2b39d4f68b
According to ELF ABI, alignment 0 and 1 has the same meaning: the section has no alignment constraints. PR: 196715 Sponsored by: The FreeBSD Foundation
1551 lines
38 KiB
C
1551 lines
38 KiB
C
/*-
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* Copyright (c) 2007-2011,2014 Kai Wang
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <libgen.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "elfcopy.h"
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ELFTC_VCSID("$Id: sections.c 3134 2014-12-23 10:43:59Z kaiwang27 $");
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static void add_gnu_debuglink(struct elfcopy *ecp);
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static uint32_t calc_crc32(const char *p, size_t len, uint32_t crc);
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static void check_section_rename(struct elfcopy *ecp, struct section *s);
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static void filter_reloc(struct elfcopy *ecp, struct section *s);
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static int get_section_flags(struct elfcopy *ecp, const char *name);
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static void insert_sections(struct elfcopy *ecp);
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static void insert_to_strtab(struct section *t, const char *s);
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static int is_append_section(struct elfcopy *ecp, const char *name);
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static int is_compress_section(struct elfcopy *ecp, const char *name);
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static int is_debug_section(const char *name);
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static int is_modify_section(struct elfcopy *ecp, const char *name);
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static int is_print_section(struct elfcopy *ecp, const char *name);
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static int lookup_string(struct section *t, const char *s);
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static void modify_section(struct elfcopy *ecp, struct section *s);
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static void pad_section(struct elfcopy *ecp, struct section *s);
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static void print_data(const char *d, size_t sz);
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static void print_section(struct section *s);
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static void *read_section(struct section *s, size_t *size);
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static void update_reloc(struct elfcopy *ecp, struct section *s);
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int
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is_remove_section(struct elfcopy *ecp, const char *name)
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{
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/* Always keep section name table */
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if (strcmp(name, ".shstrtab") == 0)
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return 0;
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if (strcmp(name, ".symtab") == 0 ||
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strcmp(name, ".strtab") == 0) {
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if (ecp->strip == STRIP_ALL && lookup_symop_list(
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ecp, NULL, SYMOP_KEEP) == NULL)
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return (1);
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else
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return (0);
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}
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if (is_debug_section(name)) {
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if (ecp->strip == STRIP_ALL ||
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ecp->strip == STRIP_DEBUG ||
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ecp->strip == STRIP_UNNEEDED ||
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(ecp->flags & DISCARD_LOCAL))
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return (1);
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if (ecp->strip == STRIP_NONDEBUG)
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return (0);
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}
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if ((ecp->flags & SEC_REMOVE) || (ecp->flags & SEC_COPY)) {
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struct sec_action *sac;
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sac = lookup_sec_act(ecp, name, 0);
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if ((ecp->flags & SEC_REMOVE) && sac != NULL && sac->remove)
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return (1);
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if ((ecp->flags & SEC_COPY) && (sac == NULL || !sac->copy))
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return (1);
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}
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return (0);
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}
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/*
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* Relocation section needs to be removed if the section it applies to
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* will be removed.
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*/
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int
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is_remove_reloc_sec(struct elfcopy *ecp, uint32_t sh_info)
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{
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const char *name;
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GElf_Shdr ish;
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Elf_Scn *is;
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size_t indx;
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int elferr;
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if (elf_getshstrndx(ecp->ein, &indx) == 0)
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errx(EXIT_FAILURE, "elf_getshstrndx failed: %s",
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elf_errmsg(-1));
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is = NULL;
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while ((is = elf_nextscn(ecp->ein, is)) != NULL) {
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if (sh_info == elf_ndxscn(is)) {
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if (gelf_getshdr(is, &ish) == NULL)
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errx(EXIT_FAILURE, "gelf_getshdr failed: %s",
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elf_errmsg(-1));
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if ((name = elf_strptr(ecp->ein, indx, ish.sh_name)) ==
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NULL)
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errx(EXIT_FAILURE, "elf_strptr failed: %s",
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elf_errmsg(-1));
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if (is_remove_section(ecp, name))
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return (1);
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else
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return (0);
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}
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}
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elferr = elf_errno();
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if (elferr != 0)
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errx(EXIT_FAILURE, "elf_nextscn failed: %s",
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elf_errmsg(elferr));
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/* Remove reloc section if we can't find the target section. */
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return (1);
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}
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static int
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is_append_section(struct elfcopy *ecp, const char *name)
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{
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struct sec_action *sac;
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sac = lookup_sec_act(ecp, name, 0);
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if (sac != NULL && sac->append != 0 && sac->string != NULL)
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return (1);
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return (0);
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}
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static int
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is_compress_section(struct elfcopy *ecp, const char *name)
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{
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struct sec_action *sac;
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sac = lookup_sec_act(ecp, name, 0);
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if (sac != NULL && sac->compress != 0)
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return (1);
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return (0);
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}
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static void
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check_section_rename(struct elfcopy *ecp, struct section *s)
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{
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struct sec_action *sac;
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char *prefix;
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size_t namelen;
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if (s->pseudo)
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return;
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sac = lookup_sec_act(ecp, s->name, 0);
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if (sac != NULL && sac->rename)
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s->name = sac->newname;
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if (!strcmp(s->name, ".symtab") ||
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!strcmp(s->name, ".strtab") ||
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!strcmp(s->name, ".shstrtab"))
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return;
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prefix = NULL;
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if (s->loadable && ecp->prefix_alloc != NULL)
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prefix = ecp->prefix_alloc;
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else if (ecp->prefix_sec != NULL)
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prefix = ecp->prefix_sec;
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if (prefix != NULL) {
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namelen = strlen(s->name) + strlen(prefix) + 1;
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if ((s->newname = malloc(namelen)) == NULL)
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err(EXIT_FAILURE, "malloc failed");
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snprintf(s->newname, namelen, "%s%s", prefix, s->name);
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s->name = s->newname;
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}
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}
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static int
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get_section_flags(struct elfcopy *ecp, const char *name)
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{
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struct sec_action *sac;
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sac = lookup_sec_act(ecp, name, 0);
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if (sac != NULL && sac->flags)
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return sac->flags;
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return (0);
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}
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/*
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* Determine whether the section are debugging section.
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* According to libbfd, debugging sections are recognized
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* only by name.
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*/
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static int
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is_debug_section(const char *name)
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{
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const char *dbg_sec[] = {
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".debug",
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".gnu.linkonce.wi.",
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".line",
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".stab",
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NULL
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};
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const char **p;
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for(p = dbg_sec; *p; p++) {
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if (strncmp(name, *p, strlen(*p)) == 0)
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return (1);
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}
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return (0);
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}
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static int
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is_print_section(struct elfcopy *ecp, const char *name)
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{
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struct sec_action *sac;
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sac = lookup_sec_act(ecp, name, 0);
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if (sac != NULL && sac->print != 0)
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return (1);
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return (0);
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}
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static int
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is_modify_section(struct elfcopy *ecp, const char *name)
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{
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if (is_append_section(ecp, name) ||
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is_compress_section(ecp, name))
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return (1);
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return (0);
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}
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struct sec_action*
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lookup_sec_act(struct elfcopy *ecp, const char *name, int add)
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{
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struct sec_action *sac;
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if (name == NULL)
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return NULL;
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STAILQ_FOREACH(sac, &ecp->v_sac, sac_list) {
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if (strcmp(name, sac->name) == 0)
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return sac;
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}
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if (add == 0)
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return NULL;
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if ((sac = malloc(sizeof(*sac))) == NULL)
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errx(EXIT_FAILURE, "not enough memory");
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memset(sac, 0, sizeof(*sac));
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sac->name = name;
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STAILQ_INSERT_TAIL(&ecp->v_sac, sac, sac_list);
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return (sac);
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}
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void
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free_sec_act(struct elfcopy *ecp)
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{
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struct sec_action *sac, *sac_temp;
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STAILQ_FOREACH_SAFE(sac, &ecp->v_sac, sac_list, sac_temp) {
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STAILQ_REMOVE(&ecp->v_sac, sac, sec_action, sac_list);
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free(sac);
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}
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}
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void
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insert_to_sec_list(struct elfcopy *ecp, struct section *sec, int tail)
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{
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struct section *s;
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if (!tail) {
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TAILQ_FOREACH(s, &ecp->v_sec, sec_list) {
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if (sec->off < s->off) {
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TAILQ_INSERT_BEFORE(s, sec, sec_list);
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goto inc_nos;
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}
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}
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}
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TAILQ_INSERT_TAIL(&ecp->v_sec, sec, sec_list);
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inc_nos:
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if (sec->pseudo == 0)
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ecp->nos++;
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}
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/*
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* First step of section creation: create scn and internal section
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* structure, discard sections to be removed.
