More fixes for memory corruption when readelf processes corrupt files.
PR binutils/17531 (get_32bit_program_headers): Verify program header entry size before reading in the program headers. (get_64bit_program_headers): Likewise. (get_unwind_section_word): Do nothing if no section was provided. Fail if the offset is outside of the section. (print_dynamic_symbol): Catch out of range symbol indicies. (process_mips_specific): Likewise. (process_attributes): Make sure that there is enough space left in the section before attempting to read the length of the next attribute.
This commit is contained in:
Nick Clifton
parent
bb0d867169
commit
e0a31db1b1
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@ -11,6 +11,17 @@
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(process_dynamic_section): Change an assert to an error message.
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(process_symbol_table): Handle corrupt histograms.
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(get_32bit_program_headers): Verify program header entry size
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before reading in the program headers.
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(get_64bit_program_headers): Likewise.
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(get_unwind_section_word): Do nothing if no section was provided.
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Fail if the offset is outside of the section.
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(print_dynamic_symbol): Catch out of range symbol indicies.
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(process_mips_specific): Likewise.
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(process_attributes): Make sure that there is enough space left in
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the section before attempting to read the length of the next
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attribute.
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2014-11-03 Nick Clifton <nickc@redhat.com>
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PR binutils/17512
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@ -4104,21 +4104,31 @@ process_file_header (void)
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return 1;
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}
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static int
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static bfd_boolean
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get_32bit_program_headers (FILE * file, Elf_Internal_Phdr * pheaders)
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{
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Elf32_External_Phdr * phdrs;
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Elf32_External_Phdr * external;
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Elf_Internal_Phdr * internal;
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unsigned int i;
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unsigned int size = elf_header.e_phentsize;
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unsigned int num = elf_header.e_phnum;
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/* PR binutils/17531: Cope with unexpected section header sizes. */
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if (size == 0 || num == 0)
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return FALSE;
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if (size < sizeof * phdrs)
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{
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error (_("The e_phentsize field in the ELF header is less than the size of an ELF program header\n"));
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return FALSE;
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}
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if (size > sizeof * phdrs)
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warn (_("The e_phentsize field in the ELF header is larger than the size of an ELF program header\n"));
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phdrs = (Elf32_External_Phdr *) get_data (NULL, file, elf_header.e_phoff,
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elf_header.e_phentsize,
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elf_header.e_phnum,
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_("program headers"));
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if (!phdrs)
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return 0;
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size, num, _("program headers"));
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if (phdrs == NULL)
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return FALSE;
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for (i = 0, internal = pheaders, external = phdrs;
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i < elf_header.e_phnum;
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@ -4135,24 +4145,34 @@ get_32bit_program_headers (FILE * file, Elf_Internal_Phdr * pheaders)
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}
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free (phdrs);
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return 1;
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return TRUE;
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}
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static int
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static bfd_boolean
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get_64bit_program_headers (FILE * file, Elf_Internal_Phdr * pheaders)
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{
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Elf64_External_Phdr * phdrs;
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Elf64_External_Phdr * external;
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Elf_Internal_Phdr * internal;
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unsigned int i;
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unsigned int size = elf_header.e_phentsize;
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unsigned int num = elf_header.e_phnum;
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/* PR binutils/17531: Cope with unexpected section header sizes. */
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if (size == 0 || num == 0)
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return FALSE;
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if (size < sizeof * phdrs)
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{
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error (_("The e_phentsize field in the ELF header is less than the size of an ELF program header\n"));
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return FALSE;
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}
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if (size > sizeof * phdrs)
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warn (_("The e_phentsize field in the ELF header is larger than the size of an ELF program header\n"));
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phdrs = (Elf64_External_Phdr *) get_data (NULL, file, elf_header.e_phoff,
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elf_header.e_phentsize,
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elf_header.e_phnum,
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_("program headers"));
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size, num, _("program headers"));
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if (!phdrs)
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return 0;
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return FALSE;
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for (i = 0, internal = pheaders, external = phdrs;
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i < elf_header.e_phnum;
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@ -4169,8 +4189,7 @@ get_64bit_program_headers (FILE * file, Elf_Internal_Phdr * pheaders)
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}
