1036 lines
25 KiB
C
1036 lines
25 KiB
C
/*
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* Copyright (c) Christos Zoulas 2003.
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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 immediately at the beginning of the file, without modification,
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* 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 FOR
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* 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 "file.h"
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#ifdef BUILTIN_ELF
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#include <string.h>
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#include <ctype.h>
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#include <stdlib.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "readelf.h"
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#ifndef lint
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FILE_RCSID("@(#)$File: readelf.c,v 1.68 2007/12/27 16:13:26 christos Exp $")
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#endif
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#ifdef ELFCORE
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private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t,
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off_t, int *);
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#endif
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private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t,
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off_t, int *);
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private int doshn(struct magic_set *, int, int, int, off_t, int, size_t, int *);
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private size_t donote(struct magic_set *, unsigned char *, size_t, size_t, int,
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int, size_t, int *);
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#define ELF_ALIGN(a) ((((a) + align - 1) / align) * align)
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#define isquote(c) (strchr("'\"`", (c)) != NULL)
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private uint16_t getu16(int, uint16_t);
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private uint32_t getu32(int, uint32_t);
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private uint64_t getu64(int, uint64_t);
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private uint16_t
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getu16(int swap, uint16_t value)
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{
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union {
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uint16_t ui;
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char c[2];
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} retval, tmpval;
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if (swap) {
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tmpval.ui = value;
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retval.c[0] = tmpval.c[1];
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retval.c[1] = tmpval.c[0];
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return retval.ui;
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} else
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return value;
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}
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private uint32_t
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getu32(int swap, uint32_t value)
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{
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union {
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uint32_t ui;
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char c[4];
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} retval, tmpval;
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if (swap) {
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tmpval.ui = value;
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retval.c[0] = tmpval.c[3];
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retval.c[1] = tmpval.c[2];
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retval.c[2] = tmpval.c[1];
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retval.c[3] = tmpval.c[0];
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return retval.ui;
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} else
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return value;
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}
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private uint64_t
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getu64(int swap, uint64_t value)
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{
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union {
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uint64_t ui;
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char c[8];
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} retval, tmpval;
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if (swap) {
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tmpval.ui = value;
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retval.c[0] = tmpval.c[7];
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retval.c[1] = tmpval.c[6];
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retval.c[2] = tmpval.c[5];
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retval.c[3] = tmpval.c[4];
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retval.c[4] = tmpval.c[3];
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retval.c[5] = tmpval.c[2];
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retval.c[6] = tmpval.c[1];
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retval.c[7] = tmpval.c[0];
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return retval.ui;
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} else
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return value;
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}
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#ifdef USE_ARRAY_FOR_64BIT_TYPES
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# define elf_getu64(swap, array) \
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((swap ? ((uint64_t)getu32(swap, array[0])) << 32 : getu32(swap, array[0])) + \
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(swap ? getu32(swap, array[1]) : ((uint64_t)getu32(swap, array[1]) << 32)))
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#else
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# define elf_getu64(swap, value) getu64(swap, value)
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#endif
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#define xsh_addr (class == ELFCLASS32 \
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? (void *) &sh32 \
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: (void *) &sh64)
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#define xsh_sizeof (class == ELFCLASS32 \
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? sizeof sh32 \
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: sizeof sh64)
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#define xsh_size (class == ELFCLASS32 \
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? getu32(swap, sh32.sh_size) \
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: getu64(swap, sh64.sh_size))
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#define xsh_offset (class == ELFCLASS32 \
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? getu32(swap, sh32.sh_offset) \
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: getu64(swap, sh64.sh_offset))
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#define xsh_type (class == ELFCLASS32 \
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? getu32(swap, sh32.sh_type) \
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: getu32(swap, sh64.sh_type))
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#define xph_addr (class == ELFCLASS32 \
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? (void *) &ph32 \
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: (void *) &ph64)
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#define xph_sizeof (class == ELFCLASS32 \
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? sizeof ph32 \
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: sizeof ph64)
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#define xph_type (class == ELFCLASS32 \
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? getu32(swap, ph32.p_type) \
