| // Copyright (c) 2010, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| // Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com> |
| |
| // stackwalker_amd64_unittest.cc: Unit tests for StackwalkerAMD64 class. |
| |
| #include <string.h> |
| #include <string> |
| #include <vector> |
| |
| #include "breakpad_googletest_includes.h" |
| #include "common/test_assembler.h" |
| #include "common/using_std_string.h" |
| #include "google_breakpad/common/minidump_format.h" |
| #include "google_breakpad/processor/basic_source_line_resolver.h" |
| #include "google_breakpad/processor/call_stack.h" |
| #include "google_breakpad/processor/code_module.h" |
| #include "google_breakpad/processor/source_line_resolver_interface.h" |
| #include "google_breakpad/processor/stack_frame_cpu.h" |
| #include "processor/stackwalker_unittest_utils.h" |
| #include "processor/stackwalker_amd64.h" |
| |
| using google_breakpad::BasicSourceLineResolver; |
| using google_breakpad::CallStack; |
| using google_breakpad::CodeModule; |
| using google_breakpad::StackFrameSymbolizer; |
| using google_breakpad::StackFrame; |
| using google_breakpad::StackFrameAMD64; |
| using google_breakpad::Stackwalker; |
| using google_breakpad::StackwalkerAMD64; |
| using google_breakpad::SystemInfo; |
| using google_breakpad::test_assembler::kLittleEndian; |
| using google_breakpad::test_assembler::Label; |
| using google_breakpad::test_assembler::Section; |
| using std::vector; |
| using testing::_; |
| using testing::AnyNumber; |
| using testing::Return; |
| using testing::SetArgumentPointee; |
| using testing::Test; |
| |
| class StackwalkerAMD64Fixture { |
| public: |
| StackwalkerAMD64Fixture() |
| : stack_section(kLittleEndian), |
| // Give the two modules reasonable standard locations and names |
| // for tests to play with. |
| module1(0x00007400c0000000ULL, 0x10000, "module1", "version1"), |
| module2(0x00007500b0000000ULL, 0x10000, "module2", "version2") { |
| // Identify the system as a Linux system. |
| system_info.os = "Linux"; |
| system_info.os_short = "linux"; |
| system_info.os_version = "Horrendous Hippo"; |
| system_info.cpu = "x86"; |
| system_info.cpu_info = ""; |
| |
| // Put distinctive values in the raw CPU context. |
| BrandContext(&raw_context); |
| |
| // Create some modules with some stock debugging information. |
| modules.Add(&module1); |
| modules.Add(&module2); |
| |
| // By default, none of the modules have symbol info; call |
| // SetModuleSymbols to override this. |
| EXPECT_CALL(supplier, GetCStringSymbolData(_, _, _, _, _)) |
| .WillRepeatedly(Return(MockSymbolSupplier::NOT_FOUND)); |
| |
| // Avoid GMOCK WARNING "Uninteresting mock function call - returning |
| // directly" for FreeSymbolData(). |
| EXPECT_CALL(supplier, FreeSymbolData(_)).Times(AnyNumber()); |
| |
| // Reset max_frames_scanned since it's static. |
| Stackwalker::set_max_frames_scanned(1024); |
| } |
| |
| // Set the Breakpad symbol information that supplier should return for |
| // MODULE to INFO. |
| void SetModuleSymbols(MockCodeModule *module, const string &info) { |
| size_t buffer_size; |
| char *buffer = supplier.CopySymbolDataAndOwnTheCopy(info, &buffer_size); |
| EXPECT_CALL(supplier, GetCStringSymbolData(module, &system_info, _, _, _)) |
| .WillRepeatedly(DoAll(SetArgumentPointee<3>(buffer), |
| SetArgumentPointee<4>(buffer_size), |
| Return(MockSymbolSupplier::FOUND))); |
| } |
| |
| // Populate stack_region with the contents of stack_section. Use |
| // stack_section.start() as the region's starting address. |
| void RegionFromSection() { |
| string contents; |
| ASSERT_TRUE(stack_section.GetContents(&contents)); |
| stack_region.Init(stack_section.start().Value(), contents); |
| } |
| |
| // Fill RAW_CONTEXT with pseudo-random data, for round-trip checking. |
| void BrandContext(MDRawContextAMD64 *raw_context) { |
| uint8_t x = 173; |
| for (size_t i = 0; i < sizeof(*raw_context); i++) |
| reinterpret_cast<uint8_t *>(raw_context)[i] = (x += 17); |
| } |
| |
| SystemInfo system_info; |
| MDRawContextAMD64 raw_context; |
| Section stack_section; |
| MockMemoryRegion stack_region; |
| MockCodeModule module1; |
| MockCodeModule module2; |
| MockCodeModules modules; |
| MockSymbolSupplier supplier; |
| BasicSourceLineResolver resolver; |
| CallStack call_stack; |
| const vector<StackFrame *> *frames; |
| }; |
| |
| class GetContextFrame: public StackwalkerAMD64Fixture, public Test { }; |
| |
| class SanityCheck: public StackwalkerAMD64Fixture, public Test { }; |
| |
| TEST_F(SanityCheck, NoResolver) { |
| // There should be no references to the stack in this walk: we don't |
