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dac6a0d559
freebsd/usr.bin/elfdump/elfdump.c
Brooks Davis c35530f464 elfdump: Add -E to test if a file is an ELF binary. 
This is intended to replace potentially unreliable checks like:

	file -b $1 | grep -q '^ELF ..-bit .SB executable'

Reviewed by:	emaste
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D15971
2018-11-05 22:53:50 +00:00

1270 lines
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2003 David O'Brien. All rights reserved.
* Copyright (c) 2001 Jake Burkholder
* 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, 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/capsicum.h>
#include <sys/elf32.h>
#include <sys/elf64.h>
#include <sys/endian.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <capsicum_helpers.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define ED_DYN (1<<0)
#define ED_EHDR (1<<1)
#define ED_GOT (1<<2)
#define ED_HASH (1<<3)
#define ED_INTERP (1<<4)
#define ED_NOTE (1<<5)
#define ED_PHDR (1<<6)
#define ED_REL (1<<7)
#define ED_SHDR (1<<8)
#define ED_SYMTAB (1<<9)
#define ED_ALL ((1<<10)-1)
#define ED_IS_ELF (1<<10) /* Exclusive with other flags */
#define elf_get_addr elf_get_quad
#define elf_get_off elf_get_quad
#define elf_get_size elf_get_quad
enum elf_member {
D_TAG = 1, D_PTR, D_VAL,
E_CLASS, E_DATA, E_OSABI, E_TYPE, E_MACHINE, E_VERSION, E_ENTRY,
E_PHOFF, E_SHOFF, E_FLAGS, E_EHSIZE, E_PHENTSIZE, E_PHNUM, E_SHENTSIZE,
E_SHNUM, E_SHSTRNDX,
N_NAMESZ, N_DESCSZ, N_TYPE,
P_TYPE, P_OFFSET, P_VADDR, P_PADDR, P_FILESZ, P_MEMSZ, P_FLAGS,
P_ALIGN,
SH_NAME, SH_TYPE, SH_FLAGS, SH_ADDR, SH_OFFSET, SH_SIZE, SH_LINK,
SH_INFO, SH_ADDRALIGN, SH_ENTSIZE,
ST_NAME, ST_VALUE, ST_SIZE, ST_INFO, ST_SHNDX,
R_OFFSET, R_INFO,
RA_OFFSET, RA_INFO, RA_ADDEND
};
typedef enum elf_member elf_member_t;
static int elf32_offsets[] = {
0,
offsetof(Elf32_Dyn, d_tag), offsetof(Elf32_Dyn, d_un.d_ptr),
offsetof(Elf32_Dyn, d_un.d_val),
offsetof(Elf32_Ehdr, e_ident[EI_CLASS]),
offsetof(Elf32_Ehdr, e_ident[EI_DATA]),
offsetof(Elf32_Ehdr, e_ident[EI_OSABI]),
offsetof(Elf32_Ehdr, e_type), offsetof(Elf32_Ehdr, e_machine),
offsetof(Elf32_Ehdr, e_version), offsetof(Elf32_Ehdr, e_entry),
offsetof(Elf32_Ehdr, e_phoff), offsetof(Elf32_Ehdr, e_shoff),
offsetof(Elf32_Ehdr, e_flags), offsetof(Elf32_Ehdr, e_ehsize),
offsetof(Elf32_Ehdr, e_phentsize), offsetof(Elf32_Ehdr, e_phnum),
offsetof(Elf32_Ehdr, e_shentsize), offsetof(Elf32_Ehdr, e_shnum),
offsetof(Elf32_Ehdr, e_shstrndx),
offsetof(Elf_Note, n_namesz), offsetof(Elf_Note, n_descsz),
offsetof(Elf_Note, n_type),
offsetof(Elf32_Phdr, p_type), offsetof(Elf32_Phdr, p_offset),
offsetof(Elf32_Phdr, p_vaddr), offsetof(Elf32_Phdr, p_paddr),
offsetof(Elf32_Phdr, p_filesz), offsetof(Elf32_Phdr, p_memsz),
offsetof(Elf32_Phdr, p_flags), offsetof(Elf32_Phdr, p_align),
offsetof(Elf32_Shdr, sh_name), offsetof(Elf32_Shdr, sh_type),
offsetof(Elf32_Shdr, sh_flags), offsetof(Elf32_Shdr, sh_addr),
offsetof(Elf32_Shdr, sh_offset), offsetof(Elf32_Shdr, sh_size),
offsetof(Elf32_Shdr, sh_link), offsetof(Elf32_Shdr, sh_info),
offsetof(Elf32_Shdr, sh_addralign), offsetof(Elf32_Shdr, sh_entsize),
offsetof(Elf32_Sym, st_name), offsetof(Elf32_Sym, st_value),
offsetof(Elf32_Sym, st_size), offsetof(Elf32_Sym, st_info),
offsetof(Elf32_Sym, st_shndx),
offsetof(Elf32_Rel, r_offset), offsetof(Elf32_Rel, r_info),
offsetof(Elf32_Rela, r_offset), offsetof(Elf32_Rela, r_info),
offsetof(Elf32_Rela, r_addend)
};
static int elf64_offsets[] = {
0,
offsetof(Elf64_Dyn, d_tag), offsetof(Elf64_Dyn, d_un.d_ptr),
offsetof(Elf64_Dyn, d_un.d_val),
offsetof(Elf32_Ehdr, e_ident[EI_CLASS]),
offsetof(Elf32_Ehdr, e_ident[EI_DATA]),
offsetof(Elf32_Ehdr, e_ident[EI_OSABI]),
offsetof(Elf64_Ehdr, e_type), offsetof(Elf64_Ehdr, e_machine),
offsetof(Elf64_Ehdr, e_version), offsetof(Elf64_Ehdr, e_entry),
offsetof(Elf64_Ehdr, e_phoff), offsetof(Elf64_Ehdr, e_shoff),
offsetof(Elf64_Ehdr, e_flags), offsetof(Elf64_Ehdr, e_ehsize),
offsetof(Elf64_Ehdr, e_phentsize), offsetof(Elf64_Ehdr, e_phnum),