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: getu32(swap, ph64.p_type))
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#define xph_offset (off_t)(class == ELFCLASS32 \
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? getu32(swap, ph32.p_offset) \
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: getu64(swap, ph64.p_offset))
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#define xph_align (size_t)((class == ELFCLASS32 \
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? (off_t) (ph32.p_align ? \
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getu32(swap, ph32.p_align) : 4) \
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: (off_t) (ph64.p_align ? \
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getu64(swap, ph64.p_align) : 4)))
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#define xph_filesz (size_t)((class == ELFCLASS32 \
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? getu32(swap, ph32.p_filesz) \
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: getu64(swap, ph64.p_filesz)))
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#define xnh_addr (class == ELFCLASS32 \
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? (void *) &nh32 \
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: (void *) &nh64)
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#define xph_memsz (size_t)((class == ELFCLASS32 \
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? getu32(swap, ph32.p_memsz) \
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: getu64(swap, ph64.p_memsz)))
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#define xnh_sizeof (class == ELFCLASS32 \
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? sizeof nh32 \
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: sizeof nh64)
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#define xnh_type (class == ELFCLASS32 \
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? getu32(swap, nh32.n_type) \
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: getu32(swap, nh64.n_type))
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#define xnh_namesz (class == ELFCLASS32 \
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? getu32(swap, nh32.n_namesz) \
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: getu32(swap, nh64.n_namesz))
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#define xnh_descsz (class == ELFCLASS32 \
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? getu32(swap, nh32.n_descsz) \
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: getu32(swap, nh64.n_descsz))
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#define prpsoffsets(i) (class == ELFCLASS32 \
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? prpsoffsets32[i] \
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: prpsoffsets64[i])
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#ifdef ELFCORE
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size_t prpsoffsets32[] = {
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8, /* FreeBSD */
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44, /* Linux (path name) */
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28, /* Linux 2.0.36 (short name) */
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84, /* SunOS 5.x */
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};
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size_t prpsoffsets64[] = {
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16, /* FreeBSD, 64-bit */
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56, /* Linux (path name) */
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40, /* Linux (tested on core from 2.4.x, short name) */
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120, /* SunOS 5.x, 64-bit */
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};
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#define NOFFSETS32 (sizeof prpsoffsets32 / sizeof prpsoffsets32[0])
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#define NOFFSETS64 (sizeof prpsoffsets64 / sizeof prpsoffsets64[0])
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#define NOFFSETS (class == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64)
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/*
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* Look through the program headers of an executable image, searching
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* for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or
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* "FreeBSD"; if one is found, try looking in various places in its
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* contents for a 16-character string containing only printable
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* characters - if found, that string should be the name of the program
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* that dropped core. Note: right after that 16-character string is,
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* at least in SunOS 5.x (and possibly other SVR4-flavored systems) and
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* Linux, a longer string (80 characters, in 5.x, probably other
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* SVR4-flavored systems, and Linux) containing the start of the
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* command line for that program.
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*
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* The signal number probably appears in a section of type NT_PRSTATUS,
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* but that's also rather OS-dependent, in ways that are harder to
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* dissect with heuristics, so I'm not bothering with the signal number.
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* (I suppose the signal number could be of interest in situations where
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* you don't have the binary of the program that dropped core; if you
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* *do* have that binary, the debugger will probably tell you what
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* signal it was.)
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*/
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#define OS_STYLE_SVR4 0
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#define OS_STYLE_FREEBSD 1
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#define OS_STYLE_NETBSD 2
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private const char *os_style_names[] = {
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"SVR4",
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"FreeBSD",
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"NetBSD",
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};
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#define FLAGS_DID_CORE 1
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#define FLAGS_DID_NOTE 2
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#define FLAGS_DID_CORE_STYLE 4
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private int
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dophn_core(struct magic_set *ms, int class, int swap, int fd, off_t off,
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int num, size_t size, off_t fsize, int *flags)
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{
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Elf32_Phdr ph32;
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Elf64_Phdr ph64;
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size_t offset;
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unsigned char nbuf[BUFSIZ];
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ssize_t bufsize;
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off_t savedoffset;
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struct stat st;
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if (fstat(fd, &st) < 0) {
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file_badread(ms);
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return -1;
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}
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if (size != xph_sizeof) {
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if (file_printf(ms, ", corrupted program header size") == -1)
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return -1;
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return 0;
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}
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/*
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* Loop through all the program headers.
