Mmap interceptor new option, Write Exec runtime detector

Summary: Following-up the refactoring of mmap interceptors, adding a new common option to detect PROT_WRITE|PROT_EXEC pages request.

Patch by David CARLIER

Reviewers: vitalybuka, vsk

Reviewed By: vitalybuka

Subscribers: krytarowski, #sanitizers

Differential Revision: https://reviews.llvm.org/D44194

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@327696 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 26 insertions, 0 deletions

diff --git a/lib/sanitizer_common/sanitizer_common_libcdep.cc b/lib/sanitizer_common/sanitizer_common_libcdep.cc
index 5cdfbbb27..6ba6f62c1 100644
--- a/lib/sanitizer_common/sanitizer_common_libcdep.cc
+++ b/lib/sanitizer_common/sanitizer_common_libcdep.cc
@@ -81,6 +81,32 @@ void ReportErrorSummary(const char *error_type, const StackTrace *stack,
 #endif
 }
 
+void ReportMmapWriteExec() {
+  ScopedErrorReportLock l;
+
+  SanitizerCommonDecorator d;
+
+#if !SANITIZER_GO
+  BufferedStackTrace stack;
+  uptr top = 0;
+  uptr bottom = 0;
+  GET_CALLER_PC_BP_SP;
+  (void)sp;
+  bool fast = common_flags()->fast_unwind_on_fatal;
+  if (fast)
+    GetThreadStackTopAndBottom(false, &top, &bottom);
+  stack.Unwind(kStackTraceMax, pc, bp, nullptr, top, bottom, fast);
+#endif
+
+  Printf("%s", d.Warning());
+  Report("WARNING: %s: writable-executable page usage\n", SanitizerToolName);
+  Printf("%s", d.Default());
+#if !SANITIZER_GO
+  stack.Print();
+  ReportErrorSummary("w-and-x-usage", &stack);
+#endif
+}
+
 static void (*SoftRssLimitExceededCallback)(bool exceeded);
 void SetSoftRssLimitExceededCallback(void (*Callback)(bool exceeded)) {
   CHECK_EQ(SoftRssLimitExceededCallback, nullptr);