Add support for reading ELF relocatable object file format modules.
This commit is contained in:
parent
85cdc19d00
commit
4a8b7e33b7
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=134361
@ -2,7 +2,7 @@
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PROG= kldxref
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MAN= kldxref.8
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SRCS= kldxref.c ef.c
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SRCS= kldxref.c ef.c ef_obj.c
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WARNS?= 2
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usr.sbin/kldxref/ef_obj.c
Normal file
602
usr.sbin/kldxref/ef_obj.c
Normal file
@ -0,0 +1,602 @@
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/*
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* Copyright (c) 2000, Boris Popov
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* Copyright (c) 1998-2000 Doug Rabson
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* Copyright (c) 2004 Peter Wemm
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Boris Popov.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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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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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/linker.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <machine/elf.h>
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#define FREEBSD_ELF
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#include <link.h>
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#include <err.h>
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#include "ef.h"
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typedef struct {
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void *addr;
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Elf_Off size;
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int flags;
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int sec; /* Original section */
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char *name;
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} Elf_progent;
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typedef struct {
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Elf_Rel *rel;
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int nrel;
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int sec;
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} Elf_relent;
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typedef struct {
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Elf_Rela *rela;
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int nrela;
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int sec;
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} Elf_relaent;
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struct ef_file {
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char *ef_name;
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int ef_fd;
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Elf_Ehdr ef_hdr;
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struct elf_file *ef_efile;
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caddr_t address;
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Elf_Off size;
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Elf_Shdr *e_shdr;
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Elf_progent *progtab;
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int nprogtab;
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Elf_relaent *relatab;
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int nrela;
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Elf_relent *reltab;
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int nrel;
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Elf_Sym *ddbsymtab; /* The symbol table we are using */
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long ddbsymcnt; /* Number of symbols */
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caddr_t ddbstrtab; /* String table */
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long ddbstrcnt; /* number of bytes in string table */
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caddr_t shstrtab; /* Section name string table */
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long shstrcnt; /* number of bytes in string table */
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int ef_verbose;
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};
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static int ef_obj_get_type(elf_file_t ef);
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static int ef_obj_close(elf_file_t ef);
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static int ef_obj_read(elf_file_t ef, Elf_Off offset, size_t len, void* dest);
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static int ef_obj_read_entry(elf_file_t ef, Elf_Off offset, size_t len,
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void **ptr);
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static int ef_obj_seg_read(elf_file_t ef, Elf_Off offset, size_t len,
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void *dest);
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static int ef_obj_seg_read_rel(elf_file_t ef, Elf_Off offset, size_t len,
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void *dest);
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static int ef_obj_seg_read_entry(elf_file_t ef, Elf_Off offset, size_t len,
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void **ptr);
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static int ef_obj_seg_read_entry_rel(elf_file_t ef, Elf_Off offset, size_t len,
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void **ptr);
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static Elf_Addr ef_obj_symaddr(elf_file_t ef, Elf_Word symidx);
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static int ef_obj_lookup_set(elf_file_t ef, const char *name, long *startp,
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long *stopp, long *countp);
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static int ef_obj_lookup_symbol(elf_file_t ef, const char* name, Elf_Sym** sym);
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static struct elf_file_ops ef_obj_file_ops = {
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ef_obj_get_type,
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ef_obj_close,
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ef_obj_read,
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ef_obj_read_entry,
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ef_obj_seg_read,
