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More fixes for invalid memory accesses triggered by fuzzed binaries. 

PR binutils/17531
	* dwarf.c (display_debug_frames): Check for a negative
	augmentation data length.
	(display_gdb_index): Check for invalid offsets.
	* elfcomm.c (process_archive_index_and_symbols): Check for an
	index number that overflows when multiplied by the ar index size.
	* readelf.c (dump_ia64_unwind): Add range checks.
	(slurp_ia64_unwind_table): Change to a boolean function.  Add
	range checks.
	(process_version_sections): Add range checks.
	(get_symbol_version_string): Add check for missing section
	headers.
This commit is contained in:
Nick Clifton 2014-12-08 17:51:46 +00:00
parent 2ebecbb12e
commit 53774b7e76
4 changed files with 139 additions and 24 deletions
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15
binutils/ChangeLog
View File

@ -1,3 +1,18 @@
2014-12-08 Nick Clifton <nickc@redhat.com>
PR binutils/17531
* dwarf.c (display_debug_frames): Check for a negative
augmentation data length.
(display_gdb_index): Check for invalid offsets.
* elfcomm.c (process_archive_index_and_symbols): Check for an
index number that overflows when multiplied by the ar index size.
* readelf.c (dump_ia64_unwind): Add range checks.
(slurp_ia64_unwind_table): Change to a boolean function. Add
range checks.
(process_version_sections): Add range checks.
(get_symbol_version_string): Add check for missing section
headers.
2014-12-08 Senthil Kumar Selvaraj <senthil_kumar.selvaraj@atmel.com>
* configure.ac: Add od-elf32_avr to build.

70
binutils/dwarf.c
View File

@ -5787,7 +5787,7 @@ display_debug_frames (struct dwarf_section *section,
augmentation_data = start;
start += augmentation_data_len;
/* PR 17512: file: 722-8446-0.004. */
if (start >= end)
if (start >= end || ((signed long) augmentation_data_len) < 0)
{
warn (_("Corrupt augmentation data length: %lx\n"),
augmentation_data_len);
@ -6486,9 +6486,42 @@ display_gdb_index (struct dwarf_section *section,
return 0;
}
/* PR 17531: file: 418d0a8a. */
if (tu_list_offset < cu_list_offset)
{
warn (_("TU offset (%x) is less than CU offset (%x)\n"),
tu_list_offset, cu_list_offset);
return 0;
}
cu_list_elements = (tu_list_offset - cu_list_offset) / 8;
if (address_table_offset < tu_list_offset)
{
warn (_("Address table offset (%x) is less than TU offset (%x)\n"),
address_table_offset, tu_list_offset);
return 0;
}
tu_list_elements = (address_table_offset - tu_list_offset) / 8;
/* PR 17531: file: 18a47d3d. */
if (symbol_table_offset < address_table_offset)
{
warn (_("Symbolt table offset (%xl) is less then Address table offset (%x)\n"),
symbol_table_offset, address_table_offset);
return 0;
}
address_table_size = symbol_table_offset - address_table_offset;
if (constant_pool_offset < symbol_table_offset)
{
warn (_("Constant pool offset (%x) is less than symbol table offset (%x)\n"),
constant_pool_offset, symbol_table_offset);
return 0;
}
symbol_table_slots = (constant_pool_offset - symbol_table_offset) / 8;
cu_list = start + cu_list_offset;
@ -6523,7 +6556,7 @@ display_gdb_index (struct dwarf_section *section,
}
printf (_("\nAddress table:\n"));
for (i = 0; i < address_table_size; i += 2 * 8 + 4)
for (i = 0; i <= address_table_size - (2 * 8 + 4); i += 2 * 8 + 4)
{
uint64_t low = byte_get_little_endian (address_table + i, 8);
uint64_t high = byte_get_little_endian (address_table + i + 8, 8);
@ -6546,8 +6579,37 @@ display_gdb_index (struct dwarf_section *section,
{
unsigned int j;
printf ("[%3u] %s:", i, constant_pool + name_offset);
num_cus = byte_get_little_endian (constant_pool + cu_vector_offset, 4);
/* PR 17531: file: 5b7b07ad. */
if (constant_pool + name_offset < constant_pool
|| constant_pool + name_offset >= section->start + section->size)
{
printf (_("[%3u] <corrupt offset: %x>"), i, name_offset);
warn (_("Corrupt name offset of 0x%x found for symbol table slot %d\n"),
name_offset, i);
}
else
printf ("[%3u] %s:", i, constant_pool + name_offset);
if (constant_pool + cu_vector_offset < constant_pool
|| constant_pool + cu_vector_offset >= section->start + section->size)
{
printf (_("<invalid CU vector offset: %x>\n"), cu_vector_offset);
warn (_("Corrupt CU vector offset of 0x%x found for symbol table slot %d\n"),
cu_vector_offset, i);
continue;
}
else
num_cus = byte_get_little_endian (constant_pool + cu_vector_offset, 4);
if (constant_pool + cu_vector_offset + 4 + num_cus * 4 >=
section->start + section->size)
{
printf ("<invalid number of CUs: %d>\n", num_cus);
warn (_("Invalid number of CUs (%d) for symbol table slot %d\n"),
num_cus, i);
continue;
}
if (num_cus > 1)
printf ("\n");
for (j = 0; j < num_cus; ++j)

