Fix read-after-free error in readelf when processing multiple, relocated sections in an MSP430 binary.
PR binutils/21139 * readelf.c (target_specific_reloc_handling): Add num_syms parameter. Check for symbol table overflow before accessing symbol value. If reloc pointer is NULL, discard all saved state. (apply_relocations): Pass num_syms to target_specific_reloc_handling. Call target_specific_reloc_handling with a NULL reloc pointer after processing all of the relocs.
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@ -1,3 +1,13 @@
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2017-02-13 Nick Clifton <nickc@redhat.com>
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PR binutils/21139
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* readelf.c (target_specific_reloc_handling): Add num_syms
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parameter. Check for symbol table overflow before accessing
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symbol value. If reloc pointer is NULL, discard all saved state.
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(apply_relocations): Pass num_syms to target_specific_reloc_handling.
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Call target_specific_reloc_handling with a NULL reloc pointer
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after processing all of the relocs.
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2017-02-13 Nick Clifton <nickc@redhat.com>
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PR binutils/21137
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@ -11586,15 +11586,27 @@ process_syminfo (FILE * file ATTRIBUTE_UNUSED)
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/* Check to see if the given reloc needs to be handled in a target specific
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manner. If so then process the reloc and return TRUE otherwise return
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FALSE. */
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FALSE.
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If called with reloc == NULL, then this is a signal that reloc processing
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for the current section has finished, and any saved state should be
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discarded. */
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static bfd_boolean
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target_specific_reloc_handling (Elf_Internal_Rela * reloc,
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unsigned char * start,
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unsigned char * end,
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Elf_Internal_Sym * symtab)
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Elf_Internal_Sym * symtab,
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unsigned long num_syms)
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{
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unsigned int reloc_type = get_reloc_type (reloc->r_info);
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unsigned int reloc_type = 0;
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unsigned long sym_index = 0;
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if (reloc)
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{
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reloc_type = get_reloc_type (reloc->r_info);
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sym_index = get_reloc_symindex (reloc->r_info);
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}
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switch (elf_header.e_machine)
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{
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@ -11603,6 +11615,12 @@ target_specific_reloc_handling (Elf_Internal_Rela * reloc,
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{
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static Elf_Internal_Sym * saved_sym = NULL;
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if (reloc == NULL)
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{
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saved_sym = NULL;
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return TRUE;
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}
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switch (reloc_type)
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{
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case 10: /* R_MSP430_SYM_DIFF */
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@ -11610,7 +11628,12 @@ target_specific_reloc_handling (Elf_Internal_Rela * reloc,
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break;
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/* Fall through. */
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case 21: /* R_MSP430X_SYM_DIFF */
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saved_sym = symtab + get_reloc_symindex (reloc->r_info);
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/* PR 21139. */
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if (sym_index >= num_syms)
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error (_("MSP430 SYM_DIFF reloc contains invalid symbol index %lu\n"),
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sym_index);
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else
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saved_sym = symtab + sym_index;
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return TRUE;
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case 1: /* R_MSP430_32 or R_MSP430_ABS32 */
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@ -11635,16 +11658,21 @@ target_specific_reloc_handling (Elf_Internal_Rela * reloc,
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int reloc_size = reloc_type == 1 ? 4 : 2;
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bfd_vma value;
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value = reloc->r_addend
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+ (symtab[get_reloc_symindex (reloc->r_info)].st_value
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- saved_sym->st_value);
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if (start + reloc->r_offset + reloc_size >= end)
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/* PR 21137 */
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error (_("MSP430 sym diff reloc writes past end of section (%p vs %p)\n"),
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start + reloc->r_offset + reloc_size, end);
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if (sym_index >= num_syms)
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error (_("MSP430 reloc contains invalid symbol index %lu\n"),
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sym_index);
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else
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byte_put (start + reloc->r_offset, value, reloc_size);
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{
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value = reloc->r_addend + (symtab[sym_index].st_value
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- saved_sym->st_value);
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if (start + reloc->r_offset + reloc_size >= end)
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/* PR 21137 */
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error (_("MSP430 sym diff reloc writes past end of section (%p vs %p)\n"),
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start + reloc->r_offset + reloc_size, end);
