From 9c790e8abc177dee14e192c982c911f37b9653e7 Mon Sep 17 00:00:00 2001
From: Renato Golin <renato.golin@linaro.org>
Date: Mon, 5 Jun 2017 07:36:02 +0000
Subject: Revert "[sanitizer-coverage] test for
 -fsanitize-coverage=inline-8bit-counters"

Revert "Mark sancov test as unsupported on Darwin"
Revert "[LSan] Detect dynamic loader by its base address."

This reverts commit r304633.
This reverts commit r304673.
This reverts commit r304632.

Those commit have broken LOTS of ARM/AArch64 bots for two days.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@304699 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/lsan/lsan_common.cc       |  3 ---
 lib/lsan/lsan_common_linux.cc | 23 ++++++-----------------
 2 files changed, 6 insertions(+), 20 deletions(-)

(limited to 'lib/lsan')

diff --git a/lib/lsan/lsan_common.cc b/lib/lsan/lsan_common.cc
index d4f670681..a5ffc6835 100644
--- a/lib/lsan/lsan_common.cc
+++ b/lib/lsan/lsan_common.cc
@@ -408,9 +408,6 @@ static void MarkInvalidPCCb(uptr chunk, void *arg) {
 
 // On Linux, handles dynamically allocated TLS blocks by treating all chunks
 // allocated from ld-linux.so as reachable.
-// On Linux, treats all chunks allocated from ld-linux.so as reachable, which
-// covers dynamically allocated TLS blocks, internal dynamic loader's loaded
-// modules accounting etc.
 // Dynamic TLS blocks contain the TLS variables of dynamically loaded modules.
 // They are allocated with a __libc_memalign() call in allocate_and_init()
 // (elf/dl-tls.c). Glibc won't tell us the address ranges occupied by those
diff --git a/lib/lsan/lsan_common_linux.cc b/lib/lsan/lsan_common_linux.cc
index 2e4095b49..c903be42d 100644
--- a/lib/lsan/lsan_common_linux.cc
+++ b/lib/lsan/lsan_common_linux.cc
@@ -23,10 +23,6 @@
 #include "sanitizer_common/sanitizer_linux.h"
 #include "sanitizer_common/sanitizer_stackdepot.h"
 
-#if SANITIZER_USE_GETAUXVAL
-#include <sys/auxv.h>
-#endif  // SANITIZER_USE_GETAUXVAL
-
 namespace __lsan {
 
 static const char kLinkerName[] = "ld";
@@ -34,12 +30,8 @@ static const char kLinkerName[] = "ld";
 static char linker_placeholder[sizeof(LoadedModule)] ALIGNED(64);
 static LoadedModule *linker = nullptr;
 
-static bool IsLinker(const LoadedModule& module) {
-#if SANITIZER_USE_GETAUXVAL
-  return module.base_address() == getauxval(AT_BASE);
-#else
-  return LibraryNameIs(module.full_name(), kLinkerName);
-#endif  // SANITIZER_USE_GETAUXVAL
+static bool IsLinker(const char* full_name) {
+  return LibraryNameIs(full_name, kLinkerName);
 }
 
 __attribute__((tls_model("initial-exec")))
@@ -57,25 +49,22 @@ void InitializePlatformSpecificModules() {
   ListOfModules modules;
   modules.init();
   for (LoadedModule &module : modules) {
-    if (!IsLinker(module))
-      continue;
+    if (!IsLinker(module.full_name())) continue;
     if (linker == nullptr) {
       linker = reinterpret_cast<LoadedModule *>(linker_placeholder);
       *linker = module;
       module = LoadedModule();
     } else {
       VReport(1, "LeakSanitizer: Multiple modules match \"%s\". "
-                 "TLS and other allocations originating from linker might be "
-                 "falsely reported as leaks.\n", kLinkerName);
+              "TLS will not be handled correctly.\n", kLinkerName);
       linker->clear();
       linker = nullptr;
       return;
     }
   }
   if (linker == nullptr) {
-    VReport(1, "LeakSanitizer: Dynamic linker not found. TLS and other "
-               "allocations originating from linker might be falsely reported "
-                "as leaks.\n");
+    VReport(1, "LeakSanitizer: Dynamic linker not found. "
+               "TLS will not be handled correctly.\n");
   }
 }
 
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