display_debug_frames
* dwarf.c (display_debug_frames): Delete initial_length_size. Avoid pointer UB. Constrain data reads to length given in header. Sanity check cie header length. Only skip up to next FDE on finding augmentation data too long.
This commit is contained in:
Alan Modra
parent
c93c4a8540
commit
5897a38984
2 changed files with 114 additions and 103 deletions
210
binutils/dwarf.c
210
binutils/dwarf.c
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@ -8587,7 +8587,6 @@ display_debug_frames (struct dwarf_section *section,
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bfd_size_type augmentation_data_len = 0;
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unsigned int encoded_ptr_size = saved_eh_addr_size;
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unsigned int offset_size;
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unsigned int initial_length_size;
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bool all_nops;
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static Frame_Chunk fde_fc;
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@ -8612,24 +8611,21 @@ display_debug_frames (struct dwarf_section *section,
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{
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SAFE_BYTE_GET_AND_INC (length, start, 8, end);
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offset_size = 8;
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initial_length_size = 12;
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}
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else
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{
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offset_size = 4;
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initial_length_size = 4;
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}
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offset_size = 4;
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block_end = saved_start + length + initial_length_size;
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if (block_end > end || block_end < start)
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if (length > (size_t) (end - start))
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{
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warn ("Invalid length 0x%s in FDE at %#08lx\n",
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dwarf_vmatoa_1 (NULL, length, offset_size),
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(unsigned long) (saved_start - section_start));
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block_end = end;
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}
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else
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block_end = start + length;
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SAFE_BYTE_GET_AND_INC (cie_id, start, offset_size, end);
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SAFE_BYTE_GET_AND_INC (cie_id, start, offset_size, block_end);
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if (is_eh ? (cie_id == 0) : ((offset_size == 4 && cie_id == DW_CIE_ID)
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|| (offset_size == 8 && cie_id == DW64_CIE_ID)))
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@ -8637,7 +8633,7 @@ display_debug_frames (struct dwarf_section *section,
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int version;
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unsigned int mreg;
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start = read_cie (start, end, &cie, &version,
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start = read_cie (start, block_end, &cie, &version,
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&augmentation_data_len, &augmentation_data);
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/* PR 17512: file: 027-135133-0.005. */
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if (cie == NULL)
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@ -8725,11 +8721,13 @@ display_debug_frames (struct dwarf_section *section,
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SAFE_BYTE_GET_AND_INC (length, cie_scan, 8, end);
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off_size = 8;
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}
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if (length != 0)
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if (length != 0 && length <= (size_t) (end - cie_scan))
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{
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dwarf_vma c_id;
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unsigned char *cie_end = cie_scan + length;
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SAFE_BYTE_GET_AND_INC (c_id, cie_scan, off_size, end);
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SAFE_BYTE_GET_AND_INC (c_id, cie_scan, off_size,
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cie_end);
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if (is_eh
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? c_id == 0
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: ((off_size == 4 && c_id == DW_CIE_ID)
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@ -8738,7 +8736,7 @@ display_debug_frames (struct dwarf_section *section,
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int version;
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unsigned int mreg;
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read_cie (cie_scan, end, &cie, &version,
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read_cie (cie_scan, cie_end, &cie, &version,
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&augmentation_data_len, &augmentation_data);
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/* PR 17512: file: 3450-2098-0.004. */
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if (cie == NULL)
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@ -8823,29 +8821,32 @@ display_debug_frames (struct dwarf_section *section,
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warn (_("Probably corrupt segment size: %d - using 4 instead\n"), fc->segment_size);
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fc->segment_size = 4;
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}
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SAFE_BYTE_GET_AND_INC (segment_selector, start, fc->segment_size, end);
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SAFE_BYTE_GET_AND_INC (segment_selector, start,
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fc->segment_size, block_end);
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}
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fc->pc_begin = get_encoded_value (&start, fc->fde_encoding, section, end);
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fc->pc_begin = get_encoded_value (&start, fc->fde_encoding, section,
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block_end);
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/* FIXME: It appears that sometimes the final pc_range value is
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encoded in less than encoded_ptr_size bytes. See the x86_64