offsetof(Elf64_Ehdr, e_shentsize), offsetof(Elf64_Ehdr, e_shnum),
offsetof(Elf64_Ehdr, e_shstrndx),
offsetof(Elf_Note, n_namesz), offsetof(Elf_Note, n_descsz),
offsetof(Elf_Note, n_type),
offsetof(Elf64_Phdr, p_type), offsetof(Elf64_Phdr, p_offset),
offsetof(Elf64_Phdr, p_vaddr), offsetof(Elf64_Phdr, p_paddr),
offsetof(Elf64_Phdr, p_filesz), offsetof(Elf64_Phdr, p_memsz),
offsetof(Elf64_Phdr, p_flags), offsetof(Elf64_Phdr, p_align),
offsetof(Elf64_Shdr, sh_name), offsetof(Elf64_Shdr, sh_type),
offsetof(Elf64_Shdr, sh_flags), offsetof(Elf64_Shdr, sh_addr),
offsetof(Elf64_Shdr, sh_offset), offsetof(Elf64_Shdr, sh_size),
offsetof(Elf64_Shdr, sh_link), offsetof(Elf64_Shdr, sh_info),
offsetof(Elf64_Shdr, sh_addralign), offsetof(Elf64_Shdr, sh_entsize),
offsetof(Elf64_Sym, st_name), offsetof(Elf64_Sym, st_value),
offsetof(Elf64_Sym, st_size), offsetof(Elf64_Sym, st_info),
offsetof(Elf64_Sym, st_shndx),
offsetof(Elf64_Rel, r_offset), offsetof(Elf64_Rel, r_info),
offsetof(Elf64_Rela, r_offset), offsetof(Elf64_Rela, r_info),
offsetof(Elf64_Rela, r_addend)
};
/* http://www.sco.com/developers/gabi/latest/ch5.dynamic.html#tag_encodings */
static const char *
d_tags(u_int64_t tag)
{
static char unknown_tag[48];
switch (tag) {
case DT_NULL: return "DT_NULL";
case DT_NEEDED: return "DT_NEEDED";
case DT_PLTRELSZ: return "DT_PLTRELSZ";
case DT_PLTGOT: return "DT_PLTGOT";
case DT_HASH: return "DT_HASH";
case DT_STRTAB: return "DT_STRTAB";
case DT_SYMTAB: return "DT_SYMTAB";
case DT_RELA: return "DT_RELA";
case DT_RELASZ: return "DT_RELASZ";
case DT_RELAENT: return "DT_RELAENT";
case DT_STRSZ: return "DT_STRSZ";
case DT_SYMENT: return "DT_SYMENT";
case DT_INIT: return "DT_INIT";
case DT_FINI: return "DT_FINI";
case DT_SONAME: return "DT_SONAME";
case DT_RPATH: return "DT_RPATH";
case DT_SYMBOLIC: return "DT_SYMBOLIC";
case DT_REL: return "DT_REL";
case DT_RELSZ: return "DT_RELSZ";
case DT_RELENT: return "DT_RELENT";
case DT_PLTREL: return "DT_PLTREL";
case DT_DEBUG: return "DT_DEBUG";
case DT_TEXTREL: return "DT_TEXTREL";
case DT_JMPREL: return "DT_JMPREL";
case DT_BIND_NOW: return "DT_BIND_NOW";
case DT_INIT_ARRAY: return "DT_INIT_ARRAY";
case DT_FINI_ARRAY: return "DT_FINI_ARRAY";
case DT_INIT_ARRAYSZ: return "DT_INIT_ARRAYSZ";
case DT_FINI_ARRAYSZ: return "DT_FINI_ARRAYSZ";
case DT_RUNPATH: return "DT_RUNPATH";
case DT_FLAGS: return "DT_FLAGS";
case DT_PREINIT_ARRAY: return "DT_PREINIT_ARRAY"; /* XXX DT_ENCODING */
case DT_PREINIT_ARRAYSZ:return "DT_PREINIT_ARRAYSZ";
/* 0x6000000D - 0x6ffff000 operating system-specific semantics */
case 0x6ffffdf5: return "DT_GNU_PRELINKED";
case 0x6ffffdf6: return "DT_GNU_CONFLICTSZ";
case 0x6ffffdf7: return "DT_GNU_LIBLISTSZ";
case 0x6ffffdf8: return "DT_SUNW_CHECKSUM";
case DT_PLTPADSZ: return "DT_PLTPADSZ";
case DT_MOVEENT: return "DT_MOVEENT";
case DT_MOVESZ: return "DT_MOVESZ";
case DT_FEATURE: return "DT_FEATURE";
case DT_POSFLAG_1: return "DT_POSFLAG_1";
case DT_SYMINSZ: return "DT_SYMINSZ";
case DT_SYMINENT : return "DT_SYMINENT (DT_VALRNGHI)";
case DT_ADDRRNGLO: return "DT_ADDRRNGLO";
case DT_GNU_HASH: return "DT_GNU_HASH";
case 0x6ffffef8: return "DT_GNU_CONFLICT";
case 0x6ffffef9: return "DT_GNU_LIBLIST";
case DT_CONFIG: return "DT_CONFIG";
case DT_DEPAUDIT: return "DT_DEPAUDIT";
case DT_AUDIT: return "DT_AUDIT";
case DT_PLTPAD: return "DT_PLTPAD";
case DT_MOVETAB: return "DT_MOVETAB";
case DT_SYMINFO : return "DT_SYMINFO (DT_ADDRRNGHI)";
case DT_RELACOUNT: return "DT_RELACOUNT";
case DT_RELCOUNT: return "DT_RELCOUNT";
case DT_FLAGS_1: return "DT_FLAGS_1";
case DT_VERDEF: return "DT_VERDEF";
case DT_VERDEFNUM: return "DT_VERDEFNUM";
case DT_VERNEED: return "DT_VERNEED";
case DT_VERNEEDNUM: return "DT_VERNEEDNUM";
case 0x6ffffff0: return "DT_GNU_VERSYM";
/* 0x70000000 - 0x7fffffff processor-specific semantics */
case 0x70000000: return "DT_IA_64_PLT_RESERVE";
case DT_AUXILIARY: return "DT_AUXILIARY";
case DT_USED: return "DT_USED";
case DT_FILTER: return "DT_FILTER";
}
snprintf(unknown_tag, sizeof(unknown_tag),
