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Fixes for invalid memory accesses triggered by running windres on corrupt binaries.
PR binutils/17512 * rcparse.y: Add checks to avoid integer divide by zero. * rescoff.c (read_coff_rsrc): Add check on the size of the resource section. (read_coff_res_dir): Add check on the nesting level. Check for resource names overrunning the buffer. * resrc.c (write_rc_messagetable): Update formatting. Add check of 'elen' being zero.
This commit is contained in:
Nick Clifton
parent
877a8638ba
commit
0897ec1581
@ -7,6 +7,14 @@
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* addr2line.c (slurp_symtab): If the symcount is zero, free the
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symbol table pointer.
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* rcparse.y: Add checks to avoid integer divide by zero.
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* rescoff.c (read_coff_rsrc): Add check on the size of the
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resource section.
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(read_coff_res_dir): Add check on the nesting level.
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Check for resource names overrunning the buffer.
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* resrc.c (write_rc_messagetable): Update formatting.
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Add check of 'elen' being zero.
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2015-01-23 Nick Clifton <nickc@redhat.com>
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* nlmconv.c (powerpc_mangle_relocs): Fix build errors introduced
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@ -1887,12 +1887,12 @@ sizednumexpr:
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}
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| sizednumexpr '/' sizednumexpr
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{
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$$.val = $1.val / $3.val;
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$$.val = $1.val / ($3.val ? $3.val : 1);
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$$.dword = $1.dword || $3.dword;
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}
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| sizednumexpr '%' sizednumexpr
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{
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$$.val = $1.val % $3.val;
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$$.val = $1.val % ($3.val ? $3.val : 1);
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$$.dword = $1.dword || $3.dword;
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}
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| sizednumexpr '+' sizednumexpr
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@ -1966,12 +1966,13 @@ sizedposnumexpr:
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}
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| sizedposnumexpr '/' sizednumexpr
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{
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$$.val = $1.val / $3.val;
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$$.val = $1.val / ($3.val ? $3.val : 1);
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$$.dword = $1.dword || $3.dword;
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}
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| sizedposnumexpr '%' sizednumexpr
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{
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$$.val = $1.val % $3.val;
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/* PR 17512: file: 89105a25. */
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$$.val = $1.val % ($3.val ? $3.val : 1);
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$$.dword = $1.dword || $3.dword;
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}
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| sizedposnumexpr '+' sizednumexpr
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@ -142,8 +142,14 @@ read_coff_rsrc (const char *filename, const char *target)
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set_windres_bfd (&wrbfd, abfd, sec, WR_KIND_BFD);
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size = bfd_section_size (abfd, sec);
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data = (bfd_byte *) res_alloc (size);
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/* PR 17512: file: 1b25ba5d
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The call to get_file_size here may be expensive
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but there is no other way to determine if the section size
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is reasonable. */
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if (size > (bfd_size_type) get_file_size (filename))
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fatal (_("%s: .rsrc section is bigger than the file!"), filename);
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data = (bfd_byte *) res_alloc (size);
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get_windres_bfd_content (&wrbfd, data, 0, size);
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flaginfo.filename = filename;
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@ -185,6 +191,13 @@ read_coff_res_dir (windres_bfd *wrbfd, const bfd_byte *data,
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rc_res_entry **pp;
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const struct extern_res_entry *ere;
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/* PR 17512: file: 09d80f53.