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run of the "objcopy on compressed debug sections" test for an
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example of this. */
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SAFE_BYTE_GET_AND_INC (fc->pc_range, start, encoded_ptr_size, end);
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SAFE_BYTE_GET_AND_INC (fc->pc_range, start, encoded_ptr_size,
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block_end);
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if (cie->augmentation[0] == 'z')
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{
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READ_ULEB (augmentation_data_len, start, end);
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READ_ULEB (augmentation_data_len, start, block_end);
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augmentation_data = start;
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/* PR 17512 file: 722-8446-0.004 and PR 22386. */
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if (augmentation_data_len > (bfd_size_type) (end - start))
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if (augmentation_data_len > (bfd_size_type) (block_end - start))
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{
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warn (_("Augmentation data too long: 0x%s, "
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"expected at most %#lx\n"),
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dwarf_vmatoa ("x", augmentation_data_len),
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(unsigned long) (end - start));
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start = end;
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(unsigned long) (block_end - start));
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start = block_end;
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augmentation_data = NULL;
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augmentation_data_len = 0;
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}
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@ -8889,7 +8890,6 @@ display_debug_frames (struct dwarf_section *section,
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{
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unsigned int reg, op, opa;
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unsigned long temp;
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unsigned char * new_start;
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op = *start++;
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opa = op & 0x3f;
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@ -8903,7 +8903,7 @@ display_debug_frames (struct dwarf_section *section,
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case DW_CFA_advance_loc:
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break;
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case DW_CFA_offset:
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SKIP_ULEB (start, end);
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SKIP_ULEB (start, block_end);
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if (frame_need_space (fc, opa) >= 0)
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fc->col_type[opa] = DW_CFA_undefined;
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break;
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@ -8912,105 +8912,111 @@ display_debug_frames (struct dwarf_section *section,
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fc->col_type[opa] = DW_CFA_undefined;
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break;
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case DW_CFA_set_loc:
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start += encoded_ptr_size;
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if ((size_t) (block_end - start) < encoded_ptr_size)
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start = block_end;
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else
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start += encoded_ptr_size;
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break;
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case DW_CFA_advance_loc1:
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start += 1;
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if ((size_t) (block_end - start) < 1)
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start = block_end;
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else
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start += 1;
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break;
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case DW_CFA_advance_loc2:
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start += 2;
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if ((size_t) (block_end - start) < 2)
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start = block_end;
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else
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start += 2;
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break;
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case DW_CFA_advance_loc4:
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start += 4;
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if ((size_t) (block_end - start) < 4)
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start = block_end;
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else
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start += 4;
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break;
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case DW_CFA_offset_extended:
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case DW_CFA_val_offset:
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READ_ULEB (reg, start, end);
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SKIP_ULEB (start, end);
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READ_ULEB (reg, start, block_end);
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SKIP_ULEB (start, block_end);
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if (frame_need_space (fc, reg) >= 0)
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fc->col_type[reg] = DW_CFA_undefined;
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break;
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case DW_CFA_restore_extended:
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READ_ULEB (reg, start, end);
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READ_ULEB (reg, start, block_end);
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if (frame_need_space (fc, reg) >= 0)
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fc->col_type[reg] = DW_CFA_undefined;
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break;
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case DW_CFA_undefined:
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READ_ULEB (reg, start, end);
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READ_ULEB (reg, start, block_end);
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if (frame_need_space (fc, reg) >= 0)
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fc->col_type[reg] = DW_CFA_undefined;