"ERROR: TAG NOT DEFINED -- tag 0x%jx", (uintmax_t)tag);
return (unknown_tag);
}
static const char *
e_machines(u_int mach)
{
static char machdesc[64];
switch (mach) {
case EM_NONE: return "EM_NONE";
case EM_M32: return "EM_M32";
case EM_SPARC: return "EM_SPARC";
case EM_386: return "EM_386";
case EM_68K: return "EM_68K";
case EM_88K: return "EM_88K";
case EM_IAMCU: return "EM_IAMCU";
case EM_860: return "EM_860";
case EM_MIPS: return "EM_MIPS";
case EM_PPC: return "EM_PPC";
case EM_PPC64: return "EM_PPC64";
case EM_ARM: return "EM_ARM";
case EM_ALPHA: return "EM_ALPHA (legacy)";
case EM_SPARCV9:return "EM_SPARCV9";
case EM_IA_64: return "EM_IA_64";
case EM_X86_64: return "EM_X86_64";
case EM_AARCH64:return "EM_AARCH64";
case EM_RISCV: return "EM_RISCV";
}
snprintf(machdesc, sizeof(machdesc),
"(unknown machine) -- type 0x%x", mach);
return (machdesc);
}
static const char *e_types[] = {
"ET_NONE", "ET_REL", "ET_EXEC", "ET_DYN", "ET_CORE"
};
static const char *ei_versions[] = {
"EV_NONE", "EV_CURRENT"
};
static const char *ei_classes[] = {
"ELFCLASSNONE", "ELFCLASS32", "ELFCLASS64"
};
static const char *ei_data[] = {
"ELFDATANONE", "ELFDATA2LSB", "ELFDATA2MSB"
};
static const char *ei_abis[256] = {
"ELFOSABI_NONE", "ELFOSABI_HPUX", "ELFOSABI_NETBSD", "ELFOSABI_LINUX",
"ELFOSABI_HURD", "ELFOSABI_86OPEN", "ELFOSABI_SOLARIS", "ELFOSABI_AIX",
"ELFOSABI_IRIX", "ELFOSABI_FREEBSD", "ELFOSABI_TRU64",
"ELFOSABI_MODESTO", "ELFOSABI_OPENBSD",
[255] = "ELFOSABI_STANDALONE"
};
static const char *p_types[] = {
"PT_NULL", "PT_LOAD", "PT_DYNAMIC", "PT_INTERP", "PT_NOTE",
"PT_SHLIB", "PT_PHDR", "PT_TLS"
};
static const char *p_flags[] = {
"", "PF_X", "PF_W", "PF_X|PF_W", "PF_R", "PF_X|PF_R", "PF_W|PF_R",
"PF_X|PF_W|PF_R"
};
/* http://www.sco.com/developers/gabi/latest/ch4.sheader.html#sh_type */
static const char *
sh_types(uint64_t machine, uint64_t sht) {
static char unknown_buf[64];
if (sht < 0x60000000) {
switch (sht) {
case SHT_NULL: return "SHT_NULL";
case SHT_PROGBITS: return "SHT_PROGBITS";
case SHT_SYMTAB: return "SHT_SYMTAB";
case SHT_STRTAB: return "SHT_STRTAB";
case SHT_RELA: return "SHT_RELA";
case SHT_HASH: return "SHT_HASH";
case SHT_DYNAMIC: return "SHT_DYNAMIC";
case SHT_NOTE: return "SHT_NOTE";
case SHT_NOBITS: return "SHT_NOBITS";
case SHT_REL: return "SHT_REL";
case SHT_SHLIB: return "SHT_SHLIB";
case SHT_DYNSYM: return "SHT_DYNSYM";
case SHT_INIT_ARRAY: return "SHT_INIT_ARRAY";
case SHT_FINI_ARRAY: return "SHT_FINI_ARRAY";
case SHT_PREINIT_ARRAY: return "SHT_PREINIT_ARRAY";
case SHT_GROUP: return "SHT_GROUP";
case SHT_SYMTAB_SHNDX: return "SHT_SYMTAB_SHNDX";
}
snprintf(unknown_buf, sizeof(unknown_buf),
"ERROR: SHT %ju NOT DEFINED", (uintmax_t)sht);
return (unknown_buf);
} else if (sht < 0x70000000) {
/* 0x60000000-0x6fffffff operating system-specific semantics */
switch (sht) {
case 0x6ffffff0: return "XXX:VERSYM";
case SHT_SUNW_dof: return "SHT_SUNW_dof";
case SHT_GNU_HASH: return "SHT_GNU_HASH";
case 0x6ffffff7: return "SHT_GNU_LIBLIST";
case 0x6ffffffc: return "XXX:VERDEF";
case SHT_SUNW_verdef: return "SHT_SUNW(GNU)_verdef";
case SHT_SUNW_verneed: return "SHT_SUNW(GNU)_verneed";
case SHT_SUNW_versym: return "SHT_SUNW(GNU)_versym";
}
snprintf(unknown_buf, sizeof(unknown_buf),
"ERROR: OS-SPECIFIC SHT 0x%jx NOT DEFINED",
(uintmax_t)sht);
return (unknown_buf);
} else if (sht < 0x80000000) {
/* 0x70000000-0x7fffffff processor-specific semantics */
switch (machine) {
case EM_ARM:
switch (sht) {
case SHT_ARM_EXIDX: return "SHT_ARM_EXIDX";
case SHT_ARM_PREEMPTMAP:return "SHT_ARM_PREEMPTMAP";
case SHT_ARM_ATTRIBUTES:return "SHT_ARM_ATTRIBUTES";
case SHT_ARM_DEBUGOVERLAY:
return "SHT_ARM_DEBUGOVERLAY";
case SHT_ARM_OVERLAYSECTION:
return "SHT_ARM_OVERLAYSECTION";
}
break;
case EM_IA_64:
switch (sht) {
case 0x70000000: return "SHT_IA_64_EXT";
case 0x70000001: return "SHT_IA_64_UNWIND";
}
break;
case EM_MIPS:
switch (sht) {
case SHT_MIPS_REGINFO: return "SHT_MIPS_REGINFO";
case SHT_MIPS_OPTIONS: return "SHT_MIPS_OPTIONS";
case SHT_MIPS_ABIFLAGS: return "SHT_MIPS_ABIFLAGS";
}