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ef_obj_seg_read_rel,
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ef_obj_seg_read_entry,
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ef_obj_seg_read_entry_rel,
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ef_obj_symaddr,
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ef_obj_lookup_set,
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ef_obj_lookup_symbol
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};
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static int
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ef_obj_get_type(elf_file_t ef)
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{
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return (EFT_KLD);
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}
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static int
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ef_obj_lookup_symbol(elf_file_t ef, const char* name, Elf_Sym** sym)
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{
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Elf_Sym *symp;
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const char *strp;
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int i;
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for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
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strp = ef->ddbstrtab + symp->st_name;
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if (symp->st_shndx != SHN_UNDEF && strcmp(name, strp) == 0) {
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*sym = symp;
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return 0;
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}
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}
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return ENOENT;
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}
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static int
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ef_obj_lookup_set(elf_file_t ef, const char *name, long *startp, long *stopp,
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long *countp)
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{
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int i;
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for (i = 0; i < ef->nprogtab; i++) {
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if ((strncmp(ef->progtab[i].name, "set_", 4) == 0) &&
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strcmp(ef->progtab[i].name + 4, name) == 0) {
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*startp = (char *)ef->progtab[i].addr - ef->address;
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*stopp = (char *)ef->progtab[i].addr +
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ef->progtab[i].size - ef->address;
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*countp = (*stopp - *startp) / sizeof(void *);
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return (0);
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}
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}
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return (ESRCH);
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}
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static Elf_Addr
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ef_obj_symaddr(elf_file_t ef, Elf_Word symidx)
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{
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const Elf_Sym *sym;
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if (symidx >= ef->ddbsymcnt)
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return (0);
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sym = ef->ddbsymtab + symidx;
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if (sym->st_shndx != SHN_UNDEF)
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return (sym->st_value - (Elf_Addr)ef->address);
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return (0);
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}
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static int
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ef_obj_read(elf_file_t ef, Elf_Off offset, size_t len, void *dest)
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{
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ssize_t r;
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if (offset != (Elf_Off)-1) {
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if (lseek(ef->ef_fd, offset, SEEK_SET) == -1)
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return EIO;
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}
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r = read(ef->ef_fd, dest, len);
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if (r != -1 && (size_t)r == len)
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return 0;
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else
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return EIO;
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}
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static int
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ef_obj_read_entry(elf_file_t ef, Elf_Off offset, size_t len, void **ptr)
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{
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int error;
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*ptr = malloc(len);
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if (*ptr == NULL)
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return ENOMEM;
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error = ef_obj_read(ef, offset, len, *ptr);
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if (error)
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free(*ptr);
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return error;
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}
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static int
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ef_obj_seg_read(elf_file_t ef, Elf_Off offset, size_t len, void *dest)
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{
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if (offset + len > ef->size) {
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if (ef->ef_verbose)
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warnx("ef_seg_read_rel(%s): bad offset/len (%lx:%ld)",
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ef->ef_name, (long)offset, (long)len);
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return (EFAULT);
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}