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*/
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for ( ; num; num--) {
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if ((savedoffset = lseek(fd, off, SEEK_SET)) == (off_t)-1) {
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file_badseek(ms);
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return -1;
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}
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if (read(fd, xph_addr, xph_sizeof) == -1) {
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file_badread(ms);
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return -1;
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}
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if (xph_offset > fsize) {
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if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
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file_badseek(ms);
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return -1;
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}
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continue;
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}
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off += size;
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if (xph_type != PT_NOTE)
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continue;
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/*
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* This is a PT_NOTE section; loop through all the notes
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* in the section.
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*/
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if (lseek(fd, xph_offset, SEEK_SET) == (off_t)-1) {
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file_badseek(ms);
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return -1;
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}
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bufsize = read(fd, nbuf,
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((xph_filesz < sizeof(nbuf)) ? xph_filesz : sizeof(nbuf)));
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if (bufsize == -1) {
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file_badread(ms);
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return -1;
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}
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offset = 0;
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for (;;) {
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if (offset >= (size_t)bufsize)
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break;
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offset = donote(ms, nbuf, offset, (size_t)bufsize,
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class, swap, 4, flags);
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if (offset == 0)
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break;
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}
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}
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return 0;
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}
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#endif
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private size_t
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donote(struct magic_set *ms, unsigned char *nbuf, size_t offset, size_t size,
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int class, int swap, size_t align, int *flags)
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{
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Elf32_Nhdr nh32;
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Elf64_Nhdr nh64;
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size_t noff, doff;
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#ifdef ELFCORE
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int os_style = -1;
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#endif
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uint32_t namesz, descsz;
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(void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
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offset += xnh_sizeof;
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namesz = xnh_namesz;
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descsz = xnh_descsz;
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if ((namesz == 0) && (descsz == 0)) {
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/*
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* We're out of note headers.
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*/
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return (offset >= size) ? offset : size;
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}
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if (namesz & 0x80000000) {
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(void)file_printf(ms, ", bad note name size 0x%lx",
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(unsigned long)namesz);
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return offset;
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}
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if (descsz & 0x80000000) {
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(void)file_printf(ms, ", bad note description size 0x%lx",
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(unsigned long)descsz);
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return offset;
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}
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noff = offset;
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doff = ELF_ALIGN(offset + namesz);
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if (offset + namesz > size) {
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/*
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* We're past the end of the buffer.
