[tracing] Sanitize process memory dumps for background mode

base/trace_event/memory_infra_background_whitelist.cc

Index: base/trace_event/memory_infra_background_whitelist.cc
diff --git a/base/trace_event/memory_infra_background_whitelist.cc b/base/trace_event/memory_infra_background_whitelist.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9e60234b583c1f584e89d03956d4d26af531f7a5
--- /dev/null
+++ b/base/trace_event/memory_infra_background_whitelist.cc
@@ -0,0 +1,75 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/trace_event/memory_infra_background_whitelist.h"
+
+#include <ctype.h>
+#include <string.h>
+
+#include <string>
+
+namespace base {
+namespace trace_event {
+
+namespace {
+const char* const* g_dump_provider_whitelist_for_testing = nullptr;

[Primiano Tucci (use gerrit), 2016/06/02 20:24:04]

Probably a bit more maintainable if you:
- Just call this g_dump_provider_whitelist
- instead of nullptr set this to be non-const and = kDumpProviderWhitelist.
- In the set...fortesting you just reset the g_dump_provider_whitelist

So you don't have to remember to do the conditional below

[ssid, 2016/06/03 01:59:46]

Thanks, done

+const char* const* g_allocator_dump_name_whitelist_for_tetsting = nullptr;
+}
+
+bool IsMemoryDumpProviderWhitelisted(const char* mdp_name) {
+  const char* const* whitelist = g_dump_provider_whitelist_for_testing
+                                     ? g_dump_provider_whitelist_for_testing
+                                     : kDumpProviderWhitelist;
+  for (size_t i = 0; whitelist[i] != nullptr; ++i) {
+    if (strcmp(mdp_name, whitelist[i]) == 0)
+      return true;
+  }
+  return false;
+}
+
+bool IsMemoryAllocatorDumpNameWhitelisted(const std::string& mad_name) {

[Primiano Tucci (use gerrit), 2016/06/02 20:24:04]

just |name| should be fine here. It's quite funny to read "mad_name", as in
"crazy_name" :)

[ssid, 2016/06/03 01:59:46]

haha done.

+  // Remove special characters, numbers (including hexadecimal which are marked
+  // by '0x') from the given string.
+  const size_t length = mad_name.size();
+  std::string stripped_str;
+  stripped_str.reserve(length);
+  bool parsing_hex = false;
+  for (size_t i = 0; i < length; ++i) {
+    if (parsing_hex) {
+      if (isxdigit(mad_name[i])) {
+        continue;
+      } else {
+        parsing_hex = false;
+      }
+    }
+    if (i + 1 < length && mad_name[i] == '0' && mad_name[i + 1] == 'x') {
+      parsing_hex = true;
+      ++i;
+    } else if (isalpha(mad_name[i])) {
+      stripped_str.push_back(mad_name[i]);
+    }
+  }
+
+  const char* const* whitelist =
+      g_allocator_dump_name_whitelist_for_tetsting
+          ? g_allocator_dump_name_whitelist_for_tetsting
+          : kAllocatorDumpNameWhitelist;
+  for (size_t i = 0; whitelist[i] != nullptr; ++i) {
+    if (stripped_str == whitelist[i]) {
+      return true;
+    }
+  }
+  return false;
+}
+
+void SetDumpProviderWhitelistForTesting(const char* const* list) {
+  g_dump_provider_whitelist_for_testing = list;
+}
+
+void SetAllocatorDumpNameWhitelistForTesting(const char* const* list) {
+  g_allocator_dump_name_whitelist_for_tetsting = list;
+}
+
+}  // namespace trace_event
+}  // namespace base