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| author | Nick Clifton <nickc@redhat.com> | 2014-12-09 12:42:18 +0000 |
|---|---|---|
| committer | Nick Clifton <nickc@redhat.com> | 2014-12-09 12:42:18 +0000 |
| commit | f64e188b58f4aab4cbd03aa6e9fc1aa602546e26 (patch) | |
| tree | 46d8f90891842ce15eee893ce5489835e9e65a20 /bfd/elf-attrs.c | |
| parent | 137d1369ac054744d27f19e95aa8a739e6c0068d (diff) | |
| download | gdb-f64e188b58f4aab4cbd03aa6e9fc1aa602546e26.zip gdb-f64e188b58f4aab4cbd03aa6e9fc1aa602546e26.tar.gz gdb-f64e188b58f4aab4cbd03aa6e9fc1aa602546e26.tar.bz2 | |
More fixes for memory access violations triggered by fuzzed binaries.
PR binutils/17512
* objdump.c (display_any_bfd): Avoid infinite loop closing and
opening the same archive again and again.
* archive64.c (bfd_elf64_archive_slurp_armap): Add range checks.
* libbfd.c (safe_read_leb128): New function.
* libbfd-in.h (safe_read_leb128): Add prototype.
* libbfd.h: Regenerate.
* elf-attrs.c (_bfd_elf_parse_attributes): Use safe_read_leb128.
Check for an over-long subsection length.
* elf.c (elf_parse_notes): Check that the namedata is long enough
for the string comparison that is about to be performed.
(elf_read_notes): Zero-terminate the note buffer.
Diffstat (limited to 'bfd/elf-attrs.c')
| -rw-r--r-- | bfd/elf-attrs.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/bfd/elf-attrs.c b/bfd/elf-attrs.c index 25f7e26..8f76b6a 100644 --- a/bfd/elf-attrs.c +++ b/bfd/elf-attrs.c @@ -492,7 +492,7 @@ _bfd_elf_parse_attributes (bfd *abfd, Elf_Internal_Shdr * hdr) bfd_vma subsection_len; bfd_byte *end; - tag = read_unsigned_leb128 (abfd, p, &n); + tag = safe_read_leb128 (abfd, p, &n, FALSE, p_end); p += n; if (p < p_end - 4) subsection_len = bfd_get_32 (abfd, p); @@ -506,6 +506,9 @@ _bfd_elf_parse_attributes (bfd *abfd, Elf_Internal_Shdr * hdr) section_len -= subsection_len; subsection_len -= n + 4; end = p + subsection_len; + /* PR 17512: file: 0e8c0c90. */ + if (end > p_end) + end = p_end; switch (tag) { case Tag_File: @@ -513,25 +516,25 @@ _bfd_elf_parse_attributes (bfd *abfd, Elf_Internal_Shdr * hdr) { int type; - tag = read_unsigned_leb128 (abfd, p, &n); + tag = safe_read_leb128 (abfd, p, &n, FALSE, end); p += n; type = _bfd_elf_obj_attrs_arg_type (abfd, vendor, tag); switch (type & (ATTR_TYPE_FLAG_INT_VAL | ATTR_TYPE_FLAG_STR_VAL)) { case ATTR_TYPE_FLAG_INT_VAL | ATTR_TYPE_FLAG_STR_VAL: - val = read_unsigned_leb128 (abfd, p, &n); + val = safe_read_leb128 (abfd, p, &n, FALSE, end); p += n; bfd_elf_add_obj_attr_int_string (abfd, vendor, tag, - val, (char *)p); + val, (char *) p); p += strlen ((char *)p) + 1; break; case ATTR_TYPE_FLAG_STR_VAL: bfd_elf_add_obj_attr_string (abfd, vendor, tag, - (char *)p); + (char *) p); p += strlen ((char *)p) + 1; break; case ATTR_TYPE_FLAG_INT_VAL: - val = read_unsigned_leb128 (abfd, p, &n); + val = safe_read_leb128 (abfd, p, &n, FALSE, end); p += n; bfd_elf_add_obj_attr_int (abfd, vendor, tag, val); break; |