| // provide any call frame information, so trying to reconstruct the |
| // context frame's caller should fail. So there's no need for us to |
| // provide stack contents. |
| raw_context.rip = 0x00007400c0000200ULL; |
| raw_context.rbp = 0x8000000080000000ULL; |
| |
| StackFrameSymbolizer frame_symbolizer(NULL, NULL); |
| StackwalkerAMD64 walker(&system_info, &raw_context, &stack_region, &modules, |
| &frame_symbolizer); |
| // This should succeed even without a resolver or supplier. |
| vector<const CodeModule*> modules_without_symbols; |
| vector<const CodeModule*> modules_with_corrupt_symbols; |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, |
| &modules_with_corrupt_symbols)); |
| ASSERT_EQ(1U, modules_without_symbols.size()); |
| ASSERT_EQ("module1", modules_without_symbols[0]->debug_file()); |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); |
| frames = call_stack.frames(); |
| ASSERT_GE(1U, frames->size()); |
| StackFrameAMD64 *frame = static_cast<StackFrameAMD64 *>(frames->at(0)); |
| // Check that the values from the original raw context made it |
| // through to the context in the stack frame. |
| EXPECT_EQ(0, memcmp(&raw_context, &frame->context, sizeof(raw_context))); |
| } |
| |
| TEST_F(GetContextFrame, Simple) { |
| // There should be no references to the stack in this walk: we don't |
| // provide any call frame information, so trying to reconstruct the |
| // context frame's caller should fail. So there's no need for us to |
| // provide stack contents. |
| raw_context.rip = 0x00007400c0000200ULL; |
| raw_context.rbp = 0x8000000080000000ULL; |
| |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); |
| StackwalkerAMD64 walker(&system_info, &raw_context, &stack_region, &modules, |
| &frame_symbolizer); |
| vector<const CodeModule*> modules_without_symbols; |
| vector<const CodeModule*> modules_with_corrupt_symbols; |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, |
| &modules_with_corrupt_symbols)); |
| ASSERT_EQ(1U, modules_without_symbols.size()); |
| ASSERT_EQ("module1", modules_without_symbols[0]->debug_file()); |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); |
| frames = call_stack.frames(); |
| ASSERT_GE(1U, frames->size()); |
| StackFrameAMD64 *frame = static_cast<StackFrameAMD64 *>(frames->at(0)); |
| // Check that the values from the original raw context made it |
| // through to the context in the stack frame. |
| EXPECT_EQ(0, memcmp(&raw_context, &frame->context, sizeof(raw_context))); |
| } |
| |
| // The stackwalker should be able to produce the context frame even |
| // without stack memory present. |
| TEST_F(GetContextFrame, NoStackMemory) { |
| raw_context.rip = 0x00007400c0000200ULL; |
| raw_context.rbp = 0x8000000080000000ULL; |
| |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); |
| StackwalkerAMD64 walker(&system_info, &raw_context, NULL, &modules, |
| &frame_symbolizer); |
| vector<const CodeModule*> modules_without_symbols; |
| vector<const CodeModule*> modules_with_corrupt_symbols; |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, |
| &modules_with_corrupt_symbols)); |
| ASSERT_EQ(1U, modules_without_symbols.size()); |
| ASSERT_EQ("module1", modules_without_symbols[0]->debug_file()); |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); |
| frames = call_stack.frames(); |
| ASSERT_GE(1U, frames->size()); |
| StackFrameAMD64 *frame = static_cast<StackFrameAMD64 *>(frames->at(0)); |
| // Check that the values from the original raw context made it |
| // through to the context in the stack frame. |
| EXPECT_EQ(0, memcmp(&raw_context, &frame->context, sizeof(raw_context))); |
| } |
| |
| class GetCallerFrame: public StackwalkerAMD64Fixture, public Test { }; |
| |
| TEST_F(GetCallerFrame, ScanWithoutSymbols) { |
| // When the stack walker resorts to scanning the stack, |
| // only addresses located within loaded modules are |
| // considered valid return addresses. |
| // Force scanning through three frames to ensure that the |
| // stack pointer is set properly in scan-recovered frames. |
| stack_section.start() = 0x8000000080000000ULL; |
| uint64_t return_address1 = 0x00007500b0000100ULL; |
| uint64_t return_address2 = 0x00007500b0000900ULL; |
| Label frame1_sp, frame2_sp, frame1_rbp; |
| stack_section |
| // frame 0 |
| .Append(16, 0) // space |
| |
| .D64(0x00007400b0000000ULL) // junk that's not |
| .D64(0x00007500d0000000ULL) // a return address |
| |
| .D64(return_address1) // actual return address |
| // frame 1 |
| .Mark(&frame1_sp) |
| .Append(16, 0) // space |
| |