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*/
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void
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create_scn(struct elfcopy *ecp)
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{
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struct section *s;
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const char *name;
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Elf_Scn *is;
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GElf_Shdr ish;
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size_t indx;
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uint64_t oldndx, newndx;
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int elferr, sec_flags;
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/*
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* Insert a pseudo section that contains the ELF header
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* and program header. Used as reference for section offset
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* or load address adjustment.
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*/
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if ((s = calloc(1, sizeof(*s))) == NULL)
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err(EXIT_FAILURE, "calloc failed");
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s->off = 0;
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s->sz = gelf_fsize(ecp->eout, ELF_T_EHDR, 1, EV_CURRENT) +
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gelf_fsize(ecp->eout, ELF_T_PHDR, ecp->ophnum, EV_CURRENT);
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s->align = 1;
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s->pseudo = 1;
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s->loadable = add_to_inseg_list(ecp, s);
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insert_to_sec_list(ecp, s, 0);
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/* Create internal .shstrtab section. */
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init_shstrtab(ecp);
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if (elf_getshstrndx(ecp->ein, &indx) == 0)
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errx(EXIT_FAILURE, "elf_getshstrndx failed: %s",
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elf_errmsg(-1));
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is = NULL;
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while ((is = elf_nextscn(ecp->ein, is)) != NULL) {
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if (gelf_getshdr(is, &ish) == NULL)
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errx(EXIT_FAILURE, "219 gelf_getshdr failed: %s",
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elf_errmsg(-1));
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if ((name = elf_strptr(ecp->ein, indx, ish.sh_name)) == NULL)
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errx(EXIT_FAILURE, "elf_strptr failed: %s",
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elf_errmsg(-1));
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/* Skip sections to be removed. */
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if (is_remove_section(ecp, name))
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continue;
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/*
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* Relocation section need to be remove if the section
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* it applies will be removed.
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*/
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if (ish.sh_type == SHT_REL || ish.sh_type == SHT_RELA)
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if (ish.sh_info != 0 &&
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is_remove_reloc_sec(ecp, ish.sh_info))
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continue;
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/*
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* Section groups should be removed if symbol table will
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* be removed. (section group's signature stored in symbol
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* table)
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*/
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if (ish.sh_type == SHT_GROUP && ecp->strip == STRIP_ALL)
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continue;
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/* Get section flags set by user. */
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sec_flags = get_section_flags(ecp, name);
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/* Create internal section object. */
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if (strcmp(name, ".shstrtab") != 0) {
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if ((s = calloc(1, sizeof(*s))) == NULL)
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err(EXIT_FAILURE, "calloc failed");
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s->name = name;
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s->is = is;
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s->off = ish.sh_offset;
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s->sz = ish.sh_size;
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s->align = ish.sh_addralign;
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s->type = ish.sh_type;
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s->vma = ish.sh_addr;
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/*
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* Search program headers to determine whether section
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* is loadable, but if user explicitly set section flags
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* while neither "load" nor "alloc" is set, we make the
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* section unloadable.
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*/
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if (sec_flags &&
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(sec_flags & (SF_LOAD | SF_ALLOC)) == 0)
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s->loadable = 0;
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else
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s->loadable = add_to_inseg_list(ecp, s);
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} else {
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/* Assuming .shstrtab is "unloadable". */
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s = ecp->shstrtab;
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s->off = ish.sh_offset;
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}
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oldndx = newndx = SHN_UNDEF;
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if (strcmp(name, ".symtab") != 0 &&
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strcmp(name, ".strtab") != 0) {
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if (!strcmp(name, ".shstrtab")) {
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/*
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* Add sections specified by --add-section and
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* gnu debuglink. we want these sections have
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* smaller index than .shstrtab section.
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*/
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if (ecp->debuglink != NULL)
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add_gnu_debuglink(ecp);
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if (ecp->flags & SEC_ADD)
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insert_sections(ecp);
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}
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if ((s->os = elf_newscn(ecp->eout)) == NULL)
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errx(EXIT_FAILURE, "elf_newscn failed: %s",
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elf_errmsg(-1));
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if ((newndx = elf_ndxscn(s->os)) == SHN_UNDEF)
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errx(EXIT_FAILURE, "elf_ndxscn failed: %s",
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elf_errmsg(-1));
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}
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if ((oldndx = elf_ndxscn(is)) == SHN_UNDEF)
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errx(EXIT_FAILURE, "elf_ndxscn failed: %s",
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elf_errmsg(-1));
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if (oldndx != SHN_UNDEF && newndx != SHN_UNDEF)
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ecp->secndx[oldndx] = newndx;
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/*
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* If strip action is STRIP_NONDEBUG(only keep debug),
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* change sections flags of loadable sections to SHF_NOBITS,
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* and the content of those sections will be ignored.
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*/
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if (ecp->strip == STRIP_NONDEBUG && (ish.sh_flags & SHF_ALLOC))
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s->type = SHT_NOBITS;
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check_section_rename(ecp, s);
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|
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/* create section header based on input object. */
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if (strcmp(name, ".symtab") != 0 &&
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strcmp(name, ".strtab") != 0 &&
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strcmp(name, ".shstrtab") != 0)
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copy_shdr(ecp, s, NULL, 0, sec_flags);
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|
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if (strcmp(name, ".symtab") == 0) {
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ecp->flags |= SYMTAB_EXIST;
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ecp->symtab = s;
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}
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if (strcmp(name, ".strtab") == 0)
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ecp->strtab = s;
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insert_to_sec_list(ecp, s, 0);
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}
|
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elferr = elf_errno();
|
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if (elferr != 0)
|
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errx(EXIT_FAILURE, "elf_nextscn failed: %s",
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elf_errmsg(elferr));
|
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}
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|
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struct section *
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insert_shtab(struct elfcopy *ecp, int tail)
|
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{
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struct section *s, *shtab;
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GElf_Ehdr ieh;
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int nsecs;
|
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|
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/*
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* Treat section header table as a "pseudo" section, insert it
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* into section list, so later it will get sorted and resynced
|
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* just as normal sections.
