/*
* 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.
*
* 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"
#ifndef lint
FILE_RCSID("@(#)$File: readelf.c,v 1.173 2020/06/07 22:12:54 christos Exp $")
#endif
#ifdef BUILTIN_ELF
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "readelf.h"
#include "magic.h"
#ifdef ELFCORE
private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t,
off_t, int *, uint16_t *);
#endif
private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t,
off_t, int, int *, uint16_t *);
private int doshn(struct magic_set *, int, int, int, off_t, int, size_t,
off_t, int, int, int *, uint16_t *);
private size_t donote(struct magic_set *, void *, size_t, size_t, int,
int, size_t, int *, uint16_t *, int, off_t, int, off_t);
#define ELF_ALIGN(a) ((((a) + align - 1) / align) * align)
#define isquote(c) (strchr("'\"`", (c)) != NULL)
private uint16_t getu16(int, uint16_t);
private uint32_t getu32(int, uint32_t);
private uint64_t getu64(int, uint64_t);
#define MAX_PHNUM 128
#define MAX_SHNUM 32768
#define SIZE_UNKNOWN CAST(off_t, -1)
private int
toomany(struct magic_set *ms, const char *name, uint16_t num)
{
if (ms->flags & MAGIC_MIME)
return 1;
if (file_printf(ms, ", too many %s (%u)", name, num) == -1)
return -1;
return 1;
}
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 elf_getu16(swap, value) getu16(swap, value)
#define elf_getu32(swap, value) getu32(swap, value)
#define elf_getu64(swap, value) getu64(swap, value)
#define xsh_addr (clazz == ELFCLASS32 \
? CAST(void *, &sh32) \
: CAST(void *, &sh64))
#define xsh_sizeof (clazz == ELFCLASS32 \
? sizeof(sh32) \
: sizeof(sh64))
#define xsh_size CAST(size_t, (clazz == ELFCLASS32 \
? elf_getu32(swap, sh32.sh_size) \
: elf_getu64(swap, sh64.sh_size)))
#define xsh_offset CAST(off_t, (clazz == ELFCLASS32 \
? elf_getu32(swap, sh32.sh_offset) \
: elf_getu64(swap, sh64.sh_offset)))
#define xsh_type (clazz == ELFCLASS32 \
? elf_getu32(swap, sh32.sh_type) \
: elf_getu32(swap, sh64.sh_type))
#define xsh_name (clazz == ELFCLASS32 \
? elf_getu32(swap, sh32.sh_name) \
: elf_getu32(swap, sh64.sh_name))
#define xph_addr (clazz == ELFCLASS32 \
? CAST(void *, &ph32) \
: CAST(void *, &ph64))
#define xph_sizeof (clazz == ELFCLASS32 \
? sizeof(ph32) \
: sizeof(ph64))
#define xph_type (clazz == ELFCLASS32 \
? elf_getu32(swap, ph32.p_type) \
: elf_getu32(swap, ph64.p_type))
#define xph_offset CAST(off_t, (clazz == ELFCLASS32 \
? elf_getu32(swap, ph32.p_offset) \
: elf_getu64(swap, ph64.p_offset)))
#define xph_align CAST(size_t, (clazz == ELFCLASS32 \
? CAST(off_t, (ph32.p_align ? \
elf_getu32(swap, ph32.p_align) : 4))\
: CAST(off_t, (ph64.p_align ? \
elf_getu64(swap, ph64.p_align) : 4))))
#define xph_vaddr CAST(size_t, (clazz == ELFCLASS32 \
? CAST(off_t, (ph32.p_vaddr ? \
elf_getu32(swap, ph32.p_vaddr) : 4))\
: CAST(off_t, (ph64.p_vaddr ? \
elf_getu64(swap, ph64.p_vaddr) : 4))))
#define xph_filesz CAST(size_t, (clazz == ELFCLASS32 \
? elf_getu32(swap, ph32.p_filesz) \
: elf_getu64(swap, ph64.p_filesz)))
#define xph_memsz CAST(size_t, ((clazz == ELFCLASS32 \
? elf_getu32(swap, ph32.p_memsz) \
: elf_getu64(swap, ph64.p_memsz))))
#define xnh_addr (clazz == ELFCLASS32 \
? CAST(void *, &nh32) \
: CAST(void *, &nh64))
#define xnh_sizeof (clazz == ELFCLASS32 \
? sizeof(nh32) \
: sizeof(nh64))
#define xnh_type (clazz == ELFCLASS32 \
? elf_getu32(swap, nh32.n_type) \
: elf_getu32(swap, nh64.n_type))
#define xnh_namesz (clazz == ELFCLASS32 \
? elf_getu32(swap, nh32.n_namesz) \
: elf_getu32(swap, nh64.n_namesz))
#define xnh_descsz (clazz == ELFCLASS32 \
? elf_getu32(swap, nh32.n_descsz) \
: elf_getu32(swap, nh64.n_descsz))
#define xdh_addr (clazz == ELFCLASS32 \
? CAST(void *, &dh32) \
: CAST(void *, &dh64))
#define xdh_sizeof (clazz == ELFCLASS32 \
? sizeof(dh32) \
: sizeof(dh64))
#define xdh_tag (clazz == ELFCLASS32 \
? elf_getu32(swap, dh32.d_tag) \
: elf_getu64(swap, dh64.d_tag))
#define xdh_val (clazz == ELFCLASS32 \
? elf_getu32(swap, dh32.d_un.d_val) \
: elf_getu64(swap, dh64.d_un.d_val))
#define xcap_addr (clazz == ELFCLASS32 \
? CAST(void *, &cap32) \
: CAST(void *, &cap64))
#define xcap_sizeof (clazz == ELFCLASS32 \
? sizeof(cap32) \
: sizeof(cap64))
#define xcap_tag (clazz == ELFCLASS32 \
? elf_getu32(swap, cap32.c_tag) \
: elf_getu64(swap, cap64.c_tag))
#define xcap_val (clazz == ELFCLASS32 \
? elf_getu32(swap, cap32.c_un.c_val) \
: elf_getu64(swap, cap64.c_un.c_val))
#define xauxv_addr (clazz == ELFCLASS32 \
? CAST(void *, &auxv32) \
: CAST(void *, &auxv64))
#define xauxv_sizeof (clazz == ELFCLASS32 \
? sizeof(auxv32) \
: sizeof(auxv64))
#define xauxv_type (clazz == ELFCLASS32 \
? elf_getu32(swap, auxv32.a_type) \
: elf_getu64(swap, auxv64.a_type))
#define xauxv_val (clazz == ELFCLASS32 \
? elf_getu32(swap, auxv32.a_v) \
: elf_getu64(swap, auxv64.a_v))
#define prpsoffsets(i) (clazz == ELFCLASS32 \
? prpsoffsets32[i] \
: prpsoffsets64[i])
#ifdef ELFCORE
/*
* Try larger offsets first to avoid false matches
* from earlier data that happen to look like strings.
