win: Validate readability of memory ranges added to minidump

util/win/process_info.cc

 // Copyright 2015 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 582 matching lines @@
   INITIALIZATION_STATE_DCHECK_VALID(initialized_);
   return memory_info_;
 }
 
 std::vector<CheckedRange<WinVMAddress, WinVMSize>>
 ProcessInfo::GetReadableRanges(
     const CheckedRange<WinVMAddress, WinVMSize>& range) const {
   return GetReadableRangesOfMemoryMap(range, MemoryInfo());
 }
 
+bool ProcessInfo::LoggingRangeIsFullyReadable(
+    const CheckedRange<WinVMAddress, WinVMSize>& range) const {
+  const auto ranges = GetReadableRanges(range);
+  if (ranges.size() != 1) {
+    LOG(ERROR) << base::StringPrintf(
+        "range at 0x%llx, size 0x%llx fully unreadable",
+        range.base(),
+        range.size());
+    return false;
+  }
+  if (ranges[0].base() != range.base() || ranges[0].size() != range.size()) {
+    LOG(ERROR) << base::StringPrintf(
+        "some of range at 0x%llx, size 0x%llx unreadable",
+        range.base(),
+        range.size());
+    return false;
+  }
+  return true;
+}
+
 const std::vector<ProcessInfo::Handle>& ProcessInfo::Handles() const {
   INITIALIZATION_STATE_DCHECK_VALID(initialized_);
   if (handles_.empty())
     handles_ = BuildHandleVector(process_);
   return handles_;
 }
 
 std::vector<CheckedRange<WinVMAddress, WinVMSize>> GetReadableRangesOfMemoryMap(
     const CheckedRange<WinVMAddress, WinVMSize>& range,
     const std::vector<MEMORY_BASIC_INFORMATION64>& memory_info) {
@@ skipping 50 matching lines @@
     } else {
       result.push_back(as_ranges[i]);
     }
     DCHECK(result.back().IsValid());
   }
 
   return result;
 }
 
 }  // namespace crashpad