ea8dc7e0f2
*- file is now broken into a library containing and processing the magic and a consumer binary.
845 lines
21 KiB
C
845 lines
21 KiB
C
/*
|
|
* Copyright (c) Christos Zoulas 2003.
|
|
* 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 immediately at the beginning of the file, without modification,
|
|
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
|
|
*/
|
|
#include "file.h"
|
|
|
|
#ifdef BUILTIN_ELF
|
|
#include <string.h>
|
|
#include <ctype.h>
|
|
#include <stdlib.h>
|
|
#ifdef HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
|
|
#include "readelf.h"
|
|
|
|
#ifndef lint
|
|
FILE_RCSID("@(#)$Id: readelf.c,v 1.42 2004/07/24 20:57:22 christos Exp $")
|
|
#endif
|
|
|
|
#ifdef ELFCORE
|
|
private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t);
|
|
#endif
|
|
private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t);
|
|
private int doshn(struct magic_set *, int, int, int, off_t, int, size_t);
|
|
private size_t donote(struct magic_set *, unsigned char *, size_t, size_t, int,
|
|
int, size_t);
|
|
|
|
#define ELF_ALIGN(a) ((((a) + align - 1) / align) * align)
|
|
|
|
private uint16_t getu16(int, uint16_t);
|
|
private uint32_t getu32(int, uint32_t);
|
|
private uint64_t getu64(int, uint64_t);
|
|
|
|
private uint16_t
|
|
getu16(int swap, uint16_t value)
|
|
{
|
|
union {
|
|
uint16_t ui;
|
|
char c[2];
|
|
} retval, tmpval;
|
|
|
|
if (swap) {
|
|
tmpval.ui = value;
|
|
|
|
retval.c[0] = tmpval.c[1];
|
|
retval.c[1] = tmpval.c[0];
|
|
|
|
return retval.ui;
|
|
} else
|
|
return value;
|
|
}
|
|
|
|
private uint32_t
|
|
getu32(int swap, uint32_t value)
|
|
{
|
|
union {
|
|
uint32_t ui;
|
|
char c[4];
|
|
} retval, tmpval;
|
|
|
|
if (swap) {
|
|
tmpval.ui = value;
|
|
|
|
retval.c[0] = tmpval.c[3];
|
|
retval.c[1] = tmpval.c[2];
|
|
retval.c[2] = tmpval.c[1];
|
|
retval.c[3] = tmpval.c[0];
|
|
|
|
return retval.ui;
|
|
} else
|
|
return value;
|
|
}
|
|
|
|
private uint64_t
|
|
getu64(int swap, uint64_t value)
|
|
{
|
|
union {
|
|
uint64_t ui;
|
|
char c[8];
|
|
} retval, tmpval;
|
|
|
|
if (swap) {
|
|
tmpval.ui = value;
|
|
|
|
retval.c[0] = tmpval.c[7];
|
|
retval.c[1] = tmpval.c[6];
|
|
retval.c[2] = tmpval.c[5];
|
|
retval.c[3] = tmpval.c[4];
|
|
retval.c[4] = tmpval.c[3];
|
|
retval.c[5] = tmpval.c[2];
|
|
retval.c[6] = tmpval.c[1];
|
|
retval.c[7] = tmpval.c[0];
|
|
|
|
return retval.ui;
|
|
} else
|
|
return value;
|
|
}
|
|
|
|
#define sh_addr (class == ELFCLASS32 \
|
|
? (void *) &sh32 \
|
|
: (void *) &sh64)
|
|
#define sh_size (class == ELFCLASS32 \
|
|
? sizeof sh32 \
|
|
: sizeof sh64)
|
|
#define shs_type (class == ELFCLASS32 \
|
|
? getu32(swap, sh32.sh_type) \
|
|
: getu32(swap, sh64.sh_type))
|
|
#define ph_addr (class == ELFCLASS32 \
|
|
? (void *) &ph32 \
|
|
: (void *) &ph64)
|
|
#define ph_size (class == ELFCLASS32 \
|
|
? sizeof ph32 \
|
|
: sizeof ph64)
|
|
#define ph_type (class == ELFCLASS32 \
|
|
? getu32(swap, ph32.p_type) \
|
|
: getu32(swap, ph64.p_type))
|
|
#define ph_offset (class == ELFCLASS32 \
|
|
? getu32(swap, ph32.p_offset) \
|
|
: getu64(swap, ph64.p_offset))
|
|
#define ph_align (size_t)((class == ELFCLASS32 \
|
|
? (off_t) (ph32.p_align ? \