*/
static const size_t prpsoffsets32[] = {
#ifdef USE_NT_PSINFO
104, /* SunOS 5.x (command line) */
88, /* SunOS 5.x (short name) */
#endif /* USE_NT_PSINFO */
100, /* SunOS 5.x (command line) */
84, /* SunOS 5.x (short name) */
44, /* Linux (command line) */
28, /* Linux (short name) */
48, /* Linux PowerPC (command line) */
32, /* Linux PowerPC (short name) */
8, /* FreeBSD */
};
static const size_t prpsoffsets64[] = {
#ifdef USE_NT_PSINFO
152, /* SunOS 5.x (command line) */
136, /* SunOS 5.x (short name) */
#endif /* USE_NT_PSINFO */
136, /* SunOS 5.x, 64-bit (command line) */
120, /* SunOS 5.x, 64-bit (short name) */
56, /* Linux (command line) */
40, /* Linux (tested on core from 2.4.x, short name) */
16, /* FreeBSD, 64-bit */
};
#define NOFFSETS32 __arraycount(prpsoffsets32)
#define NOFFSETS64 __arraycount(prpsoffsets64)
#define NOFFSETS (clazz == 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.
*
* SunOS 5.x core files contain two PT_NOTE sections, with the types
* NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the
* same info about the command name and command line, so it probably
* isn't worthwhile to look for NT_PSINFO, but the offsets are provided
* above (see USE_NT_PSINFO), in case we ever decide to do so. The
* NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent;
* the SunOS 5.x file command relies on this (and prefers the latter).
*
* 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[][8] = {
"SVR4",
"FreeBSD",
"NetBSD",
};
#define FLAGS_CORE_STYLE 0x0003
#define FLAGS_DID_CORE 0x0004
#define FLAGS_DID_OS_NOTE 0x0008
#define FLAGS_DID_BUILD_ID 0x0010
#define FLAGS_DID_CORE_STYLE 0x0020
#define FLAGS_DID_NETBSD_PAX 0x0040
#define FLAGS_DID_NETBSD_MARCH 0x0080
#define FLAGS_DID_NETBSD_CMODEL 0x0100
#define FLAGS_DID_NETBSD_EMULATION 0x0200
#define FLAGS_DID_NETBSD_UNKNOWN 0x0400
#define FLAGS_IS_CORE 0x0800
#define FLAGS_DID_AUXV 0x1000
private int
dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
int num, size_t size, off_t fsize, int *flags, uint16_t *notecount)
{
Elf32_Phdr ph32;
Elf64_Phdr ph64;
size_t offset, len;
unsigned char nbuf[BUFSIZ];
ssize_t bufsize;
off_t ph_off = off;
int ph_num = num;
if (ms->flags & MAGIC_MIME)
return 0;
if (num == 0) {
if (file_printf(ms, ", no program header") == -1)
return -1;
return 0;
}
if (size != xph_sizeof) {
if (file_printf(ms, ", corrupted program header size") == -1)
return -1;
return 0;
}
/*
* Loop through all the program headers.
*/
for ( ; num; num--) {
if (pread(fd, xph_addr, xph_sizeof, off) <
CAST(ssize_t, xph_sizeof)) {
file_badread(ms);
return -1;
}
off += size;
if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
/* Perhaps warn here */
continue;
}
if (xph_type != PT_NOTE)
continue;
/*
* This is a PT_NOTE section; loop through all the notes
* in the section.
