cxgbe/t4_tom: Read the chip's DDP page sizes and save them in a

[freebsd-src.git] / contrib / file / src / readelf.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.
 *  
 * 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 1.127 2015/11/18 12:29:29 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    ((off_t)-1)

private int
toomany(struct magic_set *ms, const char *name, uint16_t num)
{
        if (file_printf(ms, ", too many %s (%u)", name, num
            ) == -1)
                return -1;
        return 0;
}

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                    \
                         ? (void *)&sh32                        \
                         : (void *)&sh64)
#define xsh_sizeof      (clazz == ELFCLASS32                    \
                         ? sizeof(sh32)                         \
                         : sizeof(sh64))
#define xsh_size        (size_t)(clazz == ELFCLASS32            \
                         ? elf_getu32(swap, sh32.sh_size)       \
                         : elf_getu64(swap, sh64.sh_size))
#define xsh_offset      (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                    \
                         ? (void *) &ph32                       \
                         : (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      (off_t)(clazz == ELFCLASS32             \
                         ? elf_getu32(swap, ph32.p_offset)      \
                         : elf_getu64(swap, ph64.p_offset))
#define xph_align       (size_t)((clazz == ELFCLASS32           \
                         ? (off_t) (ph32.p_align ?              \
                            elf_getu32(swap, ph32.p_align) : 4) \
                         : (off_t) (ph64.p_align ?              \
                            elf_getu64(swap, ph64.p_align) : 4)))
#define xph_vaddr       (size_t)((clazz == ELFCLASS32           \
                         ? (off_t) (ph32.p_vaddr ?              \
                            elf_getu32(swap, ph32.p_vaddr) : 4) \
                         : (off_t) (ph64.p_vaddr ?              \
                            elf_getu64(swap, ph64.p_vaddr) : 4)))
#define xph_filesz      (size_t)((clazz == ELFCLASS32           \
                         ? elf_getu32(swap, ph32.p_filesz)      \
                         : elf_getu64(swap, ph64.p_filesz)))
#define xnh_addr        (clazz == ELFCLASS32                    \
                         ? (void *)&nh32                        \
                         : (void *)&nh64)
#define xph_memsz       (size_t)((clazz == ELFCLASS32           \
                         ? elf_getu32(swap, ph32.p_memsz)       \
                         : elf_getu64(swap, ph64.p_memsz)))
#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 prpsoffsets(i)  (clazz == ELFCLASS32                    \
                         ? prpsoffsets32[i]                     \
                         : prpsoffsets64[i])
#define xcap_addr       (clazz == ELFCLASS32                    \
                         ? (void *)&cap32                       \
                         : (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                    \
                         ? (void *)&auxv32                      \
                         : (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))

#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 2.0.36 (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      (sizeof prpsoffsets32 / sizeof prpsoffsets32[0])
#define NOFFSETS64      (sizeof prpsoffsets64 / sizeof prpsoffsets64[0])

#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_DID_CORE                  0x001
#define FLAGS_DID_OS_NOTE               0x002
#define FLAGS_DID_BUILD_ID              0x004
#define FLAGS_DID_CORE_STYLE            0x008
#define FLAGS_DID_NETBSD_PAX            0x010
#define FLAGS_DID_NETBSD_MARCH          0x020
#define FLAGS_DID_NETBSD_CMODEL         0x040
#define FLAGS_DID_NETBSD_UNKNOWN        0x080
#define FLAGS_IS_CORE                   0x100
#define FLAGS_DID_AUXV                  0x200

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 (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) < (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 >= (size_t)bufsize)
                                break;
                        offset = donote(ms, nbuf, offset, (size_t)bufsize,
                            clazz, swap, 4, flags, notecount, fd, ph_off,
                            ph_num, fsize);
                        if (offset == 0)
                                break;

