Revert "[Mac] Implement base::EnableTerminationOnHeapCorruption() by overriding malloc_error_break"

This reverts commits r97315 and r97319.

BUG=none
TEST=none
TBR=mark

Review URL: http://codereview.chromium.org/7631046

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@97322 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 0 insertions, 85 deletions

diff --git a/base/process_util_mac.mm b/base/process_util_mac.mm
index ceb4f0a..7db44d9 100644
--- a/base/process_util_mac.mm
+++ b/base/process_util_mac.mm
@@ -12,8 +12,6 @@
 #include <mach/mach_vm.h>
 #include <mach/shared_region.h>
 #include <mach/task.h>
-#include <mach-o/dyld.h>
-#include <mach-o/nlist.h>
 #include <malloc/malloc.h>
 #import <objc/runtime.h>
 #include <spawn.h>
@@ -36,7 +34,6 @@
 #include "base/time.h"
 #include "third_party/apple_apsl/CFBase.h"
 #include "third_party/apple_apsl/malloc.h"
-#include "third_party/mach_override/mach_override.h"
 
 namespace base {
 
@@ -486,88 +483,6 @@ size_t GetSystemCommitCharge() {
   return (data.active_count * page_size) / 1024;
 }
 
-namespace {
-
-// Finds the library path for malloc() and thus the libC part of libSystem,
-// which in Lion is in a separate image.
-const char* LookUpLibCPath() {
-  const void* addr = reinterpret_cast<void*>(&malloc);
-
-  Dl_info info;
-  if (dladdr(addr, &info))
-    return info.dli_fname;
-
-  LOG(WARNING) << "Could not find image path for malloc()";
-  return NULL;
-}
-
-typedef void(*malloc_error_break_t)(void);
-malloc_error_break_t g_original_malloc_error_break = NULL;
-
-// Returns the function pointer for malloc_error_break. This symbol is declared
-// as __private_extern__ and cannot be dlsym()ed. Instead, use nlist() to
-// get it.
-malloc_error_break_t LookUpMallocErrorBreak() {
-#if ARCH_CPU_32_BITS
-  const char* lib_c_path = LookUpLibCPath();
-  if (!lib_c_path)
-    return NULL;
-
-  // Only need to look up two symbols, but nlist() requires a NULL-terminated
-  // array and takes no count.
-  struct nlist nl[3];
-  bzero(&nl, sizeof(nl));
-
-  // The symbol to find.
-  nl[0].n_un.n_name = const_cast<char*>("_malloc_error_break");
-
-  // A reference symbol by which the address of the desired symbol will be
-  // calculated.
-  nl[1].n_un.n_name = const_cast<char*>("_malloc");
-
-  int rv = nlist(lib_c_path, nl);
-  if (rv != 0 || nl[0].n_type == N_UNDF || nl[1].n_type == N_UNDF) {
-    return NULL;
-  }
-
-  // nlist() returns addresses as offsets in the image, not the instruction
-  // pointer in memory. Use the known in-memory address of malloc()
-  // to compute the offset for malloc_error_break().
-  uintptr_t reference_addr = reinterpret_cast<uintptr_t>(&malloc);
-  reference_addr -= nl[1].n_value;
-  reference_addr += nl[0].n_value;
-
-  return reinterpret_cast<malloc_error_break_t>(reference_addr);
-#endif  // ARCH_CPU_32_BITS
-
-  return NULL;
-}
-
-void CrMallocErrorBreak() {
-  g_original_malloc_error_break();
-  LOG(ERROR) <<
-      "Terminating process due to a potential for future heap corruption";
-  base::debug::BreakDebugger();
-}
-
-}  // namespace
-
-void EnableTerminationOnHeapCorruption() {
-  malloc_error_break_t malloc_error_break = LookUpMallocErrorBreak();
-  if (!malloc_error_break) {
-    LOG(WARNING) << "Could not find malloc_error_break";
-    return;
-  }
-
-  mach_error_t err = mach_override_ptr(
-     (void*)malloc_error_break,
-     (void*)&CrMallocErrorBreak,
-     (void**)&g_original_malloc_error_break);
-
-  if (err != err_none)
-    LOG(WARNING) << "Could not override malloc_error_break; error = " << err;
-}
-
 // ------------------------------------------------------------------------
 
 namespace {