*/
len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf);
if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) {
file_badread(ms);
return -1;
}
offset = 0;
for (;;) {
if (offset >= CAST(size_t, bufsize))
break;
offset = donote(ms, nbuf, offset, CAST(size_t, bufsize),
clazz, swap, 4, flags, notecount, fd, ph_off,
ph_num, fsize);
if (offset == 0)
break;
}
}
return 0;
}
#endif
static int
do_note_netbsd_version(struct magic_set *ms, int swap, void *v)
{
uint32_t desc;
memcpy(&desc, v, sizeof(desc));
desc = elf_getu32(swap, desc);
if (file_printf(ms, ", for NetBSD") == -1)
return -1;
/*
* 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) {
uint32_t ver_patch = (desc / 100) % 100;
uint32_t ver_rel = (desc / 10000) % 100;
uint32_t ver_min = (desc / 1000000) % 100;
uint32_t ver_maj = desc / 100000000;
if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
return -1;
if (ver_rel == 0 && ver_patch != 0) {
if (file_printf(ms, ".%u", ver_patch) == -1)
return -1;
} else if (ver_rel != 0) {
while (ver_rel > 26) {
if (file_printf(ms, "Z") == -1)
return -1;
ver_rel -= 26;
}
if (file_printf(ms, "%c", 'A' + ver_rel - 1)
== -1)
return -1;
}
}
return 0;
}
static int
do_note_freebsd_version(struct magic_set *ms, int swap, void *v)
{
uint32_t desc;
memcpy(&desc, v, sizeof(desc));
desc = elf_getu32(swap, desc);
if (file_printf(ms, ", for FreeBSD") == -1)
return -1;
/*
* 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)
* Mmi0p0 (before 5.0)
* Mmm0p0
*
* Development branches:
* Mmpxxx (before 4.6)
* Mmp1xx (before 4.10)
* Mmi1xx (before 5.0)
* M000xx (pre-M.0)
* Mmm1xx
*
* M = major version
* m = minor version
* i = minor version increment (491000 -> 4.10)
* p = patchlevel
* 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 -1;
} else if (desc < 460100) {
if (file_printf(ms, " %d.%d", desc / 100000,
desc / 10000 % 10) == -1)
return -1;
if (desc / 1000 % 10 > 0)
if (file_printf(ms, ".%d", desc / 1000 % 10) == -1)
return -1;
if ((desc % 1000 > 0) || (desc % 100000 == 0))
if (file_printf(ms, " (%d)", desc) == -1)
return -1;
} else if (desc < 500000) {
if (file_printf(ms, " %d.%d", desc / 100000,
desc / 10000 % 10 + desc / 1000 % 10) == -1)
return -1;
if (desc / 100 % 10 > 0) {
if (file_printf(ms, " (%d)", desc) == -1)
return -1;
} else if (desc / 10 % 10 > 0) {
if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
return -1;
}
} else {
if (file_printf(ms, " %d.%d", desc / 100000,
desc / 1000 % 100) == -1)
return -1;
if ((desc / 100 % 10 > 0) ||
(desc % 100000 / 100 == 0)) {
if (file_printf(ms, " (%d)", desc) == -1)
return -1;
} else if (desc / 10 % 10 > 0) {
if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
return -1;
}
}
return 0;
}
private int
/*ARGSUSED*/
do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz,
size_t noff, size_t doff, int *flags)
{
if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "GNU") == 0 &&
type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) {
uint8_t desc[20];
const char *btype;
uint32_t i;
*flags |= FLAGS_DID_BUILD_ID;
switch (descsz) {
case 8:
btype = "xxHash";
break;
case 16:
btype = "md5/uuid";
break;
case 20:
btype = "sha1";
break;
default:
btype = "unknown";
break;
}
if (file_printf(ms, ", BuildID[%s]=", btype) == -1)
return -1;
memcpy(desc, &nbuf[doff], descsz);
for (i = 0; i < descsz; i++)
if (file_printf(ms, "%02x", desc[i]) == -1)
return -1;
return 1;
}
if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "Go") == 0 &&
type == NT_GO_BUILD_ID && descsz < 128) {
char buf[256];
if (file_printf(ms, ", Go BuildID=%s",
file_copystr(buf, sizeof(buf), descsz,
RCAST(const char *, &nbuf[doff]))) == -1)
return -1;
return 1;
}
return 0;
}
private int
do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
int swap, uint32_t namesz, uint32_t descsz,
size_t noff, size_t doff, int *flags)
{
const char *name = RCAST(const char *, &nbuf[noff]);
if (namesz == 5 && strcmp(name, "SuSE") == 0 &&
type == NT_GNU_VERSION && descsz == 2) {
*flags |= FLAGS_DID_OS_NOTE;
if (file_printf(ms, ", for SuSE %d.%d", nbuf[doff],
nbuf[doff + 1]) == -1)
return -1;
return 1;
}
if (namesz == 4 && strcmp(name, "GNU") == 0 &&
type == NT_GNU_VERSION && descsz == 16) {
uint32_t desc[4];
memcpy(desc, &nbuf[doff], sizeof(desc));
*flags |= FLAGS_DID_OS_NOTE;
if (file_printf(ms, ", for GNU/") == -1)
return -1;
switch (elf_getu32(swap, desc[0])) {
case GNU_OS_LINUX:
if (file_printf(ms, "Linux") == -1)
return -1;
break;
case GNU_OS_HURD:
if (file_printf(ms, "Hurd") == -1)
return -1;
break;
case GNU_OS_SOLARIS:
if (file_printf(ms, "Solaris") == -1)
return -1;
break;
case GNU_OS_KFREEBSD:
if (file_printf(ms, "kFreeBSD") == -1)
return -1;
break;
case GNU_OS_KNETBSD:
if (file_printf(ms, "kNetBSD") == -1)
return -1;
break;
default:
if (file_printf(ms, "<unknown>") == -1)
return -1;
}
if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]),
elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1)
return -1;
return 1;
}
if (namesz == 7 && strcmp(name, "NetBSD") == 0) {
if (type == NT_NETBSD_VERSION && descsz == 4) {