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bcopy(ef->address + offset, dest, len);
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return (0);
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}
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static int
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ef_obj_seg_read_rel(elf_file_t ef, Elf_Off offset, size_t len, void *dest)
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{
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char *memaddr;
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Elf_Rel *r;
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Elf_Rela *a;
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Elf_Off secoff;
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int error, i, sec;
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if (offset + len > ef->size) {
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if (ef->ef_verbose)
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warnx("ef_seg_read_rel(%s): bad offset/len (%lx:%ld)",
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ef->ef_name, (long)offset, (long)len);
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return (EFAULT);
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}
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bcopy(ef->address + offset, dest, len);
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/* Find out which section contains the data. */
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memaddr = ef->address + offset;
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sec = -1;
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for (i = 0; i < ef->nprogtab; i++) {
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if (ef->progtab[i].addr == NULL)
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continue;
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if (memaddr < (char *)ef->progtab[i].addr || memaddr + len >
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(char *)ef->progtab[i].addr + ef->progtab[i].size)
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continue;
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sec = ef->progtab[i].sec;
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secoff = memaddr - (char *)ef->progtab[i].addr;
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break;
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}
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if (sec == -1)
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return (EFAULT);
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/* Now do the relocations. */
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for (i = 0; i < ef->nrel; i++) {
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if (ef->reltab[i].sec != sec)
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continue;
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for (r = ef->reltab[i].rel;
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r < &ef->reltab[i].rel[ef->reltab[i].nrel]; r++) {
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error = ef_reloc(ef->ef_efile, r, EF_RELOC_REL, secoff,
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len, dest);
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if (error != 0)
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return (error);
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}
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}
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for (i = 0; i < ef->nrela; i++) {
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if (ef->relatab[i].sec != sec)
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continue;
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for (a = ef->relatab[i].rela;
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a < &ef->relatab[i].rela[ef->relatab[i].nrela]; a++) {
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error = ef_reloc(ef->ef_efile, a, EF_RELOC_RELA, secoff,
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len, dest);
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if (error != 0)
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return (error);
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}
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}
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return (0);
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}
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static int
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ef_obj_seg_read_entry(elf_file_t ef, Elf_Off offset, size_t len, void **ptr)
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{
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int error;
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*ptr = malloc(len);
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if (*ptr == NULL)
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return ENOMEM;
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error = ef_obj_seg_read(ef, offset, len, *ptr);
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if (error)
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free(*ptr);
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return error;
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}
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static int
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ef_obj_seg_read_entry_rel(elf_file_t ef, Elf_Off offset, size_t len,
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void **ptr)
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{
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int error;
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*ptr = malloc(len);
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if (*ptr == NULL)
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return ENOMEM;
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error = ef_obj_seg_read_rel(ef, offset, len, *ptr);
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if (error)
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free(*ptr);
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return error;
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}
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int
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ef_obj_open(const char *filename, struct elf_file *efile, int verbose)
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{
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elf_file_t ef;
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Elf_Ehdr *hdr;
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Elf_Shdr *shdr;
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Elf_Sym *es;
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char *mapbase;
