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Fix illegal memory access whilst parsing corrupt DWARF debug information.

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PR 28645
	* dwarf.c (process_cu_tu_index): Add test for overruning section
	whilst processing slots.
This commit is contained in:
Nick Clifton 2021-12-02 17:48:20 +00:00
parent 2e18755037
commit 117e35f519
2 changed files with 22 additions and 2 deletions
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6
binutils/ChangeLog
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@ -1,3 +1,9 @@
2021-12-02 Nick Clifton <nickc@redhat.com>
PR 28645
* dwarf.c (process_cu_tu_index): Add test for overruning section
whilst processing slots.
2021-11-30 Roland McGrath <mcgrathr@google.com>
* doc/local.mk: Give each man page target its missing dependency on

18
binutils/dwarf.c
View File

@ -10465,7 +10465,7 @@ process_cu_tu_index (struct dwarf_section *section, int do_display)
Check for integer overflow (can occur when size_t is 32-bit)
with overlarge ncols or nused values. */
if (nused == -1u
|| _mul_overflow ((size_t) ncols, 4, &temp)
|| _mul_overflow ((size_t) ncols, 4, &temp)
|| _mul_overflow ((size_t) nused + 1, temp, &total)
|| total > (size_t) (limit - ppool))
{
@ -10473,7 +10473,7 @@ process_cu_tu_index (struct dwarf_section *section, int do_display)
section->name);
return 0;
}
if (do_display)
{
printf (_(" Offset table\n"));
@ -10596,7 +10596,21 @@ process_cu_tu_index (struct dwarf_section *section, int do_display)
for (j = 0; j < ncols; j++)
{
unsigned char *p = prow + j * 4;
/* PR 28645: Check for overflow. Since we do not know how
many populated rows there will be, we cannot just
perform a single check at the start of this function. */
if (p > (limit - 4))
{
if (do_display)
printf ("\n");
warn (_("Too many rows/columns in DWARF index section %s\n"),
section->name);
return 0;
}
SAFE_BYTE_GET (val, p, 4, limit);
if (do_display)
printf (" %8d", val);
else