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*/
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return doff;
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}
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offset = ELF_ALIGN(doff + descsz);
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if (doff + descsz > size) {
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/*
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* We're past the end of the buffer.
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*/
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return (offset >= size) ? offset : size;
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}
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if (*flags & FLAGS_DID_NOTE)
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goto core;
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if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
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xnh_type == NT_GNU_VERSION && descsz == 16) {
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uint32_t desc[4];
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(void)memcpy(desc, &nbuf[doff], sizeof(desc));
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if (file_printf(ms, ", for GNU/") == -1)
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return size;
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switch (getu32(swap, desc[0])) {
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case GNU_OS_LINUX:
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if (file_printf(ms, "Linux") == -1)
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return size;
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break;
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case GNU_OS_HURD:
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if (file_printf(ms, "Hurd") == -1)
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return size;
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break;
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case GNU_OS_SOLARIS:
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if (file_printf(ms, "Solaris") == -1)
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return size;
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break;
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default:
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if (file_printf(ms, "<unknown>") == -1)
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return size;
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}
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if (file_printf(ms, " %d.%d.%d", getu32(swap, desc[1]),
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getu32(swap, desc[2]), getu32(swap, desc[3])) == -1)
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return size;
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*flags |= FLAGS_DID_NOTE;
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return size;
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}
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|
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if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0 &&
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xnh_type == NT_NETBSD_VERSION && descsz == 4) {
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uint32_t desc;
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(void)memcpy(&desc, &nbuf[doff], sizeof(desc));
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desc = getu32(swap, desc);
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|
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if (file_printf(ms, ", for NetBSD") == -1)
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return size;
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/*
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* The version number used to be stuck as 199905, and was thus
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* basically content-free. Newer versions of NetBSD have fixed
|
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* this and now use the encoding of __NetBSD_Version__:
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*
|
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* MMmmrrpp00
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|
*
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* M = major version
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|
* m = minor version
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* r = release ["",A-Z,Z[A-Z] but numeric]
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* p = patchlevel
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*/
|
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if (desc > 100000000U) {
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uint32_t ver_patch = (desc / 100) % 100;
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uint32_t ver_rel = (desc / 10000) % 100;
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uint32_t ver_min = (desc / 1000000) % 100;
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uint32_t ver_maj = desc / 100000000;
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|
|
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if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
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return size;
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|
if (ver_rel == 0 && ver_patch != 0) {
|
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if (file_printf(ms, ".%u", ver_patch) == -1)
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return size;
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} else if (ver_rel != 0) {
|
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while (ver_rel > 26) {
|
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if (file_printf(ms, "Z") == -1)
|
|
return size;
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|
ver_rel -= 26;
|
|
}
|
|
if (file_printf(ms, "%c", 'A' + ver_rel - 1)