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*/
|
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if ((shtab = calloc(1, sizeof(*shtab))) == NULL)
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errx(EXIT_FAILURE, "calloc failed");
|
|
if (!tail) {
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/*
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* "shoff" of input object is used as a hint for section
|
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* resync later.
|
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*/
|
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if (gelf_getehdr(ecp->ein, &ieh) == NULL)
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errx(EXIT_FAILURE, "gelf_getehdr() failed: %s",
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elf_errmsg(-1));
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shtab->off = ieh.e_shoff;
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} else
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shtab->off = 0;
|
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/* Calculate number of sections in the output object. */
|
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nsecs = 0;
|
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TAILQ_FOREACH(s, &ecp->v_sec, sec_list) {
|
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if (!s->pseudo)
|
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nsecs++;
|
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}
|
|
/* Remember there is always a null section, so we +1 here. */
|
|
shtab->sz = gelf_fsize(ecp->eout, ELF_T_SHDR, nsecs + 1, EV_CURRENT);
|
|
if (shtab->sz == 0)
|
|
errx(EXIT_FAILURE, "gelf_fsize() failed: %s", elf_errmsg(-1));
|
|
shtab->align = (ecp->oec == ELFCLASS32 ? 4 : 8);
|
|
shtab->loadable = 0;
|
|
shtab->pseudo = 1;
|
|
insert_to_sec_list(ecp, shtab, tail);
|
|
|
|
return (shtab);
|
|
}
|
|
|
|
void
|
|
copy_content(struct elfcopy *ecp)
|
|
{
|
|
struct section *s;
|
|
|
|
TAILQ_FOREACH(s, &ecp->v_sec, sec_list) {
|
|
/* Skip pseudo section. */
|
|
if (s->pseudo)
|
|
continue;
|
|
|
|
/* Skip special sections. */
|
|
if (strcmp(s->name, ".symtab") == 0 ||
|
|
strcmp(s->name, ".strtab") == 0 ||
|
|
strcmp(s->name, ".shstrtab") == 0)
|
|
continue;
|
|
|
|
/*
|
|
* If strip action is STRIP_ALL, relocation info need
|
|
* to be stripped. Skip filtering otherwisw.
|
|
*/
|
|
if (ecp->strip == STRIP_ALL &&
|
|
(s->type == SHT_REL || s->type == SHT_RELA))
|
|
filter_reloc(ecp, s);
|
|
|
|
if (is_modify_section(ecp, s->name))
|
|
modify_section(ecp, s);
|
|
|
|
copy_data(s);
|
|
|
|
/*
|
|
* If symbol table is modified, relocation info might
|
|
* need update, as symbol index may have changed.
|
|
*/
|
|
if ((ecp->flags & SYMTAB_INTACT) == 0 &&
|
|
(ecp->flags & SYMTAB_EXIST) &&
|
|
(s->type == SHT_REL || s->type == SHT_RELA))
|
|
update_reloc(ecp, s);
|
|
|
|
if (is_print_section(ecp, s->name))
|
|
print_section(s);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Filter relocation entries, only keep those entries whose
|
|
* symbol is in the keep list.
|
|
*/
|
|
static void
|
|
filter_reloc(struct elfcopy *ecp, struct section *s)
|
|
{
|
|
const char *name;
|
|
GElf_Shdr ish;
|
|
GElf_Rel rel;
|
|
GElf_Rela rela;
|
|
Elf32_Rel *rel32;
|
|
Elf64_Rel *rel64;
|
|
Elf32_Rela *rela32;
|
|
Elf64_Rela *rela64;
|
|
Elf_Data *id;
|
|
uint64_t cap, n, nrels;
|
|
int elferr, i;
|
|
|
|
if (gelf_getshdr(s->is, &ish) == NULL)
|
|
errx(EXIT_FAILURE, "gelf_getehdr() failed: %s",
|
|
elf_errmsg(-1));
|
|
|
|
/* We don't want to touch relocation info for dynamic symbols. */
|
|
if ((ecp->flags & SYMTAB_EXIST) == 0) {
|
|
if (ish.sh_link == 0 || ecp->secndx[ish.sh_link] == 0) {
|
|
/*
|
|
* This reloc section applies to the symbol table
|
|
* that was stripped, so discard whole section.
|
|
*/
|
|
s->nocopy = 1;
|
|
s->sz = 0;
|
|
}
|
|
return;
|
|
} else {
|
|
/* Symbol table exist, check if index equals. */
|
|
if (ish.sh_link != elf_ndxscn(ecp->symtab->is))
|
|
return;
|
|
}
|
|
|
|
#define COPYREL(REL, SZ) do { \
|
|
if (nrels == 0) { \
|
|
if ((REL##SZ = malloc(cap * \
|
|
sizeof(Elf##SZ##_Rel))) == NULL) \
|
|
err(EXIT_FAILURE, "malloc failed"); \
|
|
} \
|
|
if (nrels >= cap) { \
|
|
cap *= 2; \
|
|
if ((REL##SZ = realloc(REL##SZ, cap * \
|
|
sizeof(Elf##SZ##_Rel))) == NULL) \
|
|
err(EXIT_FAILURE, "realloc failed"); \
|
|
} \
|
|
REL##SZ[nrels].r_offset = REL.r_offset; \
|
|
REL##SZ[nrels].r_info = REL.r_info; \
|
|
if (s->type == SHT_RELA) \
|
|
rela##SZ[nrels].r_addend = rela.r_addend; \
|
|
nrels++; \
|
|
} while (0)
|
|
|
|
nrels = 0;
|
|
cap = 4; /* keep list is usually small. */
|
|
rel32 = NULL;
|
|
rel64 = NULL;
|
|
rela32 = NULL;
|
|
rela64 = NULL;
|
|
if ((id = elf_getdata(s->is, NULL)) == NULL)
|
|
errx(EXIT_FAILURE, "elf_getdata() failed: %s",
|
|
elf_errmsg(-1));
|
|
n = ish.sh_size / ish.sh_entsize;
|
|
for(i = 0; (uint64_t)i < n; i++) {
|
|
if (s->type == SHT_REL) {
|
|
if (gelf_getrel(id, i, &rel) != &rel)
|
|
errx(EXIT_FAILURE, "gelf_getrel failed: %s",
|
|
