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Improve stack sanitization unittests.

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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>
This commit is contained in:
Tobias Sargeant 2017-02-24 19:58:13 +00:00 committed by Tobias Sargeant
parent 19af23e3c0
commit ccf03c13eb
2 changed files with 67 additions and 41 deletions
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5
src/client/linux/minidump_writer/linux_dumper_unittest_helper.cc
View file

@ -57,14 +57,15 @@
void *thread_function(void *data) {
int pipefd = *static_cast<int *>(data);
volatile pid_t thread_id = syscall(__NR_gettid);
volatile pid_t* thread_id = new pid_t;
*thread_id = syscall(__NR_gettid);
// Signal parent that a thread has started.
uint8_t byte = 1;
if (write(pipefd, &byte, sizeof(byte)) != sizeof(byte)) {
perror("ERROR: parent notification failed");
return NULL;
}
register volatile pid_t *thread_id_ptr asm(TID_PTR_REGISTER) = &thread_id;
register volatile pid_t *thread_id_ptr asm(TID_PTR_REGISTER) = thread_id;
while (true)
asm volatile ("" : : "r" (thread_id_ptr));
return NULL;

103
src/client/linux/minidump_writer/linux_ptrace_dumper_unittest.cc
View file

@ -490,58 +490,83 @@ TEST_F(LinuxPtraceDumperTest, SanitizeStackCopy) {
ThreadInfo thread_info;
EXPECT_TRUE(dumper.GetThreadInfoByIndex(0, &thread_info));
const void* stack;
size_t stack_len;
EXPECT_TRUE(dumper.GetStackInfo(&stack, &stack_len, thread_info.stack_pointer));
const uintptr_t defaced =
#if defined(__LP64__)
0x0defaced0defaced;
#else
0x0defaced;
#endif
uint8_t* stack_copy = new uint8_t[stack_len];
dumper.CopyFromProcess(stack_copy, child_pid, stack, stack_len);
uintptr_t simulated_stack[2];
size_t stack_offset =
thread_info.stack_pointer - reinterpret_cast<uintptr_t>(stack);
// Pointers into the stack shouldn't be sanitized.
memset(simulated_stack, 0xff, sizeof(simulated_stack));
simulated_stack[1] = thread_info.stack_pointer;
dumper.SanitizeStackCopy(reinterpret_cast<uint8_t*>(&simulated_stack),
sizeof(simulated_stack), thread_info.stack_pointer,
sizeof(uintptr_t));
ASSERT_NE(simulated_stack[1], defaced);
const size_t word_count = (stack_len - stack_offset) / sizeof(uintptr_t);
uintptr_t* stack_words = new uintptr_t[word_count];
// Memory prior to the stack pointer should be cleared.
ASSERT_EQ(simulated_stack[0], 0u);
memcpy(stack_words, stack_copy + stack_offset, word_count * sizeof(uintptr_t));
std::map<uintptr_t, int> pre_sanitization_words;
for (size_t i = 0; i < word_count; ++i)
++pre_sanitization_words[stack_words[i]];
dumper.SanitizeStackCopy(stack_copy, stack_len, thread_info.stack_pointer,
stack_offset);
// Memory below the stack pointer should be zeroed.
for (size_t i = 0; i < stack_offset; ++i) {
ASSERT_EQ(0, stack_copy[i]);
// Small integers should not be sanitized.
for (int i = -4096; i <= 4096; ++i) {
memset(simulated_stack, 0, sizeof(simulated_stack));
simulated_stack[0] = static_cast<uintptr_t>(i);
dumper.SanitizeStackCopy(reinterpret_cast<uint8_t*>(&simulated_stack),
sizeof(simulated_stack), thread_info.stack_pointer,
0u);
ASSERT_NE(simulated_stack[0], defaced);
}
memcpy(stack_words, stack_copy + stack_offset, word_count * sizeof(uintptr_t));
std::map<uintptr_t, int> post_sanitization_words;
for (size_t i = 0; i < word_count; ++i)
++post_sanitization_words[stack_words[i]];
// The instruction pointer definitely should point into an executable mapping.
const MappingInfo* mapping_info = dumper.FindMappingNoBias(
reinterpret_cast<uintptr_t>(thread_info.GetInstructionPointer()));
ASSERT_NE(mapping_info, nullptr);
ASSERT_TRUE(mapping_info->exec);
std::set<uintptr_t> words;
for (auto &word : pre_sanitization_words) words.insert(word.first);
for (auto &word : post_sanitization_words) words.insert(word.first);
// Pointers to code shouldn't be sanitized.
memset(simulated_stack, 0, sizeof(simulated_stack));
simulated_stack[1] = thread_info.GetInstructionPointer();
dumper.SanitizeStackCopy(reinterpret_cast<uint8_t*>(&simulated_stack),
sizeof(simulated_stack), thread_info.stack_pointer,
0u);
ASSERT_NE(simulated_stack[0], defaced);
for (auto word : words) {
if (word == static_cast<uintptr_t>(0X0DEFACED0DEFACEDull)) {
continue;
}
// String fragments should be sanitized.
memcpy(simulated_stack, "abcdefghijklmnop", sizeof(simulated_stack));
dumper.SanitizeStackCopy(reinterpret_cast<uint8_t*>(&simulated_stack),
sizeof(simulated_stack), thread_info.stack_pointer,
0u);
ASSERT_EQ(simulated_stack[0], defaced);
ASSERT_EQ(simulated_stack[1], defaced);
bool should_be_sanitized = true;
if (static_cast<intptr_t>(word) <= 4096 &&
static_cast<intptr_t>(word) >= -4096) should_be_sanitized = false;
if (dumper.FindMappingNoBias(word)) should_be_sanitized = false;
ASSERT_EQ(should_be_sanitized, post_sanitization_words[word] == 0);
}
// Heap pointers should be sanititzed.
#if defined(__ARM_EABI__)
uintptr_t heap_addr = thread_info.regs.uregs[3];
#elif defined(__aarch64__)
uintptr_t heap_addr = thread_info.regs.regs[3];
#elif defined(__i386)
uintptr_t heap_addr = thread_info.regs.ecx;
#elif defined(__x86_64)
uintptr_t heap_addr = thread_info.regs.rcx;
#elif defined(__mips__)
uintptr_t heap_addr = thread_info.mcontext.gregs[1];
#else
#error This test has not been ported to this platform.
#endif
memset(simulated_stack, 0, sizeof(simulated_stack));
simulated_stack[0] = heap_addr;
dumper.SanitizeStackCopy(reinterpret_cast<uint8_t*>(&simulated_stack),
sizeof(simulated_stack), thread_info.stack_pointer,
0u);
ASSERT_EQ(simulated_stack[0], defaced);
EXPECT_TRUE(dumper.ThreadsResume());
kill(child_pid, SIGKILL);
// Reap child
// Reap child.
int status;
ASSERT_NE(-1, HANDLE_EINTR(waitpid(child_pid, &status, 0)));
ASSERT_TRUE(WIFSIGNALED(status));