                }
        }
        return 0;
}
#endif

static void
do_note_netbsd_version(struct magic_set *ms, int swap, void *v)
{
        uint32_t desc;
        (void)memcpy(&desc, v, sizeof(desc));
        desc = elf_getu32(swap, desc);

        if (file_printf(ms, ", for NetBSD") == -1)
                return;
        /*
         * 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;
                if (ver_rel == 0 && ver_patch != 0) {
                        if (file_printf(ms, ".%u", ver_patch) == -1)
                                return;
                } else if (ver_rel != 0) {
                        while (ver_rel > 26) {
                                if (file_printf(ms, "Z") == -1)
                                        return;
                                ver_rel -= 26;
                        }
                        if (file_printf(ms, "%c", 'A' + ver_rel - 1)
                            == -1)
                                return;
                }
        }
}

static void
do_note_freebsd_version(struct magic_set *ms, int swap, void *v)
{
        uint32_t desc;

        (void)memcpy(&desc, v, sizeof(desc));
        desc = elf_getu32(swap, desc);
        if (file_printf(ms, ", for FreeBSD") == -1)
                return;

        /*
         * 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;
        } else if (desc < 460100) {
                if (file_printf(ms, " %d.%d", desc / 100000,
                    desc / 10000 % 10) == -1)
                        return;
                if (desc / 1000 % 10 > 0)
                        if (file_printf(ms, ".%d", desc / 1000 % 10) == -1)
                                return;
                if ((desc % 1000 > 0) || (desc % 100000 == 0))
                        if (file_printf(ms, " (%d)", desc) == -1)
                                return;
        } else if (desc < 500000) {
                if (file_printf(ms, " %d.%d", desc / 100000,
                    desc / 10000 % 10 + desc / 1000 % 10) == -1)
                        return;
                if (desc / 100 % 10 > 0) {
                        if (file_printf(ms, " (%d)", desc) == -1)
                                return;
                } else if (desc / 10 % 10 > 0) {
                        if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
                                return;
                }
        } else {
                if (file_printf(ms, " %d.%d", desc / 100000,
                    desc / 1000 % 100) == -1)
                        return;
                if ((desc / 100 % 10 > 0) ||
                    (desc % 100000 / 100 == 0)) {
                        if (file_printf(ms, " (%d)", desc) == -1)
                                return;
                } else if (desc / 10 % 10 > 0) {
                        if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
                                return;
                }
        }
}

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((char *)&nbuf[noff], "GNU") == 0 &&
            type == NT_GNU_BUILD_ID && (descsz == 16 || descsz == 20)) {
                uint8_t desc[20];
                uint32_t i;
                *flags |= FLAGS_DID_BUILD_ID;
                if (file_printf(ms, ", BuildID[%s]=", descsz == 16 ? "md5/uuid" :
                    "sha1") == -1)
                        return 1;
                (void)memcpy(desc, &nbuf[doff], descsz);
                for (i = 0; i < descsz; i++)
                    if (file_printf(ms, "%02x", desc[i]) == -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)
{
        if (namesz == 5 && strcmp((char *)&nbuf[noff], "SuSE") == 0 &&
            type == NT_GNU_VERSION && descsz == 2) {
            *flags |= FLAGS_DID_OS_NOTE;
            file_printf(ms, ", for SuSE %d.%d", nbuf[doff], nbuf[doff + 1]);
            return 1;
        }

        if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
            type == NT_GNU_VERSION && descsz == 16) {
                uint32_t desc[4];
                (void)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((char *)&nbuf[noff], "NetBSD") == 0) {
                if (type == NT_NETBSD_VERSION && descsz == 4) {
                        *flags |= FLAGS_DID_OS_NOTE;
                        do_note_netbsd_version(ms, swap, &nbuf[doff]);
                        return 1;
                }
        }

        if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0) {
                if (type == NT_FREEBSD_VERSION && descsz == 4) {
                        *flags |= FLAGS_DID_OS_NOTE;
                        do_note_freebsd_version(ms, swap, &nbuf[doff]);
                        return 1;
                }
        }

        if (namesz == 8 && strcmp((char *)&nbuf[noff], "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((char *)&nbuf[noff], "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;
                (void)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)
{
        if (namesz == 4 && strcmp((char *)&nbuf[noff], "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;
                (void)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 << (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
        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((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;
        }

        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;
        }

        switch (os_style) {
        case OS_STYLE_NETBSD:
                if (type == NT_NETBSD_CORE_PROCINFO) {
                        char sbuf[512];
                        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'",
                            file_printable(sbuf, sizeof(sbuf),
                            (const char *)&nbuf[doff + 0x7c])) == -1)
                                return 1;
                        
                        /*
                         * Extract the signal number.  It is at
                         * offset 0x08.
                         */
                        (void)memcpy(&signo, &nbuf[doff + 0x08],
                            sizeof(signo));
                        if (file_printf(ms, " (signal %u)",
                            elf_getu32(swap, signo)) == -1)
                                return 1;
                        *flags |= FLAGS_DID_CORE;
                        return 1;
                }
                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 = (unsigned char *)
                                    &nbuf[doff + prpsoffsets(i)];
                                for (cp = cname; *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'",
                                    (int)(cp - cname), 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) < (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 ((buflen = pread(fd, buf, 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((unsigned char)*bptr); bptr++)
                continue;
        if (*bptr != '\0')
                return 0;

        return bptr - buf;
}


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 (type != NT_AUXV || (*flags & FLAGS_IS_CORE) == 0)
                return 0;

        *flags |= FLAGS_DID_AUXV;

        nval = 0;
        for (size_t off = 0; off + elsize <= descsz; off += elsize) {
                (void)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 0;
                } else {
                        if (file_printf(ms, ", %s: %d", tag, (int) xauxv_val)
                            == -1)
                                return 0;
                }
        }
        return 1;
#else
        return 0;
#endif
}

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;
        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;
        }

        (void)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) {
            (void)file_printf(ms, ", bad note name size 0x%lx",
                (unsigned long)namesz);
            return 0;
        }

        if (descsz & 0x80000000) {
            (void)file_printf(ms, ", bad note description size 0x%lx",
                (unsigned long)descsz);
            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((char *)&nbuf[noff], "NetBSD") == 0) {
                if (descsz > 100)
                        descsz = 100;
                switch (xnh_type) {
                case NT_NETBSD_VERSION:
                        return offset;
                case NT_NETBSD_MARCH:
                        if (*flags & FLAGS_DID_NETBSD_MARCH)
                                return offset;
                        *flags |= FLAGS_DID_NETBSD_MARCH;
                        if (file_printf(ms, ", compiled for: %.*s",
                            (int)descsz, (const char *)&nbuf[doff]) == -1)
                                return offset;
                        break;
                case NT_NETBSD_CMODEL:
                        if (*flags & FLAGS_DID_NETBSD_CMODEL)
                                return offset;
                        *flags |= FLAGS_DID_NETBSD_CMODEL;
                        if (file_printf(ms, ", compiler model: %.*s",
                            (int)descsz, (const char *)&nbuf[doff]) == -1)
                                return offset;
                        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;
                        break;
                }
                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;
        size_t nbadcap = 0;
        void *nbuf;
        off_t noff, coff, name_off;
        uint64_t cap_hw1 = 0;   /* SunOS 5.x hardware capabilites */
        uint64_t cap_sf1 = 0;   /* SunOS 5.x software capabilites */
        char name[50];
        ssize_t namesize;

        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)))
            < (ssize_t)xsh_sizeof) {
                file_badread(ms);
                return -1;
        }
        name_off = xsh_offset;