elf_errmsg(-1));
|
|
} else {
|
|
if (gelf_getrela(id, i, &rela) != &rela)
|
|
errx(EXIT_FAILURE, "gelf_getrel failed: %s",
|
|
elf_errmsg(-1));
|
|
}
|
|
name = elf_strptr(ecp->ein, elf_ndxscn(ecp->strtab->is),
|
|
GELF_R_SYM(rel.r_info));
|
|
if (name == NULL)
|
|
errx(EXIT_FAILURE, "elf_strptr failed: %s",
|
|
elf_errmsg(-1));
|
|
if (lookup_symop_list(ecp, name, SYMOP_KEEP) != NULL) {
|
|
if (ecp->oec == ELFCLASS32) {
|
|
if (s->type == SHT_REL)
|
|
COPYREL(rel, 32);
|
|
else
|
|
COPYREL(rela, 32);
|
|
} else {
|
|
if (s->type == SHT_REL)
|
|
COPYREL(rel, 64);
|
|
else
|
|
COPYREL(rela, 64);
|
|
}
|
|
}
|
|
}
|
|
elferr = elf_errno();
|
|
if (elferr != 0)
|
|
errx(EXIT_FAILURE, "elf_getdata() failed: %s",
|
|
elf_errmsg(elferr));
|
|
|
|
if (ecp->oec == ELFCLASS32) {
|
|
if (s->type == SHT_REL)
|
|
s->buf = rel32;
|
|
else
|
|
s->buf = rela32;
|
|
} else {
|
|
if (s->type == SHT_REL)
|
|
s->buf = rel64;
|
|
else
|
|
s->buf = rela64;
|
|
}
|
|
s->sz = gelf_fsize(ecp->eout, (s->type == SHT_REL ? ELF_T_REL :
|
|
ELF_T_RELA), nrels, EV_CURRENT);
|
|
s->nocopy = 1;
|
|
}
|
|
|
|
static void
|
|
update_reloc(struct elfcopy *ecp, struct section *s)
|
|
{
|
|
GElf_Shdr osh;
|
|
GElf_Rel rel;
|
|
GElf_Rela rela;
|
|
Elf_Data *od;
|
|
uint64_t n;
|
|
int i;
|
|
|
|
#define UPDATEREL(REL) do { \
|
|
if (gelf_get##REL(od, i, &REL) != &REL) \
|
|
errx(EXIT_FAILURE, "gelf_get##REL failed: %s", \
|
|
elf_errmsg(-1)); \
|
|
REL.r_info = GELF_R_INFO(ecp->symndx[GELF_R_SYM(REL.r_info)], \
|
|
GELF_R_TYPE(REL.r_info)); \
|
|
if (!gelf_update_##REL(od, i, &REL)) \
|
|
errx(EXIT_FAILURE, "gelf_update_##REL failed: %s", \
|
|
elf_errmsg(-1)); \
|
|
} while(0)
|
|
|
|
if (s->sz == 0)
|
|
return;
|
|
if (gelf_getshdr(s->os, &osh) == NULL)
|
|
errx(EXIT_FAILURE, "gelf_getehdr() failed: %s",
|
|
elf_errmsg(-1));
|
|
/* Only process .symtab reloc info. */
|
|
if (osh.sh_link != elf_ndxscn(ecp->symtab->is))
|
|
return;
|
|
if ((od = elf_getdata(s->os, NULL)) == NULL)
|
|
errx(EXIT_FAILURE, "elf_getdata() failed: %s",
|
|
elf_errmsg(-1));
|
|
n = osh.sh_size / osh.sh_entsize;
|
|
for(i = 0; (uint64_t)i < n; i++) {
|
|
if (s->type == SHT_REL)
|
|
UPDATEREL(rel);
|
|
else
|
|
UPDATEREL(rela);
|
|
}
|
|
}
|
|
|
|
static void
|
|
pad_section(struct elfcopy *ecp, struct section *s)
|
|
{
|
|
GElf_Shdr osh;
|
|
Elf_Data *od;
|
|
|
|
if (s == NULL || s->pad_sz == 0)
|
|
return;
|
|
|
|
if ((s->pad = malloc(s->pad_sz)) == NULL)
|
|
err(EXIT_FAILURE, "malloc failed");
|
|
memset(s->pad, ecp->fill, s->pad_sz);
|
|
|
|
/* Create a new Elf_Data to contain the padding bytes. */
|
|
if ((od = elf_newdata(s->os)) == NULL)
|
|
errx(EXIT_FAILURE, "elf_newdata() failed: %s",
|
|
elf_errmsg(-1));
|
|
od->d_align = 1;
|
|
od->d_off = s->sz;
|
|
od->d_buf = s->pad;
|
|
od->d_type = ELF_T_BYTE;
|
|
od->d_size = s->pad_sz;
|
|
od->d_version = EV_CURRENT;
|
|
|
|
/* Update section header. */
|
|
if (gelf_getshdr(s->os, &osh) == NULL)
|
|
errx(EXIT_FAILURE, "gelf_getshdr() failed: %s",
|
|
elf_errmsg(-1));
|
|
osh.sh_size = s->sz + s->pad_sz;
|
|
if (!gelf_update_shdr(s->os, &osh))
|
|
errx(EXIT_FAILURE, "elf_update_shdr failed: %s",
|
|
elf_errmsg(-1));
|
|
}
|
|
|
|
void
|
|
resync_sections(struct elfcopy *ecp)
|
|
{
|
|
struct section *s, *ps;
|
|
GElf_Shdr osh;
|
|
uint64_t off;
|
|
int first;
|
|
|
|
ps = NULL;
|
|
first = 1;
|
|
off = 0;
|
|
TAILQ_FOREACH(s, &ecp->v_sec, sec_list) {
|
|
if (first) {
|
|
off = s->off;
|
|
first = 0;
|
|
}
|
|
|
|
/*
|
|
* Ignore TLS sections with load address 0 and without
|
|
* content. We don't need to adjust their file offset or
|
|
* VMA, only the size matters.
|
|
*/
|
|
if (s->seg_tls != NULL && s->type == SHT_NOBITS &&
|
|
s->off == 0)
|
|
continue;
|
|
|
|
/* Align section offset. */
|
|
if (s->align == 0)
|
|
s->align = 1;
|
|
if (off <= s->off) {
|
|
if (!s->loadable)
|
|
s->off = roundup(off, s->align);
|
|
} else {
|
|
if (s->loadable)
|
|
warnx("moving loadable section %s, "
|
|
"is this intentional?", s->name);
|
|
s->off = roundup(off, s->align);
|
|
}
|
|
|
|
/* Calculate next section offset. */
|
|
off = s->off;
|
|
if (s->pseudo || (s->type != SHT_NOBITS && s->type != SHT_NULL))
|
|
off += s->sz;
|
|
|
|
if (s->pseudo) {
|
|
ps = NULL;
|
|
continue;
|
|
}
|
|
|
|
/* Count padding bytes added through --pad-to. */
|
|
if (s->pad_sz > 0)
|
|
off += s->pad_sz;
|
|
|
|
/* Update section header accordingly. */
|
|
if (gelf_getshdr(s->os, &osh) == NULL)
|
|
errx(EXIT_FAILURE, "gelf_getshdr() failed: %s",
|
|
elf_errmsg(-1));
|
|
osh.sh_addr = s->vma;
|
|
osh.sh_offset = s->off;
|
|
osh.sh_size = s->sz;
|
|
if (!gelf_update_shdr(s->os, &osh))
|
|
errx(EXIT_FAILURE, "elf_update_shdr failed: %s",
|
|
elf_errmsg(-1));
|
|
|
|
/* Add padding for previous section, if need. */
|
|
if (ps != NULL) {
|
|
if (ps->pad_sz > 0) {
|
|
/* Apply padding added by --pad-to. */
|
|
pad_section(ecp, ps);
|
|
} else if ((ecp->flags & GAP_FILL) &&
|
|
(ps->off + ps->sz < s->off)) {
|
|
/*
|
|
* Fill the gap between sections by padding
|
|
* the section with lower address.