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size_t mapsize;
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int alignmask, error, fd, pb, ra, res, rl;
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int i, j, nbytes, nsym, shstrindex, symstrindex, symtabindex;
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if (filename == NULL)
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return EFTYPE;
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if ((fd = open(filename, O_RDONLY)) == -1)
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return errno;
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ef = malloc(sizeof(*ef));
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if (ef == NULL) {
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close(fd);
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return (ENOMEM);
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}
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efile->ef_ef = ef;
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efile->ef_ops = &ef_obj_file_ops;
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bzero(ef, sizeof(*ef));
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ef->ef_verbose = verbose;
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ef->ef_fd = fd;
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ef->ef_name = strdup(filename);
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ef->ef_efile = efile;
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hdr = (Elf_Ehdr *)&ef->ef_hdr;
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res = read(fd, hdr, sizeof(*hdr));
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error = EFTYPE;
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if (res != sizeof(*hdr))
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goto out;
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if (!IS_ELF(*hdr))
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goto out;
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if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
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hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
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hdr->e_ident[EI_VERSION] != EV_CURRENT ||
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hdr->e_version != EV_CURRENT || hdr->e_machine != ELF_TARG_MACH ||
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hdr->e_type != ET_REL)
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goto out;
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nbytes = hdr->e_shnum * hdr->e_shentsize;
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if (nbytes == 0 || hdr->e_shoff == 0 ||
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hdr->e_shentsize != sizeof(Elf_Shdr))
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goto out;
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if (ef_obj_read_entry(ef, hdr->e_shoff, nbytes, (void**)&shdr) != 0) {
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printf("ef_read_entry failed\n");
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goto out;
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}
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ef->e_shdr = shdr;
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/* Scan the section header for information and table sizing. */
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nsym = 0;
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symtabindex = -1;
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symstrindex = -1;
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for (i = 0; i < hdr->e_shnum; i++) {
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switch (shdr[i].sh_type) {
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case SHT_PROGBITS:
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case SHT_NOBITS:
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ef->nprogtab++;
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break;
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case SHT_SYMTAB:
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nsym++;
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symtabindex = i;
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symstrindex = shdr[i].sh_link;
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break;
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case SHT_REL:
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ef->nrel++;
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break;
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case SHT_RELA:
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ef->nrela++;
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break;
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case SHT_STRTAB:
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break;
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}
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}
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if (ef->nprogtab == 0) {
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warnx("%s: file has no contents", filename);
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goto out;
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}
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if (nsym != 1) {
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warnx("%s: file has no valid symbol table", filename);
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goto out;
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}
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if (symstrindex < 0 || symstrindex > hdr->e_shnum ||
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shdr[symstrindex].sh_type != SHT_STRTAB) {
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warnx("%s: file has invalid symbol strings", filename);
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goto out;
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}
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/* Allocate space for tracking the load chunks */
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if (ef->nprogtab != 0)
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ef->progtab = calloc(ef->nprogtab, sizeof(*ef->progtab));
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if (ef->nrel != 0)
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ef->reltab = calloc(ef->nrel, sizeof(*ef->reltab));
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if (ef->nrela != 0)
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ef->relatab = calloc(ef->nrela, sizeof(*ef->relatab));
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if ((ef->nprogtab != 0 && ef->progtab == NULL) ||