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break;
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case DW_CFA_same_value:
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READ_ULEB (reg, start, end);
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READ_ULEB (reg, start, block_end);
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if (frame_need_space (fc, reg) >= 0)
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fc->col_type[reg] = DW_CFA_undefined;
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break;
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case DW_CFA_register:
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READ_ULEB (reg, start, end);
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SKIP_ULEB (start, end);
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READ_ULEB (reg, start, block_end);
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SKIP_ULEB (start, block_end);
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if (frame_need_space (fc, reg) >= 0)
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fc->col_type[reg] = DW_CFA_undefined;
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break;
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case DW_CFA_def_cfa:
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SKIP_ULEB (start, end);
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SKIP_ULEB (start, end);
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SKIP_ULEB (start, block_end);
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SKIP_ULEB (start, block_end);
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break;
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case DW_CFA_def_cfa_register:
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SKIP_ULEB (start, end);
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SKIP_ULEB (start, block_end);
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break;
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case DW_CFA_def_cfa_offset:
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SKIP_ULEB (start, end);
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SKIP_ULEB (start, block_end);
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break;
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case DW_CFA_def_cfa_expression:
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READ_ULEB (temp, start, end);
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new_start = start + temp;
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if (new_start < start)
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{
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warn (_("Corrupt CFA_def expression value: %lu\n"), temp);
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start = block_end;
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}
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READ_ULEB (temp, start, block_end);
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if ((size_t) (block_end - start) < temp)
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start = block_end;
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else
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start = new_start;
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start += temp;
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break;
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case DW_CFA_expression:
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case DW_CFA_val_expression:
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READ_ULEB (reg, start, end);
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READ_ULEB (temp, start, end);
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new_start = start + temp;
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if (new_start < start)
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{
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/* PR 17512: file:306-192417-0.005. */
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warn (_("Corrupt CFA expression value: %lu\n"), temp);
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start = block_end;
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}
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READ_ULEB (reg, start, block_end);
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READ_ULEB (temp, start, block_end);
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if ((size_t) (block_end - start) < temp)
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start = block_end;
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else
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start = new_start;
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start += temp;
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if (frame_need_space (fc, reg) >= 0)
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fc->col_type[reg] = DW_CFA_undefined;
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break;
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case DW_CFA_offset_extended_sf:
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case DW_CFA_val_offset_sf:
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READ_ULEB (reg, start, end);
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SKIP_SLEB (start, end);
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READ_ULEB (reg, start, block_end);
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SKIP_SLEB (start, block_end);
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if (frame_need_space (fc, reg) >= 0)
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fc->col_type[reg] = DW_CFA_undefined;
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break;
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case DW_CFA_def_cfa_sf:
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SKIP_ULEB (start, end);
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SKIP_SLEB (start, end);
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SKIP_ULEB (start, block_end);
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SKIP_SLEB (start, block_end);
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break;
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case DW_CFA_def_cfa_offset_sf:
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SKIP_SLEB (start, end);
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SKIP_SLEB (start, block_end);
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break;
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case DW_CFA_MIPS_advance_loc8:
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start += 8;
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if ((size_t) (block_end - start) < 8)
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start = block_end;
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else
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start += 8;
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break;
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case DW_CFA_GNU_args_size:
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SKIP_ULEB (start, end);
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SKIP_ULEB (start, block_end);
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break;