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Whilst in theory resources can nest to any level, in practice
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Microsoft only defines 3 levels. Corrupt files however might
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claim to use more. */
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if (level > 4)
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overrun (flaginfo, _("Resources nest too deep"));
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if ((size_t) (flaginfo->data_end - data) < sizeof (struct extern_res_directory))
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overrun (flaginfo, _("directory"));
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@ -234,7 +247,12 @@ read_coff_res_dir (windres_bfd *wrbfd, const bfd_byte *data,
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re->id.u.n.length = length;
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re->id.u.n.name = (unichar *) res_alloc (length * sizeof (unichar));
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for (j = 0; j < length; j++)
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re->id.u.n.name[j] = windres_get_16 (wrbfd, ers + j * 2 + 2, 2);
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{
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/* PR 17512: file: 05dc4a16. */
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if (length < 0 || ers >= (bfd_byte *) ere || ers + j * 2 + 4 >= (bfd_byte *) ere)
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overrun (flaginfo, _("resource name"));
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re->id.u.n.name[j] = windres_get_16 (wrbfd, ers + j * 2 + 2, 2);
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}
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if (level == 0)
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type = &re->id;
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102
binutils/resrc.c
102
binutils/resrc.c
@ -2932,53 +2932,63 @@ write_rc_messagetable (FILE *e, rc_uint_type length, const bfd_byte *data)
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if (length < BIN_MESSAGETABLE_SIZE)
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has_error = 1;
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else
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do {
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rc_uint_type m, i;
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mt = (const struct bin_messagetable *) data;
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m = windres_get_32 (&wrtarget, mt->cblocks, length);
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if (length < (BIN_MESSAGETABLE_SIZE + m * BIN_MESSAGETABLE_BLOCK_SIZE))
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{
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has_error = 1;
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break;
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}
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for (i = 0; i < m; i++)
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{
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rc_uint_type low, high, offset;
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const struct bin_messagetable_item *mti;
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do
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{
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rc_uint_type m, i;
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mt = (const struct bin_messagetable *) data;
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m = windres_get_32 (&wrtarget, mt->cblocks, length);
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if (length < (BIN_MESSAGETABLE_SIZE + m * BIN_MESSAGETABLE_BLOCK_SIZE))
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{
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has_error = 1;
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break;
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}
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for (i = 0; i < m; i++)
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{
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rc_uint_type low, high, offset;
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const struct bin_messagetable_item *mti;
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low = windres_get_32 (&wrtarget, mt->items[i].lowid, 4);
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high = windres_get_32 (&wrtarget, mt->items[i].highid, 4);
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offset = windres_get_32 (&wrtarget, mt->items[i].offset, 4);
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while (low <= high)
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{
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rc_uint_type elen, flags;
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if ((offset + BIN_MESSAGETABLE_ITEM_SIZE) > length)
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{
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has_error = 1;
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break;
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}
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mti = (const struct bin_messagetable_item *) &data[offset];
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elen = windres_get_16 (&wrtarget, mti->length, 2);
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flags = windres_get_16 (&wrtarget, mti->flags, 2);
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if ((offset + elen) > length)
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{
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has_error = 1;
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break;
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}
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wr_printcomment (e, "MessageId = 0x%x", low);
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wr_printcomment (e, "");
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/* PR 17512: file: 5c3232dc. */
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if (elen)
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{
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if ((flags & MESSAGE_RESOURCE_UNICODE) == MESSAGE_RESOURCE_UNICODE)
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unicode_print (e, (const unichar *) mti->data,
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(elen - BIN_MESSAGETABLE_ITEM_SIZE) / 2);
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else
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ascii_print (e, (const char *) mti->data,
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(elen - BIN_MESSAGETABLE_ITEM_SIZE));
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}
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wr_printcomment (e,"");
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++low;
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offset += elen;
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}
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}
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}
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while (0);
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low = windres_get_32 (&wrtarget, mt->items[i].lowid, 4);
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high = windres_get_32 (&wrtarget, mt->items[i].highid, 4);
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offset = windres_get_32 (&wrtarget, mt->items[i].offset, 4);
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while (low <= high)
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{
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rc_uint_type elen, flags;
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if ((offset + BIN_MESSAGETABLE_ITEM_SIZE) > length)
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{
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has_error = 1;
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break;
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}
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mti = (const struct bin_messagetable_item *) &data[offset];
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elen = windres_get_16 (&wrtarget, mti->length, 2);
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flags = windres_get_16 (&wrtarget, mti->flags, 2);
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if ((offset + elen) > length)
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{
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has_error = 1;
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break;
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}
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wr_printcomment (e, "MessageId = 0x%x", low);
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wr_printcomment (e, "");
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if ((flags & MESSAGE_RESOURCE_UNICODE) == MESSAGE_RESOURCE_UNICODE)
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unicode_print (e, (const unichar *) mti->data,
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(elen - BIN_MESSAGETABLE_ITEM_SIZE) / 2);
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else
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ascii_print (e, (const char *) mti->data,
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(elen - BIN_MESSAGETABLE_ITEM_SIZE));
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wr_printcomment (e,"");
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++low;
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offset += elen;
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}
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}
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} while (0);
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if (has_error)
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wr_printcomment (e, "Illegal data");
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wr_print_flush (e);
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