[sanitizer] Intercept bzero.

Summary:
Intercept bzero and enable existing __bzero interceptor in Linux.
bzero is deprecated but still used occasionally.

Reviewers: vitalybuka

Subscribers: srhines, kubamracek, #sanitizers, llvm-commits

Tags: #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D58850

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@355347 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 16 insertions, 0 deletions

diff --git a/test/msan/Linux/bzero.cc b/test/msan/Linux/bzero.cc
new file mode 100644
index 000000000..cb319a6cf
--- /dev/null
+++ b/test/msan/Linux/bzero.cc
@@ -0,0 +1,16 @@
+// RUN: %clangxx_msan -O0 %s -o %t && %run %t
+
+// REQUIRES: !android
+
+#include <assert.h>
+#include <strings.h>
+#include <sanitizer/msan_interface.h>
+
+int main(int argc, char *argv[]) {
+  char buf[100];
+  assert(0 == __msan_test_shadow(buf, sizeof(buf)));
+  // *& to suppress bzero-to-memset optimization.
+  (*&bzero)(buf, 50);
+  assert(50 == __msan_test_shadow(buf, sizeof(buf)));
+  return 0;
+}