[msan] Intercept __getrlimit.

Summary:
This interceptor is useful on its own, but the main purpose of this
change is to intercept libpthread initialization on linux/glibc in
order to run __msan_init before any .preinit_array constructors.

We used to trigger on pthread_initialize_minimal -> getrlimit(), but
that call has changed to __getrlimit at some point.

Reviewers: vitalybuka, pcc

Subscribers: jfb, #sanitizers, llvm-commits

Tags: #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D68168

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@373239 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 16 insertions, 0 deletions

diff --git a/test/msan/preinit_array.cpp b/test/msan/preinit_array.cpp
new file mode 100644
index 000000000..6f877bac0
--- /dev/null
+++ b/test/msan/preinit_array.cpp
@@ -0,0 +1,16 @@
+// RUN: %clangxx_msan -O0 %s -o %t && %run %t
+
+#include <sanitizer/msan_interface.h>
+
+volatile int global;
+static void pre_ctor() {
+  volatile int local;
+  global = 42;
+  local = 42;
+}
+
+__attribute__((section(".preinit_array"), used)) void(*__local_pre_ctor)(void) = pre_ctor;
+
+int main(void) {
+  return 0;
+}