*flags |= FLAGS_DID_OS_NOTE;
if (do_note_netbsd_version(ms, swap, &nbuf[doff]) == -1)
return -1;
return 1;
}
}
if (namesz == 8 && strcmp(name, "FreeBSD") == 0) {
if (type == NT_FREEBSD_VERSION && descsz == 4) {
*flags |= FLAGS_DID_OS_NOTE;
if (do_note_freebsd_version(ms, swap, &nbuf[doff])
== -1)
return -1;
return 1;
}
}
if (namesz == 8 && strcmp(name, "OpenBSD") == 0 &&
type == NT_OPENBSD_VERSION && descsz == 4) {
*flags |= FLAGS_DID_OS_NOTE;
if (file_printf(ms, ", for OpenBSD") == -1)
return -1;
/* Content of note is always 0 */
return 1;
}
if (namesz == 10 && strcmp(name, "DragonFly") == 0 &&
type == NT_DRAGONFLY_VERSION && descsz == 4) {
uint32_t desc;
*flags |= FLAGS_DID_OS_NOTE;
if (file_printf(ms, ", for DragonFly") == -1)
return -1;
memcpy(&desc, &nbuf[doff], sizeof(desc));
desc = elf_getu32(swap, desc);
if (file_printf(ms, " %d.%d.%d", desc / 100000,
desc / 10000 % 10, desc % 10000) == -1)
return -1;
return 1;
}
return 0;
}
private int
do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
int swap, uint32_t namesz, uint32_t descsz,
size_t noff, size_t doff, int *flags)
{
const char *name = RCAST(const char *, &nbuf[noff]);
if (namesz == 4 && strcmp(name, "PaX") == 0 &&
type == NT_NETBSD_PAX && descsz == 4) {
static const char *pax[] = {
"+mprotect",
"-mprotect",
"+segvguard",
"-segvguard",
"+ASLR",
"-ASLR",
};
uint32_t desc;
size_t i;
int did = 0;
*flags |= FLAGS_DID_NETBSD_PAX;
memcpy(&desc, &nbuf[doff], sizeof(desc));
desc = elf_getu32(swap, desc);
if (desc && file_printf(ms, ", PaX: ") == -1)
return -1;
for (i = 0; i < __arraycount(pax); i++) {
if (((1 << CAST(int, i)) & desc) == 0)
continue;
if (file_printf(ms, "%s%s", did++ ? "," : "",
pax[i]) == -1)
return -1;
}
return 1;
}
return 0;
}
private int
do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
int swap, uint32_t namesz, uint32_t descsz,
size_t noff, size_t doff, int *flags, size_t size, int clazz)
{
#ifdef ELFCORE
char buf[256];
const char *name = RCAST(const char *, &nbuf[noff]);
int os_style = -1;
/*
* 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(name, "CORE", 4) == 0) ||
(namesz == 5 && strcmp(name, "CORE") == 0)) {
os_style = OS_STYLE_SVR4;
}
if ((namesz == 8 && strcmp(name, "FreeBSD") == 0)) {
os_style = OS_STYLE_FREEBSD;
}
if ((namesz >= 11 && strncmp(name, "NetBSD-CORE", 11)
== 0)) {
os_style = OS_STYLE_NETBSD;
}
if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) {
if (file_printf(ms, ", %s-style", os_style_names[os_style])
== -1)
return -1;
*flags |= FLAGS_DID_CORE_STYLE;
*flags |= os_style;
}
switch (os_style) {
case OS_STYLE_NETBSD:
if (type == NT_NETBSD_CORE_PROCINFO) {
char sbuf[512];
struct NetBSD_elfcore_procinfo pi;
memset(&pi, 0, sizeof(pi));
memcpy(&pi, nbuf + doff, MIN(descsz, sizeof(pi)));
if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, "
"gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)",
file_printable(sbuf, sizeof(sbuf),
RCAST(char *, pi.cpi_name), sizeof(pi.cpi_name)),
elf_getu32(swap, CAST(uint32_t, pi.cpi_pid)),
elf_getu32(swap, pi.cpi_euid),
elf_getu32(swap, pi.cpi_egid),
elf_getu32(swap, pi.cpi_nlwps),
elf_getu32(swap, CAST(uint32_t, pi.cpi_siglwp)),
elf_getu32(swap, pi.cpi_signo),
elf_getu32(swap, pi.cpi_sigcode)) == -1)
return -1;
*flags |= FLAGS_DID_CORE;
return 1;
}
break;
case OS_STYLE_FREEBSD:
if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
size_t argoff, pidoff;
if (clazz == ELFCLASS32)
argoff = 4 + 4 + 17;
else
argoff = 4 + 4 + 8 + 17;
if (file_printf(ms, ", from '%.80s'", nbuf + doff +
argoff) == -1)
return -1;
pidoff = argoff + 81 + 2;
if (doff + pidoff + 4 <= size) {
if (file_printf(ms, ", pid=%u",
elf_getu32(swap, *RCAST(uint32_t *, (nbuf +
doff + pidoff)))) == -1)
return -1;
}
*flags |= FLAGS_DID_CORE;
}
break;
default:
if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
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;
size_t k;
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.
*/
/*
* Try next offsets, in case this match is
* in the middle of a string.
*/
for (k = i + 1 ; k < NOFFSETS; k++) {
size_t no;
int adjust = 1;
if (prpsoffsets(k) >= prpsoffsets(i))
continue;
for (no = doff + prpsoffsets(k);
no < doff + prpsoffsets(i); no++)
adjust = adjust
&& isprint(nbuf[no]);
if (adjust)
i = k;
}
cname = CAST(unsigned char *,
&nbuf[doff + prpsoffsets(i)]);
for (cp = cname; cp < nbuf + size && *cp
&& isprint(*cp); cp++)
continue;
/*
* Linux apparently appends a space at the end
* of the command line: remove it.
*/
while (cp > cname && isspace(cp[-1]))
cp--;
if (file_printf(ms, ", from '%s'",
file_copystr(buf, sizeof(buf),
CAST(size_t, cp - cname),
CAST(const char *, cname))) == -1)
return -1;
*flags |= FLAGS_DID_CORE;
return 1;
tryanother:
;
}
}
break;
}
#endif
return 0;
}
private off_t
get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd,
off_t off, int num, off_t fsize, uint64_t virtaddr)
{
Elf32_Phdr ph32;
Elf64_Phdr ph64;
/*
* Loop through all the program headers and find the header with
* virtual address in which the "virtaddr" belongs to.
