Revert "[asan] Fix vfork handling.", +1

Revert r354625, r354627 - multiple build failures.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@354629 91177308-0d34-0410-b5e6-96231b3b80d8

6 files changed, 0 insertions, 46 deletions

diff --git a/lib/hwasan/CMakeLists.txt b/lib/hwasan/CMakeLists.txt
index d64564412..7460abc54 100644
--- a/lib/hwasan/CMakeLists.txt
+++ b/lib/hwasan/CMakeLists.txt
@@ -6,7 +6,6 @@ set(HWASAN_RTL_SOURCES
   hwasan_allocator.cc
   hwasan_dynamic_shadow.cc
   hwasan_interceptors.cc
-  hwasan_interceptors_vfork.S
   hwasan_linux.cc
   hwasan_memintrinsics.cc
   hwasan_poisoning.cc
diff --git a/lib/hwasan/hwasan.cc b/lib/hwasan/hwasan.cc
index 3a87dea26..9c83f73bd 100644
--- a/lib/hwasan/hwasan.cc
+++ b/lib/hwasan/hwasan.cc
@@ -477,30 +477,6 @@ void __hwasan_handle_longjmp(const void *sp_dst) {
   TagMemory(sp, dst - sp, 0);
 }
 
-void __hwasan_handle_vfork(const void *sp_dst) {
-  uptr sp = (uptr)sp_dst;
-  Thread *t = GetCurrentThread();
-  CHECK(t);
-  uptr top = t->stack_top();
-  uptr bottom = t->stack_bottom();
-  static const uptr kMaxExpectedCleanupSize = 64 << 20;  // 64M
-  if (top == 0 || bottom == 0 || sp < bottom || sp >= top ||
-      sp - bottom > kMaxExpectedCleanupSize) {
-    Report(
-        "WARNING: HWASan is ignoring requested __hwasan_handle_vfork: "
-        "stack top: %zx; current %zx; bottom: %zx \n"
-        "False positive error reports may follow\n",
-        top, sp, bottom);
-    return;
-  }
-  TagMemory(bottom, sp - bottom, 0);
-}
-
-void *__hwasan_extra_spill_area() {
-  Thread *t = GetCurrentThread();
-  return &t->vfork_spill();
-}
-
 void __hwasan_print_memory_usage() {
   InternalScopedString s(kMemoryUsageBufferSize);
   HwasanFormatMemoryUsage(s);
diff --git a/lib/hwasan/hwasan_interceptors.cc b/lib/hwasan/hwasan_interceptors.cc
index 1884b3da3..baecb1e03 100644
--- a/lib/hwasan/hwasan_interceptors.cc
+++ b/lib/hwasan/hwasan_interceptors.cc
@@ -227,10 +227,6 @@ INTERCEPTOR(int, pthread_create, void *th, void *attr,
 }
 #endif
 
-#if HWASAN_WITH_INTERCEPTORS
-DEFINE_REAL(void, vfork);
-#endif
-
 static void BeforeFork() {
   StackDepotLockAll();
 }
@@ -270,7 +266,6 @@ void InitializeInterceptors() {
   INTERCEPT_FUNCTION(fork);
 
 #if HWASAN_WITH_INTERCEPTORS
-  __interception::GetRealFunctionAddress("vfork", (uptr *)&REAL(vfork), 0, 0);
 #if !defined(__aarch64__)
   INTERCEPT_FUNCTION(pthread_create);
 #endif
diff --git a/lib/hwasan/hwasan_interceptors_vfork.S b/lib/hwasan/hwasan_interceptors_vfork.S
deleted file mode 100644
index 54b4a78db..000000000
--- a/lib/hwasan/hwasan_interceptors_vfork.S
+++ /dev/null
@@ -1,7 +0,0 @@
-#define COMMON_INTERCEPTOR_SPILL_AREA __hwasan_extra_spill_area
-#define COMMON_INTERCEPTOR_HANDLE_VFORK __hwasan_handle_vfork
-#include "sanitizer_common/sanitizer_common_interceptors_vfork_aarch64.inc.S"
-
-#if defined(__linux__)
-.section        .note.GNU-stack,"",@progbits
-#endif
diff --git a/lib/hwasan/hwasan_interface_internal.h b/lib/hwasan/hwasan_interface_internal.h
index 1b025c923..c2ae66653 100644
--- a/lib/hwasan/hwasan_interface_internal.h
+++ b/lib/hwasan/hwasan_interface_internal.h
@@ -117,9 +117,6 @@ SANITIZER_INTERFACE_ATTRIBUTE
 void __hwasan_handle_longjmp(const void *sp_dst);
 
 SANITIZER_INTERFACE_ATTRIBUTE
-void __hwasan_handle_vfork(const void *sp_dst);
-
-SANITIZER_INTERFACE_ATTRIBUTE
 u16 __sanitizer_unaligned_load16(const uu16 *p);
 
 SANITIZER_INTERFACE_ATTRIBUTE
@@ -203,9 +200,6 @@ SANITIZER_INTERFACE_ATTRIBUTE
 void *__hwasan_memset(void *s, int c, uptr n);
 SANITIZER_INTERFACE_ATTRIBUTE
 void *__hwasan_memmove(void *dest, const void *src, uptr n);
-
-SANITIZER_INTERFACE_ATTRIBUTE
-void *__hwasan_extra_spill_area();
 }  // extern "C"
 
 #endif  // HWASAN_INTERFACE_INTERNAL_H
diff --git a/lib/hwasan/hwasan_thread.h b/lib/hwasan/hwasan_thread.h
index 6fa592bfa..9c45adec1 100644
--- a/lib/hwasan/hwasan_thread.h
+++ b/lib/hwasan/hwasan_thread.h
@@ -67,14 +67,11 @@ class Thread {
     Print("Thread: ");
   }
 
-  uptr &vfork_spill() { return vfork_spill_; }
-
  private:
   // NOTE: There is no Thread constructor. It is allocated
   // via mmap() and *must* be valid in zero-initialized state.
   void ClearShadowForThreadStackAndTLS();
   void Print(const char *prefix);
-  uptr vfork_spill_;
   uptr stack_top_;
   uptr stack_bottom_;
   uptr tls_begin_;