|
Packit |
6c4009 |
/* Copyright (C) 1999-2018 Free Software Foundation, Inc.
|
|
Packit |
6c4009 |
This file is part of the GNU C Library.
|
|
Packit |
6c4009 |
Contributed by Andreas Jaeger <aj@suse.de>, 1999 and
|
|
Packit |
6c4009 |
Jakub Jelinek <jakub@redhat.com>, 1999.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
The GNU C Library is free software; you can redistribute it and/or
|
|
Packit |
6c4009 |
modify it under the terms of the GNU Lesser General Public
|
|
Packit |
6c4009 |
License as published by the Free Software Foundation; either
|
|
Packit |
6c4009 |
version 2.1 of the License, or (at your option) any later version.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
The GNU C Library is distributed in the hope that it will be useful,
|
|
Packit |
6c4009 |
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
Packit |
6c4009 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Packit |
6c4009 |
Lesser General Public License for more details.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
You should have received a copy of the GNU Lesser General Public
|
|
Packit |
6c4009 |
License along with the GNU C Library; if not, see
|
|
Packit |
6c4009 |
<http://www.gnu.org/licenses/>. */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* This code is a heavily simplified version of the readelf program
|
|
Packit |
6c4009 |
that's part of the current binutils development version. For architectures
|
|
Packit |
6c4009 |
which need to handle both 32bit and 64bit ELF libraries, this file is
|
|
Packit |
6c4009 |
included twice for each arch size. */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* check_ptr checks that a pointer is in the mmaped file and doesn't
|
|
Packit |
6c4009 |
point outside it. */
|
|
Packit |
6c4009 |
#undef check_ptr
|
|
Packit |
6c4009 |
#define check_ptr(ptr) \
|
|
Packit |
6c4009 |
do \
|
|
Packit |
6c4009 |
{ \
|
|
Packit |
6c4009 |
if ((void *)(ptr) < file_contents \
|
|
Packit |
6c4009 |
|| (void *)(ptr) > (file_contents+file_length)) \
|
|
Packit |
6c4009 |
{ \
|
|
Packit |
6c4009 |
error (0, 0, _("file %s is truncated\n"), file_name); \
|
|
Packit |
6c4009 |
return 1; \
|
|
Packit |
6c4009 |
} \
|
|
Packit |
6c4009 |
} \
|
|
Packit |
6c4009 |
while (0);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Returns 0 if everything is ok, != 0 in case of error. */
|
|
Packit |
6c4009 |
int
|
|
Packit |
6c4009 |
process_elf_file (const char *file_name, const char *lib, int *flag,
|
|
Packit |
6c4009 |
unsigned int *osversion, char **soname, void *file_contents,
|
|
Packit |
6c4009 |
size_t file_length)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
int i;
|
|
Packit |
6c4009 |
unsigned int j;
|
|
Packit |
6c4009 |
unsigned int dynamic_addr;
|
|
Packit |
6c4009 |
size_t dynamic_size;
|
|
Packit |
6c4009 |
char *program_interpreter;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
ElfW(Ehdr) *elf_header;
|
|
Packit |
6c4009 |
ElfW(Phdr) *elf_pheader, *segment;
|
|
Packit |
6c4009 |
ElfW(Dyn) *dynamic_segment, *dyn_entry;
|
|
Packit |
6c4009 |
char *dynamic_strings;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
elf_header = (ElfW(Ehdr) *) file_contents;
|
|
Packit |
6c4009 |
*osversion = 0;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (elf_header->e_ident [EI_CLASS] != ElfW (CLASS))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
if (opt_verbose)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
if (elf_header->e_ident [EI_CLASS] == ELFCLASS32)
|
|
Packit |
6c4009 |
error (0, 0, _("%s is a 32 bit ELF file.\n"), file_name);
|
|
Packit |
6c4009 |
else if (elf_header->e_ident [EI_CLASS] == ELFCLASS64)
|
|
Packit |
6c4009 |
error (0, 0, _("%s is a 64 bit ELF file.\n"), file_name);
|
|
Packit |
6c4009 |
else
|
|
Packit |
6c4009 |
error (0, 0, _("Unknown ELFCLASS in file %s.\n"), file_name);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
return 1;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (elf_header->e_type != ET_DYN)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
error (0, 0, _("%s is not a shared object file (Type: %d).\n"), file_name,
|
|
Packit |
6c4009 |
elf_header->e_type);
|
|
Packit |
6c4009 |
return 1;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Get information from elf program header. */
|
|
Packit |
6c4009 |
elf_pheader = (ElfW(Phdr) *) (elf_header->e_phoff + file_contents);
|
|
Packit |
6c4009 |
check_ptr (elf_pheader);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* The library is an elf library, now search for soname and
|
|
Packit |
6c4009 |
libc5/libc6. */
|
|
Packit |
6c4009 |
*flag = FLAG_ELF;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
dynamic_addr = 0;
|
|
Packit |
6c4009 |
dynamic_size = 0;
|
|
Packit |
6c4009 |
program_interpreter = NULL;
|
|
Packit |
6c4009 |
for (i = 0, segment = elf_pheader;
|
|
Packit |
6c4009 |
i < elf_header->e_phnum; i++, segment++)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
check_ptr (segment);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
switch (segment->p_type)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
case PT_DYNAMIC:
|
|
Packit |
6c4009 |
if (dynamic_addr)
|
|
Packit |
6c4009 |
error (0, 0, _("more than one dynamic segment\n"));
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
dynamic_addr = segment->p_offset;
|
|
Packit |
6c4009 |
dynamic_size = segment->p_filesz;
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
case PT_INTERP:
|
|
Packit |
6c4009 |
program_interpreter = (char *) (file_contents + segment->p_offset);
|
|
Packit |
6c4009 |
check_ptr (program_interpreter);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Check if this is enough to classify the binary. */
|
|
Packit |
6c4009 |
for (j = 0; j < sizeof (interpreters) / sizeof (interpreters [0]);
|
|
Packit |
6c4009 |
++j)
|
|
Packit |
6c4009 |
if (strcmp (program_interpreter, interpreters[j].soname) == 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
*flag = interpreters[j].flag;
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
case PT_NOTE:
|
|
Packit |
6c4009 |
if (!*osversion && segment->p_filesz >= 32 && segment->p_align >= 4)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
ElfW(Word) *abi_note = (ElfW(Word) *) (file_contents
|
|
Packit |
6c4009 |
+ segment->p_offset);
|
|
Packit |
6c4009 |
ElfW(Addr) size = segment->p_filesz;
|
|
Packit |
6c4009 |
/* NB: Some PT_NOTE segment may have alignment value of 0
|
|
Packit |
6c4009 |
or 1. gABI specifies that PT_NOTE segments should be
|
|
Packit |
6c4009 |
aligned to 4 bytes in 32-bit objects and to 8 bytes in
|
|
Packit |
6c4009 |
64-bit objects. As a Linux extension, we also support
|
|
Packit |
6c4009 |
4 byte alignment in 64-bit objects. If p_align is less
|
|
Packit |
6c4009 |
than 4, we treate alignment as 4 bytes since some note
|
|
Packit |
6c4009 |
segments have 0 or 1 byte alignment. */
|
|
Packit |
6c4009 |
ElfW(Addr) align = segment->p_align;
|
|
Packit |
6c4009 |
if (align < 4)
|
|
Packit |
6c4009 |
align = 4;
|
|
Packit |
6c4009 |
else if (align != 4 && align != 8)
|
|
Packit |
6c4009 |
continue;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
while (abi_note [0] != 4 || abi_note [1] != 16
|
|
Packit |
6c4009 |
|| abi_note [2] != 1
|
|
Packit |
6c4009 |
|| memcmp (abi_note + 3, "GNU", 4) != 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
ElfW(Addr) note_size
|
|
Packit |
6c4009 |
= ELF_NOTE_NEXT_OFFSET (abi_note[0], abi_note[1],
|
|
Packit |
6c4009 |
align);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (size - 32 < note_size || note_size == 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
size = 0;
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
size -= note_size;
|
|
Packit |
6c4009 |
abi_note = (void *) abi_note + note_size;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (size == 0)