break;
}
switch (sht) {
case 0x7ffffffd: return "XXX:AUXILIARY";
case 0x7fffffff: return "XXX:FILTER";
}
snprintf(unknown_buf, sizeof(unknown_buf),
"ERROR: PROCESSOR-SPECIFIC SHT 0x%jx NOT DEFINED",
(uintmax_t)sht);
return (unknown_buf);
} else {
/* 0x80000000-0xffffffff application programs */
snprintf(unknown_buf, sizeof(unknown_buf),
"ERROR: SHT 0x%jx NOT DEFINED",
(uintmax_t)sht);
return (unknown_buf);
}
}
static const char *sh_flags[] = {
"", "SHF_WRITE", "SHF_ALLOC", "SHF_WRITE|SHF_ALLOC", "SHF_EXECINSTR",
"SHF_WRITE|SHF_EXECINSTR", "SHF_ALLOC|SHF_EXECINSTR",
"SHF_WRITE|SHF_ALLOC|SHF_EXECINSTR"
};
static const char *
st_type(unsigned int mach, unsigned int type)
{
static char s_type[32];
switch (type) {
case STT_NOTYPE: return "STT_NOTYPE";
case STT_OBJECT: return "STT_OBJECT";
case STT_FUNC: return "STT_FUNC";
case STT_SECTION: return "STT_SECTION";
case STT_FILE: return "STT_FILE";
case STT_COMMON: return "STT_COMMON";
case STT_TLS: return "STT_TLS";
case 13:
if (mach == EM_SPARCV9)
return "STT_SPARC_REGISTER";
break;
}
snprintf(s_type, sizeof(s_type), "<unknown: %#x>", type);
return (s_type);
}
static const char *st_bindings[] = {
"STB_LOCAL", "STB_GLOBAL", "STB_WEAK"
};
static char *dynstr;
static char *shstrtab;
static char *strtab;
static FILE *out;
static u_int64_t elf_get_byte(Elf32_Ehdr *e, void *base, elf_member_t member);
static u_int64_t elf_get_quarter(Elf32_Ehdr *e, void *base,
elf_member_t member);
#if 0
static u_int64_t elf_get_half(Elf32_Ehdr *e, void *base, elf_member_t member);
#endif
static u_int64_t elf_get_word(Elf32_Ehdr *e, void *base, elf_member_t member);
static u_int64_t elf_get_quad(Elf32_Ehdr *e, void *base, elf_member_t member);
static void elf_print_ehdr(Elf32_Ehdr *e, void *sh);
static void elf_print_phdr(Elf32_Ehdr *e, void *p);
static void elf_print_shdr(Elf32_Ehdr *e, void *sh);
static void elf_print_symtab(Elf32_Ehdr *e, void *sh, char *str);
static void elf_print_dynamic(Elf32_Ehdr *e, void *sh);
static void elf_print_rel(Elf32_Ehdr *e, void *r);
static void elf_print_rela(Elf32_Ehdr *e, void *ra);
static void elf_print_interp(Elf32_Ehdr *e, void *p);
static void elf_print_got(Elf32_Ehdr *e, void *sh);
static void elf_print_hash(Elf32_Ehdr *e, void *sh);
static void elf_print_note(Elf32_Ehdr *e, void *sh);
static void usage(void);
/*
* Helpers for ELF files with shnum or shstrndx values that don't fit in the
* ELF header. If the values are too large then an escape value is used to
* indicate that the actual value is found in one of section 0's fields.
*/
static uint64_t
elf_get_shnum(Elf32_Ehdr *e, void *sh)
{
uint64_t shnum;
shnum = elf_get_quarter(e, e, E_SHNUM);
if (shnum == 0)
shnum = elf_get_word(e, (char *)sh, SH_SIZE);
return shnum;
}
static uint64_t
elf_get_shstrndx(Elf32_Ehdr *e, void *sh)
{
uint64_t shstrndx;
shstrndx = elf_get_quarter(e, e, E_SHSTRNDX);
if (shstrndx == SHN_XINDEX)
shstrndx = elf_get_word(e, (char *)sh, SH_LINK);
return shstrndx;
}
int
main(int ac, char **av)
{
cap_rights_t rights;
u_int64_t phoff;
u_int64_t shoff;
u_int64_t phentsize;
u_int64_t phnum;
u_int64_t shentsize;
u_int64_t shnum;
u_int64_t shstrndx;
u_int64_t offset;
u_int64_t name;
u_int64_t type;
struct stat sb;
u_int flags;
Elf32_Ehdr *e;
void *p;
void *sh;
void *v;
int fd;
int ch;
int i;
out = stdout;
flags = 0;
while ((ch = getopt(ac, av, "acdEeiGhnprsw:")) != -1)
switch (ch) {
case 'a':
flags = ED_ALL;
break;
case 'c':
flags |= ED_SHDR;
break;
case 'd':
flags |= ED_DYN;
break;
case 'E':
flags = ED_IS_ELF;
break;
case 'e':
flags |= ED_EHDR;
break;
case 'i':
flags |= ED_INTERP;
break;
case 'G':
flags |= ED_GOT;
break;
case 'h':
flags |= ED_HASH;
break;
case 'n':
flags |= ED_NOTE;
break;
case 'p':
flags |= ED_PHDR;
break;
case 'r':
flags |= ED_REL;
break;
case 's':
flags |= ED_SYMTAB;
break;
case 'w':
if ((out = fopen(optarg, "w")) == NULL)
err(1, "%s", optarg);
cap_rights_init(&rights, CAP_FSTAT, CAP_WRITE);
if (caph_rights_limit(fileno(out), &rights) < 0)
err(1, "unable to limit rights for %s", optarg);
break;
case '?':
