "should be obj %s is obj %s\n",
- symidx, symn, req_obj->load_name, sobj->load_name,
- _dl_symcache[symidx].obj->load_name);
- if (req_obj == sobj)
- _dl_printf("obj %p %p\n", _dl_symcache[symidx].obj, sobj);
- sym = _dl_symcache[symidx].obj->dyn.symtab;
- sym += symidx;
- symn = _dl_symcache[symidx].obj->dyn.strtab + sym->st_name;
- _dl_printf("obj %s name %s\n",
- _dl_symcache[symidx].obj->load_name,
- symn);
- }
-}
-
-#ifdef DEBUG1
-void
-prebind_dump_symcache(struct symcachetab *symcachetab, u_int32_t cnt)
-{
- struct symcachetab *s;
- int i;
-
- _dl_printf("cache: cnt %d\n", cnt);
- for (i = 0; i < cnt; i++) {
- s = &(symcachetab[i]);
- _dl_printf("symidx %d: obj %d sym %d\n",
- s->idx, s->obj_idx, s->sym_idx);
- }
-}
-
-void
-prebind_dump_nameidx(struct nameidx *nameidx, u_int32_t numlibs, char *nametab)
-{
- struct nameidx *n;
- int i;
-
- _dl_printf("libs:\n");
- for (i = 0; i < numlibs; i++) {
- _dl_printf("lib %d offset %d id0 %d, id1 %d\n", i,
- nameidx[i].name, nameidx[i].id0, nameidx[i].id1);
- }
- for (i = 0; i < numlibs; i++) {
- n = &(nameidx[i]);
- _dl_printf("nametab %p n %d\n", nametab, n->name);
- _dl_printf("lib %s %x %x\n", nametab + n->name, n->id0, n->id1);
- }
-}
-
-void
-prebind_dump_fixup(struct fixup *fixup, u_int32_t numfixups)
-{
- struct fixup *f;
- int i;
-
- _dl_printf("fixup: %d\n", numfixups);
- for (i = 0; i < numfixups; i++) {
- f = &(fixup[i]);
-
- _dl_printf("idx %d obj %d sym idx %d\n",
- f->sym, f->obj_idx, f->sym_idx);
-
- }
-}
-
-void
-prebind_dump_libmap(u_int32_t *libmap, u_int32_t numlibs)
-{
- int i;
-
- for (i = 0; i < numlibs; i++) {
- //_dl_printf("lib%d off %d %s\n", i, libmap[i], strtab+libmap[i]);
- _dl_printf("lib%d off %d\n", i, libmap[i]);
- }
-}
-
-void
-dl_dump_footer(struct prebind_footer *footer)
-{
-// _dl_printf("base %qd\n", (long long)footer->prebind_base);
- _dl_printf("nameidx_idx %d\n", footer->nameidx_idx);
- _dl_printf("symcache_idx %d\n", footer->symcache_idx);
- _dl_printf("fixupcnt_idx %d\n", footer->fixupcnt_idx);
- _dl_printf("fixup_cnt %d\n", footer->fixup_cnt);
- _dl_printf("nametab_idx %d\n", footer->nametab_idx);
- _dl_printf("symcache_cnt %d\n", footer->symcache_cnt);
- _dl_printf("fixup_cnt %d\n", footer->fixup_cnt);
- _dl_printf("numlibs %d\n", footer->numlibs);
- _dl_printf("id0 %d\n", footer->id0);
- _dl_printf("id1 %d\n", footer->id1);
-// _dl_printf("orig_size %lld\n", (long long)footer->orig_size);
- _dl_printf("version %d\n", footer->prebind_version);
- _dl_printf("bind_id %c%c%c%c\n", footer->bind_id[0],
- footer->bind_id[1], footer->bind_id[2], footer->bind_id[3]);
-}
-void
-dump_prelink(Elf_Addr base, u_long size)
-{
- u_int32_t *fixupidx, *fixupcnt, *libmap;
- struct symcachetab *symcachetab;
- struct prebind_footer *footer;
- struct nameidx *nameidx;
- struct fixup *fixup;
- char *nametab, *id;
- void *prebind_map;
- int i;
-
- id = (char *) (base+size);
- id -= 4;
- DL_DEB(("id %c %c %c %c\n", id[0], id[1], id[2], id[3]));
- footer = (void *) (base+size - sizeof (struct prebind_footer));
- dl_dump_footer(footer);
-
- prebind_map = (void *)base;
- nameidx = prebind_map + footer->nameidx_idx;;
- symcachetab = prebind_map + footer->symcache_idx;
- fixupidx = prebind_map + footer->fixup_idx;
- nametab = prebind_map + footer->nametab_idx;
- fixupcnt = prebind_map + footer->fixupcnt_idx;
- libmap = prebind_map + footer->libmap_idx;
-
- prebind_dump_symcache(symcachetab, footer->symcache_cnt);
- prebind_dump_nameidx(nameidx, footer->numlibs, nametab);
- for (i = 0; i < footer->fixup_cnt; i++) {
- _dl_printf("fixup %d cnt %d idx %d\n", i, fixupcnt[i], fixupidx[i]);
- fixup = prebind_map + fixupidx[i];
- prebind_dump_fixup(fixup, fixupcnt[i]);
- }
- prebind_dump_libmap(libmap, footer->numlibs);
-}
-#endif /* DEBUG1 */
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