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Fix some apparently longstanding crash bugs in Stackwalker implementations when resolver is NULL.

Browse Source 
R=mark at http://breakpad.appspot.com/257001

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@761 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
ted.mielczarek 2011-01-24 19:59:09 +00:00
parent b904343e14
commit 281d52d944
7 changed files with 75 additions and 13 deletions
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3
src/processor/stackwalker.cc
View File

@ -120,7 +120,8 @@ bool Stackwalker::Walk(CallStack *stack) {
if (resolver_->ShouldDeleteMemoryBufferAfterLoadModule())
supplier_->FreeSymbolData(module);
}
resolver_->FillSourceLineInfo(frame.get());
if (resolver_)
resolver_->FillSourceLineInfo(frame.get());
}
}

2
src/processor/stackwalker_amd64.cc
View File

@ -184,7 +184,7 @@ StackFrame* StackwalkerAMD64::GetCallerFrame(const CallStack *stack) {
// If we have DWARF CFI information, use it.
scoped_ptr<CFIFrameInfo> cfi_frame_info(
resolver_->FindCFIFrameInfo(last_frame));
resolver_ ? resolver_->FindCFIFrameInfo(last_frame) : NULL);
if (cfi_frame_info.get())
new_frame.reset(GetCallerByCFIFrameInfo(frames, cfi_frame_info.get()));

28
src/processor/stackwalker_amd64_unittest.cc
View File

@ -130,6 +130,28 @@ class StackwalkerAMD64Fixture {
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 = 0x40000000c0000200ULL;
raw_context.rbp = 0x8000000080000000ULL;
StackwalkerAMD64 walker(&system_info, &raw_context, &stack_region, &modules,
NULL, NULL);
// This should succeed even without a resolver or supplier.
ASSERT_TRUE(walker.Walk(&call_stack));
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
@ -139,14 +161,14 @@ TEST_F(GetContextFrame, Simple) {
raw_context.rbp = 0x8000000080000000ULL;
StackwalkerAMD64 walker(&system_info, &raw_context, &stack_region, &modules,
&supplier, &resolver);
&supplier, &resolver);
ASSERT_TRUE(walker.Walk(&call_stack));
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_TRUE(memcmp(&raw_context, &frame->context, sizeof(raw_context)) == 0);
EXPECT_EQ(0, memcmp(&raw_context, &frame->context, sizeof(raw_context)));
}
class GetCallerFrame: public StackwalkerAMD64Fixture, public Test { };
@ -195,7 +217,7 @@ TEST_F(GetCallerFrame, ScanWithoutSymbols) {
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_TRUE(memcmp(&raw_context, &frame0->context, sizeof(raw_context)) == 0);
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);

4
src/processor/stackwalker_arm.cc
View File

@ -190,8 +190,8 @@ StackFrame* StackwalkerARM::GetCallerFrame(const CallStack *stack) {
scoped_ptr<StackFrameARM> frame;
// See if there is DWARF call frame information covering this address.
scoped_ptr<CFIFrameInfo> cfi_frame_info(resolver_
->FindCFIFrameInfo(last_frame));
scoped_ptr<CFIFrameInfo> cfi_frame_info(
resolver_ ? resolver_->FindCFIFrameInfo(last_frame) : NULL);
if (cfi_frame_info.get())
frame.reset(GetCallerByCFIFrameInfo(frames, cfi_frame_info.get()));