|
|
*/
|
|
ps->pad_sz = s->off - (ps->off + ps->sz);
|
|
pad_section(ecp, ps);
|
|
}
|
|
}
|
|
|
|
ps = s;
|
|
}
|
|
|
|
/* Pad the last section, if need. */
|
|
if (ps != NULL && ps->pad_sz > 0)
|
|
pad_section(ecp, ps);
|
|
}
|
|
|
|
static void
|
|
modify_section(struct elfcopy *ecp, struct section *s)
|
|
{
|
|
struct sec_action *sac;
|
|
size_t srcsz, dstsz, p, len;
|
|
char *b, *c, *d, *src, *end;
|
|
int dupe;
|
|
|
|
src = read_section(s, &srcsz);
|
|
if (src == NULL || srcsz == 0) {
|
|
/* For empty section, we proceed if we need to append. */
|
|
if (!is_append_section(ecp, s->name))
|
|
return;
|
|
}
|
|
|
|
/* Allocate buffer needed for new section data. */
|
|
dstsz = srcsz;
|
|
if (is_append_section(ecp, s->name)) {
|
|
sac = lookup_sec_act(ecp, s->name, 0);
|
|
dstsz += strlen(sac->string) + 1;
|
|
}
|
|
if ((b = malloc(dstsz)) == NULL)
|
|
err(EXIT_FAILURE, "malloc failed");
|
|
s->buf = b;
|
|
|
|
/* Compress section. */
|
|
p = 0;
|
|
if (is_compress_section(ecp, s->name)) {
|
|
end = src + srcsz;
|
|
for(c = src; c < end;) {
|
|
len = 0;
|
|
while(c + len < end && c[len] != '\0')
|
|
len++;
|
|
if (c + len == end) {
|
|
/* XXX should we warn here? */
|
|
strncpy(&b[p], c, len);
|
|
p += len;
|
|
break;
|
|
}
|
|
dupe = 0;
|
|
for (d = b; d < b + p; ) {
|
|
if (strcmp(d, c) == 0) {
|
|
dupe = 1;
|
|
break;
|
|
}
|
|
d += strlen(d) + 1;
|
|
}
|
|
if (!dupe) {
|
|
strncpy(&b[p], c, len);
|
|
b[p + len] = '\0';
|
|
p += len + 1;
|
|
}
|
|
c += len + 1;
|
|
}
|
|
} else {
|
|
memcpy(b, src, srcsz);
|
|
p += srcsz;
|
|
}
|
|
|
|
/* Append section. */
|
|
if (is_append_section(ecp, s->name)) {
|
|
sac = lookup_sec_act(ecp, s->name, 0);
|
|
len = strlen(sac->string);
|
|
strncpy(&b[p], sac->string, len);
|
|
b[p + len] = '\0';
|
|
p += len + 1;
|
|
}
|
|
|
|
s->sz = p;
|
|
s->nocopy = 1;
|
|
}
|
|
|
|
static void
|
|
print_data(const char *d, size_t sz)
|
|
{
|
|
const char *c;
|
|
|
|
for (c = d; c < d + sz; c++) {
|
|
if (*c == '\0')
|
|
putchar('\n');
|
|
else
|
|
putchar(*c);
|
|
}
|
|
}
|
|
|
|
static void
|
|
print_section(struct section *s)
|
|
{
|
|
Elf_Data *id;
|
|
int elferr;
|
|
|
|
if (s->buf != NULL && s->sz > 0) {
|
|
print_data(s->buf, s->sz);
|
|
} else {
|
|
id = NULL;
|
|
while ((id = elf_getdata(s->is, id)) != NULL)
|
|
print_data(id->d_buf, id->d_size);
|
|
elferr = elf_errno();
|
|
if (elferr != 0)
|
|
errx(EXIT_FAILURE, "elf_getdata() failed: %s",
|
|
elf_errmsg(elferr));
|
|
}
|
|
putchar('\n');
|
|
}
|
|
|
|
static void *
|
|
read_section(struct section *s, size_t *size)
|
|
{
|
|
Elf_Data *id;
|
|
char *b;
|
|
size_t sz;
|
|
int elferr;
|
|
|
|
sz = 0;
|
|
b = NULL;
|
|
id = NULL;
|
|
while ((id = elf_getdata(s->is, id)) != NULL) {
|
|
if (b == NULL)
|
|
b = malloc(id->d_size);
|
|
else
|
|
b = malloc(sz + id->d_size);
|
|
if (b == NULL)
|
|
err(EXIT_FAILURE, "malloc or realloc failed");
|
|
|
|
memcpy(&b[sz], id->d_buf, id->d_size);
|
|
sz += id->d_size;
|
|
}
|
|
elferr = elf_errno();
|
|
if (elferr != 0)
|
|
errx(EXIT_FAILURE, "elf_getdata() failed: %s",
|
|
elf_errmsg(elferr));
|
|
|
|
*size = sz;
|
|
|
|
return (b);
|
|
}
|
|
|
|
void
|
|
copy_shdr(struct elfcopy *ecp, struct section *s, const char *name, int copy,
|
|
int sec_flags)
|
|
{
|
|
GElf_Shdr ish, osh;
|
|
|
|
if (gelf_getshdr(s->is, &ish) == NULL)
|
|
errx(EXIT_FAILURE, "526 gelf_getshdr() failed: %s",
|
|
elf_errmsg(-1));
|
|
if (gelf_getshdr(s->os, &osh) == NULL)
|
|
errx(EXIT_FAILURE, "529 gelf_getshdr() failed: %s",
|
|
elf_errmsg(-1));
|
|
|
|
if (copy)
|
|
(void) memcpy(&osh, &ish, sizeof(ish));
|
|
else {
|
|
osh.sh_type = s->type;
|
|
osh.sh_addr = s->vma;
|
|
osh.sh_offset = s->off;
|
|
osh.sh_size = s->sz;
|
|
osh.sh_link = ish.sh_link;
|
|
osh.sh_info = ish.sh_info;
|
|
osh.sh_addralign = s->align;
|
|
osh.sh_entsize = ish.sh_entsize;
|
|
|
|
if (sec_flags) {
|
|
osh.sh_flags = 0;
|
|
if (sec_flags & SF_ALLOC) {
|
|
osh.sh_flags |= SHF_ALLOC;
|
|
if (!s->loadable)
|
|
warnx("set SHF_ALLOC flag for "
|
|
"unloadable section %s",
|
|
s->name);
|
|
}
|
|
if ((sec_flags & SF_READONLY) == 0)
|
|
osh.sh_flags |= SHF_WRITE;
|
|
if (sec_flags & SF_CODE)
|
|
osh.sh_flags |= SHF_EXECINSTR;
|
|
} else
|
|
osh.sh_flags = ish.sh_flags;
|
|
}
|
|
|
|
if (name == NULL)
|
|
add_to_shstrtab(ecp, s->name);
|
|
else
|
|
add_to_shstrtab(ecp, name);
|
|
|
|
if (!gelf_update_shdr(s->os, &osh))
|
|
errx(EXIT_FAILURE, "elf_update_shdr failed: %s",
|
|
elf_errmsg(-1));
|
|
}
|
|
|
|
void
|
|
copy_data(struct section *s)
|
|
{
|
|
Elf_Data *id, *od;
|
|
int elferr;
|
|
|
|
if (s->nocopy && s->buf == NULL)
|
|
return;
|
|
|
|
if ((id = elf_getdata(s->is, NULL)) == NULL) {
|
|
elferr = elf_errno();
|
|
if (elferr != 0)
|
|
errx(EXIT_FAILURE, "elf_getdata() failed: %s",
|
|
elf_errmsg(elferr));
|
|
return;
|
|
}
|
|
|
|
if ((od = elf_newdata(s->os)) == NULL)
|
|
errx(EXIT_FAILURE, "elf_newdata() failed: %s",
|
|
elf_errmsg(-1));
|
|
|
|
if (s->nocopy) {
|
|
/* Use s->buf as content if s->nocopy is set. */
|
|
od->d_align = id->d_align;
|
|
od->d_off = 0;
|
|
od->d_buf = s->buf;
|
|
od->d_type = id->d_type;
|
|
od->d_size = s->sz;
|
|
od->d_version = id->d_version;
|
|
} else {
|
|
od->d_align = id->d_align;
|
|
od->d_off = id->d_off;
|
|
od->d_buf = id->d_buf;
|
|
od->d_type = id->d_type;
|
|
od->d_size = id->d_size;
|
|
od->d_version = id->d_version;
|
|
}
|
|
|
|
/*
|
|
* Alignment Fixup. libelf does not allow the alignment for
|
|
* Elf_Data descriptor to be set to 0. In this case we workaround
|
|
* it by setting the alignment to 1.
|
|
*
|
|
* According to the ELF ABI, alignment 0 and 1 has the same
|
|
* meaning: the section has no alignment constraints.
