msan_linux.cpp | Explore in Territory

//===-- msan_linux.cpp ----------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of MemorySanitizer.
//
// Linux-, NetBSD- and FreeBSD-specific code.
//===----------------------------------------------------------------------===//

#include "sanitizer_common/sanitizer_platform.h"
#if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD

#  include <elf.h>
#  include <link.h>
#  include <pthread.h>
#  include <signal.h>
#  include <stdio.h>
#  include <stdlib.h>
#  if SANITIZER_LINUX
#    include <sys/personality.h>
#  endif
#  include <sys/resource.h>
#  include <sys/time.h>
#  include <unistd.h>
#  include <unwind.h>

#  include "msan.h"
#  include "msan_allocator.h"
#  include "msan_chained_origin_depot.h"
#  include "msan_report.h"
#  include "msan_thread.h"
#  include "sanitizer_common/sanitizer_common.h"
#  include "sanitizer_common/sanitizer_procmaps.h"
#  include "sanitizer_common/sanitizer_stackdepot.h"

namespace __msan {

void ReportMapRange(const char *descr, uptr beg, uptr size) { … }

static bool CheckMemoryRangeAvailability(uptr beg, uptr size, bool verbose) { … }

static bool ProtectMemoryRange(uptr beg, uptr size, const char *name) { … }

static void CheckMemoryLayoutSanity() { … }

static bool InitShadow(bool init_origins, bool dry_run) { … }

bool InitShadowWithReExec(bool init_origins) { … }

static void MsanAtExit(void) { … }

void InstallAtExitHandler() { … }

// ---------------------- TSD ---------------- {{{1

#if SANITIZER_NETBSD
// Thread Static Data cannot be used in early init on NetBSD.
// Reuse the MSan TSD API for compatibility with existing code
// with an alternative implementation.

static void (*tsd_destructor)(void *tsd) = nullptr;

struct tsd_key {
  tsd_key() : key(nullptr) {}
  ~tsd_key() {
    CHECK(tsd_destructor);
    if (key)
      (*tsd_destructor)(key);
  }
  MsanThread *key;
};

static thread_local struct tsd_key key;

void MsanTSDInit(void (*destructor)(void *tsd)) {
  CHECK(!tsd_destructor);
  tsd_destructor = destructor;
}

MsanThread *GetCurrentThread() {
  CHECK(tsd_destructor);
  return key.key;
}

void SetCurrentThread(MsanThread *tsd) {
  CHECK(tsd_destructor);
  CHECK(tsd);
  CHECK(!key.key);
  key.key = tsd;
}

void MsanTSDDtor(void *tsd) {
  CHECK(tsd_destructor);
  CHECK_EQ(key.key, tsd);
  key.key = nullptr;
  // Make sure that signal handler can not see a stale current thread pointer.
  atomic_signal_fence(memory_order_seq_cst);
  MsanThread::TSDDtor(tsd);
}
#else
static pthread_key_t tsd_key;
static bool tsd_key_inited = …;

void MsanTSDInit(void (*destructor)(void *tsd)) { … }

static THREADLOCAL MsanThread* msan_current_thread;

MsanThread *GetCurrentThread() { … }

void SetCurrentThread(MsanThread *t) { … }

void MsanTSDDtor(void *tsd) { … }
#  endif

static void BeforeFork() { … }

static void AfterFork(bool fork_child) { … }

void InstallAtForkHandler() { … }

} // namespace __msan

#endif // SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD
llvm/compiler-rt/lib/msan/msan_linux.cpp