|
|
getu32(swap, ph32.p_align) : 4) \
|
|
: (off_t) (ph64.p_align ? \
|
|
getu64(swap, ph64.p_align) : 4)))
|
|
#define ph_filesz (size_t)((class == ELFCLASS32 \
|
|
? getu32(swap, ph32.p_filesz) \
|
|
: getu64(swap, ph64.p_filesz)))
|
|
#define ph_memsz (size_t)((class == ELFCLASS32 \
|
|
? getu32(swap, ph32.p_memsz) \
|
|
: getu64(swap, ph64.p_memsz)))
|
|
#define nh_size (class == ELFCLASS32 \
|
|
? sizeof nh32 \
|
|
: sizeof nh64)
|
|
#define nh_type (class == ELFCLASS32 \
|
|
? getu32(swap, nh32.n_type) \
|
|
: getu32(swap, nh64.n_type))
|
|
#define nh_namesz (class == ELFCLASS32 \
|
|
? getu32(swap, nh32.n_namesz) \
|
|
: getu32(swap, nh64.n_namesz))
|
|
#define nh_descsz (class == ELFCLASS32 \
|
|
? getu32(swap, nh32.n_descsz) \
|
|
: getu32(swap, nh64.n_descsz))
|
|
#define prpsoffsets(i) (class == ELFCLASS32 \
|
|
? prpsoffsets32[i] \
|
|
: prpsoffsets64[i])
|
|
|
|
#ifdef ELFCORE
|
|
size_t prpsoffsets32[] = {
|
|
8, /* FreeBSD */
|
|
28, /* Linux 2.0.36 */
|
|
32, /* Linux (I forget which kernel version) */
|
|
84, /* SunOS 5.x */
|
|
};
|
|
|
|
size_t prpsoffsets64[] = {
|
|
120, /* SunOS 5.x, 64-bit */
|
|
};
|
|
|
|
#define NOFFSETS32 (sizeof prpsoffsets32 / sizeof prpsoffsets32[0])
|
|
#define NOFFSETS64 (sizeof prpsoffsets64 / sizeof prpsoffsets64[0])
|
|
|
|
#define NOFFSETS (class == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64)
|
|
|
|
/*
|
|
* Look through the program headers of an executable image, searching
|
|
* for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or
|
|
* "FreeBSD"; if one is found, try looking in various places in its
|
|
* contents for a 16-character string containing only printable
|
|
* characters - if found, that string should be the name of the program
|
|
* that dropped core. Note: right after that 16-character string is,
|
|
* at least in SunOS 5.x (and possibly other SVR4-flavored systems) and
|
|
* Linux, a longer string (80 characters, in 5.x, probably other
|
|
* SVR4-flavored systems, and Linux) containing the start of the
|
|
* command line for that program.
|
|
*
|
|
* The signal number probably appears in a section of type NT_PRSTATUS,
|
|
* but that's also rather OS-dependent, in ways that are harder to
|
|
* dissect with heuristics, so I'm not bothering with the signal number.
|
|
* (I suppose the signal number could be of interest in situations where
|
|
* you don't have the binary of the program that dropped core; if you
|
|
* *do* have that binary, the debugger will probably tell you what
|
|
* signal it was.)
|
|
*/
|
|
|
|
#define OS_STYLE_SVR4 0
|
|
#define OS_STYLE_FREEBSD 1
|
|
#define OS_STYLE_NETBSD 2
|
|
|
|
private const char *os_style_names[] = {
|
|
"SVR4",
|
|
"FreeBSD",
|
|
"NetBSD",
|
|
};
|
|
|
|
private int
|
|
dophn_core(struct magic_set *ms, int class, int swap, int fd, off_t off,
|
|
int num, size_t size)
|
|
{
|
|
Elf32_Phdr ph32;
|
|
Elf64_Phdr ph64;
|
|
size_t offset;
|
|
unsigned char nbuf[BUFSIZ];
|
|
ssize_t bufsize;
|
|
|
|
if (size != ph_size) {
|
|
if (file_printf(ms, ", corrupted program header size") == -1)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
/*
|
|
* Loop through all the program headers.