|
|
*/
|
|
if (od->d_align == 0)
|
|
od->d_align = 1;
|
|
}
|
|
|
|
struct section *
|
|
create_external_section(struct elfcopy *ecp, const char *name, char *newname,
|
|
void *buf, uint64_t size, uint64_t off, uint64_t stype, Elf_Type dtype,
|
|
uint64_t flags, uint64_t align, uint64_t vma, int loadable)
|
|
{
|
|
struct section *s;
|
|
Elf_Scn *os;
|
|
Elf_Data *od;
|
|
GElf_Shdr osh;
|
|
|
|
if ((os = elf_newscn(ecp->eout)) == NULL)
|
|
errx(EXIT_FAILURE, "elf_newscn() failed: %s",
|
|
elf_errmsg(-1));
|
|
if ((s = calloc(1, sizeof(*s))) == NULL)
|
|
err(EXIT_FAILURE, "calloc failed");
|
|
s->name = name;
|
|
s->newname = newname; /* needs to be free()'ed */
|
|
s->off = off;
|
|
s->sz = size;
|
|
s->vma = vma;
|
|
s->align = align;
|
|
s->loadable = loadable;
|
|
s->is = NULL;
|
|
s->os = os;
|
|
s->type = stype;
|
|
s->nocopy = 1;
|
|
insert_to_sec_list(ecp, s, 1);
|
|
|
|
if (gelf_getshdr(os, &osh) == NULL)
|
|
errx(EXIT_FAILURE, "gelf_getshdr() failed: %s",
|
|
elf_errmsg(-1));
|
|
osh.sh_flags = flags;
|
|
osh.sh_type = s->type;
|
|
osh.sh_addr = s->vma;
|
|
osh.sh_addralign = s->align;
|
|
if (!gelf_update_shdr(os, &osh))
|
|
errx(EXIT_FAILURE, "gelf_update_shdr() failed: %s",
|
|
elf_errmsg(-1));
|
|
add_to_shstrtab(ecp, name);
|
|
|
|
if (buf != NULL && size != 0) {
|
|
if ((od = elf_newdata(os)) == NULL)
|
|
errx(EXIT_FAILURE, "elf_newdata() failed: %s",
|
|
elf_errmsg(-1));
|
|
od->d_align = align;
|
|
od->d_off = 0;
|
|
od->d_buf = buf;
|
|
od->d_size = size;
|
|
od->d_type = dtype;
|
|
od->d_version = EV_CURRENT;
|
|
}
|
|
|
|
/*
|
|
* Clear SYMTAB_INTACT, as we probably need to update/add new
|
|
* STT_SECTION symbols into the symbol table.
|
|
*/
|
|
ecp->flags &= ~SYMTAB_INTACT;
|
|
|
|
return (s);
|
|
}
|
|
|
|
/*
|
|
* Insert sections specified by --add-section to the end of section list.
|
|
*/
|
|
static void
|
|
insert_sections(struct elfcopy *ecp)
|
|
{
|
|
struct sec_add *sa;
|
|
struct section *s;
|
|
size_t off;
|
|
|
|
/* Put these sections in the end of current list. */
|
|
off = 0;
|
|
TAILQ_FOREACH(s, &ecp->v_sec, sec_list) {
|
|
if (s->type != SHT_NOBITS && s->type != SHT_NULL)
|
|
off = s->off + s->sz;
|
|
else
|
|
off = s->off;
|
|
}
|
|
|
|
STAILQ_FOREACH(sa, &ecp->v_sadd, sadd_list) {
|
|
|
|
/* TODO: Add section header vma/lma, flag changes here */
|
|
|
|
(void) create_external_section(ecp, sa->name, NULL, sa->content,
|
|
sa->size, off, SHT_PROGBITS, ELF_T_BYTE, 0, 1, 0, 0);
|
|
}
|
|
}
|
|
|
|
void
|
|
add_to_shstrtab(struct elfcopy *ecp, const char *name)
|
|
{
|
|
struct section *s;
|
|
|
|
s = ecp->shstrtab;
|
|
insert_to_strtab(s, name);
|
|
}
|
|
|
|
void
|
|
update_shdr(struct elfcopy *ecp, int update_link)
|
|
{
|
|
struct section *s;
|
|
GElf_Shdr osh;
|
|
int elferr;
|
|
|
|
TAILQ_FOREACH(s, &ecp->v_sec, sec_list) {
|
|
if (s->pseudo)
|
|
continue;
|
|
|
|
if (gelf_getshdr(s->os, &osh) == NULL)
|
|
errx(EXIT_FAILURE, "668 gelf_getshdr failed: %s",
|
|
elf_errmsg(-1));
|
|
|
|
/* Find section name in string table and set sh_name. */
|
|
osh.sh_name = lookup_string(ecp->shstrtab, s->name);
|
|
|
|
/*
|
|
* sh_link needs to be updated, since the index of the
|
|
* linked section might have changed.
|
|
*/
|
|
if (update_link && osh.sh_link != 0)
|
|
osh.sh_link = ecp->secndx[osh.sh_link];
|
|
|
|
/*
|
|
* sh_info of relocation section links to the section to which
|
|
* its relocation info applies. So it may need update as well.
|
|
*/
|
|
if ((s->type == SHT_REL || s->type == SHT_RELA) &&
|
|
osh.sh_info != 0)
|
|
osh.sh_info = ecp->secndx[osh.sh_info];
|
|
|
|
if (!gelf_update_shdr(s->os, &osh))
|
|
errx(EXIT_FAILURE, "gelf_update_shdr() failed: %s",
|
|
elf_errmsg(-1));
|
|
}
|
|
elferr = elf_errno();
|
|
if (elferr != 0)
|
|
errx(EXIT_FAILURE, "elf_nextscn failed: %s",
|
|
elf_errmsg(elferr));
|
|
}
|
|
|
|
void
|
|
init_shstrtab(struct elfcopy *ecp)
|
|
{
|
|
struct section *s;
|
|
|
|
if ((ecp->shstrtab = calloc(1, sizeof(*ecp->shstrtab))) == NULL)
|
|
err(EXIT_FAILURE, "calloc failed");
|
|
s = ecp->shstrtab;
|
|
s->name = ".shstrtab";
|
|
s->is = NULL;
|
|
s->sz = 0;
|
|
s->align = 1;
|
|
s->loadable = 0;
|
|
s->type = SHT_STRTAB;
|
|
s->vma = 0;
|
|
|
|
insert_to_strtab(s, "");
|
|
insert_to_strtab(s, ".symtab");
|
|
insert_to_strtab(s, ".strtab");
|
|
insert_to_strtab(s, ".shstrtab");
|
|
}
|
|
|
|
void
|
|
set_shstrtab(struct elfcopy *ecp)
|
|
{
|
|
struct section *s;
|
|
Elf_Data *data;
|
|
GElf_Shdr sh;
|
|
|
|
s = ecp->shstrtab;
|
|
|
|
if (gelf_getshdr(s->os, &sh) == NULL)
|
|
errx(EXIT_FAILURE, "692 gelf_getshdr() failed: %s",
|
|
elf_errmsg(-1));
|
|
sh.sh_addr = 0;
|
|
sh.sh_addralign = 1;
|
|
sh.sh_offset = s->off;
|
|
sh.sh_type = SHT_STRTAB;
|
|
sh.sh_flags = 0;
|
|
sh.sh_entsize = 0;
|
|
sh.sh_info = 0;
|
|
sh.sh_link = 0;
|
|
|
|
if ((data = elf_newdata(s->os)) == NULL)
|
|
errx(EXIT_FAILURE, "elf_newdata() failed: %s",
|
|
elf_errmsg(-1));
|
|
|
|
/*
|
|
* If we don't have a symbol table, skip those a few bytes
|
|
* which are reserved for this in the beginning of shstrtab.
