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PR22169, heap-based buffer overflow in read_1_byte

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The .debug_line header length field doesn't include the length field
itself, ie. it's the size of the rest of .debug_line.

	PR 22169
	* dwarf2.c (decode_line_info): Correct .debug_line unit_length check.
This commit is contained in:
Alan Modra 2017-09-24 14:36:16 +09:30
parent 0d76029f92
commit 515f23e63c
2 changed files with 9 additions and 3 deletions
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5
bfd/ChangeLog
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@ -1,3 +1,8 @@
2017-09-24 Alan Modra <amodra@gmail.com>
PR 22169
* dwarf2.c (decode_line_info): Correct .debug_line unit_length check.
2017-09-24 Alan Modra <amodra@gmail.com>
PR 22167

7
bfd/dwarf2.c
View File

@ -2096,12 +2096,13 @@ decode_line_info (struct comp_unit *unit, struct dwarf2_debug *stash)
offset_size = 8;
}
if (unit->line_offset + lh.total_length > stash->dwarf_line_size)
if (lh.total_length > (size_t) (line_end - line_ptr))
{
_bfd_error_handler
/* xgettext: c-format */
(_("Dwarf Error: Line info data is bigger (%#Lx) than the space remaining in the section (%#Lx)"),
lh.total_length, stash->dwarf_line_size - unit->line_offset);
(_("Dwarf Error: Line info data is bigger (%#Lx)"
" than the space remaining in the section (%#lx)"),
lh.total_length, (unsigned long) (line_end - line_ptr));
bfd_set_error (bfd_error_bad_value);
return NULL;
}