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free (phdrs);
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return 1;
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return TRUE;
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}
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/* Returns 1 if the program headers were read into `program_headers'. */
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@ -6903,6 +6922,9 @@ get_unwind_section_word (struct arm_unw_aux_info * aux,
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unsigned int word;
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bfd_boolean wrapped;
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if (sec == NULL || arm_sec == NULL)
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return FALSE;
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addr->section = SHN_UNDEF;
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addr->offset = 0;
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@ -6958,6 +6980,10 @@ get_unwind_section_word (struct arm_unw_aux_info * aux,
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if (arm_sec->data == NULL)
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return FALSE;
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/* If the offset is invalid then fail. */
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if (word_offset > sec->sh_size - 4)
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return FALSE;
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/* Get the word at the required offset. */
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word = byte_get (arm_sec->data + word_offset, 4);
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@ -9585,7 +9611,7 @@ get_symbol_index_type (unsigned int type)
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else if (type >= SHN_LORESERVE)
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sprintf (buff, "RSV[0x%04x]", type & 0xffff);
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else if (type >= elf_header.e_shnum)
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sprintf (buff, "bad section index[%3d]", type);
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sprintf (buff, _("bad section index[%3d]"), type);
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else
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sprintf (buff, "%3d", type);
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break;
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@ -9637,12 +9663,18 @@ print_dynamic_symbol (bfd_vma si, unsigned long hn)
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Elf_Internal_Sym * psym;
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int n;
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psym = dynamic_symbols + si;
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n = print_vma (si, DEC_5);
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if (n < 5)
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fputs (&" "[n], stdout);
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printf (" %3lu: ", hn);
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if (dynamic_symbols == NULL || si >= num_dynamic_syms)
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{
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printf (_("<No info available>\n"));
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return;
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}
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psym = dynamic_symbols + si;
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print_vma (psym->st_value, LONG_HEX);
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putchar (' ');
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print_vma (psym->st_size, DEC_5);
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@ -10313,6 +10345,7 @@ process_syminfo (FILE * file ATTRIBUTE_UNUSED)
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unsigned short int flags = dynamic_syminfo[i].si_flags;
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printf ("%4d: ", i);
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assert (i < num_dynamic_syms);
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if (VALID_DYNAMIC_NAME (dynamic_symbols[i].st_name))
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print_symbol (30, GET_DYNAMIC_NAME (dynamic_symbols[i].st_name));
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else
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@ -12426,6 +12459,7 @@ display_raw_attribute (unsigned char * p, unsigned char * end)
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unsigned long addr = 0;
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size_t bytes = end - p;
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assert (end > p);
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while (bytes)
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{
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int j;
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@ -12577,6 +12611,11 @@ process_attributes (FILE * file,
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bfd_boolean public_section;
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bfd_boolean gnu_section;
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if (len <= 4)
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{
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error (_("Tag section ends prematurely\n"));
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break;
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}
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section_len = byte_get (p, 4);
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p += 4;
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@ -12611,12 +12650,22 @@ process_attributes (FILE * file,
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p += namelen;
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section_len -= namelen;
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while (section_len > 0)
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{
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int tag = *(p++);
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int tag;
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int val;
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bfd_vma size;
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/* PR binutils/17531: Safe handling of corrupt files. */
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if (section_len < 6)
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{
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error (_("Unused bytes at end of section\n"));
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section_len = 0;
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break;
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}
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tag = *(p++);
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size = byte_get (p, 4);
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if (size > section_len)
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{
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@ -12624,6 +12673,14 @@ process_attributes (FILE * file,
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(unsigned) size, (unsigned) section_len);
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size = section_len;
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}
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/* PR binutils/17531: Safe handling of corrupt files. */
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if (size < 6)
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{
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error (_("Bad subsection length (%u < 6)\n"),
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(unsigned) size);
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section_len = 0;
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break;
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}