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case DW_CFA_GNU_negative_offset_extended:
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READ_ULEB (reg, start, end);
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SKIP_ULEB (start, end);
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READ_ULEB (reg, start, block_end);
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SKIP_ULEB (start, block_end);
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if (frame_need_space (fc, reg) >= 0)
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fc->col_type[reg] = DW_CFA_undefined;
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break;
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@ -9028,7 +9034,6 @@ display_debug_frames (struct dwarf_section *section,
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while (start < block_end)
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{
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unsigned char * tmp;
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unsigned op, opa;
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unsigned long ul, roffs;
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/* Note: It is tempting to use an unsigned long for 'reg' but there
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@ -9066,7 +9071,7 @@ display_debug_frames (struct dwarf_section *section,
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break;
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case DW_CFA_offset:
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READ_ULEB (roffs, start, end);
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READ_ULEB (roffs, start, block_end);
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if (opa >= (unsigned int) fc->ncols)
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reg_prefix = bad_reg;
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if (! do_debug_frames_interp || *reg_prefix != '\0')
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@ -9104,7 +9109,8 @@ display_debug_frames (struct dwarf_section *section,
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break;
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case DW_CFA_set_loc:
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vma = get_encoded_value (&start, fc->fde_encoding, section, block_end);
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vma = get_encoded_value (&start, fc->fde_encoding, section,
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block_end);
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if (do_debug_frames_interp)
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frame_display_row (fc, &need_col_headers, &max_regs);
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else
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@ -9114,7 +9120,7 @@ display_debug_frames (struct dwarf_section *section,
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break;
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case DW_CFA_advance_loc1:
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SAFE_BYTE_GET_AND_INC (ofs, start, 1, end);
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SAFE_BYTE_GET_AND_INC (ofs, start, 1, block_end);
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if (do_debug_frames_interp)
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frame_display_row (fc, &need_col_headers, &max_regs);
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else
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@ -9153,8 +9159,8 @@ display_debug_frames (struct dwarf_section *section,
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break;
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case DW_CFA_offset_extended:
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READ_ULEB (reg, start, end);
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READ_ULEB (roffs, start, end);
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READ_ULEB (reg, start, block_end);
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READ_ULEB (roffs, start, block_end);
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if (reg >= (unsigned int) fc->ncols)
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reg_prefix = bad_reg;
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if (! do_debug_frames_interp || *reg_prefix != '\0')
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@ -9169,8 +9175,8 @@ display_debug_frames (struct dwarf_section *section,
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break;
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case DW_CFA_val_offset:
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READ_ULEB (reg, start, end);
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READ_ULEB (roffs, start, end);
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READ_ULEB (reg, start, block_end);
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READ_ULEB (roffs, start, block_end);
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if (reg >= (unsigned int) fc->ncols)
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reg_prefix = bad_reg;
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if (! do_debug_frames_interp || *reg_prefix != '\0')
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@ -9185,7 +9191,7 @@ display_debug_frames (struct dwarf_section *section,
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break;
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case DW_CFA_restore_extended:
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READ_ULEB (reg, start, end);
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READ_ULEB (reg, start, block_end);
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if (reg >= (unsigned int) fc->ncols)
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reg_prefix = bad_reg;
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if (! do_debug_frames_interp || *reg_prefix != '\0')
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@ -9207,7 +9213,7 @@ display_debug_frames (struct dwarf_section *section,
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break;
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case DW_CFA_undefined:
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READ_ULEB (reg, start, end);
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READ_ULEB (reg, start, block_end);
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if (reg >= (unsigned int) fc->ncols)
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reg_prefix = bad_reg;
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if (! do_debug_frames_interp || *reg_prefix != '\0')
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@ -9221,7 +9227,7 @@ display_debug_frames (struct dwarf_section *section,
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break;
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case DW_CFA_same_value:
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READ_ULEB (reg, start, end);
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READ_ULEB (reg, start, block_end);
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if (reg >= (unsigned int) fc->ncols)
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reg_prefix = bad_reg;
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if (! do_debug_frames_interp || *reg_prefix != '\0')
