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      1 /* $NetBSD: exec_elf32.c,v 1.13 2016/09/21 16:25:41 christos Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1996 Christopher G. Demetriou
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  *
     29  * <<Id: LICENSE_GC,v 1.1 2001/10/01 23:24:05 cgd Exp>>
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __RCSID("$NetBSD: exec_elf32.c,v 1.13 2016/09/21 16:25:41 christos Exp $");
     35 #endif /* not lint */
     36 
     37 #ifndef ELFSIZE
     38 #define	ELFSIZE		32
     39 #endif
     40 
     41 #include <sys/types.h>
     42 #include <stdio.h>
     43 #include <string.h>
     44 #include "extern.h"
     45 
     46 #if defined(NLIST_ELF32) || defined(NLIST_ELF64)
     47 #include <sys/exec_elf.h>
     48 #endif
     49 
     50 #if (defined(NLIST_ELF32) && (ELFSIZE == 32)) || \
     51     (defined(NLIST_ELF64) && (ELFSIZE == 64))
     52 
     53 #define	check(off, size)	((off < 0) || (off + size > mappedsize))
     54 #define	BAD			do { rv = -1; goto out; } while (0)
     55 
     56 int
     57 ELFNAMEEND(check)(const char *mappedfile, size_t mappedsize)
     58 {
     59 	const Elf_Ehdr *ehdrp;
     60 	int rv;
     61 
     62 	rv = 0;
     63 
     64 	if (check(0, sizeof *ehdrp))
     65 		BAD;
     66 	ehdrp = (const Elf_Ehdr *)&mappedfile[0];
     67 
     68 	if (memcmp(ehdrp->e_ident, ELFMAG, SELFMAG) != 0 ||
     69 	    ehdrp->e_ident[EI_CLASS] != ELFCLASS)
     70 		BAD;
     71 
     72 	switch (ehdrp->e_machine) {
     73 	ELFDEFNNAME(MACHDEP_ID_CASES)
     74 
     75 	default:
     76 		BAD;
     77 	}
     78 
     79 out:
     80 	return (rv);
     81 }
     82 
     83 int
     84 ELFNAMEEND(findoff)(const char *mappedfile, size_t mappedsize, u_long vmaddr,
     85     size_t *fileoffp, u_long text_addr)
     86 {
     87 	const Elf_Ehdr *ehdrp;
     88 	const Elf_Phdr *phdrp;
     89 	Elf_Off phdr_off;
     90 	Elf_Word phdr_size;
     91 #if (ELFSIZE == 32)
     92 	Elf32_Half nphdr, i;
     93 #elif (ELFSIZE == 64)
     94 	Elf64_Word nphdr, i;
     95 #endif
     96 	int rv;
     97 
     98 	rv = 0;
     99 
    100 	ehdrp = (const Elf_Ehdr *)&mappedfile[0];
    101 	nphdr = ehdrp->e_phnum;
    102 	phdr_off = ehdrp->e_phoff;
    103 	phdr_size = sizeof(Elf_Phdr) * nphdr;
    104 
    105 	if (check(0, phdr_off + phdr_size))
    106 		BAD;
    107 	phdrp = (const Elf_Phdr *)&mappedfile[phdr_off];
    108 
    109 #define IS_TEXT(p)	(p.p_flags & PF_X)
    110 #define IS_DATA(p)	(p.p_flags & PF_W)
    111 
    112 	for (i = 0; i < nphdr; i++) {
    113 		if ((IS_TEXT(phdrp[i]) || IS_DATA(phdrp[i])) &&
    114 		    phdrp[i].p_vaddr <= vmaddr &&
    115 		    vmaddr < phdrp[i].p_vaddr + phdrp[i].p_filesz) {
    116 			*fileoffp = vmaddr -
    117 			    phdrp[i].p_vaddr + phdrp[i].p_offset;
    118 			break;
    119 		}
    120 	}
    121 	if (i == nphdr)
    122 		BAD;
    123 
    124 out:
    125 	return (rv);
    126 }
    127 
    128 #endif /* include this size of ELF */
    129