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section_len -= size;
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end = p + size - 1;
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@ -13349,15 +13406,22 @@ process_mips_specific (FILE * file)
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for (cnt = 0; cnt < conflictsno; ++cnt)
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{
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Elf_Internal_Sym * psym = & dynamic_symbols[iconf[cnt]];
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printf ("%5lu: %8lu ", (unsigned long) cnt, iconf[cnt]);
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print_vma (psym->st_value, FULL_HEX);
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putchar (' ');
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if (VALID_DYNAMIC_NAME (psym->st_name))
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print_symbol (25, GET_DYNAMIC_NAME (psym->st_name));
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if (iconf[cnt] >= num_dynamic_syms)
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printf (_("<corrupt symbol index>"));
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else
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printf (_("<corrupt: %14ld>"), psym->st_name);
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{
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Elf_Internal_Sym * psym;
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psym = & dynamic_symbols[iconf[cnt]];
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print_vma (psym->st_value, FULL_HEX);
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putchar (' ');
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if (VALID_DYNAMIC_NAME (psym->st_name))
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print_symbol (25, GET_DYNAMIC_NAME (psym->st_name));
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else
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printf (_("<corrupt: %14ld>"), psym->st_name);
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}
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putchar ('\n');
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}
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@ -13432,21 +13496,31 @@ process_mips_specific (FILE * file)
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_("Ndx"), _("Name"));
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sym_width = (is_32bit_elf ? 80 : 160) - 28 - addr_size * 6 - 1;
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for (i = gotsym; i < symtabno; i++)
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{
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Elf_Internal_Sym * psym;
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psym = dynamic_symbols + i;
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ent = print_mips_got_entry (data, pltgot, ent);
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printf (" ");
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print_vma (psym->st_value, LONG_HEX);
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printf (" %-7s %3s ",
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get_symbol_type (ELF_ST_TYPE (psym->st_info)),
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get_symbol_index_type (psym->st_shndx));
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if (VALID_DYNAMIC_NAME (psym->st_name))
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print_symbol (sym_width, GET_DYNAMIC_NAME (psym->st_name));
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if (dynamic_symbols == NULL)
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printf (_("<no dynamic symbols>"));
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else if (i < num_dynamic_syms)
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{
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Elf_Internal_Sym * psym = dynamic_symbols + i;
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print_vma (psym->st_value, LONG_HEX);
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printf (" %-7s %3s ",
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get_symbol_type (ELF_ST_TYPE (psym->st_info)),
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get_symbol_index_type (psym->st_shndx));
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if (VALID_DYNAMIC_NAME (psym->st_name))
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print_symbol (sym_width, GET_DYNAMIC_NAME (psym->st_name));
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else
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printf (_("<corrupt: %14ld>"), psym->st_name);
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}
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else
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printf (_("<corrupt: %14ld>"), psym->st_name);
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printf (_("<symbol index %lu exceeds number of dynamic symbols>"), i);
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printf ("\n");
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}
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printf ("\n");
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@ -13505,19 +13579,26 @@ process_mips_specific (FILE * file)
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sym_width = (is_32bit_elf ? 80 : 160) - 17 - addr_size * 6 - 1;
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for (i = 0; i < count; i++)
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{
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Elf_Internal_Sym * psym;
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unsigned long index = get_reloc_symindex (rels[i].r_info);
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psym = dynamic_symbols + get_reloc_symindex (rels[i].r_info);
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ent = print_mips_pltgot_entry (data, mips_pltgot, ent);
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printf (" ");
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print_vma (psym->st_value, LONG_HEX);
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printf (" %-7s %3s ",
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get_symbol_type (ELF_ST_TYPE (psym->st_info)),
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get_symbol_index_type (psym->st_shndx));
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if (VALID_DYNAMIC_NAME (psym->st_name))
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print_symbol (sym_width, GET_DYNAMIC_NAME (psym->st_name));
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if (index >= num_dynamic_syms)
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printf (_("<corrupt symbol index: %lu>"), index);
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else
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printf (_("<corrupt: %14ld>"), psym->st_name);
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{
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Elf_Internal_Sym * psym = dynamic_symbols + index;
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print_vma (psym->st_value, LONG_HEX);
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printf (" %-7s %3s ",
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get_symbol_type (ELF_ST_TYPE (psym->st_info)),
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get_symbol_index_type (psym->st_shndx));
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if (VALID_DYNAMIC_NAME (psym->st_name))
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print_symbol (sym_width, GET_DYNAMIC_NAME (psym->st_name));
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else
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printf (_("<corrupt: %14ld>"), psym->st_name);
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}
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printf ("\n");
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}
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printf ("\n");
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