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@ -9235,8 +9241,8 @@ display_debug_frames (struct dwarf_section *section,
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break;
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case DW_CFA_register:
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READ_ULEB (reg, start, end);
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READ_ULEB (roffs, start, end);
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READ_ULEB (reg, start, block_end);
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READ_ULEB (roffs, start, block_end);
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if (reg >= (unsigned int) fc->ncols)
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reg_prefix = bad_reg;
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if (! do_debug_frames_interp || *reg_prefix != '\0')
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@ -9299,8 +9305,8 @@ display_debug_frames (struct dwarf_section *section,
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break;
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case DW_CFA_def_cfa:
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READ_ULEB (fc->cfa_reg, start, end);
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READ_ULEB (fc->cfa_offset, start, end);
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READ_ULEB (fc->cfa_reg, start, block_end);
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READ_ULEB (fc->cfa_offset, start, block_end);
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fc->cfa_exp = 0;
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if (! do_debug_frames_interp)
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printf (" DW_CFA_def_cfa: %s ofs %d\n",
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@ -9308,7 +9314,7 @@ display_debug_frames (struct dwarf_section *section,
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break;
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case DW_CFA_def_cfa_register:
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READ_ULEB (fc->cfa_reg, start, end);
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READ_ULEB (fc->cfa_reg, start, block_end);
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fc->cfa_exp = 0;
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if (! do_debug_frames_interp)
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printf (" DW_CFA_def_cfa_register: %s\n",
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@ -9316,7 +9322,7 @@ display_debug_frames (struct dwarf_section *section,
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break;
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case DW_CFA_def_cfa_offset:
|
||||
READ_ULEB (fc->cfa_offset, start, end);
|
||||
READ_ULEB (fc->cfa_offset, start, block_end);
|
||||
if (! do_debug_frames_interp)
|
||||
printf (" DW_CFA_def_cfa_offset: %d\n", (int) fc->cfa_offset);
|
||||
break;
|
||||
|
|
@ -9327,8 +9333,8 @@ display_debug_frames (struct dwarf_section *section,
|
|||
break;
|
||||
|
||||
case DW_CFA_def_cfa_expression:
|
||||
READ_ULEB (ul, start, end);
|
||||
if (start >= block_end || ul > (unsigned long) (block_end - start))
|
||||
READ_ULEB (ul, start, block_end);
|
||||
if (ul > (size_t) (block_end - start))
|
||||
{
|
||||
printf (_(" DW_CFA_def_cfa_expression: <corrupt len %lu>\n"), ul);
|
||||
break;
|
||||
|
|
@ -9345,14 +9351,13 @@ display_debug_frames (struct dwarf_section *section,
|
|||
break;
|
||||
|
||||
case DW_CFA_expression:
|
||||
READ_ULEB (reg, start, end);
|
||||
READ_ULEB (ul, start, end);
|
||||
READ_ULEB (reg, start, block_end);
|
||||
READ_ULEB (ul, start, block_end);
|
||||
if (reg >= (unsigned int) fc->ncols)
|
||||
reg_prefix = bad_reg;
|
||||
/* PR 17512: file: 069-133014-0.006. */
|
||||
/* PR 17512: file: 98c02eb4. */
|
||||
tmp = start + ul;
|
||||
if (start >= block_end || tmp > block_end || tmp < start)
|
||||
if (ul > (size_t) (block_end - start))
|
||||
{
|
||||
printf (_(" DW_CFA_expression: <corrupt len %lu>\n"), ul);
|
||||
break;
|
||||
|
|
@ -9367,16 +9372,15 @@ display_debug_frames (struct dwarf_section *section,
|
|||
}
|
||||
if (*reg_prefix == '\0')
|
||||
fc->col_type[reg] = DW_CFA_expression;
|
||||
start = tmp;
|
||||
start += ul;
|
||||
break;
|
||||
|
||||
case DW_CFA_val_expression:
|
||||
READ_ULEB (reg, start, end);
|
||||
READ_ULEB (ul, start, end);
|
||||
READ_ULEB (reg, start, block_end);
|
||||
READ_ULEB (ul, start, block_end);
|
||||
if (reg >= (unsigned int) fc->ncols)
|
||||
reg_prefix = bad_reg;
|
||||
tmp = start + ul;
|
||||
if (start >= block_end || tmp > block_end || tmp < start)
|
||||
if (ul > (size_t) (block_end - start))
|
||||
{
|
||||
printf (" DW_CFA_val_expression: <corrupt len %lu>\n", ul);
|
||||
break;
|
||||
|
|
@ -9391,12 +9395,12 @@ display_debug_frames (struct dwarf_section *section,
|
|||
}
|
||||
if (*reg_prefix == '\0')
|
||||
fc->col_type[reg] = DW_CFA_val_expression;
|
||||
start = tmp;
|
||||
start += ul;
|
||||
break;
|
||||
|
||||
case DW_CFA_offset_extended_sf:
|
||||
READ_ULEB (reg, start, end);
|
||||
READ_SLEB (l, start, end);
|
||||
READ_ULEB (reg, start, block_end);
|
||||
READ_SLEB (l, start, block_end);
|
||||
if (frame_need_space (fc, reg) < 0)
|
||||
reg_prefix = bad_reg;
|
||||
if (! do_debug_frames_interp || *reg_prefix != '\0')
|
||||
|
|
@ -9411,8 +9415,8 @@ display_debug_frames (struct dwarf_section *section,
|
|||
break;
|
||||
|
||||
case DW_CFA_val_offset_sf:
|
||||
READ_ULEB (reg, start, end);
|
||||
READ_SLEB (l, start, end);
|
||||
READ_ULEB (reg, start, block_end);
|
||||
READ_SLEB (l, start, block_end);
|
||||
if (frame_need_space (fc, reg) < 0)
|
||||
reg_prefix = bad_reg;
|
||||
if (! do_debug_frames_interp || *reg_prefix != '\0')
|
||||
|
|
@ -9427,8 +9431,8 @@ display_debug_frames (struct dwarf_section *section,
|
|||
break;
|
||||
|
||||
case DW_CFA_def_cfa_sf:
|
||||
READ_ULEB (fc->cfa_reg, start, end);
|
||||
READ_ULEB (fc->cfa_offset, start, end);
|
||||
READ_ULEB (fc->cfa_reg, start, block_end);
|
||||
READ_ULEB (fc->cfa_offset, start, block_end);
|
||||
fc->cfa_offset = fc->cfa_offset * fc->data_factor;
|
||||
fc->cfa_exp = 0;
|
||||
if (! do_debug_frames_interp)
|
||||
|
|
@ -9437,7 +9441,7 @@ display_debug_frames (struct dwarf_section *section,
|
|||
break;
|
||||
|
||||
case DW_CFA_def_cfa_offset_sf:
|
||||
READ_ULEB (fc->cfa_offset, start, end);
|
||||
READ_ULEB (fc->cfa_offset, start, block_end);
|
||||
fc->cfa_offset *= fc->data_factor;
|
||||
if (! do_debug_frames_interp)
|
||||
printf (" DW_CFA_def_cfa_offset_sf: %d\n", (int) fc->cfa_offset);
|
||||
|
|
@ -9462,14 +9466,14 @@ display_debug_frames (struct dwarf_section *section,
|
|||
break;
|
||||
|
||||
case DW_CFA_GNU_args_size:
|
||||
READ_ULEB (ul, start, end);
|
||||
READ_ULEB (ul, start, block_end);
|
||||
if (! do_debug_frames_interp)
|
||||
printf (" DW_CFA_GNU_args_size: %ld\n", ul);
|
||||
break;
|
||||
|
||||
case DW_CFA_GNU_negative_offset_extended:
|
||||
READ_ULEB (reg, start, end);
|
||||
READ_SLEB (l, start, end);
|
||||
READ_ULEB (reg, start, block_end);
|
||||
READ_SLEB (l, start, block_end);
|
||||
l = - l;
|
||||
if (frame_need_space (fc, reg) < 0)
|
||||
reg_prefix = bad_reg;
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue