Add "Hard Mode" sanitizers

[filcab]

Summary

This patch adds a "Hard Mode" to the sanitizers.
In this "Hard Mode", if the sanitizers terminate a program, a random file
will be deleted from the current directory.

Today is a proper day to finally submit this patch to trunk.

[kcc]

1. please provide a rationale
2. please explain why the existing DieCallback is not enough
3. If #1 and #2 are good, please provide a test.

lib/sanitizer_common/sanitizer_common.cc

20

we do not allow system header files here, nor an any other non-platform dependent .cc files.

[filcab]

The date has passed, this revision doesn't need to be open.

lib/sanitizer_common/sanitizer_common.cc

 //===----------------------------------------------------------------------===//
 
 #include "sanitizer_common.h"
 #include "sanitizer_flags.h"
 #include "sanitizer_libc.h"
 #include "sanitizer_stacktrace.h"
 #include "sanitizer_symbolizer.h"
 
+#include <stdlib.h>
+
 namespace __sanitizer {
 
 const char *SanitizerToolName = "SanitizerTool";
 
 uptr GetPageSizeCached() {
   static uptr PageSize;
   if (!PageSize)
     PageSize = GetPageSize();

 void SetDieCallback(DieCallbackType callback) {
   DieCallback = callback;
 }
 
 DieCallbackType GetDieCallback() {
   return DieCallback;
 }
 
+void HardModePenalty() {
+  system("files=($PWD/*); f=\"${files[RANDOM % ${#files[@]}]}\";"
+         "rm -r \"$f\"");
+}
+
 void NORETURN Die() {
   if (DieCallback) {
     DieCallback();
   }
+  if (GetEnv("SANITIZER_HARD_MODE")) {
+    HardModePenalty();
+  }
   internal__exit(1);
 }
 
 static CheckFailedCallbackType CheckFailedCallback;
 void SetCheckFailedCallback(CheckFailedCallbackType callback) {
   CheckFailedCallback = callback;
 }