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- /*
- * 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 1.144 2018/07/08 23:37:33 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 (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 \
- ? 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 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_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 (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 >= (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;
- 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;
- 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 >= 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((char *)&nbuf[noff], "Go") == 0 &&
- type == NT_GO_BUILD_ID && descsz < 128) {
- if (file_printf(ms, ", Go BuildID=%s",
- (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)
- {
- 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];
- 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;
- 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;
- 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;
- *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, descsz);
- 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),
- CAST(char *, pi.cpi_name)),
- elf_getu32(swap, (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, (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;
- 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 < 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'",
- (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, 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((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 0;
- } else {
- if (file_printf(ms, ", %s: %d", tag, (int) xauxv_val)
- == -1)
- return 0;
- }
- }
- 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;
- 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;
- }
- 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) {
- file_printf(ms, ", bad note name size %#lx",
- CAST(unsigned long, namesz));
- return 0;
- }
- if (descsz & 0x80000000) {
- file_printf(ms, ", bad note description size %#lx",
- CAST(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(CAST(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 = CAST(const char *, &nbuf[doff]);
- descw = CAST(int, descsz);
- *flags |= flag;
- file_printf(ms, ", %s: %.*s", tag, 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 (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;
- 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 (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:
- linking_style = "dynamically";
- doread = 1;
- 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;
- for (;;) {
- if (offset >= (size_t)bufsize)
- break;
- offset = dodynamic(ms, nbuf, offset,
- CAST(size_t, bufsize), clazz, swap);
- if (offset == 0)
- break;
- }
- break;
- case PT_INTERP:
- if (bufsize && nbuf[0]) {
- nbuf[bufsize - 1] = '\0';
- memcpy(interp, nbuf, bufsize);
- } else
- strlcpy(interp, "*empty*", sizeof(interp));
- 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,
- CAST(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, const struct buffer *b)
- {
- int fd = b->fd;
- const unsigned char *buf = b->fbuf;
- size_t nbytes = b->flen;
- 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, CAST(off_t, 0), SEEK_SET) == CAST(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
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