*/
for ( ; num; num--) {
if (pread(fd, xph_addr, xph_sizeof, off) <
CAST(ssize_t, xph_sizeof)) {
file_badread(ms);
return -1;
}
off += xph_sizeof;
if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
/* Perhaps warn here */
continue;
}
if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz)
return xph_offset + (virtaddr - xph_vaddr);
}
return 0;
}
private size_t
get_string_on_virtaddr(struct magic_set *ms,
int swap, int clazz, int fd, off_t ph_off, int ph_num,
off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen)
{
char *bptr;
off_t offset;
if (buflen == 0)
return 0;
offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num,
fsize, virtaddr);
if (offset < 0 ||
(buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) {
file_badread(ms);
return 0;
}
buf[buflen - 1] = '\0';
/* We expect only printable characters, so return if buffer contains
* non-printable character before the '\0' or just '\0'. */
for (bptr = buf; *bptr && isprint(CAST(unsigned char, *bptr)); bptr++)
continue;
if (*bptr != '\0')
return 0;
return bptr - buf;
}
/*ARGSUSED*/
private int
do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
int swap, uint32_t namesz __attribute__((__unused__)),
uint32_t descsz __attribute__((__unused__)),
size_t noff __attribute__((__unused__)), size_t doff,
int *flags, size_t size __attribute__((__unused__)), int clazz,
int fd, off_t ph_off, int ph_num, off_t fsize)
{
#ifdef ELFCORE
Aux32Info auxv32;
Aux64Info auxv64;
size_t elsize = xauxv_sizeof;
const char *tag;
int is_string;
size_t nval;
if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) !=
(FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE))
return 0;
switch (*flags & FLAGS_CORE_STYLE) {
case OS_STYLE_SVR4:
if (type != NT_AUXV)
return 0;
break;
#ifdef notyet
case OS_STYLE_NETBSD:
if (type != NT_NETBSD_CORE_AUXV)
return 0;
break;
case OS_STYLE_FREEBSD:
if (type != NT_FREEBSD_PROCSTAT_AUXV)
return 0;
break;
#endif
default:
return 0;
}
*flags |= FLAGS_DID_AUXV;
nval = 0;
for (size_t off = 0; off + elsize <= descsz; off += elsize) {
memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof);
/* Limit processing to 50 vector entries to prevent DoS */
if (nval++ >= 50) {
file_error(ms, 0, "Too many ELF Auxv elements");
return 1;
}
switch(xauxv_type) {
case AT_LINUX_EXECFN:
is_string = 1;
tag = "execfn";
break;
case AT_LINUX_PLATFORM:
is_string = 1;
tag = "platform";
break;
case AT_LINUX_UID:
is_string = 0;
tag = "real uid";
break;
case AT_LINUX_GID:
is_string = 0;
tag = "real gid";
break;
case AT_LINUX_EUID:
is_string = 0;
tag = "effective uid";
break;
case AT_LINUX_EGID:
is_string = 0;
tag = "effective gid";
break;
default:
is_string = 0;
tag = NULL;
break;
}
if (tag == NULL)
continue;
if (is_string) {
char buf[256];
ssize_t buflen;
buflen = get_string_on_virtaddr(ms, swap, clazz, fd,
ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf));
if (buflen == 0)
continue;
if (file_printf(ms, ", %s: '%s'", tag, buf) == -1)
return -1;
} else {
if (file_printf(ms, ", %s: %d", tag,
CAST(int, xauxv_val)) == -1)
return -1;
}
}
return 1;
#else
return 0;
#endif
}
private size_t
dodynamic(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
int clazz, int swap)
{
Elf32_Dyn dh32;
Elf64_Dyn dh64;
unsigned char *dbuf = CAST(unsigned char *, vbuf);
if (xdh_sizeof + offset > size) {
/*
* We're out of note headers.
*/
return xdh_sizeof + offset;
}
memcpy(xdh_addr, &dbuf[offset], xdh_sizeof);
offset += xdh_sizeof;
switch (xdh_tag) {
case DT_FLAGS_1:
if (xdh_val & DF_1_PIE)
ms->mode |= 0111;
else
ms->mode &= ~0111;
break;
default:
break;
}
return offset;
}
private size_t
donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
int clazz, int swap, size_t align, int *flags, uint16_t *notecount,
int fd, off_t ph_off, int ph_num, off_t fsize)
{
Elf32_Nhdr nh32;
Elf64_Nhdr nh64;
size_t noff, doff;
uint32_t namesz, descsz;
char buf[256];
unsigned char *nbuf = CAST(unsigned char *, vbuf);
if (*notecount == 0)
return 0;
--*notecount;
if (xnh_sizeof + offset > size) {
/*
* We're out of note headers.
*/
return xnh_sizeof + offset;
}
/*XXX: GCC */
memset(&nh32, 0, sizeof(nh32));
memset(&nh64, 0, sizeof(nh64));
memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
offset += xnh_sizeof;
namesz = xnh_namesz;
descsz = xnh_descsz;
if ((namesz == 0) && (descsz == 0)) {
/*
* We're out of note headers.
*/
return (offset >= size) ? offset : size;
}
if (namesz & 0x80000000) {
if (file_printf(ms, ", bad note name size %#lx",
CAST(unsigned long, namesz)) == -1)
return -1;
return 0;
}
if (descsz & 0x80000000) {
if (file_printf(ms, ", bad note description size %#lx",
CAST(unsigned long, descsz)) == -1)
return -1;
return 0;
}
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 (doff + descsz > size) {
/*
* We're past the end of the buffer.