| .D64(0x00007400b0000000ULL) // more junk |
| .D64(0x00007500d0000000ULL) |
| |
| .Mark(&frame1_rbp) |
| .D64(stack_section.start()) // This is in the right place to be |
| // a saved rbp, but it's bogus, so |
| // we shouldn't report it. |
| |
| .D64(return_address2) // actual return address |
| // frame 2 |
| .Mark(&frame2_sp) |
| .Append(32, 0); // end of stack |
| |
| RegionFromSection(); |
| |
| raw_context.rip = 0x00007400c0000200ULL; |
| raw_context.rbp = frame1_rbp.Value(); |
| raw_context.rsp = stack_section.start().Value(); |
| |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); |
| StackwalkerAMD64 walker(&system_info, &raw_context, &stack_region, &modules, |
| &frame_symbolizer); |
| vector<const CodeModule*> modules_without_symbols; |
| vector<const CodeModule*> modules_with_corrupt_symbols; |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, |
| &modules_with_corrupt_symbols)); |
| ASSERT_EQ(2U, modules_without_symbols.size()); |
| ASSERT_EQ("module1", modules_without_symbols[0]->debug_file()); |
| ASSERT_EQ("module2", modules_without_symbols[1]->debug_file()); |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); |
| frames = call_stack.frames(); |
| ASSERT_EQ(3U, frames->size()); |
| |
| StackFrameAMD64 *frame0 = static_cast<StackFrameAMD64 *>(frames->at(0)); |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); |
| ASSERT_EQ(StackFrameAMD64::CONTEXT_VALID_ALL, frame0->context_validity); |
| EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); |
| |
| StackFrameAMD64 *frame1 = static_cast<StackFrameAMD64 *>(frames->at(1)); |
| EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust); |
| ASSERT_EQ((StackFrameAMD64::CONTEXT_VALID_RIP | |
| StackFrameAMD64::CONTEXT_VALID_RSP | |
| StackFrameAMD64::CONTEXT_VALID_RBP), |
| frame1->context_validity); |
| EXPECT_EQ(return_address1, frame1->context.rip); |
| EXPECT_EQ(frame1_sp.Value(), frame1->context.rsp); |
| EXPECT_EQ(frame1_rbp.Value(), frame1->context.rbp); |
| |
| StackFrameAMD64 *frame2 = static_cast<StackFrameAMD64 *>(frames->at(2)); |
| EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame2->trust); |
| ASSERT_EQ((StackFrameAMD64::CONTEXT_VALID_RIP | |
| StackFrameAMD64::CONTEXT_VALID_RSP), |
| frame2->context_validity); |
| EXPECT_EQ(return_address2, frame2->context.rip); |
| EXPECT_EQ(frame2_sp.Value(), frame2->context.rsp); |
| } |
| |
| TEST_F(GetCallerFrame, ScanWithFunctionSymbols) { |
| // During stack scanning, if a potential return address |
| // is located within a loaded module that has symbols, |
| // it is only considered a valid return address if it |
| // lies within a function's bounds. |
| stack_section.start() = 0x8000000080000000ULL; |
| uint64_t return_address = 0x00007500b0000110ULL; |
| Label frame1_sp, frame1_rbp; |
| |
| stack_section |
| // frame 0 |
| .Append(16, 0) // space |
| |
| .D64(0x00007400b0000000ULL) // junk that's not |
| .D64(0x00007500b0000000ULL) // a return address |
| |
| .D64(0x00007400c0001000ULL) // a couple of plausible addresses |
| .D64(0x00007500b000aaaaULL) // that are not within functions |
| |
| .D64(return_address) // actual return address |
| // frame 1 |
| .Mark(&frame1_sp) |
| .Append(32, 0) // end of stack |
| .Mark(&frame1_rbp); |
| RegionFromSection(); |
| |
| raw_context.rip = 0x00007400c0000200ULL; |
| raw_context.rbp = frame1_rbp.Value(); |
| raw_context.rsp = stack_section.start().Value(); |
| |
| SetModuleSymbols(&module1, |
| // The youngest frame's function. |
| "FUNC 100 400 10 platypus\n"); |
| SetModuleSymbols(&module2, |
| // The calling frame's function. |
| "FUNC 100 400 10 echidna\n"); |
| |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); |
| StackwalkerAMD64 walker(&system_info, &raw_context, &stack_region, &modules, |
| &frame_symbolizer); |
| vector<const CodeModule*> modules_without_symbols; |
| vector<const CodeModule*> modules_with_corrupt_symbols; |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, |
| &modules_with_corrupt_symbols)); |
| ASSERT_EQ(0U, modules_without_symbols.size()); |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); |
| frames = call_stack.frames(); |
| ASSERT_EQ(2U, frames->size()); |
| |
| StackFrameAMD64 *frame0 = static_cast<StackFrameAMD64 *>(frames->at(0)); |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); |
| ASSERT_EQ(StackFrameAMD64::CONTEXT_VALID_ALL, frame0->context_validity); |
| EXPECT_EQ("platypus", frame0->function_name); |
| EXPECT_EQ(0x00007400c0000100ULL, frame0->function_base); |
| |
| StackFrameAMD64 *frame1 = static_cast<StackFrameAMD64 *>(frames->at(1)); |
| EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust); |
