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freebsd-dev/usr.bin/elfdump/elfdump.c
Pedro F. Giffuni 1de7b4b805 various: general adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.
2017-11-27 15:37:16 +00:00

1260 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 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, "acdeiGhnprsw:")) != -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_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 (cap_rights_limit(fileno(out), &rights) < 0 && errno != ENOSYS)
err(1, "unable to limit rights for %s", optarg);
break;
case '?':
default:
usage();
}
ac -= optind;
av += optind;
if (ac == 0 || flags == 0)
usage();
if ((fd = open(*av, O_RDONLY)) < 0 ||
fstat(fd, &sb) < 0)
err(1, "%s", *av);
cap_rights_init(&rights, CAP_MMAP_R);
if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS)
err(1, "unable to limit rights for %s", *av);
cap_rights_init(&rights);
if ((cap_rights_limit(STDIN_FILENO, &rights) < 0 && errno != ENOSYS) ||
caph_limit_stdout() < 0 || caph_limit_stderr() < 0) {
err(1, "unable to limit rights for stdio");
}
if (cap_enter() < 0 && errno != ENOSYS)
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))
errx(1, "not an elf file");
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.ABI-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 | -cdeGhinprs [-w file] file\n");
exit(1);
}
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