|
|
*/
|
|
for ( ; num; num--) {
|
|
if (lseek(fd, off, SEEK_SET) == (off_t)-1) {
|
|
file_badseek(ms);
|
|
return -1;
|
|
}
|
|
if (read(fd, ph_addr, ph_size) == -1) {
|
|
file_badread(ms);
|
|
return -1;
|
|
}
|
|
off += size;
|
|
if (ph_type != PT_NOTE)
|
|
continue;
|
|
|
|
/*
|
|
* This is a PT_NOTE section; loop through all the notes
|
|
* in the section.
|
|
*/
|
|
if (lseek(fd, (off_t) ph_offset, SEEK_SET) == (off_t)-1) {
|
|
file_badseek(ms);
|
|
return -1;
|
|
}
|
|
bufsize = read(fd, nbuf, 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, 4);
|
|
if (offset == 0)
|
|
break;
|
|
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
private size_t
|
|
donote(struct magic_set *ms, unsigned char *nbuf, size_t offset, size_t size,
|
|
int class, int swap, size_t align)
|
|
{
|
|
Elf32_Nhdr nh32;
|
|
Elf64_Nhdr nh64;
|
|
size_t noff, doff;
|
|
#ifdef ELFCORE
|
|
int os_style = -1;
|
|
#endif
|
|
uint32_t namesz, descsz;
|
|
|
|
if (class == ELFCLASS32)
|
|
memcpy(&nh32, &nbuf[offset], sizeof(nh32));
|
|
else
|
|
memcpy(&nh64, &nbuf[offset], sizeof(nh64));
|
|
offset += nh_size;
|
|
|
|
namesz = nh_namesz;
|
|
descsz = nh_descsz;
|
|
if ((namesz == 0) && (descsz == 0)) {
|
|
/*
|
|
* We're out of note headers.
|
|
*/
|
|
return offset;
|
|
}
|
|
|
|
if (namesz & 0x80000000) {
|
|
(void)file_printf(ms, ", bad note name size 0x%lx",
|
|
(unsigned long)namesz);
|
|
return offset;
|
|
}
|
|
|
|
if (descsz & 0x80000000) {
|
|
(void)file_printf(ms, ", bad note description size 0x%lx",
|
|
(unsigned long)descsz);
|
|
return offset;
|
|
}
|
|
|
|
|
|
noff = offset;
|
|
doff = ELF_ALIGN(offset + namesz);
|
|
|
|
if (offset + namesz > size) {
|
|
/*
|
|
* We're past the end of the buffer.
|
|
*/
|
|
return doff;
|
|
}
|
|
|
|
offset = ELF_ALIGN(doff + descsz);
|
|
if (offset + descsz > size) {
|
|
return offset;
|
|
}
|
|
|
|
if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
|
|
nh_type == NT_GNU_VERSION && descsz == 16) {
|
|
uint32_t desc[4];
|
|
(void)memcpy(desc, &nbuf[doff], sizeof(desc));
|
|
|
|
if (file_printf(ms, ", for GNU/") == -1)
|
|
return size;
|
|
switch (getu32(swap, desc[0])) {
|
|
case GNU_OS_LINUX:
|
|
if (file_printf(ms, "Linux") == -1)
|
|
return size;
|
|
break;
|
|
case GNU_OS_HURD:
|
|
if (file_printf(ms, "Hurd") == -1)
|
|
return size;
|
|
break;
|
|
case GNU_OS_SOLARIS:
|
|
if (file_printf(ms, "Solaris") == -1)
|
|
return size;
|
|
break;
|
|
default:
|
|
if (file_printf(ms, "<unknown>") == -1)
|
|
return size;
|
|
}
|
|
if (file_printf(ms, " %d.%d.%d", getu32(swap, desc[1]),
|
|
getu32(swap, desc[2]), getu32(swap, desc[3])) == -1)
|
|
return size;
|
|
return size;
|
|
}
|
|
|
|
if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0 &&
|
|
nh_type == NT_NETBSD_VERSION && descsz == 4) {
|
|
uint32_t desc;
|
|
(void)memcpy(&desc, &nbuf[doff], sizeof(desc));
|
|
desc = getu32(swap, desc);
|
|
|
|
if (file_printf(ms, ", for NetBSD") == -1)
|
|
return size;
|
|
/*
|
|
* The version number used to be stuck as 199905, and was thus
|
|
* basically content-free. Newer versions of NetBSD have fixed
|
|
* this and now use the encoding of __NetBSD_Version__:
|
|
*
|
|
* MMmmrrpp00
|
|
*
|
|
* M = major version
|
|
* m = minor version
|
|
* r = release ["",A-Z,Z[A-Z] but numeric]