| ASSERT_EQ((StackFrameAMD64::CONTEXT_VALID_RIP | |
| StackFrameAMD64::CONTEXT_VALID_RSP | |
| StackFrameAMD64::CONTEXT_VALID_RBP), |
| frame1->context_validity); |
| EXPECT_EQ(return_address, frame1->context.rip); |
| EXPECT_EQ(frame1_sp.Value(), frame1->context.rsp); |
| EXPECT_EQ(frame1_rbp.Value(), frame1->context.rbp); |
| EXPECT_EQ("echidna", frame1->function_name); |
| EXPECT_EQ(0x00007500b0000100ULL, frame1->function_base); |
| } |
| |
| // StackwalkerAMD64::GetCallerByFramePointerRecovery should never return an |
| // instruction pointer of 0 because IP of 0 is an end of stack marker and the |
| // stack walk may be terminated prematurely. Instead it should return NULL |
| // so that the stack walking code can proceed to stack scanning. |
| TEST_F(GetCallerFrame, GetCallerByFramePointerRecovery) { |
| MockCodeModule user32_dll(0x00007ff9cb8a0000ULL, 0x14E000, "user32.dll", |
| "version1"); |
| SetModuleSymbols(&user32_dll, // user32.dll |
| "PUBLIC fa60 0 DispatchMessageWorker\n" |
| "PUBLIC fee0 0 UserCallWinProcCheckWow\n" |
| "PUBLIC 1cdb0 0 _fnHkINLPMSG\n" |
| "STACK CFI INIT fa60 340 .cfa: $rsp .ra: .cfa 8 - ^\n" |
| "STACK CFI fa60 .cfa: $rsp 128 +\n" |
| "STACK CFI INIT fee0 49f .cfa: $rsp .ra: .cfa 8 - ^\n" |
| "STACK CFI fee0 .cfa: $rsp 240 +\n" |
| "STACK CFI INIT 1cdb0 9f .cfa: $rsp .ra: .cfa 8 - ^\n" |
| "STACK CFI 1cdb0 .cfa: $rsp 80 +\n"); |
| |
| // Create some modules with some stock debugging information. |
| MockCodeModules local_modules; |
| local_modules.Add(&user32_dll); |
| |
| Label frame0_rsp; |
| Label frame0_rbp; |
| Label frame1_rsp; |
| Label frame2_rsp; |
| |
| stack_section.start() = 0x00000099abf0f238ULL; |
| stack_section |
| .Mark(&frame0_rsp) |
| .D64(0x00007ff9cb8b00dcULL) |
| .Mark(&frame1_rsp) |
| .D64(0x0000000000000000ULL) |
| .D64(0x0000000000000001ULL) |
| .D64(0x00000099abf0f308ULL) |
| .D64(0x00007ff9cb8bce3aULL) // Stack residue from execution of |
| // user32!_fnHkINLPMSG+0x8a |
| .D64(0x000000000000c2e0ULL) |
| .D64(0x00000099abf0f328ULL) |
| .D64(0x0000000100000001ULL) |
| .D64(0x0000000000000000ULL) |
| .D64(0x0000000000000000ULL) |
| .D64(0x0000000000000000ULL) |
| .D64(0x0000000000000000ULL) |
| .D64(0x0000000000000000ULL) |
| .D64(0x0000000000000000ULL) |
| .D64(0x00007ff9ccad53e4ULL) |
| .D64(0x0000000000000048ULL) |
| .D64(0x0000000000000001ULL) |
| .D64(0x00000099abf0f5e0ULL) |
| .D64(0x00000099b61f7388ULL) |
| .D64(0x0000000000000030ULL) |
| .D64(0xffffff66540f0a1fULL) |
| .D64(0xffffff6649e08c77ULL) |
| .D64(0x00007ff9cb8affb4ULL) // Return address in |
| // user32!UserCallWinProcCheckWow+0xd4 |
| .D64(0x0000000000000000ULL) |
| .D64(0x00000099abf0f368ULL) |
| .D64(0x0000000000000000ULL) |
| .D64(0x0000000000000000ULL) |
| .D64(0x0000000000000000ULL) |
| .D64(0x00000099a8150fd8ULL) |
| .D64(0x00000099abf0f3e8ULL) |
| .D64(0x00007ff9cb8afc07ULL) // Return address in |
| // user32!DispatchMessageWorker+0x1a7 |
| .Mark(&frame2_rsp) |
| .Append(256, 0) |
| .Mark(&frame0_rbp) // The following are expected by |
| // GetCallerByFramePointerRecovery. |
| .D64(0xfffffffffffffffeULL) // %caller_rbp = *(%callee_rbp) |
| .D64(0x0000000000000000ULL) // %caller_rip = *(%callee_rbp + 8) |
| .D64(0x00000099a3e31040ULL) // %caller_rsp = *(%callee_rbp + 16) |
| .Append(256, 0); |
| |
| RegionFromSection(); |
| raw_context.rip = 0x00000099a8150fd8ULL; // IP in context frame is guarbage |
| raw_context.rsp = frame0_rsp.Value(); |
| raw_context.rbp = frame0_rbp.Value(); |
| |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); |
| StackwalkerAMD64 walker(&system_info, &raw_context, &stack_region, |
| &local_modules, &frame_symbolizer); |
| vector<const CodeModule*> modules_without_symbols; |
| vector<const CodeModule*> modules_with_corrupt_symbols; |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, |
| &modules_with_corrupt_symbols)); |
| ASSERT_EQ(0U, modules_without_symbols.size()); |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); |
| frames = call_stack.frames(); |
| |
| ASSERT_EQ(3U, frames->size()); |
| |
| { // To avoid reusing locals by mistake |
| StackFrameAMD64 *frame = static_cast<StackFrameAMD64 *>(frames->at(0)); |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame->trust); |
| ASSERT_EQ(StackFrameAMD64::CONTEXT_VALID_ALL, frame->context_validity); |
| EXPECT_EQ("", frame->function_name); |
| EXPECT_EQ(0x00000099a8150fd8ULL, frame->instruction); |
| EXPECT_EQ(0x00000099a8150fd8ULL, frame->context.rip); |
| EXPECT_EQ(frame0_rsp.Value(), frame->context.rsp); |
| EXPECT_EQ(frame0_rbp.Value(), frame->context.rbp); |