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== -1)
|
|
return size;
|
|
}
|
|
}
|
|
*flags |= FLAGS_DID_NOTE;
|
|
return size;
|
|
}
|
|
|
|
if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0 &&
|
|
xnh_type == NT_FREEBSD_VERSION && descsz == 4) {
|
|
uint32_t desc;
|
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(void)memcpy(&desc, &nbuf[doff], sizeof(desc));
|
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desc = getu32(swap, desc);
|
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if (file_printf(ms, ", for FreeBSD") == -1)
|
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return size;
|
|
|
|
/*
|
|
* Contents is __FreeBSD_version, whose relation to OS
|
|
* versions is defined by a huge table in the Porter's
|
|
* Handbook. This is the general scheme:
|
|
*
|
|
* Releases:
|
|
* Mmp000 (before 4.10)
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|
* Mmi0p0 (before 5.0)
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|
* Mmm0p0
|
|
*
|
|
* Development branches:
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|
* Mmpxxx (before 4.6)
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|
* Mmp1xx (before 4.10)
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|
* Mmi1xx (before 5.0)
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|
* M000xx (pre-M.0)
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|
* Mmm1xx
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*
|
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* M = major version
|
|
* m = minor version
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|
* i = minor version increment (491000 -> 4.10)
|
|
* p = patchlevel
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|
* x = revision
|
|
*
|
|
* The first release of FreeBSD to use ELF by default
|
|
* was version 3.0.
|
|
*/
|
|
if (desc == 460002) {
|
|
if (file_printf(ms, " 4.6.2") == -1)
|
|
return size;
|
|
} else if (desc < 460100) {
|
|
if (file_printf(ms, " %d.%d", desc / 100000,
|
|
desc / 10000 % 10) == -1)
|
|
return size;
|
|
if (desc / 1000 % 10 > 0)
|
|
if (file_printf(ms, ".%d", desc / 1000 % 10)
|
|
== -1)
|
|
return size;
|
|
if ((desc % 1000 > 0) || (desc % 100000 == 0))
|
|
if (file_printf(ms, " (%d)", desc) == -1)
|
|
return size;
|
|
} else if (desc < 500000) {
|
|
if (file_printf(ms, " %d.%d", desc / 100000,
|
|
desc / 10000 % 10 + desc / 1000 % 10) == -1)
|
|
return size;
|
|
if (desc / 100 % 10 > 0) {
|
|
if (file_printf(ms, " (%d)", desc) == -1)
|
|
return size;
|
|
} else if (desc / 10 % 10 > 0) {
|
|
if (file_printf(ms, ".%d", desc / 10 % 10)
|
|
== -1)
|
|
return size;
|
|
}
|
|
} else {
|
|
if (file_printf(ms, " %d.%d", desc / 100000,
|
|
desc / 1000 % 100) == -1)
|
|
return size;
|
|
if ((desc / 100 % 10 > 0) ||
|
|
(desc % 100000 / 100 == 0)) {
|
|
if (file_printf(ms, " (%d)", desc) == -1)
|
|
return size;
|
|
} else if (desc / 10 % 10 > 0) {
|
|
if (file_printf(ms, ".%d", desc / 10 % 10)
|
|
== -1)
|
|
return size;
|
|
}
|
|
}
|
|
*flags |= FLAGS_DID_NOTE;
|
|
return size;
|
|
}
|
|
|
|
if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 &&
|
|
xnh_type == NT_OPENBSD_VERSION && descsz == 4) {
|
|
if (file_printf(ms, ", for OpenBSD") == -1)
|
|
return size;
|
|
/* Content of note is always 0 */
|
|
*flags |= FLAGS_DID_NOTE;
|
|
return size;
|
|
}
|
|
|
|
if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 &&
|
|
xnh_type == NT_DRAGONFLY_VERSION && descsz == 4) {
|
|
uint32_t desc;
|
|
if (file_printf(ms, ", for DragonFly") == -1)
|
|
return size;
|
|
(void)memcpy(&desc, &nbuf[doff], sizeof(desc));
|
|
desc = getu32(swap, desc);
|
|
if (file_printf(ms, " %d.%d.%d", desc / 100000,
|
|
desc / 10000 % 10, desc % 10000) == -1)
|
|
return size;
|
|
*flags |= FLAGS_DID_NOTE;
|
|
return size;
|
|
}
|
|
|
|
core:
|
|
/*
|
|
* Sigh. The 2.0.36 kernel in Debian 2.1, at
|
|
* least, doesn't correctly implement name
|
|
* sections, in core dumps, as specified by
|
|
* the "Program Linking" section of "UNIX(R) System
|
|
* V Release 4 Programmer's Guide: ANSI C and
|
|
* Programming Support Tools", because my copy
|
|
* clearly says "The first 'namesz' bytes in 'name'
|
|
* contain a *null-terminated* [emphasis mine]
|
|
* character representation of the entry's owner
|
|
* or originator", but the 2.0.36 kernel code
|
|
* doesn't include the terminating null in the
|
|
* name....
|
|
*/
|
|
if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) ||
|
|
(namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) {
|
|
os_style = OS_STYLE_SVR4;
|
|
}
|
|
|
|
if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) {
|
|
os_style = OS_STYLE_FREEBSD;
|
|
}
|
|
|
|
if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11)
|
|
== 0)) {
|
|
os_style = OS_STYLE_NETBSD;
|
|
}
|
|
|
|
#ifdef ELFCORE
|
|
if ((*flags & FLAGS_DID_CORE) != 0)
|
|
return size;
|
|
|
|
if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) {
|
|
if (file_printf(ms, ", %s-style", os_style_names[os_style])
|
|
== -1)
|
|
return size;
|
|
*flags |= FLAGS_DID_CORE_STYLE;
|
|
}
|
|
|
|
switch (os_style) {
|
|
case OS_STYLE_NETBSD:
|
|
if (xnh_type == NT_NETBSD_CORE_PROCINFO) {
|
|
uint32_t signo;
|
|
/*
|
|
* Extract the program name. It is at
|
|
* offset 0x7c, and is up to 32-bytes,
|
|
* including the terminating NUL.
|
|
*/
|
|
if (file_printf(ms, ", from '%.31s'",
|
|
&nbuf[doff + 0x7c]) == -1)
|
|
return size;
|
|
|
|
/*
|
|
* Extract the signal number. It is at
|
|
* offset 0x08.
|
|
*/
|
|
(void)memcpy(&signo, &nbuf[doff + 0x08],
|
|
sizeof(signo));
|
|
if (file_printf(ms, " (signal %u)",
|
|
getu32(swap, signo)) == -1)
|
|
return size;
|
|
*flags |= FLAGS_DID_CORE;
|
|
return size;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
if (xnh_type == NT_PRPSINFO) {
|
|
size_t i, j;
|
|
unsigned char c;
|
|
/*
|
|
* Extract the program name. We assume
|
|
* it to be 16 characters (that's what it
|
|
* is in SunOS 5.x and Linux).
|
|
*
|
|
* Unfortunately, it's at a different offset
|
|
* in various OSes, so try multiple offsets.
|
|
* If the characters aren't all printable,
|
|
* reject it.
