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Environment.cpp
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/*
* Copyright (C) 2014 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "BPlatform.h"
#include "Environment.h"
#include "ProcessCheck.h"
#include <cstdlib>
#include <cstring>
#if BOS(DARWIN)
#include <mach-o/dyld.h>
#elif BOS(UNIX)
#include <dlfcn.h>
#endif
#if BPLATFORM(IOS_FAMILY) && !BPLATFORM(MACCATALYST) && !BPLATFORM(IOS_FAMILY_SIMULATOR)
#define BUSE_CHECK_NANO_MALLOC 1
#else
#define BUSE_CHECK_NANO_MALLOC 0
#endif
#if BUSE(CHECK_NANO_MALLOC)
extern "C" {
#if __has_include(<malloc_private.h>)
#include <malloc_private.h>
#endif
int malloc_engaged_nano(void);
}
#endif
namespace bmalloc {
static bool isMallocEnvironmentVariableSet()
{
const char* list[] = {
"Malloc",
"MallocLogFile",
"MallocGuardEdges",
"MallocDoNotProtectPrelude",
"MallocDoNotProtectPostlude",
"MallocStackLogging",
"MallocStackLoggingNoCompact",
"MallocStackLoggingDirectory",
"MallocScribble",
"MallocCheckHeapStart",
"MallocCheckHeapEach",
"MallocCheckHeapSleep",
"MallocCheckHeapAbort",
"MallocErrorAbort",
"MallocCorruptionAbort",
"MallocHelp"
};
size_t size = sizeof(list) / sizeof(const char*);
for (size_t i = 0; i < size; ++i) {
if (getenv(list[i]))
return true;
}
return false;
}
static bool isLibgmallocEnabled()
{
char* variable = getenv("DYLD_INSERT_LIBRARIES");
if (!variable)
return false;
if (!strstr(variable, "libgmalloc"))
return false;
return true;
}
static bool isSanitizerEnabled()
{
#if BOS(DARWIN)
static const char sanitizerPrefix[] = "/libclang_rt.";
static const char asanName[] = "asan_";
static const char tsanName[] = "tsan_";
uint32_t imageCount = _dyld_image_count();
for (uint32_t i = 0; i < imageCount; ++i) {
const char* imageName = _dyld_get_image_name(i);
if (!imageName)
continue;
if (const char* s = strstr(imageName, sanitizerPrefix)) {
const char* sanitizerName = s + sizeof(sanitizerPrefix) - 1;
if (!strncmp(sanitizerName, asanName, sizeof(asanName) - 1))
return true;
if (!strncmp(sanitizerName, tsanName, sizeof(tsanName) - 1))
return true;
}
}
return false;
#elif BOS(UNIX)
void* handle = dlopen(nullptr, RTLD_NOW);
if (!handle)
return false;
bool result = !!dlsym(handle, "__asan_init") || !!dlsym(handle, "__tsan_init");
dlclose(handle);
return result;
#else
return false;
#endif
}
#if BUSE(CHECK_NANO_MALLOC)
static bool isNanoMallocEnabled()
{
int result = !!malloc_engaged_nano();
return result;
}
#endif
DEFINE_STATIC_PER_PROCESS_STORAGE(Environment);
Environment::Environment(const LockHolder&)
: m_isDebugHeapEnabled(computeIsDebugHeapEnabled())
{
}
bool Environment::computeIsDebugHeapEnabled()
{
if (isMallocEnvironmentVariableSet())
return true;
if (isLibgmallocEnabled())
return true;
if (isSanitizerEnabled())
return true;
#if BUSE(CHECK_NANO_MALLOC)
if (!isNanoMallocEnabled() && !shouldProcessUnconditionallyUseBmalloc())
return true;
#endif
#if BENABLE_MALLOC_HEAP_BREAKDOWN
return true;
#endif
return false;
}
} // namespace bmalloc