| } |
| |
| { // To avoid reusing locals by mistake |
| StackFrameAMD64 *frame = static_cast<StackFrameAMD64 *>(frames->at(1)); |
| EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame->trust); |
| ASSERT_EQ((StackFrameAMD64::CONTEXT_VALID_RIP | |
| StackFrameAMD64::CONTEXT_VALID_RSP | |
| StackFrameAMD64::CONTEXT_VALID_RBP), |
| frame->context_validity); |
| EXPECT_EQ("UserCallWinProcCheckWow", frame->function_name); |
| EXPECT_EQ(140710838468828ULL, frame->instruction + 1); |
| EXPECT_EQ(140710838468828ULL, frame->context.rip); |
| EXPECT_EQ(frame1_rsp.Value(), frame->context.rsp); |
| EXPECT_EQ(&user32_dll, frame->module); |
| } |
| |
| { // To avoid reusing locals by mistake |
| StackFrameAMD64 *frame = static_cast<StackFrameAMD64 *>(frames->at(2)); |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CFI, frame->trust); |
| ASSERT_EQ((StackFrameAMD64::CONTEXT_VALID_RIP | |
| StackFrameAMD64::CONTEXT_VALID_RSP | |
| StackFrameAMD64::CONTEXT_VALID_RBP), |
| frame->context_validity); |
| EXPECT_EQ("DispatchMessageWorker", frame->function_name); |
| EXPECT_EQ(140710838467591ULL, frame->instruction + 1); |
| EXPECT_EQ(140710838467591ULL, frame->context.rip); |
| EXPECT_EQ(frame2_rsp.Value(), frame->context.rsp); |
| EXPECT_EQ(&user32_dll, frame->module); |
| } |
| } |
| |
| // Don't use frame pointer recovery if %rbp is not 8-byte aligned, which |
| // indicates that it's not being used as a frame pointer. |
| TEST_F(GetCallerFrame, FramePointerNotAligned) { |
| stack_section.start() = 0x8000000080000000ULL; |
| uint64_t return_address1 = 0x00007500b0000100ULL; |
| Label frame0_rbp, not_frame1_rbp, frame1_sp; |
| stack_section |
| // frame 0 |
| .Align(8, 0) |
| .Append(2, 0) // mis-align the frame pointer |
| .Mark(&frame0_rbp) |
| .D64(not_frame1_rbp) // not the previous frame pointer |
| .D64(0x00007500b0000a00ULL) // plausible but wrong return address |
| .Align(8, 0) |
| .D64(return_address1) // return address |
| // frame 1 |
| .Mark(&frame1_sp) |
| .Mark(¬_frame1_rbp) |
| .Append(32, 0); // end of stack |
| |
| |
| RegionFromSection(); |
| |
| raw_context.rip = 0x00007400c0000200ULL; |
| raw_context.rbp = frame0_rbp.Value(); |
| raw_context.rsp = stack_section.start().Value(); |
| |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); |
| StackwalkerAMD64 walker(&system_info, &raw_context, &stack_region, &modules, |
| &frame_symbolizer); |
| vector<const CodeModule*> modules_without_symbols; |
| vector<const CodeModule*> modules_with_corrupt_symbols; |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, |
| &modules_with_corrupt_symbols)); |
| frames = call_stack.frames(); |
| ASSERT_EQ(2U, frames->size()); |
| |
| StackFrameAMD64 *frame0 = static_cast<StackFrameAMD64 *>(frames->at(0)); |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); |
| ASSERT_EQ(StackFrameAMD64::CONTEXT_VALID_ALL, frame0->context_validity); |
| EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); |
| |
| StackFrameAMD64 *frame1 = static_cast<StackFrameAMD64 *>(frames->at(1)); |
| EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust); |
| ASSERT_EQ((StackFrameAMD64::CONTEXT_VALID_RIP | |
| StackFrameAMD64::CONTEXT_VALID_RSP), |
| frame1->context_validity); |
| EXPECT_EQ(return_address1, frame1->context.rip); |
| EXPECT_EQ(frame1_sp.Value(), frame1->context.rsp); |
| } |
| |
| // Don't use frame pointer recovery if the recovered %rip is not |
| // a canonical x86-64 address. |
| TEST_F(GetCallerFrame, NonCanonicalInstructionPointerFromFramePointer) { |
| stack_section.start() = 0x8000000080000000ULL; |
| uint64_t return_address1 = 0x00007500b0000100ULL; |
| Label frame0_rbp, frame1_sp, not_frame1_bp; |
| stack_section |
| // frame 0 |
| .Align(8, 0) |
| .Mark(&frame0_rbp) |
| .D64(not_frame1_bp) // some junk on the stack |
| .D64(0xDADADADADADADADA) // not the return address |
| .D64(return_address1) // return address |
| // frame 1 |
| .Mark(&frame1_sp) |
| .Append(16, 0) |
| .Mark(¬_frame1_bp) |
| .Append(32, 0); // end of stack |
| |
| |
| RegionFromSection(); |
| |
| raw_context.rip = 0x00007400c0000200ULL; |
| raw_context.rbp = frame0_rbp.Value(); |
| raw_context.rsp = stack_section.start().Value(); |
| |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); |
| StackwalkerAMD64 walker(&system_info, &raw_context, &stack_region, &modules, |
| &frame_symbolizer); |
| vector<const CodeModule*> modules_without_symbols; |
| vector<const CodeModule*> modules_with_corrupt_symbols; |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, |
| &modules_with_corrupt_symbols)); |
| frames = call_stack.frames(); |