*/
return (offset >= size) ? offset : size;
}
if ((*flags & FLAGS_DID_OS_NOTE) == 0) {
if (do_os_note(ms, nbuf, xnh_type, swap,
namesz, descsz, noff, doff, flags))
return offset;
}
if ((*flags & FLAGS_DID_BUILD_ID) == 0) {
if (do_bid_note(ms, nbuf, xnh_type, swap,
namesz, descsz, noff, doff, flags))
return offset;
}
if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) {
if (do_pax_note(ms, nbuf, xnh_type, swap,
namesz, descsz, noff, doff, flags))
return offset;
}
if ((*flags & FLAGS_DID_CORE) == 0) {
if (do_core_note(ms, nbuf, xnh_type, swap,
namesz, descsz, noff, doff, flags, size, clazz))
return offset;
}
if ((*flags & FLAGS_DID_AUXV) == 0) {
if (do_auxv_note(ms, nbuf, xnh_type, swap,
namesz, descsz, noff, doff, flags, size, clazz,
fd, ph_off, ph_num, fsize))
return offset;
}
if (namesz == 7 && strcmp(RCAST(char *, &nbuf[noff]), "NetBSD") == 0) {
int descw, flag;
const char *str, *tag;
if (descsz > 100)
descsz = 100;
switch (xnh_type) {
case NT_NETBSD_VERSION:
return offset;
case NT_NETBSD_MARCH:
flag = FLAGS_DID_NETBSD_MARCH;
tag = "compiled for";
break;
case NT_NETBSD_CMODEL:
flag = FLAGS_DID_NETBSD_CMODEL;
tag = "compiler model";
break;
case NT_NETBSD_EMULATION:
flag = FLAGS_DID_NETBSD_EMULATION;
tag = "emulation:";
break;
default:
if (*flags & FLAGS_DID_NETBSD_UNKNOWN)
return offset;
*flags |= FLAGS_DID_NETBSD_UNKNOWN;
if (file_printf(ms, ", note=%u", xnh_type) == -1)
return offset;
return offset;
}
if (*flags & flag)
return offset;
str = RCAST(const char *, &nbuf[doff]);
descw = CAST(int, descsz);
*flags |= flag;
file_printf(ms, ", %s: %s", tag,
file_copystr(buf, sizeof(buf), descw, str));
return offset;
}
return offset;
}
/* SunOS 5.x hardware capability descriptions */
typedef struct cap_desc {
uint64_t cd_mask;
const char *cd_name;
} cap_desc_t;
static const cap_desc_t cap_desc_sparc[] = {
{ AV_SPARC_MUL32, "MUL32" },
{ AV_SPARC_DIV32, "DIV32" },
{ AV_SPARC_FSMULD, "FSMULD" },
{ AV_SPARC_V8PLUS, "V8PLUS" },
{ AV_SPARC_POPC, "POPC" },
{ AV_SPARC_VIS, "VIS" },
{ AV_SPARC_VIS2, "VIS2" },
{ AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" },
{ AV_SPARC_FMAF, "FMAF" },
{ AV_SPARC_FJFMAU, "FJFMAU" },
{ AV_SPARC_IMA, "IMA" },
{ 0, NULL }
};
static const cap_desc_t cap_desc_386[] = {
{ AV_386_FPU, "FPU" },
{ AV_386_TSC, "TSC" },
{ AV_386_CX8, "CX8" },
{ AV_386_SEP, "SEP" },
{ AV_386_AMD_SYSC, "AMD_SYSC" },
{ AV_386_CMOV, "CMOV" },
{ AV_386_MMX, "MMX" },
{ AV_386_AMD_MMX, "AMD_MMX" },
{ AV_386_AMD_3DNow, "AMD_3DNow" },
{ AV_386_AMD_3DNowx, "AMD_3DNowx" },
{ AV_386_FXSR, "FXSR" },
{ AV_386_SSE, "SSE" },
{ AV_386_SSE2, "SSE2" },
{ AV_386_PAUSE, "PAUSE" },
{ AV_386_SSE3, "SSE3" },
{ AV_386_MON, "MON" },
{ AV_386_CX16, "CX16" },
{ AV_386_AHF, "AHF" },
{ AV_386_TSCP, "TSCP" },
{ AV_386_AMD_SSE4A, "AMD_SSE4A" },
{ AV_386_POPCNT, "POPCNT" },
{ AV_386_AMD_LZCNT, "AMD_LZCNT" },
{ AV_386_SSSE3, "SSSE3" },
{ AV_386_SSE4_1, "SSE4.1" },
{ AV_386_SSE4_2, "SSE4.2" },
{ 0, NULL }
};
private int
doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num,
size_t size, off_t fsize, int mach, int strtab, int *flags,
uint16_t *notecount)
{
Elf32_Shdr sh32;
Elf64_Shdr sh64;
int stripped = 1, has_debug_info = 0;
size_t nbadcap = 0;
void *nbuf;
off_t noff, coff, name_off;
uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */
uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */
char name[50];
ssize_t namesize;
if (ms->flags & MAGIC_MIME)
return 0;
if (num == 0) {
if (file_printf(ms, ", no section header") == -1)
return -1;
return 0;
}
if (size != xsh_sizeof) {
if (file_printf(ms, ", corrupted section header size") == -1)
return -1;
return 0;
}
/* Read offset of name section to be able to read section names later */
if (pread(fd, xsh_addr, xsh_sizeof, CAST(off_t, (off + size * strtab)))
< CAST(ssize_t, xsh_sizeof)) {
if (file_printf(ms, ", missing section headers") == -1)
return -1;
return 0;
}
name_off = xsh_offset;
if (fsize != SIZE_UNKNOWN && fsize < name_off) {
if (file_printf(ms, ", too large section header offset %jd",
(intmax_t)name_off) == -1)
return -1;
return 0;
}
for ( ; num; num--) {
/* Read the name of this section. */
if ((namesize = pread(fd, name, sizeof(name) - 1,
name_off + xsh_name)) == -1) {
file_badread(ms);
return -1;