|
|
*/
|
|
if (!(ecp->flags & SYMTAB_EXIST)) {
|
|
s->sz -= sizeof(".symtab\0.strtab");
|
|
memmove(s->buf, (char *)s->buf + sizeof(".symtab\0.strtab"),
|
|
s->sz);
|
|
}
|
|
|
|
sh.sh_size = s->sz;
|
|
if (!gelf_update_shdr(s->os, &sh))
|
|
errx(EXIT_FAILURE, "gelf_update_shdr() failed: %s",
|
|
elf_errmsg(-1));
|
|
|
|
data->d_align = 1;
|
|
data->d_buf = s->buf;
|
|
data->d_size = s->sz;
|
|
data->d_off = 0;
|
|
data->d_type = ELF_T_BYTE;
|
|
data->d_version = EV_CURRENT;
|
|
|
|
if (!elf_setshstrndx(ecp->eout, elf_ndxscn(s->os)))
|
|
errx(EXIT_FAILURE, "elf_setshstrndx() failed: %s",
|
|
elf_errmsg(-1));
|
|
}
|
|
|
|
void
|
|
add_section(struct elfcopy *ecp, const char *arg)
|
|
{
|
|
struct sec_add *sa;
|
|
struct stat sb;
|
|
const char *s, *fn;
|
|
FILE *fp;
|
|
int len;
|
|
|
|
if ((s = strchr(arg, '=')) == NULL)
|
|
errx(EXIT_FAILURE,
|
|
"illegal format for --add-section option");
|
|
if ((sa = malloc(sizeof(*sa))) == NULL)
|
|
err(EXIT_FAILURE, "malloc failed");
|
|
|
|
len = s - arg;
|
|
if ((sa->name = malloc(len + 1)) == NULL)
|
|
err(EXIT_FAILURE, "malloc failed");
|
|
strncpy(sa->name, arg, len);
|
|
sa->name[len] = '\0';
|
|
|
|
fn = s + 1;
|
|
if (stat(fn, &sb) == -1)
|
|
err(EXIT_FAILURE, "stat failed");
|
|
sa->size = sb.st_size;
|
|
if ((sa->content = malloc(sa->size)) == NULL)
|
|
err(EXIT_FAILURE, "malloc failed");
|
|
if ((fp = fopen(fn, "r")) == NULL)
|
|
err(EXIT_FAILURE, "can not open %s", fn);
|
|
if (fread(sa->content, 1, sa->size, fp) == 0 ||
|
|
ferror(fp))
|
|
err(EXIT_FAILURE, "fread failed");
|
|
fclose(fp);
|
|
|
|
STAILQ_INSERT_TAIL(&ecp->v_sadd, sa, sadd_list);
|
|
ecp->flags |= SEC_ADD;
|
|
}
|
|
|
|
void
|
|
free_sec_add(struct elfcopy *ecp)
|
|
{
|
|
struct sec_add *sa, *sa_temp;
|
|
|
|
STAILQ_FOREACH_SAFE(sa, &ecp->v_sadd, sadd_list, sa_temp) {
|
|
STAILQ_REMOVE(&ecp->v_sadd, sa, sec_add, sadd_list);
|
|
free(sa->name);
|
|
free(sa->content);
|
|
free(sa);
|
|
}
|
|
}
|
|
|
|
static void
|
|
add_gnu_debuglink(struct elfcopy *ecp)
|
|
{
|
|
struct sec_add *sa;
|
|
struct stat sb;
|
|
FILE *fp;
|
|
char *fnbase, *buf;
|
|
int crc_off;
|
|
int crc;
|
|
|
|
if (ecp->debuglink == NULL)
|
|
return;
|
|
|
|
/* Read debug file content. */
|
|
if ((sa = malloc(sizeof(*sa))) == NULL)
|
|
err(EXIT_FAILURE, "malloc failed");
|
|
if ((sa->name = strdup(".gnu_debuglink")) == NULL)
|
|
err(EXIT_FAILURE, "strdup failed");
|
|
if (stat(ecp->debuglink, &sb) == -1)
|
|
err(EXIT_FAILURE, "stat failed");
|
|
if ((buf = malloc(sb.st_size)) == NULL)
|
|
err(EXIT_FAILURE, "malloc failed");
|
|
if ((fp = fopen(ecp->debuglink, "r")) == NULL)
|
|
err(EXIT_FAILURE, "can not open %s", ecp->debuglink);
|
|
if (fread(buf, 1, sb.st_size, fp) == 0 ||
|
|
ferror(fp))
|
|
err(EXIT_FAILURE, "fread failed");
|
|
fclose(fp);
|
|
|
|
/* Calculate crc checksum. */
|
|
crc = calc_crc32(buf, sb.st_size, 0xFFFFFFFF);
|
|
free(buf);
|
|
|
|
/* Calculate section size and the offset to store crc checksum. */
|
|
if ((fnbase = basename(ecp->debuglink)) == NULL)
|
|
err(EXIT_FAILURE, "basename failed");
|
|
crc_off = roundup(strlen(fnbase) + 1, 4);
|
|
sa->size = crc_off + 4;
|
|
|
|
/* Section content. */
|
|
if ((sa->content = calloc(1, sa->size)) == NULL)
|
|
err(EXIT_FAILURE, "malloc failed");
|
|
strncpy(sa->content, fnbase, strlen(fnbase));
|
|
if (ecp->oed == ELFDATA2LSB) {
|
|
sa->content[crc_off] = crc & 0xFF;
|
|
sa->content[crc_off + 1] = (crc >> 8) & 0xFF;
|
|
sa->content[crc_off + 2] = (crc >> 16) & 0xFF;
|
|
sa->content[crc_off + 3] = crc >> 24;
|
|
} else {
|
|
sa->content[crc_off] = crc >> 24;
|
|
sa->content[crc_off + 1] = (crc >> 16) & 0xFF;
|
|
sa->content[crc_off + 2] = (crc >> 8) & 0xFF;
|
|
sa->content[crc_off + 3] = crc & 0xFF;
|
|
}
|
|
|
|
STAILQ_INSERT_TAIL(&ecp->v_sadd, sa, sadd_list);
|
|
ecp->flags |= SEC_ADD;
|
|
}
|
|
|
|
static void
|
|
insert_to_strtab(struct section *t, const char *s)
|
|
{
|
|
const char *r;
|
|
char *b, *c;
|
|
size_t len, slen;
|
|
int append;
|
|
|
|
if (t->sz == 0) {
|
|
t->cap = 512;
|
|
if ((t->buf = malloc(t->cap)) == NULL)
|
|
err(EXIT_FAILURE, "malloc failed");
|
|
}
|
|
|
|
slen = strlen(s);
|
|
append = 0;
|
|
b = t->buf;
|
|
for (c = b; c < b + t->sz;) {
|
|
len = strlen(c);
|
|
if (!append && len >= slen) {
|
|
r = c + (len - slen);
|
|
if (strcmp(r, s) == 0)
|
|
return;
|
|
} else if (len < slen && len != 0) {
|
|
r = s + (slen - len);
|
|
if (strcmp(c, r) == 0) {
|
|
t->sz -= len + 1;
|
|
memmove(c, c + len + 1, t->sz - (c - b));
|
|
append = 1;
|
|
continue;
|
|
}
|
|
}
|
|
c += len + 1;