|
|
* p = patchlevel
|
|
*/
|
|
if (desc > 100000000U) {
|
|
u_int ver_patch = (desc / 100) % 100;
|
|
u_int ver_rel = (desc / 10000) % 100;
|
|
u_int ver_min = (desc / 1000000) % 100;
|
|
u_int ver_maj = desc / 100000000;
|
|
|
|
if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
|
|
return size;
|
|
if (ver_rel == 0 && ver_patch != 0) {
|
|
if (file_printf(ms, ".%u", ver_patch) == -1)
|
|
return size;
|
|
} else if (ver_rel != 0) {
|
|
while (ver_rel > 26) {
|
|
file_printf(ms, "Z");
|
|
ver_rel -= 26;
|
|
}
|
|
file_printf(ms, "%c", 'A' + ver_rel - 1);
|
|
}
|
|
}
|
|
return size;
|
|
}
|
|
|
|
if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0 &&
|
|
nh_type == NT_FREEBSD_VERSION && descsz == 4) {
|
|
uint32_t desc;
|
|
(void)memcpy(&desc, &nbuf[doff], sizeof(desc));
|
|
desc = getu32(swap, desc);
|
|
if (file_printf(ms, ", for FreeBSD") == -1)
|
|
return size;
|
|
|
|
/*
|
|
* Contents is __FreeBSD_version, whose relation to OS
|
|
* versions is defined by a huge table in the Porters'
|
|
* Handbook. For up to 5.x, the first three digits are
|
|
* the version number. For 5.x and higher, the scheme
|
|
* is: <major><two digit minor> <0 if release branch,
|
|
* otherwise 1>xx
|
|
*/
|
|
if (desc / 100000 < 5) {
|
|
if (desc / 10000 % 10 == 9) {
|
|
if (file_printf(ms, " %d.%d", desc / 100000,
|
|
9 + desc / 1000 % 10) == -1)
|
|
return size;
|
|
} else {
|
|
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 / 10000 % 10 > 5) {
|
|
desc %= 1000;
|
|
if (desc >= 100) {
|
|
if (file_printf(ms, "-STABLE (rev %d)",
|
|
desc % 100) == -1)
|
|
return size;
|
|
} else if (desc != 0) {
|
|
if (file_printf(ms, ".%d", desc) == -1)
|
|
return size;
|
|
}
|
|
}
|
|
} else {
|
|
if (file_printf(ms, " %d.%d", desc / 100000,
|
|
desc / 1000 % 100) == -1)
|
|
return size;
|
|
desc %= 1000;
|
|
if (desc >= 100) {
|
|
if (file_printf(ms, "-CURRENT (rev %d)",
|
|
desc % 100) == -1)
|
|
return size;
|
|
} else if (desc != 0) {
|
|
if (file_printf(ms, ".%d", desc / 10) == -1)
|
|
return size;
|
|
}
|
|
}
|
|
return size;
|
|
}
|
|
|
|
if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 &&
|
|
nh_type == NT_OPENBSD_VERSION && descsz == 4) {
|
|
if (file_printf(ms, ", for OpenBSD") == -1)
|
|
return size;
|
|
/* Content of note is always 0 */
|
|
return size;
|
|
}
|
|
|
|
/*
|
|
* 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 (os_style != -1)
|
|
if (file_printf(ms, ", %s-style", os_style_names[os_style]) == -1)
|
|
return size;
|
|
|
|
if (os_style == OS_STYLE_NETBSD && nh_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.
|
|
*/
|
|
memcpy(&signo, &nbuf[doff + 0x08],
|
|
sizeof(signo));
|
|
if (file_printf(ms, " (signal %u)", getu32(swap, signo)) == -1)
|
|
return size;
|
|
return size;
|
|
} else if (os_style != OS_STYLE_NETBSD && nh_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 varous OSes, so try multiple offsets.
|
|
* If the characters aren't all printable,
|
|
* reject it.
|
|
*/
|
|
for (i = 0; i < NOFFSETS; i++) {
|
|
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.
|
|
*/
|
|
#define isquote(c) (strchr("'\"`", (c)) != NULL)
|
|
if (!isprint(c) || isquote(c))
|
|
goto tryanother;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Well, that worked.