}
name[namesize] = '\0';
if (strcmp(name, ".debug_info") == 0) {
has_debug_info = 1;
stripped = 0;
}
if (pread(fd, xsh_addr, xsh_sizeof, off) <
CAST(ssize_t, xsh_sizeof)) {
file_badread(ms);
return -1;
}
off += size;
/* Things we can determine before we seek */
switch (xsh_type) {
case SHT_SYMTAB:
#if 0
case SHT_DYNSYM:
#endif
stripped = 0;
break;
default:
if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) {
/* Perhaps warn here */
continue;
}
break;
}
/* Things we can determine when we seek */
switch (xsh_type) {
case SHT_NOTE:
if (CAST(uintmax_t, (xsh_size + xsh_offset)) >
CAST(uintmax_t, fsize)) {
if (file_printf(ms,
", note offset/size %#" INTMAX_T_FORMAT
"x+%#" INTMAX_T_FORMAT "x exceeds"
" file size %#" INTMAX_T_FORMAT "x",
CAST(uintmax_t, xsh_offset),
CAST(uintmax_t, xsh_size),
CAST(uintmax_t, fsize)) == -1)
return -1;
return 0;
}
if ((nbuf = malloc(xsh_size)) == NULL) {
file_error(ms, errno, "Cannot allocate memory"
" for note");
return -1;
}
if (pread(fd, nbuf, xsh_size, xsh_offset) <
CAST(ssize_t, xsh_size)) {
file_badread(ms);
free(nbuf);
return -1;
}
noff = 0;
for (;;) {
if (noff >= CAST(off_t, xsh_size))
break;
noff = donote(ms, nbuf, CAST(size_t, noff),
xsh_size, clazz, swap, 4, flags, notecount,
fd, 0, 0, 0);
if (noff == 0)
break;
}
free(nbuf);
break;
case SHT_SUNW_cap:
switch (mach) {
case EM_SPARC:
case EM_SPARCV9:
case EM_IA_64:
case EM_386:
case EM_AMD64:
break;
default:
goto skip;
}
if (nbadcap > 5)
break;
if (lseek(fd, xsh_offset, SEEK_SET)
== CAST(off_t, -1)) {
file_badseek(ms);
return -1;
}
coff = 0;
for (;;) {
Elf32_Cap cap32;
Elf64_Cap cap64;
char cbuf[/*CONSTCOND*/
MAX(sizeof(cap32), sizeof(cap64))];
if ((coff += xcap_sizeof) >
CAST(off_t, xsh_size))
break;
if (read(fd, cbuf, CAST(size_t, xcap_sizeof)) !=
CAST(ssize_t, xcap_sizeof)) {
file_badread(ms);
return -1;
}
if (cbuf[0] == 'A') {
#ifdef notyet
char *p = cbuf + 1;
uint32_t len, tag;
memcpy(&len, p, sizeof(len));
p += 4;
len = getu32(swap, len);
if (memcmp("gnu", p, 3) != 0) {
if (file_printf(ms,
", unknown capability %.3s", p)
== -1)
return -1;
break;
}
p += strlen(p) + 1;
tag = *p++;
memcpy(&len, p, sizeof(len));
p += 4;
len = getu32(swap, len);
if (tag != 1) {
if (file_printf(ms, ", unknown gnu"
" capability tag %d", tag)
== -1)
return -1;
break;
}
// gnu attributes
#endif
break;
}
memcpy(xcap_addr, cbuf, xcap_sizeof);
switch (xcap_tag) {
case CA_SUNW_NULL:
break;
case CA_SUNW_HW_1:
cap_hw1 |= xcap_val;
break;
case CA_SUNW_SF_1:
cap_sf1 |= xcap_val;
break;
default:
if (file_printf(ms,
", with unknown capability "
"%#" INT64_T_FORMAT "x = %#"
INT64_T_FORMAT "x",
CAST(unsigned long long, xcap_tag),
CAST(unsigned long long, xcap_val))
== -1)
return -1;
if (nbadcap++ > 2)
coff = xsh_size;
break;
}
}
/*FALLTHROUGH*/
skip:
default:
break;
}
}
if (has_debug_info) {
if (file_printf(ms, ", with debug_info") == -1)
return -1;
}
if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1)
return -1;
if (cap_hw1) {
const cap_desc_t *cdp;
switch (mach) {
case EM_SPARC:
case EM_SPARC32PLUS:
case EM_SPARCV9:
cdp = cap_desc_sparc;
break;
case EM_386:
case EM_IA_64:
case EM_AMD64:
cdp = cap_desc_386;
break;
default:
cdp = NULL;
break;
}
if (file_printf(ms, ", uses") == -1)
return -1;
if (cdp) {
while (cdp->cd_name) {
if (cap_hw1 & cdp->cd_mask) {
if (file_printf(ms,
" %s", cdp->cd_name) == -1)
return -1;
cap_hw1 &= ~cdp->cd_mask;
}
++cdp;
}
if (cap_hw1)
if (file_printf(ms,
" unknown hardware capability %#"
INT64_T_FORMAT "x",
CAST(unsigned long long, cap_hw1)) == -1)
return -1;
} else {
if (file_printf(ms,
" hardware capability %#" INT64_T_FORMAT "x",
CAST(unsigned long long, cap_hw1)) == -1)
return -1;
}
}
if (cap_sf1) {
if (cap_sf1 & SF1_SUNW_FPUSED) {
if (file_printf(ms,
(cap_sf1 & SF1_SUNW_FPKNWN)
? ", uses frame pointer"
: ", not known to use frame pointer") == -1)
return -1;
}
cap_sf1 &= ~SF1_SUNW_MASK;
if (cap_sf1)
if (file_printf(ms,
", with unknown software capability %#"
INT64_T_FORMAT "x",
CAST(unsigned long long, cap_sf1)) == -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 clazz, int swap, int fd, off_t off,
int num, size_t size, off_t fsize, int sh_num, int *flags,
uint16_t *notecount)
{
Elf32_Phdr ph32;
Elf64_Phdr ph64;