|
|
*/
|
|
for (i = 0; i < NOFFSETS; i++) {
|
|
unsigned char *cname, *cp;
|
|
size_t reloffset = prpsoffsets(i);
|
|
size_t noffset = doff + reloffset;
|
|
for (j = 0; j < 16; j++, noffset++,
|
|
reloffset++) {
|
|
/*
|
|
* Make sure we're not past
|
|
* the end of the buffer; if
|
|
* we are, just give up.
|
|
*/
|
|
if (noffset >= size)
|
|
goto tryanother;
|
|
|
|
/*
|
|
* Make sure we're not past
|
|
* the end of the contents;
|
|
* if we are, this obviously
|
|
* isn't the right offset.
|
|
*/
|
|
if (reloffset >= descsz)
|
|
goto tryanother;
|
|
|
|
c = nbuf[noffset];
|
|
if (c == '\0') {
|
|
/*
|
|
* A '\0' at the
|
|
* beginning is
|
|
* obviously wrong.
|
|
* Any other '\0'
|
|
* means we're done.
|
|
*/
|
|
if (j == 0)
|
|
goto tryanother;
|
|
else
|
|
break;
|
|
} else {
|
|
/*
|
|
* A nonprintable
|
|
* character is also
|
|
* wrong.
|
|
*/
|
|
if (!isprint(c) || isquote(c))
|
|
goto tryanother;
|
|
}
|
|
}
|
|
/*
|
|
* Well, that worked.
|
|
*/
|
|
cname = (unsigned char *)
|
|
&nbuf[doff + prpsoffsets(i)];
|
|
for (cp = cname; *cp && isprint(*cp); cp++)
|
|
continue;
|
|
if (cp > cname)
|
|
cp--;
|
|
if (file_printf(ms, ", from '%.*s'",
|
|
(int)(cp - cname), cname) == -1)
|
|
return size;
|
|
*flags |= FLAGS_DID_CORE;
|
|
return size;
|
|
|
|
tryanother:
|
|
;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
#endif
|
|
return offset;
|
|
}
|
|
|
|
private int
|
|
doshn(struct magic_set *ms, int class, int swap, int fd, off_t off, int num,
|
|
size_t size, int *flags)
|
|
{
|
|
Elf32_Shdr sh32;
|
|
Elf64_Shdr sh64;
|
|
int stripped = 1;
|
|
void *nbuf;
|
|
off_t noff;
|
|
|
|
if (size != xsh_sizeof) {
|
|
if (file_printf(ms, ", corrupted section header size") == -1)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
if (lseek(fd, off, SEEK_SET) == (off_t)-1) {
|
|
file_badseek(ms);
|
|
return -1;
|
|
}
|
|
|
|
for ( ; num; num--) {
|
|
if (read(fd, xsh_addr, xsh_sizeof) == -1) {
|
|
file_badread(ms);
|
|
return -1;
|
|
}
|
|
switch (xsh_type) {
|
|
case SHT_SYMTAB:
|
|
#if 0
|
|
case SHT_DYNSYM:
|
|
#endif
|
|
stripped = 0;
|
|
break;
|
|
case SHT_NOTE:
|
|
if ((off = lseek(fd, (off_t)0, SEEK_CUR)) ==
|
|
(off_t)-1) {
|
|
file_badread(ms);
|
|
return -1;
|
|
}
|
|
if ((nbuf = malloc((size_t)xsh_size)) == NULL) {
|
|
file_error(ms, errno, "Cannot allocate memory"
|
|
" for note");
|
|
return -1;
|
|
}
|
|
if ((noff = lseek(fd, (off_t)xsh_offset, SEEK_SET)) ==
|
|
(off_t)-1) {
|
|
file_badread(ms);
|
|
free(nbuf);
|
|
return -1;
|
|
}
|
|
if (read(fd, nbuf, (size_t)xsh_size) !=
|
|
(ssize_t)xsh_size) {
|
|
free(nbuf);
|
|
file_badread(ms);
|
|
return -1;
|
|
}
|
|
|
|
noff = 0;
|
|
for (;;) {
|
|
if (noff >= (size_t)xsh_size)
|
|
break;
|
|
noff = donote(ms, nbuf, (size_t)noff,
|
|
(size_t)xsh_size, class, swap, 4,
|
|
flags);
|
|
if (noff == 0)
|
|
break;
|
|
}
|
|
if ((lseek(fd, off, SEEK_SET)) == (off_t)-1) {
|
|
free(nbuf);
|
|
file_badread(ms);
|
|
return -1;
|
|
}
|
|
free(nbuf);
|
|
break;
|
|
}
|
|
}
|
|
if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Look through the program headers of an executable image, searching
|
|
* for a PT_INTERP section; if one is found, it's dynamically linked,
|
|
* otherwise it's statically linked.