default:
usage();
}
ac -= optind;
av += optind;
if (ac == 0 || flags == 0 || ((flags & ED_IS_ELF) &&
(ac != 1 || (flags & ~ED_IS_ELF) || out != stdout)))
usage();
if ((fd = open(*av, O_RDONLY)) < 0 ||
fstat(fd, &sb) < 0)
err(1, "%s", *av);
cap_rights_init(&rights, CAP_MMAP_R);
if (caph_rights_limit(fd, &rights) < 0)
err(1, "unable to limit rights for %s", *av);
cap_rights_init(&rights);
if (caph_rights_limit(STDIN_FILENO, &rights) < 0 ||
caph_limit_stdout() < 0 || caph_limit_stderr() < 0) {
err(1, "unable to limit rights for stdio");
}
if (caph_enter() < 0)
err(1, "unable to enter capability mode");
e = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (e == MAP_FAILED)
err(1, NULL);
if (!IS_ELF(*(Elf32_Ehdr *)e)) {
if (flags & ED_IS_ELF)
exit(1);
errx(1, "not an elf file");
} else if (flags & ED_IS_ELF)
exit (0);
phoff = elf_get_off(e, e, E_PHOFF);
shoff = elf_get_off(e, e, E_SHOFF);
phentsize = elf_get_quarter(e, e, E_PHENTSIZE);
phnum = elf_get_quarter(e, e, E_PHNUM);
shentsize = elf_get_quarter(e, e, E_SHENTSIZE);
p = (char *)e + phoff;
if (shoff > 0) {
sh = (char *)e + shoff;
shnum = elf_get_shnum(e, sh);
shstrndx = elf_get_shstrndx(e, sh);
offset = elf_get_off(e, (char *)sh + shstrndx * shentsize,
SH_OFFSET);
shstrtab = (char *)e + offset;
} else {
sh = NULL;
shnum = 0;
shstrndx = 0;
shstrtab = NULL;
}
for (i = 0; (u_int64_t)i < shnum; i++) {
name = elf_get_word(e, (char *)sh + i * shentsize, SH_NAME);
offset = elf_get_off(e, (char *)sh + i * shentsize, SH_OFFSET);
if (strcmp(shstrtab + name, ".strtab") == 0)
strtab = (char *)e + offset;
if (strcmp(shstrtab + name, ".dynstr") == 0)
dynstr = (char *)e + offset;
}
if (flags & ED_EHDR)
elf_print_ehdr(e, sh);
if (flags & ED_PHDR)
elf_print_phdr(e, p);
if (flags & ED_SHDR)
elf_print_shdr(e, sh);
for (i = 0; (u_int64_t)i < phnum; i++) {
v = (char *)p + i * phentsize;
type = elf_get_word(e, v, P_TYPE);
switch (type) {
case PT_INTERP:
if (flags & ED_INTERP)
elf_print_interp(e, v);
break;
case PT_NULL:
case PT_LOAD:
case PT_DYNAMIC:
case PT_NOTE:
case PT_SHLIB:
case PT_PHDR:
break;
}
}
for (i = 0; (u_int64_t)i < shnum; i++) {
v = (char *)sh + i * shentsize;
type = elf_get_word(e, v, SH_TYPE);
switch (type) {
case SHT_SYMTAB:
if (flags & ED_SYMTAB)
elf_print_symtab(e, v, strtab);
break;
case SHT_DYNAMIC:
if (flags & ED_DYN)
elf_print_dynamic(e, v);
break;
case SHT_RELA:
if (flags & ED_REL)
elf_print_rela(e, v);
break;
case SHT_REL:
if (flags & ED_REL)
elf_print_rel(e, v);
break;
case SHT_NOTE:
name = elf_get_word(e, v, SH_NAME);
if (flags & ED_NOTE &&
strcmp(shstrtab + name, ".note.tag") == 0)
elf_print_note(e, v);
break;
case SHT_DYNSYM:
if (flags & ED_SYMTAB)
elf_print_symtab(e, v, dynstr);
break;
case SHT_PROGBITS:
name = elf_get_word(e, v, SH_NAME);
if (flags & ED_GOT &&
strcmp(shstrtab + name, ".got") == 0)
elf_print_got(e, v);
break;
case SHT_HASH:
if (flags & ED_HASH)
elf_print_hash(e, v);
break;
case SHT_NULL:
case SHT_STRTAB:
case SHT_NOBITS:
case SHT_SHLIB:
break;
}
}
return 0;
}
static void
elf_print_ehdr(Elf32_Ehdr *e, void *sh)
{
u_int64_t class;
u_int64_t data;
u_int64_t osabi;
u_int64_t type;
u_int64_t machine;
u_int64_t version;
u_int64_t entry;
u_int64_t phoff;
u_int64_t shoff;
u_int64_t flags;
u_int64_t ehsize;
u_int64_t phentsize;
u_int64_t phnum;
u_int64_t shentsize;
u_int64_t shnum;
u_int64_t shstrndx;
class = elf_get_byte(e, e, E_CLASS);
data = elf_get_byte(e, e, E_DATA);
osabi = elf_get_byte(e, e, E_OSABI);
type = elf_get_quarter(e, e, E_TYPE);
machine = elf_get_quarter(e, e, E_MACHINE);
version = elf_get_word(e, e, E_VERSION);
entry = elf_get_addr(e, e, E_ENTRY);
phoff = elf_get_off(e, e, E_PHOFF);
shoff = elf_get_off(e, e, E_SHOFF);
flags = elf_get_word(e, e, E_FLAGS);
ehsize = elf_get_quarter(e, e, E_EHSIZE);
phentsize = elf_get_quarter(e, e, E_PHENTSIZE);
phnum = elf_get_quarter(e, e, E_PHNUM);
shentsize = elf_get_quarter(e, e, E_SHENTSIZE);
fprintf(out, "\nelf header:\n");
fprintf(out, "\n");
fprintf(out, "\te_ident: %s %s %s\n", ei_classes[class], ei_data[data],
ei_abis[osabi]);