| ASSERT_EQ(2U, frames->size()); |
| |
| StackFrameAMD64 *frame0 = static_cast<StackFrameAMD64 *>(frames->at(0)); |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); |
| ASSERT_EQ(StackFrameAMD64::CONTEXT_VALID_ALL, frame0->context_validity); |
| EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); |
| |
| StackFrameAMD64 *frame1 = static_cast<StackFrameAMD64 *>(frames->at(1)); |
| EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust); |
| ASSERT_EQ((StackFrameAMD64::CONTEXT_VALID_RIP | |
| StackFrameAMD64::CONTEXT_VALID_RSP), |
| frame1->context_validity); |
| EXPECT_EQ(return_address1, frame1->context.rip); |
| EXPECT_EQ(frame1_sp.Value(), frame1->context.rsp); |
| } |
| |
| // Test that set_max_frames_scanned prevents using stack scanning |
| // to find caller frames. |
| TEST_F(GetCallerFrame, ScanningNotAllowed) { |
| // When the stack walker resorts to scanning the stack, |
| // only addresses located within loaded modules are |
| // considered valid return addresses. |
| stack_section.start() = 0x8000000080000000ULL; |
| uint64_t return_address1 = 0x00007500b0000100ULL; |
| uint64_t return_address2 = 0x00007500b0000900ULL; |
| Label frame1_sp, frame2_sp, frame1_rbp; |
| stack_section |
| // frame 0 |
| .Append(16, 0) // space |
| |
| .D64(0x00007400b0000000ULL) // junk that's not |
| .D64(0x00007500d0000000ULL) // a return address |
| |
| .D64(return_address1) // actual return address |
| // frame 1 |
| .Mark(&frame1_sp) |
| .Append(16, 0) // space |
| |
| .D64(0x00007400b0000000ULL) // more junk |
| .D64(0x00007500d0000000ULL) |
| |
| .Mark(&frame1_rbp) |
| .D64(stack_section.start()) // This is in the right place to be |
| // a saved rbp, but it's bogus, so |
| // we shouldn't report it. |
| |
| .D64(return_address2) // actual return address |
| // frame 2 |
| .Mark(&frame2_sp) |
| .Append(32, 0); // end of stack |
| |
| RegionFromSection(); |
| |
| raw_context.rip = 0x00007400c0000200ULL; |
| raw_context.rbp = frame1_rbp.Value(); |
| raw_context.rsp = stack_section.start().Value(); |
| |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); |
| StackwalkerAMD64 walker(&system_info, &raw_context, &stack_region, &modules, |
| &frame_symbolizer); |
| Stackwalker::set_max_frames_scanned(0); |
| |
| vector<const CodeModule*> modules_without_symbols; |
| vector<const CodeModule*> modules_with_corrupt_symbols; |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, |
| &modules_with_corrupt_symbols)); |
| ASSERT_EQ(1U, modules_without_symbols.size()); |
| ASSERT_EQ("module1", modules_without_symbols[0]->debug_file()); |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); |
| frames = call_stack.frames(); |
| ASSERT_EQ(1U, frames->size()); |
| |
| StackFrameAMD64 *frame0 = static_cast<StackFrameAMD64 *>(frames->at(0)); |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); |
| ASSERT_EQ(StackFrameAMD64::CONTEXT_VALID_ALL, frame0->context_validity); |
| EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); |
| } |
| |
| TEST_F(GetCallerFrame, CallerPushedRBP) { |
| // Functions typically push their %rbp upon entry and set %rbp pointing |
| // there. If stackwalking finds a plausible address for the next frame's |
| // %rbp directly below the return address, assume that it is indeed the |
| // next frame's %rbp. |
| stack_section.start() = 0x8000000080000000ULL; |
| uint64_t return_address = 0x00007500b0000110ULL; |
| Label frame0_rbp, frame1_sp, frame1_rbp; |
| |
| stack_section |
| // frame 0 |
| .Append(16, 0) // space |
| |
| .D64(0x00007400b0000000ULL) // junk that's not |
| .D64(0x00007500b0000000ULL) // a return address |
| |
| .D64(0x00007400c0001000ULL) // a couple of plausible addresses |
| .D64(0x00007500b000aaaaULL) // that are not within functions |
| |
| .Mark(&frame0_rbp) |
| .D64(frame1_rbp) // caller-pushed %rbp |
| .D64(return_address) // actual return address |
| // frame 1 |
| .Mark(&frame1_sp) |
| .Append(32, 0) // body of frame1 |
| .Mark(&frame1_rbp) // end of stack |
| .D64(0); |
| RegionFromSection(); |
| |
| raw_context.rip = 0x00007400c0000200ULL; |
| raw_context.rbp = frame0_rbp.Value(); |
| raw_context.rsp = stack_section.start().Value(); |
| |
| SetModuleSymbols(&module1, |
| // The youngest frame's function. |
| "FUNC 100 400 10 sasquatch\n"); |
| SetModuleSymbols(&module2, |
| // The calling frame's function. |
| "FUNC 100 400 10 yeti\n"); |
| |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); |
| StackwalkerAMD64 walker(&system_info, &raw_context, &stack_region, &modules, |
| &frame_symbolizer); |
| vector<const CodeModule*> modules_without_symbols; |