|
|
*/
|
|
private int
|
|
dophn_exec(struct magic_set *ms, int class, int swap, int fd, off_t off,
|
|
int num, size_t size, off_t fsize, int *flags)
|
|
{
|
|
Elf32_Phdr ph32;
|
|
Elf64_Phdr ph64;
|
|
const char *linking_style = "statically";
|
|
const char *shared_libraries = "";
|
|
unsigned char nbuf[BUFSIZ];
|
|
int bufsize;
|
|
size_t offset, align;
|
|
off_t savedoffset = (off_t)-1;
|
|
struct stat st;
|
|
|
|
if (fstat(fd, &st) < 0) {
|
|
file_badread(ms);
|
|
return -1;
|
|
}
|
|
|
|
if (size != xph_sizeof) {
|
|
if (file_printf(ms, ", corrupted program header size") == -1)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
if (lseek(fd, off, SEEK_SET) == (off_t)-1) {
|
|
file_badseek(ms);
|
|
return -1;
|
|
}
|
|
|
|
for ( ; num; num--) {
|
|
if (read(fd, xph_addr, xph_sizeof) == -1) {
|
|
file_badread(ms);
|
|
return -1;
|
|
}
|
|
if (xph_offset > st.st_size && savedoffset != (off_t)-1) {
|
|
if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
|
|
file_badseek(ms);
|
|
return -1;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
if ((savedoffset = lseek(fd, (off_t)0, SEEK_CUR)) == (off_t)-1) {
|
|
file_badseek(ms);
|
|
return -1;
|
|
}
|
|
|
|
if (xph_offset > fsize) {
|
|
if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
|
|
file_badseek(ms);
|
|
return -1;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
switch (xph_type) {
|
|
case PT_DYNAMIC:
|
|
linking_style = "dynamically";
|
|
break;
|
|
case PT_INTERP:
|
|
shared_libraries = " (uses shared libs)";
|
|
break;
|
|
case PT_NOTE:
|
|
if ((align = xph_align) & 0x80000000) {
|
|
if (file_printf(ms,
|
|
", invalid note alignment 0x%lx",
|
|
(unsigned long)align) == -1)
|
|
return -1;
|
|
align = 4;
|
|
}
|
|
/*
|
|
* This is a PT_NOTE section; loop through all the notes
|
|
* in the section.
|
|
*/
|
|
if (lseek(fd, xph_offset, SEEK_SET)
|
|
== (off_t)-1) {
|
|
file_badseek(ms);
|
|
return -1;
|
|
}
|
|
bufsize = read(fd, nbuf, ((xph_filesz < sizeof(nbuf)) ?
|
|
xph_filesz : sizeof(nbuf)));
|
|
if (bufsize == -1) {
|
|
file_badread(ms);
|
|
return -1;
|
|
}
|
|
offset = 0;
|
|
for (;;) {
|
|
if (offset >= (size_t)bufsize)
|
|
break;
|
|
offset = donote(ms, nbuf, offset,
|
|
(size_t)bufsize, class, swap, align,
|
|
flags);
|
|
if (offset == 0)
|
|
break;
|
|
}
|
|
if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
|
|
file_badseek(ms);
|
|
return -1;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
if (file_printf(ms, ", %s linked%s", linking_style, shared_libraries)
|
|
== -1)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
|
|
protected int
|
|
file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf,
|
|
size_t nbytes)
|
|
{
|
|
union {
|
|
int32_t l;
|
|
char c[sizeof (int32_t)];
|
|
} u;
|
|
int class;
|
|
int swap;
|
|
struct stat st;
|
|
off_t fsize;
|
|
int flags = 0;
|
|
|
|
/*
|
|
* If we cannot seek, it must be a pipe, socket or fifo.
