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Fix undefined arithmetic operations detected by -fsanitize=undefined when running readelf on fuzzed binaries.

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PR binutils/17512
	* dwarf.c (display_debug_loc): Pacify the undefined behaviour
	sanitizer by simplifying address difference calculation.
	(struct Frame_Chunk): Change type of cfa_offset to dwarf_vma in
	order to avoid arithmetic overflows.
	(frame_display_row): Cast cfa_offset before printing it.
	(display_debug_frames): Likewise.
	Check for an unexpected segment size.
	Chnage type of 'l' local to dwarf_vma and cast it back to an int
	when printing.
	(process_cu_tu_index): Tighten check for an invalid ncols value.
	* readelf.c (process_corefile_note_segment): Check for
	inote.descdata extending beyond the end of the section.
	(process_v850_notes): Likewise.
This commit is contained in:
Nick Clifton
2015-02-26 14:21:54 +00:00
parent 03eddd80d7
commit c8071705c6
3 changed files with 55 additions and 21 deletions
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38
binutils/dwarf.c
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@ -4719,11 +4719,11 @@ display_debug_loc (struct dwarf_section *section, void *file)
if (start < next)
warn (_("There is a hole [0x%lx - 0x%lx] in .debug_loc section.\n"),
(unsigned long) (start - section_begin),
(unsigned long) (next - section_begin));
(unsigned long) offset);
else if (start > next)
warn (_("There is an overlap [0x%lx - 0x%lx] in .debug_loc section.\n"),
(unsigned long) (start - section_begin),
(unsigned long) (next - section_begin));
(unsigned long) offset);
}
start = next;
@ -5244,7 +5244,7 @@ typedef struct Frame_Chunk
dwarf_vma pc_begin;
dwarf_vma pc_range;
int cfa_reg;
int cfa_offset;
dwarf_vma cfa_offset;
unsigned int ra;
unsigned char fde_encoding;
unsigned char cfa_exp;
@ -5481,7 +5481,7 @@ frame_display_row (Frame_Chunk *fc, int *need_col_headers, unsigned int *max_reg
if (fc->cfa_exp)
strcpy (tmp, "exp");
else
sprintf (tmp, "%s%+d", regname (fc->cfa_reg, 1), fc->cfa_offset);
sprintf (tmp, "%s%+d", regname (fc->cfa_reg, 1), (int) fc->cfa_offset);
printf ("%-8s ", tmp);
for (r = 0; r < fc->ncols; r++)
@ -5921,7 +5921,15 @@ display_debug_frames (struct dwarf_section *section,
segment_selector = 0;
if (fc->segment_size)
SAFE_BYTE_GET_AND_INC (segment_selector, start, fc->segment_size, end);
{
if (fc->segment_size > sizeof (segment_selector))
{
/* PR 17512: file: 9e196b3e. */
warn (_("Probably corrupt segment size: %d - using 4 instead\n"), fc->segment_size);
fc->segment_size = 4;
}
SAFE_BYTE_GET_AND_INC (segment_selector, start, fc->segment_size, end);
}
fc->pc_begin = get_encoded_value (&start, fc->fde_encoding, section, end);
@ -6123,7 +6131,7 @@ display_debug_frames (struct dwarf_section *section,
unsigned char * tmp;
unsigned op, opa;
unsigned long ul, reg, roffs;
long l;
dwarf_vma l;
dwarf_vma ofs;
dwarf_vma vma;
const char *reg_prefix = "";
@ -6375,7 +6383,7 @@ display_debug_frames (struct dwarf_section *section,
fc->cfa_exp = 0;
if (! do_debug_frames_interp)
printf (" DW_CFA_def_cfa: %s ofs %d\n",
regname (fc->cfa_reg, 0), fc->cfa_offset);
regname (fc->cfa_reg, 0), (int) fc->cfa_offset);
break;
case DW_CFA_def_cfa_register:
@ -6389,7 +6397,7 @@ display_debug_frames (struct dwarf_section *section,
case DW_CFA_def_cfa_offset:
fc->cfa_offset = LEB ();
if (! do_debug_frames_interp)
printf (" DW_CFA_def_cfa_offset: %d\n", fc->cfa_offset);
printf (" DW_CFA_def_cfa_offset: %d\n", (int) fc->cfa_offset);
break;
case DW_CFA_nop:
@ -6473,7 +6481,7 @@ display_debug_frames (struct dwarf_section *section,
if (! do_debug_frames_interp || *reg_prefix != '\0')
printf (" DW_CFA_offset_extended_sf: %s%s at cfa%+ld\n",
reg_prefix, regname (reg, 0),
l * fc->data_factor);
(long)(l * fc->data_factor));
if (*reg_prefix == '\0')
{
fc->col_type[reg] = DW_CFA_offset;
@ -6489,7 +6497,7 @@ display_debug_frames (struct dwarf_section *section,
if (! do_debug_frames_interp || *reg_prefix != '\0')
printf (" DW_CFA_val_offset_sf: %s%s at cfa%+ld\n",
reg_prefix, regname (reg, 0),
l * fc->data_factor);
(long)(l * fc->data_factor));
if (*reg_prefix == '\0')
{
fc->col_type[reg] = DW_CFA_val_offset;
@ -6504,14 +6512,14 @@ display_debug_frames (struct dwarf_section *section,
fc->cfa_exp = 0;
if (! do_debug_frames_interp)
printf (" DW_CFA_def_cfa_sf: %s ofs %d\n",
regname (fc->cfa_reg, 0), fc->cfa_offset);
regname (fc->cfa_reg, 0), (int) fc->cfa_offset);
break;
case DW_CFA_def_cfa_offset_sf:
fc->cfa_offset = SLEB ();
fc->cfa_offset = fc->cfa_offset * fc->data_factor;
fc->cfa_offset *= fc->data_factor;
if (! do_debug_frames_interp)
printf (" DW_CFA_def_cfa_offset_sf: %d\n", fc->cfa_offset);
printf (" DW_CFA_def_cfa_offset_sf: %d\n", (int) fc->cfa_offset);
break;
case DW_CFA_MIPS_advance_loc8:
@ -6546,7 +6554,7 @@ display_debug_frames (struct dwarf_section *section,
if (! do_debug_frames_interp || *reg_prefix != '\0')
printf (" DW_CFA_GNU_negative_offset_extended: %s%s at cfa%+ld\n",
reg_prefix, regname (reg, 0),
l * fc->data_factor);
(long)(l * fc->data_factor));
if (*reg_prefix == '\0')
{
fc->col_type[reg] = DW_CFA_offset;
@ -7026,7 +7034,7 @@ process_cu_tu_index (struct dwarf_section *section, int do_display)
/* PR 17531: file: 0dd159bf.
Check for wraparound with an overlarge ncols value. */
if ((unsigned int) ((poffsets - ppool) / 4) != ncols)
if (poffsets < ppool || (unsigned int) ((poffsets - ppool) / 4) != ncols)
{
warn (_("Overlarge number of columns: %x\n"), ncols);
return 0;