tests/map_test.cpp

//===-- map_test.cpp --------------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//

#include "tests/scudo_unit_test.h"

#include "common.h"

#include <string.h>
#include <unistd.h>

static const char *MappingName = "scudo:test";

TEST(ScudoMapTest, PageSize) {
  EXPECT_EQ(scudo::getPageSizeCached(),
            static_cast<scudo::uptr>(getpagesize()));
}

TEST(ScudoMapTest, MapNoAccessUnmap) {
  const scudo::uptr Size = 4 * scudo::getPageSizeCached();
  scudo::MapPlatformData Data = {};
  void *P = scudo::map(nullptr, Size, MappingName, MAP_NOACCESS, &Data);
  EXPECT_NE(P, nullptr);
  EXPECT_DEATH(memset(P, 0xaa, Size), "");
  scudo::unmap(P, Size, UNMAP_ALL, &Data);
}

TEST(ScudoMapTest, MapUnmap) {
  const scudo::uptr Size = 4 * scudo::getPageSizeCached();
  EXPECT_DEATH(
      {
        // Repeat few time to avoid missing crash if it's mmaped by unrelated
        // code.
        for (int i = 0; i < 10; ++i) {
          void *P = scudo::map(nullptr, Size, MappingName, 0, nullptr);
          if (!P)
            continue;
          scudo::unmap(P, Size, 0, nullptr);
          memset(P, 0xbb, Size);
        }
      },
      "");
}

TEST(ScudoMapTest, MapWithGuardUnmap) {
  const scudo::uptr PageSize = scudo::getPageSizeCached();
  const scudo::uptr Size = 4 * PageSize;
  scudo::MapPlatformData Data = {};
  void *P = scudo::map(nullptr, Size + 2 * PageSize, MappingName, MAP_NOACCESS,
                       &Data);
  EXPECT_NE(P, nullptr);
  void *Q =
      reinterpret_cast<void *>(reinterpret_cast<scudo::uptr>(P) + PageSize);
  EXPECT_EQ(scudo::map(Q, Size, MappingName, 0, &Data), Q);
  memset(Q, 0xaa, Size);
  EXPECT_DEATH(memset(Q, 0xaa, Size + 1), "");
  scudo::unmap(P, Size + 2 * PageSize, UNMAP_ALL, &Data);
}

TEST(ScudoMapTest, MapGrowUnmap) {
  const scudo::uptr PageSize = scudo::getPageSizeCached();
  const scudo::uptr Size = 4 * PageSize;
  scudo::MapPlatformData Data = {};
  void *P = scudo::map(nullptr, Size, MappingName, MAP_NOACCESS, &Data);
  EXPECT_NE(P, nullptr);
  void *Q =
      reinterpret_cast<void *>(reinterpret_cast<scudo::uptr>(P) + PageSize);
  EXPECT_EQ(scudo::map(Q, PageSize, MappingName, 0, &Data), Q);
  memset(Q, 0xaa, PageSize);
  Q = reinterpret_cast<void *>(reinterpret_cast<scudo::uptr>(Q) + PageSize);
  EXPECT_EQ(scudo::map(Q, PageSize, MappingName, 0, &Data), Q);
  memset(Q, 0xbb, PageSize);
  scudo::unmap(P, Size, UNMAP_ALL, &Data);
}