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Small update to datacmp and roadmap (#1048)

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* Match uninit variables with all nulls

* Enable _pnhHeap variable for ISLE

* Roadmap bugfix for ordinal import dummy addrs

* Format fix
This commit is contained in:
MS
2024-06-28 17:58:35 -04:00
committed by GitHub
parent 6e39e87613
commit 4a87c3bc44
3 changed files with 26 additions and 14 deletions
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34
tools/datacmp.py
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@@ -188,24 +188,33 @@ def do_the_comparison(args: argparse.Namespace) -> Iterable[ComparisonItem]:
orig_raw = origfile.read(var.orig_addr, data_size)
recomp_raw = recompfile.read(var.recomp_addr, data_size)
# If either read exceeded the raw data size for the section,
# assume the entire variable is uninitialized.
# TODO: This is not correct, strictly speaking. However,
# it is probably impossible for a variable to exceed
# the virtual size of the section, so all that is left is
# the uninitialized data.
# If the variable falls at the end of the section like this,
# it is highly likely to be uninitialized.
# The IMAGE_SECTION_HEADER defines the SizeOfRawData and VirtualSize for the section.
# If VirtualSize > SizeOfRawData, the section is comprised of the initialized data
# corresponding to bytes in the file, and the rest is padded with zeroes when
# Windows loads the image.
# The linker might place variables initialized to zero on the threshold between
# physical data and the virtual (uninitialized) data.
# If this happens (i.e. we get an incomplete read) we just do the same padding
# to prepare for the comparison.
if orig_raw is not None and len(orig_raw) < data_size:
orig_raw = None
orig_raw = orig_raw.ljust(data_size, b"\x00")
if recomp_raw is not None and len(recomp_raw) < data_size:
recomp_raw = None
recomp_raw = recomp_raw.ljust(data_size, b"\x00")
# If both variables are uninitialized, we consider them equal.
# Otherwise, this is a diff but there is nothing to compare.
# If one or both variables are entirely uninitialized
if orig_raw is None or recomp_raw is None:
# If both variables are uninitialized, we consider them equal.
match = orig_raw is None and recomp_raw is None
# We can match a variable initialized to all zeroes with
# an uninitialized variable, but this may or may not actually
# be correct, so we flag it for the user.
uninit_force_match = not match and (
(orig_raw is None and all(b == 0 for b in recomp_raw))
or (recomp_raw is None and all(b == 0 for b in orig_raw))
)
orig_value = "(uninitialized)" if orig_raw is None else "(initialized)"
recomp_value = (
"(uninitialized)" if recomp_raw is None else "(initialized)"
@@ -220,6 +229,7 @@ def do_the_comparison(args: argparse.Namespace) -> Iterable[ComparisonItem]:
values=(orig_value, recomp_value),
)
],
raw_only=uninit_force_match,
)
continue