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63fb40b32a
* po/sk.po: Update from translation team. 2002-05-28 Andreas Schwab <schwab@suse.de> * sysdeps/generic/readelflib.c (process_elf_file): Give correct message when finding object of wrong class. 2002-05-28 Jakub Jelinek <jakub@redhat.com> * sysdeps/wordsize-32/divdi3.c (__moddi3): Fix pasto. Patch by <radu@netsoft.ro>. 2002-05-30 Ulrich Drepper <drepper@redhat.com>
222 lines
6.1 KiB
C
222 lines
6.1 KiB
C
/* Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Andreas Jaeger <aj@suse.de>, 1999 and
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Jakub Jelinek <jakub@redhat.com>, 1999.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* This code is a heavily simplified version of the readelf program
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that's part of the current binutils development version. For architectures
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which need to handle both 32bit and 64bit ELF libraries, this file is
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included twice for each arch size. */
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/* check_ptr checks that a pointer is in the mmaped file and doesn't
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point outside it. */
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#undef check_ptr
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#define check_ptr(ptr) \
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do \
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{ \
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if ((void *)(ptr) < file_contents \
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|| (void *)(ptr) > (file_contents+file_length)) \
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{ \
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error (0, 0, _("file %s is truncated\n"), file_name); \
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return 1; \
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} \
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} \
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while (0);
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/* Returns 0 if everything is ok, != 0 in case of error. */
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int
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process_elf_file (const char *file_name, const char *lib, int *flag,
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unsigned int *osversion, char **soname, void *file_contents,
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size_t file_length)
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{
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int i;
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unsigned int j;
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int loadaddr;
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unsigned int dynamic_addr;
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size_t dynamic_size;
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char *program_interpreter;
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ElfW(Ehdr) *elf_header;
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ElfW(Phdr) *elf_pheader, *segment;
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ElfW(Dyn) *dynamic_segment, *dyn_entry;
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char *dynamic_strings;
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elf_header = (ElfW(Ehdr) *) file_contents;
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*osversion = 0;
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if (elf_header->e_ident [EI_CLASS] != ElfW (CLASS))
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{
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if (opt_verbose)
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{
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if (elf_header->e_ident [EI_CLASS] == ELFCLASS32)
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error (0, 0, _("%s is a 32 bit ELF file.\n"), file_name);
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else if (elf_header->e_ident [EI_CLASS] == ELFCLASS64)
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error (0, 0, _("%s is a 64 bit ELF file.\n"), file_name);
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else
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error (0, 0, _("Unknown ELFCLASS in file %s.\n"), file_name);
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}
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return 1;
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}
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if (elf_header->e_type != ET_DYN)
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{
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error (0, 0, _("%s is not a shared object file (Type: %d).\n"), file_name,
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elf_header->e_type);
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return 1;
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}
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/* Get information from elf program header. */
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elf_pheader = (ElfW(Phdr) *) (elf_header->e_phoff + file_contents);
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check_ptr (elf_pheader);
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/* The library is an elf library, now search for soname and
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libc5/libc6. */
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*flag = FLAG_ELF;
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loadaddr = -1;
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dynamic_addr = 0;
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dynamic_size = 0;
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program_interpreter = NULL;
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for (i = 0, segment = elf_pheader;
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i < elf_header->e_phnum; i++, segment++)
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{
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check_ptr (segment);
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switch (segment->p_type)
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{
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case PT_LOAD:
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if (loadaddr == -1)
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loadaddr = (segment->p_vaddr & 0xfffff000)
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- (segment->p_offset & 0xfffff000);
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break;
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case PT_DYNAMIC:
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if (dynamic_addr)
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error (0, 0, _("more than one dynamic segment\n"));
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dynamic_addr = segment->p_offset;
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dynamic_size = segment->p_filesz;
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break;
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case PT_INTERP:
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program_interpreter = (char *) (file_contents + segment->p_offset);
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check_ptr (program_interpreter);
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/* Check if this is enough to classify the binary. */
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for (j = 0; j < sizeof (interpreters) / sizeof (interpreters [0]);
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++j)
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if (strcmp (program_interpreter, interpreters[j].soname) == 0)
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{
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*flag = interpreters[j].flag;
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break;
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}
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break;
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case PT_NOTE:
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if (!*osversion && segment->p_filesz == 32 && segment->p_align >= 4)
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{
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ElfW(Word) *abi_note = (ElfW(Word) *) (file_contents
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+ segment->p_offset);
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if (abi_note [0] == 4 && abi_note [1] == 16 && abi_note [2] == 1
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&& memcmp (abi_note + 3, "GNU", 4) == 0)
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*osversion = (abi_note [4] << 24) |
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((abi_note [5] & 0xff) << 16) |
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((abi_note [6] & 0xff) << 8) |
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(abi_note [7] & 0xff);
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}
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break;
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default:
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break;
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}
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}
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if (loadaddr == -1)
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{
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/* Very strange. */
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loadaddr = 0;
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}
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/* Now we can read the dynamic sections. */
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if (dynamic_size == 0)
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return 1;
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dynamic_segment = (ElfW(Dyn) *) (file_contents + dynamic_addr);
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check_ptr (dynamic_segment);
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/* Find the string table. */
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dynamic_strings = NULL;
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for (dyn_entry = dynamic_segment; dyn_entry->d_tag != DT_NULL;
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++dyn_entry)
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{
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check_ptr (dyn_entry);
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if (dyn_entry->d_tag == DT_STRTAB)
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{
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dynamic_strings = (char *) (file_contents + dyn_entry->d_un.d_val - loadaddr);
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check_ptr (dynamic_strings);
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break;
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}
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}
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if (dynamic_strings == NULL)
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return 1;
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/* Now read the DT_NEEDED and DT_SONAME entries. */
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for (dyn_entry = dynamic_segment; dyn_entry->d_tag != DT_NULL;
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++dyn_entry)
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{
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if (dyn_entry->d_tag == DT_NEEDED || dyn_entry->d_tag == DT_SONAME)
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{
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char *name = dynamic_strings + dyn_entry->d_un.d_val;
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check_ptr (name);
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if (dyn_entry->d_tag == DT_NEEDED)
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{
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if (*flag == FLAG_ELF)
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{
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/* Check if this is enough to classify the binary. */
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for (j = 0;
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j < sizeof (known_libs) / sizeof (known_libs [0]);
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++j)
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if (strcmp (name, known_libs [j].soname) == 0)
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{
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*flag = known_libs [j].flag;
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break;
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}
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}
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}
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else if (dyn_entry->d_tag == DT_SONAME)
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*soname = xstrdup (name);
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/* Do we have everything we need? */
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if (*soname && *flag != FLAG_ELF)
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return 0;
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}
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}
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/* We reach this point only if the file doesn't contain a DT_SONAME
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or if we can't classify the library. If it doesn't have a
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soname, return the name of the library. */
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if (*soname == NULL)
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*soname = xstrdup (lib);
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return 0;
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}
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