24
src/processor/stackwalker_arm_unittest.cc
View File

@ -130,6 +130,24 @@ class StackwalkerARMFixture {
const vector<StackFrame *> *frames;
};
class SanityCheck: public StackwalkerARMFixture, public Test { };
TEST_F(SanityCheck, NoResolver) {
// Since we have no call frame information, and all unwinding
// requires call frame information, the stack walk will end after
// the first frame.
StackwalkerARM walker(&system_info, &raw_context, &stack_region, &modules,
NULL, NULL);
// This should succeed even without a resolver or supplier.
ASSERT_TRUE(walker.Walk(&call_stack));
frames = call_stack.frames();
ASSERT_EQ(1U, frames->size());
StackFrameARM *frame = static_cast<StackFrameARM *>(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 GetContextFrame: public StackwalkerARMFixture, public Test { };
TEST_F(GetContextFrame, Simple) {
@ -144,7 +162,7 @@ TEST_F(GetContextFrame, Simple) {
StackFrameARM *frame = static_cast<StackFrameARM *>(frames->at(0));
// Check that the values from the original raw context made it
// through to the context in the stack frame.
EXPECT_TRUE(memcmp(&raw_context, &frame->context, sizeof(raw_context)) == 0);
EXPECT_EQ(0, memcmp(&raw_context, &frame->context, sizeof(raw_context)));
}
class GetCallerFrame: public StackwalkerARMFixture, public Test { };
@ -192,7 +210,7 @@ TEST_F(GetCallerFrame, ScanWithoutSymbols) {
StackFrameARM *frame0 = static_cast<StackFrameARM *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
ASSERT_EQ(StackFrameARM::CONTEXT_VALID_ALL, frame0->context_validity);
EXPECT_TRUE(memcmp(&raw_context, &frame0->context, sizeof(raw_context)) == 0);
EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context)));
StackFrameARM *frame1 = static_cast<StackFrameARM *>(frames->at(1));
EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust);
@ -255,7 +273,7 @@ TEST_F(GetCallerFrame, ScanWithFunctionSymbols) {
StackFrameARM *frame0 = static_cast<StackFrameARM *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
ASSERT_EQ(StackFrameARM::CONTEXT_VALID_ALL, frame0->context_validity);
EXPECT_TRUE(memcmp(&raw_context, &frame0->context, sizeof(raw_context)) == 0);
EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context)));
EXPECT_EQ("monotreme", frame0->function_name);
EXPECT_EQ(0x40000100, frame0->function_base);

5
src/processor/stackwalker_x86.cc
View File

@ -531,13 +531,14 @@ StackFrame *StackwalkerX86::GetCallerFrame(const CallStack *stack) {
// If the resolver has Windows stack walking information, use that.
WindowsFrameInfo *windows_frame_info
= resolver_->FindWindowsFrameInfo(last_frame);
= resolver_ ? resolver_->FindWindowsFrameInfo(last_frame) : NULL;
if (windows_frame_info)
new_frame.reset(GetCallerByWindowsFrameInfo(frames, windows_frame_info));
// If the resolver has DWARF CFI information, use that.
if (!new_frame.get()) {
CFIFrameInfo *cfi_frame_info = resolver_->FindCFIFrameInfo(last_frame);
CFIFrameInfo *cfi_frame_info =
resolver_ ? resolver_->FindCFIFrameInfo(last_frame) : NULL;
if (cfi_frame_info)
new_frame.reset(GetCallerByCFIFrameInfo(frames, cfi_frame_info));
}

22
src/processor/stackwalker_x86_unittest.cc
View File

@ -129,6 +129,26 @@ class StackwalkerX86Fixture {
const vector<StackFrame *> *frames;
};
class SanityCheck: public StackwalkerX86Fixture, public Test { };
TEST_F(SanityCheck, NoResolver) {
stack_section.start() = 0x80000000;
stack_section.D32(0).D32(0); // end-of-stack marker
RegionFromSection();
raw_context.eip = 0x40000200;
raw_context.ebp = 0x80000000;
StackwalkerX86 walker(&system_info, &raw_context, &stack_region, &modules,
NULL, NULL);
// This should succeed, even without a resolver or supplier.
ASSERT_TRUE(walker.Walk(&call_stack));
frames = call_stack.frames();
StackFrameX86 *frame = static_cast<StackFrameX86 *>(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 GetContextFrame: public StackwalkerX86Fixture, public Test { };
TEST_F(GetContextFrame, Simple) {
@ -145,7 +165,7 @@ TEST_F(GetContextFrame, Simple) {
StackFrameX86 *frame = static_cast<StackFrameX86 *>(frames->at(0));
// Check that the values from the original raw context made it
// through to the context in the stack frame.
EXPECT_TRUE(memcmp(&raw_context, &frame->context, sizeof(raw_context)) == 0);
EXPECT_EQ(0, memcmp(&raw_context, &frame->context, sizeof(raw_context)));
}
class GetCallerFrame: public StackwalkerX86Fixture, public Test { };