New version of unwinder.

Bug: 23762183

Test: All unit tests pass.
Change-Id: I0ac69e55af56e1142c0a1ee3715cdc48f2ed3ec3

1 files changed, 156 insertions, 0 deletions

diff --git a/libunwindstack/tests/MemoryRemoteTest.cpp b/libunwindstack/tests/MemoryRemoteTest.cpp
new file mode 100644
index 000000000..49244a50e
--- /dev/null
+++ b/libunwindstack/tests/MemoryRemoteTest.cpp
@@ -0,0 +1,156 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <errno.h>
+#include <signal.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/ptrace.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+
+#include <vector>
+
+#include <android-base/test_utils.h>
+#include <android-base/file.h>
+#include <gtest/gtest.h>
+
+#include "Memory.h"
+
+#include "LogFake.h"
+
+class MemoryRemoteTest : public ::testing::Test {
+ protected:
+  void SetUp() override {
+    ResetLogs();
+  }
+
+  static uint64_t NanoTime() {
+    struct timespec t = { 0, 0 };
+    clock_gettime(CLOCK_MONOTONIC, &t);
+    return static_cast<uint64_t>(t.tv_sec * NS_PER_SEC + t.tv_nsec);
+  }
+
+  static bool Attach(pid_t pid) {
+    if (ptrace(PTRACE_ATTACH, pid, 0, 0) == -1) {
+      return false;
+    }
+
+    uint64_t start = NanoTime();
+    siginfo_t si;
+    while (TEMP_FAILURE_RETRY(ptrace(PTRACE_GETSIGINFO, pid, 0, &si)) < 0 && errno == ESRCH) {
+      if ((NanoTime() - start) > 10 * NS_PER_SEC) {
+        printf("%d: Failed to stop after 10 seconds.\n", pid);
+        return false;
+      }
+      usleep(30);
+    }
+    return true;
+  }
+
+  static bool Detach(pid_t pid) {
+    return ptrace(PTRACE_DETACH, pid, 0, 0) == 0;
+  }
+
+  static constexpr size_t NS_PER_SEC = 1000000000ULL;
+};
+
+TEST_F(MemoryRemoteTest, read) {
+  std::vector<uint8_t> src(1024);
+  memset(src.data(), 0x4c, 1024);
+
+  pid_t pid;
+  if ((pid = fork()) == 0) {
+    while (true);
+    exit(1);
+  }
+  ASSERT_LT(0, pid);
+
+  ASSERT_TRUE(Attach(pid));
+
+  MemoryRemote remote(pid);
+
+  std::vector<uint8_t> dst(1024);
+  ASSERT_TRUE(remote.Read(reinterpret_cast<uint64_t>(src.data()), dst.data(), 1024));
+  for (size_t i = 0; i < 1024; i++) {
+    ASSERT_EQ(0x4cU, dst[i]) << "Failed at byte " << i;
+  }
+
+  ASSERT_TRUE(Detach(pid));
+
+  kill(pid, SIGKILL);
+}
+
+TEST_F(MemoryRemoteTest, read_fail) {
+  int pagesize = getpagesize();
+  void* src = mmap(nullptr, pagesize * 2, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE,-1, 0);
+  memset(src, 0x4c, pagesize * 2);
+  ASSERT_NE(MAP_FAILED, src);
+  // Put a hole right after the first page.
+  ASSERT_EQ(0, munmap(reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(src) + pagesize),
+                      pagesize));
+
+  pid_t pid;
+  if ((pid = fork()) == 0) {
+    while (true);
+    exit(1);
+  }
+  ASSERT_LT(0, pid);
+
+  ASSERT_TRUE(Attach(pid));
+
+  MemoryRemote remote(pid);
+
+  std::vector<uint8_t> dst(pagesize);
+  ASSERT_TRUE(remote.Read(reinterpret_cast<uint64_t>(src), dst.data(), pagesize));
+  for (size_t i = 0; i < 1024; i++) {
+    ASSERT_EQ(0x4cU, dst[i]) << "Failed at byte " << i;
+  }
+
+  ASSERT_FALSE(remote.Read(reinterpret_cast<uint64_t>(src) + pagesize, dst.data(), 1));
+  ASSERT_TRUE(remote.Read(reinterpret_cast<uint64_t>(src) + pagesize - 1, dst.data(), 1));
+  ASSERT_FALSE(remote.Read(reinterpret_cast<uint64_t>(src) + pagesize - 4, dst.data(), 8));
+
+  ASSERT_EQ(0, munmap(src, pagesize));
+
+  ASSERT_TRUE(Detach(pid));
+
+  kill(pid, SIGKILL);
+}
+
+TEST_F(MemoryRemoteTest, read_illegal) {
+  pid_t pid;
+  if ((pid = fork()) == 0) {
+    while (true);
+    exit(1);
+  }
+  ASSERT_LT(0, pid);
+
+  ASSERT_TRUE(Attach(pid));
+
+  MemoryRemote remote(pid);
+
+  std::vector<uint8_t> dst(100);
+  ASSERT_FALSE(remote.Read(0, dst.data(), 1));
+  ASSERT_FALSE(remote.Read(0, dst.data(), 100));
+
+  ASSERT_TRUE(Detach(pid));
+
+  kill(pid, SIGKILL);
+}