From 16dfa3fc2f2ac2a3ec23e61a448c8595397ffbaf Mon Sep 17 00:00:00 2001
From: Kamil Rytarowski <n54@gmx.com>
Date: Sat, 21 Sep 2019 07:45:02 +0000
Subject: Add __lsan::ScopedInterceptorDisabler for strerror(3)

Summary:
strerror(3) on NetBSD uses internally TSD with a destructor that is never
fired for exit(3). It's correctly called for pthread_exit(3) scenarios.

This is a case when a leak on exit(3) is expected, unavoidable and harmless.

Reviewers: joerg, vitalybuka, dvyukov, mgorny

Reviewed By: vitalybuka

Subscribers: dmgreen, kristof.beyls, jfb, llvm-commits, #sanitizers

Tags: #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D67337

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@372461 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/asan/asan_interceptors.cpp                         |  5 +++++
 lib/lsan/lsan_interceptors.cpp                         | 12 ++++++++++++
 lib/sanitizer_common/sanitizer_common_interceptors.inc |  6 ++++++
 3 files changed, 23 insertions(+)

diff --git a/lib/asan/asan_interceptors.cpp b/lib/asan/asan_interceptors.cpp
index ec9589338..e43a42736 100644
--- a/lib/asan/asan_interceptors.cpp
+++ b/lib/asan/asan_interceptors.cpp
@@ -164,6 +164,11 @@ DECLARE_REAL_AND_INTERCEPTOR(void, free, void *)
     ASAN_MEMSET_IMPL(ctx, block, c, size);                  \
   } while (false)
 
+#if CAN_SANITIZE_LEAKS
+#define COMMON_INTERCEPTOR_STRERROR()                       \
+  __lsan::ScopedInterceptorDisabler disabler
+#endif
+
 #include "sanitizer_common/sanitizer_common_interceptors.inc"
 #include "sanitizer_common/sanitizer_signal_interceptors.inc"
 
diff --git a/lib/lsan/lsan_interceptors.cpp b/lib/lsan/lsan_interceptors.cpp
index 84a6acda4..601a5efe9 100644
--- a/lib/lsan/lsan_interceptors.cpp
+++ b/lib/lsan/lsan_interceptors.cpp
@@ -383,6 +383,16 @@ INTERCEPTOR(int, pthread_atfork, void (*prepare)(), void (*parent)(),
 #define LSAN_MAYBE_INTERCEPT_PTHREAD_ATFORK
 #endif
 
+#if SANITIZER_INTERCEPT_STRERROR
+INTERCEPTOR(char *, strerror, int errnum) {
+  __lsan::ScopedInterceptorDisabler disabler;
+  return REAL(strerror)(errnum);
+}
+#define LSAN_MAYBE_INTERCEPT_STRERROR INTERCEPT_FUNCTION(strerror)
+#else
+#define LSAN_MAYBE_INTERCEPT_STRERROR
+#endif
+
 struct ThreadParam {
   void *(*callback)(void *arg);
   void *param;
@@ -496,6 +506,8 @@ void InitializeInterceptors() {
   LSAN_MAYBE_INTERCEPT_ATEXIT;
   LSAN_MAYBE_INTERCEPT_PTHREAD_ATFORK;
 
+  LSAN_MAYBE_INTERCEPT_STRERROR;
+
 #if !SANITIZER_NETBSD && !SANITIZER_FREEBSD
   if (pthread_key_create(&g_thread_finalize_key, &thread_finalize)) {
     Report("LeakSanitizer: failed to create thread key.\n");
diff --git a/lib/sanitizer_common/sanitizer_common_interceptors.inc b/lib/sanitizer_common/sanitizer_common_interceptors.inc
index 7ea896ef2..587b1ea22 100644
--- a/lib/sanitizer_common/sanitizer_common_interceptors.inc
+++ b/lib/sanitizer_common/sanitizer_common_interceptors.inc
@@ -36,6 +36,7 @@
 //   COMMON_INTERCEPTOR_MMAP_IMPL
 //   COMMON_INTERCEPTOR_COPY_STRING
 //   COMMON_INTERCEPTOR_STRNDUP_IMPL
+//   COMMON_INTERCEPTOR_STRERROR
 //===----------------------------------------------------------------------===//
 
 #include "interception/interception.h"
@@ -301,6 +302,10 @@ bool PlatformHasDifferentMemcpyAndMemmove();
   return new_mem;
 #endif
 
+#ifndef COMMON_INTERCEPTOR_STRERROR
+#define COMMON_INTERCEPTOR_STRERROR() {}
+#endif
+
 struct FileMetadata {
   // For open_memstream().
   char **addr;
@@ -3677,6 +3682,7 @@ INTERCEPTOR(int, sched_getparam, int pid, void *param) {
 INTERCEPTOR(char *, strerror, int errnum) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, strerror, errnum);
+  COMMON_INTERCEPTOR_STRERROR();
   char *res = REAL(strerror)(errnum);
   if (res) COMMON_INTERCEPTOR_INITIALIZE_RANGE(res, REAL(strlen)(res) + 1);
   return res;
-- 
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