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else
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byte_put (start + reloc->r_offset, value, reloc_size);
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}
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saved_sym = NULL;
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return TRUE;
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@ -11664,13 +11692,24 @@ target_specific_reloc_handling (Elf_Internal_Rela * reloc,
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{
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static Elf_Internal_Sym * saved_sym = NULL;
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if (reloc == NULL)
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{
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saved_sym = NULL;
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return TRUE;
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}
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switch (reloc_type)
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{
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case 34: /* R_MN10300_ALIGN */
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return TRUE;
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case 33: /* R_MN10300_SYM_DIFF */
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saved_sym = symtab + get_reloc_symindex (reloc->r_info);
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if (sym_index >= num_syms)
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error (_("MN10300_SYM_DIFF reloc contains invalid symbol index %lu\n"),
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sym_index);
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else
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saved_sym = symtab + sym_index;
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return TRUE;
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case 1: /* R_MN10300_32 */
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case 2: /* R_MN10300_16 */
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if (saved_sym != NULL)
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@ -11678,15 +11717,20 @@ target_specific_reloc_handling (Elf_Internal_Rela * reloc,
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int reloc_size = reloc_type == 1 ? 4 : 2;
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bfd_vma value;
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value = reloc->r_addend
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+ (symtab[get_reloc_symindex (reloc->r_info)].st_value
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- saved_sym->st_value);
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if (start + reloc->r_offset + reloc_size >= end)
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error (_("MN10300 sym diff reloc writes past end of section (%p vs %p)\n"),
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start + reloc->r_offset + reloc_size, end);
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if (sym_index >= num_syms)
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error (_("MN10300 reloc contains invalid symbol index %lu\n"),
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sym_index);
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else
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byte_put (start + reloc->r_offset, value, reloc_size);
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{
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value = reloc->r_addend + (symtab[sym_index].st_value
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- saved_sym->st_value);
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if (start + reloc->r_offset + reloc_size >= end)
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error (_("MN10300 sym diff reloc writes past end of section (%p vs %p)\n"),
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start + reloc->r_offset + reloc_size, end);
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else
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byte_put (start + reloc->r_offset, value, reloc_size);
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}
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saved_sym = NULL;
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return TRUE;
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@ -11706,12 +11750,24 @@ target_specific_reloc_handling (Elf_Internal_Rela * reloc,
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static bfd_vma saved_sym2 = 0;
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static bfd_vma value;
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if (reloc == NULL)
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{
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saved_sym1 = saved_sym2 = 0;
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return TRUE;
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}
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switch (reloc_type)
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{
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case 0x80: /* R_RL78_SYM. */
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saved_sym1 = saved_sym2;
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saved_sym2 = symtab[get_reloc_symindex (reloc->r_info)].st_value;
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saved_sym2 += reloc->r_addend;
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if (sym_index >= num_syms)
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error (_("RL78_SYM reloc contains invalid symbol index %lu\n"),
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sym_index);
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else
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{
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saved_sym2 = symtab[sym_index].st_value;
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saved_sym2 += reloc->r_addend;
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}
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return TRUE;
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case 0x83: /* R_RL78_OPsub. */
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@ -12360,7 +12416,7 @@ apply_relocations (void * file,
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reloc_type = get_reloc_type (rp->r_info);
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if (target_specific_reloc_handling (rp, start, end, symtab))
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if (target_specific_reloc_handling (rp, start, end, symtab, num_syms))
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continue;
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else if (is_none_reloc (reloc_type))
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continue;
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@ -12456,6 +12512,9 @@ apply_relocations (void * file,
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}
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free (symtab);
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/* Let the target specific reloc processing code know that
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we have finished with these relocs. */
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target_specific_reloc_handling (NULL, NULL, NULL, NULL, 0);
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if (relocs_return)
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{
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