        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)
                        stripped = 0;

                if (pread(fd, xsh_addr, xsh_sizeof, off) < (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 ((uintmax_t)(xsh_size + xsh_offset) >
                            (uintmax_t)fsize) {
                                if (file_printf(ms,
                                    ", note offset/size 0x%" INTMAX_T_FORMAT
                                    "x+0x%" INTMAX_T_FORMAT "x exceeds"
                                    " file size 0x%" INTMAX_T_FORMAT "x",
                                    (uintmax_t)xsh_offset, (uintmax_t)xsh_size,
                                    (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) <
                            (ssize_t)xsh_size) {
                                file_badread(ms);
                                free(nbuf);
                                return -1;
                        }

                        noff = 0;
                        for (;;) {
                                if (noff >= (off_t)xsh_size)
                                        break;
                                noff = donote(ms, nbuf, (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) == (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) > (off_t)xsh_size)
                                        break;
                                if (read(fd, cbuf, (size_t)xcap_sizeof) !=
                                    (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;
                                }
                                (void)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 "
                                            "0x%" INT64_T_FORMAT "x = 0x%"
                                            INT64_T_FORMAT "x",
                                            (unsigned long long)xcap_tag,
                                            (unsigned long long)xcap_val) == -1)
                                                return -1;
                                        if (nbadcap++ > 2)
                                                coff = xsh_size;
                                        break;
                                }
                        }
                        /*FALLTHROUGH*/
                skip:
                default:
                        break;
                }
        }

        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 0x%"
                                    INT64_T_FORMAT "x",
                                    (unsigned long long)cap_hw1) == -1)
                                        return -1;
                } else {
                        if (file_printf(ms,
                            " hardware capability 0x%" INT64_T_FORMAT "x",
                            (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 0x%"
                            INT64_T_FORMAT "x",
                            (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";
        const char *interp = "";
        unsigned char nbuf[BUFSIZ];
        char ibuf[BUFSIZ];
        ssize_t bufsize;
        size_t offset, align, len;
        
        if (size != xph_sizeof) {
                if (file_printf(ms, ", corrupted program header size") == -1)
                        return -1;
                return 0;
        }

        for ( ; num; num--) {
                if (pread(fd, xph_addr, xph_sizeof, off) < (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:
                        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 0x%lx",
                                    (unsigned long)align) == -1)
                                        return -1;
                                align = 4;
                        }
                        /*FALLTHROUGH*/
                case PT_INTERP:
                        len = xph_filesz < sizeof(nbuf) ? xph_filesz
                            : sizeof(nbuf);
                        bufsize = pread(fd, nbuf, len, xph_offset);
                        if (bufsize == -1) {
                                file_badread(ms);
                                return -1;
                        }
                        break;
                default:
                        if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
                                /* Maybe warn here? */
                                continue;
                        }
                        break;
                }

                /* Things we can determine when we seek */
                switch (xph_type) {
                case PT_INTERP:
                        if (bufsize && nbuf[0]) {
                                nbuf[bufsize - 1] = '\0';
                                interp = (const char *)nbuf;
                        } else
                                interp = "*empty*";
                        break;
                case PT_NOTE:
                        /*
                         * This is a PT_NOTE section; loop through all the notes
                         * in the section.
                         */
                        offset = 0;
                        for (;;) {
                                if (offset >= (size_t)bufsize)
                                        break;
                                offset = donote(ms, nbuf, offset,
                                    (size_t)bufsize, clazz, swap, align,
                                    flags, notecount, fd, 0, 0, 0);
                                if (offset == 0)
                                        break;
                        }
                        break;
                default:
                        break;
                }
        }
        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)) == -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 clazz;
        int swap;
        struct stat st;
        off_t fsize;
        int flags = 0;
        Elf32_Ehdr elf32hdr;
        Elf64_Ehdr elf64hdr;
        uint16_t type, phnum, shnum, notecount;

        if (ms->flags & (MAGIC_MIME|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, (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;
        }
        if (S_ISREG(st.st_mode) || st.st_size != 0)
                fsize = st.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