|
|
*/
|
|
if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE))
|
|
fd = file_pipe2file(ms, fd, buf, nbytes);
|
|
|
|
if (fstat(fd, &st) == -1) {
|
|
file_badread(ms);
|
|
return -1;
|
|
}
|
|
fsize = st.st_size;
|
|
|
|
/*
|
|
* ELF executables have multiple section headers in arbitrary
|
|
* file locations and thus file(1) cannot determine it from easily.
|
|
* Instead we traverse thru all section headers until a symbol table
|
|
* one is found or else the binary is stripped.
|
|
*/
|
|
if (buf[EI_MAG0] != ELFMAG0
|
|
|| (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
|
|
|| buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
|
|
return 0;
|
|
|
|
|
|
class = buf[EI_CLASS];
|
|
|
|
if (class == ELFCLASS32) {
|
|
Elf32_Ehdr elfhdr;
|
|
uint16_t type;
|
|
|
|
if (nbytes <= sizeof (Elf32_Ehdr))
|
|
return 0;
|
|
|
|
|
|
u.l = 1;
|
|
(void) memcpy(&elfhdr, buf, sizeof elfhdr);
|
|
swap = (u.c[sizeof(int32_t) - 1] + 1) != elfhdr.e_ident[EI_DATA];
|
|
|
|
type = getu16(swap, elfhdr.e_type);
|
|
switch (type) {
|
|
#ifdef ELFCORE
|
|
case ET_CORE:
|
|
if (dophn_core(ms, class, swap, fd,
|
|
(off_t)getu32(swap, elfhdr.e_phoff),
|
|
getu16(swap, elfhdr.e_phnum),
|
|
(size_t)getu16(swap, elfhdr.e_phentsize),
|
|
fsize, &flags) == -1)
|
|
return -1;
|
|
break;
|
|
#endif
|
|
case ET_EXEC:
|
|
case ET_DYN:
|
|
if (dophn_exec(ms, class, swap,
|
|
fd, (off_t)getu32(swap, elfhdr.e_phoff),
|
|
getu16(swap, elfhdr.e_phnum),
|
|
(size_t)getu16(swap, elfhdr.e_phentsize),
|
|
fsize, &flags) == -1)
|
|
return -1;
|
|
if (doshn(ms, class, swap, fd,
|
|
(off_t)getu32(swap, elfhdr.e_shoff),
|
|
getu16(swap, elfhdr.e_shnum),
|
|
(size_t)getu16(swap, elfhdr.e_shentsize),
|
|
&flags) == -1)
|
|
return -1;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
if (class == ELFCLASS64) {
|
|
Elf64_Ehdr elfhdr;
|
|
if (nbytes <= sizeof (Elf64_Ehdr))
|
|
return 0;
|
|
|
|
|
|
u.l = 1;
|
|
(void) memcpy(&elfhdr, buf, sizeof elfhdr);
|
|
swap = (u.c[sizeof(int32_t) - 1] + 1) != elfhdr.e_ident[EI_DATA];
|
|
|
|
if (getu16(swap, elfhdr.e_type) == ET_CORE) {
|
|
#ifdef ELFCORE
|
|
if (dophn_core(ms, class, swap, fd,
|
|
(off_t)elf_getu64(swap, elfhdr.e_phoff),
|
|
getu16(swap, elfhdr.e_phnum),
|
|
(size_t)getu16(swap, elfhdr.e_phentsize),
|
|
fsize, &flags) == -1)
|
|
return -1;
|
|
#else
|
|
;
|
|
#endif
|
|
} else {
|
|
if (getu16(swap, elfhdr.e_type) == ET_EXEC) {
|
|
if (dophn_exec(ms, class, swap, fd,
|
|
(off_t)elf_getu64(swap, elfhdr.e_phoff),
|
|
getu16(swap, elfhdr.e_phnum),
|
|
(size_t)getu16(swap, elfhdr.e_phentsize),
|
|
fsize, &flags) == -1)
|
|
return -1;
|
|
}
|
|
if (doshn(ms, class, swap, fd,
|
|
(off_t)elf_getu64(swap, elfhdr.e_shoff),
|
|
getu16(swap, elfhdr.e_shnum),
|
|
(size_t)getu16(swap, elfhdr.e_shentsize), &flags)
|
|
== -1)
|
|
return -1;
|
|
}
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|