6
binutils/elfcomm.c
View File

@ -510,9 +510,11 @@ process_archive_index_and_symbols (struct archive_info * arch,
arch->index_num = byte_get_big_endian (integer_buffer, sizeof_ar_index);
size -= sizeof_ar_index;
if (size < arch->index_num * sizeof_ar_index)
if (size < arch->index_num * sizeof_ar_index
/* PR 17531: file: 585515d1. */
|| size < arch->index_num)
{
error (_("%s: the archive index is supposed to have %ld entries of %d bytes, but the size is only %ld\n"),
error (_("%s: the archive index is supposed to have 0x%lx entries of %d bytes, but the size is only 0x%lx\n"),
arch->file_name, (long) arch->index_num, sizeof_ar_index, size);
return FALSE;
}

72
binutils/readelf.c
View File

@ -6490,6 +6490,7 @@ dump_ia64_unwind (struct ia64_unw_aux_info * aux)
bfd_vma offset;
const unsigned char * dp;
const unsigned char * head;
const unsigned char * end;
const char * procname;
find_symbol_for_address (aux->symtab, aux->nsyms, aux->strtab,
@ -6512,6 +6513,18 @@ dump_ia64_unwind (struct ia64_unw_aux_info * aux)
printf ("], info at +0x%lx\n",
(unsigned long) (tp->info.offset - aux->seg_base));
/* PR 17531: file: 86232b32. */
if (aux->info == NULL)
continue;
/* PR 17531: file: 0997b4d1. */
if ((ABSADDR (tp->info) - aux->info_addr) >= aux->info_size)
{
warn (_("Invalid offset %lx in table entry %ld\n"),
(long) tp->info.offset, (long) (tp - aux->table));
continue;
}
head = aux->info + (ABSADDR (tp->info) - aux->info_addr);
stamp = byte_get ((unsigned char *) head, sizeof (stamp));
@ -6529,12 +6542,16 @@ dump_ia64_unwind (struct ia64_unw_aux_info * aux)
}
in_body = 0;
for (dp = head + 8; dp < head + 8 + eh_addr_size * UNW_LENGTH (stamp);)
end = head + 8 + eh_addr_size * UNW_LENGTH (stamp);
/* PR 17531: file: 16ceda89. */
if (end > aux->info + aux->info_size)
end = aux->info + aux->info_size;
for (dp = head + 8; dp < end;)
dp = unw_decode (dp, in_body, & in_body);
}
}
static int
static bfd_boolean
slurp_ia64_unwind_table (FILE * file,
struct ia64_unw_aux_info * aux,
Elf_Internal_Shdr * sec)
@ -6550,13 +6567,15 @@ slurp_ia64_unwind_table (FILE * file,
Elf_Internal_Sym * sym;
const char * relname;
aux->table_len = 0;
/* First, find the starting address of the segment that includes
this section: */
if (elf_header.e_phnum)
{
if (! get_program_headers (file))
return 0;
return FALSE;
for (seg = program_headers;
seg < program_headers + elf_header.e_phnum;
@ -6579,12 +6598,14 @@ slurp_ia64_unwind_table (FILE * file,
table = (unsigned char *) get_data (NULL, file, sec->sh_offset, 1, size,
