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Avoid coff OOM
bfd_zalloc/bfd_zmalloc to fix uninitialized memory reads is too big a hammer, when the size allocated depends on user input. A typical bfd_alloc, bfd_seek, bfd_bread sequence will give an error or warning at the point the file read fails when some enormous item as described by headers is not actually present in the file. Nice operating system allow memory overcommit. But not if you write to the memory. So bfd_zalloc can cause an OOM, thrashing, or system hangs. The patch also fixes a recently introduced endless loop on bad input. PR binutils/17512 * coffcode.h (coff_slurp_line_table): Don't bfd_zalloc, just memset the particular bits we need. Update src after hitting loop "continue". Don't count lineno omitted due to invalid symbols in nbr_func, and update lineno_count. Init entire terminating lineno. Don't both allocating terminator in n_lineno_cache. Redirect sym->lineno pointer to where n_lineno_cache will be copied, and free n_lineno_cache. * pe-mips.c (NUM_HOWTOS): Typo fix.
This commit is contained in:
Alan Modra
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4de1599bcf
commit
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@ -1,3 +1,15 @@
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2014-11-11 Alan Modra <amodra@gmail.com>
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PR binutils/17512
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* coffcode.h (coff_slurp_line_table): Don't bfd_zalloc, just
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memset the particular bits we need. Update src after hitting loop
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"continue". Don't count lineno omitted due to invalid symbols in
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nbr_func, and update lineno_count. Init entire terminating
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lineno. Don't both allocating terminator in n_lineno_cache.
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Redirect sym->lineno pointer to where n_lineno_cache will be
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copied, and free n_lineno_cache.
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* pe-mips.c (NUM_HOWTOS): Typo fix.
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2014-11-11 Alan Modra <amodra@gmail.com>
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* elf-eh-frame.c (_bfd_elf_write_section_eh_frame): Adjust section
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@ -4517,7 +4517,7 @@ coff_slurp_line_table (bfd *abfd, asection *asect)
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BFD_ASSERT (asect->lineno == NULL);
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amt = ((bfd_size_type) asect->lineno_count + 1) * sizeof (alent);
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lineno_cache = (alent *) bfd_zalloc (abfd, amt);
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lineno_cache = (alent *) bfd_alloc (abfd, amt);
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if (lineno_cache == NULL)
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return FALSE;
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@ -4536,22 +4536,24 @@ coff_slurp_line_table (bfd *abfd, asection *asect)
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src = native_lineno;
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nbr_func = 0;
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for (counter = 0; counter < asect->lineno_count; counter++)
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for (counter = 0; counter < asect->lineno_count; counter++, src++)
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{
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struct internal_lineno dst;
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bfd_coff_swap_lineno_in (abfd, src, &dst);
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cache_ptr->line_number = dst.l_lnno;
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/* Appease memory checkers that get all excited about
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uninitialised memory when copying alents if u.offset is
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larger than u.sym. (64-bit BFD on 32-bit host.) */
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memset (&cache_ptr->u, 0, sizeof (cache_ptr->u));
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if (cache_ptr->line_number == 0)
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{
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bfd_signed_vma symndx;
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bfd_vma symndx;
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coff_symbol_type *sym;
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nbr_func++;
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symndx = dst.l_addr.l_symndx;
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if (symndx < 0
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|| (bfd_vma) symndx >= obj_raw_syment_count (abfd))
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if (symndx >= obj_raw_syment_count (abfd))
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{
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(*_bfd_error_handler)
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(_("%B: warning: illegal symbol index 0x%lx in line number entry %d"),
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@ -4567,13 +4569,16 @@ coff_slurp_line_table (bfd *abfd, asection *asect)
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/* PR 17512 file: 078-10659-0.004 */
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if (sym < obj_symbols (abfd)
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|| sym > obj_symbols (abfd) + obj_raw_syment_count (abfd))
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sym = NULL;
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cache_ptr->u.sym = (asymbol *) sym;
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if (sym == NULL)
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|| sym >= obj_symbols (abfd) + obj_raw_syment_count (abfd))
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{
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(*_bfd_error_handler)
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(_("%B: warning: illegal symbol in line number entry %d"),
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abfd, counter);
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continue;
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}
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nbr_func++;
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cache_ptr->u.sym = (asymbol *) sym;
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if (sym->lineno != NULL)
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(*_bfd_error_handler)
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(_("%B: warning: duplicate line number information for `%s'"),
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@ -4585,14 +4590,13 @@ coff_slurp_line_table (bfd *abfd, asection *asect)
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prev_offset = sym->symbol.value;
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}
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else
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cache_ptr->u.offset = dst.l_addr.l_paddr
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- bfd_section_vma (abfd, asect);
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cache_ptr->u.offset = (dst.l_addr.l_paddr
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- bfd_section_vma (abfd, asect));
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cache_ptr++;
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src++;
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}
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cache_ptr->line_number = 0;
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asect->lineno_count = cache_ptr - lineno_cache;
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memset (cache_ptr, 0, sizeof (*cache_ptr));
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bfd_release (abfd, native_lineno);
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/* On some systems (eg AIX5.3) the lineno table may not be sorted. */
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@ -4617,8 +4621,8 @@ coff_slurp_line_table (bfd *abfd, asection *asect)
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qsort (func_table, nbr_func, sizeof (alent *), coff_sort_func_alent);
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/* Create the new sorted table. */
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amt = ((bfd_size_type) asect->lineno_count + 1) * sizeof (alent);
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n_lineno_cache = (alent *) bfd_zalloc (abfd, amt);
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amt = (bfd_size_type) asect->lineno_count * sizeof (alent);
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n_lineno_cache = (alent *) bfd_alloc (abfd, amt);
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if (n_lineno_cache != NULL)
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{
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alent *n_cache_ptr = n_lineno_cache;
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@ -4628,23 +4632,20 @@ coff_slurp_line_table (bfd *abfd, asection *asect)
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coff_symbol_type *sym;
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alent *old_ptr = func_table[i];
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/* Copy the function entry and update it. */
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*n_cache_ptr = *old_ptr;
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sym = (coff_symbol_type *) n_cache_ptr->u.sym;
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if (sym != NULL)
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sym->lineno = n_cache_ptr;
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n_cache_ptr++;
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old_ptr++;
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/* Update the function entry. */
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sym = (coff_symbol_type *) old_ptr->u.sym;
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/* PR binutils/17512: Point the lineno to where
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this entry will be after the memcpy below. */
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sym->lineno = lineno_cache + (n_cache_ptr - n_lineno_cache);
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/* Copy the line number entries. */
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while (old_ptr->line_number != 0)
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/* Copy the function and line number entries. */
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do
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*n_cache_ptr++ = *old_ptr++;
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while (old_ptr->line_number != 0);
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}
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n_cache_ptr->line_number = 0;
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memcpy (lineno_cache, n_lineno_cache, amt);
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}
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/* PR binutils/17512: Do *not* free the func table
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and new lineno cache - they are now being used. */
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bfd_release (abfd, func_table);
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}
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}
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@ -339,7 +339,7 @@ static reloc_howto_type howto_table[] =
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FALSE), /* Pcrel_offset. */
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};
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#define NUM_HOWTOS ((sizeof (howto_table) / sizeof (howto_table[0]))
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#define NUM_HOWTOS (sizeof (howto_table) / sizeof (howto_table[0]))
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/* Turn a howto into a reloc nunmber. */
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