fprintf(out, "\te_type: %s\n", e_types[type]);
fprintf(out, "\te_machine: %s\n", e_machines(machine));
fprintf(out, "\te_version: %s\n", ei_versions[version]);
fprintf(out, "\te_entry: %#jx\n", (intmax_t)entry);
fprintf(out, "\te_phoff: %jd\n", (intmax_t)phoff);
fprintf(out, "\te_shoff: %jd\n", (intmax_t)shoff);
fprintf(out, "\te_flags: %jd\n", (intmax_t)flags);
fprintf(out, "\te_ehsize: %jd\n", (intmax_t)ehsize);
fprintf(out, "\te_phentsize: %jd\n", (intmax_t)phentsize);
fprintf(out, "\te_phnum: %jd\n", (intmax_t)phnum);
fprintf(out, "\te_shentsize: %jd\n", (intmax_t)shentsize);
if (sh != NULL) {
shnum = elf_get_shnum(e, sh);
shstrndx = elf_get_shstrndx(e, sh);
fprintf(out, "\te_shnum: %jd\n", (intmax_t)shnum);
fprintf(out, "\te_shstrndx: %jd\n", (intmax_t)shstrndx);
}
}
static void
elf_print_phdr(Elf32_Ehdr *e, void *p)
{
u_int64_t phentsize;
u_int64_t phnum;
u_int64_t type;
u_int64_t offset;
u_int64_t vaddr;
u_int64_t paddr;
u_int64_t filesz;
u_int64_t memsz;
u_int64_t flags;
u_int64_t align;
void *v;
int i;
phentsize = elf_get_quarter(e, e, E_PHENTSIZE);
phnum = elf_get_quarter(e, e, E_PHNUM);
fprintf(out, "\nprogram header:\n");
for (i = 0; (u_int64_t)i < phnum; i++) {
v = (char *)p + i * phentsize;
type = elf_get_word(e, v, P_TYPE);
offset = elf_get_off(e, v, P_OFFSET);
vaddr = elf_get_addr(e, v, P_VADDR);
paddr = elf_get_addr(e, v, P_PADDR);
filesz = elf_get_size(e, v, P_FILESZ);
memsz = elf_get_size(e, v, P_MEMSZ);
flags = elf_get_word(e, v, P_FLAGS);
align = elf_get_size(e, v, P_ALIGN);
fprintf(out, "\n");
fprintf(out, "entry: %d\n", i);
fprintf(out, "\tp_type: %s\n", p_types[type & 0x7]);
fprintf(out, "\tp_offset: %jd\n", (intmax_t)offset);
fprintf(out, "\tp_vaddr: %#jx\n", (intmax_t)vaddr);
fprintf(out, "\tp_paddr: %#jx\n", (intmax_t)paddr);
fprintf(out, "\tp_filesz: %jd\n", (intmax_t)filesz);
fprintf(out, "\tp_memsz: %jd\n", (intmax_t)memsz);
fprintf(out, "\tp_flags: %s\n", p_flags[flags]);
fprintf(out, "\tp_align: %jd\n", (intmax_t)align);
}
}
static void
elf_print_shdr(Elf32_Ehdr *e, void *sh)
{
u_int64_t shentsize;
u_int64_t shnum;
u_int64_t name;
u_int64_t type;
u_int64_t flags;
u_int64_t addr;
u_int64_t offset;
u_int64_t size;
u_int64_t shlink;
u_int64_t info;
u_int64_t addralign;
u_int64_t entsize;
u_int64_t machine;
void *v;
int i;
if (sh == NULL) {
fprintf(out, "\nNo section headers\n");
return;
}
machine = elf_get_quarter(e, e, E_MACHINE);
shentsize = elf_get_quarter(e, e, E_SHENTSIZE);
shnum = elf_get_shnum(e, sh);
fprintf(out, "\nsection header:\n");
for (i = 0; (u_int64_t)i < shnum; i++) {
v = (char *)sh + i * shentsize;
name = elf_get_word(e, v, SH_NAME);
type = elf_get_word(e, v, SH_TYPE);
flags = elf_get_word(e, v, SH_FLAGS);
addr = elf_get_addr(e, v, SH_ADDR);
offset = elf_get_off(e, v, SH_OFFSET);
size = elf_get_size(e, v, SH_SIZE);
shlink = elf_get_word(e, v, SH_LINK);
info = elf_get_word(e, v, SH_INFO);
addralign = elf_get_size(e, v, SH_ADDRALIGN);
entsize = elf_get_size(e, v, SH_ENTSIZE);
fprintf(out, "\n");
fprintf(out, "entry: %d\n", i);
fprintf(out, "\tsh_name: %s\n", shstrtab + name);
fprintf(out, "\tsh_type: %s\n", sh_types(machine, type));
fprintf(out, "\tsh_flags: %s\n", sh_flags[flags & 0x7]);
fprintf(out, "\tsh_addr: %#jx\n", addr);
fprintf(out, "\tsh_offset: %jd\n", (intmax_t)offset);
fprintf(out, "\tsh_size: %jd\n", (intmax_t)size);
fprintf(out, "\tsh_link: %jd\n", (intmax_t)shlink);
fprintf(out, "\tsh_info: %jd\n", (intmax_t)info);
fprintf(out, "\tsh_addralign: %jd\n", (intmax_t)addralign);
fprintf(out, "\tsh_entsize: %jd\n", (intmax_t)entsize);
}
}
static void
elf_print_symtab(Elf32_Ehdr *e, void *sh, char *str)
{
u_int64_t machine;
u_int64_t offset;
u_int64_t entsize;
u_int64_t size;
u_int64_t name;
u_int64_t value;
u_int64_t info;
u_int64_t shndx;
void *st;
int len;
int i;
machine = elf_get_quarter(e, e, E_MACHINE);
offset = elf_get_off(e, sh, SH_OFFSET);
entsize = elf_get_size(e, sh, SH_ENTSIZE);
size = elf_get_size(e, sh, SH_SIZE);
name = elf_get_word(e, sh, SH_NAME);
len = size / entsize;