_("unwind table"));
if (!table)
return 0;
return FALSE;
aux->table_len = size / (3 * eh_addr_size);
aux->table = (struct ia64_unw_table_entry *)
xcmalloc (size / (3 * eh_addr_size), sizeof (aux->table[0]));
xcmalloc (aux->table_len, sizeof (aux->table[0]));
tep = aux->table;
for (tp = table; tp < table + size; ++tep)
for (tp = table; tp <= table + size - (3 * eh_addr_size); ++tep)
{
tep->start.section = SHN_UNDEF;
tep->end.section = SHN_UNDEF;
@ -6610,7 +6631,12 @@ slurp_ia64_unwind_table (FILE * file,
if (!slurp_rela_relocs (file, relsec->sh_offset, relsec->sh_size,
& rela, & nrelas))
return 0;
{
free (aux->table);
aux->table = NULL;
aux->table_len = 0;
return FALSE;
}
for (rp = rela; rp < rela + nrelas; ++rp)
{
@ -6625,7 +6651,14 @@ slurp_ia64_unwind_table (FILE * file,
i = rp->r_offset / (3 * eh_addr_size);
switch (rp->r_offset/eh_addr_size % 3)
/* PR 17531: file: 5bc8d9bf. */
if (i >= aux->table_len)
{
warn (_("Skipping reloc with overlarge offset: %lx\n"), i);
continue;
}
switch (rp->r_offset / eh_addr_size % 3)
{
case 0:
aux->table[i].start.section = sym->st_shndx;
@ -6647,8 +6680,7 @@ slurp_ia64_unwind_table (FILE * file,
free (rela);
}
aux->table_len = size / (3 * eh_addr_size);
return 1;
return TRUE;
}
static void
@ -6785,9 +6817,8 @@ ia64_process_unwind (FILE * file)
(unsigned long) unwsec->sh_offset,
(unsigned long) (unwsec->sh_size / (3 * eh_addr_size)));
(void) slurp_ia64_unwind_table (file, & aux, unwsec);
if (aux.table_len > 0)
if (slurp_ia64_unwind_table (file, & aux, unwsec)
&& aux.table_len > 0)
dump_ia64_unwind (& aux);
if (aux.table)
@ -9406,7 +9437,6 @@ process_version_sections (FILE * file)
/* Check for overflow. */
if (ent.vn_aux > (size_t) (endbuf - vstart))
break;
vstart += ent.vn_aux;
for (j = 0, isum = idx + ent.vn_aux; j < ent.vn_cnt; ++j)
@ -9435,9 +9465,14 @@ process_version_sections (FILE * file)
get_ver_flags (aux.vna_flags), aux.vna_other);
/* Check for overflow. */
if (aux.vna_next > (size_t) (endbuf - vstart))
break;
if (aux.vna_next > (size_t) (endbuf - vstart)
|| (aux.vna_next == 0 && j < ent.vn_cnt - 1))
{
warn (_("Invalid vna_next field of %lx\n"),
aux.vna_next);
j = ent.vn_cnt;
break;
}
isum += aux.vna_next;
vstart += aux.vna_next;
}
@ -10114,7 +10149,8 @@ get_symbol_version_string (FILE *file, int is_dynsym,
vers_data = byte_get (data, 2);
is_nobits = (psym->st_shndx < elf_header.e_shnum
is_nobits = (section_headers != NULL
&& psym->st_shndx < elf_header.e_shnum
&& section_headers[psym->st_shndx].sh_type
== SHT_NOBITS);