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
*osversion = (abi_note [4] << 24) |
|
|
Packit |
6c4009 |
((abi_note [5] & 0xff) << 16) |
|
|
Packit |
6c4009 |
((abi_note [6] & 0xff) << 8) |
|
|
Packit |
6c4009 |
(abi_note [7] & 0xff);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
default:
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Now we can read the dynamic sections. */
|
|
Packit |
6c4009 |
if (dynamic_size == 0)
|
|
Packit |
6c4009 |
return 1;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
dynamic_segment = (ElfW(Dyn) *) (file_contents + dynamic_addr);
|
|
Packit |
6c4009 |
check_ptr (dynamic_segment);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Find the string table. */
|
|
Packit |
6c4009 |
dynamic_strings = NULL;
|
|
Packit |
6c4009 |
for (dyn_entry = dynamic_segment; dyn_entry->d_tag != DT_NULL;
|
|
Packit |
6c4009 |
++dyn_entry)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
check_ptr (dyn_entry);
|
|
Packit |
6c4009 |
if (dyn_entry->d_tag == DT_STRTAB)
|
|
Packit |
6c4009 |
{
|
|
Packit Service |
727b9c |
/* Find the file offset of the segment containing the dynamic
|
|
Packit Service |
727b9c |
string table. */
|
|
Packit Service |
727b9c |
ElfW(Off) loadoff = -1;
|
|
Packit Service |
727b9c |
for (i = 0, segment = elf_pheader;
|
|
Packit Service |
727b9c |
i < elf_header->e_phnum; i++, segment++)
|
|
Packit Service |
727b9c |
{
|
|
Packit Service |
727b9c |
if (segment->p_type == PT_LOAD
|
|
Packit Service |
727b9c |
&& dyn_entry->d_un.d_val >= segment->p_vaddr
|
|
Packit Service |
727b9c |
&& (dyn_entry->d_un.d_val - segment->p_vaddr
|
|
Packit Service |
727b9c |
< segment->p_filesz))
|
|
Packit Service |
727b9c |
{
|
|
Packit Service |
727b9c |
loadoff = segment->p_vaddr - segment->p_offset;
|
|
Packit Service |
727b9c |
break;
|
|
Packit Service |
727b9c |
}
|
|
Packit Service |
727b9c |
}
|
|
Packit Service |
727b9c |
if (loadoff == (ElfW(Off)) -1)
|
|
Packit Service |
727b9c |
{
|
|
Packit Service |
727b9c |
/* Very strange. */
|
|
Packit Service |
727b9c |
loadoff = 0;
|
|
Packit Service |
727b9c |
}
|
|
Packit Service |
727b9c |
|
|
Packit Service |
727b9c |
dynamic_strings = (char *) (file_contents + dyn_entry->d_un.d_val
|
|
Packit Service |
727b9c |
- loadoff);
|
|
Packit |
6c4009 |
check_ptr (dynamic_strings);
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (dynamic_strings == NULL)
|
|
Packit |
6c4009 |
return 1;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Now read the DT_NEEDED and DT_SONAME entries. */
|
|
Packit |
6c4009 |
for (dyn_entry = dynamic_segment; dyn_entry->d_tag != DT_NULL;
|
|
Packit |
6c4009 |
++dyn_entry)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
if (dyn_entry->d_tag == DT_NEEDED || dyn_entry->d_tag == DT_SONAME)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
char *name = dynamic_strings + dyn_entry->d_un.d_val;
|
|
Packit |
6c4009 |
check_ptr (name);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (dyn_entry->d_tag == DT_NEEDED)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (*flag == FLAG_ELF)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* Check if this is enough to classify the binary. */
|
|
Packit |
6c4009 |
for (j = 0;
|
|
Packit |
6c4009 |
j < sizeof (known_libs) / sizeof (known_libs [0]);
|
|
Packit |
6c4009 |
++j)
|
|
Packit |
6c4009 |
if (strcmp (name, known_libs [j].soname) == 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
*flag = known_libs [j].flag;
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
else if (dyn_entry->d_tag == DT_SONAME)
|
|
Packit |
6c4009 |
*soname = xstrdup (name);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Do we have everything we need? */
|
|
Packit |
6c4009 |
if (*soname && *flag != FLAG_ELF)
|
|
Packit |
6c4009 |
return 0;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return 0;
|
|
Packit |
6c4009 |
}
|