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(ef->nrel != 0 && ef->reltab == NULL) ||
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(ef->nrela != 0 && ef->relatab == NULL)) {
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printf("malloc failed\n");
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error = ENOMEM;
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goto out;
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}
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ef->ddbsymcnt = shdr[symtabindex].sh_size / sizeof(Elf_Sym);
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if (ef_obj_read_entry(ef, shdr[symtabindex].sh_offset,
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shdr[symtabindex].sh_size, (void**)&ef->ddbsymtab) != 0) {
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printf("ef_read_entry failed\n");
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goto out;
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}
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ef->ddbstrcnt = shdr[symstrindex].sh_size;
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if (ef_obj_read_entry(ef, shdr[symstrindex].sh_offset,
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shdr[symstrindex].sh_size, (void**)&ef->ddbstrtab) != 0) {
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printf("ef_read_entry failed\n");
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goto out;
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}
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/* Do we have a string table for the section names? */
|
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shstrindex = -1;
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if (hdr->e_shstrndx != 0 &&
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shdr[hdr->e_shstrndx].sh_type == SHT_STRTAB) {
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shstrindex = hdr->e_shstrndx;
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ef->shstrcnt = shdr[shstrindex].sh_size;
|
||||
if (ef_obj_read_entry(ef, shdr[shstrindex].sh_offset,
|
||||
shdr[shstrindex].sh_size, (void**)&ef->shstrtab) != 0) {
|
||||
printf("ef_read_entry failed\n");
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
|
||||
/* Size up code/data(progbits) and bss(nobits). */
|
||||
alignmask = 0;
|
||||
mapsize = 0;
|
||||
for (i = 0; i < hdr->e_shnum; i++) {
|
||||
switch (shdr[i].sh_type) {
|
||||
case SHT_PROGBITS:
|
||||
case SHT_NOBITS:
|
||||
alignmask = shdr[i].sh_addralign - 1;
|
||||
mapsize += alignmask;
|
||||
mapsize &= ~alignmask;
|
||||
mapsize += shdr[i].sh_size;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* We know how much space we need for the text/data/bss/etc. */
|
||||
ef->address = malloc(mapsize);
|
||||
ef->size = mapsize;
|
||||
if (ef->address == NULL) {
|
||||
printf("malloc failed\n");
|
||||
goto out;
|
||||
}
|
||||
mapbase = ef->address;
|
||||
|
||||
/*
|
||||
* Now load code/data(progbits), zero bss(nobits), allocate
|
||||
* space for and load relocs
|
||||
*/
|
||||
pb = 0;
|
||||
rl = 0;
|
||||
ra = 0;
|
||||
alignmask = 0;
|
||||
for (i = 0; i < hdr->e_shnum; i++) {
|
||||
switch (shdr[i].sh_type) {
|
||||
case SHT_PROGBITS:
|
||||
case SHT_NOBITS:
|
||||
alignmask = shdr[i].sh_addralign - 1;
|
||||
mapbase += alignmask;
|
||||
mapbase = (char *)((uintptr_t)mapbase & ~alignmask);
|
||||
ef->progtab[pb].addr = (void *)(uintptr_t)mapbase;
|
||||
if (shdr[i].sh_type == SHT_PROGBITS) {
|
||||
ef->progtab[pb].name = "<<PROGBITS>>";
|
||||
if (ef_obj_read(ef, shdr[i].sh_offset,
|
||||
shdr[i].sh_size,
|
||||
ef->progtab[pb].addr) != 0) {
|
||||
printf("failed to read progbits\n");
|
||||
goto out;
|
||||
}
|
||||
} else {
|
||||
ef->progtab[pb].name = "<<NOBITS>>";
|
||||
bzero(ef->progtab[pb].addr, shdr[i].sh_size);
|
||||
}
|
||||
ef->progtab[pb].size = shdr[i].sh_size;
|
||||
ef->progtab[pb].sec = i;
|
||||
if (ef->shstrtab && shdr[i].sh_name != 0)
|
||||
ef->progtab[pb].name =
|
||||
ef->shstrtab + shdr[i].sh_name;
|
||||
|
||||
/* Update all symbol values with the offset. */
|
||||
for (j = 0; j < ef->ddbsymcnt; j++) {
|
||||
es = &ef->ddbsymtab[j];
|
||||
if (es->st_shndx != i)
|
||||
continue;
|
||||
es->st_value += (Elf_Addr)ef->progtab[pb].addr;
|
||||
}
|
||||
mapbase += shdr[i].sh_size;
|
||||
pb++;
|
||||
break;
|
||||
case SHT_REL:
|
||||
ef->reltab[rl].nrel = shdr[i].sh_size / sizeof(Elf_Rel);
|
||||
ef->reltab[rl].sec = shdr[i].sh_info;
|
||||
if (ef_obj_read_entry(ef, shdr[i].sh_offset,
|
||||
shdr[i].sh_size, (void**)&ef->reltab[rl].rel) !=
|
||||
0) {
|
||||
printf("ef_read_entry failed\n");
|
||||
goto out;
|
||||
}
|
||||
rl++;
|
||||
break;
|
||||
case SHT_RELA:
|
||||
ef->relatab[ra].nrela =
|
||||
shdr[i].sh_size / sizeof(Elf_Rela);
|
||||
ef->relatab[ra].sec = shdr[i].sh_info;
|
||||
if (ef_obj_read_entry(ef, shdr[i].sh_offset,
|
||||
shdr[i].sh_size, (void**)&ef->relatab[ra].rela) !=
|
||||
0) {
|
||||
printf("ef_read_entry failed\n");
|
||||
goto out;
|
||||
}
|
||||
ra++;
|
||||
break;
|
||||
}
|
||||
}
|
||||
error = 0;
|
||||
out:
|
||||
if (error)
|
||||
ef_obj_close(ef);
|
||||
return error;
|
||||
}
|
||||
|
||||
static int
|
||||
ef_obj_close(elf_file_t ef)
|
||||
{
|
||||
int i;
|
||||
|
||||
close(ef->ef_fd);
|
||||
if (ef->ef_name)
|
||||
free(ef->ef_name);
|
||||
if (ef->e_shdr != NULL)
|
||||
free(ef->e_shdr);
|
||||
if (ef->size != 0)
|
||||
free(ef->address);
|
||||
if (ef->nprogtab != 0)
|
||||
free(ef->progtab);
|
||||
if (ef->nrel != 0) {
|
||||
for (i = 0; i < ef->nrel; i++)
|
||||
if (ef->reltab[i].rel != NULL)
|
||||
free(ef->reltab[i].rel);
|
||||
free(ef->reltab);
|
||||
}
|
||||
if (ef->nrela != 0) {
|
||||
for (i = 0; i < ef->nrela; i++)
|
||||
if (ef->relatab[i].rela != NULL)
|
||||
free(ef->relatab[i].rela);
|
||||
free(ef->relatab);
|
||||
}
|
||||
if (ef->ddbsymtab != NULL)
|
||||
free(ef->ddbsymtab);
|
||||
if (ef->ddbstrtab != NULL)
|
||||
free(ef->ddbstrtab);
|
||||
if (ef->shstrtab != NULL)
|
||||
free(ef->shstrtab);
|
||||
ef->ef_efile->ef_ops = NULL;
|
||||
ef->ef_efile->ef_ef = NULL;
|
||||
free(ef);
|
||||
|
||||
return 0;
|
||||
}
|
@ -210,9 +210,12 @@ read_kld(char *filename, char *kldname)
|
||||
printf("%s\n", filename);
|
||||
error = ef_open(filename, &ef, verbose);
|
||||
if (error) {
|
||||
if (verbose)
|
||||
warnc(error, "elf_open(%s)", filename);
|
||||
return error;
|
||||
error = ef_obj_open(filename, &ef, verbose);
|
||||
if (error) {
|
||||
if (verbose)
|
||||
warnc(error, "elf_open(%s)", filename);
|
||||
return error;
|
||||
}
|
||||
}
|
||||
eftype = EF_GET_TYPE(&ef);
|
||||
if (eftype != EFT_KLD && eftype != EFT_KERNEL) {
|
||||
|
Loading…
Reference in New Issue
Block a user