| vector<const CodeModule*> modules_with_corrupt_symbols; |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, |
| &modules_with_corrupt_symbols)); |
| ASSERT_EQ(0U, modules_without_symbols.size()); |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); |
| frames = call_stack.frames(); |
| ASSERT_EQ(2U, frames->size()); |
| |
| StackFrameAMD64 *frame0 = static_cast<StackFrameAMD64 *>(frames->at(0)); |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); |
| ASSERT_EQ(StackFrameAMD64::CONTEXT_VALID_ALL, frame0->context_validity); |
| EXPECT_EQ(frame0_rbp.Value(), frame0->context.rbp); |
| EXPECT_EQ("sasquatch", frame0->function_name); |
| EXPECT_EQ(0x00007400c0000100ULL, frame0->function_base); |
| |
| StackFrameAMD64 *frame1 = static_cast<StackFrameAMD64 *>(frames->at(1)); |
| EXPECT_EQ(StackFrame::FRAME_TRUST_FP, frame1->trust); |
| ASSERT_EQ((StackFrameAMD64::CONTEXT_VALID_RIP | |
| StackFrameAMD64::CONTEXT_VALID_RSP | |
| StackFrameAMD64::CONTEXT_VALID_RBP), |
| frame1->context_validity); |
| EXPECT_EQ(return_address, frame1->context.rip); |
| EXPECT_EQ(frame1_sp.Value(), frame1->context.rsp); |
| EXPECT_EQ(frame1_rbp.Value(), frame1->context.rbp); |
| EXPECT_EQ("yeti", frame1->function_name); |
| EXPECT_EQ(0x00007500b0000100ULL, frame1->function_base); |
| } |
| |
| struct CFIFixture: public StackwalkerAMD64Fixture { |
| CFIFixture() { |
| // Provide a bunch of STACK CFI records; we'll walk to the caller |
| // from every point in this series, expecting to find the same set |
| // of register values. |
| SetModuleSymbols(&module1, |
| // The youngest frame's function. |
| "FUNC 4000 1000 10 enchiridion\n" |
| // Initially, just a return address. |
| "STACK CFI INIT 4000 100 .cfa: $rsp 8 + .ra: .cfa 8 - ^\n" |
| // Push %rbx. |
| "STACK CFI 4001 .cfa: $rsp 16 + $rbx: .cfa 16 - ^\n" |
| // Save %r12 in %rbx. Weird, but permitted. |
| "STACK CFI 4002 $r12: $rbx\n" |
| // Allocate frame space, and save %r13. |
| "STACK CFI 4003 .cfa: $rsp 40 + $r13: .cfa 32 - ^\n" |
| // Put the return address in %r13. |
| "STACK CFI 4005 .ra: $r13\n" |
| // Save %rbp, and use it as a frame pointer. |
| "STACK CFI 4006 .cfa: $rbp 16 + $rbp: .cfa 24 - ^\n" |
| |
| // The calling function. |
| "FUNC 5000 1000 10 epictetus\n" |
| // Mark it as end of stack. |
| "STACK CFI INIT 5000 1000 .cfa: $rsp .ra 0\n"); |
| |
| // Provide some distinctive values for the caller's registers. |
| expected.rsp = 0x8000000080000000ULL; |
| expected.rip = 0x00007400c0005510ULL; |
| expected.rbp = 0x68995b1de4700266ULL; |
| expected.rbx = 0x5a5beeb38de23be8ULL; |
| expected.r12 = 0xed1b02e8cc0fc79cULL; |
| expected.r13 = 0x1d20ad8acacbe930ULL; |
| expected.r14 = 0xe94cffc2f7adaa28ULL; |
| expected.r15 = 0xb638d17d8da413b5ULL; |
| |
| // By default, registers are unchanged. |
| raw_context = expected; |
| } |
| |
| // Walk the stack, using stack_section as the contents of the stack |
| // and raw_context as the current register values. (Set |
| // raw_context.rsp to the stack's starting address.) Expect two |
| // stack frames; in the older frame, expect the callee-saves |
| // registers to have values matching those in 'expected'. |
| void CheckWalk() { |
| RegionFromSection(); |
| raw_context.rsp = stack_section.start().Value(); |
| |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); |
| StackwalkerAMD64 walker(&system_info, &raw_context, &stack_region, &modules, |
| &frame_symbolizer); |
| vector<const CodeModule*> modules_without_symbols; |
| vector<const CodeModule*> modules_with_corrupt_symbols; |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, |
| &modules_with_corrupt_symbols)); |
| ASSERT_EQ(0U, modules_without_symbols.size()); |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); |
| frames = call_stack.frames(); |
| ASSERT_EQ(2U, frames->size()); |
| |
| StackFrameAMD64 *frame0 = static_cast<StackFrameAMD64 *>(frames->at(0)); |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); |
| ASSERT_EQ(StackFrameAMD64::CONTEXT_VALID_ALL, frame0->context_validity); |
| EXPECT_EQ("enchiridion", frame0->function_name); |
| EXPECT_EQ(0x00007400c0004000ULL, frame0->function_base); |
| |
| StackFrameAMD64 *frame1 = static_cast<StackFrameAMD64 *>(frames->at(1)); |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CFI, frame1->trust); |
| ASSERT_EQ((StackFrameAMD64::CONTEXT_VALID_RIP | |
| StackFrameAMD64::CONTEXT_VALID_RSP | |
| StackFrameAMD64::CONTEXT_VALID_RBP | |
| StackFrameAMD64::CONTEXT_VALID_RBX | |
| StackFrameAMD64::CONTEXT_VALID_R12 | |
| StackFrameAMD64::CONTEXT_VALID_R13 | |
| StackFrameAMD64::CONTEXT_VALID_R14 | |
