Add memory safety verification test suite for security/deflate

deflate/deflate_memory_safety_test.cc

@@ -0,0 +1,138 @@
+#include <string>
+#include <utility>
+
+#include "flate2.h"
+#include "gzip_wrapper.h"
+#include "testing/base/public/gmock.h"
+#include "testing/base/public/gunit.h"
+#include "absl/log/check.h"
+#include "absl/status/status.h"
+#include "absl/strings/cord.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
+
+namespace security::deflate {
+namespace {
+
+std::string CreateSampleCompressedGzip() {
+  std::string input =
+      absl::StrCat("Hello FFI Memory Safety! ", std::string(200, 'X'));
+  auto wrapper = CompressGzip(input, 6);
+  CHECK_OK(wrapper.status());
+  return std::string(std::move(wrapper).value().as_string_view());
+}
+
+// ============================================================================
+// PROOFS OF ABSENCE: Baseline Safe Lifecycle Invariants (Enabled)
+// ============================================================================
+
+TEST(DeflateMemorySafetyTest, Proof_Of_Absence_Lvalue_VecU8Wrapper_Safe) {
+  std::string compressed = CreateSampleCompressedGzip();
+  ASSERT_OK_AND_ASSIGN(VecU8Wrapper decompressed_wrapper,
+                       UncompressGzip(compressed));
+
+  absl::string_view view = decompressed_wrapper.as_string_view();
+  EXPECT_FALSE(view.empty());
+  EXPECT_THAT(view, testing::StartsWith("Hello FFI Memory Safety!"));
+}
+
+TEST(DeflateMemorySafetyTest, Proof_Of_Absence_Rvalue_Cord_Extraction_Safe) {
+  std::string compressed = CreateSampleCompressedGzip();
+  ASSERT_OK_AND_ASSIGN(VecU8Wrapper decompressed_wrapper,
+                       UncompressGzip(compressed));
+
+  absl::Cord cord = std::move(decompressed_wrapper).as_cord();
+  EXPECT_FALSE(cord.empty());
+  EXPECT_THAT(std::string(cord),
+              testing::StartsWith("Hello FFI Memory Safety!"));
+}
+
+TEST(DeflateMemorySafetyTest, Proof_Of_Absence_ReadDecoder_Lvalue_Safe) {
+  std::string compressed = CreateSampleCompressedGzip();
+  auto decoder = read::GzDecoder::create(compressed);
+  ASSERT_OK_AND_ASSIGN(VecU8Wrapper wrapper, decoder.read_to_end());
+
+  absl::string_view view = wrapper.as_string_view();
+  EXPECT_FALSE(view.empty());
+  EXPECT_THAT(view, testing::StartsWith("Hello FFI Memory Safety!"));
+}
+
+// ============================================================================
+// PASS 1: REPRODUCIBLE MEMORY SAFETY HAZARDS (Disabled Under Baseline CI)
+// ============================================================================
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wreturn-stack-address"
+#pragma clang diagnostic ignored "-Wdangling-gsl"
+
+TEST(DeflateMemorySafetyTest,
+     DISABLED_Hazard_H3_UncompressGzip_TemporaryChaining_UAF) {
+  std::string compressed = CreateSampleCompressedGzip();
+
+  absl::string_view dangling_view;
+  {
+    auto get_chained_view = [&]() -> absl::string_view {
+      return UncompressGzip(compressed)->as_string_view();
+    };
+    dangling_view = get_chained_view();
+  }
+
+  volatile char c = dangling_view[0];
+  (void)c;
+}
+
+TEST(DeflateMemorySafetyTest,
+     DISABLED_Hazard_H3_CompressGzip_TemporaryChaining_UAF) {
+  std::string input = "Temporary Chaining Compress Hazard Payload";
+
+  absl::string_view dangling_view;
+  {
+    auto get_chained_view = [&]() -> absl::string_view {
+      return CompressGzip(input, 6)->as_string_view();
+    };
+    dangling_view = get_chained_view();
+  }
+
+  volatile char c = dangling_view[0];
+  (void)c;
+}
+
+TEST(DeflateMemorySafetyTest,
+     DISABLED_Hazard_H3_ReadGzDecoder_TemporaryChaining_UAF) {
+  std::string compressed = CreateSampleCompressedGzip();
+  auto decoder = read::GzDecoder::create(compressed);
+
+  absl::string_view dangling_view;
+  {
+    auto get_chained_view = [&]() -> absl::string_view {
+      return decoder.read_to_end()->as_string_view();
+    };
+    dangling_view = get_chained_view();
+  }
+
+  volatile char c = dangling_view[0];
+  (void)c;
+}
+
+TEST(DeflateMemorySafetyTest,
+     DISABLED_Hazard_H3_WriteGzEncoder_Finish_TemporaryChaining_UAF) {
+  std::string input = "Write GzEncoder Finish Chaining Hazard";
+  auto encoder = write::GzEncoder::create(Compression::best());
+  ASSERT_OK(encoder.write_all(input));
+
+  absl::string_view dangling_view;
+  {
+    auto get_chained_view = [&]() -> absl::string_view {
+      return std::move(encoder).finish()->as_string_view();
+    };
+    dangling_view = get_chained_view();
+  }
+
+  volatile char c = dangling_view[0];
+  (void)c;
+}
+
+#pragma clang diagnostic pop
+
+}  // namespace
+}  // namespace security::deflate