fprintf(out, "\nsymbol table (%s):\n", shstrtab + name);
for (i = 0; i < len; i++) {
st = (char *)e + offset + i * entsize;
name = elf_get_word(e, st, ST_NAME);
value = elf_get_addr(e, st, ST_VALUE);
size = elf_get_size(e, st, ST_SIZE);
info = elf_get_byte(e, st, ST_INFO);
shndx = elf_get_quarter(e, st, ST_SHNDX);
fprintf(out, "\n");
fprintf(out, "entry: %d\n", i);
fprintf(out, "\tst_name: %s\n", str + name);
fprintf(out, "\tst_value: %#jx\n", value);
fprintf(out, "\tst_size: %jd\n", (intmax_t)size);
fprintf(out, "\tst_info: %s %s\n",
st_type(machine, ELF32_ST_TYPE(info)),
st_bindings[ELF32_ST_BIND(info)]);
fprintf(out, "\tst_shndx: %jd\n", (intmax_t)shndx);
}
}
static void
elf_print_dynamic(Elf32_Ehdr *e, void *sh)
{
u_int64_t offset;
u_int64_t entsize;
u_int64_t size;
int64_t tag;
u_int64_t ptr;
u_int64_t val;
void *d;
int i;
offset = elf_get_off(e, sh, SH_OFFSET);
entsize = elf_get_size(e, sh, SH_ENTSIZE);
size = elf_get_size(e, sh, SH_SIZE);
fprintf(out, "\ndynamic:\n");
for (i = 0; (u_int64_t)i < size / entsize; i++) {
d = (char *)e + offset + i * entsize;
tag = elf_get_size(e, d, D_TAG);
ptr = elf_get_size(e, d, D_PTR);
val = elf_get_addr(e, d, D_VAL);
fprintf(out, "\n");
fprintf(out, "entry: %d\n", i);
fprintf(out, "\td_tag: %s\n", d_tags(tag));
switch (tag) {
case DT_NEEDED:
case DT_SONAME:
case DT_RPATH:
fprintf(out, "\td_val: %s\n", dynstr + val);
break;
case DT_PLTRELSZ:
case DT_RELA:
case DT_RELASZ:
case DT_RELAENT:
case DT_STRSZ:
case DT_SYMENT:
case DT_RELSZ:
case DT_RELENT:
case DT_PLTREL:
fprintf(out, "\td_val: %jd\n", (intmax_t)val);
break;
case DT_PLTGOT:
case DT_HASH:
case DT_STRTAB:
case DT_SYMTAB:
case DT_INIT:
case DT_FINI:
case DT_REL:
case DT_JMPREL:
fprintf(out, "\td_ptr: %#jx\n", ptr);
break;
case DT_NULL:
case DT_SYMBOLIC:
case DT_DEBUG:
case DT_TEXTREL:
break;
}
}
}
static void
elf_print_rela(Elf32_Ehdr *e, void *sh)
{
u_int64_t offset;
u_int64_t entsize;
u_int64_t size;
u_int64_t name;
u_int64_t info;
int64_t addend;
void *ra;
void *v;
int i;
offset = elf_get_off(e, sh, SH_OFFSET);
entsize = elf_get_size(e, sh, SH_ENTSIZE);
size = elf_get_size(e, sh, SH_SIZE);
name = elf_get_word(e, sh, SH_NAME);
v = (char *)e + offset;
fprintf(out, "\nrelocation with addend (%s):\n", shstrtab + name);
for (i = 0; (u_int64_t)i < size / entsize; i++) {
ra = (char *)v + i * entsize;
offset = elf_get_addr(e, ra, RA_OFFSET);
info = elf_get_word(e, ra, RA_INFO);
addend = elf_get_off(e, ra, RA_ADDEND);
fprintf(out, "\n");
fprintf(out, "entry: %d\n", i);
fprintf(out, "\tr_offset: %#jx\n", offset);
fprintf(out, "\tr_info: %jd\n", (intmax_t)info);
fprintf(out, "\tr_addend: %jd\n", (intmax_t)addend);
}
}
static void
elf_print_rel(Elf32_Ehdr *e, void *sh)
{
u_int64_t offset;
u_int64_t entsize;
u_int64_t size;
u_int64_t name;
u_int64_t info;
void *r;
void *v;
int i;
offset = elf_get_off(e, sh, SH_OFFSET);
entsize = elf_get_size(e, sh, SH_ENTSIZE);
size = elf_get_size(e, sh, SH_SIZE);
name = elf_get_word(e, sh, SH_NAME);
v = (char *)e + offset;
fprintf(out, "\nrelocation (%s):\n", shstrtab + name);
for (i = 0; (u_int64_t)i < size / entsize; i++) {
r = (char *)v + i * entsize;
offset = elf_get_addr(e, r, R_OFFSET);
info = elf_get_word(e, r, R_INFO);
fprintf(out, "\n");
fprintf(out, "entry: %d\n", i);
fprintf(out, "\tr_offset: %#jx\n", offset);
fprintf(out, "\tr_info: %jd\n", (intmax_t)info);
}
}
static void
elf_print_interp(Elf32_Ehdr *e, void *p)
{
u_int64_t offset;
char *s;
offset = elf_get_off(e, p, P_OFFSET);
s = (char *)e + offset;
fprintf(out, "\ninterp:\n");
fprintf(out, "\t%s\n", s);
}
static void
elf_print_got(Elf32_Ehdr *e, void *sh)
{
u_int64_t offset;
u_int64_t addralign;
u_int64_t size;
u_int64_t addr;
void *v;
int i;
offset = elf_get_off(e, sh, SH_OFFSET);
addralign = elf_get_size(e, sh, SH_ADDRALIGN);
size = elf_get_size(e, sh, SH_SIZE);
v = (char *)e + offset;
fprintf(out, "\nglobal offset table:\n");
for (i = 0; (u_int64_t)i < size / addralign; i++) {
addr = elf_get_addr(e, (char *)v + i * addralign, 0);
fprintf(out, "\n");
fprintf(out, "entry: %d\n", i);