| StackFrameAMD64::CONTEXT_VALID_R15), |
| frame1->context_validity); |
| EXPECT_EQ(expected.rip, frame1->context.rip); |
| EXPECT_EQ(expected.rsp, frame1->context.rsp); |
| EXPECT_EQ(expected.rbp, frame1->context.rbp); |
| EXPECT_EQ(expected.rbx, frame1->context.rbx); |
| EXPECT_EQ(expected.r12, frame1->context.r12); |
| EXPECT_EQ(expected.r13, frame1->context.r13); |
| EXPECT_EQ(expected.r14, frame1->context.r14); |
| EXPECT_EQ(expected.r15, frame1->context.r15); |
| EXPECT_EQ("epictetus", frame1->function_name); |
| } |
| |
| // The values we expect to find for the caller's registers. |
| MDRawContextAMD64 expected; |
| }; |
| |
| class CFI: public CFIFixture, public Test { }; |
| |
| TEST_F(CFI, At4000) { |
| Label frame1_rsp = expected.rsp; |
| stack_section |
| .D64(0x00007400c0005510ULL) // return address |
| .Mark(&frame1_rsp); // This effectively sets stack_section.start(). |
| raw_context.rip = 0x00007400c0004000ULL; |
| CheckWalk(); |
| } |
| |
| TEST_F(CFI, At4001) { |
| Label frame1_rsp = expected.rsp; |
| stack_section |
| .D64(0x5a5beeb38de23be8ULL) // saved %rbx |
| .D64(0x00007400c0005510ULL) // return address |
| .Mark(&frame1_rsp); // This effectively sets stack_section.start(). |
| raw_context.rip = 0x00007400c0004001ULL; |
| raw_context.rbx = 0xbe0487d2f9eafe29ULL; // callee's (distinct) %rbx value |
| CheckWalk(); |
| } |
| |
| TEST_F(CFI, At4002) { |
| Label frame1_rsp = expected.rsp; |
| stack_section |
| .D64(0x5a5beeb38de23be8ULL) // saved %rbx |
| .D64(0x00007400c0005510ULL) // return address |
| .Mark(&frame1_rsp); // This effectively sets stack_section.start(). |
| raw_context.rip = 0x00007400c0004002ULL; |
| raw_context.rbx = 0xed1b02e8cc0fc79cULL; // saved %r12 |
| raw_context.r12 = 0xb0118de918a4bceaULL; // callee's (distinct) %r12 value |
| CheckWalk(); |
| } |
| |
| TEST_F(CFI, At4003) { |
| Label frame1_rsp = expected.rsp; |
| stack_section |
| .D64(0x0e023828dffd4d81ULL) // garbage |
| .D64(0x1d20ad8acacbe930ULL) // saved %r13 |
| .D64(0x319e68b49e3ace0fULL) // garbage |
| .D64(0x5a5beeb38de23be8ULL) // saved %rbx |
| .D64(0x00007400c0005510ULL) // return address |
| .Mark(&frame1_rsp); // This effectively sets stack_section.start(). |
| raw_context.rip = 0x00007400c0004003ULL; |
| raw_context.rbx = 0xed1b02e8cc0fc79cULL; // saved %r12 |
| raw_context.r12 = 0x89d04fa804c87a43ULL; // callee's (distinct) %r12 |
| raw_context.r13 = 0x5118e02cbdb24b03ULL; // callee's (distinct) %r13 |
| CheckWalk(); |
| } |
| |
| // The results here should be the same as those at module offset 0x4003. |
| TEST_F(CFI, At4004) { |
| Label frame1_rsp = expected.rsp; |
| stack_section |
| .D64(0x0e023828dffd4d81ULL) // garbage |
| .D64(0x1d20ad8acacbe930ULL) // saved %r13 |
| .D64(0x319e68b49e3ace0fULL) // garbage |
| .D64(0x5a5beeb38de23be8ULL) // saved %rbx |
| .D64(0x00007400c0005510ULL) // return address |
| .Mark(&frame1_rsp); // This effectively sets stack_section.start(). |
| raw_context.rip = 0x00007400c0004004ULL; |
| raw_context.rbx = 0xed1b02e8cc0fc79cULL; // saved %r12 |
| raw_context.r12 = 0x89d04fa804c87a43ULL; // callee's (distinct) %r12 |
| raw_context.r13 = 0x5118e02cbdb24b03ULL; // callee's (distinct) %r13 |
| CheckWalk(); |
| } |
| |
| TEST_F(CFI, At4005) { |
| Label frame1_rsp = expected.rsp; |
| stack_section |
| .D64(0x4b516dd035745953ULL) // garbage |
| .D64(0x1d20ad8acacbe930ULL) // saved %r13 |
| .D64(0xa6d445e16ae3d872ULL) // garbage |
| .D64(0x5a5beeb38de23be8ULL) // saved %rbx |
| .D64(0xaa95fa054aedfbaeULL) // garbage |
| .Mark(&frame1_rsp); // This effectively sets stack_section.start(). |
| raw_context.rip = 0x00007400c0004005ULL; |
| raw_context.rbx = 0xed1b02e8cc0fc79cULL; // saved %r12 |
| raw_context.r12 = 0x46b1b8868891b34aULL; // callee's %r12 |
| raw_context.r13 = 0x00007400c0005510ULL; // return address |
| CheckWalk(); |
| } |
| |
| TEST_F(CFI, At4006) { |
| Label frame0_rbp; |
| Label frame1_rsp = expected.rsp; |
| stack_section |
| .D64(0x043c6dfceb91aa34ULL) // garbage |
| .D64(0x1d20ad8acacbe930ULL) // saved %r13 |
| .D64(0x68995b1de4700266ULL) // saved %rbp |
| .Mark(&frame0_rbp) // frame pointer points here |
| .D64(0x5a5beeb38de23be8ULL) // saved %rbx |
| .D64(0xf015ee516ad89eabULL) // garbage |
| .Mark(&frame1_rsp); // This effectively sets stack_section.start(). |
| raw_context.rip = 0x00007400c0004006ULL; |
| raw_context.rbp = frame0_rbp.Value(); |
| raw_context.rbx = 0xed1b02e8cc0fc79cULL; // saved %r12 |
| raw_context.r12 = 0x26e007b341acfebdULL; // callee's %r12 |
| raw_context.r13 = 0x00007400c0005510ULL; // return address |
| CheckWalk(); |
| } |