|
|
*/
|
|
if (file_printf(ms, ", from '%.16s'",
|
|
&nbuf[doff + prpsoffsets(i)]) == -1)
|
|
return size;
|
|
return size;
|
|
|
|
tryanother:
|
|
;
|
|
}
|
|
return offset;
|
|
}
|
|
#endif
|
|
return offset;
|
|
}
|
|
|
|
private int
|
|
doshn(struct magic_set *ms, int class, int swap, int fd, off_t off, int num,
|
|
size_t size)
|
|
{
|
|
Elf32_Shdr sh32;
|
|
Elf64_Shdr sh64;
|
|
|
|
if (size != sh_size) {
|
|
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, sh_addr, sh_size) == -1) {
|
|
file_badread(ms);
|
|
return -1;
|
|
}
|
|
if (shs_type == SHT_SYMTAB /* || shs_type == SHT_DYNSYM */) {
|
|
if (file_printf(ms, ", not stripped") == -1)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
}
|
|
if (file_printf(ms, ", stripped") == -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)
|
|
{
|
|
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;
|
|
|
|
if (size != ph_size) {
|
|
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, ph_addr, ph_size) == -1) {
|
|
file_badread(ms);
|
|
return -1;
|
|
}
|
|
if ((savedoffset = lseek(fd, (off_t)0, SEEK_CUR)) == (off_t)-1) {
|
|
file_badseek(ms);
|
|
return -1;
|
|
}
|
|
|
|
switch (ph_type) {
|
|
case PT_DYNAMIC:
|
|
linking_style = "dynamically";
|
|
break;
|
|
case PT_INTERP:
|
|
shared_libraries = " (uses shared libs)";
|
|
break;
|
|
case PT_NOTE:
|
|
if ((align = ph_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, (off_t) ph_offset, SEEK_SET)
|
|
== (off_t)-1) {
|
|
file_badseek(ms);
|
|
return -1;
|
|
}
|
|
bufsize = read(fd, nbuf, 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);
|
|
if (offset == 0)
|
|
break;
|
|
}
|
|
if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
|
|
file_badseek(ms);
|
|
return -1;
|
|
}
|
|
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;
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/*
|
|
* 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[4];
|
|
|
|
if (class == ELFCLASS32) {
|
|
Elf32_Ehdr elfhdr;
|
|
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[5];
|
|
|
|
if (getu16(swap, elfhdr.e_type) == ET_CORE) {
|
|
#ifdef ELFCORE
|
|
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)) == -1)
|
|
return -1;
|
|
#else
|
|
;
|
|
#endif
|
|
} else {
|
|
if (getu16(swap, elfhdr.e_type) == ET_EXEC) {
|
|
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))
|
|
== -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)) == -1)
|
|
return -1;
|
|
}
|
|
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[5];
|
|
|
|
if (getu16(swap, elfhdr.e_type) == ET_CORE) {
|
|
#ifdef ELFCORE
|
|
if (dophn_core(ms, class, swap, fd,
|
|
#ifdef USE_ARRAY_FOR_64BIT_TYPES
|
|
(off_t)getu32(swap, elfhdr.e_phoff[1]),
|
|
#else
|
|
(off_t)getu64(swap, elfhdr.e_phoff),
|
|
#endif
|
|
getu16(swap, elfhdr.e_phnum),
|
|
(size_t)getu16(swap, elfhdr.e_phentsize)) == -1)
|
|
return -1;
|
|
#else
|
|
;
|
|
#endif
|
|
} else {
|
|
if (getu16(swap, elfhdr.e_type) == ET_EXEC) {
|
|
if (dophn_exec(ms, class, swap, fd,
|
|
#ifdef USE_ARRAY_FOR_64BIT_TYPES
|
|
(off_t)getu32(swap, elfhdr.e_phoff[1]),
|
|
#else
|
|
(off_t)getu64(swap, elfhdr.e_phoff),
|
|
#endif
|
|
getu16(swap, elfhdr.e_phnum),
|
|
(size_t)getu16(swap, elfhdr.e_phentsize))
|
|
== -1)
|
|
return -1;
|
|
}
|
|
if (doshn(ms, class, swap, fd,
|
|
#ifdef USE_ARRAY_FOR_64BIT_TYPES
|
|
(off_t)getu32(swap, elfhdr.e_shoff[1]),
|
|
#else
|
|
(off_t)getu64(swap, elfhdr.e_shoff),
|
|
#endif
|
|
getu16(swap, elfhdr.e_shnum),
|
|
(size_t)getu16(swap, elfhdr.e_shentsize)) == -1)
|
|
return -1;
|
|
}
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|