fprintf(out, "\t%#jx\n", addr);
}
}
static void
elf_print_hash(Elf32_Ehdr *e __unused, void *sh __unused)
{
}
static void
elf_print_note(Elf32_Ehdr *e, void *sh)
{
u_int64_t offset;
u_int64_t size;
u_int64_t name;
u_int32_t namesz;
u_int32_t descsz;
u_int32_t desc;
char *n, *s;
offset = elf_get_off(e, sh, SH_OFFSET);
size = elf_get_size(e, sh, SH_SIZE);
name = elf_get_word(e, sh, SH_NAME);
n = (char *)e + offset;
fprintf(out, "\nnote (%s):\n", shstrtab + name);
while (n < ((char *)e + offset + size)) {
namesz = elf_get_word(e, n, N_NAMESZ);
descsz = elf_get_word(e, n, N_DESCSZ);
s = n + sizeof(Elf_Note);
desc = elf_get_word(e, n + sizeof(Elf_Note) + namesz, 0);
fprintf(out, "\t%s %d\n", s, desc);
n += sizeof(Elf_Note) + namesz + descsz;
}
}
static u_int64_t
elf_get_byte(Elf32_Ehdr *e, void *base, elf_member_t member)
{
u_int64_t val;
val = 0;
switch (e->e_ident[EI_CLASS]) {
case ELFCLASS32:
val = ((uint8_t *)base)[elf32_offsets[member]];
break;
case ELFCLASS64:
val = ((uint8_t *)base)[elf64_offsets[member]];
break;
case ELFCLASSNONE:
errx(1, "invalid class");
}
return val;
}
static u_int64_t
elf_get_quarter(Elf32_Ehdr *e, void *base, elf_member_t member)
{
u_int64_t val;
val = 0;
switch (e->e_ident[EI_CLASS]) {
case ELFCLASS32:
base = (char *)base + elf32_offsets[member];
switch (e->e_ident[EI_DATA]) {
case ELFDATA2MSB:
val = be16dec(base);
break;
case ELFDATA2LSB:
val = le16dec(base);
break;
case ELFDATANONE:
errx(1, "invalid data format");
}
break;
case ELFCLASS64:
base = (char *)base + elf64_offsets[member];
switch (e->e_ident[EI_DATA]) {
case ELFDATA2MSB:
val = be16dec(base);
break;
case ELFDATA2LSB:
val = le16dec(base);
break;
case ELFDATANONE:
errx(1, "invalid data format");
}
break;
case ELFCLASSNONE:
errx(1, "invalid class");
}
return val;
}
#if 0
static u_int64_t
elf_get_half(Elf32_Ehdr *e, void *base, elf_member_t member)
{
u_int64_t val;
val = 0;
switch (e->e_ident[EI_CLASS]) {
case ELFCLASS32:
base = (char *)base + elf32_offsets[member];
switch (e->e_ident[EI_DATA]) {
case ELFDATA2MSB:
val = be16dec(base);
break;
case ELFDATA2LSB:
val = le16dec(base);
break;
case ELFDATANONE:
errx(1, "invalid data format");
}
break;
case ELFCLASS64:
base = (char *)base + elf64_offsets[member];
switch (e->e_ident[EI_DATA]) {
case ELFDATA2MSB:
val = be32dec(base);
break;
case ELFDATA2LSB:
val = le32dec(base);
break;
case ELFDATANONE:
errx(1, "invalid data format");
}
break;
case ELFCLASSNONE:
errx(1, "invalid class");
}
return val;
}
#endif
static u_int64_t
elf_get_word(Elf32_Ehdr *e, void *base, elf_member_t member)
{
u_int64_t val;
val = 0;
switch (e->e_ident[EI_CLASS]) {
case ELFCLASS32:
base = (char *)base + elf32_offsets[member];
switch (e->e_ident[EI_DATA]) {
case ELFDATA2MSB:
val = be32dec(base);
break;
case ELFDATA2LSB:
val = le32dec(base);
break;
case ELFDATANONE:
errx(1, "invalid data format");
}
break;
case ELFCLASS64:
base = (char *)base + elf64_offsets[member];
switch (e->e_ident[EI_DATA]) {
case ELFDATA2MSB:
val = be32dec(base);
break;
case ELFDATA2LSB:
val = le32dec(base);
break;
case ELFDATANONE:
errx(1, "invalid data format");
}
break;
case ELFCLASSNONE:
errx(1, "invalid class");
}
return val;
}
static u_int64_t
elf_get_quad(Elf32_Ehdr *e, void *base, elf_member_t member)
{
u_int64_t val;
val = 0;
switch (e->e_ident[EI_CLASS]) {
case ELFCLASS32:
base = (char *)base + elf32_offsets[member];
switch (e->e_ident[EI_DATA]) {
case ELFDATA2MSB:
val = be32dec(base);
break;
case ELFDATA2LSB:
val = le32dec(base);
break;
case ELFDATANONE:
errx(1, "invalid data format");
}
break;
case ELFCLASS64:
base = (char *)base + elf64_offsets[member];
switch (e->e_ident[EI_DATA]) {
case ELFDATA2MSB:
val = be64dec(base);
break;
case ELFDATA2LSB:
val = le64dec(base);
break;
case ELFDATANONE:
errx(1, "invalid data format");
}
break;
case ELFCLASSNONE:
errx(1, "invalid class");
}
return val;
}
static void
usage(void)
{
fprintf(stderr,
"usage: elfdump -a | -E | -cdeGhinprs [-w file] file\n");
exit(1);
}
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