|
|
}
|
|
|
|
while (t->sz + slen + 1 >= t->cap) {
|
|
t->cap *= 2;
|
|
if ((t->buf = realloc(t->buf, t->cap)) == NULL)
|
|
err(EXIT_FAILURE, "realloc failed");
|
|
}
|
|
b = t->buf;
|
|
strncpy(&b[t->sz], s, slen);
|
|
b[t->sz + slen] = '\0';
|
|
t->sz += slen + 1;
|
|
}
|
|
|
|
static int
|
|
lookup_string(struct section *t, const char *s)
|
|
{
|
|
const char *b, *c, *r;
|
|
size_t len, slen;
|
|
|
|
slen = strlen(s);
|
|
b = t->buf;
|
|
for (c = b; c < b + t->sz;) {
|
|
len = strlen(c);
|
|
if (len >= slen) {
|
|
r = c + (len - slen);
|
|
if (strcmp(r, s) == 0)
|
|
return (r - b);
|
|
}
|
|
c += len + 1;
|
|
}
|
|
|
|
return (-1);
|
|
}
|
|
|
|
static uint32_t crctable[256] =
|
|
{
|
|
0x00000000L, 0x77073096L, 0xEE0E612CL, 0x990951BAL,
|
|
0x076DC419L, 0x706AF48FL, 0xE963A535L, 0x9E6495A3L,
|
|
0x0EDB8832L, 0x79DCB8A4L, 0xE0D5E91EL, 0x97D2D988L,
|
|
0x09B64C2BL, 0x7EB17CBDL, 0xE7B82D07L, 0x90BF1D91L,
|
|
0x1DB71064L, 0x6AB020F2L, 0xF3B97148L, 0x84BE41DEL,
|
|
0x1ADAD47DL, 0x6DDDE4EBL, 0xF4D4B551L, 0x83D385C7L,
|
|
0x136C9856L, 0x646BA8C0L, 0xFD62F97AL, 0x8A65C9ECL,
|
|
0x14015C4FL, 0x63066CD9L, 0xFA0F3D63L, 0x8D080DF5L,
|
|
0x3B6E20C8L, 0x4C69105EL, 0xD56041E4L, 0xA2677172L,
|
|
0x3C03E4D1L, 0x4B04D447L, 0xD20D85FDL, 0xA50AB56BL,
|
|
0x35B5A8FAL, 0x42B2986CL, 0xDBBBC9D6L, 0xACBCF940L,
|
|
0x32D86CE3L, 0x45DF5C75L, 0xDCD60DCFL, 0xABD13D59L,
|
|
0x26D930ACL, 0x51DE003AL, 0xC8D75180L, 0xBFD06116L,
|
|
0x21B4F4B5L, 0x56B3C423L, 0xCFBA9599L, 0xB8BDA50FL,
|
|
0x2802B89EL, 0x5F058808L, 0xC60CD9B2L, 0xB10BE924L,
|
|
0x2F6F7C87L, 0x58684C11L, 0xC1611DABL, 0xB6662D3DL,
|
|
0x76DC4190L, 0x01DB7106L, 0x98D220BCL, 0xEFD5102AL,
|
|
0x71B18589L, 0x06B6B51FL, 0x9FBFE4A5L, 0xE8B8D433L,
|
|
0x7807C9A2L, 0x0F00F934L, 0x9609A88EL, 0xE10E9818L,
|
|
0x7F6A0DBBL, 0x086D3D2DL, 0x91646C97L, 0xE6635C01L,
|
|
0x6B6B51F4L, 0x1C6C6162L, 0x856530D8L, 0xF262004EL,
|
|
0x6C0695EDL, 0x1B01A57BL, 0x8208F4C1L, 0xF50FC457L,
|
|
0x65B0D9C6L, 0x12B7E950L, 0x8BBEB8EAL, 0xFCB9887CL,
|
|
0x62DD1DDFL, 0x15DA2D49L, 0x8CD37CF3L, 0xFBD44C65L,
|
|
0x4DB26158L, 0x3AB551CEL, 0xA3BC0074L, 0xD4BB30E2L,
|
|
0x4ADFA541L, 0x3DD895D7L, 0xA4D1C46DL, 0xD3D6F4FBL,
|
|
0x4369E96AL, 0x346ED9FCL, 0xAD678846L, 0xDA60B8D0L,
|
|
0x44042D73L, 0x33031DE5L, 0xAA0A4C5FL, 0xDD0D7CC9L,
|
|
0x5005713CL, 0x270241AAL, 0xBE0B1010L, 0xC90C2086L,
|
|
0x5768B525L, 0x206F85B3L, 0xB966D409L, 0xCE61E49FL,
|
|
0x5EDEF90EL, 0x29D9C998L, 0xB0D09822L, 0xC7D7A8B4L,
|
|
0x59B33D17L, 0x2EB40D81L, 0xB7BD5C3BL, 0xC0BA6CADL,
|
|
0xEDB88320L, 0x9ABFB3B6L, 0x03B6E20CL, 0x74B1D29AL,
|
|
0xEAD54739L, 0x9DD277AFL, 0x04DB2615L, 0x73DC1683L,
|
|
0xE3630B12L, 0x94643B84L, 0x0D6D6A3EL, 0x7A6A5AA8L,
|
|
0xE40ECF0BL, 0x9309FF9DL, 0x0A00AE27L, 0x7D079EB1L,
|
|
0xF00F9344L, 0x8708A3D2L, 0x1E01F268L, 0x6906C2FEL,
|
|
0xF762575DL, 0x806567CBL, 0x196C3671L, 0x6E6B06E7L,
|
|
0xFED41B76L, 0x89D32BE0L, 0x10DA7A5AL, 0x67DD4ACCL,
|
|
0xF9B9DF6FL, 0x8EBEEFF9L, 0x17B7BE43L, 0x60B08ED5L,
|
|
0xD6D6A3E8L, 0xA1D1937EL, 0x38D8C2C4L, 0x4FDFF252L,
|
|
0xD1BB67F1L, 0xA6BC5767L, 0x3FB506DDL, 0x48B2364BL,
|
|
0xD80D2BDAL, 0xAF0A1B4CL, 0x36034AF6L, 0x41047A60L,
|
|
0xDF60EFC3L, 0xA867DF55L, 0x316E8EEFL, 0x4669BE79L,
|
|
0xCB61B38CL, 0xBC66831AL, 0x256FD2A0L, 0x5268E236L,
|
|
0xCC0C7795L, 0xBB0B4703L, 0x220216B9L, 0x5505262FL,
|
|
0xC5BA3BBEL, 0xB2BD0B28L, 0x2BB45A92L, 0x5CB36A04L,
|
|
0xC2D7FFA7L, 0xB5D0CF31L, 0x2CD99E8BL, 0x5BDEAE1DL,
|
|
0x9B64C2B0L, 0xEC63F226L, 0x756AA39CL, 0x026D930AL,
|
|
0x9C0906A9L, 0xEB0E363FL, 0x72076785L, 0x05005713L,
|
|
0x95BF4A82L, 0xE2B87A14L, 0x7BB12BAEL, 0x0CB61B38L,
|
|
0x92D28E9BL, 0xE5D5BE0DL, 0x7CDCEFB7L, 0x0BDBDF21L,
|
|
0x86D3D2D4L, 0xF1D4E242L, 0x68DDB3F8L, 0x1FDA836EL,
|
|
0x81BE16CDL, 0xF6B9265BL, 0x6FB077E1L, 0x18B74777L,
|
|
0x88085AE6L, 0xFF0F6A70L, 0x66063BCAL, 0x11010B5CL,
|
|
0x8F659EFFL, 0xF862AE69L, 0x616BFFD3L, 0x166CCF45L,
|
|
0xA00AE278L, 0xD70DD2EEL, 0x4E048354L, 0x3903B3C2L,
|
|
0xA7672661L, 0xD06016F7L, 0x4969474DL, 0x3E6E77DBL,
|
|
0xAED16A4AL, 0xD9D65ADCL, 0x40DF0B66L, 0x37D83BF0L,
|
|
0xA9BCAE53L, 0xDEBB9EC5L, 0x47B2CF7FL, 0x30B5FFE9L,
|
|
0xBDBDF21CL, 0xCABAC28AL, 0x53B39330L, 0x24B4A3A6L,
|
|
0xBAD03605L, 0xCDD70693L, 0x54DE5729L, 0x23D967BFL,
|
|
0xB3667A2EL, 0xC4614AB8L, 0x5D681B02L, 0x2A6F2B94L,
|
|
0xB40BBE37L, 0xC30C8EA1L, 0x5A05DF1BL, 0x2D02EF8DL
|
|
};
|
|
|
|
static uint32_t
|
|
calc_crc32(const char *p, size_t len, uint32_t crc)
|
|
{
|
|
uint32_t i;
|
|
|
|
for (i = 0; i < len; i++) {
|
|
crc = crctable[(crc ^ *p++) & 0xFFL] ^ (crc >> 8);
|
|
}
|
|
|
|
return (crc ^ 0xFFFFFFFF);
|
|
}
|