const char *linking_style = "statically";
unsigned char nbuf[BUFSIZ];
char ibuf[BUFSIZ];
char interp[BUFSIZ];
ssize_t bufsize;
size_t offset, align, len;
if (num == 0) {
if (file_printf(ms, ", no program header") == -1)
return -1;
return 0;
}
if (size != xph_sizeof) {
if (file_printf(ms, ", corrupted program header size") == -1)
return -1;
return 0;
}
interp[0] = '\0';
for ( ; num; num--) {
int doread;
if (pread(fd, xph_addr, xph_sizeof, off) <
CAST(ssize_t, xph_sizeof)) {
file_badread(ms);
return -1;
}
off += size;
bufsize = 0;
align = 4;
/* Things we can determine before we seek */
switch (xph_type) {
case PT_DYNAMIC:
doread = 1;
linking_style = "dynamically";
break;
case PT_NOTE:
if (sh_num) /* Did this through section headers */
continue;
if (((align = xph_align) & 0x80000000UL) != 0 ||
align < 4) {
if (file_printf(ms,
", invalid note alignment %#lx",
CAST(unsigned long, align)) == -1)
return -1;
align = 4;
}
/*FALLTHROUGH*/
case PT_INTERP:
doread = 1;
break;
default:
doread = 0;
if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
/* Maybe warn here? */
continue;
}
break;
}
if (doread) {
len = xph_filesz < sizeof(nbuf) ? xph_filesz
: sizeof(nbuf);
bufsize = pread(fd, nbuf, len, xph_offset);
if (bufsize == -1) {
file_badread(ms);
return -1;
}
} else
len = 0;
/* Things we can determine when we seek */
switch (xph_type) {
case PT_DYNAMIC:
offset = 0;
// Let DF_1 determine if we are PIE or not.
ms->mode &= ~0111;
for (;;) {
if (offset >= CAST(size_t, bufsize))
break;
offset = dodynamic(ms, nbuf, offset,
CAST(size_t, bufsize), clazz, swap);
if (offset == 0)
break;
}
if (ms->flags & MAGIC_MIME)
continue;
break;
case PT_INTERP:
if (ms->flags & MAGIC_MIME)
continue;
if (bufsize && nbuf[0]) {
nbuf[bufsize - 1] = '\0';
memcpy(interp, nbuf, CAST(size_t, bufsize));
} else
strlcpy(interp, "*empty*", sizeof(interp));
break;
case PT_NOTE:
if (ms->flags & MAGIC_MIME)
return 0;
/*
* This is a PT_NOTE section; loop through all the notes
* in the section.
*/
offset = 0;
for (;;) {
if (offset >= CAST(size_t, bufsize))
break;
offset = donote(ms, nbuf, offset,
CAST(size_t, bufsize), clazz, swap, align,
flags, notecount, fd, 0, 0, 0);
if (offset == 0)
break;
}
break;
default:
if (ms->flags & MAGIC_MIME)
continue;
break;
}
}
if (ms->flags & MAGIC_MIME)
return 0;
if (file_printf(ms, ", %s linked", linking_style)
== -1)
return -1;
if (interp[0])
if (file_printf(ms, ", interpreter %s",
file_printable(ibuf, sizeof(ibuf), interp, sizeof(interp)))
== -1)
return -1;
return 0;
}
protected int
file_tryelf(struct magic_set *ms, const struct buffer *b)
{
int fd = b->fd;
const unsigned char *buf = CAST(const unsigned char *, b->fbuf);
size_t nbytes = b->flen;
union {
int32_t l;
char c[sizeof(int32_t)];
} u;
int clazz;
int swap;
struct stat st;
const struct stat *stp;
off_t fsize;
int flags = 0;
Elf32_Ehdr elf32hdr;
Elf64_Ehdr elf64hdr;
uint16_t type, phnum, shnum, notecount;
if (ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION))
return 0;
/*
* 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.
* Return immediately if it's not ELF (so we avoid pipe2file unless
* needed).
*/
if (buf[EI_MAG0] != ELFMAG0
|| (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
|| buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
return 0;
/*
* If we cannot seek, it must be a pipe, socket or fifo.
*/
if((lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1))
&& (errno == ESPIPE))
fd = file_pipe2file(ms, fd, buf, nbytes);
if (fd == -1) {
file_badread(ms);
return -1;
}
stp = &b->st;
/*
* b->st.st_size != 0 if previous fstat() succeeded,
* which is likely, we can avoid extra stat() call.
*/
if (b->st.st_size == 0) {
stp = &st;
if (fstat(fd, &st) == -1) {
file_badread(ms);
return -1;
}
}
if (S_ISREG(stp->st_mode) || stp->st_size != 0)
fsize = stp->st_size;
else
fsize = SIZE_UNKNOWN;
clazz = buf[EI_CLASS];
switch (clazz) {
case ELFCLASS32:
#undef elf_getu
#define elf_getu(a, b) elf_getu32(a, b)
#undef elfhdr
#define elfhdr elf32hdr
#include "elfclass.h"
case ELFCLASS64:
#undef elf_getu
#define elf_getu(a, b) elf_getu64(a, b)
#undef elfhdr
#define elfhdr elf64hdr
#include "elfclass.h"
default:
if (file_printf(ms, ", unknown class %d", clazz) == -1)
return -1;
break;
}
return 0;
}
#endif