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Improve stack sanitization unittests.
Rather than relying on the process stack having all the things that should/shouldn't be sanitized, create synthetic stacks to test all of the important cases. BUG=664460 Change-Id: I959266390e94d6fb83ca8ef11ac19fac89e68c31 Reviewed-on: https://chromium-review.googlesource.com/446108 Reviewed-by: Robert Sesek <rsesek@chromium.org>
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@ -57,14 +57,15 @@
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void *thread_function(void *data) {
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int pipefd = *static_cast<int *>(data);
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volatile pid_t thread_id = syscall(__NR_gettid);
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volatile pid_t* thread_id = new pid_t;
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*thread_id = syscall(__NR_gettid);
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// Signal parent that a thread has started.
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uint8_t byte = 1;
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if (write(pipefd, &byte, sizeof(byte)) != sizeof(byte)) {
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perror("ERROR: parent notification failed");
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return NULL;
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}
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register volatile pid_t *thread_id_ptr asm(TID_PTR_REGISTER) = &thread_id;
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register volatile pid_t *thread_id_ptr asm(TID_PTR_REGISTER) = thread_id;
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while (true)
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asm volatile ("" : : "r" (thread_id_ptr));
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return NULL;
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@ -490,58 +490,83 @@ TEST_F(LinuxPtraceDumperTest, SanitizeStackCopy) {
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ThreadInfo thread_info;
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EXPECT_TRUE(dumper.GetThreadInfoByIndex(0, &thread_info));
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const void* stack;
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size_t stack_len;
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EXPECT_TRUE(dumper.GetStackInfo(&stack, &stack_len, thread_info.stack_pointer));
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const uintptr_t defaced =
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#if defined(__LP64__)
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0x0defaced0defaced;
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#else
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0x0defaced;
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#endif
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uint8_t* stack_copy = new uint8_t[stack_len];
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dumper.CopyFromProcess(stack_copy, child_pid, stack, stack_len);
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uintptr_t simulated_stack[2];
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size_t stack_offset =
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thread_info.stack_pointer - reinterpret_cast<uintptr_t>(stack);
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// Pointers into the stack shouldn't be sanitized.
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memset(simulated_stack, 0xff, sizeof(simulated_stack));
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simulated_stack[1] = thread_info.stack_pointer;
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dumper.SanitizeStackCopy(reinterpret_cast<uint8_t*>(&simulated_stack),
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sizeof(simulated_stack), thread_info.stack_pointer,
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sizeof(uintptr_t));
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ASSERT_NE(simulated_stack[1], defaced);
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const size_t word_count = (stack_len - stack_offset) / sizeof(uintptr_t);
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uintptr_t* stack_words = new uintptr_t[word_count];
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// Memory prior to the stack pointer should be cleared.
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ASSERT_EQ(simulated_stack[0], 0u);
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memcpy(stack_words, stack_copy + stack_offset, word_count * sizeof(uintptr_t));
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std::map<uintptr_t, int> pre_sanitization_words;
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for (size_t i = 0; i < word_count; ++i)
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++pre_sanitization_words[stack_words[i]];
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dumper.SanitizeStackCopy(stack_copy, stack_len, thread_info.stack_pointer,
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stack_offset);
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// Memory below the stack pointer should be zeroed.
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for (size_t i = 0; i < stack_offset; ++i) {
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ASSERT_EQ(0, stack_copy[i]);
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// Small integers should not be sanitized.
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for (int i = -4096; i <= 4096; ++i) {
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memset(simulated_stack, 0, sizeof(simulated_stack));
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simulated_stack[0] = static_cast<uintptr_t>(i);
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dumper.SanitizeStackCopy(reinterpret_cast<uint8_t*>(&simulated_stack),
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sizeof(simulated_stack), thread_info.stack_pointer,
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0u);
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ASSERT_NE(simulated_stack[0], defaced);
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}
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memcpy(stack_words, stack_copy + stack_offset, word_count * sizeof(uintptr_t));
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std::map<uintptr_t, int> post_sanitization_words;
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for (size_t i = 0; i < word_count; ++i)
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++post_sanitization_words[stack_words[i]];
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// The instruction pointer definitely should point into an executable mapping.
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const MappingInfo* mapping_info = dumper.FindMappingNoBias(
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reinterpret_cast<uintptr_t>(thread_info.GetInstructionPointer()));
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ASSERT_NE(mapping_info, nullptr);
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ASSERT_TRUE(mapping_info->exec);
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std::set<uintptr_t> words;
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for (auto &word : pre_sanitization_words) words.insert(word.first);
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for (auto &word : post_sanitization_words) words.insert(word.first);
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// Pointers to code shouldn't be sanitized.
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memset(simulated_stack, 0, sizeof(simulated_stack));
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simulated_stack[1] = thread_info.GetInstructionPointer();
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dumper.SanitizeStackCopy(reinterpret_cast<uint8_t*>(&simulated_stack),
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sizeof(simulated_stack), thread_info.stack_pointer,
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0u);
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ASSERT_NE(simulated_stack[0], defaced);
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for (auto word : words) {
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if (word == static_cast<uintptr_t>(0X0DEFACED0DEFACEDull)) {
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continue;
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}
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// String fragments should be sanitized.
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memcpy(simulated_stack, "abcdefghijklmnop", sizeof(simulated_stack));
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dumper.SanitizeStackCopy(reinterpret_cast<uint8_t*>(&simulated_stack),
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sizeof(simulated_stack), thread_info.stack_pointer,
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0u);
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ASSERT_EQ(simulated_stack[0], defaced);
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ASSERT_EQ(simulated_stack[1], defaced);
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bool should_be_sanitized = true;
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if (static_cast<intptr_t>(word) <= 4096 &&
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static_cast<intptr_t>(word) >= -4096) should_be_sanitized = false;
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if (dumper.FindMappingNoBias(word)) should_be_sanitized = false;
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ASSERT_EQ(should_be_sanitized, post_sanitization_words[word] == 0);
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}
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// Heap pointers should be sanititzed.
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#if defined(__ARM_EABI__)
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uintptr_t heap_addr = thread_info.regs.uregs[3];
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#elif defined(__aarch64__)
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uintptr_t heap_addr = thread_info.regs.regs[3];
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#elif defined(__i386)
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uintptr_t heap_addr = thread_info.regs.ecx;
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#elif defined(__x86_64)
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uintptr_t heap_addr = thread_info.regs.rcx;
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#elif defined(__mips__)
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uintptr_t heap_addr = thread_info.mcontext.gregs[1];
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#else
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#error This test has not been ported to this platform.
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#endif
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memset(simulated_stack, 0, sizeof(simulated_stack));
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simulated_stack[0] = heap_addr;
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dumper.SanitizeStackCopy(reinterpret_cast<uint8_t*>(&simulated_stack),
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sizeof(simulated_stack), thread_info.stack_pointer,
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0u);
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ASSERT_EQ(simulated_stack[0], defaced);
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EXPECT_TRUE(dumper.ThreadsResume());
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kill(child_pid, SIGKILL);
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// Reap child
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// Reap child.
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int status;
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ASSERT_NE(-1, HANDLE_EINTR(waitpid(child_pid, &status, 0)));
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ASSERT_TRUE(WIFSIGNALED(status));
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