129 lines
3.5 KiB
C
129 lines
3.5 KiB
C
/* $NetBSD: exec_elf32.c,v 1.13 2016/09/21 16:25:41 christos Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1996 Christopher G. Demetriou
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* <<Id: LICENSE_GC,v 1.1 2001/10/01 23:24:05 cgd Exp>>
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#ifndef lint
|
|
__RCSID("$NetBSD: exec_elf32.c,v 1.13 2016/09/21 16:25:41 christos Exp $");
|
|
#endif /* not lint */
|
|
|
|
#ifndef ELFSIZE
|
|
#define ELFSIZE 32
|
|
#endif
|
|
|
|
#include <sys/types.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include "extern.h"
|
|
|
|
#if defined(NLIST_ELF32) || defined(NLIST_ELF64)
|
|
#include <sys/exec_elf.h>
|
|
#endif
|
|
|
|
#if (defined(NLIST_ELF32) && (ELFSIZE == 32)) || \
|
|
(defined(NLIST_ELF64) && (ELFSIZE == 64))
|
|
|
|
#define check(off, size) ((off < 0) || (off + size > mappedsize))
|
|
#define BAD do { rv = -1; goto out; } while (0)
|
|
|
|
int
|
|
ELFNAMEEND(check)(const char *mappedfile, size_t mappedsize)
|
|
{
|
|
const Elf_Ehdr *ehdrp;
|
|
int rv;
|
|
|
|
rv = 0;
|
|
|
|
if (check(0, sizeof *ehdrp))
|
|
BAD;
|
|
ehdrp = (const Elf_Ehdr *)&mappedfile[0];
|
|
|
|
if (memcmp(ehdrp->e_ident, ELFMAG, SELFMAG) != 0 ||
|
|
ehdrp->e_ident[EI_CLASS] != ELFCLASS)
|
|
BAD;
|
|
|
|
switch (ehdrp->e_machine) {
|
|
ELFDEFNNAME(MACHDEP_ID_CASES)
|
|
|
|
default:
|
|
BAD;
|
|
}
|
|
|
|
out:
|
|
return (rv);
|
|
}
|
|
|
|
int
|
|
ELFNAMEEND(findoff)(const char *mappedfile, size_t mappedsize, u_long vmaddr,
|
|
size_t *fileoffp, u_long text_addr)
|
|
{
|
|
const Elf_Ehdr *ehdrp;
|
|
const Elf_Phdr *phdrp;
|
|
Elf_Off phdr_off;
|
|
Elf_Word phdr_size;
|
|
#if (ELFSIZE == 32)
|
|
Elf32_Half nphdr, i;
|
|
#elif (ELFSIZE == 64)
|
|
Elf64_Word nphdr, i;
|
|
#endif
|
|
int rv;
|
|
|
|
rv = 0;
|
|
|
|
ehdrp = (const Elf_Ehdr *)&mappedfile[0];
|
|
nphdr = ehdrp->e_phnum;
|
|
phdr_off = ehdrp->e_phoff;
|
|
phdr_size = sizeof(Elf_Phdr) * nphdr;
|
|
|
|
if (check(0, phdr_off + phdr_size))
|
|
BAD;
|
|
phdrp = (const Elf_Phdr *)&mappedfile[phdr_off];
|
|
|
|
#define IS_TEXT(p) (p.p_flags & PF_X)
|
|
#define IS_DATA(p) (p.p_flags & PF_W)
|
|
|
|
for (i = 0; i < nphdr; i++) {
|
|
if ((IS_TEXT(phdrp[i]) || IS_DATA(phdrp[i])) &&
|
|
phdrp[i].p_vaddr <= vmaddr &&
|
|
vmaddr < phdrp[i].p_vaddr + phdrp[i].p_filesz) {
|
|
*fileoffp = vmaddr -
|
|
phdrp[i].p_vaddr + phdrp[i].p_offset;
|
|
break;
|
|
}
|
|
}
|
|
if (i == nphdr)
|
|
BAD;
|
|
|
|
out:
|
|
return (rv);
|
|
}
|
|
|
|
#endif /* include this size of ELF */
|