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/*
* 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 <unwindstack/Memory.h>
#include "MemoryFake.h"
namespace unwindstack {
class MemoryRemoteTest : public ::testing::Test {
protected:
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);
ASSERT_EQ(pid, wait(nullptr));
}
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));
// Check overflow condition is caught properly.
ASSERT_FALSE(remote.Read(UINT64_MAX - 100, dst.data(), 200));
ASSERT_EQ(0, munmap(src, pagesize));
ASSERT_TRUE(Detach(pid));
kill(pid, SIGKILL);
ASSERT_EQ(pid, wait(nullptr));
}
TEST_F(MemoryRemoteTest, read_overflow) {
MemoryFakeRemote remote;
// Check overflow condition is caught properly.
std::vector<uint8_t> dst(200);
ASSERT_FALSE(remote.Read(UINT64_MAX - 100, dst.data(), 200));
}
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);
ASSERT_EQ(pid, wait(nullptr));
}
} // namespace unwindstack
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